/* 能力页签：每组以 data-tabs 包裹，panel 的 id 同时作为 URL hash。 */
.features {
  max-width: 1200px;
  margin-inline: auto;
  padding: 160px 32px 140px;
  text-align: center;
}
.tabs, [role="tablist"] {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 30px;
}
.tab {
  position: relative;
  isolation: isolate;
  min-height: 42px;
  max-width: 100%;
  padding: 8px 20px;
  border: 0;
  border-radius: var(--r-pill);
  background: var(--c-panel-2);
  color: var(--c-text);
  font-size: var(--text-nav);
  overflow: hidden;
}
.tab::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background: var(--c-accent);
  color: var(--c-text);
  transform: scaleX(0);
  transform-origin: 0 50%;
  transition: transform .45s var(--ease);
}
.tab[aria-selected="true"] {
  background: var(--c-accent-dark);
  color: var(--c-on-accent);
}
.tab[aria-selected="true"]::before {
  background: var(--c-accent-dark);
  transform: scaleX(1);
}
.panel {
  position: relative;
  isolation: isolate;
  display: grid;
  grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  gap: 56px;
  margin-top: 36px;
  padding: 64px 64px 0;
  border-radius: var(--r-section);
  background: var(--c-panel-2);
  color: var(--c-text);
  text-align: left;
}
.panel-copy { padding-bottom: 64px; }
.panel-eyebrow { color: var(--c-accent-dark); font-size: var(--text-sm); font-weight: var(--weight-title); }
.panel-title { margin: 12px 0 0; font-size: 24px; line-height: 1.35; }
.panel-text { margin: 16px 0 0; color: var(--c-muted); font-size: var(--text-nav); line-height: 1.8; }
.panel-text code { color: var(--c-indigo-ink); font-size: var(--text-sm); }
.panel-copy .btn-outline { margin-top: 26px; }
.subcard {
  align-self: end;
  min-width: 0;
  margin-bottom: -40px;
  border: 1px solid var(--c-border);
  border-radius: var(--r-xl);
  background: var(--c-panel);
  color: var(--c-text);
  box-shadow: var(--shadow-card);
  overflow: hidden;
}
.subcard-head { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 8px; padding: 16px 20px 10px; color: var(--c-muted); font-size: var(--text-xs); }
.subcard-head b { font-family: var(--font-mono); }
.group { margin: 0; padding: 0; list-style: none; }
.group li { position: relative; display: grid; grid-template-columns: minmax(0, 1fr) auto; align-items: center; gap: 16px; padding: 15px 20px; }
.group li + li::before { content: ""; position: absolute; top: 0; left: 20px; right: 0; height: 1px; background: var(--c-border); color: var(--c-text); }
.rule { display: block; font-family: var(--font-mono); font-size: var(--text-sm); overflow-wrap: anywhere; }
.rule .kw { color: var(--c-indigo-ink); }
.rule-note { display: block; margin-top: 3px; color: var(--c-muted); font-size: var(--text-xs); }
.chev { width: 8px; height: 13px; color: var(--c-muted); }
.subcard-foot { padding: 12px 20px 18px; border-top: 1px solid var(--c-border); background: var(--c-soft); color: var(--c-muted); font-size: var(--text-xs); }
.protocols { display: flex; flex-wrap: wrap; gap: 10px; padding: 20px; }

/* 长页目录默认不吸顶，避免父容器行程不足。 */
.toc {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 16px;
  border: 1px solid var(--c-border);
  border-radius: var(--r-xl);
  background: var(--c-panel);
  color: var(--c-text);
}
.toc a { display: inline-flex; align-items: center; min-height: 44px; padding: 8px 16px; border-radius: var(--r-pill); font-size: var(--text-nav); }
.toc a:hover, .toc a[aria-current="location"] { background: var(--c-panel-2); color: var(--c-text); }

.faq-list { display: grid; gap: 12px; }
.faq-item { border: 1px solid var(--c-border); border-radius: var(--r-lg); background: var(--c-panel); color: var(--c-text); }
.faq-item summary {
  position: relative;
  min-height: 64px;
  padding: 20px 56px 20px 24px;
  list-style: none;
  cursor: pointer;
  font-weight: var(--weight-title);
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after { content: "+"; position: absolute; top: 20px; right: 24px; color: var(--c-accent-dark); }
.faq-item[open] summary::after { content: "−"; }
.faq-answer { padding: 0 24px 24px; color: var(--c-muted); }
.faq-answer > :last-child { margin-bottom: 0; }

.term-card { padding: 28px; border: 1px solid var(--c-border); border-radius: var(--r-xl); background: var(--c-panel); color: var(--c-text); }
.term-card h3 { margin: 14px 0 12px; }
.term-card p { margin: 0; color: var(--c-muted); }
.term-card .term-original { font-family: var(--font-mono); color: var(--c-indigo-ink); font-size: var(--text-sm); }
.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  max-width: 100%;
  padding: 4px 11px;
  border: 1px solid var(--c-border);
  border-radius: var(--r-pill);
  background: var(--c-panel);
  color: var(--c-muted);
  font-size: var(--text-xs);
  overflow-wrap: anywhere;
}
.badge-indigo { background: var(--c-indigo-tint); color: var(--c-indigo-ink); border-color: var(--c-clear); }
.badge-success { background: var(--c-success-tint); color: var(--c-success-ink); border-color: var(--c-clear); }
.badge-accent { background: var(--c-accent-tint); color: var(--c-accent-dark); border-color: var(--c-clear); }

.app-store-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  min-height: 56px;
  padding: 10px 24px;
  border: 1px solid var(--c-clear);
  border-radius: var(--r-pill);
  background: var(--c-accent);
  color: var(--c-on-accent);
  box-shadow: var(--shadow-btn);
  text-align: left;
  transition: transform var(--time-fast) var(--ease), background-color var(--time-fast) var(--ease);
}
.app-store-button:hover { background: var(--c-accent-dark); color: var(--c-on-accent); transform: translateY(-1px); }
.app-store-button svg { width: 26px; height: 28px; }
.app-store-button small { display: block; font-size: var(--text-xs); line-height: 1.4; }
.app-store-button strong { display: block; font-size: var(--text-body); line-height: 1.4; }
.app-store-button.is-hover { background: var(--c-accent-dark); color: var(--c-on-accent); }
.fact-row {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 8px;
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
}
.fact-pill {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  max-width: 100%;
  padding: 6px 12px;
  border: 1px solid var(--c-border);
  border-radius: var(--r-pill);
  background: var(--c-panel);
  color: var(--c-muted);
  font-size: var(--text-xs);
  overflow-wrap: anywhere;
}
.fact-pill svg, .fact-pill .eyebrow-dot { flex-shrink: 0; }

.official-shot { width: 100%; max-width: 280px; flex-shrink: 0; margin: 0 auto; }
.official-shot img { display: block; width: 100%; height: auto; border-radius: 10px; }
.official-shot img, .shot-placeholder { border: 1px solid var(--c-border); }
.official-shot figcaption { padding-top: 12px; color: var(--c-muted); font-size: var(--text-sm); text-align: center; }
.shot-row { display: flex; justify-content: center; align-items: flex-start; flex-wrap: wrap; gap: 32px; }
.shot-placeholder {
  display: grid;
  place-items: center;
  width: 100%;
  aspect-ratio: 750 / 1334;
  border-radius: var(--r-shot);
  background: var(--c-panel-2);
  color: var(--c-muted);
  text-align: center;
}
.shot-placeholder span { padding: 20px; }
.device-card { display: grid; grid-template-columns: auto minmax(0, 1fr); gap: 24px; align-items: start; }
.device-card > svg { width: 52px; height: 64px; color: var(--c-text); }
.device-card h3 { margin: 0 0 12px; }
.device-card p { color: var(--c-muted); }
.device-card .btn-outline { margin-top: 8px; }

.article-card {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 16px;
  padding: 28px;
  border: 1px solid var(--c-border);
  border-radius: var(--r-section);
  background: var(--c-panel);
  color: var(--c-text);
  box-shadow: var(--shadow-near);
}
.article-card h3 { margin: 0; }
.article-card p { color: var(--c-muted); margin: 0; }
.article-card .text-link { margin-top: auto; }
.article-meta { display: flex; flex-wrap: wrap; align-items: center; gap: 12px; color: var(--c-muted); font-size: var(--text-xs); }
.callout {
  margin: 28px 0;
  padding: 24px;
  border: 1px solid var(--c-border);
  border-left: 3px solid var(--c-accent);
  border-radius: var(--r-lg);
  background: var(--c-panel);
  color: var(--c-text);
}
.callout > :last-child { margin-bottom: 0; }
.callout strong { color: var(--c-accent-dark); }
.callout-info { border-left-color: var(--c-indigo); }
.callout-info strong { color: var(--c-indigo-ink); }
.callout-success { border-left-color: var(--c-success); }
.callout-success strong { color: var(--c-success-ink); }

.table-scroll { max-width: 100%; min-width: 0; overflow-x: auto; overscroll-behavior-x: contain; -webkit-overflow-scrolling: touch; }
.data-table { width: 100%; border-collapse: collapse; background: var(--c-panel); color: var(--c-text); font-size: var(--text-nav); }
.data-table th, .data-table td, .prose table th, .prose table td,
.doc-content table th, .doc-content table td {
  min-width: 7em;
  padding: 16px 20px;
  border: 1px solid var(--c-border);
  text-align: left;
  vertical-align: top;
  word-break: normal;
  overflow-wrap: normal;
}
.data-table th, .prose table th, .doc-content table th { background: var(--c-panel-2); color: var(--c-text); font-weight: var(--weight-title); }
.prose table, .doc-content table {
  display: block;
  max-width: 100%;
  min-width: 0;
  overflow-x: auto;
  border-collapse: collapse;
  -webkit-overflow-scrolling: touch;
  overscroll-behavior-x: contain;
  background: var(--c-panel);
  color: var(--c-text);
}
.data-table code, .prose table code, .doc-content table code { overflow-wrap: anywhere; word-break: normal; }

.dl-fab {
  position: fixed;
  z-index: 30;
  right: max(20px, env(safe-area-inset-right));
  bottom: max(20px, env(safe-area-inset-bottom));
  display: flex;
  align-items: center;
  gap: 12px;
  max-width: calc(100vw - 32px);
  min-height: 56px;
  padding: 12px 20px;
  border: 1.5px solid var(--c-accent);
  border-radius: var(--r-lg);
  background: var(--c-panel);
  color: var(--c-text);
  box-shadow: var(--shadow-float);
  font-size: var(--text-nav);
}
.dl-fab svg { width: 22px; height: 22px; color: var(--c-accent-dark); }
.dl-fab small { display: block; color: var(--c-muted); font-size: var(--text-xs); }
.article-store-card { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 24px; margin-top: 64px; }
.article-store-card h2 { margin: 0 0 12px; font-size: var(--text-h3); }
.article-store-card p { margin: 0; color: var(--c-muted); }
.article-store-card > div { flex: 1 1 280px; }

/* 预览家具 */
.preview-section { padding-top: var(--space-section); }
.preview-section > h2 { margin: 0 0 32px; }
.preview-label { margin-top: 28px; margin-bottom: 16px; color: var(--c-muted); font-size: var(--text-sm); }
.palette-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 16px; }
.palette-item { padding: 12px; border: 1px solid var(--c-border); border-radius: var(--r-lg); background: var(--c-panel); color: var(--c-text); }
.palette-item code { display: block; margin-top: 10px; font-size: var(--text-xs); }
.swatch { height: 58px; border: 1px solid var(--c-border); border-radius: var(--r-sm); color: var(--c-text); }
.swatch-bg { background: var(--c-bg); }
.swatch-panel { background: var(--c-panel); }
.swatch-panel2 { background: var(--c-panel-2); }
.swatch-soft { background: var(--c-soft); }
.swatch-code { background: var(--c-code); }
.swatch-bezel { background: var(--c-bezel); }
.swatch-border { background: var(--c-border); }
.swatch-border-strong { background: var(--c-border-strong); }
.swatch-sketch { background: var(--c-sketch); }
.swatch-bar { background: var(--c-bar); }
.swatch-accent { background: var(--c-accent); }
.swatch-accent-dark { background: var(--c-accent-dark); }
.swatch-accent-tint { background: var(--c-accent-tint); }
.swatch-accent-glow { background: var(--c-accent-glow); }
.swatch-indigo { background: var(--c-indigo); }
.swatch-indigo-ink { background: var(--c-indigo-ink); }
.swatch-indigo-tint { background: var(--c-indigo-tint); }
.swatch-success { background: var(--c-success); }
.swatch-success-ink { background: var(--c-success-ink); }
.swatch-success-tint { background: var(--c-success-tint); }
.swatch-warn { background: var(--c-warn); }
.swatch-warn-ink { background: var(--c-warn-ink); }
.swatch-error { background: var(--c-error); }
.swatch-text { background: var(--c-text); }
.swatch-muted { background: var(--c-muted); }
.swatch-faint { background: var(--c-faint); }
.swatch-white { background: var(--c-on-accent); }
.swatch-clear { background: var(--c-clear); }
.swatch-veil { background: var(--c-veil); }
.preview-type h2, .preview-type h3 { margin-top: 24px; }
.preview-facts { margin-top: 64px; }
.preview-fab { position: static; width: fit-content; margin-top: 24px; }

@media (max-width: 960px) {
  .panel { grid-template-columns: minmax(0, 1fr); gap: 24px; padding: 40px 28px 0; }
  .panel-copy { padding-bottom: 0; }
  .palette-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}
@media (max-width: 640px) {
  .features { padding: 160px 16px 100px; }
  .panel { padding-inline: 20px; }
  .tab { padding-inline: 14px; font-size: var(--text-sm); }
  .panel-title { font-size: var(--text-h3); }
  .group li { padding-inline: 16px; }
  .rule { font-size: var(--text-xs); }
  .fact-row { flex-direction: row; flex-wrap: wrap; justify-content: center; }
  .fact-pill { padding: 5px 10px; }
  .shot-row { flex-direction: column; align-items: center; }
  .official-shot { width: 100%; max-width: 280px; }
  .device-card { gap: 16px; }
  .device-card > svg { width: 38px; height: 52px; }
  .palette-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .article-store-card { align-items: flex-start; }
}