/* ===== Theme tokens ===== */
:root {
  --bg: #060a16;
  --bg-2: #0a1020;
  --card: #0e1626;
  --card-2: #111b30;
  --border: #1b2740;
  --border-soft: #16203a;
  --text: #e6ebf5;
  --muted: #8a97b0;
  --accent: #3b82f6;
  --accent-2: #38bdf8;
  --ok: #22c55e;
  --warn: #f59e0b;
  --no: #ef4444;
  --radius: 16px;
  --maxw: none;
  --code-fg: #c8d6f0;
  --shadow: 0 24px 60px -20px rgba(0, 0, 0, .65);
}
[data-theme="light"] {
  --bg: #f4f7fc;
  --bg-2: #eaf0fa;
  --card: #ffffff;
  --card-2: #f7f9fe;
  --border: #dde6f3;
  --border-soft: #e7eef8;
  --text: #0e1626;
  --muted: #5a6680;
  --shadow: 0 24px 50px -24px rgba(30, 60, 120, .25);
  --code-fg: #243049;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: "PingFang SC", "Microsoft YaHei", -apple-system, BlinkMacSystemFont,
    "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  /* NOTE: do not set overflow-x here — it turns body into a scroll container and
     breaks position:sticky on the top bar. Horizontal overflow is clipped at its
     source (.hero-art) instead. */
}
a { color: inherit; text-decoration: none; }
.container { width: 98%; max-width: var(--maxw); margin: 0 auto; padding: 0 clamp(16px, 2.5vw, 56px); }
/* clip page-content overflow here (NOT on body) so the sticky top bar — which sits
   outside <main> — keeps working while horizontal overflow can't create a scrollbar */
main { overflow-x: clip; }

/* ===== Background decoration ===== */
.bg-grid {
  position: fixed; inset: 0; z-index: -2;
  background:
    linear-gradient(180deg, var(--bg) 0%, var(--bg-2) 100%),
    radial-gradient(circle at 50% -10%, rgba(59, 130, 246, .18), transparent 55%);
}
.bg-grid::after {
  content: ""; position: absolute; inset: 0;
  background-image:
    linear-gradient(to right, rgba(120, 150, 200, .06) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(120, 150, 200, .06) 1px, transparent 1px);
  background-size: 46px 46px;
  mask-image: radial-gradient(circle at 50% 0%, #000 30%, transparent 75%);
}
.bg-glow {
  position: fixed; top: -180px; right: -120px; z-index: -1;
  width: 620px; height: 620px; border-radius: 50%;
  background: radial-gradient(circle, rgba(56, 189, 248, .22), transparent 65%);
  filter: blur(20px); pointer-events: none;
}

/* ===== Release banner ===== */
.release-bar[hidden] { display: none; }
.release-bar {
  position: relative; z-index: 60;
  display: flex; align-items: center; justify-content: center; gap: 14px;
  padding: 9px 44px 9px 16px; text-align: center;
  background: linear-gradient(90deg, color-mix(in srgb, var(--accent) 30%, var(--bg)), color-mix(in srgb, var(--accent-2) 26%, var(--bg)));
  border-bottom: 1px solid color-mix(in srgb, var(--accent) 40%, var(--border));
}
.release-text { font-size: 13.5px; font-weight: 600; color: var(--text); }
.release-text:hover { color: var(--accent-2); }
.release-close {
  position: absolute; right: 12px; top: 50%; transform: translateY(-50%);
  background: transparent; border: none; cursor: pointer;
  color: var(--muted); font-size: 14px; line-height: 1; padding: 4px;
}
.release-close:hover { color: var(--text); }

/* ===== Nav ===== */
.sticky-top { position: sticky; top: 0; z-index: 60; }
.nav {
  backdrop-filter: blur(14px);
  background: color-mix(in srgb, var(--bg) 72%, transparent);
  border-bottom: 1px solid var(--border-soft);
}
.nav-inner { display: flex; align-items: center; gap: 28px; height: 64px; }
.logo { font-weight: 700; font-size: 19px; letter-spacing: .2px; display: inline-flex; align-items: center; gap: 7px; }
.logo-mark { color: var(--accent-2); font-weight: 700; }
.nav-links { display: flex; gap: 26px; margin: 0 auto 0 12px; }
.nav-links a { color: var(--muted); font-size: 14.5px; transition: color .2s; }
.nav-links a:hover { color: var(--text); }
.nav-actions { display: flex; align-items: center; gap: 12px; margin-left: auto; }
.ghost-link { display: inline-flex; align-items: center; gap: 6px; color: var(--muted); font-size: 14px; transition: color .2s; }
.ghost-link:hover { color: var(--text); }
.star-btn {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 13.5px; font-weight: 600;
  padding: 7px 13px; border-radius: 9px;
  background: var(--card); border: 1px solid var(--border);
  transition: border-color .2s, transform .2s;
}
.star-btn:hover { border-color: var(--accent); transform: translateY(-1px); }
.star-icon { color: #fbbf24; }
.star-count { color: var(--muted); }
.theme-toggle, .lang-toggle {
  height: 34px; border-radius: 9px; cursor: pointer;
  background: var(--card); border: 1px solid var(--border); color: var(--text);
  font-size: 14px; transition: border-color .2s, color .2s;
}
.theme-toggle { width: 34px; font-size: 15px; }
.lang-toggle { padding: 0 12px; font-weight: 700; font-size: 13px; }
.theme-toggle:hover, .lang-toggle:hover { border-color: var(--accent); color: var(--accent-2); }

/* ===== Pills / buttons ===== */
.pill {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 13px; color: var(--muted);
  padding: 6px 13px; border-radius: 999px;
  background: var(--card); border: 1px solid var(--border);
}
.pill-accent { color: var(--accent-2); border-color: color-mix(in srgb, var(--accent) 50%, var(--border)); }
.pill-row { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 26px; }
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  font-size: 15px; font-weight: 600; padding: 12px 24px; border-radius: 11px;
  transition: transform .2s, box-shadow .2s, background .2s, border-color .2s;
}
.btn-primary {
  color: #fff;
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-2) 100%);
  box-shadow: 0 12px 28px -10px rgba(59, 130, 246, .6);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 16px 34px -10px rgba(59, 130, 246, .75); }
.btn-ghost { color: var(--text); background: var(--card); border: 1px solid var(--border); }
.btn-ghost:hover { border-color: var(--accent); transform: translateY(-2px); }

/* ===== Hero ===== */
.hero {
  display: grid; grid-template-columns: 1.1fr .9fr; gap: 48px;
  align-items: center; padding: 72px 24px 64px;
}
.hero-title { font-size: clamp(32px, 4.6vw, 54px); line-height: 1.16; font-weight: 800; margin: 22px 0 18px; letter-spacing: -.5px; }
.grad { background: linear-gradient(120deg, var(--accent-2), var(--accent)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero-sub { font-size: 16.5px; color: var(--muted); max-width: 520px; }
.hero-cta { display: flex; gap: 14px; margin-top: 28px; }

/* Hero art — CSS 3D scene */
.hero-art { position: relative; display: flex; align-items: center; justify-content: center; min-height: 400px; }
.art-glow {
  position: absolute; width: 78%; height: 78%; border-radius: 50%;
  background: radial-gradient(circle, rgba(56, 189, 248, .26), transparent 62%);
  filter: blur(28px); pointer-events: none;
}
.scene { position: relative; z-index: 1; width: 100%; max-width: 480px; aspect-ratio: 1 / 0.92; perspective: 1200px; }
.stage {
  position: absolute; inset: 0;
  transform-style: preserve-3d;
  transform: rotateX(11deg) rotateY(-26deg);
  animation: sway 11s ease-in-out infinite;
}
@keyframes sway {
  0%, 100% { transform: rotateX(11deg) rotateY(-26deg); }
  50%      { transform: rotateX(9deg)  rotateY(-19deg); }
}

/* floor grid laid flat in 3D */
.floor {
  position: absolute; left: -20%; right: -20%; bottom: 8%; height: 150%;
  transform: rotateX(80deg) translateZ(-70px);
  transform-origin: bottom center;
  background:
    linear-gradient(to right, rgba(90, 209, 255, .14) 1px, transparent 1px) 0 0 / 38px 38px,
    linear-gradient(to bottom, rgba(90, 209, 255, .14) 1px, transparent 1px) 0 0 / 38px 38px;
  -webkit-mask-image: radial-gradient(ellipse at center, #000 35%, transparent 72%);
          mask-image: radial-gradient(ellipse at center, #000 35%, transparent 72%);
}

/* generic floating panels */
.card3d {
  position: absolute; border-radius: 14px;
  background: linear-gradient(155deg, #15294a 0%, #0b1730 100%);
  border: 1px solid #2c4575;
  box-shadow: 0 26px 50px -18px rgba(0, 0, 0, .7), inset 0 1px 0 rgba(120, 170, 240, .12);
  padding: 14px; overflow: hidden;
}
.browser {
  top: 6%; right: -2%; width: 52%; height: 36%;
  transform: translateZ(26px) rotateY(7deg);
}
.server {
  bottom: 6%; left: -2%; width: 48%; height: 34%;
  transform: translateZ(58px) rotateY(7deg);
  display: flex; flex-direction: column; justify-content: center; gap: 10px;
}
.dot { position: absolute; top: 14px; width: 7px; height: 7px; border-radius: 50%; }
.d-r { left: 14px; background: #ff6b6b; }
.d-y { left: 26px; background: #ffd166; }
.d-g { left: 38px; background: #4cd964; }
.browser .bar { display: block; height: 7px; border-radius: 4px; background: #26406e; margin-top: 9px; }
.browser .bar:first-of-type { margin-top: 30px; }
.browser .bar.accent { background: linear-gradient(90deg, var(--accent), var(--accent-2)); width: 70%; }
.browser .bar.short { width: 48%; }
.rack { display: block; height: 16px; border-radius: 5px; background: #16294a; position: relative; }
.rack::after { content: ""; position: absolute; right: 10px; top: 50%; transform: translateY(-50%); width: 6px; height: 6px; border-radius: 50%; background: var(--accent-2); box-shadow: 0 0 8px var(--accent-2); }

/* light-theme 3D scene: panels & floor adapt to the light background */
[data-theme="light"] .card3d {
  background: linear-gradient(155deg, #ffffff 0%, #e9f0fb 100%);
  border-color: #d3e0f1;
  box-shadow: 0 22px 44px -18px rgba(40, 80, 160, .28), inset 0 1px 0 rgba(255, 255, 255, .7);
}
[data-theme="light"] .browser .bar { background: #ccd9ee; }
[data-theme="light"] .rack { background: #e4ebf7; }
[data-theme="light"] .floor {
  background:
    linear-gradient(to right, rgba(59, 130, 246, .16) 1px, transparent 1px) 0 0 / 38px 38px,
    linear-gradient(to bottom, rgba(59, 130, 246, .16) 1px, transparent 1px) 0 0 / 38px 38px;
}
/* light-theme shield: lighten the near-black face & sides to a vivid blue */
[data-theme="light"] .shield3d #face stop:nth-child(1) { stop-color: #6aa6f5; }
[data-theme="light"] .shield3d #face stop:nth-child(2) { stop-color: #3f82e6; }
[data-theme="light"] .shield3d #face stop:nth-child(3) { stop-color: #2660c9; }
[data-theme="light"] .shield3d .sh-side   { fill: #9dc0f2; }
[data-theme="light"] .shield3d .sh-bridge { fill: #6fa0e6; }

/* extruded shield popped to front */
.shield3d {
  position: absolute; left: 50%; top: 48%; width: 46%;
  transform: translate(-50%, -50%) translateZ(110px);
  animation: floatZ 5.5s ease-in-out infinite;
  filter: drop-shadow(0 22px 30px rgba(0, 0, 0, .55)) drop-shadow(0 0 22px rgba(56, 189, 248, .45));
}
.shield3d svg { width: 100%; height: auto; display: block; }
@keyframes floatZ {
  0%, 100% { transform: translate(-50%, -50%) translateZ(110px) translateY(-6px); }
  50%      { transform: translate(-50%, -50%) translateZ(110px) translateY(8px); }
}

/* tags float at the very front */
.art-tag {
  position: absolute; font-size: 12.5px; font-weight: 600;
  padding: 6px 12px; border-radius: 9px; white-space: nowrap;
  background: color-mix(in srgb, var(--accent) 30%, var(--card));
  border: 1px solid color-mix(in srgb, var(--accent) 60%, var(--border));
  color: var(--text); box-shadow: 0 8px 20px -8px rgba(56, 189, 248, .7);
}
.art-tag-1 { top: 8%;  right: 2%;  transform: translateZ(150px); }
.art-tag-2 { bottom: 26%; left: -4%; transform: translateZ(120px); }
.art-tag-3 { top: 30%; left: -6%;  transform: translateZ(135px); }
.art-tag-4 { top: 52%; right: -4%; transform: translateZ(110px); }
.art-tag-5 { bottom: 6%; right: 12%; transform: translateZ(95px); }
.art-tag-6 { top: 2%; left: 18%; transform: translateZ(80px); }
/* secondary tags read a touch softer / smaller for depth */
.art-tag-4, .art-tag-5, .art-tag-6 { font-size: 11.5px; padding: 5px 10px; opacity: .92; }

/* glowing nodes */
.node3d { position: absolute; width: 9px; height: 9px; border-radius: 50%; background: var(--accent-2); box-shadow: 0 0 14px var(--accent-2); animation: pulse 3s ease-in-out infinite; }
.n1 { top: 22%; left: 14%; transform: translateZ(90px); }
.n2 { top: 38%; right: 16%; transform: translateZ(80px); animation-delay: 1s; }
.n3 { bottom: 30%; right: 30%; transform: translateZ(70px); animation-delay: 1.8s; }

@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: .35; } }

/* ===== Cards / layout ===== */
.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; padding-top: 28px; padding-bottom: 28px; }
.card {
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 28px;
  transition: transform .25s, border-color .25s;
}
.card-title { font-size: 19px; font-weight: 700; margin-bottom: 14px; display: flex; align-items: center; gap: 9px; }
.ci { color: var(--accent-2); }
.card p { color: var(--text); margin-bottom: 12px; }
.card p:last-child { margin-bottom: 0; }
.muted { color: var(--muted); }
.check-list { list-style: none; display: flex; flex-direction: column; gap: 13px; }
.check-list li { position: relative; padding-left: 26px; color: var(--text); }
.check-list li::before {
  content: "✔"; position: absolute; left: 0; top: 0;
  color: var(--accent-2); font-size: 13px;
  width: 18px; height: 18px; border-radius: 50%;
  background: color-mix(in srgb, var(--accent) 18%, transparent);
  display: inline-flex; align-items: center; justify-content: center;
}

/* ===== Section titles ===== */
.section-title { text-align: center; font-size: clamp(24px, 3vw, 32px); font-weight: 800; margin: 56px 0 32px; letter-spacing: -.4px; }
.section-title.left { text-align: left; margin-top: 0; }
.section-sub { text-align: center; max-width: 760px; margin: -16px auto 30px; font-size: 15px; }
.sub-title { font-size: 19px; font-weight: 700; margin: 30px 0 16px; }

/* ===== Low-copy flow diagram ===== */
.flow-card { padding: 30px 24px; overflow-x: auto; }
.flow-svg { width: 100%; min-width: 720px; height: auto; display: block; }
.flow-box { fill: var(--card-2); stroke: #2c4575; stroke-width: 1.5; }
.flow-box.hot { stroke: var(--accent-2); fill: color-mix(in srgb, var(--accent) 16%, var(--card-2)); }
.flow-title { fill: var(--text); font-size: 17px; font-weight: 700; text-anchor: middle; font-family: inherit; }
.flow-title.sm { font-size: 14px; }
.flow-note { fill: var(--muted); font-size: 12.5px; text-anchor: middle; font-family: inherit; }
.flow-in { fill: var(--accent-2); font-size: 14px; font-weight: 600; text-anchor: start; font-family: inherit; }
.flow-edge { fill: var(--muted); font-size: 12px; text-anchor: middle; font-family: "SFMono-Regular", Consolas, monospace; }
.flow-line { stroke: #4a8fd6; stroke-width: 1.6; }
.flow-row { fill: var(--accent-2); font-size: 13px; font-weight: 700; text-anchor: start; letter-spacing: .5px; font-family: inherit; text-transform: uppercase; }

/* ===== Features ===== */
.feature-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; }
.feature { display: flex; flex-direction: column; gap: 12px; }
.feature:hover, .lang:hover { transform: translateY(-5px); border-color: color-mix(in srgb, var(--accent) 55%, var(--border)); }
.feat-icon, .lang-icon {
  width: 46px; height: 46px; border-radius: 12px;
  display: inline-flex; align-items: center; justify-content: center;
  font-size: 22px;
  background: color-mix(in srgb, var(--accent) 16%, var(--card-2));
  border: 1px solid color-mix(in srgb, var(--accent) 35%, var(--border));
}
.feature h4, .lang h4 { font-size: 17px; font-weight: 700; }
.feature p, .lang p { color: var(--muted); font-size: 14.5px; }

/* ===== Compare ===== */
.compare { align-items: center; }
.compare-copy { display: flex; flex-direction: column; align-items: flex-start; gap: 18px; }
.table-card { padding: 8px 8px; }
.cmp-table { width: 100%; border-collapse: collapse; }
.cmp-table th, .cmp-table td { padding: 14px 20px; text-align: left; font-size: 15px; }
.cmp-table thead th { color: var(--muted); font-weight: 600; border-bottom: 1px solid var(--border); }
.cmp-table thead th:not(:first-child), .cmp-table td:not(:first-child) { text-align: center; }
.cmp-table tbody tr { border-bottom: 1px solid var(--border-soft); }
.cmp-table tbody tr:last-child { border-bottom: none; }
.cmp-table .ok { color: var(--ok); font-size: 17px; }
.cmp-table .no { color: var(--no); font-size: 17px; }
.cmp-table .warn { color: var(--warn); font-size: 17px; }

/* ===== Languages ===== */
.lang-grid { display: grid; grid-template-columns: repeat(6, 1fr); gap: 18px; }
.lang { display: flex; flex-direction: column; gap: 10px; padding: 22px; }
.lang-icon { font-size: 20px; }

/* ===== Roadmap ===== */
.roadmap-row { grid-template-columns: 1.6fr 1fr; align-items: stretch; }
.roadmap-main { display: flex; flex-direction: column; }
.steps { display: flex; align-items: center; gap: 16px; flex-wrap: wrap; margin-top: 8px; }
.step { display: flex; flex-direction: column; gap: 12px; min-width: 140px; }
.step-num {
  width: 44px; height: 44px; border-radius: 50%;
  display: inline-flex; align-items: center; justify-content: center;
  font-weight: 700; color: #fff;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  box-shadow: 0 8px 22px -8px rgba(59, 130, 246, .7);
}
.step p { font-size: 14.5px; color: var(--text); }
.step-arrow { color: var(--muted); font-size: 22px; }
.link-card { display: flex; flex-direction: column; gap: 12px; background: linear-gradient(160deg, var(--card-2), var(--card)); }
.link-arrow { color: var(--accent-2); font-weight: 600; margin-top: 4px; }
.link-arrow:hover { text-decoration: underline; }

/* ===== Ecosystem grid ===== */
.eco-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.eco { display: flex; flex-direction: column; gap: 12px; }
.eco:hover { transform: translateY(-5px); border-color: color-mix(in srgb, var(--accent) 55%, var(--border)); }
.eco-icon {
  width: 46px; height: 46px; border-radius: 12px;
  display: inline-flex; align-items: center; justify-content: center; font-size: 22px;
  background: color-mix(in srgb, var(--accent) 16%, var(--card-2));
  border: 1px solid color-mix(in srgb, var(--accent) 35%, var(--border));
}
.eco h4 { font-size: 17px; font-weight: 700; }
.eco p { color: var(--muted); font-size: 14.5px; }

/* ===== Install bar ===== */
.install-bar {
  display: flex; align-items: center; gap: 12px; flex-wrap: wrap;
  padding: 12px 16px; margin-bottom: 16px;
  background: var(--card); border: 1px solid var(--border); border-radius: 12px;
}
.install-label {
  font-size: 12px; font-weight: 700; color: var(--accent-2);
  padding: 3px 9px; border-radius: 6px;
  background: color-mix(in srgb, var(--accent) 16%, transparent);
  border: 1px solid color-mix(in srgb, var(--accent) 36%, var(--border));
}
.install-cmd {
  flex: 1; min-width: 0; font-family: "SFMono-Regular", "JetBrains Mono", Consolas, monospace;
  font-size: 14px; color: var(--code-fg); overflow-x: auto; white-space: nowrap;
}
.install-copy { margin-left: 0; }

/* ===== Code / quick start ===== */
.code-block { padding: 0; overflow: hidden; }
.code-tabs { display: flex; align-items: center; gap: 4px; padding: 8px 10px; border-bottom: 1px solid var(--border); background: var(--card-2); }
.code-tab {
  background: transparent; border: none; cursor: pointer;
  color: var(--muted); font-size: 14px; font-weight: 600;
  padding: 8px 16px; border-radius: 9px; transition: background .2s, color .2s;
}
.code-tab:hover { color: var(--text); }
.code-tab.active { color: var(--text); background: color-mix(in srgb, var(--accent) 18%, var(--card)); }
.copy-btn {
  margin-left: auto; background: var(--card); border: 1px solid var(--border);
  color: var(--muted); cursor: pointer; font-size: 13px; font-weight: 600;
  padding: 7px 14px; border-radius: 9px; transition: border-color .2s, color .2s;
}
.copy-btn:hover { color: var(--text); border-color: var(--accent); }
.code-pane {
  display: none; margin: 0; padding: 22px 24px; overflow-x: auto;
  font-family: "SFMono-Regular", "JetBrains Mono", Consolas, "Courier New", monospace;
  font-size: 14px; line-height: 1.7; color: var(--code-fg);
}
.code-pane.active { display: block; }
.code-pane code { white-space: pre; }
.code-note { text-align: center; margin-top: 18px; font-size: 14px; }
.code-note a { color: var(--accent-2); }
.code-note a:hover { text-decoration: underline; }

/* link variants of pills / lang cards */
a.pill { transition: border-color .2s, color .2s, transform .2s; }
a.pill:hover { color: var(--accent-2); border-color: var(--accent); transform: translateY(-1px); }
.lang em {
  font-style: normal; font-size: 11px; font-weight: 600; vertical-align: middle;
  margin-left: 6px; padding: 2px 7px; border-radius: 6px; color: var(--accent-2);
  background: color-mix(in srgb, var(--accent) 16%, transparent);
  border: 1px solid color-mix(in srgb, var(--accent) 38%, var(--border));
}

/* ===== Footer ===== */
.footer { border-top: 1px solid var(--border-soft); margin-top: 80px; padding: 48px 0 28px; }
.footer-cols { display: grid; grid-template-columns: 1.6fr 1fr 1fr 1fr; gap: 32px; padding-bottom: 36px; }
.footer-brand { display: flex; flex-direction: column; gap: 12px; max-width: 320px; }
.footer-brand .muted { font-size: 14px; }
.last-update { font-size: 12.5px; }
.last-update::before { content: "🕓 "; }
.ver-pill {
  align-self: flex-start; font-size: 12.5px; color: var(--accent-2);
  padding: 5px 12px; border-radius: 999px;
  background: color-mix(in srgb, var(--accent) 14%, var(--card));
  border: 1px solid color-mix(in srgb, var(--accent) 40%, var(--border));
  transition: border-color .2s, transform .2s;
}
a.ver-pill:hover { border-color: var(--accent); transform: translateY(-1px); }
.footer-col { display: flex; flex-direction: column; gap: 11px; }
.footer-col h5 { font-size: 14px; font-weight: 700; margin-bottom: 4px; }
.footer-col a, .footer-col .muted { font-size: 14px; color: var(--muted); transition: color .2s; }
.footer-col a:hover { color: var(--text); }
.footer-bottom { display: flex; align-items: center; gap: 18px; padding-top: 24px; border-top: 1px solid var(--border-soft); }
.footer-bottom .muted { margin-right: auto; font-size: 13.5px; }
.footer-icons { display: flex; gap: 16px; align-items: center; color: var(--muted); }
.footer-icons a { transition: color .2s; }
.footer-icons a:hover { color: var(--text); }
.footer-beian {
  display: flex; flex-wrap: wrap; align-items: center; justify-content: center;
  gap: 8px; padding-top: 16px; font-size: 13px; color: var(--muted);
}
.footer-beian .beian-link { color: var(--muted); transition: color .2s; display: inline-flex; align-items: center; gap: 5px; }
.footer-beian .beian-link:hover { color: var(--accent-2); }
.footer-beian img { height: 15px; width: auto; }

/* ===== Responsive ===== */
@media (max-width: 900px) {
  .nav-links { display: none; }
  .hero { grid-template-columns: 1fr; padding-top: 48px; }
  .hero-art { order: -1; min-height: 240px; }
  .two-col, .roadmap-row { grid-template-columns: 1fr; }
  .feature-grid { grid-template-columns: 1fr 1fr; }
  .lang-grid { grid-template-columns: 1fr 1fr 1fr; }
  .eco-grid { grid-template-columns: 1fr 1fr; }
  .footer-cols { grid-template-columns: 1fr 1fr; }
  .compare-copy { align-items: flex-start; }
}
@media (max-width: 560px) {
  .feature-grid, .lang-grid, .eco-grid, .footer-cols { grid-template-columns: 1fr 1fr; }
  .code-tab { padding: 7px 11px; font-size: 13px; }
  .footer-brand { grid-column: 1 / -1; }
  .ghost-link, .star-label { display: none; }
  .hero-cta { flex-direction: column; align-items: stretch; }
  .steps { flex-direction: column; align-items: flex-start; }
  .step-arrow { transform: rotate(90deg); }
  .footer-inner { flex-wrap: wrap; }

  /* hero 3D art: front-facing on mobile so rotation can't push tags off-screen,
     all tags kept but edge-anchored & flattened (no translateZ) to avoid clipping */
  .hero-art { min-height: 320px; }
  .scene { max-width: 300px; }
  .stage { transform: rotateX(6deg) rotateY(0deg); animation: none; }
  .art-tag { font-size: 11px; padding: 4px 9px; }
  /* push tags in front of the panels (translateZ 26–58) so none get hidden */
  .art-tag-1, .art-tag-2, .art-tag-3,
  .art-tag-4, .art-tag-5, .art-tag-6 { transform: translateZ(80px); }
  .art-tag-3 { top: 4%;    left: 4%;  bottom: auto; right: auto; } /* JA3 / JA4   (top-left) */
  .art-tag-1 { top: 4%;    right: 4%; bottom: auto; left: auto; }  /* TLS Fingerprint (top-right) */
  .art-tag-6 { top: 35%;   left: 3%;  bottom: auto; right: auto; } /* SOCKS5      (mid-left) */
  .art-tag-4 { top: 41%;   right: 4%; bottom: auto; left: auto; }  /* Async       (mid-right) */
  .art-tag-2 { bottom: 24%; left: 4%; top: auto; right: auto; }    /* HTTP/2      (bottom-left) */
  .art-tag-5 { bottom: 7%; right: 6%; top: auto; left: auto; }     /* WebSocket   (bottom-right) */
  .code-tabs { flex-wrap: wrap; }
  .install-cmd { font-size: 13px; }

  /* Roadmap centered on mobile */
  .roadmap-main { align-items: center; text-align: center; }
  .roadmap-main .section-title.left { text-align: center; }
  .steps { align-items: center; }
  .step { align-items: center; text-align: center; }
}