/* ============================================================
   半岛赛场 · /assets/site.css
   共享层：reset / 变量 / 中文排版 / 页头 / 页脚 / 通用组件
   ============================================================ */

/* ---------- 1. reset ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body,
h1, h2, h3, h4, h5, h6,
p, ul, ol, li, figure, blockquote, address, dl, dd { margin: 0; padding: 0; }

ul, ol { list-style: none; }

a { color: inherit; text-decoration: none; }

button { font: inherit; color: inherit; background: none; border: 0; padding: 0; cursor: pointer; }

img, svg, video { display: block; max-width: 100%; }

address { font-style: normal; }

[hidden] { display: none !important; }

/* ---------- 2. 变量 ---------- */
:root {
  --ink: #05080F;
  --deep: #0B1B33;
  --rail: #14335C;
  --scale-blue: #2E6BA8;
  --orange: #FF6A1A;
  --ember: #FFB27A;
  --green: #2FBF71;
  --yellow: #FFD23F;
  --chalk: #F4F7FB;
  --mist: #9BA9BD;
  --black: #000000;

  --line: rgba(46, 107, 168, 0.35);
  --line-strong: rgba(46, 107, 168, 0.55);

  --sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono: ui-monospace, SFMono-Regular, "JetBrains Mono", "IBM Plex Mono", Menlo, Consolas, monospace;

  --radius-lg: 32px;
  --radius-md: 24px;
  --radius-sm: 16px;
  --pill: 999px;

  --header-h: 88px;
  --rail-w: 104px;
  --maxw: 1360px;
  --gutter: clamp(18px, 4vw, 56px);
  --gap-band: clamp(56px, 8vw, 96px);

  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

/* ---------- 3. 基础排版 ---------- */
body {
  background-color: var(--ink);
  color: var(--chalk);
  font-family: var(--sans);
  font-size: 17px;
  font-weight: 500;
  line-height: 1.9;
  min-height: 100vh;
  overflow-x: hidden;
}

h1, h2, h3, h4 {
  font-weight: 900;
  letter-spacing: -0.02em;
  line-height: 1.06;
  color: var(--chalk);
}

h1 { font-size: clamp(40px, 6vw, 88px); }
h2 { font-size: clamp(28px, 3.4vw, 44px); }
h3 { font-size: clamp(20px, 2vw, 28px); line-height: 1.3; }
h4 { font-size: 18px; line-height: 1.5; }

p { max-width: 42ch; }

strong { font-weight: 800; color: var(--chalk); }

::selection { background: var(--orange); color: var(--ink); }

:focus-visible {
  outline: 2px solid var(--orange);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ---------- 4. 布局骨架 ---------- */
#main-content { padding-top: var(--header-h); display: block; }

.bleed-top { margin-top: calc(var(--header-h) * -1); }

.container {
  width: min(100% - (var(--gutter) * 2), var(--maxw));
  margin-inline: auto;
}

.container--narrow { max-width: 820px; }

.section { margin-top: var(--gap-band); }

.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 16px 32px;
  margin-bottom: clamp(28px, 4vw, 56px);
}

.section-num {
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.16em;
  color: var(--orange);
  display: block;
  margin-bottom: 10px;
}

.section-title { max-width: 22ch; }

.section-note {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--mist);
  line-height: 1.8;
  max-width: 32ch;
}

.grid { display: grid; gap: clamp(16px, 2vw, 32px); }
.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }

/* ---------- 5. 页头 ---------- */
.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 200;
  padding: 10px 20px;
  border-radius: var(--pill);
  background: var(--orange);
  color: var(--ink);
  font-weight: 800;
  transform: translateY(-180%);
  transition: transform 200ms var(--ease);
}

.skip-link:focus { transform: translateY(0); }

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 90;
  background-color: transparent;
  border-bottom: 1px solid transparent;
  transition: background-color 240ms var(--ease), border-color 240ms var(--ease);
}

.site-header[data-scrolled="true"] {
  background-color: rgba(11, 27, 51, 0.94);
  border-bottom-color: var(--rail);
  backdrop-filter: blur(12px) saturate(120%);
}

.scroll-progress {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 2px;
  display: block;
  background: linear-gradient(90deg, var(--orange), var(--yellow));
  transform: scaleX(0);
  transform-origin: 0 50%;
  transition: transform 120ms linear;
}

.header-inner {
  width: min(100% - (var(--gutter) * 2), var(--maxw));
  margin-inline: auto;
  min-height: var(--header-h);
  display: flex;
  align-items: center;
  gap: clamp(12px, 2vw, 28px);
}

.brand {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 2px;
  flex: 0 0 auto;
}

.brand-mark {
  font-size: 20px;
  font-weight: 900;
  letter-spacing: 0.02em;
  color: var(--chalk);
  line-height: 1.2;
}

.brand-note {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--scale-blue);
}

.site-nav { flex: 1 1 auto; display: flex; justify-content: center; }

.nav-list { display: flex; align-items: center; gap: 4px; }

.nav-item { flex: 0 0 auto; }

.nav-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 16px;
  border-radius: var(--pill);
  font-size: 15px;
  font-weight: 600;
  color: var(--mist);
  border: 1px solid transparent;
  transition: color 180ms var(--ease), background-color 180ms var(--ease), border-color 180ms var(--ease);
}

.nav-link::before {
  content: attr(data-num);
  display: none;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--scale-blue);
}

.nav-link:hover { color: var(--chalk); background-color: rgba(20, 51, 92, 0.6); }

.nav-link[aria-current="page"] {
  background-color: var(--orange);
  border-color: var(--orange);
  color: var(--ink);
  font-weight: 800;
}

.nav-link[aria-current="page"]::before { color: rgba(5, 8, 15, 0.68); }

.nav-cta { display: none; }

.header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-left: auto;
  flex: 0 0 auto;
}

.cta-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 11px 22px;
  border-radius: var(--pill);
  background: var(--orange);
  color: var(--ink);
  font-size: 15px;
  font-weight: 800;
  white-space: nowrap;
  transition: background-color 180ms var(--ease), transform 180ms var(--ease);
}

.cta-pill:hover { background-color: var(--ember); transform: translateY(-1px); }

.save-wrap { position: relative; }

.save-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 18px;
  border: 1px solid var(--rail);
  border-radius: var(--pill);
  color: var(--mist);
  font-size: 14px;
  font-weight: 700;
  transition: color 180ms var(--ease), border-color 180ms var(--ease);
}

.save-btn:hover,
.save-btn[aria-expanded="true"] { color: var(--chalk); border-color: var(--orange); }

.save-icon { font-size: 15px; color: var(--orange); }

.save-label { white-space: nowrap; }

.save-tip {
  position: absolute;
  right: 0;
  top: calc(100% + 12px);
  width: 258px;
  padding: 14px 16px;
  border: 1px solid var(--rail);
  border-radius: var(--radius-sm);
  background: var(--deep);
  color: var(--mist);
  font-family: var(--mono);
  font-size: 12px;
  line-height: 1.7;
  letter-spacing: 0.02em;
  box-shadow: 0 18px 40px rgba(0, 0, 0, 0.55);
  max-width: none;
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  padding: 10px 16px;
  border: 1px solid var(--rail);
  border-radius: var(--pill);
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--chalk);
  flex: 0 0 auto;
}

.nav-toggle-bars {
  position: relative;
  display: block;
  width: 18px;
  height: 12px;
}

.nav-toggle-bars::before,
.nav-toggle-bars::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--orange);
  border-radius: 2px;
  transition: transform 200ms var(--ease), top 200ms var(--ease);
}

.nav-toggle-bars::before { top: 0; }
.nav-toggle-bars::after { top: 10px; }

.nav-toggle[aria-expanded="true"] .nav-toggle-bars::before { top: 5px; transform: rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::after { top: 5px; transform: rotate(-45deg); }

body[data-nav-locked="true"] { overflow: hidden; }

/* ---------- 6. 页脚 ---------- */
.site-footer {
  margin-top: var(--gap-band);
  padding: clamp(48px, 7vw, 96px) 0 32px;
  background-color: var(--black);
  border-top: 1px solid var(--rail);
  color: var(--chalk);
}

.footer-inner {
  width: min(100% - (var(--gutter) * 2), var(--maxw));
  margin-inline: auto;
}

.footer-brand {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px 20px;
  padding-bottom: 28px;
  border-bottom: 1px solid var(--line);
}

.footer-brand-mark { font-size: 28px; font-weight: 900; letter-spacing: 0.02em; }

.footer-brand-note {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--scale-blue);
}

.footer-brand-line {
  flex: 1 1 320px;
  max-width: 46ch;
  font-size: 15px;
  color: var(--mist);
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: clamp(20px, 3vw, 48px);
  padding: 40px 0;
}

.footer-col { min-width: 0; }

.footer-col-title {
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--scale-blue);
  margin-bottom: 16px;
}

.footer-list { display: flex; flex-direction: column; gap: 10px; }

.footer-link {
  font-size: 15px;
  color: var(--mist);
  transition: color 180ms var(--ease);
}

.footer-link:hover { color: var(--orange); }

.footer-contact { display: flex; flex-direction: column; gap: 10px; }

.footer-contact-row {
  font-family: var(--mono);
  font-size: 12px;
  line-height: 1.8;
  letter-spacing: 0.02em;
  color: var(--mist);
  word-break: break-word;
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 10px 28px;
  padding-top: 24px;
  border-top: 1px solid var(--line);
}

.footer-fine {
  max-width: 60ch;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--mist);
}

/* ---------- 7. 按钮 / 标签 / 说明牌 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 26px;
  border: 1px solid transparent;
  border-radius: var(--pill);
  font-size: 15px;
  font-weight: 800;
  transition: transform 180ms var(--ease), background-color 180ms var(--ease),
              border-color 180ms var(--ease), color 180ms var(--ease);
}

.btn--primary { background: var(--orange); color: var(--ink); }
.btn--primary:hover { background: var(--ember); transform: translateY(-2px); }

.btn--ghost { border-color: var(--rail); color: var(--chalk); }
.btn--ghost:hover { border-color: var(--orange); color: var(--orange); }

.pill-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 18px;
  border: 1px solid var(--rail);
  border-radius: var(--pill);
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--chalk);
  transition: border-color 180ms var(--ease), color 180ms var(--ease);
}

.pill-link::after { content: "→"; color: var(--orange); }
.pill-link:hover { border-color: var(--orange); color: var(--orange); }

.tag {
  display: inline-flex;
  align-items: center;
  padding: 5px 12px;
  border: 1px solid var(--line);
  border-radius: var(--pill);
  background: rgba(20, 51, 92, 0.35);
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--mist);
  white-space: nowrap;
}

.tag--orange { border-color: var(--orange); color: var(--orange); }
.tag--green { border-color: var(--green); color: var(--green); }
.tag--yellow { border-color: var(--yellow); color: var(--yellow); }
.tag--blue { border-color: var(--scale-blue); color: var(--scale-blue); }

.plate {
  padding: 14px 18px;
  border: 1px solid var(--line);
  border-left: 2px solid var(--scale-blue);
  border-radius: var(--radius-sm);
  background: rgba(11, 27, 51, 0.72);
}

.plate-label {
  display: block;
  margin-bottom: 6px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--scale-blue);
}

.plate-body {
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist);
  max-width: 46ch;
}

.band {
  height: 6px;
  width: 100%;
  border-radius: var(--pill);
  background: var(--orange);
}

.band--green { background: var(--green); }
.band--blue { background: var(--rail); }

/* ---------- 8. 卡片与错落堆叠 ---------- */
.card {
  position: relative;
  padding: clamp(20px, 3vw, 32px);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: linear-gradient(160deg, rgba(20, 51, 92, 0.55), rgba(11, 27, 51, 0.92));
  transition: border-color 200ms var(--ease), transform 200ms var(--ease);
}

.card:hover { border-color: var(--orange); transform: translateY(-4px); }

.stack-grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: clamp(16px, 2vw, 28px);
}

.stack-grid > .card:nth-child(3n + 1) { grid-column: span 5; }
.stack-grid > .card:nth-child(3n + 2) { grid-column: span 3; margin-top: 32px; }
.stack-grid > .card:nth-child(3n + 3) { grid-column: span 4; margin-top: 12px; }

/* ---------- 9. 框景 ---------- */
.frame {
  position: relative;
  padding: clamp(22px, 4vw, 52px);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-lg);
  background: radial-gradient(120% 140% at 12% 0%, rgba(20, 51, 92, 0.65), rgba(5, 8, 15, 0.9) 68%);
  --tick: var(--orange);
}

.frame::before {
  content: "";
  position: absolute;
  inset: 12px;
  pointer-events: none;
  background:
    linear-gradient(var(--tick), var(--tick)) left top / 18px 2px no-repeat,
    linear-gradient(var(--tick), var(--tick)) left top / 2px 18px no-repeat,
    linear-gradient(var(--tick), var(--tick)) right top / 18px 2px no-repeat,
    linear-gradient(var(--tick), var(--tick)) right top / 2px 18px no-repeat,
    linear-gradient(var(--tick), var(--tick)) left bottom / 18px 2px no-repeat,
    linear-gradient(var(--tick), var(--tick)) left bottom / 2px 18px no-repeat,
    linear-gradient(var(--tick), var(--tick)) right bottom / 18px 2px no-repeat,
    linear-gradient(var(--tick), var(--tick)) right bottom / 2px 18px no-repeat;
}

/* ---------- 10. 章节轨 ---------- */
.chapter-rail {
  position: fixed;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  z-index: 40;
  width: var(--rail-w);
  padding-left: 22px;
  display: none;
  flex-direction: column;
  gap: 18px;
}

.rail-link {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--scale-blue);
  writing-mode: vertical-rl;
  transition: color 180ms var(--ease);
}

.rail-link:hover { color: var(--chalk); }

.rail-link[aria-current="true"] { color: var(--orange); }

.rail-num { color: inherit; }

/* ---------- 11. 横向铁轨 ---------- */
.rail { position: relative; }

.rail-track {
  display: flex;
  gap: clamp(14px, 2vw, 24px);
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  scroll-behavior: smooth;
  padding: 4px 2px 22px;
  scrollbar-width: none;
  -ms-overflow-style: none;
}

.rail-track::-webkit-scrollbar { display: none; }

.rail-item { flex: 0 0 min(78vw, 420px); scroll-snap-align: start; }

.rail-btn {
  position: absolute;
  top: 40%;
  transform: translateY(-50%);
  z-index: 3;
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--rail);
  border-radius: var(--pill);
  background: rgba(11, 27, 51, 0.92);
  color: var(--chalk);
  font-size: 16px;
}

.rail-btn:hover { border-color: var(--orange); color: var(--orange); }

.rail-btn[data-rail-prev] { left: -6px; }
.rail-btn[data-rail-next] { right: -6px; }

.rail-dots { display: flex; gap: 8px; align-items: center; }

.rail-dot {
  width: 8px;
  height: 8px;
  border-radius: var(--pill);
  background: var(--rail);
  transition: width 200ms var(--ease), background-color 200ms var(--ease);
}

.rail-dot.is-active { width: 22px; background: var(--orange); }

/* ---------- 12. 影像容器 ---------- */
.figure {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--deep);
}

.figure-media {
  position: relative;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: linear-gradient(135deg, var(--deep), var(--ink) 62%, rgba(255, 106, 26, 0.14));
}

.figure-media--wide { aspect-ratio: 21 / 9; }
.figure-media--tall { aspect-ratio: 3 / 4; }
.figure-media--square { aspect-ratio: 1 / 1; }

.figure-media > img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: contrast(1.06) saturate(1.05);
}

.figure-cap {
  padding: 12px 18px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--mist);
}

/* ---------- 13. 面��屑 ---------- */
.breadcrumbs { margin: 28px 0 8px; }

.breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--mist);
}

.breadcrumb-link { color: var(--mist); }
.breadcrumb-link:hover { color: var(--orange); }

.breadcrumb-sep { color: var(--scale-blue); }

.breadcrumb-item[aria-current="page"] { color: var(--chalk); }

/* ---------- 14. 筛选 ---------- */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: clamp(20px, 3vw, 32px);
}

.filter-btn {
  padding: 8px 18px;
  border: 1px solid var(--rail);
  border-radius: var(--pill);
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--mist);
  transition: color 180ms var(--ease), background-color 180ms var(--ease), border-color 180ms var(--ease);
}

.filter-btn:hover { color: var(--chalk); border-color: var(--scale-blue); }

.filter-btn[aria-pressed="true"] {
  background: var(--orange);
  border-color: var(--orange);
  color: var(--ink);
  font-weight: 700;
}

.filter-item {
  opacity: 1;
  transition: opacity 200ms var(--ease);
}

.filter-item.is-fading { opacity: 0.25; }

.filter-item[data-hidden="true"] { display: none; }

/* ---------- 15. 对比表 ---------- */
.compare-wrap {
  overflow-x: auto;
  border: 1px solid var(--rail);
  border-radius: var(--radius-md);
  background: rgba(11, 27, 51, 0.6);
}

.compare-table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.04em;
}

.compare-table th,
.compare-table td {
  padding: 14px 18px;
  text-align: left;
  white-space: nowrap;
  border-bottom: 1px solid var(--line);
}

.compare-table thead th {
  position: sticky;
  top: 0;
  z-index: 2;
  background: var(--deep);
  color: var(--scale-blue);
  font-size: 12px;
  letter-spacing: 0.08em;
}

.compare-table tbody tr:last-child td { border-bottom: 0; }

.compare-table th:first-child,
.compare-table td:first-child {
  position: sticky;
  left: 0;
  z-index: 1;
  background: var(--ink);
  color: var(--chalk);
}

.compare-table thead th:first-child { z-index: 3; }

/* ---------- 16. 法律版式 ---------- */
.legal-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 280px;
  gap: clamp(24px, 4vw, 64px);
  align-items: start;
  padding: clamp(24px, 4vw, 56px);
  border-radius: var(--radius-lg);
  background: var(--black);
  border: 1px solid var(--rail);
}

.legal-note {
  font-family: var(--mono);
  font-size: 12px;
  line-height: 1.9;
  letter-spacing: 0.02em;
  color: var(--mist);
  position: sticky;
  top: calc(var(--header-h) + 24px);
}

/* ---------- 17. 显现 ---------- */
.js-reveal .reveal {
  opacity: 0;
  transform: translateY(8px);
  transition: opacity 320ms var(--ease), transform 320ms var(--ease);
}

.js-reveal .reveal.is-in { opacity: 1; transform: none; }

/* ---------- 18. 响应式 ---------- */
@media (min-width: 1200px) {
  .chapter-rail { display: flex; }
}

@media (max-width: 1024px) {
  :root { --header-h: 72px; }

  .nav-toggle { display: inline-flex; }

  .site-nav {
    position: fixed;
    left: 0;
    right: 0;
    top: var(--header-h);
    bottom: auto;
    max-height: calc(100vh - var(--header-h));
    overflow-y: auto;
    display: none;
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    gap: 0;
    padding: 24px var(--gutter) 44px;
    background: var(--deep);
    border-bottom: 1px solid var(--rail);
  }

  .site-nav[data-open="true"] { display: flex; animation: navIn 240ms var(--ease); }

  .nav-list { flex-direction: column; align-items: stretch; gap: 2px; }

  .nav-link {
    justify-content: space-between;
    padding: 16px 18px;
    border-radius: var(--radius-sm);
    font-size: 18px;
    color: var(--chalk);
  }

  .nav-link::before { display: inline; }

  .nav-cta {
    display: block;
    margin-top: 20px;
    padding: 16px 18px;
    border-radius: var(--pill);
    background: var(--orange);
    color: var(--ink);
    font-size: 16px;
    font-weight: 800;
    text-align: center;
  }

  .cta-pill { display: none; }

  .stack-grid > .card:nth-child(n) { grid-column: span 6; margin-top: 0; }
  .stack-grid > .card:nth-child(3n) { grid-column: span 12; }

  .legal-layout { grid-template-columns: minmax(0, 1fr); }
  .legal-note { position: static; }
}

@media (max-width: 900px) {
  .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 720px) {
  body { font-size: 16px; }
  p { max-width: 38ch; }

  .save-label { display: none; }
  .save-btn { padding: 10px 14px; }
  .save-tip { right: auto; left: 0; width: min(268px, 76vw); }

  .rail-btn { display: none; }
  .rail-item { flex-basis: 84vw; }

  .grid--2, .grid--3 { grid-template-columns: minmax(0, 1fr); }
  .stack-grid > .card:nth-child(n) { grid-column: span 12; }

  .compare-table th, .compare-table td { padding: 12px 14px; }
}

@media (max-width: 560px) {
  .footer-grid { grid-template-columns: minmax(0, 1fr); }
  .footer-brand-line { flex-basis: 100%; }
}

@media (max-width: 480px) {
  .brand-note { display: none; }
  .header-inner { gap: 10px; }
}

/* ---------- 19. 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
  .js-reveal .reveal { opacity: 1; transform: none; }
  .card:hover { transform: none; }
  .cta-pill:hover { transform: none; }
  .rail-track { scroll-behavior: auto; }
}

@keyframes navIn {
  from { opacity: 0; transform: translateY(-8px); }
  to { opacity: 1; transform: none; }
}