/* 星栈算力欢迎页 — 零依赖纯静态样式 */
:root {
  --bg: #070b14;
  --bg-soft: #0b1220;
  --panel: #101a2c;
  --panel-2: #0d1626;
  --line: #1e2a40;
  --line-soft: #172238;
  --text: #e9f0fb;
  --muted: #94a6c0;
  --dim: #64748b;
  --teal: #4fd1c5;
  --mint: #5eead4;
  --violet: #a78bfa;
  --amber: #fbbf24;
  --danger: #fb7185;
  --radius: 16px;
  --wrap: 1180px;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 88px; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
button { font: inherit; }
code, pre { font-family: var(--mono); }
::selection { background: rgba(79, 209, 197, .28); }

.starfield {
  position: fixed; inset: 0; z-index: -1; pointer-events: none;
  background:
    radial-gradient(ellipse 60% 45% at 18% 0%, rgba(79, 209, 197, .10), transparent 70%),
    radial-gradient(ellipse 55% 45% at 88% 12%, rgba(167, 139, 250, .10), transparent 70%),
    radial-gradient(circle at 50% 100%, rgba(30, 58, 95, .18), transparent 60%);
}
.starfield::after {
  content: ""; position: absolute; inset: 0; opacity: .28;
  background-image: radial-gradient(#7c93b8 1px, transparent 1px);
  background-size: 46px 46px;
  mask-image: linear-gradient(to bottom, #000 0%, transparent 62%);
}

.wrap { width: min(var(--wrap), calc(100% - 48px)); margin-inline: auto; }
.section { padding: 92px 0; }
.section-alt { background: linear-gradient(180deg, rgba(13, 22, 38, .55), rgba(9, 15, 27, .25)); border-block: 1px solid var(--line-soft); }

/* ── Header ─────────────────────────────────────────────── */
.site-header {
  position: sticky; top: 0; z-index: 30;
  background: rgba(7, 11, 20, .82);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--line-soft);
}
.header-inner { height: 68px; display: flex; align-items: center; gap: 28px; }
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 700; letter-spacing: .02em; white-space: nowrap; }
.brand-name em { font-style: normal; color: var(--muted); font-weight: 500; font-size: 13px; margin-left: 4px; }
.nav { display: flex; gap: 26px; margin-left: auto; font-size: 14px; color: var(--muted); }
.nav a { transition: color .2s; }
.nav a:hover, .nav a:focus-visible { color: var(--mint); }
.nav-ghost {
  font-size: 13px; padding: 7px 14px; border: 1px solid var(--line);
  border-radius: 9px; color: var(--muted); white-space: nowrap; transition: all .2s;
}
.nav-ghost:hover { border-color: var(--teal); color: var(--mint); background: rgba(79, 209, 197, .07); }

/* ── Hero ───────────────────────────────────────────────── */
.hero { display: grid; grid-template-columns: 1.15fr .85fr; gap: 64px; align-items: center; padding: 96px 0 104px; }
.eyebrow {
  display: inline-flex; align-items: center; gap: 9px; font-size: 12.5px; letter-spacing: .04em;
  color: var(--mint); background: rgba(79, 209, 197, .08);
  border: 1px solid rgba(79, 209, 197, .22); border-radius: 100px; padding: 6px 14px;
}
.dot { width: 7px; height: 7px; border-radius: 50%; background: var(--mint); box-shadow: 0 0 10px var(--mint); flex: none; }
h1 { font-size: clamp(38px, 4.6vw, 60px); line-height: 1.22; margin: 24px 0 20px; letter-spacing: -.02em; font-weight: 750; }
.grad { background: linear-gradient(100deg, var(--mint), #7dd3fc 45%, var(--violet)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.lede { color: var(--muted); font-size: 16.5px; max-width: 620px; margin: 0 0 32px; }
.lede strong { color: var(--text); font-weight: 600; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; }
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 12px 22px; border-radius: 11px; font-size: 14.5px; font-weight: 600;
  border: 1px solid transparent; cursor: pointer; transition: transform .18s, box-shadow .18s, background .18s, border-color .18s;
}
.btn:hover { transform: translateY(-2px); }
.btn-primary { background: linear-gradient(110deg, var(--teal), #6ea8fe); color: #05121a; box-shadow: 0 8px 26px rgba(79, 209, 197, .2); }
.btn-primary:hover { box-shadow: 0 12px 32px rgba(79, 209, 197, .32); }
.btn-secondary { background: rgba(255, 255, 255, .03); border-color: var(--line); color: var(--text); }
.btn-secondary:hover { border-color: #3b5480; background: rgba(255, 255, 255, .06); }
.btn-sm { padding: 9px 16px; font-size: 13.5px; }
.hero-facts { list-style: none; padding: 0; margin: 30px 0 0; display: flex; flex-wrap: wrap; gap: 8px 22px; font-size: 13px; color: var(--dim); }
.hero-facts li { display: flex; align-items: center; gap: 8px; }
.hero-facts li::before { content: ""; width: 5px; height: 5px; border-radius: 50%; background: var(--violet); }

.hero-panel {
  background: linear-gradient(160deg, rgba(20, 33, 54, .95), rgba(11, 18, 32, .95));
  border: 1px solid var(--line); border-radius: 20px; padding: 26px;
  box-shadow: 0 24px 70px rgba(0, 0, 0, .38), inset 0 1px 0 rgba(255, 255, 255, .04);
}
.panel-head { display: flex; justify-content: space-between; align-items: center; gap: 12px; font-size: 12px; color: var(--muted); }
.panel-tag { font-family: var(--mono); font-size: 11px; color: var(--dim); border: 1px solid var(--line); border-radius: 6px; padding: 2px 7px; white-space: nowrap; }
.speed { display: flex; align-items: flex-end; gap: 16px; padding: 22px 0 24px; border-bottom: 1px solid var(--line-soft); }
.speed-num { font-size: 68px; font-weight: 750; line-height: 1; letter-spacing: -.05em; background: linear-gradient(120deg, var(--mint), var(--violet)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.speed-num span { font-size: 34px; }
.speed-label { font-size: 14px; font-weight: 600; padding-bottom: 8px; }
.speed-label small { display: block; font-weight: 400; color: var(--dim); font-size: 11.5px; white-space: nowrap; }
.panel-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; padding: 22px 0; }
.panel-grid div { display: flex; flex-direction: column; gap: 2px; }
.panel-grid b { font-size: 20px; font-weight: 650; font-family: var(--mono); color: var(--text); }
.panel-grid span { font-size: 11.5px; color: var(--dim); }
.panel-note { font-size: 12px; line-height: 1.75; color: var(--dim); margin: 0; padding-top: 16px; border-top: 1px solid var(--line-soft); }
.panel-note em { color: var(--amber); font-style: normal; }

/* ── Section head ───────────────────────────────────────── */
.section-head { display: flex; justify-content: space-between; align-items: flex-end; gap: 32px; margin-bottom: 38px; }
.kicker { font-family: var(--mono); font-size: 11.5px; letter-spacing: .14em; color: var(--teal); margin-bottom: 12px; }
h2 { font-size: clamp(26px, 3vw, 36px); line-height: 1.3; margin: 0 0 12px; letter-spacing: -.015em; font-weight: 700; }
.section-head p { margin: 0; color: var(--muted); font-size: 15px; max-width: 680px; }

/* ── Demo ───────────────────────────────────────────────── */
.demo-controls { display: flex; align-items: center; gap: 14px; flex: none; }
.switch { display: inline-flex; align-items: center; gap: 8px; font-size: 13px; color: var(--muted); cursor: pointer; white-space: nowrap; }
.switch input { appearance: none; width: 34px; height: 19px; border-radius: 20px; background: #22304a; border: 1px solid #2e405f; position: relative; cursor: pointer; transition: background .2s; }
.switch input::after { content: ""; position: absolute; top: 2px; left: 2px; width: 13px; height: 13px; border-radius: 50%; background: #8ba0bd; transition: transform .2s, background .2s; }
.switch input:checked { background: rgba(251, 113, 133, .28); border-color: var(--danger); }
.switch input:checked::after { transform: translateX(15px); background: var(--danger); }

.demo-board {
  background: linear-gradient(160deg, #0c1526, #09111f);
  border: 1px solid var(--line); border-radius: 20px; overflow: hidden;
  box-shadow: 0 22px 60px rgba(0, 0, 0, .3);
}
.demo-stage { padding: 18px 18px 4px; }
#flow { display: block; width: 100%; height: auto; }

/* SVG 基础 */
.stage-labels text { font-family: var(--mono); letter-spacing: .08em; }
.node-card > rect:first-of-type { fill: #101a2c; stroke: #22304a; stroke-width: 1.4; transition: stroke .35s, fill .35s; }
.node-card .card-title { fill: #e9f0fb; font-size: 13.5px; font-weight: 650; }
.node-card .card-sub { fill: #7e93b2; font-size: 10.5px; }
.node-card .card-meta { fill: #64748b; font-size: 10px; font-family: var(--mono); }
.node-card .film { fill: #0a1526; stroke: #22384f; }
.card-title, .card-sub, .card-meta { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", sans-serif; }

.seg > rect { fill: #14243b; stroke: #2a3d5c; stroke-width: 1; transition: fill .35s, stroke .35s, opacity .35s; }
.seg text { fill: #8ba2c2; font-size: 10px; font-family: var(--mono); transition: fill .35s; }
.seg { opacity: .35; transition: opacity .35s; }
.seg.is-on { opacity: 1; }
.seg.is-dispatched > rect { fill: rgba(79, 209, 197, .14); stroke: var(--teal); }
.seg.is-failed > rect { fill: rgba(251, 113, 133, .16); stroke: var(--danger); }
.seg.is-done > rect { fill: rgba(94, 234, 212, .2); stroke: var(--mint); }
.seg.is-done text { fill: #d3f7ee; }

.status-dot { fill: #2f4566; transition: fill .3s; }
.worker.is-on .status-dot { fill: var(--mint); filter: url(#glow); }
.worker.is-offline > rect:first-of-type { stroke: var(--danger); fill: #261a28; }
.worker.is-offline .status-dot { fill: var(--danger); }
.worker.is-offline .card-title { fill: var(--danger); }
.worker.is-offline .bar-fill { fill: var(--danger); }
.worker.is-busy > rect:first-of-type { stroke: rgba(79, 209, 197, .65); }
.bar-bg { fill: #1b2a42; }
.bar-fill { fill: url(#gBar); transform: scaleX(0); transform-box: fill-box; transform-origin: left center; transition: transform .5s ease; }
.node-count { fill: #64748b; font-size: 10px; font-family: var(--mono); }

.verify-row { fill: #64748b; font-size: 10px; font-family: var(--mono); transition: fill .3s; }
.verify-row.is-ok { fill: var(--mint); }
.verify-total { fill: #8ba2c2; font-size: 10.5px; font-family: var(--mono); font-weight: 600; }
.merge-bg { fill: #1b2a42; }
.merge-fill { fill: url(#gBar); transform: scaleX(0); transform-box: fill-box; transform-origin: left center; transition: transform .8s ease; }
#settle { fill: #64748b; }
#settle.is-on { fill: var(--amber); }
.phase-caption { fill: #8ba2c2; font-size: 12.5px; font-family: var(--mono); letter-spacing: .02em; }

.flow-lines-active path { stroke-dasharray: 1000; stroke-dashoffset: 1000; opacity: 0; transition: stroke-dashoffset .9s ease, opacity .3s; }
.flow-lines-active path.is-on { stroke-dashoffset: 0; opacity: 1; }
#flying > g { transition: transform .75s cubic-bezier(.4, 0, .2, 1), opacity .4s; }
#flying rect { fill: rgba(94, 234, 212, .16); stroke: var(--mint); stroke-width: 1.2; }
#flying text { fill: #d5f8ef; font-size: 9.5px; font-family: var(--mono); }

.demo-log { border-top: 1px solid var(--line-soft); background: #080f1c; padding: 14px 22px 18px; min-height: 132px; }
.log-head { display: flex; justify-content: space-between; font-family: var(--mono); font-size: 11px; color: var(--dim); letter-spacing: .06em; border-bottom: 1px dashed var(--line-soft); padding-bottom: 8px; margin-bottom: 10px; }
#log-phase { color: var(--teal); }
#log-lines { list-style: none; margin: 0; padding: 0; font-family: var(--mono); font-size: 11.5px; line-height: 1.85; color: #9fb4d0; max-height: 116px; overflow-y: auto; }
#log-lines li { white-space: pre-wrap; word-break: break-word; }
#log-lines li::before { content: "› "; color: var(--teal); }
#log-lines li.log-muted { color: var(--dim); }
#log-lines li.log-warn { color: var(--amber); }
#log-lines li.log-ok { color: var(--mint); }
#log-lines li.log-err { color: var(--danger); }
.demo-footnote { font-size: 12.5px; color: var(--dim); margin: 16px 0 0; }
.demo-footnote code { color: var(--muted); background: rgba(255, 255, 255, .04); padding: 1px 5px; border-radius: 4px; font-size: 11.5px; }

/* ── Features ───────────────────────────────────────────── */
.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.feature {
  background: linear-gradient(165deg, rgba(19, 31, 51, .8), rgba(12, 20, 35, .8));
  border: 1px solid var(--line-soft); border-radius: var(--radius); padding: 24px;
  transition: transform .22s, border-color .22s, box-shadow .22s;
}
.feature:hover { transform: translateY(-4px); border-color: rgba(79, 209, 197, .4); box-shadow: 0 16px 36px rgba(0, 0, 0, .28); }
.feature-icon { width: 38px; height: 38px; color: var(--mint); background: rgba(79, 209, 197, .09); border: 1px solid rgba(79, 209, 197, .2); border-radius: 10px; display: grid; place-items: center; margin-bottom: 16px; }
.feature-icon svg { width: 21px; height: 21px; }
.feature h3 { font-size: 17px; margin: 0 0 9px; font-weight: 650; }
.feature p { font-size: 13.5px; color: var(--muted); margin: 0; line-height: 1.8; }
.feature code { font-size: 11.5px; color: var(--mint); background: rgba(79, 209, 197, .07); padding: 1px 4px; border-radius: 4px; }

/* ── How ────────────────────────────────────────────────── */
.how-grid { display: grid; grid-template-columns: 1.35fr .65fr; gap: 28px; align-items: start; }
.how-step { display: flex; gap: 20px; padding: 20px 0; border-bottom: 1px solid var(--line-soft); }
.how-step:first-child { padding-top: 0; }
.how-step > span { font-family: var(--mono); font-size: 13px; color: var(--teal); opacity: .8; padding-top: 3px; flex: none; }
.how-step h3 { font-size: 16px; margin: 0 0 7px; font-weight: 650; }
.how-step p { font-size: 13.5px; color: var(--muted); margin: 0; line-height: 1.85; }
.how-step code { font-size: 11.5px; color: var(--mint); background: rgba(79, 209, 197, .07); padding: 2px 5px; border-radius: 4px; word-break: break-word; }
.how-side { background: linear-gradient(160deg, rgba(19, 31, 51, .9), rgba(11, 19, 33, .9)); border: 1px solid var(--line); border-radius: var(--radius); padding: 26px; position: sticky; top: 92px; }
.how-side h3 { font-size: 15px; margin: 0 0 18px; }
.how-side dl { margin: 0 0 20px; }
.how-side dl div { padding: 11px 0; border-top: 1px solid var(--line-soft); }
.how-side dt { font-size: 12px; color: var(--teal); font-weight: 600; margin-bottom: 3px; }
.how-side dd { font-size: 12.5px; color: var(--muted); margin: 0; line-height: 1.7; }
.how-side code { font-size: 11px; }
.text-link { font-size: 13px; color: var(--mint); border-bottom: 1px solid rgba(94, 234, 212, .35); padding-bottom: 2px; }
.text-link:hover { border-color: var(--mint); }

/* ── Downloads ──────────────────────────────────────────── */
.release-badge { display: inline-flex; align-items: center; gap: 9px; font-size: 12.5px; color: var(--muted); background: rgba(255, 255, 255, .03); border: 1px solid var(--line); border-radius: 100px; padding: 7px 14px; white-space: nowrap; flex: none; }
.release-badge.is-ready { color: var(--mint); border-color: rgba(79, 209, 197, .3); }
.release-badge.is-empty { color: var(--amber); border-color: rgba(251, 191, 36, .3); }
.download-notice { display: flex; flex-wrap: wrap; align-items: center; gap: 10px 16px; background: rgba(251, 191, 36, .06); border: 1px solid rgba(251, 191, 36, .25); border-radius: 12px; padding: 16px 20px; margin-bottom: 26px; font-size: 13.5px; color: var(--muted); }
/* 作者样式的 display:flex 会盖掉 UA 的 [hidden]{display:none}，必须显式恢复，
   否则「还没有正式 Release」在限流或已发布时也会一直挂着。 */
.download-notice[hidden] { display: none; }
.download-notice strong { color: var(--amber); }
.download-notice code { color: var(--amber); }
.download-notice a { margin-left: auto; color: var(--mint); white-space: nowrap; font-size: 13px; }
.download-notice a:hover { text-decoration: underline; }
.download-tabs { display: flex; gap: 8px; margin-bottom: 20px; flex-wrap: wrap; }
.tab { background: transparent; border: 1px solid var(--line); color: var(--muted); border-radius: 9px; padding: 7px 16px; font-size: 13px; cursor: pointer; transition: all .2s; }
.tab:hover { border-color: #3b5480; color: var(--text); }
.tab.is-active { background: rgba(79, 209, 197, .12); border-color: rgba(79, 209, 197, .45); color: var(--mint); }
.download-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }
.dl-card { background: linear-gradient(165deg, rgba(19, 31, 51, .85), rgba(12, 20, 35, .85)); border: 1px solid var(--line); border-radius: 14px; padding: 18px; display: flex; flex-direction: column; gap: 10px; transition: border-color .2s, transform .2s; }
.dl-card:hover { border-color: rgba(79, 209, 197, .4); transform: translateY(-3px); }
.dl-card.is-server { border-color: rgba(167, 139, 250, .38); }
.dl-card.is-hidden { display: none; }
.dl-top { display: flex; align-items: center; gap: 10px; }
.dl-os { width: 32px; height: 32px; flex: none; display: grid; place-items: center; border-radius: 8px; background: rgba(255, 255, 255, .05); color: var(--mint); }
.dl-os svg { width: 19px; height: 19px; }
.dl-name { font-size: 14px; font-weight: 650; }
.dl-arch { font-size: 11px; color: var(--dim); font-family: var(--mono); }
.dl-file { font-family: var(--mono); font-size: 10.5px; color: var(--dim); word-break: break-all; line-height: 1.55; min-height: 32px; }
.dl-meta { font-size: 11.5px; color: var(--muted); display: flex; justify-content: space-between; gap: 8px; }
.dl-btn { margin-top: auto; display: inline-flex; align-items: center; justify-content: center; gap: 6px; padding: 9px 12px; border-radius: 9px; background: rgba(79, 209, 197, .1); border: 1px solid rgba(79, 209, 197, .28); color: var(--mint); font-size: 12.5px; font-weight: 600; transition: background .2s; }
.dl-btn:hover { background: rgba(79, 209, 197, .2); }
.dl-card.is-server .dl-btn { background: rgba(167, 139, 250, .1); border-color: rgba(167, 139, 250, .3); color: #c4b5fd; }
.dl-btn.is-disabled { opacity: .55; pointer-events: none; }
.dl-card.is-client { border-color: rgba(94, 234, 212, .34); background: linear-gradient(165deg, rgba(20, 43, 52, .9), rgba(11, 22, 36, .9)); }
.dl-card.is-client .dl-os { background: rgba(79, 209, 197, .14); color: var(--mint); }
.dl-card.is-client .dl-desc { font-size: 12.5px; color: var(--muted); line-height: 1.6; }
.dl-desc span { display: block; font-size: 11px; color: var(--amber); margin-top: 2px; }
.download-legend { margin-top: 30px; padding: 22px 24px; border: 1px solid var(--line); border-radius: 14px; background: rgba(13, 22, 38, .6); }
.download-legend h3 { font-size: 14px; margin: 0 0 16px; color: var(--text); }
.legend-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px 30px; }
.legend-grid > div { display: flex; flex-direction: column; gap: 4px; font-size: 12.5px; color: var(--muted); line-height: 1.7; }
.legend-grid b { color: var(--mint); font-weight: 650; font-size: 13px; }
.legend-grid b b { color: var(--amber); }
.legend-grid code { font-size: 11.5px; color: #b6c9e4; }
.download-foot { display: grid; grid-template-columns: 1fr 1fr; gap: 32px; margin-top: 42px; padding-top: 32px; border-top: 1px solid var(--line-soft); }
.download-foot h3 { font-size: 15px; margin: 0 0 10px; }
.download-foot p { font-size: 13px; color: var(--muted); margin: 0 0 12px; }
.download-foot code { color: var(--mint); font-size: 12px; }
.download-foot pre { background: #080f1c; border: 1px solid var(--line-soft); border-radius: 10px; padding: 14px 16px; overflow-x: auto; margin: 0 0 12px; }
.download-foot pre code { font-size: 11.5px; color: #b6c9e4; }
.hint { font-size: 12px; color: var(--dim) !important; }
.client-list { list-style: none; padding: 0; margin: 0 0 12px; }
.client-list li { font-size: 12.5px; color: var(--muted); padding: 7px 0; border-bottom: 1px dashed var(--line-soft); }
.client-list b { color: var(--text); font-weight: 600; margin-right: 8px; }

/* ── Quickstart ─────────────────────────────────────────── */
.quickstart { display: grid; grid-template-columns: .85fr 1.15fr; gap: 56px; align-items: center; }
.quickstart p { color: var(--muted); font-size: 15px; margin: 0 0 26px; }
.code-block { background: #080f1c; border: 1px solid var(--line); border-radius: 14px; padding: 22px 24px; margin: 0; overflow-x: auto; font-size: 12.5px; line-height: 2; color: #b6c9e4; box-shadow: 0 18px 44px rgba(0, 0, 0, .28); }
.c-comment { color: #5c7799; }

/* ── Footer ─────────────────────────────────────────────── */
.site-footer { border-top: 1px solid var(--line-soft); padding: 34px 0 44px; background: rgba(7, 11, 20, .6); }
.footer-inner { display: flex; flex-wrap: wrap; align-items: center; gap: 16px 28px; }
.footer-brand { display: inline-flex; align-items: center; gap: 9px; font-weight: 650; font-size: 14px; }
.footer-inner nav { display: flex; flex-wrap: wrap; gap: 20px; font-size: 13px; color: var(--muted); margin-left: auto; }
.footer-inner nav a:hover { color: var(--mint); }
.footer-inner nav small { color: var(--dim); font-size: 11px; }
.footer-note { flex-basis: 100%; font-size: 11.5px; color: var(--dim); margin: 6px 0 0; }

/* ── Responsive ─────────────────────────────────────────── */
/* 网格列一律写成 minmax(0, 1fr)：默认的 1fr 最小宽度是 auto，
   会被内部不换行的短文本撑破，导致窄屏整栏按更宽的列排版、右侧被裁切。 */
.hero > *, .how-grid > *, .quickstart > *, .section-head > div { min-width: 0; }

@media (max-width: 1000px) {
  .hero { grid-template-columns: minmax(0, 1fr); gap: 40px; padding: 64px 0 76px; }
  .hero-panel { max-width: 560px; }
  .feature-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .how-grid { grid-template-columns: minmax(0, 1fr); }
  .how-side { position: static; }
  .download-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .quickstart { grid-template-columns: minmax(0, 1fr); gap: 32px; }
  .nav { display: none; }
}
@media (max-width: 640px) {
  .wrap { width: min(var(--wrap), calc(100% - 32px)); }
  .section { padding: 64px 0; }
  .section-head { flex-direction: column; align-items: flex-start; gap: 18px; }
  .demo-controls { flex-wrap: wrap; }
  .feature-grid, .download-grid, .download-foot, .panel-grid, .legend-grid { grid-template-columns: minmax(0, 1fr); }
  .speed { flex-wrap: wrap; gap: 8px 16px; }
  .speed-num { font-size: 54px; }
  .speed-label small, .panel-tag, .release-badge, .download-notice a { white-space: normal; }
  .panel-head { flex-wrap: wrap; }
  .release-badge { max-width: 100%; }
  .hero-facts { flex-direction: column; align-items: flex-start; gap: 6px; }
  .demo-stage { padding: 8px 6px 0; }
  .demo-log { padding: 12px 14px 16px; }
  .download-notice a { margin-left: 0; }
  .footer-inner nav { margin-left: 0; }
  h1 { font-size: 36px; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .01ms !important; transition-duration: .01ms !important; scroll-behavior: auto !important; }
}