/* roulang page: index */
/* ============ Design Variables ============ */
:root {
  --bg: #0B0F14;
  --surface: #131B24;
  --surface-2: #1B2733;
  --surface-3: #3A4A5E;
  --border: #263242;
  --border-strong: #3A4A5E;
  --text-1: #E8EDF3;
  --text-2: #A3B0BD;
  --text-3: #68788A;
  --primary: #FF6B2C;
  --primary-hover: #FF8540;
  --primary-soft: rgba(255, 107, 44, .12);
  --accent: #2DD4A7;
  --star: #FFC53D;
  --danger: #FF5C72;
  --radius-card: 18px;
  --radius-btn: 12px;
  --radius-pill: 999px;
  --radius-panel: 20px;
  --shadow-card: 0 2px 8px rgba(0, 0, 0, .35), 0 8px 24px rgba(0, 0, 0, .18);
  --shadow-card-hover: 0 4px 12px rgba(0, 0, 0, .45), 0 12px 32px rgba(255, 107, 44, .08);
  --shadow-btn: 0 6px 20px rgba(255, 107, 44, .35);
  --container-max: 1200px;
  --spacer: 96px;
}

/* ============ Reset & Base ============ */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", Inter, "SF Pro Display", "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text-1);
  font-size: 16px;
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: var(--text-2); text-decoration: none; transition: color .2s ease; }
a:hover { color: var(--primary); }
button { font-family: inherit; cursor: pointer; background: none; border: none; color: inherit; }
h1, h2, h3, h4 { font-weight: 700; line-height: 1.35; }

.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
}

/* ============ Buttons ============ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border-radius: var(--radius-btn);
  font-size: 15px;
  font-weight: 600;
  padding: 12px 24px;
  border: 1px solid transparent;
  transition: transform .2s ease, background-color .2s ease, border-color .2s ease, box-shadow .2s ease, color .2s ease;
  white-space: nowrap;
}
.btn:focus { outline: 2px solid var(--primary); outline-offset: 2px; }
.btn:active { transform: scale(.98); }
.btn-primary {
  background: var(--primary);
  color: #fff;
  box-shadow: var(--shadow-btn);
}
.btn-primary:hover { background: var(--primary-hover); color: #fff; transform: translateY(-2px); box-shadow: 0 8px 26px rgba(255, 107, 44, .45); }
.btn-primary:active { transform: scale(.98); box-shadow: 0 4px 14px rgba(255, 107, 44, .3); }
.btn-outline {
  background: transparent;
  border-color: var(--border);
  color: var(--text-1);
}
.btn-outline:hover { border-color: var(--primary); color: var(--primary); background: var(--primary-soft); }
.btn-lg { padding: 16px 36px; font-size: 16px; border-radius: 14px; }
.btn-xl { padding: 18px 44px; font-size: 17px; border-radius: 14px; }

/* ============ Header / Nav ============ */
.site-header { padding-top: 16px; position: relative; z-index: 100; }
.nav-panel {
  background: #10161E;
  border: 1px solid #1F2A36;
  border-radius: var(--radius-panel);
  padding: 8px;
  display: flex;
  align-items: center;
  gap: 16px;
  box-shadow: var(--shadow-card);
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 8px 12px;
  color: var(--text-1);
  font-weight: 800;
  font-size: 19px;
  letter-spacing: .3px;
  white-space: nowrap;
}
.brand:hover { color: var(--text-1); }
.brand-icon {
  width: 38px;
  height: 38px;
  border-radius: 11px;
  background: linear-gradient(135deg, var(--primary), #FF9F45);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 17px;
  box-shadow: 0 4px 12px rgba(255, 107, 44, .35);
  flex-shrink: 0;
}
.main-nav {
  display: flex;
  gap: 8px;
  flex: 1;
  min-width: 0;
}
.nav-item {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2px;
  background: #1A2532;
  border-radius: var(--radius-btn);
  padding: 8px 18px;
  color: var(--text-2);
  font-size: 13px;
  line-height: 1.4;
  transition: background-color .2s ease, color .2s ease, transform .2s ease;
  min-width: 0;
}
.nav-item i { font-size: 16px; line-height: 1; }
.nav-item:hover { background: #2A3543; color: var(--text-1); }
.nav-item.active {
  background: var(--primary-soft);
  color: var(--primary);
}
.nav-item.active::after {
  content: '';
  position: absolute;
  bottom: 3px;
  left: 16px;
  right: 16px;
  height: 2px;
  background: var(--primary);
  border-radius: 999px;
}
.nav-cta { margin-left: auto; flex-shrink: 0; }
.nav-toggle {
  display: none;
  width: 42px;
  height: 42px;
  border-radius: 12px;
  background: #1A2532;
  color: var(--text-1);
  font-size: 17px;
  align-items: center;
  justify-content: center;
  transition: background-color .2s ease;
  flex-shrink: 0;
}
.nav-toggle:hover { background: #2A3543; }
.nav-toggle.active { background: var(--primary-soft); color: var(--primary); }

/* ============ Hero ============ */
.hero {
  position: relative;
  margin-top: 16px;
  padding: 100px 0 110px;
  overflow: hidden;
  border-radius: var(--radius-panel);
  box-shadow: var(--shadow-card);
}
.hero-bg {
  position: absolute;
  inset: 0;
  background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
  z-index: 0;
}
.hero-bg::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(100deg, rgba(11, 15, 20, .95) 0%, rgba(11, 15, 20, .75) 50%, rgba(11, 15, 20, .45) 100%);
}
.hero-inner { position: relative; z-index: 1; display: flex; align-items: center; min-height: 420px; }
.hero-content { max-width: 720px; }
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--primary-soft);
  color: var(--primary);
  font-size: 13px;
  font-weight: 600;
  padding: 6px 16px;
  border-radius: var(--radius-pill);
  margin-bottom: 24px;
  letter-spacing: .3px;
}
.hero h1 {
  font-size: clamp(2rem, 4.5vw, 3.2rem);
  font-weight: 800;
  line-height: 1.25;
  margin-bottom: 22px;
  color: var(--text-1);
}
.hero-subtitle {
  font-size: 17px;
  line-height: 1.9;
  color: var(--text-2);
  max-width: 52ch;
  margin-bottom: 34px;
}
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }
.hero-note {
  position: absolute;
  right: 32px;
  bottom: 36px;
  writing-mode: vertical-rl;
  font-size: 12px;
  letter-spacing: 6px;
  color: rgba(255, 255, 255, .5);
  z-index: 1;
  font-weight: 400;
}

/* ============ Section Common ============ */
.section { padding: var(--spacer) 0; }
.section-head { margin-bottom: 48px; max-width: 720px; }
.section-head h2 {
  font-size: clamp(1.4rem, 3vw, 2.1rem);
  font-weight: 700;
  margin-bottom: 12px;
  line-height: 1.35;
  color: var(--text-1);
}
.section-head p { color: var(--text-2); font-size: 15px; }
.section-more {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 14px;
  color: var(--primary);
  font-weight: 600;
  transition: gap .2s ease;
}
.section-more:hover { gap: 10px; color: var(--primary-hover); }

/* Feature Grid */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  grid-auto-flow: dense;
}
.feature-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  padding: 28px 26px;
  box-shadow: var(--shadow-card);
  transition: transform .2s ease, border-color .2s ease, box-shadow .2s ease;
  position: relative;
  overflow: hidden;
}
.feature-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-strong);
  box-shadow: var(--shadow-card-hover);
}
.feature-card::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--primary);
  opacity: 0;
  transition: opacity .2s ease;
  border-radius: 0 3px 3px 0;
}
.feature-card:hover::before { opacity: 1; }
.feature-card:nth-child(1) { grid-column: span 1; }
.feature-card:nth-child(2) { grid-column: span 1; }
.feature-card:nth-child(3) { grid-column: span 2; }
.feature-card:nth-child(4) { grid-column: span 1; }
.feature-icon {
  width: 48px;
  height: 48px;
  border-radius: 13px;
  background: var(--primary-soft);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  margin-bottom: 18px;
  transition: color .2s ease;
}
.feature-card:hover .feature-icon { color: var(--primary-hover); }
.feature-card h3 { font-size: 1.15rem; font-weight: 700; margin-bottom: 10px; color: var(--text-1); }
.feature-card p { color: var(--text-2); font-size: 14px; line-height: 1.8; }

/* ============ Carousel ============ */
.carousel-section { background: var(--bg); }
.carousel-head { display: flex; justify-content: space-between; align-items: flex-end; margin-bottom: 40px; gap: 20px; flex-wrap: wrap; }
.carousel-viewport {
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  scrollbar-width: none;
  -ms-overflow-style: none;
  padding: 10px 0 20px;
  cursor: grab;
}
.carousel-viewport::-webkit-scrollbar { display: none; }
.carousel-viewport:active { cursor: grabbing; }
.carousel-track { display: flex; gap: 20px; }
.carousel-card {
  flex: 0 0 46%;
  scroll-snap-align: center;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  padding: 16px;
  transition: transform .2s ease, border-color .2s ease, box-shadow .2s ease;
  box-shadow: var(--shadow-card);
}
.carousel-card:hover { transform: translateY(-3px); border-color: var(--border-strong); }
.carousel-card.active-card { opacity: 1; }
.carousel-card:not(.active-card) { opacity: .55; }
.carousel-img {
  aspect-ratio: 3 / 2;
  overflow: hidden;
  border-radius: 14px;
  border: 1px solid var(--border);
  background: var(--surface-2);
}
.carousel-img img { width: 100%; height: 100%; object-fit: cover; transition: transform .35s ease; }
.carousel-card:hover .carousel-img img { transform: scale(1.03); }
.carousel-card h3 { font-size: 1.05rem; font-weight: 700; margin: 16px 4px 4px; color: var(--text-1); }
.carousel-card p { font-size: 13px; color: var(--text-2); margin: 0 4px 8px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.carousel-nav { display: flex; align-items: center; justify-content: space-between; margin-top: 24px; }
.carousel-arrows { display: flex; gap: 10px; }
.carousel-arrow {
  width: 40px;
  height: 40px;
  border-radius: 12px;
  background: rgba(255, 255, 255, .05);
  color: var(--text-2);
  font-size: 15px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background-color .2s ease, color .2s ease;
  border: 1px solid var(--border);
}
.carousel-arrow:hover { background: var(--primary); color: #fff; border-color: var(--primary); }
.carousel-arrow:active { transform: scale(.95); }
.carousel-dots { display: flex; gap: 6px; align-items: center; }
.carousel-dot {
  width: 8px;
  height: 8px;
  border-radius: 999px;
  background: rgba(255, 255, 255, .2);
  transition: width .2s ease, background-color .2s ease;
  padding: 0;
}
.carousel-dot.active { width: 24px; background: var(--primary); }

/* ============ System Requirements ============ */
.sysreq-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}
.spec-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  padding: 12px 24px;
  box-shadow: var(--shadow-card);
}
.spec-row {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 20px 0;
  border-bottom: 1px solid rgba(255, 255, 255, .06);
}
.spec-row:last-child { border-bottom: none; }
.spec-icon {
  width: 40px;
  height: 40px;
  border-radius: 12px;
  background: var(--primary-soft);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 17px;
  flex-shrink: 0;
}
.spec-name { font-size: 14px; color: var(--text-2); width: 80px; flex-shrink: 0; }
.spec-value { font-size: 14px; color: var(--text-1); font-weight: 600; flex: 1; text-align: right; }
.device-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}
.device-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  padding: 24px 20px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 6px;
  text-align: center;
  box-shadow: var(--shadow-card);
  transition: border-color .2s ease, transform .2s ease;
}
.device-card:hover { border-color: var(--primary); transform: translateY(-3px); }
.device-card i { font-size: 30px; color: var(--primary); margin-bottom: 6px; }
.device-card span { font-size: 15px; font-weight: 600; color: var(--text-1); }
.device-card small { font-size: 12px; color: var(--text-3); }

/* ============ Reviews ============ */
.review-wrap { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-card); padding: 40px; box-shadow: var(--shadow-card); }
.reviews-summary { display: flex; align-items: center; gap: 20px; margin-bottom: 36px; flex-wrap: wrap; }
.score-big { font-size: 48px; font-weight: 800; color: var(--text-1); line-height: 1; letter-spacing: -1px; }
.stars { color: var(--star); font-size: 16px; letter-spacing: 3px; }
.review-count { font-size: 13px; color: var(--text-2); }
.review-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.review-card {
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  padding: 24px;
  position: relative;
  transition: border-color .2s ease, transform .2s ease;
}
.review-card:hover { border-color: var(--border-strong); transform: translateY(-3px); }
.review-card.featured::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--primary);
  border-radius: 999px;
}
.review-card .stars { margin-bottom: 10px; display: block; font-size: 14px; }
.review-card p { font-size: 14px; color: var(--text-1); line-height: 1.7; margin-bottom: 16px; min-height: 68px; }
.review-author { font-size: 14px; font-weight: 600; color: var(--text-1); }
.review-tag {
  display: inline-block;
  background: var(--surface-2);
  border: 1px solid var(--border);
  color: var(--text-2);
  font-size: 12px;
  padding: 2px 12px;
  border-radius: var(--radius-pill);
  margin-left: 8px;
}

/* ============ FAQ ============ */
.faq-container { max-width: 860px; margin: 0 auto; }
.faq-list { display: flex; flex-direction: column; gap: 16px; }
.faq-item {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  overflow: hidden;
  transition: background-color .2s ease, border-color .2s ease;
}
.faq-item.open { background: var(--surface-2); border-color: var(--border-strong); }
.faq-question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 22px 24px;
  font-size: 15px;
  font-weight: 600;
  color: var(--text-1);
  text-align: left;
  transition: color .2s ease;
}
.faq-question:hover { color: var(--primary); }
.faq-toggle {
  width: 30px;
  height: 30px;
  border-radius: 9px;
  background: var(--primary-soft);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  transition: transform .25s ease, background-color .2s ease;
  flex-shrink: 0;
}
.faq-item.open .faq-toggle { transform: rotate(45deg); background: var(--primary); color: #fff; }
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height .3s ease;
}
.faq-item.open .faq-answer { max-height: 260px; }
.faq-answer p {
  padding: 0 24px 22px;
  border-left: 3px solid var(--accent);
  margin-left: 24px;
  padding-left: 18px;
  color: var(--text-2);
  font-size: 14px;
  line-height: 1.9;
}

/* ============ Download CTA ============ */
.download-card {
  position: relative;
  border-radius: 24px;
  padding: 64px 48px;
  text-align: center;
  overflow: hidden;
  box-shadow: var(--shadow-card);
}
.download-bg {
  position: absolute;
  inset: 0;
  background: url('/assets/images/backpic/back-2.png') center/cover no-repeat;
  z-index: 0;
}
.download-bg::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(120deg, rgba(11, 15, 20, .96) 0%, rgba(11, 15, 20, .88) 100%);
}
.download-card > * { position: relative; z-index: 1; }
.download-card h2 {
  font-size: clamp(1.6rem, 3.2vw, 2.4rem);
  font-weight: 800;
  margin-bottom: 14px;
  color: var(--text-1);
}
.download-card > p { color: var(--text-2); margin-bottom: 36px; font-size: 15px; }
.download-actions { display: flex; align-items: center; justify-content: center; gap: 32px; flex-wrap: wrap; margin-bottom: 22px; }
.qr-block { display: flex; flex-direction: column; align-items: center; gap: 8px; }
.qr-placeholder {
  width: 96px;
  height: 96px;
  background: #fff;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #111;
  font-size: 34px;
  border: 1px solid var(--border);
}
.qr-block span { font-size: 13px; color: var(--text-2); }
.download-meta { font-size: 13px; color: var(--text-3); margin-bottom: 28px; }
.security-badges { display: flex; align-items: center; justify-content: center; gap: 28px; flex-wrap: wrap; }
.security-badges span {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  color: var(--text-2);
}
.security-badges i { color: var(--accent); }

/* ============ News / CMS List ============ */
.news-list { display: flex; flex-direction: column; gap: 20px; }
.news-card {
  display: flex;
  align-items: stretch;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  padding: 16px;
  gap: 20px;
  transition: transform .2s ease, border-color .2s ease, box-shadow .2s ease;
  box-shadow: var(--shadow-card);
}
.news-card:hover {
  transform: translateY(-2px);
  border-color: var(--primary);
  box-shadow: var(--shadow-card-hover);
}
.news-thumb {
  flex-shrink: 0;
  width: 168px;
  height: 96px;
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid var(--border);
  background: var(--surface-2);
}
.news-thumb img { width: 100%; height: 100%; object-fit: cover; transition: transform .3s ease; }
.news-card:hover .news-thumb img { transform: scale(1.05); }
.news-body { display: flex; flex-direction: column; justify-content: center; min-width: 0; flex: 1; }
.news-tag {
  display: inline-block;
  background: var(--primary-soft);
  color: var(--primary);
  font-size: 12px;
  font-weight: 600;
  padding: 2px 12px;
  border-radius: var(--radius-pill);
  margin-bottom: 10px;
  width: fit-content;
}
.news-body h3 { font-size: 1.05rem; font-weight: 600; margin-bottom: 6px; line-height: 1.5; }
.news-body h3 a { color: var(--text-1); transition: color .2s ease; }
.news-body h3 a:hover { color: var(--primary); }
.news-excerpt {
  font-size: 13px;
  color: var(--text-2);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  margin-bottom: 8px;
}
.news-meta { display: flex; gap: 18px; font-size: 13px; color: var(--text-3); }
.news-meta i { margin-right: 3px; }
.news-empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 80px 20px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  gap: 16px;
  box-shadow: var(--shadow-card);
}
.news-empty-icon {
  width: 72px;
  height: 72px;
  border-radius: 50%;
  background: var(--primary-soft);
  color: var(--primary);
  font-size: 30px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.news-empty p { color: var(--text-2); font-size: 15px; }

/* ============ Footer ============ */
.site-footer {
  background: #0D1218;
  border-top: 1px solid var(--border);
  margin-top: 40px;
  padding-top: 64px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 48px;
}
.footer-brand .footer-logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--text-1);
  font-weight: 800;
  font-size: 18px;
  margin-bottom: 16px;
}
.footer-logo .brand-icon { width: 32px; height: 32px; font-size: 14px; border-radius: 9px; }
.footer-brand p { color: var(--text-3); font-size: 14px; line-height: 1.9; margin-bottom: 20px; max-width: 300px; }
.social-icons { display: flex; gap: 12px; }
.social-icons a {
  width: 38px;
  height: 38px;
  border-radius: 10px;
  background: var(--surface-2);
  color: var(--text-2);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 15px;
  transition: background-color .2s ease, color .2s ease;
}
.social-icons a:hover { background: var(--primary); color: #fff; }
.footer-col h4 { font-size: 15px; font-weight: 600; color: var(--text-1); margin-bottom: 18px; }
.footer-col a { display: block; color: var(--text-2); font-size: 14px; padding: 5px 0; transition: color .2s ease; }
.footer-col a:hover { color: var(--primary); }
.footer-col p { color: var(--text-3); font-size: 13px; padding: 4px 0; }
.footer-bottom {
  border-top: 1px solid var(--border);
  padding: 22px 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  font-size: 13px;
  color: var(--text-3);
}

/* ============ Responsive ============ */
@media (max-width: 1079px) {
  :root { --spacer: 72px; }
  .feature-grid { grid-template-columns: repeat(2, 1fr); }
  .feature-card:nth-child(3) { grid-column: span 2; }
  .feature-card:nth-child(1), .feature-card:nth-child(2), .feature-card:nth-child(4) { grid-column: span 1; }
  .sysreq-grid { grid-template-columns: 1fr; }
  .review-grid { grid-template-columns: 1fr; }
  .review-card p { min-height: 0; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .carousel-card { flex: 0 0 60%; }
  .nav-item { padding: 8px 14px; }
  .news-thumb { width: 140px; height: 84px; }
}
@media (max-width: 767px) {
  :root { --spacer: 64px; }
  .container { padding: 0 16px; }
  .nav-toggle { display: flex; }
  .nav-cta { display: none; }
  .main-nav {
    position: absolute;
    top: calc(100% + 8px);
    left: 16px;
    right: 16px;
    flex-direction: column;
    gap: 8px;
    background: #10161E;
    border: 1px solid #1F2A36;
    border-radius: var(--radius-panel);
    padding: 12px;
    display: none;
    box-shadow: var(--shadow-card);
    z-index: 999;
  }
  .main-nav.open { display: flex; }
  .nav-item { flex-direction: row; justify-content: flex-start; gap: 10px; padding: 12px 16px; }
  .nav-item.active::after { left: 16px; right: auto; width: 28px; }
  .hero { padding: 60px 0 80px; }
  .hero-inner { min-height: auto; }
  .hero-subtitle { font-size: 15px; }
  .hero-actions { flex-direction: column; align-items: stretch; }
  .hero-actions .btn { width: 100%; }
  .hero-note { display: none; }
  .feature-grid { grid-template-columns: 1fr; }
  .feature-card:nth-child(1), .feature-card:nth-child(2), .feature-card:nth-child(3), .feature-card:nth-child(4) { grid-column: span 1; }
  .carousel-card { flex: 0 0 82%; }
  .carousel-nav { flex-direction: column; align-items: flex-start; gap: 16px; }
  .sysreq-grid { grid-template-columns: 1fr; }
  .spec-card { padding: 8px 16px; }
  .spec-name { width: 70px; font-size: 13px; }
  .spec-value { font-size: 13px; }
  .device-grid { grid-template-columns: 1fr 1fr; }
  .review-wrap { padding: 28px 20px; }
  .reviews-summary { flex-direction: column; align-items: flex-start; gap: 10px; }
  .review-grid { grid-template-columns: 1fr; }
  .download-card { padding: 48px 24px; }
  .download-actions { flex-direction: column; gap: 20px; }
  .download-actions .btn-xl { width: 100%; }
  .security-badges { gap: 16px; }
  .news-card { flex-direction: row; padding: 12px; gap: 12px; }
  .news-thumb { width: 96px; height: 78px; }
  .news-body h3 { font-size: 15px; }
  .news-excerpt { display: none; }
  .news-meta { font-size: 12px; gap: 10px; }
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .footer-bottom { flex-direction: column; text-align: center; justify-content: center; }
  .faq-question { padding: 18px 18px; font-size: 14px; }
  .faq-answer p { padding: 0 16px 18px; margin-left: 18px; padding-left: 14px; font-size: 13px; }
}
@media (max-width: 520px) {
  .brand-text { font-size: 16px; }
  .brand { padding: 6px 8px; }
  .feature-card { padding: 22px 18px; }
  .device-card { padding: 18px 12px; }
  .device-card i { font-size: 24px; }
  .carousel-card { flex: 0 0 88%; }
  .carousel-card p { white-space: normal; }
  .news-thumb { width: 78px; height: 68px; }
  .news-body h3 { font-size: 14px; }
  .news-meta span:last-child { display: none; }
  .btn-lg, .btn-xl { padding: 14px 22px; font-size: 15px; }
}

/* roulang page: category1 */
:root {
  --bg: #0B0F14;
  --surface: #131B24;
  --surface-2: #1B2733;
  --surface-3: #3A4A5E;
  --border: #263242;
  --border-strong: #3A4A5E;
  --text-1: #E8EDF3;
  --text-2: #A3B0BD;
  --text-3: #68788A;
  --primary: #FF6B2C;
  --primary-hover: #FF8540;
  --primary-soft: rgba(255,107,44,.12);
  --accent: #2DD4A7;
  --star: #FFC53D;
  --danger: #FF5C72;
  --radius-card: 18px;
  --radius-btn: 12px;
  --radius-input: 12px;
  --radius-nav: 20px;
  --shadow: 0 2px 8px rgba(0,0,0,.35), 0 8px 24px rgba(0,0,0,.18);
  --shadow-hover: 0 4px 12px rgba(0,0,0,.45), 0 12px 32px rgba(255,107,44,.08);
  --btn-shadow: 0 6px 20px rgba(255,107,44,.35);
  --space-sec: 96px;
  --space-sec-mobile: 64px;
  --font-cn: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --font-num: "Inter", "SF Pro Display", "Segoe UI", sans-serif;
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:var(--font-cn);background:var(--bg);color:var(--text-1);font-size:16px;line-height:1.8;-webkit-font-smoothing:antialiased}
img{max-width:100%;display:block;border:none}
a{color:var(--text-2);text-decoration:none;transition:color .2s ease, background .2s ease, border-color .2s ease, transform .2s ease}
a:hover{color:var(--primary);text-decoration:underline}
a:focus-visible,button:focus-visible{outline:2px solid var(--primary);outline-offset:2px}
button{font-family:var(--font-cn);cursor:pointer;border:none;background:none;color:inherit}
ul,ol{list-style:none}
h1,h2,h3,h4,h5,h6{line-height:1.35;font-weight:700;color:var(--text-1)}
.container{max-width:1200px;margin:0 auto;padding:0 24px}

/* 按钮 */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;font-size:15px;font-weight:600;padding:14px 28px;border-radius:var(--radius-btn);transition:all .2s ease;border:1px solid transparent;cursor:pointer;text-decoration:none;white-space:nowrap;line-height:1}
.btn:active{transform:scale(.98)}
.btn-primary{background:var(--primary);color:#fff;box-shadow:var(--btn-shadow)}
.btn-primary:hover{background:var(--primary-hover);color:#fff;transform:translateY(-2px);text-decoration:none}
.btn-primary:active{transform:scale(.98)}
.btn-outline{background:transparent;border-color:var(--border);color:var(--text-1)}
.btn-outline:hover{border-color:var(--primary);color:var(--primary);text-decoration:none;transform:translateY(-2px)}
.btn-lg{height:56px;padding:0 40px;font-size:17px;font-weight:800;border-radius:14px;background:linear-gradient(135deg,#FF6B2C,#FF9F45)}
.btn-lg:hover{filter:brightness(1.08);background:linear-gradient(135deg,#FF6B2C,#FF9F45);color:#fff}

/* 徽章/标签 */
.badge{display:inline-flex;align-items:center;gap:6px;padding:4px 14px;border-radius:999px;font-size:13px;background:var(--primary-soft);color:var(--primary)}
.section-tag{display:inline-block;padding:6px 16px;border-radius:999px;font-size:13px;font-weight:600;background:var(--primary-soft);color:var(--primary);letter-spacing:.5px}

/* 导航 */
.site-header{position:relative;z-index:100;padding-top:16px}
.nav-panel{background:#10161E;border:1px solid #1F2A36;border-radius:var(--radius-nav);padding:8px;display:flex;align-items:center;gap:24px;box-shadow:var(--shadow)}
.brand{display:flex;align-items:center;gap:10px;flex-shrink:0;text-decoration:none;padding:6px 12px;border-radius:12px}
.brand:hover{text-decoration:none;background:rgba(255,255,255,.03)}
.brand-icon{width:38px;height:38px;border-radius:10px;background:linear-gradient(135deg,var(--primary),#FF9F45);display:flex;align-items:center;justify-content:center;color:#fff;font-size:18px;box-shadow:0 4px 12px rgba(255,107,44,.3)}
.brand-text{font-size:20px;font-weight:800;color:var(--text-1);letter-spacing:.5px}
.main-nav{display:flex;align-items:center;gap:8px;flex:1;justify-content:center}
.nav-item{display:inline-flex;flex-direction:column;align-items:center;justify-content:center;gap:2px;min-width:92px;padding:10px 14px;border-radius:12px;background:#1A2532;font-size:13px;font-weight:600;color:var(--text-2);text-decoration:none;transition:all .2s ease;position:relative}
.nav-item i{font-size:16px}
.nav-item span{font-size:13px;line-height:1.2}
.nav-item:hover{background:#2A3543;color:var(--text-1);text-decoration:none;transform:translateY(-1px)}
.nav-item.active{background:#2A3543;color:var(--text-1)}
.nav-item.active::after{content:"";position:absolute;bottom:4px;left:50%;transform:translateX(-50%);width:20px;height:2px;border-radius:2px;background:var(--primary)}
.nav-cta{margin-left:auto;padding:12px 22px;font-size:14px;flex-shrink:0}
.nav-toggle{display:none;width:44px;height:44px;border-radius:12px;background:var(--surface-2);color:var(--text-1);font-size:18px;align-items:center;justify-content:center;transition:background .2s ease;border:1px solid var(--border)}
.nav-toggle:hover{background:var(--border);color:var(--primary)}

/* 面包屑 */
.breadcrumb-wrap{padding:18px 0 0}
.breadcrumb{display:flex;align-items:center;gap:8px;font-size:13px;color:var(--text-3)}
.breadcrumb a{color:var(--text-3)}
.breadcrumb a:hover{color:var(--primary)}
.breadcrumb i{font-size:10px;color:var(--text-3)}

/* 分类 Hero */
.category-hero{position:relative;border-radius:24px;overflow:hidden;margin:24px 0 0;background:url('/assets/images/backpic/back-1.webp') center/cover no-repeat;min-height:420px;display:flex;align-items:center}
.category-hero::before{content:"";position:absolute;inset:0;background:linear-gradient(100deg,rgba(11,15,20,.96) 10%,rgba(11,15,20,.72) 55%,rgba(11,15,20,.35));z-index:1}
.category-hero .container{position:relative;z-index:2;padding-top:64px;padding-bottom:64px}
.hero-badge{display:inline-flex;align-items:center;gap:8px;padding:6px 18px;border-radius:999px;background:var(--primary-soft);color:var(--primary);font-size:13px;font-weight:600;margin-bottom:20px}
.hero-badge i{font-size:14px}
.category-hero h1{font-size:clamp(2rem,4.5vw,3.2rem);font-weight:800;line-height:1.25;color:var(--text-1);margin-bottom:18px}
.hero-sub{font-size:17px;color:var(--text-2);max-width:52ch;line-height:1.8;margin-bottom:32px}
.hero-actions{display:flex;gap:16px;flex-wrap:wrap}
.hero-vert{position:absolute;right:32px;bottom:40px;z-index:2;writing-mode:vertical-rl;font-size:13px;letter-spacing:4px;color:rgba(255,255,255,.85);text-shadow:0 2px 10px rgba(0,0,0,.5)}

/* 分类描述 */
.intro-section{padding:48px 0 8px}
.intro-text{font-size:16px;color:var(--text-2);background:var(--surface);border:1px solid var(--border);border-left:4px solid var(--primary);border-radius:var(--radius-card);padding:20px 28px;max-width:900px}

/* 区块通用 */
.section{padding:var(--space-sec) 0}
.section-heading{margin-bottom:40px;text-align:center}
.section-heading .section-tag{margin-bottom:14px}
.section-heading h2{font-size:clamp(1.4rem,3vw,2.1rem);font-weight:700;margin-top:14px}

/* 特色（错落布局） */
.features-section{padding:var(--space-sec) 0}
.features-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.feature-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-card);padding:26px 24px;position:relative;overflow:hidden;transition:all .25s ease;min-height:180px}
.feature-card::before{content:"";position:absolute;left:0;top:0;bottom:0;width:3px;background:var(--primary);opacity:0;transition:opacity .25s ease}
.feature-card:hover{box-shadow:var(--shadow-hover);transform:translateY(-4px);border-color:var(--surface-3)}
.feature-card:hover::before{opacity:1}
.feature-icon{width:48px;height:48px;border-radius:12px;display:flex;align-items:center;justify-content:center;font-size:20px;background:var(--surface-2);color:var(--text-2);margin-bottom:16px;transition:all .2s ease}
.feature-card:hover .feature-icon{color:var(--primary);background:var(--primary-soft)}
.feature-card h3{font-size:1.15rem;font-weight:700;margin-bottom:8px}
.feature-card p{font-size:14px;color:var(--text-2);line-height:1.7}
.feature-card:nth-child(1){grid-column:span 1}
.feature-card:nth-child(2){grid-column:span 1}
.feature-card:nth-child(3){grid-column:span 2}
.feature-card:nth-child(4){grid-column:span 1}

/* 热门游戏卡（横向列表） */
.games-section{padding:var(--space-sec) 0;background:linear-gradient(180deg,var(--bg) 0%,#0F1420 50%,var(--bg) 100%)}
.games-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:24px}
.game-card{display:flex;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-card);overflow:hidden;transition:all .25s ease;align-items:stretch}
.game-card:hover{transform:translateY(-2px);border-color:var(--border-strong);box-shadow:var(--shadow-hover)}
.game-thumb{width:168px;flex-shrink:0;position:relative;overflow:hidden}
.game-thumb img{width:100%;height:100%;object-fit:cover;transition:transform .4s ease}
.game-card:hover .game-thumb img{transform:scale(1.04)}
.game-type{position:absolute;left:10px;top:10px;padding:3px 10px;border-radius:999px;background:rgba(11,15,20,.82);color:var(--text-1);font-size:12px;font-weight:600;backdrop-filter:blur(4px)}
.game-info{flex:1;padding:18px 20px;display:flex;flex-direction:column}
.game-info h3{font-size:1.05rem;font-weight:700;margin-bottom:6px}
.game-info>p{font-size:13px;color:var(--text-2);line-height:1.6;margin-bottom:12px;flex:1}
.game-meta{display:flex;align-items:center;gap:16px;font-size:13px;color:var(--text-3)}
.rating{color:var(--star);font-weight:600}
.play-btn{margin-left:auto;padding:6px 16px;border-radius:999px;background:var(--primary-soft);color:var(--primary);font-size:13px;font-weight:600;transition:all .2s ease;text-decoration:none}
.play-btn:hover{background:var(--primary);color:#fff;text-decoration:none}

/* 适用场景 */
.scenarios-section{padding:var(--space-sec) 0}
.scenarios-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.scenario-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-card);padding:28px 24px;text-align:center;transition:all .25s ease}
.scenario-card:hover{transform:translateY(-4px);border-color:var(--primary);box-shadow:var(--shadow-hover)}
.scenario-icon{width:56px;height:56px;border-radius:16px;background:var(--surface-2);color:var(--primary);display:flex;align-items:center;justify-content:center;font-size:22px;margin:0 auto 16px;transition:all .25s ease}
.scenario-card:hover .scenario-icon{background:var(--primary);color:#fff}
.scenario-card h3{font-size:1rem;font-weight:700;margin-bottom:6px}
.scenario-card p{font-size:13px;color:var(--text-2);line-height:1.6}

/* 流程 */
.steps-section{padding:var(--space-sec) 0;background:linear-gradient(180deg,var(--bg) 0%,#0F1420 100%)}
.steps-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;position:relative}
.steps-grid::before{content:"";position:absolute;top:44px;left:12%;right:12%;height:2px;background:linear-gradient(90deg,var(--primary) 0%,rgba(255,107,44,.3) 100%);border-radius:2px}
.step-card{position:relative;text-align:center;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-card);padding:32px 24px;z-index:1;transition:all .25s ease}
.step-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-hover);border-color:var(--border-strong)}
.step-num{width:32px;height:32px;border-radius:50%;background:var(--primary);color:#fff;font-size:15px;font-weight:700;display:flex;align-items:center;justify-content:center;margin:0 auto 16px;box-shadow:0 4px 12px rgba(255,107,44,.35);font-family:var(--font-num)}
.step-card h3{font-size:1rem;font-weight:700;margin-bottom:8px}
.step-card p{font-size:13px;color:var(--text-2);line-height:1.6}

/* FAQ */
.faq-section{padding:var(--space-sec) 0}
.faq-list{max-width:820px;margin:0 auto;display:flex;flex-direction:column;gap:16px}
.faq-item{background:var(--surface);border:1px solid var(--border);border-radius:18px;overflow:hidden;transition:all .25s ease}
.faq-item:hover{border-color:var(--border-strong)}
.faq-item.open{background:var(--surface-2);border-color:var(--border-strong)}
.faq-question{display:flex;align-items:center;justify-content:space-between;width:100%;padding:20px 24px;font-size:15px;font-weight:600;color:var(--text-1);cursor:pointer;transition:background .2s ease;gap:16px}
.faq-question:hover{color:var(--primary)}
.faq-question i{font-size:18px;color:var(--text-3);transition:transform .3s ease;flex-shrink:0}
.faq-item.open .faq-question i{transform:rotate(45deg);color:var(--primary)}
.faq-answer{max-height:0;overflow:hidden;transition:max-height .3s ease}
.faq-answer-inner{padding:0 24px 20px 24px;border-left:3px solid var(--accent);margin:0 24px 20px 24px;padding-left:16px}
.faq-answer-inner p{font-size:14px;color:var(--text-2);line-height:1.8}
.faq-item.open .faq-answer{max-height:500px}

/* CTA */
.cta-section{padding:32px 0 var(--space-sec)}
.cta-box{position:relative;border-radius:24px;overflow:hidden;padding:56px 48px;background:url('/assets/images/backpic/back-2.png') center/cover no-repeat;display:flex;align-items:center;justify-content:space-between;gap:32px;border:1px solid var(--border)}
.cta-box::before{content:"";position:absolute;inset:0;background:linear-gradient(100deg,rgba(11,15,20,.97) 20%,rgba(11,15,20,.8) 80%)}
.cta-box>*{position:relative;z-index:1}
.cta-info h2{font-size:clamp(1.3rem,2.5vw,2rem);font-weight:800;margin-bottom:8px}
.cta-info p{font-size:15px;color:var(--text-2)}
.cta-info .cta-note{margin-top:14px;font-size:13px;color:var(--text-3)}
.cta-note span{margin-right:20px;display:inline-flex;align-items:center;gap:6px}
.cta-note i{color:var(--accent)}

/* 页脚 */
.site-footer{background:var(--surface);border-top:1px solid var(--border);padding:72px 0 0;margin-top:0}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1.2fr;gap:40px;padding-bottom:48px}
.footer-brand p{font-size:14px;color:var(--text-2);line-height:1.8;margin:16px 0}
.footer-logo{display:inline-flex;align-items:center;gap:10px;font-size:20px;font-weight:800;color:var(--text-1);text-decoration:none}
.footer-logo:hover{text-decoration:none}
.social-icons{display:flex;gap:12px;margin-top:8px}
.social-icons a{width:38px;height:38px;border-radius:10px;background:var(--surface-2);border:1px solid var(--border);display:flex;align-items:center;justify-content:center;color:var(--text-2);font-size:16px;transition:all .2s ease}
.social-icons a:hover{background:var(--primary);border-color:var(--primary);color:#fff;transform:translateY(-2px)}
.footer-col h4{font-size:15px;font-weight:700;color:var(--text-1);margin-bottom:18px}
.footer-col a{display:block;padding:5px 0;font-size:14px;color:var(--text-2)}
.footer-col a:hover{color:var(--primary)}
.footer-col p{font-size:14px;color:var(--text-2);line-height:1.9}
.footer-bottom{border-top:1px solid rgba(255,255,255,.06);padding:20px 0;display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap}
.footer-bottom p{font-size:13px;color:var(--text-3)}

/* 响应式 */
@media (max-width:1079px) {
  .main-nav{justify-content:flex-start;overflow-x:auto;gap:6px}
  .nav-item{min-width:84px;padding:10px 10px}
  .scenarios-grid{grid-template-columns:repeat(2,1fr)}
  .games-grid{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr 1fr;gap:32px}
}
@media (max-width:767px) {
  .container{padding:0 16px}
  .section{padding:var(--space-sec-mobile) 0}
  .nav-panel{flex-wrap:wrap;gap:12px}
  .brand-text{font-size:18px}
  .main-nav{display:none;width:100%;flex-direction:column;background:#10161E;border-radius:16px;padding:12px;gap:8px}
  .main-nav.open{display:flex;animation:fadeIn .25s ease}
  .nav-item{width:100%;flex-direction:row;justify-content:flex-start;gap:12px;min-width:auto;padding:12px 16px}
  .nav-item.active::after{left:0;bottom:auto;top:50%;transform:translateY(-50%);width:3px;height:20px}
  .nav-cta{display:none}
  .nav-toggle{display:flex;margin-left:auto;order:3}
  .brand{order:1}
  .category-hero{min-height:380px}
  .category-hero .container{padding-top:48px;padding-bottom:48px}
  .hero-vert{display:none}
  .hero-actions .btn{width:100%;justify-content:center}
  .features-grid{grid-template-columns:1fr 1fr}
  .feature-card:nth-child(3){grid-column:span 2}
  .feature-card:nth-child(4){grid-column:span 2}
  .feature-card{padding:22px 18px;min-height:150px}
  .game-card{flex-direction:column}
  .game-thumb{width:100%;height:120px}
  .scenarios-grid{grid-template-columns:1fr 1fr}
  .steps-grid{grid-template-columns:1fr}
  .steps-grid::before{display:none}
  .cta-box{flex-direction:column;text-align:center;padding:40px 24px}
  .cta-box .btn-lg{width:100%}
  .footer-grid{grid-template-columns:1fr}
  .footer-bottom{flex-direction:column;text-align:center;justify-content:center}
  .breadcrumb-wrap{overflow-x:auto}
}
@media (max-width:520px) {
  .features-grid{grid-template-columns:1fr}
  .feature-card:nth-child(3){grid-column:span 1}
  .feature-card:nth-child(4){grid-column:span 1}
  .scenarios-grid{grid-template-columns:1fr}
}
@keyframes fadeIn{from{opacity:0;transform:translateY(-8px)}to{opacity:1;transform:translateY(0)}}

/* roulang page: article */
/* ===== Design System ===== */
        :root {
            --bg: #0B0F14;
            --surface: #131B24;
            --surface-2: #1B2733;
            --border: #263242;
            --text-1: #E8EDF3;
            --text-2: #A3B0BD;
            --text-3: #68788A;
            --primary: #FF6B2C;
            --primary-hover: #FF8540;
            --primary-soft: rgba(255, 107, 44, .12);
            --accent: #2DD4A7;
            --star: #FFC53D;
            --danger: #FF5C72;
            --radius-card: 18px;
            --radius-btn: 12px;
            --shadow-card: 0 2px 8px rgba(0, 0, 0, .35), 0 8px 24px rgba(0, 0, 0, .18);
            --shadow-hover: 0 4px 12px rgba(0, 0, 0, .45), 0 12px 32px rgba(255, 107, 44, .08);
            --font-cn: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
            --font-num: "Inter", "SF Pro Display", "Segoe UI", sans-serif;
        }

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

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: var(--font-cn);
            background: var(--bg);
            color: var(--text-2);
            line-height: 1.8;
            -webkit-font-smoothing: antialiased;
        }

        a {
            color: inherit;
            text-decoration: none;
        }

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

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

        ul {
            list-style: none;
        }

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

        .container--narrow {
            max-width: 820px;
            margin: 0 auto;
        }

        /* ===== Buttons ===== */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 10px 20px;
            border: 1px solid transparent;
            border-radius: var(--radius-btn);
            font-size: 14px;
            font-weight: 600;
            line-height: 1.4;
            text-decoration: none;
            cursor: pointer;
            transition: background .2s ease, color .2s ease, border-color .2s ease, box-shadow .2s ease, transform .2s ease;
        }

        .btn-primary {
            background: var(--primary);
            color: #fff;
            box-shadow: 0 6px 20px rgba(255, 107, 44, .35);
        }

        .btn-primary:hover {
            background: var(--primary-hover);
            box-shadow: 0 8px 24px rgba(255, 107, 44, .45);
            transform: translateY(-2px);
        }

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

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

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

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

        .btn-lg {
            padding: 16px 40px;
            font-size: 16px;
            border-radius: 14px;
        }

        .btn:focus-visible {
            outline: 2px solid var(--primary);
            outline-offset: 2px;
            box-shadow: 0 0 0 4px rgba(255, 107, 44, .25);
        }

        /* ===== Header / Nav Panel ===== */
        .site-header {
            position: relative;
            z-index: 100;
            background: var(--bg);
            padding-top: 16px;
        }

        .nav-panel {
            display: flex;
            align-items: center;
            gap: 14px;
            background: #10161E;
            border: 1px solid #1F2A36;
            border-radius: 20px;
            padding: 8px 12px;
            box-shadow: 0 2px 12px rgba(0, 0, 0, .25);
        }

        .brand {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            text-decoration: none;
            flex-shrink: 0;
        }

        .brand-icon {
            width: 36px;
            height: 36px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            background: linear-gradient(135deg, #FF6B2C, #FF9F45);
            border-radius: 10px;
            color: #fff;
            font-size: 16px;
            transition: transform .2s ease;
        }

        .brand:hover .brand-icon {
            transform: rotate(-8deg) scale(1.05);
        }

        .brand-text {
            font-size: 18px;
            font-weight: 800;
            color: var(--text-1);
            letter-spacing: .02em;
            white-space: nowrap;
        }

        .main-nav {
            display: flex;
            align-items: center;
            gap: 8px;
            flex: 1;
        }

        .nav-item {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 10px 14px;
            border-radius: 12px;
            background: #1A2532;
            text-decoration: none;
            color: var(--text-2);
            font-size: 14px;
            font-weight: 600;
            transition: background .2s ease, color .2s ease;
            border: 1px solid transparent;
            border-bottom: 2px solid transparent;
        }

        .nav-item i {
            font-size: 14px;
        }

        .nav-item:hover {
            background: #2A3543;
            color: var(--text-1);
        }

        .nav-item.active {
            background: #2A3543;
            color: var(--text-1);
            border-bottom-color: var(--primary);
        }

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

        .nav-cta {
            flex-shrink: 0;
        }

        .nav-toggle {
            display: none;
            width: 40px;
            height: 40px;
            border-radius: 10px;
            border: 1px solid var(--border);
            background: var(--surface);
            color: var(--text-1);
            align-items: center;
            justify-content: center;
            font-size: 16px;
            cursor: pointer;
            transition: border-color .2s ease, background .2s ease;
        }

        .nav-toggle:hover {
            border-color: var(--primary);
        }

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

        /* ===== Article Banner ===== */
        .article-banner {
            position: relative;
            padding: 80px 0 96px;
            background-position: center;
            background-size: cover;
            background-repeat: no-repeat;
        }

        .article-banner::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(100deg, rgba(11, 15, 20, .97) 0%, rgba(11, 15, 20, .82) 55%, rgba(11, 15, 20, .55) 100%);
        }

        .article-banner .container {
            position: relative;
            z-index: 1;
        }

        .breadcrumb {
            display: flex;
            align-items: center;
            flex-wrap: wrap;
            gap: 8px;
            margin-bottom: 36px;
            font-size: 13px;
            color: var(--text-3);
        }

        .breadcrumb a {
            color: var(--text-2);
            text-decoration: none;
            transition: color .2s ease;
        }

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

        .breadcrumb .separator {
            color: var(--text-3);
        }

        .breadcrumb .current {
            color: var(--text-1);
            max-width: 50ch;
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
        }

        .article-title {
            font-size: clamp(2rem, 4.5vw, 3.2rem);
            font-weight: 800;
            line-height: 1.25;
            color: var(--text-1);
            margin-bottom: 22px;
            max-width: 20em;
            letter-spacing: .01em;
        }

        .article-meta {
            display: flex;
            flex-wrap: wrap;
            gap: 24px;
            font-size: 13px;
            color: var(--text-3);
        }

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

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

        /* ===== Article Main ===== */
        .article-main {
            padding: 48px 0 64px;
        }

        .article-body {
            max-width: 780px;
            margin: 0 auto;
            background: var(--surface);
            border: 1px solid var(--border);
            border-radius: 24px;
            padding: 48px 56px 56px;
            box-shadow: var(--shadow-card);
        }

        .article-content {
            font-size: 16px;
            line-height: 1.95;
            color: var(--text-2);
        }

        .article-content > *:first-child {
            margin-top: 0;
        }

        .article-content h2 {
            font-size: 1.75rem;
            font-weight: 700;
            color: var(--text-1);
            line-height: 1.35;
            margin: 2em 0 .8em;
            padding-left: 16px;
            border-left: 3px solid var(--primary);
        }

        .article-content h3 {
            font-size: 1.25rem;
            font-weight: 700;
            color: var(--text-1);
            margin: 1.6em 0 .8em;
        }

        .article-content p {
            margin-bottom: 1.2em;
        }

        .article-content a {
            color: var(--primary);
            text-decoration: underline;
            text-underline-offset: 4px;
            transition: color .2s ease;
        }

        .article-content a:hover {
            color: var(--primary-hover);
        }

        .article-content ul,
        .article-content ol {
            margin: 0 0 1.2em;
            padding-left: 1.5em;
        }

        .article-content ul li {
            list-style: disc;
        }

        .article-content ol li {
            list-style: decimal;
        }

        .article-content blockquote {
            position: relative;
            background: #101820;
            border-left: 3px solid var(--accent);
            border-radius: 12px;
            padding: 20px 24px;
            margin: 1.6em 0;
            color: var(--text-2);
        }

        .article-content blockquote > *:last-child {
            margin-bottom: 0;
        }

        .article-content code {
            font-size: 13px;
            background: var(--surface-2);
            border-radius: 4px;
            padding: 2px 6px;
            font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
            color: var(--accent);
        }

        .article-content pre {
            background: var(--surface-2);
            border: 1px solid var(--border);
            border-radius: 12px;
            padding: 20px;
            margin: 1.6em 0;
            overflow-x: auto;
        }

        .article-content pre code {
            background: transparent;
            padding: 0;
            color: var(--text-1);
        }

        .article-content img {
            max-width: 100%;
            height: auto;
            border-radius: 16px;
            border: 1px solid var(--border);
            margin: 1.4em 0;
        }

        @media (min-width: 768px) {
            .article-content img {
                width: calc(100% + 48px);
                max-width: none;
                margin-left: -24px;
                margin-right: -24px;
            }
        }

        .article-content table {
            width: 100%;
            border-collapse: collapse;
            margin: 1.4em 0;
            font-size: 14px;
        }

        .article-content th,
        .article-content td {
            padding: 10px 14px;
            border: 1px solid var(--border);
            text-align: left;
        }

        .article-content th {
            background: var(--surface-2);
            color: var(--text-1);
            font-weight: 700;
        }

        .article-content h2::before,
        .article-content h3::before {
            /* placeholder for heading tags */
        }

        .article-back {
            max-width: 780px;
            margin: 28px auto 0;
            text-align: center;
        }

        .article-back a {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            color: var(--text-2);
            text-decoration: none;
            font-size: 14px;
            padding: 8px 20px;
            border-radius: 12px;
            transition: color .2s ease, background .2s ease, border-color .2s ease;
            border: 1px solid transparent;
        }

        .article-back a:hover {
            color: var(--primary);
            background: var(--primary-soft);
            border-color: var(--primary);
        }

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

        /* ===== Article Empty ===== */
        .article-empty {
            text-align: center;
            padding: 70px 20px;
        }

        .article-empty i {
            font-size: 56px;
            color: var(--text-3);
            margin-bottom: 20px;
            display: block;
        }

        .article-empty p {
            font-size: 18px;
            color: var(--text-2);
            margin-bottom: 24px;
        }

        /* ===== Related Section ===== */
        .related-section {
            padding: 0 0 80px;
        }

        .section-head {
            display: flex;
            align-items: flex-end;
            justify-content: space-between;
            gap: 24px;
            margin-bottom: 32px;
        }

        .section-head h2 {
            font-size: 1.75rem;
            font-weight: 800;
            color: var(--text-1);
            position: relative;
            padding-left: 16px;
            border-left: 3px solid var(--primary);
        }

        .section-head p {
            font-size: 13px;
            color: var(--text-3);
            max-width: 40em;
        }

        .related-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 20px;
        }

        .related-card {
            display: flex;
            align-items: center;
            gap: 16px;
            background: var(--surface);
            border: 1px solid var(--border);
            border-radius: var(--radius-card);
            padding: 12px;
            text-decoration: none;
            transition: transform .2s ease, border-color .2s ease, box-shadow .2s ease, background .2s ease;
        }

        .related-card:hover {
            transform: translateY(-4px);
            border-color: var(--primary);
            box-shadow: var(--shadow-hover);
            background: var(--surface-2);
        }

        .related-card:active {
            transform: scale(.98);
        }

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

        .related-card .r-card-cover {
            flex-shrink: 0;
            width: 128px;
            height: 84px;
            background-size: cover;
            background-position: center;
            border-radius: 12px;
            border: 1px solid var(--border);
        }

        .r-card-body {
            overflow: hidden;
        }

        .r-card-body h3 {
            font-size: 15px;
            font-weight: 700;
            color: var(--text-1);
            margin-bottom: 6px;
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
        }

        .r-card-body p {
            font-size: 13px;
            color: var(--text-2);
            line-height: 1.5;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }

        /* ===== CTA Section ===== */
        .cta-section {
            padding: 0 0 80px;
        }

        .cta-banner {
            position: relative;
            border-radius: 24px;
            padding: 64px 56px;
            background-size: cover;
            background-position: center;
            overflow: hidden;
            box-shadow: var(--shadow-card);
            border: 1px solid var(--border);
        }

        .cta-overlay {
            position: absolute;
            inset: 0;
            background: linear-gradient(100deg, rgba(11, 15, 20, .95) 0%, rgba(11, 15, 20, .72) 100%);
        }

        .cta-inner {
            position: relative;
            z-index: 1;
            text-align: center;
        }

        .cta-inner h2 {
            font-size: clamp(1.5rem, 3vw, 2rem);
            font-weight: 800;
            color: var(--text-1);
            margin-bottom: 12px;
        }

        .cta-inner p {
            font-size: 15px;
            color: var(--text-2);
            max-width: 52ch;
            margin: 0 auto 28px;
        }

        .cta-actions {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 16px;
            flex-wrap: wrap;
            margin-bottom: 22px;
        }

        .cta-meta {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 12px;
            flex-wrap: wrap;
            font-size: 13px;
            color: var(--text-3);
        }

        .cta-meta span {
            white-space: nowrap;
        }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--bg);
            border-top: 1px solid rgba(255, 255, 255, .06);
            padding: 64px 0 0;
        }

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

        .footer-brand .footer-logo {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            font-size: 20px;
            font-weight: 800;
            color: var(--text-1);
            text-decoration: none;
            margin-bottom: 16px;
        }

        .footer-brand p {
            font-size: 13px;
            color: var(--text-3);
            line-height: 1.8;
            max-width: 32em;
            margin-bottom: 20px;
        }

        .social-icons {
            display: flex;
            gap: 12px;
        }

        .social-icons a {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 36px;
            height: 36px;
            border-radius: 10px;
            border: 1px solid var(--border);
            background: var(--surface);
            color: var(--text-3);
            font-size: 14px;
            text-decoration: none;
            transition: color .2s ease, border-color .2s ease, background .2s ease, transform .2s ease;
        }

        .social-icons a:hover {
            color: var(--primary);
            border-color: var(--primary);
            background: var(--primary-soft);
            transform: translateY(-2px);
        }

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

        .footer-col h4 {
            font-size: 15px;
            font-weight: 700;
            color: var(--text-1);
            margin-bottom: 16px;
        }

        .footer-col p {
            font-size: 13px;
            color: var(--text-3);
            line-height: 1.8;
            margin-bottom: 8px;
        }

        .footer-col a {
            display: block;
            font-size: 13px;
            color: var(--text-2);
            text-decoration: none;
            margin-bottom: 10px;
            transition: color .2s ease;
        }

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

        .footer-col a:focus-visible {
            outline: 2px solid var(--primary);
            outline-offset: 2px;
            border-radius: 4px;
        }

        .footer-bottom {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 10px;
            border-top: 1px solid rgba(255, 255, 255, .06);
            padding: 24px 0;
            font-size: 13px;
            color: var(--text-3);
        }

        .footer-bottom p {
            font-size: 13px;
            color: var(--text-3);
        }

        /* ===== Responsive ===== */
        @media (max-width: 1079px) {
            .container {
                padding: 0 20px;
            }

            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 36px;
            }

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

            .related-grid .related-card:last-child {
                grid-column: span 2;
            }

            .article-banner {
                padding: 64px 0 80px;
            }
        }

        @media (max-width: 767px) {
            .container {
                padding: 0 16px;
            }

            .nav-panel {
                gap: 8px;
            }

            .brand-text {
                font-size: 16px;
            }

            .brand-icon {
                width: 32px;
                height: 32px;
                font-size: 14px;
            }

            .nav-toggle {
                display: inline-flex;
            }

            .main-nav {
                display: none;
                position: absolute;
                top: calc(100% + 8px);
                left: 16px;
                right: 16px;
                background: var(--surface);
                border: 1px solid var(--border);
                border-radius: 16px;
                padding: 12px;
                flex-direction: column;
                gap: 8px;
                z-index: 20;
                box-shadow: var(--shadow-card);
            }

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

            .nav-item {
                justify-content: center;
            }

            .nav-cta {
                display: none;
            }

            .article-banner {
                padding: 44px 0 56px;
            }

            .breadcrumb {
                margin-bottom: 24px;
                font-size: 12px;
            }

            .article-title {
                font-size: 1.75rem;
                line-height: 1.3;
            }

            .article-meta {
                gap: 10px 16px;
                font-size: 12px;
            }

            .article-main {
                padding: 32px 0 48px;
            }

            .article-body {
                padding: 28px 20px 36px;
                border-radius: 18px;
            }

            .article-content {
                font-size: 15px;
                line-height: 1.85;
            }

            .article-content h2 {
                font-size: 1.4rem;
            }

            .article-content h3 {
                font-size: 1.15rem;
            }

            .related-section {
                padding-bottom: 48px;
            }

            .section-head {
                flex-direction: column;
                align-items: flex-start;
                gap: 8px;
                margin-bottom: 24px;
            }

            .related-grid {
                grid-template-columns: 1fr;
                gap: 12px;
            }

            .related-grid .related-card:last-child {
                grid-column: span 1;
            }

            .cta-section {
                padding-bottom: 48px;
            }

            .cta-banner {
                padding: 36px 20px;
                border-radius: 18px;
            }

            .cta-inner h2 {
                font-size: 1.4rem;
            }

            .cta-actions {
                flex-direction: column;
                align-items: stretch;
                gap: 12px;
            }

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

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

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