/* =========================================================
   kaixuan-news.com.cn 共享样式表 /assets/site.css
   数字航海日志 · 深渊墨蓝 + 凯旋金 + 电光青
   ========================================================= */

/* ---------- 1. 变量 ---------- */
:root {
  --ink: #0A1A2A;
  --ink-2: #12293D;
  --ink-3: #08131F;
  --line: #24455F;
  --gold: #E0B45C;
  --gold-soft: #F7D68A;
  --cyan: #35E0D6;
  --amber: #F2A63B;
  --archive: #45B98C;
  --paper: #E9EFF5;
  --muted: #8CA3B8;

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

  --shell: 1240px;
  --gutter: 2.5rem;

  --bd: 2px solid var(--line);
  --hard: 6px 6px 0 rgba(4, 11, 18, 0.62);
  --dur: 180ms;
  --ease: ease-out;
  --nav-h: 72px;
}

/* ---------- 2. Reset ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 7rem;
}

body,
h1, h2, h3, h4, h5, p, figure, blockquote, dl, dd { margin: 0; }

ul, ol { margin: 0; padding: 0; list-style: none; }

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

button, input, select, textarea { font: inherit; color: inherit; }

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

/* ---------- 3. 基础排版 ---------- */
body {
  min-height: 100vh;
  background-color: var(--ink);
  color: var(--paper);
  font-family: var(--sans);
  font-size: 1rem;
  line-height: 1.85;
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* 海图网格 */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(36, 69, 95, 0.34) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(36, 69, 95, 0.18) 1px, transparent 1px);
  background-size: 88px 88px;
  opacity: 0.45;
  -webkit-mask-image: linear-gradient(to bottom, rgba(0, 0, 0, 0.9), rgba(0, 0, 0, 0) 78%);
  mask-image: linear-gradient(to bottom, rgba(0, 0, 0, 0.9), rgba(0, 0, 0, 0) 78%);
}

/* 右上角冷光 */
body::after {
  content: "";
  position: fixed;
  top: -22vh;
  right: -12vw;
  width: 62vw;
  height: 62vw;
  z-index: 0;
  pointer-events: none;
  background: radial-gradient(circle, rgba(53, 224, 214, 0.11), rgba(53, 224, 214, 0) 62%);
}

main,
.site-footer { position: relative; z-index: 1; }

h1 {
  font-size: clamp(2rem, 5vw, 3.4rem);
  font-weight: 900;
  line-height: 1.13;
  letter-spacing: -0.01em;
  text-wrap: balance;
}

h2 {
  font-size: clamp(1.45rem, 2.8vw, 2.1rem);
  font-weight: 800;
  line-height: 1.28;
  letter-spacing: -0.01em;
}

h3 { font-size: 1.16rem; font-weight: 700; line-height: 1.4; }

h4 { font-size: 1rem; font-weight: 700; line-height: 1.5; }

p { line-height: 1.85; }

.prose { max-width: 70ch; }
.prose > * + * { margin-top: 1.15em; }
.prose h2 { margin-top: 2.2em; }
.prose h3 { margin-top: 1.8em; }
.prose ul,
.prose ol { padding-left: 1.25rem; }
.prose ul li { list-style: square; }
.prose ol li { list-style: decimal; }

.mono,
.meta,
.ver,
.figure-key {
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
}

.meta {
  font-size: 0.775rem;
  letter-spacing: 0.05em;
  color: var(--muted);
  line-height: 1.65;
}

.ver {
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--gold);
}

.ver--cyan { color: var(--cyan); }

.figure-key {
  font-size: 1.6em;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--gold);
}

/* ---------- 4. 布局工具 ---------- */
.shell {
  width: min(calc(100% - var(--gutter)), var(--shell));
  margin-inline: auto;
}

.grid {
  display: grid;
  gap: clamp(1rem, 2vw, 1.75rem);
}

.grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-12 { grid-template-columns: repeat(12, minmax(0, 1fr)); }

.layout-split {
  display: grid;
  grid-template-columns: minmax(0, 3fr) minmax(0, 9fr);
  gap: clamp(1.5rem, 3vw, 3.25rem);
  align-items: start;
}

.rail {
  position: sticky;
  top: calc(var(--nav-h) + 1.25rem);
  display: grid;
  gap: 0.85rem;
  align-content: start;
}

.rail-label {
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  color: var(--muted);
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--line);
}

.section {
  padding-block: clamp(2.5rem, 5vw, 4.5rem);
  border-top: 1px solid rgba(36, 69, 95, 0.55);
}

.section:first-of-type { border-top: 0; padding-top: 0; }

.section-head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: clamp(1rem, 2vw, 1.75rem);
  align-items: start;
  margin-bottom: clamp(1.25rem, 2.5vw, 2rem);
}

.section-num {
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(1.9rem, 4vw, 3rem);
  font-weight: 700;
  line-height: 0.95;
  letter-spacing: -0.03em;
  color: var(--gold);
  opacity: 0.8;
}

.section-kicker {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  color: var(--gold);
  margin-bottom: 0.55rem;
}

.section-kicker::before {
  content: "";
  width: 22px;
  height: 2px;
  background: var(--gold);
  flex: none;
}

.visually-hidden {
  position: absolute !important;
  width: 1px; height: 1px;
  margin: -1px; padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

/* ---------- 5. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.72rem 1.25rem;
  border: var(--bd);
  background: var(--ink-2);
  color: var(--paper);
  font-size: 0.9rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  cursor: pointer;
  transition: transform var(--dur) var(--ease),
    border-color var(--dur) var(--ease),
    background-color var(--dur) var(--ease),
    color var(--dur) var(--ease);
}

.btn:hover {
  border-color: var(--cyan);
  color: var(--cyan);
  transform: translateY(-2px);
}

.btn--gold {
  background: var(--gold);
  border-color: var(--gold);
  color: #0a1a2a;
}

.btn--gold:hover {
  background: var(--gold-soft);
  border-color: var(--gold-soft);
  color: #0a1a2a;
}

.btn--ghost {
  background: transparent;
}

.btn-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

/* ---------- 6. 卡片 / 标签 / 状态 ---------- */
.panel {
  background: var(--ink-2);
  border: var(--bd);
  box-shadow: var(--hard);
  padding: clamp(1.1rem, 2vw, 1.75rem);
}

.panel--flat { box-shadow: none; }

.lift {
  transition: transform var(--dur) var(--ease),
    border-color var(--dur) var(--ease),
    box-shadow var(--dur) var(--ease);
}

.lift:hover,
.lift:focus-within {
  transform: translateY(-2px);
  border-color: var(--cyan);
  box-shadow: 6px 8px 0 rgba(4, 11, 18, 0.68);
}

.tag {
  display: inline-flex;
  align-items: center;
  padding: 0.2rem 0.55rem;
  border: 1px solid var(--line);
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.06em;
  color: var(--muted);
  white-space: nowrap;
}

.tag--gold { border-color: rgba(224, 180, 92, 0.55); color: var(--gold); }
.tag--cyan { border-color: rgba(53, 224, 214, 0.5); color: var(--cyan); }
.tag--amber { border-color: rgba(242, 166, 59, 0.55); color: var(--amber); }
.tag--archive { border-color: rgba(69, 185, 140, 0.55); color: var(--archive); }

.status {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  color: var(--muted);
  white-space: nowrap;
}

.status::before {
  content: "";
  width: 0.55rem;
  height: 0.55rem;
  border-radius: 50%;
  background: var(--line);
  flex: none;
}

.status--live::before {
  background: var(--amber);
  box-shadow: 0 0 0 3px rgba(242, 166, 59, 0.16);
  animation: statusBreath 2.6s ease-in-out infinite;
}

.status--archived::before {
  background: var(--archive);
  box-shadow: 0 0 0 3px rgba(69, 185, 140, 0.14);
}

@keyframes statusBreath {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.45; }
}

/* ---------- 7. 图片容器基础规则 ---------- */
.media {
  position: relative;
  display: block;
  overflow: hidden;
  aspect-ratio: 16 / 10;
  background: linear-gradient(150deg, #12314a 0%, #0a1a2a 62%);
  border: var(--bd);
}

.media > img,
.media > svg,
.media > picture {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

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

.media__overlay {
  position: absolute;
  inset: auto 0 0 0;
  padding: 0.9rem 1rem;
  background: linear-gradient(to top, rgba(10, 26, 42, 0.94), rgba(10, 26, 42, 0));
  font-family: var(--mono);
  font-size: 0.74rem;
  letter-spacing: 0.05em;
  color: var(--paper);
}

.media__caption {
  display: block;
  margin-top: 0.6rem;
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  color: var(--muted);
}

/* ---------- 8. 面包屑 ---------- */
.crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.55rem;
  margin-bottom: 1.25rem;
  font-family: var(--mono);
  font-size: 0.74rem;
  letter-spacing: 0.04em;
  color: var(--muted);
}

.crumbs li {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
}

.crumbs li + li::before {
  content: "/";
  color: var(--line);
}

.crumbs a {
  color: var(--muted);
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.crumbs a:hover {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

.crumbs [aria-current="page"] { color: var(--paper); }

/* ---------- 9. 页头 ---------- */
.skip-link {
  position: absolute;
  left: 1rem;
  top: -5rem;
  z-index: 300;
  padding: 0.65rem 1.1rem;
  background: var(--gold);
  color: #0a1a2a;
  font-weight: 700;
  font-size: 0.88rem;
  border: 2px solid var(--gold-soft);
  transition: top 160ms var(--ease);
}

.skip-link:focus {
  top: 1rem;
  outline: 3px solid var(--cyan);
  outline-offset: 2px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: transparent;
  border-bottom: 2px solid transparent;
  transition: background-color var(--dur) var(--ease),
    border-color var(--dur) var(--ease);
}

.site-header[data-scrolled] {
  background: rgba(8, 19, 31, 0.95);
  border-bottom-color: var(--line);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
}

.header-shell {
  width: min(calc(100% - var(--gutter)), var(--shell));
  margin-inline: auto;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: clamp(1rem, 2vw, 2.25rem);
  padding-block: 0.95rem;
}

/* 品牌 */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  min-width: 0;
}

.brand-glyph {
  display: grid;
  grid-template-columns: repeat(3, 4px);
  align-items: end;
  gap: 3px;
  height: 26px;
  flex: none;
}

.brand-glyph i {
  display: block;
  width: 4px;
  background: var(--gold);
}

.brand-glyph i:nth-child(1) { height: 12px; }
.brand-glyph i:nth-child(2) { height: 19px; background: var(--cyan); }
.brand-glyph i:nth-child(3) { height: 26px; }

.brand-copy {
  display: grid;
  gap: 0.1rem;
  min-width: 0;
}

.brand-title {
  font-size: 1rem;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--paper);
  line-height: 1.2;
}

.brand-tag {
  font-family: var(--mono);
  font-size: 0.66rem;
  letter-spacing: 0.07em;
  color: var(--muted);
  line-height: 1.2;
  white-space: nowrap;
}

/* 主导航 */
.primary-nav { justify-self: center; }

.nav-list {
  display: flex;
  align-items: center;
  gap: 0.15rem;
}

.nav-link {
  display: inline-block;
  padding: 0.45rem 0.7rem;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--paper);
  opacity: 0.82;
  border-bottom: 2px solid transparent;
  white-space: nowrap;
  transition: color var(--dur) var(--ease),
    opacity var(--dur) var(--ease),
    border-color var(--dur) var(--ease),
    background-color var(--dur) var(--ease);
}

.nav-link:hover,
.nav-link:focus-visible {
  opacity: 1;
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

.nav-link[aria-current="page"] {
  opacity: 1;
  color: var(--gold);
  background: rgba(224, 180, 92, 0.1);
  border-bottom-color: var(--gold);
}

/* 工具区 */
.header-utilities {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 0.7rem;
}

.search-bar {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  min-width: 15rem;
  padding: 0.5rem 0.8rem;
  border: var(--bd);
  background: rgba(18, 41, 61, 0.72);
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.755rem;
  letter-spacing: 0.04em;
  transition: border-color var(--dur) var(--ease),
    color var(--dur) var(--ease),
    background-color var(--dur) var(--ease);
}

.search-bar:hover,
.search-bar:focus-visible {
  border-color: var(--cyan);
  color: var(--cyan);
  background: rgba(18, 41, 61, 0.95);
}

.search-mark {
  position: relative;
  width: 0.7rem;
  height: 0.7rem;
  border: 1.5px solid currentColor;
  border-radius: 50%;
  flex: none;
}

.search-mark::after {
  content: "";
  position: absolute;
  right: -4px;
  bottom: -3px;
  width: 6px;
  height: 1.5px;
  background: currentColor;
  transform: rotate(45deg);
}

.search-hint {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.android-chip {
  font-family: var(--mono);
  font-size: 0.66rem;
  letter-spacing: 0.08em;
  color: var(--archive);
  border: 1px dashed rgba(69, 185, 140, 0.5);
  padding: 0.3rem 0.5rem;
  white-space: nowrap;
}

/* 移动菜单按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 0.75rem;
  border: var(--bd);
  background: var(--ink-2);
  color: var(--paper);
  font-size: 0.82rem;
  font-weight: 700;
  cursor: pointer;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.nav-toggle:hover { border-color: var(--cyan); color: var(--cyan); }

.nav-toggle-icon {
  position: relative;
  display: block;
  width: 16px;
  height: 2px;
  background: currentColor;
  flex: none;
}

.nav-toggle-icon::before,
.nav-toggle-icon::after {
  content: "";
  position: absolute;
  left: 0;
  width: 16px;
  height: 2px;
  background: currentColor;
  transition: transform var(--dur) var(--ease), top var(--dur) var(--ease);
}

.nav-toggle-icon::before { top: -5px; }
.nav-toggle-icon::after { top: 5px; }

.site-header[data-open] .nav-toggle {
  border-color: var(--cyan);
  color: var(--cyan);
}

.site-header[data-open] .nav-toggle-icon { background: transparent; }
.site-header[data-open] .nav-toggle-icon::before { top: 0; transform: rotate(45deg); }
.site-header[data-open] .nav-toggle-icon::after { top: 0; transform: rotate(-45deg); }

/* 阅读进度尺 */
.scroll-meter {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -2px;
  height: 2px;
  overflow: hidden;
  pointer-events: none;
}

.scroll-meter > span {
  display: block;
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--gold), var(--cyan));
}

/* ---------- 10. 页脚 ---------- */
.site-footer {
  margin-top: clamp(3.5rem, 7vw, 7rem);
  background: var(--ink-3);
  border-top: 2px solid var(--line);
}

.footer-shell {
  width: min(calc(100% - var(--gutter)), var(--shell));
  margin-inline: auto;
  padding-block: clamp(2.5rem, 5vw, 4rem) 1.75rem;
}

.footer-top {
  display: grid;
  grid-template-columns: minmax(0, 3.5fr) minmax(0, 8.5fr);
  gap: clamp(1.75rem, 3.5vw, 3.5rem);
}

.footer-brand { display: grid; gap: 0.9rem; align-content: start; }

.footer-intro {
  font-size: 0.9rem;
  color: var(--muted);
  line-height: 1.8;
  max-width: 34ch;
}

.footer-stamps {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: clamp(1rem, 2vw, 1.75rem);
}

.footer-col h3 {
  font-family: var(--mono);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--gold);
  margin: 0 0 0.8rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--line);
}

.footer-col ul {
  display: grid;
  gap: 0.4rem;
}

.footer-col a {
  display: inline-block;
  font-size: 0.86rem;
  color: var(--muted);
  transition: color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.footer-col a:hover,
.footer-col a:focus-visible {
  color: var(--cyan);
  transform: translateX(2px);
}

.footer-contact {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 1.2rem;
  margin-top: clamp(2rem, 4vw, 3rem);
  padding-top: 1.25rem;
  border-top: 1px solid rgba(36, 69, 95, 0.7);
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  color: var(--muted);
}

.footer-note {
  margin-top: 0.6rem;
  font-size: 0.75rem;
  line-height: 1.7;
  color: rgba(140, 163, 184, 0.78);
  max-width: 74ch;
}

.footer-base {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem 1.25rem;
  margin-top: 1.25rem;
  padding-top: 1rem;
  border-top: 1px solid rgba(36, 69, 95, 0.5);
  font-family: var(--mono);
  font-size: 0.735rem;
  letter-spacing: 0.04em;
  color: var(--muted);
}

.footer-base a {
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.footer-base a:hover,
.footer-base a:focus-visible {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

.footer-icp { margin-left: auto; }

/* ---------- 11. 焦点 ---------- */
:focus-visible {
  outline: 3px solid var(--cyan);
  outline-offset: 3px;
}

/* ---------- 12. 响应式 ---------- */
@media (max-width: 1180px) {
  :root { --gutter: 2rem; }
  .search-bar { min-width: 12rem; }
}

@media (max-width: 1024px) {
  .layout-split { grid-template-columns: minmax(0, 1fr); }
  .rail {
    position: static;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.6rem;
    padding-bottom: 0.75rem;
    border-bottom: 1px solid var(--line);
  }
  .rail-label { border-bottom: 0; padding-bottom: 0; }
  .footer-top { grid-template-columns: minmax(0, 1fr); }
  .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid-12 { grid-template-columns: repeat(6, minmax(0, 1fr)); }
  .grid-3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 900px) {
  .header-shell {
    grid-template-columns: minmax(0, 1fr) auto;
    grid-template-areas:
      "brand toggle"
      "search search"
      "nav nav";
    row-gap: 0.7rem;
    align-items: center;
    padding-block: 0.8rem;
  }

  .header-utilities { display: contents; }

  .brand { grid-area: brand; }
  .search-bar { grid-area: search; min-width: 0; width: 100%; }
  .nav-toggle { grid-area: toggle; display: inline-flex; }
  .primary-nav {
    grid-area: nav;
    justify-self: stretch;
    display: none;
  }
  .android-chip { display: none; }

  .site-header[data-open] .primary-nav {
    display: block;
    border-top: 1px solid var(--line);
    padding-top: 0.5rem;
    animation: navDrop 160ms var(--ease);
  }

  .site-header[data-open] {
    background: rgba(8, 19, 31, 0.97);
    border-bottom-color: var(--line);
    -webkit-backdrop-filter: blur(10px);
    backdrop-filter: blur(10px);
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }

  .nav-link {
    display: block;
    padding: 0.72rem 0.2rem;
    border-bottom: 1px solid rgba(36, 69, 95, 0.6);
    border-left: 2px solid transparent;
    opacity: 1;
  }

  .nav-link:hover,
  .nav-link:focus-visible {
    border-bottom-color: rgba(53, 224, 214, 0.6);
    border-left-color: var(--cyan);
  }

  .nav-link[aria-current="page"] {
    border-bottom-color: rgba(224, 180, 92, 0.5);
    border-left-color: var(--gold);
  }
}

@keyframes navDrop {
  from { opacity: 0; transform: translateY(-4px); }
  to { opacity: 1; transform: none; }
}

@media (max-width: 720px) {
  :root { --gutter: 1.75rem; }

  body { font-size: 0.97rem; }

  .section-head {
    grid-template-columns: minmax(0, 1fr);
    gap: 0.5rem;
  }

  .grid-2,
  .grid-3,
  .grid-12 { grid-template-columns: minmax(0, 1fr); }

  .footer-grid { grid-template-columns: minmax(0, 1fr); }
  .footer-icp { margin-left: 0; }
  .btn { width: 100%; justify-content: center; }
  .media__caption { font-size: 0.7rem; }
}

@media (max-width: 420px) {
  .search-hint { font-size: 0.7rem; }
  .brand-tag { display: none; }
}

/* ---------- 13. 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    transition-delay: 0ms !important;
  }

  .lift:hover,
  .lift:focus-within,
  .btn:hover,
  .footer-col a:hover { transform: none; }
}