/* ============================================================
   lib-filetransfer — landing page styles
   Dark-first, with an explicit light theme via [data-theme].
   ============================================================ */

:root {
  --bg: #0a0e17;
  --bg-2: #0d1220;
  --surface: rgba(255, 255, 255, 0.028);
  --surface-2: rgba(255, 255, 255, 0.045);
  --border: rgba(255, 255, 255, 0.09);
  --border-strong: rgba(255, 255, 255, 0.16);
  --text: #e8eef7;
  --text-muted: #93a1b6;
  --text-faint: #5f6c81;

  --sky: #38bdf8;
  --indigo: #818cf8;
  --violet: #c084fc;
  --accent: #7aa2ff;
  --grad: linear-gradient(100deg, #38bdf8, #818cf8 55%, #c084fc);

  --ok: #34d399;
  --warn: #fbbf24;
  --drop: #fb7185;

  --radius: 16px;
  --radius-sm: 10px;
  --shadow: 0 20px 60px -20px rgba(0, 0, 0, 0.6);
  --maxw: 1120px;
  --mono: ui-monospace, "SF Mono", "JetBrains Mono", "Fira Code", Menlo, Consolas, monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, Roboto, Helvetica, Arial, sans-serif;
}

:root[data-theme="light"] {
  --bg: #f7f9fc;
  --bg-2: #eef2f8;
  --surface: rgba(15, 23, 42, 0.025);
  --surface-2: rgba(15, 23, 42, 0.05);
  --border: rgba(15, 23, 42, 0.1);
  --border-strong: rgba(15, 23, 42, 0.18);
  --text: #10151f;
  --text-muted: #4a5769;
  --text-faint: #8592a6;
  --accent: #4f6bed;
  --shadow: 0 20px 50px -24px rgba(30, 41, 59, 0.35);
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  font-family: var(--sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.wrap { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }

.grad {
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.skip-link {
  position: absolute; left: -999px; top: 0; z-index: 100;
  background: var(--accent); color: #fff; padding: 10px 16px; border-radius: 0 0 8px 0;
}
.skip-link:focus { left: 0; }

/* ───────────────────────── Header ───────────────────────── */
.site-header {
  position: sticky; top: 0; z-index: 50;
  backdrop-filter: saturate(160%) blur(14px);
  background: color-mix(in srgb, var(--bg) 78%, transparent);
  border-bottom: 1px solid var(--border);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 700; color: var(--text); font-size: 1.02rem; }
.brand:hover { text-decoration: none; }
.brand-mark { width: 28px; height: 28px; }
.brand.small .brand-mark { width: 22px; height: 22px; }
.header-nav { display: flex; align-items: center; gap: 22px; }
.header-nav a { color: var(--text-muted); font-size: 0.93rem; font-weight: 500; }
.header-nav a:hover { color: var(--text); text-decoration: none; }
.header-gh { display: inline-flex; color: var(--text-muted); }
.header-gh:hover { color: var(--text); }

.theme-toggle {
  display: inline-flex; align-items: center; justify-content: center;
  width: 34px; height: 34px; border-radius: 9px;
  border: 1px solid var(--border); background: var(--surface); color: var(--text-muted);
  cursor: pointer; transition: color .2s, border-color .2s;
}
.theme-toggle:hover { color: var(--text); border-color: var(--border-strong); }
.icon-moon { display: none; }
:root[data-theme="light"] .icon-sun { display: none; }
:root[data-theme="light"] .icon-moon { display: block; }

/* ───────────────────────── Buttons ───────────────────────── */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 11px 20px; border-radius: 11px; font-weight: 600; font-size: 0.95rem;
  border: 1px solid transparent; cursor: pointer; transition: transform .12s ease, box-shadow .2s, background .2s, border-color .2s;
  font-family: inherit;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn:active { transform: translateY(0); }
.btn-primary { background: var(--grad); color: #0a0e17; box-shadow: 0 8px 24px -8px rgba(129, 140, 248, 0.6); }
:root[data-theme="light"] .btn-primary { color: #fff; }
.btn-primary:hover { box-shadow: 0 12px 30px -8px rgba(129, 140, 248, 0.75); }
.btn-primary:disabled { opacity: 0.45; cursor: not-allowed; transform: none; box-shadow: none; }
.btn-ghost { background: var(--surface); border-color: var(--border); color: var(--text); }
.btn-ghost:hover { background: var(--surface-2); border-color: var(--border-strong); }
.btn-small { padding: 8px 14px; font-size: 0.85rem; border-radius: 9px; background: var(--surface); border: 1px solid var(--border); color: var(--text); }
.btn-small:hover { background: var(--surface-2); border-color: var(--border-strong); }
.btn-file { cursor: pointer; }

/* ───────────────────────── Install pill ───────────────────────── */
.install {
  display: inline-flex; align-items: center; gap: 12px;
  background: var(--surface); border: 1px solid var(--border);
  border-radius: 12px; padding: 6px 6px 6px 16px; margin: 26px 0 30px;
  max-width: 100%;
}
.install code { font-family: var(--mono); font-size: 0.92rem; color: var(--text); white-space: nowrap; overflow-x: auto; }
.copy-btn {
  display: inline-flex; align-items: center; gap: 6px;
  background: var(--surface-2); border: 1px solid var(--border); color: var(--text-muted);
  border-radius: 8px; padding: 7px 11px; font-size: 0.82rem; font-weight: 600; cursor: pointer;
  font-family: inherit; transition: color .15s, border-color .15s, background .15s; flex-shrink: 0;
}
.copy-btn:hover { color: var(--text); border-color: var(--border-strong); }
.copy-btn.copied { color: var(--ok); border-color: color-mix(in srgb, var(--ok) 50%, transparent); }
.copy-btn.ghost { background: transparent; border-color: transparent; padding: 5px 8px; }

/* ───────────────────────── Hero ───────────────────────── */
.hero { position: relative; padding: clamp(48px, 8vw, 96px) 0 clamp(56px, 8vw, 100px); overflow: hidden; }
.hero-glow {
  position: absolute; inset: -20% -10% auto -10%; height: 620px; z-index: 0; pointer-events: none;
  background:
    radial-gradient(closest-side, rgba(56, 189, 248, 0.20), transparent) 12% 30% / 55% 80% no-repeat,
    radial-gradient(closest-side, rgba(192, 132, 252, 0.18), transparent) 82% 10% / 55% 80% no-repeat,
    radial-gradient(closest-side, rgba(129, 140, 248, 0.16), transparent) 55% 60% / 60% 90% no-repeat;
  filter: blur(6px);
}
.hero-inner { position: relative; z-index: 1; display: grid; grid-template-columns: 1.15fr 0.85fr; gap: 48px; align-items: center; }
.eyebrow { text-transform: uppercase; letter-spacing: 0.14em; font-size: 0.76rem; font-weight: 700; color: var(--accent); margin: 0 0 18px; }
.hero h1 { font-size: clamp(2.4rem, 5.4vw, 4rem); line-height: 1.04; letter-spacing: -0.02em; margin: 0 0 22px; font-weight: 800; }
.lede { font-size: clamp(1.02rem, 1.6vw, 1.18rem); color: var(--text-muted); max-width: 40ch; margin: 0; }
.lede strong { color: var(--text); font-weight: 600; }
.hero-cta { display: flex; flex-wrap: wrap; gap: 12px; }
.hero-badges { display: flex; flex-wrap: wrap; gap: 10px 20px; list-style: none; padding: 0; margin: 30px 0 0; color: var(--text-muted); font-size: 0.9rem; }

/* Hero art */
.hero-art { position: relative; height: 340px; border: 1px solid var(--border); border-radius: 20px; background: linear-gradient(180deg, var(--surface), transparent); overflow: hidden; }
.node {
  position: absolute; top: 50%; transform: translateY(-50%);
  width: 96px; height: 96px; border-radius: 20px;
  display: grid; place-items: center; text-align: center;
  background: var(--surface-2); border: 1px solid var(--border-strong);
  font-size: 0.78rem; color: var(--text-muted); font-weight: 600;
}
.node span { display: block; }
.node-a { left: 26px; box-shadow: 0 0 0 1px rgba(56,189,248,.25), 0 10px 40px -12px rgba(56,189,248,.5); }
.node-b { right: 26px; box-shadow: 0 0 0 1px rgba(192,132,252,.25), 0 10px 40px -12px rgba(192,132,252,.5); }
.node::before {
  content: ""; position: absolute; inset: 0; border-radius: 20px; padding: 1px;
  background: var(--grad); -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor; mask-composite: exclude; opacity: .5;
}
.wire { position: absolute; top: 50%; left: 122px; right: 122px; height: 2px; transform: translateY(-50%); background: repeating-linear-gradient(90deg, var(--border-strong) 0 8px, transparent 8px 16px); }
.packets { position: absolute; top: 50%; left: 122px; right: 122px; height: 0; }
.packets i {
  position: absolute; top: calc(-7px + var(--y, 0px)); left: 0; width: 16px; height: 14px; border-radius: 4px;
  box-shadow: 0 0 12px rgba(129,140,248,.7); opacity: 0;
}
.packets i.ok { background: var(--grad); animation: heroFly 5s linear infinite; animation-delay: var(--d); }
.packets i.retry { background: linear-gradient(100deg, #f59e0b, #fbbf24); box-shadow: 0 0 12px rgba(251,191,36,.7); animation: heroFly 5s linear infinite; animation-delay: var(--d); }
.packets i.retry::after { content: "↻"; position: absolute; top: -14px; left: 50%; transform: translateX(-50%); font-size: 11px; font-weight: 800; color: #fbbf24; }
.packets i.lost { animation: heroLost 5s ease-in infinite; animation-delay: var(--d); }
.packets i.lost::after { content: "✗"; position: absolute; top: -14px; left: 50%; transform: translateX(-50%); font-size: 11px; font-weight: 800; color: var(--drop); }
@keyframes heroFly {
  0% { left: 0; opacity: 0; }
  5% { opacity: 1; }
  30% { opacity: 1; }
  35% { left: 100%; opacity: 0; }
  100% { left: 100%; opacity: 0; }
}
@keyframes heroLost {
  0% { left: 0; opacity: 0; transform: translateY(0) rotate(0); background: #818cf8; }
  5% { opacity: 1; }
  16% { left: 46%; opacity: 1; transform: translateY(0) rotate(0); background: #818cf8; }
  22% { background: var(--drop); box-shadow: 0 0 12px var(--drop); }
  32% { left: 46%; opacity: 0; transform: translateY(52px) rotate(20deg); background: var(--drop); }
  100% { left: 46%; opacity: 0; transform: translateY(52px); background: var(--drop); }
}
.art-caption {
  position: absolute; left: 0; right: 0; bottom: 14px; text-align: center;
  font-size: 0.76rem; color: var(--text-muted); font-weight: 500; letter-spacing: 0.01em;
}

/* ───────────────────────── Sections ───────────────────────── */
.section { padding: clamp(56px, 8vw, 96px) 0; border-top: 1px solid var(--border); }
.kicker { text-transform: uppercase; letter-spacing: 0.14em; font-size: 0.74rem; font-weight: 700; color: var(--accent); margin: 0 0 12px; }
.section-title { font-size: clamp(1.7rem, 3.4vw, 2.5rem); line-height: 1.12; letter-spacing: -0.02em; margin: 0 0 16px; font-weight: 800; max-width: 22ch; }
.section-sub { color: var(--text-muted); font-size: 1.05rem; max-width: 62ch; margin: 0 0 44px; }
.section-sub strong { color: var(--text); }
.section-foot { color: var(--text-muted); margin-top: 26px; }

/* Features */
.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.feature {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 26px; transition: transform .18s ease, border-color .2s, background .2s;
}
.feature:hover { transform: translateY(-3px); border-color: var(--border-strong); background: var(--surface-2); }
.feature-icon { font-size: 1.6rem; margin-bottom: 12px; }
.feature h3 { margin: 0 0 8px; font-size: 1.12rem; }
.feature p { margin: 0; color: var(--text-muted); font-size: 0.96rem; }
.feature code { font-family: var(--mono); font-size: 0.85em; background: var(--surface-2); padding: 1px 6px; border-radius: 5px; color: var(--text); }

/* ───────────────────────── Demo ───────────────────────── */
.section-demo { background: linear-gradient(180deg, var(--bg-2), var(--bg)); }
.demo {
  background: var(--surface); border: 1px solid var(--border); border-radius: 20px;
  padding: clamp(18px, 3vw, 30px); box-shadow: var(--shadow);
}
.demo-controls { display: flex; flex-wrap: wrap; gap: 24px 32px; align-items: flex-end; padding-bottom: 26px; border-bottom: 1px solid var(--border); }
.control { display: flex; flex-direction: column; gap: 8px; }
.control label { font-size: 0.82rem; font-weight: 600; color: var(--text-muted); display: flex; gap: 8px; align-items: baseline; }
.control output { color: var(--accent); font-family: var(--mono); font-size: 0.82rem; font-weight: 700; }
.file-row { display: flex; gap: 10px; flex-wrap: wrap; }
.file-name { margin: 0; font-size: 0.82rem; color: var(--text-faint); font-family: var(--mono); max-width: 260px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.sliders { display: grid; grid-template-columns: repeat(2, minmax(160px, 1fr)); gap: 20px 32px; flex: 1; min-width: 280px; }
.demo-actions { display: flex; gap: 10px; margin-left: auto; }

input[type="range"] {
  -webkit-appearance: none; appearance: none; width: 100%; height: 6px; border-radius: 6px;
  background: var(--surface-2); outline: none; cursor: pointer;
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none; appearance: none; width: 18px; height: 18px; border-radius: 50%;
  background: var(--grad); border: 2px solid var(--bg); box-shadow: 0 1px 6px rgba(0,0,0,.4);
}
input[type="range"]::-moz-range-thumb { width: 16px; height: 16px; border-radius: 50%; background: var(--indigo); border: 2px solid var(--bg); }

/* Stage */
.demo-stage { display: grid; grid-template-columns: 1fr 0.7fr 1fr; gap: 18px; padding: 28px 0; align-items: stretch; }
.stage-col { display: flex; flex-direction: column; gap: 10px; min-width: 0; }
.stage-head { font-size: 0.82rem; font-weight: 700; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.06em; display: flex; align-items: center; gap: 8px; }
.stage-head.center { justify-content: center; }
.dot { width: 9px; height: 9px; border-radius: 50%; }
.dot-a { background: var(--sky); box-shadow: 0 0 8px var(--sky); }
.dot-b { background: var(--violet); box-shadow: 0 0 8px var(--violet); }
.card { background: var(--bg-2); border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 16px; flex: 1; min-height: 190px; }
:root[data-theme="light"] .card { background: #fff; }
.card-empty { color: var(--text-faint); font-size: 0.9rem; display: grid; place-items: center; height: 100%; text-align: center; }

.sender-card .file-preview { display: flex; flex-direction: column; gap: 12px; height: 100%; align-items: center; }
.sender-card .thumb { width: 150px; height: 150px; max-width: 100%; border-radius: 10px; object-fit: cover; background: var(--surface-2); border: 1px solid var(--border); }
.sender-card .fp-icon { width: 150px; height: 150px; border-radius: 10px; display: grid; place-items: center; font-size: 2.6rem; background: var(--surface-2); border: 1px solid var(--border); }
.sender-card .meta-name, .sender-card .meta-row { align-self: stretch; }
.sender-card .meta-row { font-size: 0.82rem; color: var(--text-muted); }
.sender-card .meta-row b { color: var(--text); font-weight: 600; }
.sender-card .meta-name { font-family: var(--mono); font-size: 0.84rem; color: var(--text); word-break: break-all; }

/* Channel */
.stage-channel { display: flex; flex-direction: column; gap: 10px; }
.channel { position: relative; flex: 1; min-height: 190px; border-radius: var(--radius-sm); border: 1px dashed var(--border); overflow: hidden; }
.channel-line { display: none; }
.lane-guide { position: absolute; left: 10px; right: 10px; height: 0; transform: translateY(-50%); border-top: 1px dashed var(--border-strong); opacity: 0.5; }
.chan-end { position: absolute; top: 50%; width: 10px; height: 10px; border-radius: 50%; transform: translateY(-50%); z-index: 3; }
.chan-end.s { left: 5px; background: var(--sky); box-shadow: 0 0 10px var(--sky); }
.chan-end.r { right: 5px; background: var(--violet); box-shadow: 0 0 10px var(--violet); }
.pkt {
  position: absolute; left: 4%; width: 22px; height: 15px; border-radius: 4px; margin-top: -7.5px;
  display: grid; place-items: center; z-index: 2;
  background: var(--grad); box-shadow: 0 0 10px rgba(129,140,248,.6); will-change: left, transform, opacity;
  transition: left linear, transform .35s ease-in, opacity .35s;
}
.pkt-n { font-size: 8px; font-weight: 800; color: #0a0e17; font-family: var(--mono); line-height: 1; }
.pkt.retry { background: linear-gradient(100deg, #f59e0b, #fbbf24); box-shadow: 0 0 12px rgba(251,191,36,.75); }
.pkt.retry::after { content: "↻"; position: absolute; top: -13px; left: 50%; transform: translateX(-50%); font-size: 11px; font-weight: 800; color: var(--warn); }
.pkt.dropped { background: var(--drop) !important; box-shadow: 0 0 12px var(--drop); transform: translateY(48px) rotate(18deg); opacity: 0; }
.pkt.dropped::after { content: "✗"; position: absolute; top: -13px; left: 50%; transform: translateX(-50%); font-size: 11px; font-weight: 800; color: var(--drop); }
.channel-caption { text-align: center; font-size: 0.78rem; color: var(--text-faint); font-family: var(--mono); }
.chan-legend { display: flex; justify-content: center; gap: 14px; font-size: 0.72rem; color: var(--text-muted); }
.chan-legend span { display: inline-flex; align-items: center; gap: 5px; }
.chan-legend .lg { width: 10px; height: 10px; border-radius: 3px; }
.chan-legend .lg.data { background: var(--grad); }
.chan-legend .lg.retry { background: linear-gradient(100deg, #f59e0b, #fbbf24); }
.chan-legend .lg.lost { background: var(--drop); }

/* Receiver grid */
.receiver-card { display: flex; flex-direction: column; gap: 12px; }
.chunk-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(12px, 1fr)); gap: 3px; align-content: start; flex: 1; }
.cell { aspect-ratio: 1; border-radius: 2px; background: var(--surface-2); transition: background .18s, transform .18s; }
.cell.req { background: color-mix(in srgb, var(--warn) 55%, transparent); animation: pulse 1s ease-in-out infinite; }
.cell.recv { background: var(--grad); }
.cell.miss { background: color-mix(in srgb, var(--drop) 60%, transparent); }
@keyframes pulse { 50% { opacity: 0.5; } }
.progress { height: 8px; border-radius: 6px; background: var(--surface-2); overflow: hidden; }
.progress-bar { height: 100%; width: 0; background: var(--grad); border-radius: 6px; transition: width .2s ease; }
.result { display: flex; flex-direction: column; gap: 8px; align-items: center; }
.result img { width: 130px; height: 130px; object-fit: cover; border-radius: 8px; border: 1px solid var(--border); }
.result .ok-line { color: var(--ok); font-size: 0.85rem; font-weight: 600; text-align: center; align-self: stretch; }
.result .btn { align-self: stretch; }

/* Stats */
.demo-stats { display: grid; grid-template-columns: repeat(6, 1fr); gap: 1px; margin: 0; padding: 0; background: var(--border); border: 1px solid var(--border); border-radius: var(--radius-sm); overflow: hidden; }
.demo-stats > div { background: var(--bg-2); padding: 14px 16px; }
:root[data-theme="light"] .demo-stats > div { background: #fff; }
.demo-stats dt { font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.06em; color: var(--text-faint); margin-bottom: 4px; }
.demo-stats dd { margin: 0; font-family: var(--mono); font-size: 1.02rem; font-weight: 700; color: var(--text); }
.demo-note { margin: 18px 0 0; font-size: 0.85rem; color: var(--text-muted); min-height: 1.2em; }
.demo-note.err { color: var(--drop); }

/* ───────────────────────── Steps ───────────────────────── */
.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.step { position: relative; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 24px; }
.step-num { display: inline-grid; place-items: center; width: 34px; height: 34px; border-radius: 10px; background: var(--grad); color: #0a0e17; font-weight: 800; margin-bottom: 14px; }
:root[data-theme="light"] .step-num { color: #fff; }
.step h3 { margin: 0 0 6px; font-size: 1.08rem; }
.step p { margin: 0; color: var(--text-muted); font-size: 0.94rem; }
.step code { font-family: var(--mono); font-size: 0.85em; background: var(--surface-2); padding: 1px 5px; border-radius: 5px; }

/* ───────────────────────── Code ───────────────────────── */
.section-code { background: linear-gradient(180deg, var(--bg), var(--bg-2)); }
.code-tabs { border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; background: var(--bg-2); }
:root[data-theme="light"] .code-tabs { background: #0d1220; --text: #e8eef7; --text-muted: #93a1b6; }
.tab-bar { display: flex; gap: 2px; padding: 8px 8px 0; background: rgba(255,255,255,0.02); border-bottom: 1px solid var(--border); }
.tab { background: transparent; border: none; color: #93a1b6; font-family: var(--mono); font-size: 0.85rem; padding: 9px 16px; border-radius: 8px 8px 0 0; cursor: pointer; font-weight: 600; }
.tab:hover { color: #e8eef7; }
.tab.active { background: #0d1220; color: #e8eef7; }
:root[data-theme="light"] .tab.active { background: #0d1220; }
.tab-panel { display: none; }
.tab-panel.active { display: block; }
.code-block { position: relative; }
.code-head { display: flex; align-items: center; justify-content: space-between; padding: 10px 16px; font-family: var(--mono); font-size: 0.78rem; color: #93a1b6; border-bottom: 1px solid rgba(255,255,255,0.06); }
.code-head .copy-btn { color: #93a1b6; }
.code-head .copy-btn:hover { color: #e8eef7; }
pre.code { margin: 0; padding: 20px 22px; overflow-x: auto; font-family: var(--mono); font-size: 0.86rem; line-height: 1.7; color: #dbe4f0; background: #0d1220; }
pre.code code { font-family: inherit; white-space: pre; }
.tok-key { color: #c084fc; }
.tok-str { color: #7dd3a8; }
.tok-com { color: #5f6c81; font-style: italic; }
.tok-num { color: #fbbf24; }
.tok-fn { color: #38bdf8; }
.tok-type { color: #818cf8; }

/* ───────────────────────── Final CTA ───────────────────────── */
.section-cta { text-align: center; border-top: 1px solid var(--border); }
.cta-inner { display: flex; flex-direction: column; align-items: center; }
.section-cta h2 { font-size: clamp(1.8rem, 3.6vw, 2.6rem); margin: 0 0 12px; letter-spacing: -0.02em; }
.section-cta p { color: var(--text-muted); font-size: 1.08rem; margin: 0 0 8px; }
.install-lg { margin: 22px 0 26px; padding: 8px 8px 8px 20px; }
.install-lg code { font-size: 1rem; }
.cta-links { display: flex; flex-wrap: wrap; gap: 12px; justify-content: center; }

/* ───────────────────────── Footer ───────────────────────── */
.site-footer { border-top: 1px solid var(--border); padding: 48px 0 32px; background: var(--bg-2); }
.footer-inner { display: flex; justify-content: space-between; gap: 32px; flex-wrap: wrap; padding-bottom: 28px; border-bottom: 1px solid var(--border); }
.footer-tag { color: var(--text-muted); font-size: 0.92rem; margin: 12px 0 0; max-width: 34ch; }
.footer-links { display: flex; flex-direction: column; gap: 10px; }
.footer-links a { color: var(--text-muted); font-size: 0.92rem; }
.footer-links a:hover { color: var(--text); }
.footer-bottom { display: flex; justify-content: space-between; gap: 16px; padding-top: 22px; color: var(--text-faint); font-size: 0.85rem; flex-wrap: wrap; }

/* ───────────────────────── Responsive ───────────────────────── */
@media (max-width: 900px) {
  .hero-inner { grid-template-columns: 1fr; }
  .hero-art { order: -1; height: 220px; }
  .feature-grid { grid-template-columns: repeat(2, 1fr); }
  .steps { grid-template-columns: repeat(2, 1fr); }
  .demo-stage { grid-template-columns: 1fr; }
  .stage-channel { order: 3; }
  .channel { min-height: 90px; }
  .demo-stats { grid-template-columns: repeat(3, 1fr); }
  .demo-actions { margin-left: 0; width: 100%; }
  .demo-actions .btn { flex: 1; }
}
@media (max-width: 620px) {
  .header-nav a:not(.header-gh) { display: none; }
  .feature-grid { grid-template-columns: 1fr; }
  .steps { grid-template-columns: 1fr; }
  .demo-stats { grid-template-columns: repeat(2, 1fr); }
  .sliders { grid-template-columns: 1fr; }
  .footer-inner { flex-direction: column; gap: 24px; }
}

@media (prefers-reduced-motion: reduce) {
  * { animation-duration: 0.001ms !important; animation-iteration-count: 1 !important; scroll-behavior: auto; }
  html { scroll-behavior: auto; }
}