/* 首屏：排版与装置独立，辉光的光核贴住窗口上沿。 */
.hero {
  position: relative;
  overflow: hidden;
  padding-bottom: 104px;
  background: linear-gradient(180deg, var(--bg) 0, var(--bg) 620px, var(--bg-panel) calc(100% - 140px));
  color: var(--text);
}
.hero-intro { position: relative; z-index: 4; max-width: 880px; margin-inline: auto; padding: 40px 24px 0; display: flex; flex-direction: column; align-items: center; text-align: center; }
.badge { display: inline-flex; align-items: center; justify-content: center; gap: 9px; max-width: 100%; min-height: 28px; padding: 4px 14px 4px 11px; border-radius: var(--r-pill); border: 1px solid rgb(var(--text-rgb) / .12); background: rgb(var(--panel2-rgb) / .55); color: var(--text-muted); font-size: 12.5px; line-height: 1.5; overflow-wrap: anywhere; }
.badge-dot { width: 7px; height: 7px; border-radius: var(--r-pill); background: var(--glow-core); color: var(--text); box-shadow: 0 0 0 3px rgb(var(--glow-b-rgb) / .22), 0 0 10px rgb(var(--glow-core-rgb) / .85); }
.hero-title { margin: 22px 0 0; font-size: clamp(30px, 3.4vw, 48px); line-height: 1.16; font-weight: var(--weight-normal); letter-spacing: -.02em; }
.hero-title .line { display: block; }
.hero-title .line-2 { color: rgb(var(--text-rgb) / .8); }
.cta-row { display: flex; flex-wrap: wrap; justify-content: center; gap: 12px; margin-top: 26px; }
.lead { max-width: 600px; margin: 22px auto 0; font-size: 15.5px; line-height: 1.75; color: var(--text-muted); }
.lead strong { font-weight: var(--weight-medium); color: var(--text); }
.chips { display: flex; flex-wrap: wrap; justify-content: center; gap: 8px; padding: 0; margin: 18px 0 0; list-style: none; }
.chips li, .tag { display: inline-flex; align-items: center; justify-content: center; max-width: 100%; min-height: 26px; padding: 3px 12px; border: 1px solid rgb(var(--text-rgb) / .12); border-radius: var(--r-pill); background: rgb(var(--panel2-rgb) / .5); color: var(--text-muted); font-size: 12.5px; overflow-wrap: anywhere; }
.platforms { margin-top: 18px; }
.platform-list { display: flex; flex-wrap: wrap; justify-content: center; gap: 6px 26px; margin: 0; padding: 0; list-style: none; }
.platform-link { display: inline-flex; align-items: center; gap: 7px; min-height: 22px; color: var(--text-muted); font-size: 13.5px; text-decoration: none; }
.platform-link:hover { color: var(--text); }
.platform-link svg { width: 15px; height: 15px; }
.stage { position: relative; width: min(1180px, 92vw); margin: 80px auto 0; }
.glow-field {
  position: absolute; left: 50%; top: -420px; z-index: 0; width: 1700px; height: 1320px; transform: translateX(-50%); pointer-events: none;
  background:
    radial-gradient(130px 34px at 50% 420px, rgb(var(--glow-core-rgb) / .95), rgb(var(--glow-core-rgb) / 0) 100%),
    radial-gradient(300px 120px at 50% 426px, rgb(var(--glow-core-rgb) / .45), rgb(var(--glow-core-rgb) / 0) 100%),
    radial-gradient(520px 230px at 50% 450px, rgb(var(--glow-b-rgb) / .62), rgb(var(--glow-b-rgb) / 0) 100%),
    radial-gradient(820px 380px at 50% 500px, rgb(var(--glow-b-rgb) / .28), rgb(var(--glow-b-rgb) / 0) 100%),
    radial-gradient(980px 460px at 50% 560px, rgb(var(--glow-a-rgb) / .5), rgb(var(--glow-a-rgb) / 0) 100%),
    radial-gradient(860px 760px at 50% 900px, rgb(var(--glow-a-rgb) / .3), rgb(var(--glow-a-rgb) / 0) 100%);
  color: var(--text);
}
.orbit { position: absolute; left: 50%; top: 0; z-index: 1; border-radius: var(--r-pill); transform: translate(-50%, -50%); pointer-events: none; }
.orbit-inner { width: 540px; height: 110px; border: 1px solid rgb(var(--glow-core-rgb) / .26); }
.orbit-outer { width: 880px; height: 150px; border: 1px solid rgb(var(--glow-b-rgb) / .2); }
.orbit::after { content: ""; position: absolute; width: 5px; height: 5px; border-radius: var(--r-pill); background: var(--glow-core); color: var(--text); box-shadow: 0 0 8px 1px rgb(var(--glow-core-rgb) / .8); transform: translate(-50%, -50%); }
.orbit-inner::after { left: 18%; top: 11.6%; }
.orbit-outer::after { left: 90%; top: 20%; }
.stars {
  position: absolute; left: 50%; top: 0; z-index: 1; width: 2px; height: 2px; border-radius: var(--r-pill); background: rgb(var(--text-rgb) / .85); color: var(--text); pointer-events: none;
  box-shadow: -430px -38px 0 0 rgb(var(--text-rgb) / .7), -352px -70px 0 .5px rgb(var(--glow-core-rgb) / .8), -258px -18px 0 0 rgb(var(--text-rgb) / .55), -176px -62px 0 0 rgb(var(--text-rgb) / .8), -92px -74px 0 0 rgb(var(--glow-core-rgb) / .6), 96px -68px 0 .5px rgb(var(--text-rgb) / .75), 190px -26px 0 0 rgb(var(--text-rgb) / .6), 286px -72px 0 0 rgb(var(--glow-core-rgb) / .7), 384px -48px 0 .5px rgb(var(--text-rgb) / .7), 470px -16px 0 0 rgb(var(--text-rgb) / .5), -644px 70px 0 0 rgb(var(--text-rgb) / .6), 652px 124px 0 .5px rgb(var(--glow-core-rgb) / .7), -676px 236px 0 0 rgb(var(--text-rgb) / .5), 630px 318px 0 0 rgb(var(--text-rgb) / .55), -622px 404px 0 .5px rgb(var(--glow-core-rgb) / .5);
}
.cat { position: absolute; left: 50%; bottom: 100%; z-index: 3; width: 58px; height: 58px; margin-bottom: -4px; transform: translateX(-50%); filter: brightness(0) invert(1) drop-shadow(0 0 6px rgb(var(--text-rgb) / .9)) drop-shadow(0 0 22px rgb(var(--glow-core-rgb) / .75)); }
.cat img { display: block; width: 100%; height: 100%; }
.frame {
  position: relative; z-index: 2; padding: 10px; border-radius: var(--r-frame); border: 1px solid rgb(var(--glow-core-rgb) / .38);
  background: linear-gradient(180deg, rgb(var(--glow-b-rgb) / .34) 0, rgb(var(--glow-a-rgb) / .2) 42%, rgb(var(--glow-a-rgb) / .1) 100%); color: var(--text);
  box-shadow: inset 0 0 0 1px rgb(var(--glow-b-rgb) / .16), inset 0 1px 30px rgb(var(--glow-core-rgb) / .2), 0 30px 70px -24px rgb(var(--shadow-rgb) / .9), 0 0 140px -24px rgb(var(--glow-a-rgb) / .5);
}
.frame::before { content: ""; position: absolute; top: -1px; left: 16%; right: 16%; height: 1px; background: linear-gradient(90deg, rgb(var(--glow-core-rgb) / 0), var(--glow-core) 50%, rgb(var(--glow-core-rgb) / 0)); color: var(--text); }
.window { overflow: hidden; border-radius: var(--r-window); border: 1px solid var(--border); background: var(--ink-window); color: var(--text); box-shadow: inset 0 1px 0 rgb(var(--text-rgb) / .05); }
.titlebar { display: grid; grid-template-columns: 140px 1fr 140px; align-items: center; height: 40px; padding-inline: 16px; background: var(--ink-chrome); color: var(--text-muted); border-bottom: 1px solid rgb(var(--border-rgb) / .7); }
.lights { display: flex; gap: 8px; }
.light { width: 11px; height: 11px; border-radius: var(--r-pill); opacity: .85; }
.light-r { background: var(--error); color: var(--bg-panel); }
.light-y { background: var(--warn); color: var(--bg-panel); }
.light-g { background: var(--success); color: var(--bg-panel); }
.win-title { text-align: center; font-family: var(--font-mono); font-size: 12.5px; letter-spacing: .01em; }
.win-tools { display: flex; justify-content: flex-end; gap: 14px; }
.win-tools svg { width: 14px; height: 14px; }
.tabs { display: flex; min-height: 36px; background: var(--ink-chrome); color: var(--text-muted); border-bottom: 1px solid rgb(var(--border-rgb) / .7); }
.tab { position: relative; display: flex; align-items: center; gap: 8px; padding: 8px 16px; border-right: 1px solid rgb(var(--border-rgb) / .6); font-family: var(--font-mono); font-size: 12.5px; }
.tab.is-active { background: var(--ink-window); color: var(--text); }
.tab.is-active::after { content: ""; position: absolute; left: 12px; right: 12px; bottom: 0; height: 2px; border-radius: var(--r-pill); background: var(--accent); color: var(--bg-panel); }
.win-body { display: grid; grid-template-columns: 52px minmax(0, 1fr) 248px; }
.win-body > * { min-width: 0; }
.rail { display: flex; flex-direction: column; align-items: center; gap: 20px; padding-top: 16px; background: var(--ink-rail); color: var(--text-muted); border-right: 1px solid rgb(var(--border-rgb) / .6); }
.rail svg { width: 20px; height: 20px; }
.rail .is-active { color: var(--text); }
.code { padding: 12px 0 22px; overflow-x: auto; font-family: var(--font-mono); font-size: 13.5px; line-height: 23px; color: var(--text); }
.ln { display: grid; grid-template-columns: 58px max-content; min-width: 100%; animation: line-in .42s var(--ease-out) both; }
.ln .n { padding-right: 22px; text-align: right; color: var(--line-number); user-select: none; }
.ln .c { white-space: pre; padding-right: 20px; }
.ln.is-current { background: rgb(var(--glow-b-rgb) / .07); color: var(--text); }
.ln.is-current .n { color: var(--text); }
.code .k, pre .k { color: var(--syn-key); }
.code .s, pre .s { color: var(--syn-str); }
.code .num, pre .num { color: var(--syn-num); }
.code .com, pre .com { color: var(--syn-com); }
.code .p, pre .p { color: var(--syn-punc); }
.caret { display: inline-block; width: .62em; height: 1.15em; margin-left: 3px; vertical-align: -.22em; border-radius: var(--r-tiny); background: var(--glow-core); color: var(--ink-window); box-shadow: 0 0 10px rgb(var(--glow-core-rgb) / .7); animation: caret-blink 1.1s linear infinite; }
.ln:nth-child(2) { animation-delay: .042s; }
.ln:nth-child(3) { animation-delay: .084s; }
.ln:nth-child(4) { animation-delay: .126s; }
.ln:nth-child(5) { animation-delay: .168s; }
.ln:nth-child(6) { animation-delay: .21s; }
.ln:nth-child(7) { animation-delay: .252s; }
.ln:nth-child(8) { animation-delay: .294s; }
.ln:nth-child(9) { animation-delay: .336s; }
.ln:nth-child(10) { animation-delay: .378s; }
.ln:nth-child(11) { animation-delay: .42s; }
.ln:nth-child(12) { animation-delay: .462s; }
.ln:nth-child(13) { animation-delay: .504s; }
.ln:nth-child(14) { animation-delay: .546s; }
.ln:nth-child(15) { animation-delay: .588s; }
.ln:nth-child(16) { animation-delay: .63s; }
.ln:nth-child(17) { animation-delay: .672s; }
.ln:nth-child(18) { animation-delay: .714s; }
.ln:nth-child(19) { animation-delay: .756s; }
.ln:nth-child(20) { animation-delay: .798s; }
.ln:nth-child(21) { animation-delay: .84s; }
.ln:nth-child(22) { animation-delay: .882s; }
.ln:nth-child(23) { animation-delay: .924s; }
.outline { padding: 14px 18px; border-left: 1px solid rgb(var(--border-rgb) / .6); background: rgb(var(--panel2-rgb) / .35); color: var(--text-muted); }
.outline-head { margin-bottom: 10px; font-size: 11px; letter-spacing: .1em; }
.outline-list { list-style: none; margin: 0; padding: 0; font-family: var(--font-mono); font-size: 12.5px; line-height: 26px; }
.outline-list li { display: flex; align-items: center; gap: 8px; padding-inline: 8px; border-radius: var(--r-xs); }
.outline-list .sub { padding-left: 24px; }
.outline-list .is-current { background: rgb(var(--text-rgb) / .05); color: var(--text); }
.ol-mark { width: 6px; height: 6px; border-radius: var(--r-tiny); border: 1px solid currentColor; }
.panel { border-top: 1px solid rgb(var(--border-rgb) / .7); background: var(--ink-rail); color: var(--text-muted); }
.panel-tabs { display: flex; gap: 22px; min-height: 34px; padding-inline: 20px; align-items: center; border-bottom: 1px solid rgb(var(--border-rgb) / .5); font-size: 11.5px; letter-spacing: .08em; }
.panel-tab.is-active { color: var(--text); text-decoration: underline; text-underline-offset: 12px; }
.log { padding: 12px 20px 20px; overflow-x: auto; font-family: var(--font-mono); font-size: 12.5px; line-height: 23px; }
.log-line { white-space: pre; }
.log .lv { color: var(--syn-key); }
.log .ms { color: rgb(var(--text-rgb) / .78); }

/* 胶囊分段控件。data-autoplay="true" 仅用于首页特性。 */
.tab-shell { min-width: 0; }
.tab-list, [role="tablist"].pill-tabs {
  display: flex; align-items: center; gap: 6px; width: fit-content; max-width: 100%; margin-inline: auto; padding: 6px;
  overflow-x: auto; border: 1px solid var(--border); border-radius: var(--r-pill); background: var(--bg-panel); color: var(--text);
}
.tab-list [role="tab"], .pill-tabs [role="tab"] {
  position: relative; display: inline-flex; align-items: center; justify-content: center; flex-shrink: 0; min-height: 44px; padding: 10px 22px;
  border: 1px solid var(--clear); border-radius: var(--r-pill); background: var(--clear); color: var(--text-muted); font-size: 14px; font-weight: var(--weight-medium);
}
.tab-list [role="tab"][aria-selected="true"], .pill-tabs [role="tab"][aria-selected="true"] { border-color: rgb(var(--text-rgb) / .2); background: var(--bg-panel-2); color: var(--text); }
[role="tab"][aria-selected="true"]::after { content: ""; position: absolute; left: 20px; right: 20px; bottom: 3px; height: 2px; border-radius: var(--r-pill); background: var(--accent); color: var(--bg-panel); transform-origin: left; }
[data-autoplay="true"]:not(.is-paused) [role="tab"][aria-selected="true"]::after { animation: tab-countdown 8s linear forwards; }
.tab-caption { max-width: 720px; margin: 28px auto 32px; color: var(--text-muted); text-align: center; }
[role="tabpanel"] { min-width: 0; scroll-margin-top: 24px; }
[role="tabpanel"]:not([hidden]) { animation: panel-in .28s var(--ease-out); }
.feature-field { position: relative; isolation: isolate; overflow-x: clip; padding: 24px 0 48px; }
.feature-field::before { content: ""; position: absolute; z-index: -1; inset: 0 20% 0 -25%; background: radial-gradient(ellipse at 30% 75%, rgb(var(--glow-a-rgb) / .25), var(--clear) 65%); color: var(--text); pointer-events: none; }
.feature-panel { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); align-items: center; gap: 40px; padding: 40px; border: 1px solid var(--border); border-radius: var(--r-card); background: var(--bg-panel-2); color: var(--text); box-shadow: var(--shadow-float); }
.feature-panel h3 { margin: 0 0 16px; }
.feature-panel p { color: var(--text-muted); }
.feature-panel pre { margin: 0; }

/* 长页目录应直接放在覆盖全部章节的内容父容器中。 */
.toc { position: sticky; top: 16px; z-index: 10; display: flex; flex-wrap: wrap; align-items: center; gap: 6px; max-width: 100%; overflow-x: visible; padding: 8px; border: 1px solid var(--border); border-radius: var(--r-menu); background: var(--bg-panel-2); color: var(--text); }
.toc a { display: inline-flex; align-items: center; justify-content: center; min-height: 44px; flex-shrink: 0; padding: 8px 16px; border-radius: var(--r-btn); color: var(--text-muted); text-decoration: none; font-size: 14px; }
.toc a:hover, .toc a[aria-current="location"] { background: var(--ink-window); color: var(--text); }
.toc.is-static { position: static; }
.faq-item { padding: 0 24px; border: 1px solid var(--border); border-radius: var(--r-menu); background: var(--bg-panel-2); color: var(--text); }
.faq-item + .faq-item { margin-top: 12px; }
.faq-item summary { display: flex; align-items: center; justify-content: space-between; gap: 16px; min-height: 64px; padding-block: 16px; list-style: none; cursor: pointer; font-size: 16px; }
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after { content: "+"; flex-shrink: 0; font-family: var(--font-mono); color: var(--text-muted); }
.faq-item[open] summary::after { content: "−"; }
.faq-answer { padding-bottom: 20px; color: var(--text-muted); }
.faq-answer p:last-child { margin-bottom: 0; }
.term-card { border-top: 2px solid rgb(var(--text-rgb) / .25); }
.term-en { display: block; margin-bottom: 12px; font-family: var(--font-mono); font-size: 12px; color: var(--text-muted); }
.term-card h3 { margin-bottom: 8px; }
.term-card p { color: var(--text-muted); }
.client-card { display: flex; flex-direction: column; gap: 20px; }
.client-head { display: flex; align-items: center; gap: 16px; flex-wrap: wrap; }
.client-head > div { min-width: 0; }
.client-icon { width: 56px; height: 56px; flex-shrink: 0; }
.client-head h3 { margin: 0 0 6px; }
.client-meta { display: flex; flex-wrap: wrap; gap: 12px; color: var(--text-muted); font-size: 13px; }
[data-version]:empty { display: none; }
.client-actions { display: flex; align-items: center; flex-wrap: wrap; gap: 12px; margin-top: auto; }
.badge-featured, .badge-recommended { border-color: rgb(var(--text-rgb) / .25); background: var(--ink-window); color: var(--text); }
.badge-archived { border-color: var(--warn); background: var(--ink-window); color: var(--warn); }
.badge-success { border-color: var(--success); background: var(--ink-window); color: var(--success); }
.badge-error { border-color: var(--error); background: var(--ink-window); color: var(--error); }
.post-card { display: flex; flex-direction: column; gap: 16px; transition: border-color var(--time-fast), transform var(--time-fast); }
.post-card:hover { transform: translateY(-3px); border-color: rgb(var(--text-rgb) / .3); }
.post-meta { display: flex; align-items: center; flex-wrap: wrap; gap: 12px; font-size: 12px; color: var(--text-muted); }
.post-card h3 { font-size: 20px; margin: 0; }
.post-card h3 a { text-decoration: none; }
.post-card p { color: var(--text-muted); font-size: 14px; }
.post-link { margin-top: auto; font-size: 14px; }
.callout { margin: 24px 0; padding: 20px 24px; border: 1px solid var(--border); border-left: 3px solid var(--text-muted); border-radius: var(--r-btn); background: var(--bg-panel-2); color: var(--text); }
.callout p:last-child { margin-bottom: 0; }
.callout-warn { border-left-color: var(--warn); }
.callout-success { border-left-color: var(--success); }
.callout-error { border-left-color: var(--error); }
.table-scroll { max-width: 100%; min-width: 0; overflow-x: auto; border: 1px solid var(--border); border-radius: var(--r-menu); }
.data-table { width: 100%; border-collapse: collapse; background: var(--ink-window); color: var(--text); font-size: 14px; text-align: left; }
.data-table th, .data-table td, .prose table th, .prose table td {
  min-width: 7em; padding: 14px 18px; border-bottom: 1px solid var(--border); vertical-align: top; overflow-wrap: normal; word-break: normal;
}
.data-table th, .prose table th { background: var(--bg-panel-2); color: var(--text); font-weight: var(--weight-medium); }
.data-table td { color: var(--text-muted); }
.data-table tr:last-child td { border-bottom: 0; }
.prose table { display: block; overflow-x: auto; -webkit-overflow-scrolling: touch; max-width: 100%; min-width: 0; border-collapse: collapse; }
.data-table code, .prose table code { overflow-wrap: anywhere; }
.article-download { display: flex; align-items: center; justify-content: space-between; gap: 24px; margin-block: 40px; }
.article-download h3 { margin: 0 0 8px; }
.article-download p { margin: 0; color: var(--text-muted); }
.article-download .btn { flex-shrink: 0; }
.dl-fab {
  position: fixed; right: 24px; bottom: max(24px, env(safe-area-inset-bottom)); z-index: 50; display: inline-flex; align-items: center; justify-content: center; gap: 10px; min-height: 44px; padding: 7px 18px 7px 8px;
  border-radius: var(--r-pill); border: 1px solid rgb(var(--text-rgb) / .14); background: rgb(var(--panel2-rgb) / .86); color: var(--text);
  -webkit-backdrop-filter: blur(12px); backdrop-filter: blur(12px); box-shadow: var(--shadow-float); font-size: 14px; text-decoration: none; transition: transform var(--time-fast), border-color var(--time-fast);
}
.dl-fab:hover { transform: translateY(-2px); border-color: rgb(var(--text-rgb) / .3); }
.dl-fab-ico { display: grid; place-items: center; width: 28px; height: 28px; flex-shrink: 0; border-radius: var(--r-pill); background: var(--accent); color: var(--bg-panel); }
.dl-fab-ico svg { width: 14px; height: 14px; }
.sprite { position: absolute; width: 0; height: 0; overflow: hidden; }
.swatch-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(170px, 1fr)); gap: 16px; }
.swatch { min-width: 0; overflow: hidden; border: 1px solid var(--border); border-radius: var(--r-btn); background: var(--bg-panel-2); color: var(--text); }
.swatch-color { display: block; height: 64px; border-bottom: 1px solid var(--border); }
.swatch code { display: block; padding: 12px; font-size: 12px; }
.sw-bg { background: var(--bg); color: var(--text); }
.sw-panel { background: var(--bg-panel); color: var(--text); }
.sw-panel2 { background: var(--bg-panel-2); color: var(--text); }
.sw-border { background: var(--border); color: var(--text); }
.sw-accent { background: var(--accent); color: var(--bg-panel); }
.sw-accent-dark { background: var(--accent-dark); color: var(--bg-panel); }
.sw-text { background: var(--text); color: var(--bg-panel); }
.sw-muted { background: var(--text-muted); color: var(--bg-panel); }
.sw-success { background: var(--success); color: var(--bg-panel); }
.sw-warn { background: var(--warn); color: var(--bg-panel); }
.sw-error { background: var(--error); color: var(--bg-panel); }
.sw-glow-a { background: var(--glow-a); color: var(--text); }
.sw-glow-b { background: var(--glow-b); color: var(--bg-panel); }
.sw-core { background: var(--glow-core); color: var(--bg-panel); }
.sw-window { background: var(--ink-window); color: var(--text); }
.sw-chrome { background: var(--ink-chrome); color: var(--text); }
.sw-rail { background: var(--ink-rail); color: var(--text); }
.sw-key { background: var(--syn-key); color: var(--bg-panel); }
.sw-str { background: var(--syn-str); color: var(--bg-panel); }
.sw-num { background: var(--syn-num); color: var(--bg-panel); }
.sw-com { background: var(--syn-com); color: var(--bg-panel); }
.sw-punc { background: var(--syn-punc); color: var(--bg-panel); }
.sw-number { background: var(--line-number); color: var(--text); }
@keyframes line-in { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }
@keyframes caret-blink { 0%,49% { opacity: 1; } 50%,100% { opacity: 0; } }
@keyframes panel-in { from { opacity: .2; transform: translateY(4px); } to { opacity: 1; transform: none; } }
@keyframes tab-countdown { from { transform: scaleX(1); } to { transform: scaleX(0); } }
@media (max-width: 1040px) {
  .win-body { grid-template-columns: 52px minmax(0, 1fr); }
  .outline { display: none; }
}
@media (max-width: 768px) {
  .hero-title { font-size: clamp(24px, 4.6vw, 30px); }
  .hero-intro { padding-top: 32px; }
  .feature-panel { grid-template-columns: 1fr; padding: 28px; gap: 24px; }
  .titlebar { grid-template-columns: 70px 1fr 70px; }
  .article-download { align-items: flex-start; flex-direction: column; }
}
@media (max-width: 640px) {
  .hero-intro { padding-inline: var(--gutter); }
  .hero-title .line-2 { font-size: 24px; margin-top: 6px; }
  .hero { padding-bottom: 64px; }
  .lead { font-size: 14px; }
  .stage { width: calc(100% - var(--gutter) * 2); margin-top: 76px; }
  .platform-list { gap: 10px 18px; }
  .platform-link { min-height: 28px; }
  .frame { padding: 6px; }
  .titlebar { grid-template-columns: 48px 1fr; padding-inline: 10px; }
  .lights { gap: 5px; }
  .light { width: 8px; height: 8px; }
  .win-title { font-size: 10px; }
  .win-tools { display: none; }
  .tabs { overflow-x: auto; }
  .tab { flex-shrink: 0; font-size: 10px; padding-inline: 10px; }
  .win-body { grid-template-columns: 32px minmax(0, 1fr); }
  .rail svg { width: 16px; height: 16px; }
  .code { font-size: 11px; line-height: 21px; }
  .ln { grid-template-columns: 34px max-content; }
  .ln .n { padding-right: 10px; }
  .panel-tabs { gap: 18px; font-size: 10px; padding-inline: 12px; }
  .log { padding-inline: 12px; font-size: 10px; }
  .tab-list, [role="tablist"].pill-tabs { border-radius: var(--r-menu); justify-content: center; flex-wrap: wrap; }
  .tab-list [role="tab"], .pill-tabs [role="tab"] { padding-inline: 14px; font-size: 13px; }
  .feature-panel { padding: 22px; }
  .faq-item { padding-inline: 18px; }
  .dl-fab { right: 16px; bottom: max(16px, env(safe-area-inset-bottom)); }
  .swatch-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (prefers-reduced-motion: reduce) {
  .ln, .caret, [role="tabpanel"], [role="tab"]::after { animation: none !important; }
  .caret { opacity: 1; }
}