/* 首页首屏：保留确认稿的画板尺寸、错位与留白。 */
.hero { position: relative; height: var(--hero-h); overflow: hidden; }
.hero > .frame { position: relative; height: 100%; }
.hero-copy { position: relative; z-index: 2; width: 540px; padding-top: 124px; }
.kicker { display: flex; align-items: center; gap: 12px; font-family: var(--f-mono); font-size: var(--fs-meta); line-height: 20px; letter-spacing: 0.02em; color: var(--c-muted); }
.kicker-dots { display: inline-flex; gap: 4px; }
.kicker-dots i { display: block; width: 8px; height: 8px; border-radius: var(--r-tick); }
.kd-violet, .cd-violet { background: var(--c-violet); }
.kd-mint, .cd-mint { background: var(--c-mint); }
.kd-ultra, .cd-ultra { background: var(--c-ultra); }
.cd-accent { background: var(--c-accent); }
.hero-title { margin-top: 28px; font-size: var(--fs-display); line-height: 1.06; }
.hero-title .ln { display: block; animation: title-rise 640ms var(--ease-entry) both; }
.hero-title .ln-2 { animation-delay: 120ms; }
.hero-title .ln-3 { animation-delay: 240ms; }
.hl { position: relative; display: inline-block; isolation: isolate; padding-inline: 0.06em; }
.hl::before { content: ""; position: absolute; left: -0.04em; right: -0.04em; top: 0.16em; bottom: 0.02em; z-index: -1; background: var(--c-lime); border-radius: var(--r-chip); transform-origin: left center; animation: title-sweep 400ms var(--ease-entry) 720ms both; }
@keyframes title-rise { from { opacity: 0; transform: translateY(0.5em); } to { opacity: 1; transform: none; } }
@keyframes title-sweep { from { transform: scaleX(0); } to { transform: scaleX(1); } }
.hero-desc { margin-top: 36px; max-width: 480px; font-size: var(--fs-desc); line-height: 1.72; color: var(--c-muted); }
.hero-desc strong { color: var(--c-ink); font-weight: var(--fw-medium); }
.chips { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 28px; }
.chip { display: inline-flex; align-items: center; gap: 8px; min-height: 32px; padding: 5px 11px; border: 1px solid var(--c-line); border-radius: var(--r-chip); font-size: var(--fs-small); color: var(--c-ink); max-width: 100%; overflow-wrap: anywhere; }
.chip:hover { border-color: var(--c-ink); }
.chip-dot { width: 7px; height: 7px; border-radius: var(--r-tick); }
.platforms { display: flex; flex-wrap: wrap; align-items: center; gap: 26px; margin-top: 40px; color: var(--c-muted); font-size: var(--fs-small); }
.plat { display: inline-flex; align-items: center; gap: 8px; }
.plat svg { width: 17px; height: 17px; }
.platforms-label { font-family: var(--f-mono); font-size: var(--fs-meta); }
.board { position: absolute; z-index: 1; left: 676px; top: 0; width: 840px; height: 100%; pointer-events: none; }
.slab { position: absolute; left: 0; top: -40px; width: 300px; height: 560px; background: var(--c-violet); color: var(--c-on-accent); border-radius: var(--r-stage); }
.code-card { position: absolute; left: 64px; top: 126px; width: 440px; height: 248px; border-radius: var(--r-card); background: var(--c-ink); color: var(--c-code-text); font-family: var(--f-mono); }
.code-head { display: flex; align-items: center; gap: 10px; height: 52px; padding-inline: 24px; border-bottom: 1px solid var(--c-code-line); font-size: var(--fs-meta); color: var(--c-code-key); }
.file-mark { width: 8px; height: 8px; border-radius: var(--r-tick); background: var(--c-lime); }
.code-body { margin: 0; padding: 16px 24px 0; font-family: var(--f-mono); font-size: var(--fs-small); line-height: 24px; white-space: pre; border-radius: 0; }
.code-body .no { display: inline-block; width: 22px; margin-right: 14px; text-align: right; color: var(--c-code-key); }
.code-body .p, .code-body .k { color: var(--c-code-key); }
.code-body .s { color: var(--c-mint); }
.code-body .hk { margin-inline: -3px; padding: 2px 3px; border-radius: var(--r-code); background: var(--c-lime); color: var(--c-ink); }
.win { position: absolute; left: 340px; top: 226px; width: 392px; border: 1px solid var(--c-line-strong); border-radius: var(--r-win); background: var(--c-bg); color: var(--c-ink); }
.win-bar { display: flex; align-items: center; gap: 7px; height: 40px; padding-inline: 16px; border-bottom: 1px solid var(--c-line); }
.win-dot { width: 10px; height: 10px; border-radius: var(--r-circle); background: var(--c-dot); }
.win-title { margin-left: 10px; font-size: var(--fs-small); }
.win-tabs { display: flex; gap: 20px; height: 38px; padding-inline: 18px; border-bottom: 1px solid var(--c-line); font-size: var(--fs-meta); color: var(--c-muted); }
.win-tab { position: relative; display: flex; align-items: center; white-space: nowrap; }
.win-tab.is-on { color: var(--c-ink); }
.win-tab.is-on::after { content: ""; position: absolute; left: 0; right: 0; bottom: -1px; height: 3px; background: var(--c-accent); border-radius: var(--r-indicator) var(--r-indicator) 0 0; }
.win-rows { position: relative; padding: 6px 18px 10px; }
.row { display: flex; align-items: center; justify-content: space-between; gap: 8px; height: 46px; font-size: var(--fs-small); }
.row + .row { border-top: 1px solid var(--c-line); }
.sel { display: inline-flex; align-items: center; gap: 8px; height: 30px; padding: 0 10px 0 12px; border: 1px solid var(--c-line-strong); border-radius: var(--r-ctl); font-size: var(--fs-meta); }
.sel svg { width: 10px; height: 10px; color: var(--c-muted); }
.toggle { display: block; position: relative; width: 40px; height: 24px; border-radius: var(--r-pill); background: var(--c-accent); }
.toggle::after { content: ""; position: absolute; top: 3px; left: 19px; width: 18px; height: 18px; border-radius: var(--r-circle); background: var(--c-bg); }
.sub-strip { position: absolute; left: 264px; top: 490px; width: 430px; height: 62px; display: flex; align-items: center; gap: 10px; padding-inline: 18px 14px; background: var(--c-panel-2); color: var(--c-ink); border-radius: var(--r-strip); }
.sub-label { font-size: var(--fs-meta); color: var(--c-muted); margin-right: 2px; }
.sub-btn { display: inline-flex; align-items: center; gap: 7px; height: 36px; padding-inline: 12px; border: 1px solid var(--c-line-strong); border-radius: var(--r-ctl); font-size: var(--fs-meta); background: var(--c-bg); color: var(--c-ink); white-space: nowrap; }
.sub-btn svg { width: 14px; height: 14px; color: var(--c-violet); }
.sub-btn.is-pressed { border-color: var(--c-ink); }
.route-card { position: absolute; left: 504px; top: 556px; width: 340px; padding: 18px 22px 20px; background: var(--c-panel); color: var(--c-ink); border: 1px solid var(--c-lime-line); border-radius: var(--r-card); transform: rotate(-3deg); transform-origin: left top; }
.route-head { display: flex; align-items: baseline; gap: 10px; }
.route-title { font-size: var(--fs-small); }
.route-path { font-family: var(--f-mono); font-size: var(--fs-meta); color: var(--c-muted); }
.rule { display: flex; align-items: center; gap: 10px; margin-top: 12px; font-family: var(--f-mono); font-size: var(--fs-small); }
.rule-key { width: 112px; }
.rule-to { padding: 2px 8px; border-radius: var(--r-small); background: var(--c-ink); color: var(--c-lime); font-size: var(--fs-meta); }
.cursor { position: absolute; z-index: 4; display: flex; align-items: flex-start; pointer-events: none; }
.cursor svg { width: 20px; height: 20px; }
.cursor-arrow { fill: currentColor; stroke: var(--c-bg); stroke-width: 1.4; stroke-linejoin: round; }
.cursor-tag { margin-top: 15px; margin-left: -4px; padding: 3px 9px; border-radius: var(--r-pill); font-family: var(--f-mono); font-size: var(--fs-meta); line-height: 16px; }
.cursor-mint { left: 152px; top: 198px; color: var(--c-mint); }
.cursor-mint .cursor-tag { background: var(--c-mint); color: var(--c-ink); }
.cursor-ultra { right: 64px; top: 112px; flex-direction: row-reverse; color: var(--c-ultra); }
.cursor-ultra svg { transform: scaleX(-1); }
.cursor-ultra .cursor-tag { margin-top: 6px; margin-left: 0; margin-right: -2px; background: var(--c-ultra); color: var(--c-on-accent); }
.dl-zone { margin-inline: 24px; padding-top: 64px; padding-bottom: 80px; background: var(--c-panel); color: var(--c-ink); border-radius: var(--r-stage); }
.eyebrow { display: flex; align-items: center; gap: 8px; font-family: var(--f-mono); font-size: var(--fs-meta); color: var(--c-muted); }
.eyebrow i { display: block; width: 8px; height: 8px; background: var(--c-accent); border-radius: var(--r-tick); }
.dl-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); margin-top: 40px; background: var(--c-bg); color: var(--c-ink); border-radius: var(--r-card); overflow: hidden; }
.dl-card { display: flex; flex-direction: column; gap: 14px; min-height: 248px; padding: 32px 28px 30px; }
.dl-card + .dl-card { border-left: 1px solid var(--c-line); }
.dl-ico { width: 28px; height: 28px; }
.dl-name { font-size: var(--fs-lede); font-weight: var(--fw-regular); }
.dl-desc { font-size: var(--fs-small); color: var(--c-muted); }
.dl-card .text-link { margin-top: auto; }

.tabset { min-width: 0; }
.tab-list { display: flex; flex-wrap: wrap; gap: 8px; border-bottom: 1px solid var(--c-line); margin-bottom: 32px; }
.tab-button { position: relative; min-height: 48px; padding: 12px 18px; border: 0; background: var(--c-bg); color: var(--c-muted); font-size: var(--fs-body); }
.tab-button[aria-selected="true"] { color: var(--c-ink); }
.tab-button[aria-selected="true"]::after { content: ""; position: absolute; bottom: -1px; left: 18px; right: 18px; height: 3px; background: var(--c-accent); border-radius: var(--r-indicator); }
.tab-panel { min-width: 0; }
.feature-rails { display: grid; grid-template-columns: minmax(180px, 0.7fr) minmax(0, 2fr); gap: 56px; }
.feature-rails .tab-list { flex-direction: column; align-self: start; border: 0; gap: 12px; }
.feature-rails .tab-button { display: flex; gap: 14px; align-items: center; text-align: left; width: 100%; padding: 18px 24px; }
.feature-rails .tab-button[aria-selected="true"]::after { left: 0; top: 12px; bottom: 12px; width: 3px; height: auto; right: auto; }
.feature-stage { border-radius: var(--r-stage); background: var(--c-panel); color: var(--c-ink); overflow: hidden; padding: 40px; }
.feature-stage:nth-of-type(even) { background: var(--c-panel-2); color: var(--c-ink); }
.feature-stage.is-purple { background: var(--c-panel-2); color: var(--c-ink); }
.feature-stage p { margin-block: 28px 24px; max-width: 620px; }
.mini-window { max-width: 480px; margin-top: -64px; margin-inline: auto; padding: 24px; border: 1px solid var(--c-line); border-radius: var(--r-win); background: var(--c-bg); color: var(--c-ink); }
.mini-window .row { height: auto; min-height: 48px; }
.toc { display: flex; flex-wrap: wrap; gap: 8px 24px; padding: 20px 24px; border-block: 1px solid var(--c-line); background: var(--c-bg); color: var(--c-ink); }
.toc a { display: inline-flex; align-items: center; min-height: 44px; color: var(--c-muted); }
.toc a:hover, .toc a[aria-current] { color: var(--c-accent-dark); }
.toc-sticky { position: sticky; top: 0; z-index: 5; }
.faq-item { border-bottom: 1px solid var(--c-line); }
.faq-item summary { display: flex; justify-content: space-between; align-items: baseline; gap: 24px; padding-block: 24px; cursor: pointer; list-style: none; font-size: var(--fs-desc); }
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after { content: "+"; flex-shrink: 0; color: var(--c-accent-dark); }
.faq-item[open] summary::after { content: "−"; }
.faq-answer { padding-bottom: 28px; max-width: 740px; color: var(--c-muted); }
.term-card { padding: 32px; border-top: 3px solid var(--c-violet); border-radius: var(--r-card); background: var(--c-panel-2); color: var(--c-ink); min-width: 0; }
.term-card dt { font-size: var(--fs-h3); font-weight: var(--fw-regular); }
.term-card dd { margin-top: 20px; }
.term-category { display: block; margin-top: 6px; font-size: var(--fs-small); color: var(--c-muted); }
.client-card { border: 1px solid var(--c-line); border-radius: var(--r-card); padding: 32px; background: var(--c-bg); color: var(--c-ink); min-width: 0; }
.client-head { display: flex; flex-wrap: wrap; align-items: center; gap: 12px; margin-bottom: 20px; }
.client-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 24px; }
.client-rev { font-family: var(--f-mono); color: var(--c-muted); font-size: var(--fs-small); }
.badge { display: inline-flex; align-items: center; gap: 6px; padding: 4px 9px; border-radius: var(--r-chip); background: var(--c-panel-2); color: var(--c-ink); font-size: var(--fs-meta); max-width: 100%; overflow-wrap: anywhere; }
.badge-first { background: var(--c-lime); color: var(--c-ink); }
.badge-recommended { background: var(--c-panel); color: var(--c-ink); }
.badge-retired { background: var(--c-line); color: var(--c-ink); }
.tag { display: inline-block; max-width: 100%; overflow: hidden; white-space: nowrap; text-overflow: ellipsis; padding: 4px 9px; border-radius: var(--r-chip); background: var(--c-panel-2); color: var(--c-ink); font-size: var(--fs-meta); vertical-align: middle; }
.article-card { display: flex; flex-direction: column; align-items: flex-start; gap: 20px; padding: 32px; border: 1px solid var(--c-line); border-radius: var(--r-card); background: var(--c-bg); color: var(--c-ink); min-width: 0; }
.article-meta { display: flex; flex-wrap: wrap; align-items: center; gap: 12px; color: var(--c-muted); font-size: var(--fs-small); }
.article-card p { color: var(--c-muted); }
.article-card .text-link { margin-top: auto; }
.callout { border-left: 3px solid var(--c-accent); padding: 24px 28px; border-radius: 0 var(--r-card) var(--r-card) 0; background: var(--c-panel); color: var(--c-ink); }
.callout-title { display: block; font-weight: var(--fw-medium); margin-bottom: 8px; }
.callout-note { background: var(--c-panel-2); color: var(--c-ink); border-color: var(--c-violet); }
.table-scroll { overflow-x: auto; max-width: 100%; min-width: 0; -webkit-overflow-scrolling: touch; }
.data-table { border-collapse: collapse; width: 100%; font-size: var(--fs-small); }
.data-table th, .data-table td, .prose table th, .prose table td { min-width: 7em; padding: 16px 20px; text-align: left; border-bottom: 1px solid var(--c-line); overflow-wrap: normal; word-break: normal; }
.data-table th, .prose table th { background: var(--c-panel); color: var(--c-ink); font-weight: var(--fw-medium); }
.prose table { display: block; overflow-x: auto; -webkit-overflow-scrolling: touch; max-width: 100%; min-width: 0; border-collapse: collapse; margin-block: 24px; }
.prose table code, .data-table code { overflow-wrap: anywhere; }
.article-download { margin-top: 48px; padding: 32px; border-radius: var(--r-stage); background: var(--c-panel-2); color: var(--c-ink); }
.article-download p { margin-block: 16px 24px; }
.dl-fab { position: fixed; z-index: 15; right: 24px; bottom: 24px; display: inline-flex; align-items: center; gap: 12px; max-width: calc(100% - 32px); padding: 16px 20px; border: 1px solid var(--c-ink); border-radius: var(--r-btn); background: var(--c-bg); color: var(--c-ink); font-size: var(--fs-small); }
.dl-fab svg { width: 22px; height: 22px; }
.dl-fab:hover { background: var(--c-panel); color: var(--c-ink); }
.preview-section { padding-top: 88px; padding-bottom: 40px; }
.preview-section > h2 { margin-bottom: 32px; }
.preview-stack > * + * { margin-top: 24px; }
.swatches { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: 16px; }
.swatch { min-width: 0; font-family: var(--f-mono); font-size: var(--fs-meta); }
.swatch i { display: block; height: 80px; margin-bottom: 8px; border-radius: var(--r-btn); border: 1px solid var(--c-line); }
.sw-bg { background: var(--c-bg); }
.sw-panel { background: var(--c-panel); }
.sw-panel2 { background: var(--c-panel-2); }
.sw-line { background: var(--c-line); }
.sw-strong { background: var(--c-line-strong); }
.sw-dot { background: var(--c-dot); }
.sw-accent { background: var(--c-accent); }
.sw-dark { background: var(--c-accent-dark); }
.sw-white { background: var(--c-on-accent); }
.sw-ink { background: var(--c-ink); }
.sw-muted { background: var(--c-muted); }
.sw-success { background: var(--c-success); }
.sw-warn { background: var(--c-warn); }
.sw-error { background: var(--c-error); }
.sw-ultra { background: var(--c-ultra); }
.sw-violet { background: var(--c-violet); }
.sw-lime { background: var(--c-lime); }
.sw-mint { background: var(--c-mint); }
.sw-lime-line { background: var(--c-lime-line); }
.sw-code-text { background: var(--c-code-text); }
.sw-code-key { background: var(--c-code-key); }
.sw-code-dim { background: var(--c-code-dim); }
.sw-code-line { background: var(--c-code-line); }
.sw-clear { background: var(--c-clear); }
@media (max-width: 1180px) {
  .board { left: auto; right: -300px; }
}
@media (max-width: 900px) {
  .hero { height: auto; }
  .hero-copy { width: auto; padding-top: 56px; padding-bottom: 32px; }
  .board { position: relative; left: -40px; right: auto; height: 720px; }
  .dl-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .dl-card:nth-child(3) { border-left: 0; }
  .dl-card:nth-child(n+3) { border-top: 1px solid var(--c-line); }
  .feature-rails { grid-template-columns: minmax(0, 1fr); gap: 24px; }
  .feature-rails .tab-list { flex-direction: row; flex-wrap: wrap; }
  .feature-rails .tab-button { width: auto; }
}
@media (max-width: 640px) {
  .hero-title { line-height: 1.12; }
  .hero-copy { padding-top: 48px; }
  .hero-desc { font-size: var(--fs-body); margin-top: 28px; }
  .hero .chips { gap: 6px; }
  .hero .chip { font-size: var(--fs-meta); padding-inline: 8px; }
  .platforms { gap: 14px 20px; margin-top: 28px; }
  .board { left: -20px; width: 840px; height: 485px; transform: scale(0.62); transform-origin: left top; margin-bottom: -150px; }
  .route-card { transform: none; }
  .dl-zone { margin-inline: 16px; padding-top: 48px; padding-bottom: 48px; }
  .dl-zone .frame { padding-inline: 16px; }
  .dl-grid { grid-template-columns: minmax(0, 1fr); }
  .dl-card + .dl-card { border-left: 0; border-top: 1px solid var(--c-line); }
  .dl-card { min-height: 220px; padding: 24px; }
  .feature-stage { padding: 28px 24px; }
  .feature-rails .tab-button { padding: 12px; font-size: var(--fs-small); }
  .mini-window { margin-top: -44px; padding: 16px; }
  .mini-window .row { flex-wrap: wrap; padding-block: 8px; }
  .term-card, .client-card, .article-card, .article-download { padding: 24px; }
  .callout { padding: 20px; }
  .dl-fab { right: 16px; bottom: 16px; padding: 12px 16px; }
}
@media (prefers-reduced-motion: reduce) {
  .hero-title .ln, .hl::before { animation: none; }
}