/* roulang page: index */
:root {
  --bg: #F5F6F7;
  --surface: #FFFFFF;
  --ink: #16181D;
  --ink-2: #4B5563;
  --line: #E3E6E8;
  --primary: #0EA5A4;
  --primary-deep: #0B7C7B;
  --primary-soft: rgba(14, 165, 164, .12);
  --accent: #FF7A1A;
  --accent-deep: #E05E00;
  --dark: #101318;
  --dark-line: rgba(255, 255, 255, .08);
  --radius-card: 16px;
  --radius-btn: 10px;
  --shadow-card: 0 1px 2px rgba(16, 20, 24, .06), 0 1px 3px rgba(16, 20, 24, .10);
  --shadow-hover: 0 12px 32px rgba(16, 20, 24, .12);
  --transition: all .2s ease;
  --container-w: 1200px;
  --gutter: 24px;
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
}

body {
  font-family: -apple-system, "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  background: var(--bg);
  color: var(--ink);
  font-size: 16px;
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
  text-align: left;
}

a {
  color: var(--primary);
  text-decoration: none;
  transition: var(--transition);
}

a:hover {
  color: var(--primary-deep);
}

img {
  max-width: 100%;
  height: auto;
  border-radius: 12px;
}

button, input, select, textarea {
  font-family: inherit;
  font-size: inherit;
  border: none;
  outline: none;
}

.mono, .version, .date, .sys-spec {
  font-family: ui-monospace, "SF Mono", "JetBrains Mono", Consolas, monospace;
}

.container {
  max-width: var(--container-w);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.dark-section {
  background: var(--dark);
  color: #fff;
  position: relative;
}

.dark-section::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 80px;
  background-image: linear-gradient(rgba(255,255,255,.06) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,.06) 1px, transparent 1px);
  background-size: 24px 24px;
  pointer-events: none;
}

.light-section {
  background: var(--surface);
}

.gray-section {
  background: var(--bg);
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--dark);
  border-bottom: 1px solid var(--dark-line);
  height: 64px;
  display: flex;
  align-items: center;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  width: 100%;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

.logo-mark {
  width: 32px;
  height: 32px;
  background: var(--primary);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

.logo-mark::before {
  content: "";
  width: 16px;
  height: 10px;
  border: 2px solid #fff;
  border-left: none;
  border-right: none;
  border-radius: 2px;
  position: relative;
}

.logo-mark::after {
  content: "";
  position: absolute;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: #fff;
  left: 6px;
  top: 6px;
  box-shadow: 12px 0 0 #fff, 0 12px 0 #fff, 12px 12px 0 #fff;
}

.logo-text {
  font-size: 20px;
  font-weight: 700;
  color: #fff;
  letter-spacing: .5px;
  white-space: nowrap;
}

.logo-text .logo-blue {
  color: var(--primary);
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-link {
  display: inline-block;
  padding: 8px 16px;
  color: rgba(255,255,255,.82);
  font-size: 15px;
  font-weight: 500;
  border-radius: 8px;
  transition: var(--transition);
  position: relative;
}

.nav-link:hover {
  color: #fff;
  opacity: .8;
}

.nav-link.active {
  color: #fff;
  font-weight: 600;
}

.nav-link.active::after {
  content: "";
  position: absolute;
  bottom: 2px;
  left: 14px;
  right: 14px;
  height: 3px;
  background: var(--accent);
  border-radius: 2px;
}

.header-cta {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}

.header-status {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(255,255,255,.10);
  color: #fff;
  font-size: 12px;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: 999px;
}

.header-status i {
  color: var(--accent);
  font-size: 10px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: var(--radius-btn);
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  border: none;
  line-height: 1.4;
}

.btn:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}

.btn-accent {
  background: var(--accent);
  color: #fff;
}

.btn-accent:hover {
  background: var(--accent-deep);
  color: #fff;
}

.btn-accent:active {
  transform: scale(.98);
}

.btn-primary {
  background: var(--primary);
  color: #fff;
}

.btn-primary:hover {
  background: var(--primary-deep);
  color: #fff;
}

.btn-outline {
  background: transparent;
  border: 1px solid var(--primary);
  color: var(--primary);
}

.btn-outline:hover {
  background: var(--primary-soft);
}

.btn-white-outline {
  background: rgba(255,255,255,.06);
  border: 1px solid rgba(255,255,255,.18);
  color: #fff;
}

.btn-white-outline:hover {
  background: rgba(255,255,255,.12);
  color: #fff;
}

.nav-download-btn {
  position: relative;
  padding: 10px 22px;
  font-size: 14px;
}

.nav-download-btn .version-badge {
  position: absolute;
  top: -6px;
  right: -6px;
  background: var(--dark);
  color: #fff;
  font-family: ui-monospace, Consolas, monospace;
  font-size: 11px;
  padding: 1px 6px;
  border-radius: 4px;
  border: 1px solid var(--dark-line);
  line-height: 1.4;
}

.mobile-toggle {
  display: none;
  background: none;
  border: none;
  color: #fff;
  font-size: 22px;
  cursor: pointer;
  padding: 8px;
}

/* Hero */
.hero {
  padding: 96px 0 88px;
  background: var(--dark);
  color: #fff;
  position: relative;
  overflow: hidden;
}

.hero::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 100px;
  background-image: linear-gradient(rgba(255,255,255,.05) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,.05) 1px, transparent 1px);
  background-size: 24px 24px;
  pointer-events: none;
}

.hero .container {
  position: relative;
  z-index: 2;
}

.hero-title {
  font-size: 42px;
  font-weight: 700;
  color: #fff;
  line-height: 1.3;
  margin-bottom: 16px;
  letter-spacing: .5px;
}

.hero-title .highlight {
  color: var(--primary);
}

.hero-subtitle {
  font-size: 17px;
  color: rgba(255,255,255,.70);
  margin-bottom: 28px;
  line-height: 1.7;
  max-width: 480px;
}

.hero-platforms {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 22px;
}

.hero-meta {
  display: flex;
  gap: 20px;
  font-size: 13px;
  color: rgba(255,255,255,.55);
  font-family: ui-monospace, "SF Mono", Consolas, monospace;
}

.hero-meta span {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.hero-meta i {
  color: var(--primary);
  font-size: 12px;
}

.hero-visual {
  position: relative;
  border-radius: 16px;
  overflow: hidden;
  border: 1px solid rgba(255,255,255,.12);
  box-shadow: 0 0 60px rgba(14,165,164,.15), 0 24px 64px rgba(0,0,0,.4);
  min-height: 300px;
  background-size: cover;
  background-position: center;
  background-color: #1a1d24;
}

.hero-visual::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(180deg, rgba(16,19,24,.1) 0%, rgba(16,19,24,.35) 100%);
  z-index: 1;
  border-radius: 16px;
}

.hero-visual-content {
  position: relative;
  z-index: 2;
  padding: 32px;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  height: 100%;
  min-height: 300px;
}

.hero-visual-content .visual-label {
  font-size: 13px;
  color: rgba(255,255,255,.6);
  margin-bottom: 6px;
  font-family: ui-monospace, Consolas, monospace;
}

.hero-visual-content .visual-title {
  font-size: 24px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 4px;
}

.hero-visual-content .visual-desc {
  font-size: 14px;
  color: rgba(255,255,255,.72);
}

/* Section common */
.section-pad {
  padding: 96px 0;
}

.section-head {
  margin-bottom: 48px;
  max-width: 640px;
}

.section-head.center {
  margin-left: auto;
  margin-right: auto;
  text-align: center;
}

.section-head h2 {
  font-size: 28px;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 12px;
  line-height: 1.35;
}

.section-head p {
  font-size: 16px;
  color: var(--ink-2);
  line-height: 1.7;
}

.section-head .section-tag {
  display: inline-block;
  background: var(--primary-soft);
  color: var(--primary-deep);
  font-size: 13px;
  font-weight: 600;
  padding: 4px 14px;
  border-radius: 999px;
  margin-bottom: 16px;
  letter-spacing: .5px;
}

.dark-section .section-head h2 {
  color: #fff;
}

.dark-section .section-head p {
  color: rgba(255,255,255,.65);
}

/* Orbit carousel */
.feature-carousel {
  position: relative;
  padding-top: 20px;
}

.orbit {
  outline: none;
}

.orbit-container {
  outline: none;
}

.orbit-slide img {
  width: 100%;
  border-radius: 16px;
  border: 1px solid var(--line);
  box-shadow: var(--shadow-card);
}

.orbit-caption {
  text-align: center;
  font-size: 14px;
  color: var(--ink-2);
  padding: 18px 0 30px;
}

.orbit-bullets {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-top: 8px;
}

.orbit-bullets .orbit-bullet {
  width: 8px;
  height: 8px;
  border-radius: 999px;
  background: var(--line);
  border: none;
  padding: 0;
  cursor: pointer;
  transition: var(--transition);
}

.orbit-bullets .orbit-bullet.is-active {
  width: 20px;
  background: var(--primary);
}

.orbit-previous, .orbit-next {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--surface);
  border: 1px solid var(--line);
  color: var(--ink);
  box-shadow: var(--shadow-card);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: var(--transition);
}

.orbit-previous:hover, .orbit-next:hover {
  background: var(--primary-soft);
  color: var(--primary-deep);
  border-color: var(--primary);
}

/* System requirements */
.sys-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.sys-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
  padding: 28px;
  box-shadow: var(--shadow-card);
  transition: var(--transition);
}

.sys-card:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-4px);
}

.sys-card-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 20px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--line);
}

.sys-icon {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  background: var(--primary-soft);
  color: var(--primary-deep);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  flex-shrink: 0;
}

.sys-card-header h3 {
  font-size: 18px;
  font-weight: 600;
  color: var(--ink);
}

.sys-card-header .sys-platform-count {
  font-size: 12px;
  color: var(--ink-2);
  font-family: ui-monospace, Consolas, monospace;
}

.sys-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 0;
  border-bottom: 1px solid var(--line);
  font-size: 14px;
}

.sys-row:last-child {
  border-bottom: none;
}

.sys-row .sys-name {
  color: var(--ink);
  font-weight: 500;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.sys-row .sys-spec {
  color: var(--ink-2);
  font-family: ui-monospace, Consolas, monospace;
  font-size: 13px;
  text-align: right;
}

.sys-note {
  margin-top: 16px;
  font-size: 12px;
  color: var(--ink-2);
  text-align: center;
}

/* Reviews */
.review-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.review-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
  padding: 28px;
  box-shadow: var(--shadow-card);
  transition: var(--transition);
}

.review-card:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-4px);
}

.review-card.large {
  grid-row: span 2;
  padding: 32px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  border-top: 4px solid var(--primary);
}

.review-stars {
  color: #F5B301;
  font-size: 15px;
  letter-spacing: 2px;
  margin-bottom: 16px;
}

.review-text {
  color: var(--ink);
  line-height: 1.9;
  font-size: 15px;
  margin-bottom: 20px;
}

.review-card.large .review-text {
  font-size: 16px;
  line-height: 2;
}

.review-user {
  display: flex;
  align-items: center;
  gap: 12px;
  border-top: 1px solid var(--line);
  padding-top: 18px;
}

.review-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--primary);
  color: #fff;
  font-weight: 700;
  font-size: 15px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.review-user-info .review-name {
  font-size: 14px;
  font-weight: 600;
  color: var(--ink);
}

.review-user-info .review-role {
  font-size: 12px;
  color: var(--ink-2);
}

/* Download zone */
.download-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.download-card {
  background: rgba(255,255,255,.06);
  border: 1px solid rgba(255,255,255,.10);
  border-radius: var(--radius-card);
  padding: 32px 16px;
  text-align: center;
  color: #fff;
  transition: var(--transition);
  cursor: pointer;
}

.download-card:hover {
  background: rgba(255,255,255,.12);
  transform: translateY(-4px);
}

.download-card.featured {
  background: var(--accent);
  border-color: var(--accent);
}

.download-card.featured:hover {
  background: var(--accent-deep);
}

.download-card .download-icon {
  font-size: 32px;
  margin-bottom: 12px;
  color: var(--primary);
}

.download-card.featured .download-icon {
  color: #fff;
}

.download-card .download-platform {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 6px;
}

.download-card .download-version {
  font-size: 12px;
  font-family: ui-monospace, Consolas, monospace;
  color: rgba(255,255,255,.60);
}

.download-card.featured .download-version {
  color: rgba(255,255,255,.85);
}

.download-meta {
  text-align: center;
  margin-top: 24px;
  font-size: 12px;
  font-family: ui-monospace, Consolas, monospace;
  color: rgba(255,255,255,.50);
  display: flex;
  justify-content: center;
  gap: 20px;
  flex-wrap: wrap;
}

.download-meta span {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.download-meta i {
  color: var(--primary);
}

/* News */
.news-list {
  max-width: 900px;
  margin: 0 auto;
}

.news-row {
  display: flex;
  align-items: center;
  gap: 24px;
  padding: 24px 0;
  border-bottom: 1px solid var(--line);
  transition: var(--transition);
}

.news-row:first-child {
  padding-top: 0;
}

.news-row:last-child {
  border-bottom: none;
}

.news-date {
  flex-shrink: 0;
  width: 72px;
  text-align: center;
  background: var(--bg);
  border-radius: 12px;
  padding: 10px 0;
}

.news-date .day {
  font-size: 26px;
  font-weight: 700;
  color: var(--ink);
  font-family: ui-monospace, "SF Mono", Consolas, monospace;
  display: block;
  line-height: 1.2;
}

.news-date .ym {
  font-size: 12px;
  color: var(--ink-2);
  font-family: ui-monospace, Consolas, monospace;
}

.news-body {
  flex: 1;
  min-width: 0;
}

.news-body .news-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 4px;
  line-height: 1.5;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.news-body .news-title a {
  color: inherit;
}

.news-body .news-title a:hover {
  color: var(--primary);
}

.news-body .news-summary {
  font-size: 14px;
  color: var(--ink-2);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.news-cat {
  flex-shrink: 0;
  background: var(--primary-soft);
  color: var(--primary-deep);
  font-size: 13px;
  font-weight: 500;
  padding: 4px 14px;
  border-radius: 6px;
  transition: var(--transition);
}

.news-cat:hover {
  background: var(--primary);
  color: #fff;
}

.news-empty {
  text-align: center;
  padding: 60px 20px;
  color: var(--ink-2);
}

.news-empty .empty-icon {
  display: inline-flex;
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background: var(--bg);
  color: var(--ink-2);
  font-size: 24px;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
}

.news-empty p {
  font-size: 15px;
}

.view-all-link {
  text-align: center;
  margin-top: 36px;
  font-size: 15px;
  font-weight: 500;
}

.view-all-link a {
  color: var(--primary);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.view-all-link a:hover {
  color: var(--accent);
}

.news-section-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  margin-bottom: 36px;
  flex-wrap: wrap;
  gap: 16px;
}

.news-section-head h2 {
  font-size: 28px;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 8px;
}

.news-section-head p {
  color: var(--ink-2);
  font-size: 15px;
}

.help-link-bar {
  margin-top: 40px;
  text-align: center;
  padding: 20px;
  background: var(--bg);
  border-radius: 12px;
  font-size: 14px;
  color: var(--ink-2);
}

.help-link-bar a {
  color: var(--primary);
  font-weight: 500;
  margin-left: 6px;
}

.help-link-bar a:hover {
  color: var(--accent);
}

/* FAQ */
.faq-list {
  max-width: 800px;
  margin: 0 auto;
}

.accordion-item {
  border-bottom: 1px solid var(--line);
  list-style: none;
}

.accordion-item:first-child {
  border-top: 1px solid var(--line);
}

.accordion-title {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 0;
  font-size: 16px;
  font-weight: 500;
  color: var(--ink);
  cursor: pointer;
  transition: var(--transition);
  position: relative;
  background: transparent;
}

.accordion-title:hover {
  color: var(--primary);
}

.accordion-title::after {
  content: "+";
  font-size: 22px;
  font-weight: 300;
  color: var(--ink-2);
  transition: var(--transition);
  margin-left: 16px;
  flex-shrink: 0;
}

.accordion-item.is-active .accordion-title {
  color: var(--primary);
}

.accordion-item.is-active .accordion-title::after {
  transform: rotate(45deg);
  color: var(--primary);
}

.accordion-content {
  overflow: hidden;
  padding: 0;
  max-height: 0;
  transition: max-height .3s ease;
}

.accordion-item.is-active .accordion-content {
  max-height: 800px;
  padding-bottom: 20px;
}

.accordion-content p {
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-2);
}

/* Final CTA */
.final-cta {
  padding: 96px 0;
  text-align: center;
  background: var(--dark);
  color: #fff;
  position: relative;
}

.final-cta::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 80px;
  background-image: linear-gradient(rgba(255,255,255,.05) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,.05) 1px, transparent 1px);
  background-size: 24px 24px;
}

.final-cta h2 {
  font-size: 32px;
  font-weight: 700;
  margin-bottom: 12px;
  color: #fff;
}

.final-cta p {
  font-size: 16px;
  color: rgba(255,255,255,.65);
  margin-bottom: 32px;
}

.final-cta .btn-accent {
  font-size: 18px;
  padding: 16px 48px;
  border-radius: 12px;
}

.final-cta .cta-meta {
  margin-top: 20px;
  font-size: 12px;
  font-family: ui-monospace, Consolas, monospace;
  color: rgba(255,255,255,.45);
}

/* Footer */
.site-footer {
  background: var(--dark);
  color: rgba(255,255,255,.65);
  padding-top: 64px;
  border-top: 1px solid var(--dark-line);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 48px;
  padding-bottom: 48px;
}

.footer-brand .logo {
  margin-bottom: 16px;
}

.footer-brand p {
  font-size: 14px;
  line-height: 1.7;
  color: rgba(255,255,255,.55);
  max-width: 260px;
}

.footer-col h4 {
  font-size: 15px;
  font-weight: 600;
  color: #fff;
  margin-bottom: 16px;
}

.footer-col ul {
  list-style: none;
  margin: 0;
}

.footer-col ul li {
  margin-bottom: 10px;
}

.footer-col ul li a {
  font-size: 14px;
  color: rgba(255,255,255,.55);
  transition: var(--transition);
}

.footer-col ul li a:hover {
  color: var(--primary);
}

.footer-contact p {
  font-size: 14px;
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.footer-contact i {
  color: var(--primary);
  width: 16px;
  font-size: 13px;
}

.footer-bottom {
  border-top: 1px solid var(--dark-line);
  padding: 20px 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 13px;
  color: rgba(255,255,255,.40);
}

.footer-bottom .footer-legal {
  font-family: ui-monospace, Consolas, monospace;
  font-size: 12px;
}

/* Responsive */
@media (max-width: 1024px) {
  .hero {
    padding: 72px 0 64px;
  }
  .hero-title {
    font-size: 36px;
  }
  .download-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .sys-grid {
    grid-template-columns: 1fr;
  }
  .review-grid {
    grid-template-columns: 1fr;
  }
  .review-card.large {
    grid-row: auto;
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }
  .main-nav {
    display: none;
  }
  .mobile-toggle {
    display: inline-block;
  }
  .header-status {
    display: none;
  }
  .main-nav.mobile-open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--dark);
    padding: 16px 24px;
    gap: 4px;
    border-bottom: 1px solid var(--dark-line);
  }
  .main-nav.mobile-open .nav-link {
    width: 100%;
    text-align: left;
    padding: 12px 16px;
  }
  .nav-link.active::after {
    display: none;
  }
}

@media (max-width: 640px) {
  .section-pad {
    padding: 64px 0;
  }
  .hero {
    padding: 56px 0 48px;
  }
  .hero-title {
    font-size: 26px;
  }
  .hero-subtitle {
    font-size: 15px;
  }
  .hero-platforms {
    gap: 8px;
  }
  .hero-platforms .btn {
    padding: 10px 14px;
    font-size: 13px;
    flex: 1;
  }
  .download-grid {
    grid-template-columns: 1fr;
  }
  .news-row {
    flex-direction: row;
    flex-wrap: wrap;
    gap: 12px;
  }
  .news-date {
    width: 60px;
    padding: 8px 0;
  }
  .news-date .day {
    font-size: 22px;
  }
  .news-body .news-title,
  .news-body .news-summary {
    white-space: normal;
  }
  .news-cat {
    margin-left: 84px;
  }
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }
  .section-head h2 {
    font-size: 22px;
  }
  .final-cta h2 {
    font-size: 26px;
  }
  .final-cta .btn-accent {
    font-size: 16px;
    padding: 14px 36px;
  }
}

/* Focus states */
.nav-link:focus-visible,
.logo:focus-visible,
.btn:focus-visible,
.orbit-bullet:focus-visible,
.accordion-title:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
  border-radius: 4px;
}

/* Accessibility */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

/* roulang page: category1 */
:root{
  --bg: #F5F6F7;
  --surface: #FFFFFF;
  --ink: #16181D;
  --ink-2: #4B5563;
  --line: #E3E6E8;
  --primary: #0EA5A4;
  --primary-deep: #0B7C7B;
  --primary-soft: rgba(14,165,164,.12);
  --accent: #FF7A1A;
  --accent-deep: #E05E00;
  --dark: #101318;
  --dark-line: rgba(255,255,255,.08);
  --radius-card: 16px;
  --radius-btn: 10px;
  --radius-tag: 999px;
  --shadow-card: 0 1px 2px rgba(16,20,24,.06), 0 1px 3px rgba(16,20,24,.10);
  --shadow-hover: 0 12px 32px rgba(16,20,24,.12);
  --space-section: 96px;
  --max-width: 1200px;
  --gutter: 24px;
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:-apple-system,"PingFang SC","Microsoft YaHei","Noto Sans SC",sans-serif;
  background:var(--bg);
  color:var(--ink);
  font-size:16px;
  line-height:1.8;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;height:auto;display:block}
a{color:var(--primary);text-decoration:none;transition:color .2s ease}
a:hover{color:var(--primary-deep)}
button{font-family:inherit;cursor:pointer}
.container{max-width:var(--max-width);margin:0 auto;padding:0 var(--gutter)}
.text-center{text-align:center}
.mono{font-family:ui-monospace,"SF Mono","JetBrains Mono",Consolas,monospace}

/* 导航 */
.main-nav{
  background:var(--dark);
  height:64px;
  border-bottom:1px solid var(--dark-line);
  position:sticky;
  top:0;
  z-index:100;
}
.nav-inner{
  max-width:var(--max-width);
  margin:0 auto;
  padding:0 var(--gutter);
  height:100%;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:24px;
}
.logo{
  display:flex;
  align-items:center;
  gap:10px;
  flex-shrink:0;
}
.logo-mark{
  width:32px;height:32px;
  background:var(--primary);
  border-radius:8px;
  position:relative;
  display:block;
}
.logo-mark::before{
  content:'';
  position:absolute;
  width:14px;height:2px;
  background:#fff;
  border-radius:2px;
  top:10px;left:9px;
}
.logo-mark::after{
  content:'';
  position:absolute;
  width:14px;height:2px;
  background:#fff;
  border-radius:2px;
  bottom:10px;left:9px;
}
.logo-mark::before{
  box-shadow:0 5px 0 rgba(255,255,255,.6);
}
.logo-text{
  font-size:20px;
  font-weight:700;
  color:#fff;
  letter-spacing:.01em;
}
.logo-blue{color:var(--primary)}
.nav-links{
  display:flex;
  align-items:center;
  gap:28px;
  list-style:none;
  margin:0;
}
.nav-links a{
  color:rgba(255,255,255,.8);
  font-size:15px;
  font-weight:500;
  padding:6px 2px;
  position:relative;
  transition:color .2s;
}
.nav-links a:hover{color:#fff}
.nav-links a.active{
  color:#fff;
}
.nav-links a.active::after{
  content:'';
  position:absolute;
  left:0;right:0;bottom:-2px;
  height:3px;
  background:var(--accent);
  border-radius:3px;
}
.nav-cta{
  display:flex;
  align-items:center;
  gap:16px;
}
.btn-download-nav{
  background:var(--accent);
  color:#fff;
  border:none;
  padding:10px 20px;
  border-radius:var(--radius-btn);
  font-size:14px;
  font-weight:600;
  display:flex;
  align-items:center;
  gap:8px;
  transition:background .2s, transform .2s;
  position:relative;
}
.btn-download-nav:hover{
  background:var(--accent-deep);
  color:#fff;
  transform:translateY(-1px);
}
.btn-download-nav:active{transform:scale(.98)}
.version-badge{
  position:absolute;
  top:-8px;right:-12px;
  background:#101318;
  color:#fff;
  font-size:11px;
  font-family:ui-monospace,"SF Mono",Consolas,monospace;
  padding:2px 8px;
  border-radius:4px;
  border:1px solid rgba(255,255,255,.2);
}
.status-tag{
  display:flex;
  align-items:center;
  gap:6px;
  font-size:12px;
  color:#FFD166;
  font-weight:600;
  letter-spacing:.04em;
}
.status-tag::before{
  content:'';
  width:8px;height:8px;
  border-radius:2px;
  background:#FFD166;
  animation:pulse 2s infinite;
}
@keyframes pulse{
  0%,100%{opacity:1}
  50%{opacity:.4}
}
.nav-toggle{
  display:none;
  background:none;
  border:none;
  color:#fff;
  font-size:24px;
  padding:8px;
}

/* 页头Banner */
.page-hero{
  background:var(--dark);
  position:relative;
  padding:72px 0 88px;
  border-bottom:1px solid var(--dark-line);
  overflow:hidden;
}
.page-hero::before{
  content:'';
  position:absolute;
  inset:0;
  background-image:
    linear-gradient(rgba(255,255,255,.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.06) 1px, transparent 1px);
  background-size:40px 40px;
  pointer-events:none;
}
.page-hero::after{
  content:'';
  position:absolute;
  top:0;right:0;
  width:50%;
  height:100%;
  background:url('/assets/images/backpic/back-1.png') center/cover no-repeat;
  opacity:.18;
  pointer-events:none;
}
.page-hero .container{
  position:relative;
  z-index:2;
}
.page-hero h1{
  color:#fff;
  font-size:42px;
  font-weight:700;
  line-height:1.25;
  margin-bottom:16px;
  letter-spacing:.01em;
}
.page-hero .hero-desc{
  color:rgba(255,255,255,.75);
  font-size:16px;
  max-width:600px;
  margin-bottom:32px;
  line-height:1.8;
}
.hero-chips{
  display:flex;
  flex-wrap:wrap;
  gap:10px;
}
.chip{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:6px 16px;
  border-radius:var(--radius-tag);
  background:rgba(255,255,255,.08);
  border:1px solid rgba(255,255,255,.15);
  color:rgba(255,255,255,.85);
  font-size:13px;
  font-weight:500;
}
.chip i{color:var(--primary);font-size:12px}

/* 下载步骤区 */
.section{padding:var(--space-section) 0}
.bg-white{background:var(--surface)}
.bg-gray{background:var(--bg)}
.section-header{
  text-align:center;
  max-width:720px;
  margin:0 auto 56px;
}
.section-header h2{
  font-size:28px;
  font-weight:700;
  color:var(--ink);
  line-height:1.3;
  margin-bottom:12px;
}
.section-header p{
  color:var(--ink-2);
  font-size:15px;
  line-height:1.8;
}
.eyebrow{
  display:inline-block;
  font-size:13px;
  font-weight:600;
  color:var(--primary);
  letter-spacing:.08em;
  text-transform:uppercase;
  margin-bottom:8px;
}
.steps-grid{
  display:grid;
  grid-template-columns:repeat(4,1fr);
  gap:24px;
  margin-bottom:48px;
}
.step-card{
  background:var(--surface);
  border:1px solid var(--line);
  border-radius:var(--radius-card);
  padding:28px 24px;
  position:relative;
  transition:transform .2s ease, box-shadow .2s ease;
}
.step-card:hover{
  transform:translateY(-4px);
  box-shadow:var(--shadow-hover);
}
.step-num{
  font-family:ui-monospace,"SF Mono",Consolas,monospace;
  font-size:14px;
  color:var(--primary);
  font-weight:700;
  display:block;
  margin-bottom:16px;
}
.step-card h3{
  font-size:17px;
  font-weight:600;
  margin-bottom:8px;
  color:var(--ink);
}
.step-card p{
  font-size:14px;
  color:var(--ink-2);
  line-height:1.7;
  margin-bottom:0;
}

/* 平台下载区 */
.platform-section{
  background:var(--dark);
  position:relative;
  padding:96px 0;
}
.platform-section::before{
  content:'';
  position:absolute;
  inset:0;
  background-image:
    linear-gradient(rgba(255,255,255,.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.05) 1px, transparent 1px);
  background-size:40px 40px;
  pointer-events:none;
}
.platform-section .container{position:relative;z-index:2}
.platform-section h2{
  color:#fff;
  font-size:28px;
  font-weight:700;
  text-align:center;
  margin-bottom:8px;
}
.platform-sub{
  color:rgba(255,255,255,.6);
  text-align:center;
  font-size:15px;
  margin-bottom:48px;
}
.platform-grid{
  display:grid;
  grid-template-columns:repeat(4,1fr);
  gap:20px;
}
.platform-card{
  background:rgba(255,255,255,.06);
  border:1px solid rgba(255,255,255,.1);
  border-radius:var(--radius-card);
  padding:28px 24px;
  text-align:center;
  transition:background .2s, transform .2s, border-color .2s;
}
.platform-card:hover{
  background:rgba(255,255,255,.12);
  transform:translateY(-4px);
  border-color:rgba(255,255,255,.2);
}
.platform-card.featured{
  background:var(--accent);
  border-color:var(--accent);
}
.platform-card.featured:hover{
  background:var(--accent-deep);
  border-color:var(--accent-deep);
}
.platform-icon{
  font-size:36px;
  color:#fff;
  margin-bottom:16px;
  display:block;
}
.platform-card h3{
  color:#fff;
  font-size:17px;
  font-weight:600;
  margin-bottom:4px;
}
.platform-card .p-version{
  color:rgba(255,255,255,.8);
  font-size:13px;
  margin-bottom:16px;
  font-family:ui-monospace,"SF Mono",Consolas,monospace;
}
.platform-card .btn-download{
  background:rgba(255,255,255,.15);
  color:#fff;
  border:1px solid rgba(255,255,255,.25);
  padding:10px 24px;
  border-radius:var(--radius-btn);
  font-size:14px;
  font-weight:600;
  display:inline-flex;
  align-items:center;
  gap:8px;
  transition:background .2s;
}
.platform-card .btn-download:hover{
  background:rgba(255,255,255,.25);
  color:#fff;
}
.platform-card.featured .btn-download{
  background:#fff;
  color:var(--accent-deep);
  border-color:#fff;
}
.platform-card.featured .btn-download:hover{
  background:rgba(255,255,255,.9);
}
.sha-line{
  text-align:center;
  margin-top:32px;
  color:rgba(255,255,255,.45);
  font-size:12px;
  font-family:ui-monospace,"SF Mono",Consolas,monospace;
  letter-spacing:.02em;
}

/* 环境检查 */
.req-grid{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:24px;
}
.req-card{
  background:var(--surface);
  border:1px solid var(--line);
  border-radius:var(--radius-card);
  padding:32px;
  transition:transform .2s, box-shadow .2s;
}
.req-card:hover{
  transform:translateY(-4px);
  box-shadow:var(--shadow-hover);
}
.req-card h3{
  font-size:18px;
  font-weight:600;
  margin-bottom:20px;
  display:flex;
  align-items:center;
  gap:10px;
}
.req-card h3 i{
  color:var(--primary);
  font-size:20px;
}
.req-item{
  display:flex;
  align-items:center;
  gap:12px;
  padding:12px 0;
  border-bottom:1px solid var(--line);
}
.req-item:last-child{border-bottom:none}
.req-item .req-icon{
  width:36px;height:36px;
  border-radius:10px;
  background:var(--primary-soft);
  display:flex;
  align-items:center;
  justify-content:center;
  color:var(--primary);
  font-size:16px;
  flex-shrink:0;
}
.req-item .req-info{
  flex:1;
}
.req-item .req-name{
  font-size:14px;
  font-weight:600;
  color:var(--ink);
}
.req-item .req-spec{
  font-size:13px;
  color:var(--ink-2);
  font-family:ui-monospace,"SF Mono",Consolas,monospace;
}

/* 常见问题 FAQ */
.faq-wrap{
  max-width:800px;
  margin:0 auto;
}
.faq-item{
  border-bottom:1px solid var(--line);
  padding:20px 0;
}
.faq-item summary{
  display:flex;
  justify-content:space-between;
  align-items:center;
  cursor:pointer;
  font-size:16px;
  font-weight:600;
  color:var(--ink);
  list-style:none;
  transition:color .2s;
  padding:4px 0;
}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary::after{
  content:'+';
  font-size:22px;
  font-weight:400;
  color:var(--primary);
  transition:transform .3s;
  flex-shrink:0;
  margin-left:16px;
}
.faq-item[open] summary{
  color:var(--primary);
}
.faq-item[open] summary::after{
  transform:rotate(45deg);
}
.faq-item .faq-answer{
  padding:16px 0 8px;
  color:var(--ink-2);
  font-size:15px;
  line-height:1.8;
}

/* CTA */
.cta-section{
  background:var(--dark);
  padding:96px 0;
  position:relative;
  overflow:hidden;
}
.cta-section::before{
  content:'';
  position:absolute;
  inset:0;
  background-image:
    linear-gradient(rgba(255,255,255,.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.05) 1px, transparent 1px);
  background-size:40px 40px;
  pointer-events:none;
}
.cta-inner{
  position:relative;
  z-index:2;
  text-align:center;
  max-width:640px;
  margin:0 auto;
}
.cta-inner h2{
  color:#fff;
  font-size:32px;
  font-weight:700;
  margin-bottom:12px;
}
.cta-inner p{
  color:rgba(255,255,255,.7);
  margin-bottom:32px;
  font-size:15px;
}
.btn-cta-primary{
  background:var(--accent);
  color:#fff;
  border:none;
  padding:16px 48px;
  border-radius:var(--radius-btn);
  font-size:16px;
  font-weight:600;
  display:inline-flex;
  align-items:center;
  gap:10px;
  transition:background .2s, transform .2s;
}
.btn-cta-primary:hover{
  background:var(--accent-deep);
  color:#fff;
  transform:translateY(-2px);
}
.cta-meta{
  margin-top:20px;
  font-family:ui-monospace,"SF Mono",Consolas,monospace;
  font-size:12px;
  color:rgba(255,255,255,.4);
}

/* 保障安全 */
.trust-grid{
  display:grid;
  grid-template-columns:repeat(3,1fr);
  gap:24px;
}
.trust-card{
  background:var(--surface);
  border:1px solid var(--line);
  border-radius:var(--radius-card);
  padding:32px 28px;
  text-align:center;
  transition:transform .2s, box-shadow .2s;
}
.trust-card:hover{
  transform:translateY(-4px);
  box-shadow:var(--shadow-hover);
}
.trust-card .trust-icon{
  width:52px;height:52px;
  margin:0 auto 20px;
  border-radius:14px;
  background:var(--primary-soft);
  display:flex;
  align-items:center;
  justify-content:center;
  color:var(--primary);
  font-size:22px;
}
.trust-card h3{
  font-size:16px;
  font-weight:600;
  margin-bottom:10px;
}
.trust-card p{
  font-size:14px;
  color:var(--ink-2);
  line-height:1.7;
  margin-bottom:0;
}

/* 页脚 */
.site-footer{
  background:var(--dark);
  padding:64px 0 0;
  border-top:1px solid var(--dark-line);
}
.footer-grid{
  display:grid;
  grid-template-columns:1.4fr .8fr .8fr 1fr;
  gap:40px;
  padding-bottom:40px;
}
.footer-brand p{
  color:rgba(255,255,255,.55);
  font-size:14px;
  line-height:1.7;
  margin-top:16px;
  max-width:280px;
}
.footer-col h4{
  color:#fff;
  font-size:15px;
  font-weight:600;
  margin-bottom:16px;
}
.footer-col ul{
  list-style:none;
  padding:0;
  margin:0;
}
.footer-col li{
  margin-bottom:10px;
}
.footer-col li a{
  color:rgba(255,255,255,.6);
  font-size:14px;
  transition:color .2s;
}
.footer-col li a:hover{
  color:var(--primary);
}
.footer-contact p{
  color:rgba(255,255,255,.6);
  font-size:14px;
  margin-bottom:10px;
  display:flex;
  align-items:center;
  gap:8px;
}
.footer-contact p i{
  color:var(--primary);
  width:16px;
}
.footer-bottom{
  border-top:1px solid var(--dark-line);
  padding:20px 0;
  display:flex;
  justify-content:space-between;
  align-items:center;
  flex-wrap:wrap;
  gap:12px;
}
.footer-bottom span{
  color:rgba(255,255,255,.45);
  font-size:13px;
}

/* 响应式 */
@media screen and (max-width:1024px){
  .steps-grid{grid-template-columns:repeat(2,1fr)}
  .platform-grid{grid-template-columns:repeat(2,1fr)}
  .trust-grid{grid-template-columns:repeat(2,1fr)}
  .req-grid{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr 1fr}
  .page-hero h1{font-size:32px}
}
@media screen and (max-width:768px){
  :root{--space-section:64px}
  .nav-links{
    display:none;
    position:absolute;
    top:64px;left:0;right:0;
    background:var(--dark);
    flex-direction:column;
    padding:20px var(--gutter);
    gap:12px;
    border-bottom:1px solid var(--dark-line);
  }
  .nav-links.open{display:flex}
  .nav-toggle{display:block}
  .status-tag{display:none}
  .btn-download-nav span{display:none}
  .page-hero{padding:56px 0 64px}
  .page-hero h1{font-size:26px}
  .platform-grid{grid-template-columns:1fr}
  .steps-grid{grid-template-columns:1fr}
  .trust-grid{grid-template-columns:1fr}
  .section-header h2{font-size:22px}
  .cta-inner h2{font-size:24px}
  .footer-grid{grid-template-columns:1fr;gap:32px}
  .footer-bottom{justify-content:center;text-align:center}
}
@media screen and (max-width:520px){
  .page-hero h1{font-size:23px}
  .hero-chips .chip{font-size:12px;padding:4px 12px}
  .req-card{padding:20px}
  .footer-grid{grid-template-columns:1fr}
}

/* roulang page: category2 */
:root {
      --bg: #F5F6F7;
      --surface: #FFFFFF;
      --ink: #16181D;
      --ink-2: #4B5563;
      --line: #E3E6E8;
      --primary: #0EA5A4;
      --primary-deep: #0B7C7B;
      --primary-soft: rgba(14, 165, 164, .12);
      --accent: #FF7A1A;
      --accent-deep: #E05E00;
      --dark: #101318;
      --dark-line: rgba(255, 255, 255, .08);
      --radius: 16px;
      --radius-sm: 10px;
      --radius-pill: 999px;
      --shadow-sm: 0 1px 2px rgba(16, 20, 24, .06), 0 1px 3px rgba(16, 20, 24, .10);
      --shadow-lg: 0 12px 32px rgba(16, 20, 24, .12);
      --space: 96px;
    }

    *,
    *::before,
    *::after {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

    html {
      scroll-behavior: smooth;
      scroll-padding-top: 80px;
    }

    body {
      font-family: -apple-system, "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
      font-size: 16px;
      line-height: 1.8;
      color: var(--ink);
      background: var(--bg);
      -webkit-font-smoothing: antialiased;
      text-align: left;
    }

    img {
      max-width: 100%;
      display: block;
      height: auto;
    }

    a {
      text-decoration: none;
      color: inherit;
      transition: color .2s ease, background .2s ease, box-shadow .2s ease;
    }

    ul {
      list-style: none;
    }

    button,
    input {
      font-family: inherit;
      font-size: inherit;
      border: none;
      background: none;
    }

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }

    .mono {
      font-family: ui-monospace, "SF Mono", "JetBrains Mono", Consolas, monospace;
    }

    /* ===== Buttons ===== */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      padding: 12px 24px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      font-size: 15px;
      line-height: 1.4;
      cursor: pointer;
      transition: background .2s ease, transform .2s ease, box-shadow .2s ease;
      border: 2px solid transparent;
      white-space: nowrap;
    }

    .btn:focus-visible {
      outline: 2px solid var(--primary);
      outline-offset: 2px;
    }

    .btn-accent {
      background: var(--accent);
      color: #fff;
    }

    .btn-accent:hover {
      background: var(--accent-deep);
      transform: translateY(-2px);
      box-shadow: 0 8px 20px rgba(255, 122, 26, .25);
    }

    .btn-accent:active {
      transform: scale(.98);
    }

    .btn-primary {
      background: var(--primary);
      color: #fff;
    }

    .btn-primary:hover {
      background: var(--primary-deep);
      transform: translateY(-2px);
    }

    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
    }

    .btn-outline:hover {
      background: var(--primary-soft);
    }

    .btn-outline-light {
      background: transparent;
      border: 2px solid rgba(255, 255, 255, .55);
      color: #fff;
    }

    .btn-outline-light:hover {
      background: rgba(255, 255, 255, .08);
      border-color: #fff;
    }

    .btn-lg {
      padding: 16px 36px;
      font-size: 17px;
    }

    .btn-sm {
      padding: 9px 18px;
      font-size: 14px;
    }

    /* ===== Header ===== */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 100;
      background: var(--dark);
      border-bottom: 1px solid var(--dark-line);
      height: 64px;
      display: flex;
      align-items: center;
    }

    .header-inner {
      display: flex;
      align-items: center;
      gap: 32px;
      width: 100%;
    }

    .logo {
      display: inline-flex;
      align-items: center;
      gap: 10px;
      flex-shrink: 0;
    }

    .logo-mark {
      width: 32px;
      height: 32px;
      border-radius: 8px;
      background: var(--primary);
      position: relative;
      flex-shrink: 0;
    }

    .logo-mark::before {
      content: "";
      position: absolute;
      top: 7px;
      left: 7px;
      width: 18px;
      height: 10px;
      border-left: 2px solid #fff;
      border-bottom: 2px solid #fff;
      border-radius: 0 0 0 4px;
    }

    .logo-mark::after {
      content: "";
      position: absolute;
      bottom: 7px;
      right: 7px;
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background: var(--accent);
    }

    .logo-text {
      font-size: 20px;
      font-weight: 700;
      letter-spacing: .02em;
      color: #fff;
    }

    .logo-blue {
      color: var(--primary);
    }

    .main-nav {
      display: flex;
      align-items: center;
      gap: 8px;
      margin-left: auto;
    }

    .nav-link {
      display: inline-block;
      padding: 8px 16px;
      font-size: 15px;
      font-weight: 500;
      color: rgba(255, 255, 255, .78);
      border-radius: 8px;
      border-bottom: 3px solid transparent;
      transition: color .2s, background .2s;
      line-height: 1.5;
    }

    .nav-link:hover {
      color: #fff;
      background: rgba(255, 255, 255, .06);
    }

    .nav-link.active {
      color: #fff;
      border-bottom-color: var(--accent);
    }

    .header-actions {
      display: flex;
      align-items: center;
      gap: 12px;
      flex-shrink: 0;
    }

    .version-badge {
      font-family: ui-monospace, "SF Mono", Consolas, monospace;
      font-size: 12px;
      background: rgba(255, 255, 255, .12);
      color: #fff;
      padding: 2px 8px;
      border-radius: 4px;
      line-height: 1.6;
    }

    .nav-toggle {
      display: none;
      width: 40px;
      height: 40px;
      border-radius: 8px;
      color: #fff;
      font-size: 20px;
      cursor: pointer;
      align-items: center;
      justify-content: center;
    }

    .nav-toggle:hover {
      background: rgba(255, 255, 255, .08);
    }

    /* ===== Page Hero ===== */
    .page-hero {
      background-color: var(--dark);
      background-image: url('/assets/images/backpic/back-1.png');
      background-size: cover;
      background-position: center;
      position: relative;
      padding: 88px 0 72px;
      border-bottom: 1px solid var(--dark-line);
    }

    .page-hero::before {
      content: "";
      position: absolute;
      inset: 0;
      background: rgba(16, 19, 24, .78);
    }

    .page-hero::after {
      content: "";
      position: absolute;
      left: 0;
      right: 0;
      bottom: 0;
      height: 120px;
      background-image: linear-gradient(rgba(255, 255, 255, .028) 1px, transparent 1px), linear-gradient(90deg, rgba(255, 255, 255, .028) 1px, transparent 1px);
      background-size: 32px 32px;
      pointer-events: none;
    }

    .page-hero .container {
      position: relative;
      z-index: 2;
    }

    .hero-content {
      max-width: 640px;
    }

    .hero-tag {
      display: inline-block;
      font-size: 13px;
      font-weight: 600;
      color: var(--primary);
      background: rgba(14, 165, 164, .16);
      border: 1px solid rgba(14, 165, 164, .4);
      padding: 4px 14px;
      border-radius: var(--radius-pill);
      margin-bottom: 20px;
      letter-spacing: .03em;
    }

    .page-hero h1 {
      font-size: 42px;
      font-weight: 700;
      color: #fff;
      line-height: 1.25;
      margin-bottom: 16px;
      letter-spacing: .01em;
    }

    .page-hero h1 .highlight {
      color: var(--primary);
    }

    .page-hero .hero-sub {
      font-size: 17px;
      line-height: 1.8;
      color: rgba(255, 255, 255, .72);
      margin-bottom: 28px;
      max-width: 480px;
    }

    .hero-btns {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 32px;
    }

    .hero-meta {
      font-family: ui-monospace, "SF Mono", Consolas, monospace;
      font-size: 13px;
      color: rgba(255, 255, 255, .5);
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
      border-top: 1px solid var(--dark-line);
      padding-top: 20px;
    }

    .hero-meta span {
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }

    .hero-meta i {
      color: var(--primary);
      font-size: 14px;
    }

    /* ===== Section base ===== */
    .section {
      padding: var(--space) 0;
    }

    .section-bg {
      background: var(--bg);
    }

    .section-white {
      background: var(--surface);
    }

    .section .section-header {
      margin-bottom: 48px;
    }

    .section .section-header h2 {
      font-size: 32px;
      font-weight: 700;
      color: var(--ink);
      line-height: 1.3;
      margin-bottom: 10px;
    }

    .section-header .section-desc {
      font-size: 15px;
      color: var(--ink-2);
      max-width: 560px;
      line-height: 1.7;
    }

    .section-header.center {
      text-align: center;
    }

    .section-header.center .section-desc {
      margin: 0 auto;
    }

    /* ===== Steps ===== */
    .steps-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }

    .step-card {
      background: var(--surface);
      border: 1px solid var(--line);
      border-radius: var(--radius);
      padding: 32px 24px 28px;
      position: relative;
      box-shadow: var(--shadow-sm);
      transition: transform .2s ease, box-shadow .2s ease;
    }

    .step-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-lg);
    }

    .step-num {
      font-family: ui-monospace, "SF Mono", Consolas, monospace;
      font-size: 44px;
      font-weight: 700;
      color: var(--primary-soft);
      position: absolute;
      top: 16px;
      right: 20px;
      line-height: 1;
    }

    .step-icon {
      width: 48px;
      height: 48px;
      border-radius: 12px;
      background: var(--primary-soft);
      color: var(--primary-deep);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 20px;
      margin-bottom: 20px;
    }

    .step-card h3 {
      font-size: 18px;
      font-weight: 600;
      color: var(--ink);
      margin-bottom: 10px;
      line-height: 1.4;
    }

    .step-card p {
      font-size: 14px;
      color: var(--ink-2);
      line-height: 1.75;
    }

    /* ===== Mixed Cards ===== */
    .mixed-grid {
      display: grid;
      grid-template-columns: 1.2fr 1fr;
      grid-template-rows: auto auto;
      gap: 24px;
    }

    .feature-card-large {
      grid-row: span 2;
      background: var(--surface);
      border: 1px solid var(--line);
      border-radius: var(--radius);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      transition: transform .2s ease, box-shadow .2s ease;
    }

    .feature-card-large:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-lg);
    }

    .feature-card-large .feature-img {
      height: 260px;
      overflow: hidden;
      position: relative;
    }

    .feature-card-large .feature-img::after {
      content: "";
      position: absolute;
      inset: 0;
      background: linear-gradient(to top, rgba(16, 19, 24, .15), transparent 60%);
    }

    .feature-card-large .feature-img img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform .3s ease;
    }

    .feature-card-large:hover .feature-img img {
      transform: scale(1.03);
    }

    .feature-body {
      padding: 28px 28px 32px;
      flex: 1;
      display: flex;
      flex-direction: column;
    }

    .feature-body .badge {
      align-self: flex-start;
      margin-bottom: 14px;
    }

    .feature-body h3 {
      font-size: 22px;
      font-weight: 600;
      color: var(--ink);
      margin-bottom: 12px;
      line-height: 1.35;
    }

    .feature-body p {
      font-size: 15px;
      color: var(--ink-2);
      line-height: 1.8;
      margin-bottom: 16px;
      flex-grow: 1;
    }

    .feature-link {
      font-size: 14px;
      font-weight: 600;
      color: var(--primary);
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }

    .feature-link:hover {
      color: var(--primary-deep);
      gap: 10px;
    }

    .feature-card-small {
      background: var(--surface);
      border: 1px solid var(--line);
      border-radius: var(--radius);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      transition: transform .2s ease, box-shadow .2s ease;
    }

    .feature-card-small:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-lg);
    }

    .feature-card-small .feature-img {
      height: 150px;
      overflow: hidden;
    }

    .feature-card-small .feature-img img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform .3s ease;
    }

    .feature-card-small:hover .feature-img img {
      transform: scale(1.05);
    }

    .feature-card-small .feature-body {
      padding: 20px 22px 24px;
      display: block;
    }

    .feature-card-small .feature-body h3 {
      font-size: 17px;
      margin-bottom: 8px;
    }

    .feature-card-small .feature-body p {
      font-size: 14px;
      margin-bottom: 12px;
      line-height: 1.7;
    }

    .badge {
      display: inline-block;
      font-size: 13px;
      font-weight: 600;
      background: var(--primary-soft);
      color: var(--primary-deep);
      padding: 4px 12px;
      border-radius: 6px;
      line-height: 1.5;
    }

    .badge-hot {
      background: var(--accent);
      color: #fff;
      border-radius: var(--radius-pill);
      font-size: 12px;
      padding: 3px 10px;
    }

    /* ===== Scenes ===== */
    .scenes-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .scene-card {
      background: var(--surface);
      border: 1px solid var(--line);
      border-radius: var(--radius);
      padding: 32px 28px;
      box-shadow: var(--shadow-sm);
      position: relative;
      overflow: hidden;
      transition: transform .2s ease, box-shadow .2s ease;
    }

    .scene-card::before {
      content: "";
      position: absolute;
      top: 0;
      left: 0;
      right: 0;
      height: 4px;
      background: var(--primary);
      border-radius: var(--radius) var(--radius) 0 0;
    }

    .scene-card:nth-child(2)::before {
      background: var(--accent);
    }

    .scene-card:nth-child(3)::before {
      background: var(--primary);
    }

    .scene-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-lg);
    }

    .scene-icon {
      width: 52px;
      height: 52px;
      border-radius: 14px;
      background: var(--primary-soft);
      color: var(--primary-deep);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 22px;
      margin-bottom: 18px;
    }

    .scene-card:nth-child(2) .scene-icon {
      background: rgba(255, 122, 26, .12);
      color: var(--accent);
    }

    .scene-card h3 {
      font-size: 18px;
      font-weight: 600;
      color: var(--ink);
      margin-bottom: 12px;
      line-height: 1.4;
    }

    .scene-card p {
      font-size: 14px;
      color: var(--ink-2);
      line-height: 1.8;
    }

    .scene-card ul {
      margin-top: 12px;
      padding-top: 12px;
      border-top: 1px solid var(--line);
    }

    .scene-card ul li {
      font-size: 13px;
      color: var(--ink-2);
      padding: 4px 0;
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .scene-card ul li i {
      font-size: 12px;
      color: var(--primary);
    }

    /* ===== Tips + Data ===== */
    .tips-wrap {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
    }

    .data-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 20px;
    }

    .data-card {
      background: var(--surface);
      border: 1px solid var(--line);
      border-radius: var(--radius);
      padding: 28px 24px;
      box-shadow: var(--shadow-sm);
      text-align: center;
      transition: transform .2s ease, box-shadow .2s ease;
    }

    .data-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-lg);
    }

    .data-num {
      font-family: ui-monospace, "SF Mono", Consolas, monospace;
      font-size: 36px;
      font-weight: 700;
      color: var(--primary);
      line-height: 1.2;
    }

    .data-card p {
      font-size: 13px;
      color: var(--ink-2);
      margin-top: 6px;
    }

    .tips-list {
      margin-top: 8px;
    }

    .tips-list li {
      display: flex;
      gap: 14px;
      padding: 16px 0;
      border-bottom: 1px solid var(--line);
      align-items: flex-start;
    }

    .tips-list li:last-child {
      border-bottom: none;
    }

    .tips-num {
      width: 28px;
      height: 28px;
      border-radius: 50%;
      background: var(--primary-soft);
      color: var(--primary-deep);
      font-family: ui-monospace, Consolas, monospace;
      font-size: 14px;
      font-weight: 600;
      display: flex;
      align-items: center;
      justify-content: center;
      flex-shrink: 0;
      margin-top: 2px;
    }

    .tips-list h4 {
      font-size: 15px;
      font-weight: 600;
      color: var(--ink);
      margin-bottom: 4px;
      line-height: 1.4;
    }

    .tips-list p {
      font-size: 14px;
      color: var(--ink-2);
      line-height: 1.7;
    }

    /* ===== FAQ ===== */
    .faq-wrap {
      max-width: 760px;
      margin: 0 auto;
    }

    .accordion {
      background: var(--surface);
      border: 1px solid var(--line);
      border-radius: var(--radius);
      box-shadow: var(--shadow-sm);
      padding: 8px 32px;
    }

    .accordion-item {
      border-bottom: 1px solid var(--line);
    }

    .accordion-item:last-child {
      border-bottom: none;
    }

    .accordion-title {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 20px 0;
      font-size: 16px;
      font-weight: 600;
      color: var(--ink);
      cursor: pointer;
      position: relative;
      transition: color .2s ease;
    }

    .accordion-title:hover {
      color: var(--primary);
    }

    .accordion-title::after {
      content: "\f067";
      font-family: "Font Awesome 6 Free";
      font-weight: 900;
      font-size: 14px;
      color: var(--ink-2);
      transition: transform .2s ease, color .2s ease;
      flex-shrink: 0;
      margin-left: 16px;
    }

    .accordion-item.is-active .accordion-title {
      color: var(--primary);
    }

    .accordion-item.is-active .accordion-title::after {
      content: "\f068";
      color: var(--primary);
      transform: rotate(180deg);
    }

    .accordion-content {
      padding: 0 0 20px;
      font-size: 15px;
      color: var(--ink-2);
      line-height: 1.8;
      max-width: 96%;
    }

    /* ===== CTA ===== */
    .cta-section {
      background-color: var(--dark);
      background-image: url('/assets/images/backpic/back-2.webp');
      background-size: cover;
      background-position: center;
      position: relative;
      padding: 96px 0;
      text-align: center;
    }

    .cta-section::before {
      content: "";
      position: absolute;
      inset: 0;
      background: rgba(16, 19, 24, .85);
    }

    .cta-section::after {
      content: "";
      position: absolute;
      left: 0;
      right: 0;
      bottom: 0;
      height: 90px;
      background-image: linear-gradient(rgba(255, 255, 255, .03) 1px, transparent 1px), linear-gradient(90deg, rgba(255, 255, 255, .03) 1px, transparent 1px);
      background-size: 36px 36px;
      pointer-events: none;
    }

    .cta-section .container {
      position: relative;
      z-index: 2;
    }

    .cta-section h2 {
      font-size: 34px;
      font-weight: 700;
      color: #fff;
      margin-bottom: 12px;
      line-height: 1.3;
    }

    .cta-section .cta-desc {
      font-size: 16px;
      color: rgba(255, 255, 255, .72);
      max-width: 560px;
      margin: 0 auto 32px;
    }

    .cta-version {
      font-family: ui-monospace, "SF Mono", Consolas, monospace;
      font-size: 12px;
      color: rgba(255, 255, 255, .45);
      margin-top: 20px;
    }

    /* ===== Footer ===== */
    .site-footer {
      background: var(--dark);
      border-top: 1px solid var(--dark-line);
      padding: 64px 0 0;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.2fr;
      gap: 40px;
      padding-bottom: 48px;
      border-bottom: 1px solid var(--dark-line);
    }

    .footer-brand .logo-text {
      color: #fff;
    }

    .footer-brand p {
      font-size: 14px;
      color: rgba(255, 255, 255, .55);
      line-height: 1.8;
      margin-top: 16px;
      max-width: 280px;
    }

    .footer-col h4 {
      font-size: 15px;
      font-weight: 600;
      color: #fff;
      margin-bottom: 16px;
    }

    .footer-col ul li {
      margin-bottom: 10px;
    }

    .footer-col ul a {
      font-size: 14px;
      color: rgba(255, 255, 255, .55);
      transition: color .2s ease;
    }

    .footer-col ul a:hover {
      color: var(--primary);
    }

    .footer-contact p {
      font-size: 14px;
      color: rgba(255, 255, 255, .55);
      margin-bottom: 10px;
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .footer-contact i {
      color: var(--primary);
      width: 16px;
      text-align: center;
    }

    .footer-bottom {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 24px 0;
      font-size: 13px;
      color: rgba(255, 255, 255, .38);
      flex-wrap: wrap;
      gap: 8px;
    }

    /* ===== Responsive ===== */
    @media (max-width: 1024px) {
      .steps-grid {
        grid-template-columns: repeat(2, 1fr);
      }

      .scenes-grid {
        grid-template-columns: repeat(2, 1fr);
      }

      .footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: 32px;
      }

      .header-inner {
        gap: 16px;
      }

      .nav-link {
        padding: 8px 10px;
        font-size: 14px;
      }
    }

    @media (max-width: 840px) {
      :root {
        --space: 64px;
      }

      .nav-toggle {
        display: flex;
      }

      .main-nav {
        position: fixed;
        top: 64px;
        left: 0;
        right: 0;
        background: var(--dark);
        flex-direction: column;
        gap: 4px;
        padding: 16px 24px 24px;
        box-shadow: 0 8px 32px rgba(0, 0, 0, .4);
        transform: translateY(-120%);
        opacity: 0;
        pointer-events: none;
        transition: transform .25s ease, opacity .25s ease;
        border-bottom: 1px solid var(--dark-line);
      }

      .main-nav.open {
        transform: translateY(0);
        opacity: 1;
        pointer-events: auto;
      }

      .nav-link {
        display: block;
        width: 100%;
        text-align: left;
        padding: 12px 16px;
        border-radius: 8px;
        border-bottom: none;
      }

      .nav-link.active {
        background: var(--primary-soft);
        color: var(--primary);
        border-bottom: none;
      }

      .header-actions .btn-sm {
        display: none;
      }

      .version-badge {
        display: none;
      }

      .mixed-grid {
        grid-template-columns: 1fr;
      }

      .feature-card-large {
        grid-row: auto;
      }

      .feature-card-large .feature-img {
        height: 200px;
      }

      .tips-wrap {
        grid-template-columns: 1fr;
        gap: 40px;
      }

      .cta-section h2 {
        font-size: 28px;
      }

      .page-hero h1 {
        font-size: 32px;
      }
    }

    @media (max-width: 640px) {
      .steps-grid {
        grid-template-columns: 1fr;
      }

      .scenes-grid {
        grid-template-columns: 1fr;
      }

      .data-grid {
        grid-template-columns: 1fr;
      }

      .footer-grid {
        grid-template-columns: 1fr;
        gap: 28px;
      }

      .hero-btns .btn {
        width: 100%;
      }

      .page-hero h1 {
        font-size: 27px;
      }

      .page-hero .hero-sub {
        font-size: 15px;
      }

      .section h2 {
        font-size: 24px !important;
      }

      .accordion {
        padding: 8px 20px;
      }

      .accordion-title {
        font-size: 15px;
        line-height: 1.5;
      }

      .cta-section h2 {
        font-size: 24px;
      }

      .footer-bottom {
        flex-direction: column;
        text-align: center;
        gap: 6px;
      }
    }

    @media (max-width: 520px) {
      .container {
        padding: 0 16px;
      }

      .header-inner {
        gap: 12px;
      }

      .logo-text {
        font-size: 18px;
      }

      .hero-meta {
        flex-direction: column;
        gap: 8px;
      }

      .step-card {
        padding: 24px 20px;
      }
    }

/* roulang page: article */
:root {
        --bg: #F5F6F7;
        --surface: #FFFFFF;
        --ink: #16181D;
        --ink-2: #4B5563;
        --line: #E3E6E8;
        --primary: #0EA5A4;
        --primary-deep: #0B7C7B;
        --primary-soft: rgba(14,165,164,.12);
        --accent: #FF7A1A;
        --accent-deep: #E05E00;
        --dark: #101318;
        --dark-line: rgba(255,255,255,.08);
        --radius-card: 16px;
        --radius-btn: 10px;
        --shadow-card: 0 1px 2px rgba(16,20,24,.06), 0 1px 3px rgba(16,20,24,.10);
        --shadow-hover: 0 12px 32px rgba(16,20,24,.12);
        --font-main: -apple-system, "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
        --font-mono: ui-monospace, "SF Mono", "JetBrains Mono", Consolas, monospace;
        --gap-section: 96px;
    }

    *, *::before, *::after {
        box-sizing: border-box;
        margin: 0;
        padding: 0;
    }

    html {
        scroll-behavior: smooth;
    }

    body {
        font-family: var(--font-main);
        font-size: 16px;
        line-height: 1.75;
        color: var(--ink);
        background: var(--bg);
        -webkit-font-smoothing: antialiased;
    }

    img {
        max-width: 100%;
        height: auto;
        display: block;
    }

    a {
        color: inherit;
        text-decoration: none;
        transition: color .2s;
    }

    button {
        font-family: inherit;
        cursor: pointer;
        border: none;
        background: none;
    }

    ul, ol {
        list-style: none;
    }

    [id] {
        scroll-margin-top: 80px;
    }

    .container {
        max-width: 1200px;
        margin: 0 auto;
        padding: 0 24px;
    }

    .text-center {
        text-align: center;
    }

    .mono {
        font-family: var(--font-mono);
    }

    .site-header {
        background: var(--dark);
        border-bottom: 1px solid var(--dark-line);
        position: sticky;
        top: 0;
        z-index: 100;
        height: 64px;
    }

    .header-inner {
        display: flex;
        align-items: center;
        justify-content: space-between;
        height: 100%;
        max-width: 1200px;
        margin: 0 auto;
        padding: 0 24px;
        position: relative;
    }

    .logo {
        display: flex;
        align-items: center;
        gap: 10px;
        flex-shrink: 0;
    }

    .logo-mark {
        width: 32px;
        height: 32px;
        display: inline-block;
        flex-shrink: 0;
        background: var(--primary);
        border-radius: 8px;
        position: relative;
    }

    .logo-mark::before {
        content: '';
        position: absolute;
        left: 50%;
        top: 50%;
        width: 8px;
        height: 8px;
        border: 2px solid #fff;
        border-radius: 3px;
        background: var(--accent);
        transform: translate(-50%, -50%);
        z-index: 1;
    }

    .logo-mark::after {
        content: '';
        position: absolute;
        left: 50%;
        top: 50%;
        width: 18px;
        height: 2px;
        background: #fff;
        transform: translate(-50%, -50%) rotate(45deg);
        border-radius: 2px;
        opacity: .9;
    }

    .logo-text {
        font-size: 20px;
        font-weight: 700;
        color: #fff;
        letter-spacing: .5px;
        white-space: nowrap;
    }

    .logo-blue {
        color: var(--primary);
    }

    .main-nav {
        display: flex;
        align-items: center;
        gap: 28px;
    }

    .nav-link {
        color: rgba(255, 255, 255, .78);
        font-size: 15px;
        font-weight: 500;
        padding: 8px 2px;
        position: relative;
        transition: color .2s;
        white-space: nowrap;
    }

    .nav-link:hover {
        color: #fff;
    }

    .nav-link.active {
        color: #fff;
    }

    .nav-link.active::after {
        content: '';
        position: absolute;
        left: 0;
        bottom: 0;
        width: 100%;
        height: 3px;
        background: var(--accent);
        border-radius: 2px;
    }

    .nav-cta {
        margin-left: 12px;
    }

    .nav-toggle {
        display: none;
        width: 40px;
        height: 40px;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: 5px;
        border-radius: 8px;
    }

    .nav-toggle span {
        display: block;
        width: 20px;
        height: 2px;
        background: #fff;
        border-radius: 2px;
        transition: all .3s;
    }

    .nav-toggle.open span:nth-child(1) {
        transform: translateY(7px) rotate(45deg);
    }

    .nav-toggle.open span:nth-child(2) {
        opacity: 0;
    }

    .nav-toggle.open span:nth-child(3) {
        transform: translateY(-7px) rotate(-45deg);
    }

    .btn {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        gap: 8px;
        border-radius: var(--radius-btn);
        font-weight: 600;
        font-size: 15px;
        line-height: 1;
        padding: 12px 20px;
        border: none;
        transition: all .2s;
        cursor: pointer;
    }

    .btn:hover {
        transform: translateY(-2px);
        box-shadow: var(--shadow-hover);
    }

    .btn:active {
        transform: scale(.98);
        box-shadow: none;
    }

    .btn:focus-visible {
        outline: 2px solid var(--primary);
        outline-offset: 2px;
    }

    .btn-accent {
        background: var(--accent);
        color: #fff;
    }

    .btn-accent:hover {
        background: var(--accent-deep);
    }

    .btn-primary {
        background: var(--primary);
        color: #fff;
    }

    .btn-primary:hover {
        background: var(--primary-deep);
    }

    .btn-outline {
        background: transparent;
        border: 1px solid var(--primary);
        color: var(--primary);
    }

    .btn-outline:hover {
        background: var(--primary-soft);
        border-color: var(--primary-deep);
        color: var(--primary-deep);
    }

    .btn-lg {
        padding: 14px 32px;
        font-size: 17px;
        border-radius: 12px;
    }

    .btn-sm {
        padding: 8px 16px;
        font-size: 14px;
    }

    .version-badge {
        font-family: var(--font-mono);
        font-size: 11px;
        background: rgba(255, 255, 255, .14);
        color: #fff;
        border-radius: 4px;
        padding: 2px 6px;
        font-weight: 400;
        margin-left: 2px;
    }

    .article-hero {
        background: var(--bg);
        padding: 64px 0 48px;
        border-bottom: 1px solid var(--line);
    }

    .breadcrumb {
        display: flex;
        align-items: center;
        gap: 8px;
        font-size: 14px;
        color: var(--ink-2);
        margin-bottom: 24px;
        flex-wrap: wrap;
    }

    .breadcrumb a {
        color: var(--primary);
        font-weight: 500;
    }

    .breadcrumb a:hover {
        color: var(--primary-deep);
    }

    .breadcrumb .sep {
        color: var(--line);
        font-weight: 300;
    }

    .breadcrumb .current {
        max-width: 340px;
        white-space: nowrap;
        overflow: hidden;
        text-overflow: ellipsis;
        color: var(--ink-2);
    }

    .article-hero h1 {
        font-size: 42px;
        font-weight: 700;
        line-height: 1.3;
        margin-bottom: 20px;
        max-width: 900px;
        letter-spacing: -.01em;
    }

    .article-meta {
        display: flex;
        align-items: center;
        gap: 20px;
        font-size: 14px;
        color: var(--ink-2);
        flex-wrap: wrap;
    }

    .article-meta i {
        margin-right: 5px;
        color: var(--primary);
        width: 16px;
        text-align: center;
    }

    .badge-category {
        background: var(--primary-soft);
        color: var(--primary-deep);
        font-size: 13px;
        font-weight: 600;
        padding: 4px 12px;
        border-radius: 6px;
        display: inline-flex;
        align-items: center;
    }

    .article-main {
        background: var(--surface);
        padding: 56px 0 72px;
    }

    .article-main-container {
        max-width: 1200px;
        padding: 0 24px;
    }

    .article-body-column {
        max-width: 720px;
        margin: 0 auto;
    }

    .article-body {
        font-size: 17px;
        line-height: 1.8;
        letter-spacing: .02em;
        text-align: left;
        color: var(--ink);
    }

    .article-body p {
        margin-bottom: 24px;
    }

    .article-body h2 {
        font-size: 28px;
        font-weight: 700;
        margin: 48px 0 20px;
        line-height: 1.4;
    }

    .article-body h3 {
        font-size: 22px;
        font-weight: 700;
        margin: 40px 0 16px;
        line-height: 1.4;
    }

    .article-body h4 {
        font-size: 18px;
        font-weight: 600;
        margin: 28px 0 14px;
    }

    .article-body ul,
    .article-body ol {
        margin: 0 0 24px 24px;
    }

    .article-body li {
        margin-bottom: 8px;
    }

    .article-body blockquote {
        background: var(--bg);
        border-left: 4px solid var(--primary);
        padding: 16px 20px;
        border-radius: 0 8px 8px 0;
        margin: 24px 0;
        color: var(--ink-2);
        font-size: 16px;
    }

    .article-body code {
        font-family: var(--font-mono);
        font-size: .9em;
        background: var(--bg);
        color: var(--primary-deep);
        border-radius: 6px;
        padding: 2px 8px;
    }

    .article-body pre {
        background: var(--dark);
        color: #fff;
        padding: 20px;
        border-radius: 12px;
        overflow-x: auto;
        margin: 24px 0;
        font-family: var(--font-mono);
        font-size: 14px;
        line-height: 1.7;
    }

    .article-body pre code {
        background: transparent;
        color: #fff;
        padding: 0;
    }

    .article-body img {
        width: 100%;
        border-radius: 12px;
        margin: 24px 0;
    }

    .article-body table {
        width: 100%;
        border-collapse: collapse;
        margin: 24px 0;
        font-size: 15px;
    }

    .article-body th,
    .article-body td {
        border: 1px solid var(--line);
        padding: 12px 16px;
        text-align: left;
    }

    .article-body th {
        background: var(--bg);
        font-weight: 600;
    }

    .article-body a {
        color: var(--primary);
        border-bottom: 1px solid var(--primary-soft);
    }

    .article-body a:hover {
        color: var(--primary-deep);
        border-color: var(--primary-deep);
    }

    .article-cta {
        margin-top: 48px;
        background: var(--primary-soft);
        border-radius: var(--radius-card);
        padding: 20px 28px;
        display: flex;
        align-items: center;
        justify-content: space-between;
        gap: 16px;
        flex-wrap: wrap;
        border: 1px solid rgba(14, 165, 164, .18);
    }

    .article-cta p {
        font-size: 15px;
        color: var(--ink);
        font-weight: 500;
    }

    .article-tags {
        display: flex;
        flex-wrap: wrap;
        gap: 10px;
        margin-top: 28px;
    }

    .article-tags .tag {
        font-size: 13px;
        padding: 6px 14px;
        background: var(--primary-soft);
        color: var(--primary-deep);
        border-radius: 999px;
        font-weight: 500;
        transition: background .2s;
    }

    .article-tags .tag:hover {
        background: rgba(14, 165, 164, .22);
    }

    .not-found {
        text-align: center;
        padding: 80px 24px;
        color: var(--ink-2);
    }

    .not-found i {
        font-size: 52px;
        color: var(--line);
        margin-bottom: 18px;
        display: block;
    }

    .not-found p {
        font-size: 18px;
        margin-bottom: 24px;
        color: var(--ink);
    }

    .related-section {
        background: var(--bg);
        padding: var(--gap-section) 0;
    }

    .section-head {
        text-align: center;
        margin-bottom: 48px;
    }

    .section-head h2 {
        font-size: 28px;
        font-weight: 700;
        margin-bottom: 10px;
        letter-spacing: -.01em;
    }

    .section-head p {
        color: var(--ink-2);
        font-size: 15px;
    }

    .related-grid {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 24px;
        max-width: 960px;
        margin: 0 auto;
    }

    .related-card {
        display: flex;
        gap: 20px;
        background: var(--surface);
        border-radius: var(--radius-card);
        border: 1px solid var(--line);
        padding: 16px;
        align-items: center;
        transition: all .2s;
    }

    .related-card:hover {
        box-shadow: var(--shadow-hover);
        transform: translateY(-4px);
        border-color: rgba(14, 165, 164, .35);
    }

    .related-card img {
        width: 240px;
        height: 140px;
        object-fit: cover;
        border-radius: 10px;
        flex-shrink: 0;
    }

    .related-card h3 {
        font-size: 18px;
        font-weight: 600;
        margin-bottom: 8px;
        line-height: 1.4;
        color: var(--ink);
    }

    .related-card p {
        font-size: 14px;
        color: var(--ink-2);
        margin-bottom: 10px;
        line-height: 1.6;
    }

    .related-card .date {
        font-family: var(--font-mono);
        font-size: 13px;
        color: var(--ink-2);
    }

    .related-card .more {
        color: var(--primary);
        font-size: 14px;
        font-weight: 500;
        display: inline-flex;
        align-items: center;
        gap: 4px;
    }

    .faq-section {
        background: var(--surface);
        padding: var(--gap-section) 0;
    }

    .accordion {
        max-width: 800px;
        margin: 0 auto;
        background: transparent;
        border: none;
    }

    ul.accordion .accordion-item {
        background: var(--surface);
        border: 1px solid var(--line);
        border-radius: var(--radius-card);
        margin-bottom: 16px;
        overflow: hidden;
        transition: border-color .2s;
        list-style: none;
    }

    ul.accordion .accordion-item.is-active {
        border-color: rgba(14, 165, 164, .35);
    }

    ul.accordion .accordion-title {
        border: none;
        background: transparent;
        color: var(--ink);
        display: flex;
        justify-content: space-between;
        align-items: center;
        font-size: 16px;
        font-weight: 600;
        padding: 20px 24px;
        position: relative;
        line-height: 1.5;
        transition: color .2s;
    }

    ul.accordion .accordion-title:hover {
        background: var(--bg);
        color: var(--primary-deep);
    }

    ul.accordion .accordion-title::after {
        content: '+';
        font-size: 24px;
        color: var(--primary);
        font-weight: 300;
        transition: transform .3s;
        margin-left: 16px;
        flex-shrink: 0;
        line-height: 1;
    }

    ul.accordion .accordion-item.is-active .accordion-title {
        color: var(--primary-deep);
        background: var(--bg);
    }

    ul.accordion .accordion-item.is-active .accordion-title::after {
        content: '×';
        transform: rotate(45deg);
    }

    ul.accordion .accordion-content {
        border: none;
        border-top: 1px solid var(--line);
        padding: 16px 24px 22px;
        color: var(--ink-2);
        font-size: 15px;
        line-height: 1.8;
        background: var(--surface);
    }

    .cta-section {
        background: var(--dark);
        color: #fff;
        padding: 80px 0;
        position: relative;
        overflow: hidden;
        border-top: 1px solid var(--dark-line);
    }

    .cta-section::before {
        content: '';
        position: absolute;
        inset: 0;
        background-image:
            linear-gradient(rgba(255, 255, 255, .04) 1px, transparent 1px),
            linear-gradient(90deg, rgba(255, 255, 255, .04) 1px, transparent 1px);
        background-size: 48px 48px;
        pointer-events: none;
    }

    .cta-section .container {
        position: relative;
        z-index: 1;
    }

    .cta-section h2 {
        font-size: 34px;
        font-weight: 700;
        margin-bottom: 12px;
        letter-spacing: -.01em;
    }

    .cta-section > .container > p {
        color: rgba(255, 255, 255, .72);
        font-size: 16px;
        margin-bottom: 28px;
    }

    .cta-section .btn-lg {
        box-shadow: 0 8px 24px rgba(255, 122, 26, .35);
    }

    .cta-tip {
        font-family: var(--font-mono);
        font-size: 12px;
        color: rgba(255, 255, 255, .5);
        margin-top: 18px;
    }

    .site-footer {
        background: var(--dark);
        color: rgba(255, 255, 255, .8);
        padding: 64px 0 0;
        border-top: 1px solid var(--dark-line);
    }

    .footer-grid {
        display: grid;
        grid-template-columns: 2fr 1fr 1fr 1.2fr;
        gap: 40px;
        padding-bottom: 48px;
    }

    .footer-brand .logo {
        margin-bottom: 16px;
    }

    .footer-brand p {
        font-size: 14px;
        color: rgba(255, 255, 255, .55);
        line-height: 1.8;
        max-width: 320px;
    }

    .footer-col h4 {
        font-size: 16px;
        font-weight: 600;
        color: #fff;
        margin-bottom: 18px;
    }

    .footer-col ul li {
        margin-bottom: 10px;
    }

    .footer-col a {
        color: rgba(255, 255, 255, .6);
        font-size: 14px;
        transition: color .2s;
    }

    .footer-col a:hover {
        color: var(--accent);
    }

    .footer-contact p {
        font-size: 14px;
        color: rgba(255, 255, 255, .6);
        margin-bottom: 10px;
        display: flex;
        align-items: center;
        gap: 8px;
    }

    .footer-contact i {
        color: var(--primary);
        width: 16px;
        text-align: center;
    }

    .footer-bottom {
        border-top: 1px solid var(--dark-line);
        padding: 20px 0;
        display: flex;
        justify-content: space-between;
        flex-wrap: wrap;
        gap: 12px;
        color: rgba(255, 255, 255, .4);
        font-size: 13px;
    }

    @media (max-width: 1024px) {
        .site-header {
            height: auto;
            min-height: 64px;
        }

        .header-inner {
            flex-wrap: wrap;
            padding: 12px 20px;
            height: auto;
            min-height: 64px;
        }

        .nav-toggle {
            display: flex;
            margin-left: auto;
        }

        .main-nav {
            flex-basis: 100%;
            order: 4;
            flex-direction: column;
            align-items: stretch;
            gap: 8px;
            padding: 16px 0 8px;
            display: none;
            border-top: 1px solid var(--dark-line);
            margin-top: 12px;
        }

        .main-nav.open {
            display: flex;
        }

        .nav-link {
            padding: 12px 4px;
            font-size: 16px;
            border-radius: 8px;
        }

        .nav-link.active::after {
            display: none;
        }

        .nav-link.active,
        .nav-link:hover {
            background: rgba(255, 255, 255, .05);
            color: #fff;
        }

        .nav-cta {
            margin-left: 0;
            margin-top: 12px;
            padding-top: 12px;
            border-top: 1px solid var(--dark-line);
        }

        .nav-cta .btn {
            width: 100%;
        }

        .footer-grid {
            grid-template-columns: 1fr 1fr;
            gap: 32px;
        }

        .article-hero h1 {
            font-size: 32px;
        }
    }

    @media (max-width: 640px) {
        :root {
            --gap-section: 64px;
        }

        .container {
            padding: 0 20px;
        }

        .article-hero {
            padding: 40px 0 28px;
        }

        .article-hero h1 {
            font-size: 26px;
        }

        .article-meta {
            gap: 12px;
            font-size: 13px;
        }

        .article-main {
            padding: 40px 0 56px;
        }

        .article-main-container {
            padding: 0 20px;
        }

        .article-body {
            font-size: 16px;
        }

        .article-body h2 {
            font-size: 24px;
        }

        .article-body h3 {
            font-size: 20px;
        }

        .related-grid {
            grid-template-columns: 1fr;
        }

        .related-card {
            flex-direction: column;
            align-items: flex-start;
            padding: 20px;
        }

        .related-card img {
            width: 100%;
            height: 180px;
        }

        .footer-grid {
            grid-template-columns: 1fr;
            gap: 28px;
            padding-bottom: 32px;
        }

        .footer-bottom {
            flex-direction: column;
            align-items: center;
            text-align: center;
        }

        .cta-section {
            padding: 64px 0;
        }

        .cta-section h2 {
            font-size: 26px;
        }

        .article-cta {
            flex-direction: column;
            align-items: flex-start;
            padding: 20px;
        }

        .article-cta .btn {
            width: 100%;
        }

        .section-head h2 {
            font-size: 24px;
        }

        .breadcrumb .current {
            max-width: 200px;
        }
    }

/* roulang page: category3 */
:root{
  --bg:#F5F6F7;
  --surface:#FFFFFF;
  --ink:#16181D;
  --ink-2:#4B5563;
  --line:#E3E6E8;
  --primary:#0EA5A4;
  --primary-deep:#0B7C7B;
  --primary-soft:rgba(14,165,164,.12);
  --accent:#FF7A1A;
  --accent-deep:#E05E00;
  --dark:#101318;
  --dark-line:rgba(255,255,255,.08);
  --radius-card:16px;
  --radius-btn:10px;
  --radius-tag:999px;
  --shadow:0 1px 2px rgba(16,20,24,.06),0 1px 3px rgba(16,20,24,.10);
  --shadow-hover:0 12px 32px rgba(16,20,24,.12);
  --transition:0.2s ease;
  --container:1200px;
  --font-sans:-apple-system,"PingFang SC","Microsoft YaHei","Noto Sans SC",sans-serif;
  --font-mono:ui-monospace,"SF Mono","JetBrains Mono",Consolas,monospace;
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;scroll-margin-top:80px}
body{
  font-family:var(--font-sans);
  background:var(--bg);
  color:var(--ink);
  line-height:1.8;
  font-size:16px;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none;transition:color var(--transition)}
button{font-family:inherit;cursor:pointer;border:none;background:none}
ul,ol{list-style:none}
.container{max-width:var(--container);margin:0 auto;padding:0 24px}
.section{padding:96px 0}
.section-tight{padding:64px 0}
.text-center{text-align:center}

/* ===== Buttons ===== */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:12px 28px;
  border-radius:var(--radius-btn);
  font-weight:600;
  font-size:15px;
  line-height:1.4;
  transition:background var(--transition),transform var(--transition),box-shadow var(--transition);
  position:relative;
}
.btn i{font-size:16px}
.btn:active{transform:scale(.98)}
.btn:focus-visible{outline:2px solid var(--primary);outline-offset:2px}
.btn-accent{background:var(--accent);color:#fff}
.btn-accent:hover{background:var(--accent-deep);color:#fff}
.btn-primary{background:var(--primary);color:#fff}
.btn-primary:hover{background:var(--primary-deep);color:#fff}
.btn-outline{background:transparent;border:1px solid var(--primary);color:var(--primary)}
.btn-outline:hover{background:var(--primary-soft);color:var(--primary-deep)}
.btn-lg{padding:16px 42px;font-size:17px}
.btn-block{width:100%}

/* ===== Badge / Tag ===== */
.version-badge{
  position:absolute;
  top:-9px;left:auto;right:-9px;
  background:var(--dark);
  color:#fff;
  font-family:var(--font-mono);
  font-size:11px;
  padding:2px 8px;
  border-radius:4px;
  border:1px solid var(--dark-line);
  white-space:nowrap;
}
.tag{
  display:inline-block;
  background:var(--primary-soft);
  color:var(--primary-deep);
  font-size:13px;
  padding:4px 12px;
  border-radius:6px;
  font-weight:500;
}
.tag-accent{background:var(--accent);color:#fff;border-radius:var(--radius-tag);font-size:12px;padding:3px 10px}
.tag-version{
  font-family:var(--font-mono);
  background:rgba(255,255,255,.12);
  color:#fff;
  font-size:11px;
  padding:2px 8px;
  border-radius:4px;
}

/* ===== Header / Nav ===== */
.site-header{
  background:var(--dark);
  position:sticky;
  top:0;
  z-index:1000;
  border-bottom:1px solid var(--dark-line);
  height:64px;
  display:flex;
  align-items:center;
}
.header-inner{
  display:flex;
  align-items:center;
  gap:24px;
  width:100%;
  position:relative;
}
.logo{
  display:inline-flex;
  align-items:center;
  gap:10px;
  flex-shrink:0;
}
.logo-mark{
  width:32px;height:32px;
  background:var(--primary);
  border-radius:8px;
  position:relative;
  flex-shrink:0;
}
.logo-mark::before{
  content:'';
  position:absolute;
  inset:8px;
  border:2px solid #fff;
  border-top:none;
  border-right:none;
  border-radius:2px;
  transform:rotate(-45deg);
  top:10px;left:7px;
}
.logo-mark::after{
  content:'';
  position:absolute;
  width:6px;height:6px;
  background:#fff;
  border-radius:50%;
  bottom:5px;right:5px;
}
.logo-text{
  font-size:20px;
  font-weight:700;
  color:#fff;
  letter-spacing:.02em;
  white-space:nowrap;
}
.logo-blue{color:var(--primary)}
.main-nav{
  display:flex;
  align-items:center;
  gap:6px;
  margin-left:auto;
  margin-right:auto;
}
.main-nav .nav-link{
  display:inline-block;
  padding:8px 14px;
  color:rgba(255,255,255,.85);
  font-size:15px;
  font-weight:500;
  border-radius:6px;
  transition:color var(--transition),background var(--transition);
  position:relative;
}
.main-nav .nav-link:hover{color:#fff;background:rgba(255,255,255,.06)}
.main-nav .nav-link.active{color:#fff}
.main-nav .nav-link.active::after{
  content:'';
  position:absolute;
  left:14px;right:14px;bottom:2px;
  height:3px;
  background:var(--accent);
  border-radius:3px;
}
.header-actions{
  display:flex;
  align-items:center;
  gap:12px;
  flex-shrink:0;
}
.btn-download-nav{
  padding:8px 20px;
  font-size:14px;
  border-radius:var(--radius-btn);
}
.btn-download-nav .version-badge{
  top:-8px;right:-8px;
  background:#fff;
  color:var(--dark);
  border:1px solid var(--line);
}
.status-label{
  display:inline-block;
  background:var(--accent);
  color:#fff;
  font-size:12px;
  font-weight:600;
  padding:4px 10px;
  border-radius:4px;
  white-space:nowrap;
}
.nav-toggle{
  display:none;
  width:40px;height:40px;
  flex-direction:column;
  align-items:center;
  justify-content:center;
  gap:5px;
  border-radius:8px;
}
.nav-toggle span{
  display:block;
  width:20px;height:2px;
  background:#fff;
  border-radius:2px;
  transition:transform var(--transition),opacity var(--transition);
}
.nav-toggle.active span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.nav-toggle.active span:nth-child(2){opacity:0}
.nav-toggle.active span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

/* ===== Hero ===== */
.hero{
  background:var(--dark);
  color:#fff;
  padding:96px 0;
  position:relative;
  overflow:hidden;
}
.hero::before{
  content:'';
  position:absolute;
  inset:0;
  background:url('/assets/images/backpic/back-1.png') center/cover no-repeat;
  opacity:.35;
}
.hero::after{
  content:'';
  position:absolute;
  bottom:0;left:0;right:0;
  height:120px;
  background-image:
    linear-gradient(rgba(255,255,255,.06) 1px,transparent 1px),
    linear-gradient(90deg,rgba(255,255,255,.06) 1px,transparent 1px);
  background-size:40px 40px;
  pointer-events:none;
}
.hero .container{position:relative;z-index:2}
.hero-grid{
  display:flex;
  align-items:center;
  gap:60px;
}
.hero-content{flex:0 0 58%;max-width:58%}
.hero-visual{flex:0 0 42%;max-width:42%}
.hero h1{
  font-size:42px;
  font-weight:700;
  line-height:1.3;
  margin-bottom:16px;
  color:#fff;
}
.hero h1 span{color:var(--primary)}
.hero-sub{
  font-size:18px;
  color:rgba(255,255,255,.75);
  margin-bottom:12px;
  max-width:480px;
}
.hero-desc{
  font-size:15px;
  color:rgba(255,255,255,.6);
  margin-bottom:28px;
  max-width:520px;
  line-height:1.8;
}
.hero-meta{
  display:flex;
  flex-wrap:wrap;
  gap:16px;
  margin-top:20px;
  font-family:var(--font-mono);
  font-size:12px;
  color:rgba(255,255,255,.6);
}
.hero-meta span{display:inline-flex;align-items:center;gap:6px}
.hero-btn-group{display:flex;flex-wrap:wrap;gap:12px}
.hero-visual-box{
  border:1px solid var(--dark-line);
  border-radius:16px;
  overflow:hidden;
  box-shadow:0 0 60px rgba(14,165,164,.15);
  background:rgba(255,255,255,.03);
  padding:24px;
}
.hero-visual-box img{
  width:100%;
  border-radius:12px;
}
.hero-chip{
  display:flex;
  flex-wrap:wrap;
  gap:8px;
  margin-bottom:20px;
}
.hero-chip .tag{
  background:rgba(255,255,255,.1);
  color:rgba(255,255,255,.9);
  border:1px solid var(--dark-line);
}

/* ===== Section Header ===== */
.section-head{
  margin-bottom:48px;
}
.section-head .label{
  font-family:var(--font-mono);
  font-size:12px;
  color:var(--primary);
  text-transform:uppercase;
  letter-spacing:.12em;
  margin-bottom:8px;
}
.section-head h2{
  font-size:28px;
  font-weight:700;
  color:var(--ink);
  line-height:1.4;
}
.section-head p{
  font-size:15px;
  color:var(--ink-2);
  margin-top:8px;
  max-width:640px;
}
.section-head.center{text-align:center}
.section-head.center p{margin-left:auto;margin-right:auto}

/* ===== Latest Version Highlight ===== */
.latest-version{
  background:var(--surface);
  border-bottom:1px solid var(--line);
}
.version-feature-grid{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:48px;
  align-items:center;
}
.version-feature-img{
  border-radius:var(--radius-card);
  overflow:hidden;
  box-shadow:var(--shadow);
}
.version-feature-img img{
  width:100%;
  height:340px;
  object-fit:cover;
}
.version-feature-list{display:flex;flex-direction:column;gap:24px}
.version-feature-item{
  display:flex;
  gap:16px;
  padding:20px;
  border:1px solid var(--line);
  border-radius:var(--radius-card);
  transition:box-shadow var(--transition),transform var(--transition);
}
.version-feature-item:hover{
  box-shadow:var(--shadow-hover);
  transform:translateY(-4px);
}
.version-feature-icon{
  width:48px;height:48px;
  background:var(--primary-soft);
  border-radius:12px;
  display:flex;
  align-items:center;
  justify-content:center;
  color:var(--primary);
  font-size:20px;
  flex-shrink:0;
}
.version-feature-item h3{font-size:17px;font-weight:600;margin-bottom:4px}
.version-feature-item p{font-size:14px;color:var(--ink-2);line-height:1.7}

/* ===== Timeline ===== */
.timeline-section{background:var(--bg)}
.timeline{
  position:relative;
  padding-left:32px;
}
.timeline::before{
  content:'';
  position:absolute;
  left:10px;top:0;bottom:0;
  width:2px;
  background:var(--line);
}
.timeline-item{
  position:relative;
  padding-bottom:32px;
}
.timeline-item:last-child{padding-bottom:0}
.timeline-dot{
  position:absolute;
  left:-27px;top:8px;
  width:14px;height:14px;
  border-radius:50%;
  background:var(--primary);
  border:3px solid var(--surface);
  box-shadow:0 0 0 2px var(--primary);
}
.timeline-dot.current{background:var(--accent);box-shadow:0 0 0 2px var(--accent)}
.timeline-card{
  background:var(--surface);
  border:1px solid var(--line);
  border-radius:var(--radius-card);
  padding:24px;
  box-shadow:var(--shadow);
  transition:box-shadow var(--transition),transform var(--transition);
}
.timeline-card:hover{box-shadow:var(--shadow-hover);transform:translateY(-4px)}
.timeline-head{
  display:flex;
  align-items:center;
  gap:16px;
  margin-bottom:12px;
  flex-wrap:wrap;
}
.timeline-version{
  font-family:var(--font-mono);
  font-size:18px;
  font-weight:700;
  color:var(--primary-deep);
  background:var(--primary-soft);
  padding:4px 14px;
  border-radius:6px;
}
.timeline-version.current{background:var(--accent);color:#fff}
.timeline-date{
  font-family:var(--font-mono);
  font-size:12px;
  color:var(--ink-2);
}
.timeline-body ul{display:flex;flex-direction:column;gap:4px}
.timeline-body li{
  font-size:14px;
  color:var(--ink-2);
  padding-left:16px;
  position:relative;
}
.timeline-body li::before{
  content:'';
  position:absolute;
  left:0;top:10px;
  width:6px;height:6px;
  background:var(--primary);
  border-radius:50%;
}
.timeline-tags{display:flex;gap:8px;margin-top:12px;flex-wrap:wrap}

/* ===== Mixed Card Grid ===== */
.cards-section{background:var(--surface)}
.mixed-grid{
  display:grid;
  grid-template-columns:1fr 1fr 1fr;
  gap:24px;
}
.card-horizontal{
  grid-column:span 2;
  display:flex;
  background:var(--surface);
  border:1px solid var(--line);
  border-radius:var(--radius-card);
  overflow:hidden;
  box-shadow:var(--shadow);
  transition:box-shadow var(--transition),transform var(--transition);
}
.card-horizontal:hover{box-shadow:var(--shadow-hover);transform:translateY(-4px)}
.card-horizontal .card-img{
  width:240px;
  flex-shrink:0;
  min-height:220px;
}
.card-horizontal .card-img img{
  width:100%;height:100%;
  object-fit:cover;
}
.card-horizontal .card-body{
  padding:28px;
  display:flex;
  flex-direction:column;
  justify-content:center;
}
.card-horizontal .card-body h3{
  font-size:20px;
  font-weight:600;
  margin:12px 0 8px;
}
.card-horizontal .card-body p{
  font-size:14px;
  color:var(--ink-2);
  line-height:1.8;
}
.card-vertical{
  background:var(--surface);
  border:1px solid var(--line);
  border-radius:var(--radius-card);
  overflow:hidden;
  box-shadow:var(--shadow);
  transition:box-shadow var(--transition),transform var(--transition);
  display:flex;
  flex-direction:column;
}
.card-vertical:hover{box-shadow:var(--shadow-hover);transform:translateY(-4px)}
.card-vertical .card-img{
  height:180px;
  overflow:hidden;
}
.card-vertical .card-img img{
  width:100%;height:100%;
  object-fit:cover;
  transition:transform .3s ease;
}
.card-vertical:hover .card-img img{transform:scale(1.04)}
.card-vertical .card-body{
  padding:20px;
  flex:1;
  display:flex;
  flex-direction:column;
}
.card-vertical .card-body h3{
  font-size:16px;
  font-weight:600;
  margin:10px 0 6px;
}
.card-vertical .card-body p{
  font-size:13px;
  color:var(--ink-2);
  line-height:1.7;
  flex:1;
}
.card-meta{
  display:flex;
  align-items:center;
  gap:8px;
  margin-top:12px;
  font-size:12px;
  color:var(--ink-2);
}
.card-meta i{font-size:11px}
.read-link{
  font-size:13px;
  font-weight:600;
  color:var(--primary);
  display:inline-flex;
  align-items:center;
  gap:4px;
}
.read-link:hover{color:var(--primary-deep)}

/* ===== Roadmap ===== */
.roadmap-section{background:var(--dark);color:#fff;position:relative;overflow:hidden}
.roadmap-section::after{
  content:'';
  position:absolute;
  bottom:0;left:0;right:0;
  height:100px;
  background-image:
    linear-gradient(rgba(255,255,255,.05) 1px,transparent 1px),
    linear-gradient(90deg,rgba(255,255,255,.05) 1px,transparent 1px);
  background-size:40px 40px;
  pointer-events:none;
}
.roadmap-section .container{position:relative;z-index:2}
.roadmap-section .section-head h2{color:#fff}
.roadmap-section .section-head p{color:rgba(255,255,255,.6)}
.roadmap-grid{
  display:grid;
  grid-template-columns:repeat(3,1fr);
  gap:24px;
}
.roadmap-card{
  background:rgba(255,255,255,.04);
  border:1px solid var(--dark-line);
  border-radius:var(--radius-card);
  padding:28px;
  transition:background var(--transition),transform var(--transition);
}
.roadmap-card:hover{background:rgba(255,255,255,.08);transform:translateY(-4px)}
.roadmap-card .phase{
  font-family:var(--font-mono);
  font-size:12px;
  color:var(--accent);
  text-transform:uppercase;
  letter-spacing:.08em;
}
.roadmap-card h3{
  font-size:18px;
  font-weight:600;
  color:#fff;
  margin:12px 0 8px;
}
.roadmap-card p{
  font-size:14px;
  color:rgba(255,255,255,.6);
  line-height:1.7;
}
.roadmap-icon{
  width:44px;height:44px;
  background:rgba(255,255,255,.08);
  border-radius:10px;
  display:flex;
  align-items:center;
  justify-content:center;
  font-size:18px;
  color:var(--primary);
  margin-bottom:16px;
}

/* ===== FAQ ===== */
.faq-section{background:var(--bg)}
.faq-container{
  max-width:800px;
  margin:0 auto;
}
.accordion-item{
  background:var(--surface);
  border:1px solid var(--line);
  border-radius:var(--radius-card);
  margin-bottom:16px;
  overflow:hidden;
  transition:box-shadow var(--transition);
}
.accordion-item:hover{box-shadow:var(--shadow)}
.accordion-title{
  width:100%;
  display:flex;
  align-items:center;
  justify-content:space-between;
  padding:20px 24px;
  font-size:16px;
  font-weight:600;
  color:var(--ink);
  text-align:left;
  background:none;
  border:none;
  cursor:pointer;
  transition:color var(--transition);
}
.accordion-title i{
  font-size:16px;
  color:var(--ink-2);
  transition:transform var(--transition),color var(--transition);
  flex-shrink:0;
}
.accordion-item.open .accordion-title{color:var(--primary)}
.accordion-item.open .accordion-title i{
  transform:rotate(45deg);
  color:var(--primary);
}
.accordion-content{
  max-height:0;
  overflow:hidden;
  transition:max-height .3s ease;
}
.accordion-inner{
  padding:0 24px 20px;
  font-size:15px;
  color:var(--ink-2);
  line-height:1.8;
}

/* ===== CTA ===== */
.cta-section{
  background:var(--dark);
  color:#fff;
  padding:88px 0;
  text-align:center;
  position:relative;
  overflow:hidden;
}
.cta-section::before{
  content:'';
  position:absolute;
  inset:0;
  background:url('/assets/images/backpic/back-2.webp') center/cover no-repeat;
  opacity:.2;
}
.cta-section::after{
  content:'';
  position:absolute;
  bottom:0;left:0;right:0;
  height:80px;
  background-image:
    linear-gradient(rgba(255,255,255,.05) 1px,transparent 1px),
    linear-gradient(90deg,rgba(255,255,255,.05) 1px,transparent 1px);
  background-size:40px 40px;
  pointer-events:none;
}
.cta-section .container{position:relative;z-index:2}
.cta-section h2{
  font-size:32px;
  font-weight:700;
  color:#fff;
  margin-bottom:12px;
}
.cta-section p{
  font-size:16px;
  color:rgba(255,255,255,.7);
  margin-bottom:32px;
}
.cta-meta{
  margin-top:20px;
  font-family:var(--font-mono);
  font-size:12px;
  color:rgba(255,255,255,.5);
}

/* ===== Footer ===== */
.site-footer{
  background:var(--dark);
  color:rgba(255,255,255,.7);
  padding:64px 0 0;
  border-top:1px solid var(--dark-line);
}
.footer-grid{
  display:grid;
  grid-template-columns:2fr 1fr 1fr 1.5fr;
  gap:40px;
  padding-bottom:40px;
}
.footer-brand .logo-text{font-size:20px}
.footer-brand p{
  font-size:14px;
  color:rgba(255,255,255,.55);
  margin-top:16px;
  line-height:1.8;
  max-width:320px;
}
.footer-col h4{
  font-size:15px;
  font-weight:600;
  color:#fff;
  margin-bottom:16px;
}
.footer-col ul li{
  margin-bottom:10px;
  font-size:14px;
}
.footer-col ul li a{
  color:rgba(255,255,255,.6);
  transition:color var(--transition);
}
.footer-col ul li a:hover{color:var(--primary)}
.footer-contact p{
  font-size:14px;
  color:rgba(255,255,255,.6);
  margin-bottom:10px;
}
.footer-contact i{
  width:20px;
  color:var(--primary);
  margin-right:4px;
}
.footer-bottom{
  border-top:1px solid var(--dark-line);
  padding:20px 0;
  display:flex;
  justify-content:space-between;
  align-items:center;
  font-size:13px;
  color:rgba(255,255,255,.4);
  flex-wrap:wrap;
  gap:8px;
}
.footer-legal{font-size:13px}

/* ===== Responsive ===== */
@media(max-width:1024px){
  .hero-grid{flex-direction:column;gap:40px}
  .hero-content,.hero-visual{flex:none;max-width:100%}
  .hero h1{font-size:32px}
  .section{padding:72px 0}
  .mixed-grid{grid-template-columns:1fr 1fr}
  .card-horizontal{grid-column:span 2}
  .version-feature-grid{grid-template-columns:1fr;gap:32px}
  .roadmap-grid{grid-template-columns:1fr 1fr}
  .footer-grid{grid-template-columns:1fr 1fr}
}
@media(max-width:768px){
  .nav-toggle{display:flex}
  .main-nav{
    position:fixed;
    top:64px;
    left:0;
    right:0;
    background:var(--dark);
    flex-direction:column;
    align-items:stretch;
    padding:16px 24px;
    gap:4px;
    border-bottom:1px solid var(--dark-line);
    transform:translateY(-120%);
    opacity:0;
    pointer-events:none;
    transition:transform .3s ease,opacity .3s ease;
    margin:0;
    z-index:999;
  }
  .main-nav.open{
    transform:translateY(0);
    opacity:1;
    pointer-events:auto;
  }
  .main-nav .nav-link{
    padding:12px 14px;
    font-size:16px;
  }
  .main-nav .nav-link.active::after{display:none}
  .main-nav .nav-link.active{
    background:rgba(255,255,255,.06);
    border-radius:8px;
    color:var(--primary);
  }
  .header-actions .btn-download-nav{display:none}
  .status-label{display:none}
  .section{padding:64px 0}
  .section-head h2{font-size:24px}
  .hero h1{font-size:26px}
  .timeline-card{padding:20px}
  .mixed-grid{grid-template-columns:1fr}
  .card-horizontal{grid-column:span 1;flex-direction:column}
  .card-horizontal .card-img{width:100%;min-height:auto;height:200px}
  .roadmap-grid{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr;gap:32px}
  .footer-bottom{flex-direction:column;text-align:center}
  .cta-section h2{font-size:26px}
  .hero-btn-group{flex-direction:column;width:100%}
  .hero-btn-group .btn{width:100%}
  .version-feature-img img{height:220px}
}
@media(max-width:520px){
  .container{padding:0 16px}
  .header-inner{gap:12px}
  .logo-text{font-size:17px}
  .hero{padding:64px 0}
  .hero-meta{flex-direction:column;gap:6px}
}