/*
* Crystal Marine / Oceanic Flow Theme
* Primary: Ocean Blue (#0284c7)
* Accent: Aqua Cyan (#06b6d4)
* CTA: Coral (#f97316)
* Base: White (#ffffff)
* Hero BG: Dark Ocean Gradient (#071e3d -> #0c3d69)
*/

:root {
  --blue: #0284c7;
  --cyan: #06b6d4;
  --coral: #f97316;
  --white: #ffffff;
  --slate-900: #0f172a;
  --slate-800: #1e293b;
  --slate-700: #334155;
  --slate-600: #475569;
  --slate-500: #64748b;
  --slate-400: #94a3b8;
  --slate-300: #cbd5e1;
  --slate-200: #e2e8f0;
  --slate-100: #f1f5f9;
  --slate-50: #f8fafc;
  --ocean-dark: #071e3d;
  --ocean-light: #0c3d69;
  --blue-deeper: #075985;
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji';
}

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

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--slate-700);
  background-color: var(--white);
  -webkit-font-smoothing: antialiased;
}

img, svg {
  max-width: 100%;
  height: auto;
  vertical-align: middle;
}

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

a:hover {
  text-decoration: underline;
}

.wrap {
  width: 100%;
  max-width: 1200px;
  margin-left: auto;
  margin-right: auto;
  padding-left: 20px;
  padding-right: 20px;
}

.sec {
  padding: 80px 0;
}

.sec-alt {
  background-color: var(--slate-50);
}

.sec-ocean {
  background-color: var(--ocean-dark);
  color: var(--slate-300);
}

.sec-ocean2 {
  background: linear-gradient(180deg, var(--ocean-dark) 0%, var(--slate-900) 100%);
  color: var(--slate-300);
}

.sec-head {
  text-align: center;
  margin-bottom: 60px;
}

.sec-tag {
  display: inline-block;
  padding: 4px 12px;
  border-radius: 99px;
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 12px;
}

.sec-tag-coral {
  background-color: #fff1eb;
  color: var(--coral);
}

.sec-tag-cyan {
  background-color: #ecfeff;
  color: var(--cyan);
}

.sec-tag-blue {
  background-color: #dbeafe;
  color: #2563eb;
}

.sec-tag-white {
  background-color: rgba(255,255,255,0.1);
  color: var(--white);
}

.sec-title {
  font-size: 36px;
  font-weight: 700;
  color: var(--slate-900);
  margin: 0 0 16px;
}

.sec-title.light {
  color: var(--white);
}

.sec-sub {
  font-size: 18px;
  max-width: 600px;
  margin: 0 auto;
  color: var(--slate-600);
}

.sec-sub.light {
  color: var(--slate-300);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 24px;
  border: 1px solid transparent;
  border-radius: 8px;
  font-size: 16px;
  font-weight: 600;
  text-align: center;
  cursor: pointer;
  transition: all 0.2s ease;
  white-space: nowrap;
  text-decoration: none;
  background: none;
}

.btn:hover {
  text-decoration: none;
}

.btn-lg { padding: 14px 32px; font-size: 18px; border-radius: 10px; }
.btn-sm { padding: 6px 16px; font-size: 14px; border-radius: 6px; }

.btn-blue {
  background-color: var(--blue);
  color: var(--white);
  box-shadow: 0 4px 14px rgba(2, 132, 199, 0.25);
}
.btn-blue:hover { background-color: #0369a1; transform: translateY(-2px); }

.btn-coral {
  background-color: var(--coral);
  color: var(--white);
  box-shadow: 0 4px 14px rgba(249, 115, 22, 0.25);
}
.btn-coral:hover { background-color: #c2410c; transform: translateY(-2px); }

.btn-cyan {
  background-color: var(--cyan);
  color: var(--white);
}
.btn-cyan:hover { background-color: #0891b2; }

.btn-outline {
  border-color: var(--slate-300);
  color: var(--slate-700);
}
.btn-outline:hover { background-color: var(--slate-100); }

.btn-outline-w {
  border-color: var(--slate-500);
  color: var(--white);
}
.btn-outline-w:hover { background-color: var(--slate-700); border-color: var(--slate-700); }

.btn-white {
  background-color: var(--white);
  color: var(--blue);
}
.btn-white:hover { background-color: var(--slate-100); }

/* Animation */
@keyframes spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

/* Header */
.site-nav {
  position: sticky;
  top: 0;
  width: 100%;
  padding: 12px 0;
  background-color: rgba(255,255,255,0.8);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--slate-200);
  z-index: 100;
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-brand {
  display: flex;
  align-items: center;
  font-size: 20px;
  font-weight: 700;
  color: var(--slate-900);
  text-decoration: none;
}

.nav-brand:hover {
  text-decoration: none;
}

.nav-brand svg {
  width: 32px;
  height: 32px;
  margin-right: 8px;
}

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

.nav-link {
  padding: 8px 16px;
  font-weight: 500;
  color: var(--slate-600);
  border-radius: 99px;
  transition: all 0.2s ease;
}

.nav-link:hover {
  color: var(--slate-900);
  background-color: var(--slate-100);
  text-decoration: none;
}

.nav-link.on {
  color: var(--blue);
  background-color: #e0f2fe;
  font-weight: 600;
}

.nav-dl {
  margin-left: 16px;
}

/* Hero */
.hero {
  padding: 80px 0;
  background: linear-gradient(160deg, var(--ocean-dark) 0%, var(--ocean-light) 100%);
  color: var(--white);
  overflow: hidden;
}

.hero-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.hero-eyebrow {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  font-weight: 600;
  color: var(--cyan);
  margin-bottom: 16px;
}

.hero-eyebrow-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--cyan);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

.hero-title {
  font-size: 52px;
  font-weight: 800;
  line-height: 1.2;
  margin: 0 0 20px;
  letter-spacing: -1px;
}

.hl { color: var(--cyan); }
.hl2 { color: var(--coral); }

.hero-desc {
  font-size: 18px;
  color: var(--slate-300);
  max-width: 480px;
  margin-bottom: 32px;
}

.hero-btns {
  display: flex;
  gap: 16px;
  align-items: center;
}

.hero-trust {
  display: flex;
  align-items: center;
  gap: 24px;
  margin-top: 40px;
  color: var(--slate-400);
  font-size: 14px;
}

.hero-trust-item {
  display: flex;
  align-items: center;
  gap: 8px;
}

.hero-trust-item svg { width: 16px; height: 16px; }

.hero-visual {
  position: relative;
}

.browser-mock {
  background-color: #0f2c4d;
  border: 1px solid var(--slate-700);
  border-radius: 12px;
  box-shadow: 0 25px 50px -12px rgba(0,0,0,0.5);
  overflow: hidden;
}

.bm-bar {
  padding: 10px;
  display: flex;
  align-items: center;
  gap: 6px;
  border-bottom: 1px solid var(--slate-700);
}

.bm-dot { width: 12px; height: 12px; border-radius: 50%; }
.bm-dot.r { background-color: #ff5f57; }
.bm-dot.y { background-color: #ffbd2e; }
.bm-dot.g { background-color: #28c940; }

.bm-body {
  padding: 20px;
}

.bm-cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.bm-card {
  background-color: var(--slate-800);
  padding: 16px;
  border-radius: 8px;
  text-align: center;
}

.bm-card-ico { margin-bottom: 8px; }
.bm-card-ico svg { width: 24px; height: 24px; }
.bm-card-ico .blue { color: var(--blue); }
.bm-card-ico .cyan { color: var(--cyan); }
.bm-card-ico .coral { color: var(--coral); }
.bm-card-ico .teal { color: #2dd4bf; }

.bm-card-lbl { font-size: 13px; color: var(--slate-400); margin-bottom: 4px; }
.bm-card-val { font-size: 20px; font-weight: 700; color: var(--white); }

/* Ticker */
.ticker-wrap {
  background-color: var(--slate-100);
  padding: 16px 0;
  overflow: hidden;
  white-space: nowrap;
}

.ticker-row {
  display: flex;
  animation: marquee 30s linear infinite;
}

.ticker-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 500;
  color: var(--slate-600);
}

.ticker-sep {
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background-color: var(--slate-400);
  margin: 0 24px;
}

@keyframes marquee {
  from { transform: translateX(0); }
  to { transform: translateX(-50%); }
}

/* Pillar Section */
.pillar-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
  margin-bottom: 80px;
}
.pillar-row:last-child { margin-bottom: 0; }

.pillar-row.rev {
  grid-template-columns: 1fr 1fr;
}

.pillar-row.rev .pillar-info { grid-column: 2; grid-row: 1; }
.pillar-row.rev .pillar-visual { grid-column: 1; grid-row: 1; }

.pillar-badge {
  display: inline-block;
  padding: 4px 12px;
  border-radius: 99px;
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 16px;
}

.pillar-badge.pb-blue { background-color: #dbeafe; color: #2563eb; }
.pillar-badge.pb-cyan { background-color: #cffafe; color: #0891b2; }
.pillar-badge.pb-coral { background-color: #fff7ed; color: #c2410c; }

.pillar-title {
  font-size: 28px;
  font-weight: 700;
  color: var(--slate-900);
  margin: 0 0 16px;
}

.pillar-desc {
  margin-bottom: 24px;
  max-width: 450px;
}

.pillar-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.pillar-list-item {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 500;
}

.pli-dot {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.pli-dot svg { width: 12px; height: 12px; color: var(--white); }
.pli-dot.blue { background-color: var(--blue); }
.pli-dot.cyan { background-color: var(--cyan); }
.pli-dot.coral { background-color: var(--coral); }

.pillar-visual {
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 10px 20px rgba(15, 23, 42, 0.1);
}

.pv-panel {
  padding: 24px;
  background-color: var(--slate-50);
  border: 1px solid var(--slate-200);
  border-radius: 12px;
}

/* Tab Section */
.tab-section {
  display: grid;
  grid-template-columns: 250px 1fr;
  gap: 40px;
}

.tab-nav {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.tab-btn {
  width: 100%;
  padding: 12px 16px;
  font-size: 16px;
  font-weight: 600;
  color: var(--slate-600);
  background-color: transparent;
  border: 0;
  border-radius: 8px;
  display: flex;
  align-items: center;
  gap: 12px;
  cursor: pointer;
  transition: all 0.2s ease;
}

.tab-btn svg { width: 20px; height: 20px; flex-shrink: 0; }

.tab-btn:hover {
  background-color: var(--slate-100);
  color: var(--slate-900);
}

.tab-btn.active {
  background-color: #e0f2fe;
  color: var(--blue);
}

.tab-panel {
  display: none;
}

.tab-panel.active {
  display: block;
}

.tp-icon {
  width: 48px;
  height: 48px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
}
.tp-icon svg { width: 24px; height: 24px; color: var(--white); }
.tp-icon.blue { background-color: var(--blue); }
.tp-icon.cyan { background-color: var(--cyan); }
.tp-icon.coral { background-color: var(--coral); }
.tp-icon.teal { background-color: #14b8a6; }

.tp-title { font-size: 24px; font-weight: 700; margin: 0 0 12px; }
.tp-desc { margin: 0 0 24px; }

.tp-feats {
  list-style: none; padding: 0; margin: 0;
  display: grid; grid-template-columns: 1fr 1fr; gap: 16px;
}

.tp-feat {
  display: flex;
  align-items: flex-start;
  gap: 10px;
}

.tp-feat-dot {
  flex-shrink: 0;
  width: 8px; height: 8px;
  border-radius: 50%;
  margin-top: 8px;
  background-color: var(--blue);
}

/* Platform Grid */
.plat-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.plat-card {
  padding: 24px;
  border: 1px solid var(--slate-200);
  border-radius: 12px;
  text-align: center;
  transition: all 0.2s ease;
}

.plat-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 20px rgba(15, 23, 42, 0.08);
}

.plat-card.featured {
  border-color: var(--blue);
  background-color: #f0f9ff;
}

.sec-ocean2 .plat-card {
  background-color: rgba(255,255,255,0.05);
  border-color: rgba(255,255,255,0.12);
}

.sec-ocean2 .plat-card .plat-name {
  color: var(--white);
}

.sec-ocean2 .plat-card .plat-icon { color: var(--white); }
.sec-ocean2 .plat-card .plat-ver {
  color: var(--slate-300);
}
.sec-ocean2 .btn-outline-w { border-color: rgba(255,255,255,0.35); }
.sec-ocean2 .btn-outline-w:hover { background-color: rgba(255,255,255,0.1); border-color: rgba(255,255,255,0.5); }

.sec-ocean2 .plat-card.featured {
  background-color: rgba(2, 132, 199, 0.15);
  border-color: var(--blue);
}

.sec-ocean2 .plat-card.featured .plat-name {
  color: var(--white);
}

.sec-ocean2 .plat-card.featured .plat-ver {
  color: var(--slate-300);
}

.plat-icon { margin-bottom: 16px; }
.plat-icon svg { width: 48px; height: 48px; }
.plat-name { font-size: 20px; font-weight: 600; margin: 0 0 4px; }
.plat-ver { font-size: 14px; color: var(--slate-500); margin-bottom: 16px; }

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

.test-card {
  padding: 24px;
  background-color: var(--slate-50);
  border-radius: 12px;
}

.test-stars {
  display: flex;
  gap: 2px;
  color: #facc15;
  margin-bottom: 12px;
}
.test-stars svg { width: 16px; height: 16px; }

.test-quote { margin: 0 0 16px; font-style: italic; }

.test-footer {
  display: flex;
  align-items: center;
  gap: 12px;
}

.test-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  color: var(--white);
}
.av-blue { background-color: var(--blue); }
.av-cyan { background-color: var(--cyan); }
.av-coral { background-color: var(--coral); }
.av-green { background-color: #22c55e; }
.av-violet { background-color: #8b5cf6; }
.av-amber { background-color: #f59e0b; }

.test-name { font-weight: 600; }
.test-role { font-size: 14px; color: var(--slate-500); }

/* Benchmark */
.bench-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.bench-table {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.bench-row {
  display: grid;
  grid-template-columns: 100px 1fr 50px;
  gap: 16px;
  align-items: center;
}

.bench-name { font-weight: 600; }
.bench-track { height: 20px; background-color: var(--slate-200); border-radius: 4px; overflow: hidden; }
.bench-fill { height: 100%; border-radius: 4px; }
.bf-blue { background-color: var(--blue); }
.bf-gray { background-color: var(--slate-400); }
.bf-orange { background-color: #f97316; }
.bf-dark { background-color: var(--slate-600); }
.bench-score { font-weight: 700; font-size: 14px; text-align: right; }

.bench-info-title { font-size: 24px; font-weight: 700; margin: 0 0 12px; }
.bench-info-desc { margin: 0 0 24px; }

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

.bs-item { text-align: center; }
.bs-num { font-size: 32px; font-weight: 700; color: var(--blue); }
.bs-lbl { font-size: 14px; color: var(--slate-500); }

/* Comparison Table */
.cmp-wrap { overflow-x: auto; }
.cmp-table {
  width: 100%;
  border-collapse: collapse;
  min-width: 800px;
}

.cmp-table th, .cmp-table td {
  padding: 12px 16px;
  text-align: left;
  border-bottom: 1px solid var(--slate-200);
}

.cmp-table th { font-weight: 600; color: var(--slate-800); }
.cmp-table td { color: var(--slate-600); }
.cmp-table thead th { background-color: var(--slate-100); }
.cmp-table tbody tr:hover { background-color: var(--slate-50); }
.cmp-hl { font-weight: 600; color: var(--blue); }

.cmp-table .yes, .cmp-table .no, .cmp-table .part {
  display: flex; justify-content: center; align-items: center; width: 24px; height: 24px; margin: 0 auto;
}
.yes { color: #22c55e; }
.no { color: #ef4444; }
.part { color: #f59e0b; }

/* FAQ */
.faq-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  max-width: 1000px;
  margin: 0 auto;
}

.faq-item { border-bottom: 1px solid var(--slate-200); }
.faq-q {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 0;
  background: none; border: none;
  font-size: 18px; font-weight: 600; text-align: left;
  cursor: pointer;
}

.faq-chevron {
  transition: transform 0.3s ease;
}

.faq-a {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
}

.faq-a-inner { padding: 0 0 16px; }

.faq-item.open .faq-chevron { transform: rotate(180deg); }

/* CTA Banner */
.cta-banner {
  padding: 60px;
  background: linear-gradient(135deg, var(--blue) 0%, var(--cyan) 100%);
  border-radius: 20px;
  text-align: center;
  color: var(--white);
}

.cta-title { font-size: 32px; font-weight: 700; margin: 0 0 12px; }
.cta-sub { max-width: 500px; margin: 0 auto 24px; opacity: 0.9; }

/* Footer */
.site-footer {
  padding: 40px 0;
  background-color: var(--slate-900);
  color: var(--slate-400);
  font-size: 14px;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 600;
  color: var(--white);
}

.footer-security { margin-bottom: 8px; }
.footer-note { max-width: 500px; }

/* Download Page */
.dl-hero {
  padding: 60px 0;
  text-align: center;
  background-color: var(--slate-50);
}

.dl-hero-tag {
  display: inline-block;
  padding: 4px 12px;
  border-radius: 99px;
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 12px;
  background-color: #e0f2fe;
  color: var(--blue);
}

.dl-hero-title { font-size: 42px; font-weight: 700; margin: 0 0 12px; color: var(--slate-900); }
.dl-hero-sub { font-size: 18px; color: var(--slate-600); max-width: 600px; margin: 0 auto; }

.dl-win-card {
  max-width: 700px;
  margin: 60px auto 0;
  background: var(--white);
  border: 1px solid var(--slate-200);
  border-radius: 16px;
  box-shadow: 0 10px 25px rgba(0,0,0,0.05);
  text-align: left;
}

.dl-win-top {
  padding: 20px;
  display: flex;
  align-items: center;
  gap: 20px;
  border-bottom: 1px solid var(--slate-200);
}

.dl-win-icon svg { width: 64px; height: 64px; }
.dl-win-name { font-size: 24px; font-weight: 700; margin: 0; }
.dl-win-meta { color: var(--slate-500); }

.dl-specs {
  padding: 24px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  border-bottom: 1px solid var(--slate-200);
}

.dl-spec-label { font-size: 14px; color: var(--slate-500); }
.dl-spec-val { font-weight: 600; }

.dl-sec-badge {
  padding: 24px;
  display: flex;
  align-items: center;
  gap: 12px;
  background-color: #f0fdf4;
  color: #15803d;
  font-weight: 500;
  border-bottom: 1px solid var(--slate-200);
}
.dl-sec-badge svg { width: 20px; height: 20px; }

.dl-win-btns {
  padding: 24px;
  display: flex;
  gap: 16px;
}

.op-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.op-card {
  padding: 24px;
  border: 1px solid var(--slate-200);
  border-radius: 12px;
}

.op-icon { margin-bottom: 16px; }
.op-icon svg { width: 40px; height: 40px; }
.op-name { font-size: 20px; font-weight: 600; margin: 0 0 4px; }
.op-req { font-size: 14px; color: var(--slate-500); margin-bottom: 16px; }
.op-steps { font-size: 14px; color: var(--slate-600); }

.guide-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
}

.guide-col-title { font-size: 20px; font-weight: 700; margin-bottom: 24px; }
.guide-steps { display: flex; flex-direction: column; gap: 20px; }

.gstep {
  display: flex;
  gap: 16px;
}

.gstep-num {
  flex-shrink: 0;
  width: 32px; height: 32px;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-weight: 700;
  color: var(--white);
}

.gsn-blue { background-color: var(--blue); }
.gsn-cyan { background-color: var(--cyan); }

.gstep-title { font-weight: 600; margin-bottom: 4px; }
.gstep-desc { font-size: 14px; color: var(--slate-600); }

.req-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.req-card {
  padding: 20px;
  background-color: var(--slate-100);
  border-radius: 10px;
  text-align: center;
}

.req-icon { margin-bottom: 8px; color: var(--blue); }
.req-icon svg { width: 24px; height: 24px; }
.req-title { font-weight: 600; }
.req-val { font-size: 14px; color: var(--slate-500); }

.ver-list {
  max-width: 800px;
  margin: 0 auto;
  position: relative;
}

.ver-item {
  display: flex;
  gap: 24px;
  position: relative;
  padding-bottom: 40px;
}

.ver-dot-col {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.ver-dot {
  width: 16px; height: 16px;
  border-radius: 50%;
  border: 3px solid var(--white);
  outline: 2px solid;
  z-index: 1;
}

.vd-blue { outline-color: var(--blue); }
.vd-cyan { outline-color: var(--cyan); }
.vd-coral { outline-color: var(--coral); }
.vd-amber { outline-color: #f59e0b; }
.vd-green { outline-color: #22c55e; }

.ver-line {
  flex-grow: 1;
  width: 2px;
  background-color: var(--slate-200);
}
.ver-item:last-child .ver-line { display: none; }

.ver-body { flex-grow: 1; }
.ver-head { display: flex; align-items: center; gap: 12px; margin-bottom: 8px; }
.ver-num { font-size: 18px; font-weight: 700; }
.ver-tag {
  font-size: 12px; font-weight: 600; padding: 2px 8px; border-radius: 99px;
  color: var(--white);
}
.vt-stable { background-color: #22c55e; }
.vt-beta { background-color: #f59e0b; }
.vt-lts { background-color: var(--blue); }
.ver-date { font-size: 14px; color: var(--slate-500); }
.ver-desc { font-size: 15px; color: var(--slate-600); margin: 8px 0 0; line-height: 1.6; }

.sec-banner {
  padding: 24px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  gap: 20px;
  background-color: #eff6ff;
  color: #1e40af;
}

.sec-banner-ico { flex-shrink: 0; }
.sec-banner-ico svg { width: 32px; height: 32px; }
.sec-banner-title { font-weight: 700; margin-bottom: 4px; }
.sec-banner-desc { font-size: 14px; }

/* zh-cn page */
.art-hero {
  padding: 60px 0;
  background-color: var(--slate-100);
}

.art-hero-crumb {
  font-size: 14px;
  color: var(--slate-500);
  margin-bottom: 16px;
}

.art-hero-crumb a {
  color: var(--blue);
}

.art-hero-tag { font-weight: 600; color: var(--blue); margin-bottom: 8px; }
.art-hero-title { font-size: 36px; font-weight: 700; margin: 0 0 12px; }
.art-hero-h1 { font-size: 36px; font-weight: 700; margin: 0 0 16px; color: var(--slate-900); line-height: 1.3; }
.art-hero-sub { font-size: 18px; color: var(--slate-600); max-width: 800px; }

.kw-strip {
  padding: 16px 0;
  background-color: var(--slate-200);
  display: flex; flex-wrap: wrap; justify-content: center; gap: 12px;
}

.kw { background-color: var(--white); color: var(--slate-700); padding: 4px 12px; border-radius: 6px; font-size: 14px; }

.art-layout {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 40px;
  align-items: flex-start;
}

.art-body h2 { font-size: 24px; font-weight: 700; margin-top: 40px; margin-bottom: 16px; }
.art-body h3 { font-size: 20px; font-weight: 600; margin-top: 32px; margin-bottom: 12px; }
.art-body p, .art-body ul, .art-body ol { margin-bottom: 16px; }
.art-body ul, .art-body ol { padding-left: 20px; }
.art-body blockquote { border-left: 4px solid var(--slate-200); padding-left: 16px; margin-left: 0; font-style: italic; }

.inline-cta {
  padding: 24px;
  border-radius: 12px;
  background-color: #e0f2fe;
  margin: 32px 0;
  text-align: center;
}

.inline-cta-title { font-size: 20px; font-weight: 700; margin-bottom: 8px; }
.inline-cta-desc { margin-bottom: 16px; }

.inline-cta-blue {
  background-color: #e0f2fe;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.inline-cta-blue .inline-cta-desc { margin-bottom: 0; }

.inline-cta-cyan {
  background-color: #ecfeff;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.inline-cta-cyan .inline-cta-desc { margin-bottom: 0; }

/* Tips grid */
.art-tips-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin: 24px 0;
}

.art-tip {
  padding: 20px;
  background-color: var(--slate-50);
  border: 1px solid var(--slate-200);
  border-radius: 10px;
}

.art-tip-num {
  font-size: 12px;
  font-weight: 700;
  color: var(--blue);
  margin-bottom: 8px;
  letter-spacing: 1px;
}

.art-tip-title {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--slate-900);
}

.art-tip-desc {
  font-size: 14px;
  color: var(--slate-600);
  line-height: 1.5;
}

.faq-list { margin: 0; padding: 0; }

/* FAQ alternate class names for zh-cn */
.faq-question {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 0;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  color: var(--slate-800);
}

.faq-question .faq-chevron {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
  transition: transform 0.3s ease;
}

.faq-item.open .faq-question .faq-chevron {
  transform: rotate(180deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
}

.faq-answer-inner {
  padding: 0 0 16px;
  font-size: 15px;
  color: var(--slate-600);
  line-height: 1.6;
}

.sidebar {
  position: sticky;
  top: 100px;
}

.sbox {
  padding: 20px;
  border: 1px solid var(--slate-200);
  border-radius: 12px;
  margin-bottom: 24px;
}

.sbox-title { font-size: 18px; font-weight: 700; margin: 0 0 16px; padding-bottom: 12px; border-bottom: 1px solid var(--slate-200); }

.sdl-btn {
  display: flex;
  width: 100%;
  align-items: center;
  gap: 12px;
  padding: 12px;
  border-radius: 8px;
  margin-bottom: 12px;
  transition: background-color 0.2s;
}

.sdl-btn:hover { text-decoration: none; }
.sdl-btn.primary { background-color: var(--blue); color: var(--white); }
.sdl-btn.primary:hover { background-color: #0369a1; text-decoration: none; }
.sdl-btn.secondary { background-color: var(--slate-100); color: var(--slate-800); }
.sdl-btn.secondary:hover { background-color: var(--slate-200); text-decoration: none; }

.sdl-btn-ico { flex-shrink: 0; }
.sdl-btn-ico svg { width: 24px; height: 24px; }

.sdl-btn-info { flex-grow: 1; }
.sdl-btn-name { font-weight: 600; }
.sdl-btn-ver { font-size: 12px; opacity: 0.8; }

.stoc { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 8px; }
.stoc a { font-weight: 500; color: var(--slate-600); }
.stoc a:hover { color: var(--blue); }

.sstat { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.sstat-item { text-align: center; }
.sstat-num { font-weight: 700; font-size: 20px; color: var(--blue); }
.sstat-lbl { font-size: 12px; color: var(--slate-500); }

.side-security { font-size: 13px; color: var(--slate-500); text-align: center; }

/* Responsive */
@media (max-width: 992px) {
  .hero-inner { grid-template-columns: 1fr; text-align: center; }
  .hero-desc { margin: 0 auto 32px; }
  .hero-btns, .hero-trust { justify-content: center; }
  .hero-visual { margin-top: 40px; }
  .pillar-row, .pillar-row.rev { grid-template-columns: 1fr; }
  .pillar-row .pillar-visual { grid-row: 1; margin-bottom: 32px; }
  .pillar-row.rev .pillar-visual { grid-row: 1; }
  .tab-section { grid-template-columns: 1fr; }
  .tab-nav { flex-direction: row; overflow-x: auto; }
  .bench-grid { grid-template-columns: 1fr; }
  .art-layout { grid-template-columns: 1fr; }
  .sidebar { position: static; margin-top: 40px; }
}

@media (max-width: 768px) {
  .nav-menu { display: none; } /* Basic mobile nav hiding, can be improved with JS */
  .plat-grid { grid-template-columns: 1fr 1fr; }
  .test-grid { grid-template-columns: 1fr; }
  .faq-grid { grid-template-columns: 1fr; }
  .footer-inner { flex-direction: column; gap: 20px; text-align: center; }
  .dl-specs { grid-template-columns: 1fr 1fr; }
  .op-grid { grid-template-columns: 1fr; }
  .guide-grid { grid-template-columns: 1fr; }
  .req-grid { grid-template-columns: 1fr 1fr; }
  .art-tips-grid { grid-template-columns: 1fr; }
  .inline-cta-blue, .inline-cta-cyan { flex-direction: column; text-align: center; }
}

@media (max-width: 576px) {
  .hero-title { font-size: 40px; }
  .plat-grid { grid-template-columns: 1fr; }
  .dl-specs { grid-template-columns: 1fr; }
  .dl-win-btns { flex-direction: column; }
  .req-grid { grid-template-columns: 1fr; }
}