/* =========================================================
   DataMind AI — Overseas homepage (rebuild)
   Apple "Liquid Glass" aesthetic · frosted depth · teal + blue + violet
   ========================================================= */

/* ---------- Theme tokens ---------- */
:root {
  --max: 1200px;
  --radius: 20px;
  --radius-sm: 14px;
  --radius-lg: 28px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --blur: 26px;
  --blur-strong: 40px;
}

/* dark (default) */
[data-theme="dark"] {
  color-scheme: dark;
  --bg: #060912;
  --bg-2: #080c16;
  --text: #f1f4f9;
  --muted: rgba(210, 219, 232, 0.74);
  --faint: rgba(160, 172, 190, 0.58);

  --accent: #2dd4bf;
  --accent-2: #4f8cff;
  --accent-3: #8b7cf6;
  --accent-ink: #99f6e4;

  /* glass system */
  --glass-fill: rgba(255, 255, 255, 0.045);
  --glass-sheen: linear-gradient(157deg, rgba(255, 255, 255, 0.12), rgba(255, 255, 255, 0) 42%);
  --glass-bd: rgba(255, 255, 255, 0.12);
  --glass-bd-strong: rgba(255, 255, 255, 0.2);
  --glass-inset: inset 0 1px 0 rgba(255, 255, 255, 0.16), inset 0 0 0 1px rgba(255, 255, 255, 0.02);
  --glass-sh: 0 18px 50px -18px rgba(0, 0, 0, 0.65);
  --glass-strong: rgba(18, 25, 40, 0.62);

  --glow-a: rgba(45, 212, 191, 0.20);
  --glow-b: rgba(79, 140, 255, 0.20);
  --glow-c: rgba(139, 124, 246, 0.20);
  --grid-line: rgba(148, 163, 184, 0.05);
  --shadow: 0 30px 80px rgba(0, 0, 0, 0.55);
  --code-bg: rgba(8, 12, 22, 0.72);
}

/* light */
[data-theme="light"] {
  color-scheme: light;
  --bg: #eef1f8;
  --bg-2: #ffffff;
  --text: #0c1622;
  --muted: rgba(40, 56, 78, 0.72);
  --faint: rgba(40, 56, 78, 0.5);

  --accent: #0d9488;
  --accent-2: #2563eb;
  --accent-3: #7c5cf0;
  --accent-ink: #0f766e;

  /* glass system */
  --glass-fill: rgba(255, 255, 255, 0.55);
  --glass-sheen: linear-gradient(157deg, rgba(255, 255, 255, 0.85), rgba(255, 255, 255, 0.25) 46%);
  --glass-bd: rgba(255, 255, 255, 0.85);
  --glass-bd-strong: rgba(255, 255, 255, 1);
  --glass-inset: inset 0 1px 0 rgba(255, 255, 255, 0.9);
  --glass-sh: 0 18px 44px -16px rgba(23, 54, 99, 0.22);
  --glass-strong: rgba(255, 255, 255, 0.78);

  --glow-a: rgba(13, 148, 136, 0.16);
  --glow-b: rgba(37, 99, 235, 0.16);
  --glow-c: rgba(124, 92, 240, 0.14);
  --grid-line: rgba(15, 23, 42, 0.04);
  --shadow: 0 24px 60px rgba(15, 40, 70, 0.14);
  --code-bg: rgba(252, 253, 255, 0.66);
}

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

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  font-family: "Inter", "Noto Sans SC", -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", Roboto, "Helvetica Neue", Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
h1, h2, h3 { margin: 0; line-height: 1.12; letter-spacing: -0.02em; font-weight: 700; }
p { margin: 0; }
svg { width: 100%; height: 100%; }

/* ---------- Glass utility (shared visual language) ---------- */
.glass {
  background: var(--glass-sheen), var(--glass-fill);
  border: 1px solid var(--glass-bd);
  box-shadow: var(--glass-sh), var(--glass-inset);
  -webkit-backdrop-filter: blur(var(--blur)) saturate(170%);
  backdrop-filter: blur(var(--blur)) saturate(170%);
}

/* ---------- Backgrounds ---------- */
.bg-grid,
.bg-glow {
  position: fixed;
  inset: 0;
  z-index: -2;
  pointer-events: none;
}
.bg-grid {
  background-image:
    linear-gradient(var(--grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(120% 80% at 50% 0%, #000 0%, transparent 78%);
}
.bg-glow {
  z-index: -1;
  background:
    radial-gradient(58rem 32rem at 50% -10%, var(--glow-b), transparent 60%),
    radial-gradient(44rem 30rem at 6% 10%, var(--glow-a), transparent 64%),
    radial-gradient(48rem 30rem at 94% 4%, var(--glow-c), transparent 64%),
    radial-gradient(46rem 34rem at 82% 64%, var(--glow-a), transparent 70%),
    radial-gradient(40rem 30rem at 16% 80%, var(--glow-c), transparent 72%);
  opacity: 1;
}

/* ---------- Layout ---------- */
.shell {
  width: 100%;
  max-width: var(--max);
  margin: 0 auto;
  padding-inline: 24px;
}

.section { padding: 88px 0; }
.section-head { max-width: 720px; margin: 0 auto 46px; text-align: center; }
.section-head.left { text-align: left; margin-inline: 0; }

.kicker {
  display: inline-block;
  font-size: 12.5px;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 14px;
}
.section-head h2 { font-size: clamp(26px, 4vw, 41px); }
.section-head p { margin-top: 14px; color: var(--muted); font-size: 17px; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  height: 44px;
  padding: 0 20px;
  border-radius: 13px;
  font-size: 14.5px;
  font-weight: 600;
  border: 1px solid transparent;
  cursor: pointer;
  white-space: nowrap;
  transition: transform 0.18s var(--ease), background 0.2s, border-color 0.2s, box-shadow 0.2s;
}
.btn svg { width: 17px; height: 17px; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }
.btn:active { transform: translateY(1px); }
.btn-lg { height: 52px; padding: 0 28px; font-size: 15.5px; border-radius: 16px; }

.btn-primary {
  color: #04140f;
  background: linear-gradient(135deg, var(--accent) 0%, #38bdf8 55%, var(--accent-2) 100%);
  box-shadow: 0 12px 32px -10px var(--glow-a), inset 0 1px 0 rgba(255, 255, 255, 0.45);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 18px 42px -12px var(--glow-b), inset 0 1px 0 rgba(255, 255, 255, 0.5); }

.btn-ghost {
  color: var(--text);
  background: var(--glass-sheen), var(--glass-fill);
  border-color: var(--glass-bd);
  box-shadow: var(--glass-inset);
  -webkit-backdrop-filter: blur(var(--blur)) saturate(160%);
  backdrop-filter: blur(var(--blur)) saturate(160%);
}
.btn-ghost:hover { border-color: var(--accent); color: var(--accent-ink); }

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  backdrop-filter: blur(20px) saturate(180%);
  background: color-mix(in srgb, var(--bg) 58%, transparent);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s, background 0.3s, box-shadow 0.3s;
}
.site-header.scrolled {
  border-bottom-color: var(--glass-bd);
  background: color-mix(in srgb, var(--bg) 70%, transparent);
  box-shadow: 0 10px 30px -20px rgba(0, 0, 0, 0.6);
}
.nav {
  display: flex;
  align-items: center;
  gap: 18px;
  height: 68px;
}
.brand { display: inline-flex; align-items: center; gap: 10px; flex: 0 0 auto; }
.brand-logo { width: 30px; height: 30px; border-radius: 9px; }
.brand-name { font-size: 16.5px; font-weight: 700; letter-spacing: -0.01em; }
.brand-name em { font-style: normal; color: var(--accent); font-weight: 600; }

.nav-links {
  display: flex;
  align-items: center;
  flex: 1 1 auto;
  min-width: 0;
  max-width: 100%;
  gap: 2px;
  margin-inline: auto;
  padding: 5px;
  overflow-x: auto;
  overflow-y: hidden;
  scrollbar-width: none;
  border-radius: 999px;
  border: 1px solid var(--glass-bd);
  background: var(--glass-sheen), var(--glass-fill);
  box-shadow: var(--glass-inset);
  -webkit-backdrop-filter: blur(var(--blur)) saturate(160%);
  backdrop-filter: blur(var(--blur)) saturate(160%);
}
.nav-links::-webkit-scrollbar { display: none; }
.nav-links a {
  flex: 0 0 auto;
  padding: 8px 15px;
  border-radius: 999px;
  font-size: 14.5px;
  font-weight: 500;
  color: var(--muted);
  white-space: nowrap;
  word-break: keep-all;
  overflow-wrap: normal;
  transition: color 0.18s, background 0.18s;
}
.nav-links a:hover { color: var(--text); background: var(--glass-fill); }
.nav-links a.active { color: var(--accent-ink); background: var(--glow-a); }

.nav-actions { display: flex; align-items: center; flex: 0 0 auto; gap: 9px; min-width: max-content; }

.icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 5px;
  height: 40px;
  min-width: 40px;
  padding: 0 10px;
  border-radius: 12px;
  border: 1px solid var(--glass-bd);
  background: var(--glass-sheen), var(--glass-fill);
  box-shadow: var(--glass-inset);
  -webkit-backdrop-filter: blur(var(--blur)) saturate(160%);
  backdrop-filter: blur(var(--blur)) saturate(160%);
  color: var(--muted);
  cursor: pointer;
  transition: color 0.18s, border-color 0.18s, transform 0.18s;
}
.icon-btn svg {
  width: 18px; height: 18px;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}
.icon-btn:hover { color: var(--text); border-color: var(--glass-bd-strong); transform: translateY(-1px); }
.lang-code { font-size: 12px; font-weight: 700; letter-spacing: 0.03em; }

.theme-btn .ico-sun { display: none; }
[data-theme="light"] .theme-btn .ico-moon { display: none; }
[data-theme="light"] .theme-btn .ico-sun { display: block; }

.menu-btn { display: none; }

/* popover (language) */
.popover { position: relative; }
.popover-menu {
  position: absolute;
  top: calc(100% + 10px);
  right: 0;
  width: 230px;
  padding: 8px;
  border-radius: 18px;
  background: var(--glass-sheen), var(--glass-strong);
  border: 1px solid var(--glass-bd);
  box-shadow: var(--shadow), var(--glass-inset);
  -webkit-backdrop-filter: blur(var(--blur-strong)) saturate(180%);
  backdrop-filter: blur(var(--blur-strong)) saturate(180%);
  display: none;
  flex-direction: column;
  gap: 2px;
  z-index: 60;
}
.popover.open .popover-menu { display: flex; animation: pop 0.18s var(--ease); }
@keyframes pop { from { opacity: 0; transform: translateY(-6px) scale(0.98); } to { opacity: 1; transform: none; } }
.pop-item {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 10px 12px;
  border-radius: 12px;
  border: 0;
  background: transparent;
  color: var(--text);
  cursor: pointer;
  text-align: left;
  font: inherit;
  transition: background 0.15s;
}
.pop-item strong { font-size: 14px; font-weight: 600; }
.pop-item small { font-size: 11.5px; color: var(--faint); margin-left: auto; }
.pop-item:hover { background: var(--glass-fill); }
.pop-item.is-active { background: var(--glow-a); color: var(--accent-ink); }

/* mobile menu */
.mobile-menu {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 12px 24px 20px;
  border-top: 1px solid var(--glass-bd);
  background: var(--glass-sheen), var(--glass-strong);
  -webkit-backdrop-filter: blur(var(--blur-strong)) saturate(180%);
  backdrop-filter: blur(var(--blur-strong)) saturate(180%);
}
.mobile-menu a {
  padding: 11px 8px;
  font-size: 15px;
  font-weight: 500;
  color: var(--muted);
  border-bottom: 1px solid var(--glass-bd);
}
.mobile-menu a:hover { color: var(--text); }
.mobile-cta { display: flex; gap: 10px; margin-top: 14px; }
.mobile-cta .btn { flex: 1; }

/* ---------- Hero (centered hub) ---------- */
.hero { padding: 66px 0 42px; }
.hero-center {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}
.hero-pill {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 7px 9px 7px 13px;
  border-radius: 999px;
  border: 1px solid var(--glass-bd);
  background: var(--glass-sheen), var(--glass-fill);
  box-shadow: var(--glass-inset);
  -webkit-backdrop-filter: blur(var(--blur)) saturate(160%);
  backdrop-filter: blur(var(--blur)) saturate(160%);
  font-size: 13px;
  font-weight: 500;
  color: var(--muted);
  margin-bottom: 26px;
  transition: border-color 0.2s, color 0.2s, transform 0.2s;
}
.hero-pill:hover { border-color: var(--accent); color: var(--text); transform: translateY(-1px); }
.hero-pill .dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 4px var(--glow-a);
  animation: pulse 2.4s infinite;
}
.hero-pill svg { width: 15px; height: 15px; opacity: 0.6; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }
@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: 0.45; } }

.hero h1 {
  font-size: clamp(38px, 6vw, 66px);
  font-weight: 800;
  letter-spacing: -0.03em;
}
.hero h1 .grad {
  display: inline-block;
  background: linear-gradient(120deg, var(--accent) 0%, var(--accent-2) 58%, var(--accent-3) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero-lead {
  margin-top: 22px;
  max-width: 600px;
  font-size: 18px;
  color: var(--muted);
}
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 30px; }
.hero-actions.center { justify-content: center; }
.hero-proof {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px 22px;
  margin: 38px 0 0;
  padding: 0;
  list-style: none;
}
.hero-proof li {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-size: 13.5px;
  color: var(--muted);
}
.hero-proof svg { width: 17px; height: 17px; color: var(--accent); flex-shrink: 0; fill: none; stroke: currentColor; stroke-width: 1.9; stroke-linecap: round; stroke-linejoin: round; }

/* ---------- Hub (aggregation graph) ---------- */
.hub {
  position: relative;
  width: 100%;
  max-width: 740px;
  aspect-ratio: 740 / 430;
  margin: 34px auto 6px;
}
.hub-lines { position: absolute; inset: 0; width: 100%; height: 100%; overflow: visible; }
.hub-paths path { stroke: var(--accent); stroke-opacity: 0.3; }
.hub-dots circle { fill: var(--accent); filter: drop-shadow(0 0 5px var(--accent)); }

.hub-core {
  position: absolute;
  left: 50%; top: 50%;
  transform: translate(-50%, -50%);
  width: 138px; height: 138px;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  z-index: 3;
}
.hub-core-inner {
  position: relative;
  z-index: 2;
  width: 112px; height: 112px;
  border-radius: 50%;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: 2px;
  background:
    radial-gradient(circle at 50% 26%, rgba(45, 212, 191, 0.28), transparent 70%),
    var(--glass-sheen),
    var(--glass-strong);
  border: 1px solid rgba(45, 212, 191, 0.55);
  box-shadow:
    0 0 0 1px var(--glow-a),
    0 20px 46px -12px var(--glow-a),
    var(--glass-inset);
  -webkit-backdrop-filter: blur(var(--blur)) saturate(170%);
  backdrop-filter: blur(var(--blur)) saturate(170%);
}
.hub-core-inner img { width: 30px; height: 30px; border-radius: 9px; margin-bottom: 3px; }
.hub-core-name { font-size: 14px; font-weight: 800; letter-spacing: -0.01em; }
.hub-core-sub { font-size: 10.5px; color: var(--accent-ink); font-weight: 600; }
.hub-ring {
  position: absolute;
  left: 50%; top: 50%;
  border-radius: 50%;
  border: 1px solid var(--accent);
  transform: translate(-50%, -50%);
  opacity: 0;
}
.hub-ring.r1 { width: 138px; height: 138px; animation: hubPulse 3s ease-out infinite; }
.hub-ring.r2 { width: 138px; height: 138px; animation: hubPulse 3s ease-out infinite 1.5s; }
@keyframes hubPulse {
  0% { width: 124px; height: 124px; opacity: 0.5; }
  100% { width: 286px; height: 286px; opacity: 0; }
}

.node {
  position: absolute;
  transform: translate(-50%, -50%);
  display: flex; align-items: center; gap: 8px;
  padding: 8px 14px 8px 8px;
  border-radius: 999px;
  background: var(--glass-sheen), var(--glass-strong);
  border: 1px solid var(--glass-bd);
  box-shadow: var(--glass-sh), var(--glass-inset);
  -webkit-backdrop-filter: blur(var(--blur)) saturate(170%);
  backdrop-filter: blur(var(--blur)) saturate(170%);
  z-index: 2;
  animation: nodeFloat 5s ease-in-out infinite;
  transition: border-color 0.2s, transform 0.2s;
  white-space: nowrap;
}
.node:nth-child(odd) { animation-delay: -2.5s; }
.node img { width: 26px; height: 26px; border-radius: 8px; background: #fff; padding: 3px; box-sizing: border-box; }
.node b { font-size: 13px; font-weight: 600; }
@keyframes nodeFloat { 0%, 100% { transform: translate(-50%, -50%); } 50% { transform: translate(-50%, calc(-50% - 7px)); } }

/* ---------- Code showcase (quick start) ---------- */
.code-showcase { max-width: 780px; margin: 0 auto 40px; }
.code-tabs { display: flex; gap: 4px; margin-bottom: -1px; padding-left: 6px; }
.code-tab {
  padding: 9px 18px;
  border: 1px solid transparent;
  border-bottom: none;
  border-radius: 13px 13px 0 0;
  background: transparent;
  color: var(--muted);
  font: inherit;
  font-size: 13.5px;
  font-weight: 600;
  cursor: pointer;
  transition: color 0.18s, background 0.18s;
}
.code-tab:hover { color: var(--text); }
.code-tab.is-active {
  color: var(--accent-ink);
  background: var(--code-bg);
  border-color: var(--glass-bd);
}
.code-window {
  border-radius: 0 var(--radius) var(--radius) var(--radius);
  background: var(--code-bg);
  border: 1px solid var(--glass-bd);
  box-shadow: var(--glass-sh), var(--glass-inset);
  -webkit-backdrop-filter: blur(var(--blur-strong)) saturate(160%);
  backdrop-filter: blur(var(--blur-strong)) saturate(160%);
  overflow: hidden;
}
.term-bar {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 12px 15px;
  border-bottom: 1px solid rgba(148, 163, 184, 0.14);
  background: rgba(255, 255, 255, 0.03);
}
.tdot { width: 11px; height: 11px; border-radius: 50%; }
.tdot.r { background: #ff5f57; }
.tdot.y { background: #febc2e; }
.tdot.g { background: #28c840; }
.term-bar b { margin-left: 8px; font-size: 12.5px; font-weight: 500; color: rgba(203, 213, 225, 0.7); }
.copy-btn {
  margin-left: auto;
  width: 30px; height: 30px;
  display: inline-flex; align-items: center; justify-content: center;
  border-radius: 9px;
  border: 1px solid rgba(148, 163, 184, 0.18);
  background: transparent;
  color: rgba(203, 213, 225, 0.7);
  cursor: pointer;
  transition: color 0.18s, border-color 0.18s;
}
.copy-btn svg { width: 15px; height: 15px; }
.copy-btn:hover { color: var(--accent); border-color: var(--accent); }
.copy-btn.copied { color: #28c840; border-color: #28c840; }
.term-body {
  margin: 0;
  padding: 20px 22px;
  overflow-x: auto;
  font-family: "JetBrains Mono", ui-monospace, "SFMono-Regular", Menlo, monospace;
  font-size: 13.5px;
  line-height: 1.85;
  color: #cdd6e4;
}
.term-body code { white-space: pre; }
.c-kw { color: #c792ea; }
.c-str { color: #c3e88d; }
.c-num { color: #f78c6c; }
.c-fn { color: #82aaff; }

/* trust strip */
.trust-strip {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
  margin-top: 60px;
  padding: 30px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--glass-bd);
  background: var(--glass-sheen), var(--glass-fill);
  box-shadow: var(--glass-sh), var(--glass-inset);
  -webkit-backdrop-filter: blur(var(--blur)) saturate(170%);
  backdrop-filter: blur(var(--blur)) saturate(170%);
}
.trust-stat { text-align: center; }
.trust-stat strong {
  display: block;
  font-size: 31px;
  font-weight: 800;
  letter-spacing: -0.02em;
  background: linear-gradient(120deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.trust-stat span { font-size: 13px; color: var(--muted); }

/* ---------- Models ---------- */
.model-tabs {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 34px;
}
.model-tab {
  height: 40px;
  padding: 0 18px;
  border-radius: 12px;
  border: 1px solid var(--glass-bd);
  background: var(--glass-sheen), var(--glass-fill);
  box-shadow: var(--glass-inset);
  -webkit-backdrop-filter: blur(var(--blur)) saturate(160%);
  backdrop-filter: blur(var(--blur)) saturate(160%);
  color: var(--muted);
  font: inherit;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: color 0.18s, border-color 0.18s, transform 0.18s;
}
.model-tab:hover { color: var(--text); border-color: var(--glass-bd-strong); transform: translateY(-1px); }
.model-tab.is-active {
  color: #04140f;
  background: linear-gradient(135deg, var(--accent), #38bdf8);
  border-color: transparent;
  box-shadow: 0 10px 26px -10px var(--glow-a);
}

.model-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}
.model-card {
  position: relative;
  padding: 24px;
  border-radius: var(--radius);
  border: 1px solid var(--glass-bd);
  background: var(--glass-sheen), var(--glass-fill);
  box-shadow: var(--glass-inset);
  -webkit-backdrop-filter: blur(var(--blur)) saturate(170%);
  backdrop-filter: blur(var(--blur)) saturate(170%);
  transition: transform 0.22s var(--ease), border-color 0.22s, box-shadow 0.22s;
  overflow: hidden;
}
.model-card::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
  opacity: 0;
  transition: opacity 0.25s;
}
.model-card:hover {
  transform: translateY(-4px);
  border-color: var(--glass-bd-strong);
  box-shadow: var(--glass-sh), var(--glass-inset);
}
.model-card:hover::before { opacity: 1; }
.model-top { display: flex; align-items: center; gap: 12px; margin-bottom: 16px; }
.model-logo {
  width: 44px; height: 44px;
  border-radius: 13px;
  display: flex; align-items: center; justify-content: center;
  background: #ffffff;
  border: 1px solid var(--glass-bd);
  box-shadow: 0 4px 12px -6px rgba(0, 0, 0, 0.4);
  flex-shrink: 0;
}
.model-logo img { width: 26px; height: 26px; }
.model-head h3 { font-size: 16px; font-weight: 700; }
.model-head .model-provider { font-size: 12.5px; color: var(--faint); }
.model-badge {
  margin-left: auto;
  font-size: 10.5px;
  font-weight: 700;
  letter-spacing: 0.04em;
  padding: 4px 9px;
  border-radius: 999px;
  color: var(--accent-ink);
  background: var(--glow-a);
  border: 1px solid var(--glass-bd);
}
.model-desc { font-size: 13.5px; color: var(--muted); min-height: 40px; margin-bottom: 16px; }
.model-price {
  display: flex;
  gap: 18px;
  padding-top: 14px;
  border-top: 1px solid var(--glass-bd);
}
.mp-item { display: flex; flex-direction: column; }
.mp-item span { font-size: 11px; color: var(--faint); text-transform: uppercase; letter-spacing: 0.05em; }
.mp-item strong { font-size: 15px; font-weight: 700; font-family: "JetBrains Mono", monospace; }
.mp-item strong em { font-style: normal; font-size: 11px; color: var(--faint); font-weight: 500; }
.model-foot { text-align: center; margin-top: 36px; }
.model-foot .btn svg { width: 16px; height: 16px; }

/* ---------- Steps ---------- */
.step-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.step-card {
  position: relative;
  padding: 30px 26px;
  border-radius: var(--radius);
  border: 1px solid var(--glass-bd);
  background: var(--glass-sheen), var(--glass-fill);
  box-shadow: var(--glass-inset);
  -webkit-backdrop-filter: blur(var(--blur)) saturate(170%);
  backdrop-filter: blur(var(--blur)) saturate(170%);
  transition: border-color 0.2s, transform 0.2s, box-shadow 0.2s;
}
.step-card:hover { border-color: var(--glass-bd-strong); transform: translateY(-3px); box-shadow: var(--glass-sh), var(--glass-inset); }
.step-num {
  font-family: "JetBrains Mono", monospace;
  font-size: 14px;
  font-weight: 700;
  color: var(--accent);
  opacity: 0.85;
}
.step-card h3 { font-size: 18px; margin: 14px 0 8px; }
.step-card p { font-size: 14.5px; color: var(--muted); margin-bottom: 16px; }
.step-card p code,
.faq-list code {
  font-family: "JetBrains Mono", monospace;
  font-size: 0.88em;
  padding: 2px 6px;
  border-radius: 7px;
  background: var(--glow-a);
  color: var(--accent-ink);
}
.step-card a { font-size: 14px; font-weight: 600; color: var(--accent-ink); }
.step-card a:hover { color: var(--accent); }

/* ---------- Tools ---------- */
.tool-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.tool-card {
  padding: 26px 24px;
  border-radius: var(--radius);
  border: 1px solid var(--glass-bd);
  background: var(--glass-sheen), var(--glass-fill);
  box-shadow: var(--glass-inset);
  -webkit-backdrop-filter: blur(var(--blur)) saturate(170%);
  backdrop-filter: blur(var(--blur)) saturate(170%);
  transition: border-color 0.2s, transform 0.2s, box-shadow 0.2s;
}
.tool-card:hover { border-color: var(--accent); transform: translateY(-3px); box-shadow: var(--glass-sh), var(--glass-inset); }
.tool-tag {
  display: inline-block;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--accent-ink);
  background: var(--glow-a);
  padding: 4px 9px;
  border-radius: 8px;
  margin-bottom: 14px;
}
.tool-card h3 { font-size: 17px; margin-bottom: 8px; }
.tool-card p { font-size: 13.5px; color: var(--muted); }

/* ---------- Split panel (pricing) ---------- */
.split-panel {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: center;
  padding: 50px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--glass-bd);
  background: var(--glass-sheen), var(--glass-fill);
  box-shadow: var(--glass-sh), var(--glass-inset);
  -webkit-backdrop-filter: blur(var(--blur-strong)) saturate(170%);
  backdrop-filter: blur(var(--blur-strong)) saturate(170%);
}
.split-copy h2 { font-size: clamp(24px, 3.4vw, 34px); margin: 12px 0 0; }
.split-copy p { margin: 16px 0 0; color: var(--muted); font-size: 16px; }
.split-cards { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.mini-card {
  display: block;
  padding: 20px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--glass-bd);
  background: var(--glass-sheen), var(--glass-fill);
  box-shadow: var(--glass-inset);
  -webkit-backdrop-filter: blur(var(--blur)) saturate(160%);
  backdrop-filter: blur(var(--blur)) saturate(160%);
  transition: border-color 0.2s, transform 0.2s;
}
.mini-card:hover { border-color: var(--accent); transform: translateY(-2px); }
.mini-card strong { display: block; font-size: 15px; margin-bottom: 6px; }
.mini-card small { font-size: 13px; color: var(--muted); line-height: 1.5; }

/* ---------- Trust grid ---------- */
.trust-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.trust-card {
  padding: 28px 24px;
  border-radius: var(--radius);
  border: 1px solid var(--glass-bd);
  background: var(--glass-sheen), var(--glass-fill);
  box-shadow: var(--glass-inset);
  -webkit-backdrop-filter: blur(var(--blur)) saturate(170%);
  backdrop-filter: blur(var(--blur)) saturate(170%);
  transition: border-color 0.2s, transform 0.2s, box-shadow 0.2s;
}
.trust-card:hover { border-color: var(--glass-bd-strong); transform: translateY(-3px); box-shadow: var(--glass-sh), var(--glass-inset); }
.trust-card svg {
  width: 26px; height: 26px;
  color: var(--accent);
  margin-bottom: 14px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}
.trust-card strong { display: block; font-size: 15.5px; margin-bottom: 8px; }
.trust-card small { font-size: 13px; color: var(--muted); line-height: 1.55; }

/* ---------- FAQ ---------- */
.faq-list { max-width: 800px; margin: 0 auto; display: flex; flex-direction: column; gap: 12px; }
.faq-list details {
  border: 1px solid var(--glass-bd);
  border-radius: var(--radius-sm);
  background: var(--glass-sheen), var(--glass-fill);
  box-shadow: var(--glass-inset);
  -webkit-backdrop-filter: blur(var(--blur)) saturate(160%);
  backdrop-filter: blur(var(--blur)) saturate(160%);
  overflow: hidden;
  transition: border-color 0.2s;
}
.faq-list details[open] { border-color: var(--glass-bd-strong); }
.faq-list summary {
  list-style: none;
  cursor: pointer;
  padding: 18px 22px;
  font-size: 16px;
  font-weight: 600;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary::after {
  content: "+";
  font-size: 22px;
  font-weight: 400;
  color: var(--accent);
  transition: transform 0.2s;
}
.faq-list details[open] summary::after { transform: rotate(45deg); }
.faq-list p { padding: 0 22px 20px; color: var(--muted); font-size: 14.5px; }

/* ---------- Final CTA ---------- */
.final-cta { padding-bottom: 100px; }
.final-panel {
  text-align: center;
  max-width: 760px;
  margin: 0 auto;
  padding: 60px 42px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--glass-bd);
  background:
    radial-gradient(40rem 16rem at 50% -20%, var(--glow-a), transparent 70%),
    var(--glass-sheen),
    var(--glass-fill);
  box-shadow: var(--glass-sh), var(--glass-inset);
  -webkit-backdrop-filter: blur(var(--blur-strong)) saturate(170%);
  backdrop-filter: blur(var(--blur-strong)) saturate(170%);
}
.final-panel h2 { font-size: clamp(26px, 4vw, 40px); margin: 12px 0; }
.final-panel p { color: var(--muted); font-size: 17px; max-width: 520px; margin: 0 auto 8px; }

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--glass-bd);
  background: color-mix(in srgb, var(--bg-2) 70%, transparent);
  -webkit-backdrop-filter: blur(var(--blur)) saturate(150%);
  backdrop-filter: blur(var(--blur)) saturate(150%);
  padding: 58px 0 28px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 1fr;
  gap: 32px;
}
.footer-brand p { margin: 14px 0 18px; font-size: 13.5px; color: var(--muted); max-width: 280px; }
.footer-social { display: flex; gap: 10px; }
.footer-social a {
  width: 38px; height: 38px;
  display: inline-flex; align-items: center; justify-content: center;
  border-radius: 11px;
  border: 1px solid var(--glass-bd);
  background: var(--glass-fill);
  color: var(--muted);
  transition: color 0.2s, border-color 0.2s, transform 0.2s;
}
.footer-social a svg { width: 17px; height: 17px; }
.footer-social a:hover { color: var(--accent); border-color: var(--accent); transform: translateY(-2px); }
.footer-col { display: flex; flex-direction: column; gap: 11px; }
.footer-label {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--faint);
  margin-bottom: 3px;
}
.footer-col a { font-size: 14px; color: var(--muted); transition: color 0.18s; }
.footer-col a:hover { color: var(--accent); }
.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 40px;
  padding-top: 22px;
  border-top: 1px solid var(--glass-bd);
  font-size: 13px;
  color: var(--faint);
}
.footer-bottom a { color: var(--accent-ink); }

/* ---------- Contact FAB ---------- */
.contact-fab {
  position: fixed;
  right: 24px;
  bottom: 24px;
  z-index: 70;
  width: 56px;
  height: 56px;
  border-radius: 18px;
  border: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #04140f;
  background: linear-gradient(135deg, var(--accent), #38bdf8);
  box-shadow: 0 16px 36px -8px var(--glow-a), inset 0 1px 0 rgba(255, 255, 255, 0.4);
  cursor: pointer;
  transition: transform 0.2s var(--ease);
}
.contact-fab svg { width: 24px; height: 24px; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }
.contact-fab:hover { transform: translateY(-3px) scale(1.05); }

.contact-modal { position: fixed; inset: 0; z-index: 80; display: flex; align-items: center; justify-content: center; padding: 20px; }
.contact-backdrop { position: absolute; inset: 0; background: rgba(2, 5, 12, 0.55); -webkit-backdrop-filter: blur(6px); backdrop-filter: blur(6px); }
.contact-panel {
  position: relative;
  width: 100%;
  max-width: 420px;
  padding: 32px;
  border-radius: var(--radius-lg);
  background: var(--glass-sheen), var(--glass-strong);
  border: 1px solid var(--glass-bd);
  box-shadow: var(--shadow), var(--glass-inset);
  -webkit-backdrop-filter: blur(var(--blur-strong)) saturate(180%);
  backdrop-filter: blur(var(--blur-strong)) saturate(180%);
  animation: pop 0.22s var(--ease);
}
.contact-close {
  position: absolute;
  top: 16px; right: 16px;
  width: 30px; height: 30px;
  border: 0; border-radius: 9px;
  background: var(--glass-fill);
  color: var(--muted);
  font-size: 20px;
  line-height: 1;
  cursor: pointer;
}
.contact-close:hover { color: var(--text); }
.contact-panel h3 { font-size: 20px; margin-bottom: 8px; }
.contact-panel > p { font-size: 13.5px; color: var(--muted); margin-bottom: 20px; }
.contact-list { display: flex; flex-direction: column; gap: 10px; }
.contact-item {
  display: flex;
  align-items: center;
  gap: 13px;
  padding: 13px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--glass-bd);
  background: var(--glass-fill);
  transition: border-color 0.2s, transform 0.2s;
}
.contact-item:hover { border-color: var(--accent); transform: translateX(2px); }
.ci-ico {
  width: 40px; height: 40px;
  border-radius: 12px;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
}
.ci-ico svg { width: 20px; height: 20px; }
.ci-ico.email { background: rgba(45, 212, 191, 0.16); color: var(--accent); }
.ci-ico.tg { background: rgba(56, 189, 248, 0.16); color: #38bdf8; }
.ci-ico.dc { background: rgba(124, 109, 242, 0.18); color: #8b7cf6; }
.ci-tx { display: flex; flex-direction: column; }
.ci-tx strong { font-size: 14.5px; }
.ci-tx span { font-size: 12.5px; color: var(--faint); }

/* ---------- Theme menu (light / dark / system) ---------- */
.theme-menu { width: 186px; }
.theme-option { align-items: center; }
.theme-option .to-ico {
  width: 18px; height: 18px;
  display: inline-flex; align-items: center; justify-content: center;
  color: var(--muted);
  flex: 0 0 auto;
}
.theme-option .to-ico svg {
  width: 18px; height: 18px;
  fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round;
}
.theme-option strong { font-size: 14px; font-weight: 600; }
.theme-option .to-check { margin-left: auto; width: 16px; height: 16px; flex: 0 0 auto; }
.theme-option.is-active { color: var(--accent-ink); background: var(--glow-a); }
.theme-option.is-active .to-ico { color: var(--accent); }
.theme-option.is-active .to-check {
  background: var(--accent);
  -webkit-mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath fill='none' stroke='black' stroke-width='3' stroke-linecap='round' stroke-linejoin='round' d='M5 13l4 4L19 7'/%3E%3C/svg%3E") center/contain no-repeat;
  mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath fill='none' stroke='black' stroke-width='3' stroke-linecap='round' stroke-linejoin='round' d='M5 13l4 4L19 7'/%3E%3C/svg%3E") center/contain no-repeat;
}

/* ---------- Language modal ---------- */
.lang-modal { position: fixed; inset: 0; z-index: 90; display: flex; align-items: center; justify-content: center; padding: 20px; }
.lang-modal-backdrop { position: absolute; inset: 0; background: rgba(2, 5, 12, 0.55); -webkit-backdrop-filter: blur(6px); backdrop-filter: blur(6px); }
.lang-modal-panel {
  position: relative;
  width: 100%;
  max-width: 520px;
  padding: 28px;
  border-radius: var(--radius-lg);
  background: var(--glass-sheen), var(--glass-strong);
  border: 1px solid var(--glass-bd);
  box-shadow: var(--shadow), var(--glass-inset);
  -webkit-backdrop-filter: blur(var(--blur-strong)) saturate(180%);
  backdrop-filter: blur(var(--blur-strong)) saturate(180%);
  animation: pop 0.22s var(--ease);
}
.lang-modal-close {
  position: absolute;
  top: 16px; right: 16px;
  width: 30px; height: 30px;
  border: 0; border-radius: 9px;
  background: var(--glass-fill);
  color: var(--muted);
  font-size: 20px; line-height: 1;
  cursor: pointer;
}
.lang-modal-close:hover { color: var(--text); }
.lang-modal-head { display: flex; align-items: center; gap: 14px; margin-bottom: 20px; }
.lang-modal-ico {
  width: 46px; height: 46px;
  border-radius: 14px;
  display: grid; place-items: center;
  background: var(--glow-a);
  color: var(--accent);
  flex: 0 0 auto;
}
.lang-modal-ico svg { width: 24px; height: 24px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
.lang-modal-tx h3 { font-size: 18px; }
.lang-modal-tx p { font-size: 13px; color: var(--muted); margin-top: 3px; }
.lang-modal-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.lang-option {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 13px 14px;
  border-radius: 14px;
  border: 1px solid var(--glass-bd);
  background: var(--glass-fill);
  color: var(--text);
  cursor: pointer;
  text-align: left;
  font: inherit;
  transition: border-color 0.18s, transform 0.18s, background 0.18s;
}
.lang-option:hover { border-color: var(--accent); transform: translateY(-1px); }
.lang-option.is-active { border-color: var(--accent); background: var(--glow-a); }
.lo-tx { display: flex; flex-direction: column; min-width: 0; }
.lo-tx strong { font-size: 14px; font-weight: 600; }
.lo-tx small { font-size: 11.5px; color: var(--faint); }
.lo-code { margin-left: auto; font-size: 11px; font-weight: 700; color: var(--accent-ink); background: var(--glow-a); padding: 3px 7px; border-radius: 7px; flex: 0 0 auto; }

/* ---------- Hub "more models" node ---------- */
.node-more { cursor: pointer; }
.node-more-ico {
  width: 26px; height: 26px;
  border-radius: 8px;
  display: grid; place-items: center;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #04140f;
  flex: 0 0 auto;
}
.node-more-ico svg { width: 15px; height: 15px; fill: currentColor; stroke: none; }
.node-more b { color: var(--accent-ink); }
.node-more:hover { border-color: var(--accent); }

/* ---------- Light theme: code block ---------- */
[data-theme="light"] .term-body { color: #1f2a37; }
[data-theme="light"] .term-bar { background: rgba(15, 23, 42, 0.04); border-bottom-color: rgba(15, 23, 42, 0.08); }
[data-theme="light"] .term-bar b { color: rgba(40, 56, 78, 0.7); }
[data-theme="light"] .copy-btn { color: rgba(40, 56, 78, 0.62); border-color: rgba(15, 23, 42, 0.12); }
[data-theme="light"] .copy-btn:hover { color: var(--accent); border-color: var(--accent); }
[data-theme="light"] .c-kw { color: #9333ea; }
[data-theme="light"] .c-str { color: #15803d; }
[data-theme="light"] .c-num { color: #c2410c; }
[data-theme="light"] .c-fn { color: #2563eb; }

[hidden] { display: none !important; }

/* ---------- Reveal animation ---------- */
.reveal { opacity: 0; transform: translateY(20px); transition: opacity 0.6s var(--ease), transform 0.6s var(--ease); }
.reveal.in { opacity: 1; transform: none; }

/* ---------- Responsive ---------- */
@media (max-width: 1040px) {
  .nav-links { display: none; }
  .btn-login { display: none; }
  .menu-btn { display: inline-flex; }
  /* keep hub nodes inside the frame on narrower screens */
  .hub { max-width: 660px; }
  .node img { width: 23px; height: 23px; }
  .node b { font-size: 12px; }
  .node { padding: 7px 12px 7px 7px; }
}

@media (max-width: 980px) {
  .model-grid { grid-template-columns: repeat(2, 1fr); }
  .tool-grid { grid-template-columns: repeat(2, 1fr); }
  .trust-grid { grid-template-columns: repeat(2, 1fr); }
  .split-panel { grid-template-columns: 1fr; gap: 28px; padding: 38px; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 28px; }
  .footer-brand { grid-column: 1 / -1; }
}

@media (max-width: 1180px) and (min-width: 1041px) {
  .nav { gap: 12px; }
  .nav-links a { padding-inline: 11px; font-size: 13.5px; }
  .nav-actions { gap: 7px; }
}

@media (max-width: 1440px) and (min-width: 1041px) {
  .nav .btn-primary { display: none; }
  .brand-name { font-size: 15.5px; }
  .nav-links a { padding-inline: 12px; }
}

@media (max-width: 720px) {
  .nav-links { display: none; }
  .btn-login { display: none; }
  .menu-btn { display: inline-flex; }
  .section { padding: 64px 0; }
  .hero { padding: 40px 0 24px; }
  .hub { max-width: 440px; }
  .node { padding: 5px 10px 5px 5px; }
  .node img { width: 20px; height: 20px; }
  .node b { font-size: 10.5px; }
  .hub-core { width: 98px; height: 98px; }
  .hub-core-inner { width: 86px; height: 86px; }
  .hub-core-inner img { width: 22px; height: 22px; }
  .hub-core-name { font-size: 12px; }
  .code-tab { padding: 8px 13px; font-size: 12.5px; }
  .step-grid { grid-template-columns: 1fr; }
  .trust-strip { grid-template-columns: repeat(2, 1fr); gap: 20px 14px; }
  .model-grid { grid-template-columns: 1fr; }
  .tool-grid { grid-template-columns: 1fr; }
  .split-cards { grid-template-columns: 1fr; }
  .lang-modal-grid { grid-template-columns: 1fr; }
}

@media (min-width: 721px) {
  .mobile-menu { display: none !important; }
}

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; }
}