/* ==========================================================================
   永盈会指南 · 版本档案馆 — /assets/site.css
   共享外壳：重置 · 变量 · 中文排版 · 刊头 · 页脚 · 通用组件
   ========================================================================== */

/* 1. 重置与变量
   ------------------------------------------------------------------ */
*, *::before, *::after { box-sizing: border-box; }

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

:root {
  /* 色板 */
  --c-deep: #0B1B2B;
  --c-ink: #12283D;
  --c-old: #2A3644;
  --c-old-tag: #6C7E92;
  --c-cyan: #2FE0C8;
  --c-green: #19C6A0;
  --c-gold: #E8B45A;
  --c-gold-dark: #8A6A2E;
  --c-paper: #F2F5F7;
  --c-shale: #9AA8B5;

  /* 线与材质 */
  --line: rgba(154, 168, 181, 0.18);
  --line-strong: rgba(154, 168, 181, 0.34);
  --shadow-soft: 0 1px 0 rgba(255, 255, 255, 0.03), 0 18px 42px -30px rgba(0, 0, 0, 0.92);
  --radius: 2px;

  /* 版式 */
  --container: 1200px;
  --font-sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", "Noto Sans CJK SC", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", "Courier New", monospace;
}

body {
  margin: 0;
  background-color: var(--c-deep);
  background-image:
    radial-gradient(1200px 520px at 10% -10%, rgba(47, 224, 200, 0.07), transparent 62%),
    radial-gradient(900px 460px at 100% 0%, rgba(232, 180, 90, 0.05), transparent 60%);
  background-repeat: no-repeat;
  color: var(--c-paper);
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.85;
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

/* 2. 基础排版
   ------------------------------------------------------------------ */
h1, h2, h3, h4, h5, h6 {
  margin: 0 0 0.6em;
  font-family: var(--font-sans);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.25;
  color: var(--c-paper);
}
h1 { font-size: clamp(34px, 5.2vw, 56px); }
h2 { font-size: clamp(24px, 3.4vw, 32px); }
h3 { font-size: clamp(18px, 2.2vw, 20px); }
p { margin: 0 0 1em; }
p:last-child { margin-bottom: 0; }
small { font-size: 13px; color: var(--c-shale); }

a { color: var(--c-cyan); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { color: var(--c-paper); }

img, svg, video { display: block; max-width: 100%; height: auto; }
ul, ol { padding-left: 1.15em; }
button { font: inherit; color: inherit; }
table { border-collapse: collapse; width: 100%; }

:focus-visible {
  outline: 2px solid var(--c-cyan);
  outline-offset: 3px;
  border-radius: var(--radius);
}
::selection { background: var(--c-cyan); color: var(--c-deep); }

.site-main { display: block; padding-bottom: 48px; }
#main-content { scroll-margin-top: 120px; }
section[id], h2[id], h3[id] { scroll-margin-top: 120px; }

/* 3. 布局工具
   ------------------------------------------------------------------ */
.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}
.section { padding: 64px 0; }
.section--tight { padding: 38px 0; }

.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 12px 24px;
  padding-bottom: 14px;
  margin-bottom: 28px;
  border-bottom: 1px solid var(--line);
}
.section-head__title { margin: 0; }
.section-head__note {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--c-old-tag);
}

.grid { display: grid; gap: 20px; }
.grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.grid--split { grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr); }

/* 4. 标签 / 索引 / 按钮 / 卡片
   ------------------------------------------------------------------ */
.mono-label,
.mono-tag {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  line-height: 1.5;
  text-transform: uppercase;
}
.mono-label { color: var(--c-old-tag); }

.mono-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 8px;
  border: 1px solid rgba(47, 224, 200, 0.35);
  border-radius: var(--radius);
  background: rgba(47, 224, 200, 0.07);
  color: var(--c-cyan);
}
.mono-tag--gold {
  border-color: rgba(232, 180, 90, 0.44);
  background: rgba(232, 180, 90, 0.09);
  color: var(--c-gold);
}
.mono-tag--archive {
  border-color: var(--line-strong);
  background: rgba(108, 126, 146, 0.14);
  color: var(--c-old-tag);
}

.tag {
  display: inline-block;
  padding: 2px 7px;
  border: 1px solid rgba(108, 126, 146, 0.32);
  border-radius: var(--radius);
  background: rgba(108, 126, 146, 0.16);
  color: var(--c-old-tag);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
}
.tag--new { border-color: rgba(25, 198, 160, 0.42); background: rgba(25, 198, 160, 0.16); color: var(--c-green); }
.tag--cyan { border-color: rgba(47, 224, 200, 0.38); background: rgba(47, 224, 200, 0.13); color: var(--c-cyan); }
.tag--gold { border-color: rgba(232, 180, 90, 0.4); background: rgba(232, 180, 90, 0.14); color: var(--c-gold); }

.index-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding-left: 9px;
  border-left: 2px solid var(--c-cyan);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--c-cyan);
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 11px 20px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: rgba(242, 245, 247, 0.03);
  color: var(--c-paper);
  font-size: 15px;
  letter-spacing: 0.04em;
  text-decoration: none;
  transition: color 0.2s ease-out, border-color 0.2s ease-out, background-color 0.2s ease-out, transform 0.2s ease-out;
}
.btn:hover {
  color: var(--c-cyan);
  border-color: rgba(47, 224, 200, 0.6);
  background: rgba(47, 224, 200, 0.09);
  transform: translateY(-1px);
}
.btn--ghost { background: transparent; }
.btn--gold {
  border-color: rgba(232, 180, 90, 0.55);
  background: rgba(232, 180, 90, 0.08);
  color: var(--c-gold);
}
.btn--gold:hover { border-color: var(--c-gold); background: rgba(232, 180, 90, 0.16); color: #F6D79B; }
.btn--solid {
  border-color: var(--c-green);
  background: var(--c-green);
  color: #06231C;
  font-weight: 700;
}
.btn--solid:hover { background: var(--c-cyan); border-color: var(--c-cyan); color: #04241F; }

.card {
  position: relative;
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(180deg, rgba(18, 40, 61, 0.92), rgba(11, 27, 43, 0.94));
  box-shadow: var(--shadow-soft);
  transition: border-color 0.2s ease-out, transform 0.2s ease-out, background-color 0.2s ease-out;
}
.card:hover { border-color: rgba(47, 224, 200, 0.36); transform: translateY(-2px); }
.card--new { border-color: rgba(25, 198, 160, 0.42); }
.card--new:hover { border-color: var(--c-green); }
.card--archive {
  background: linear-gradient(180deg, rgba(42, 54, 68, 0.58), rgba(18, 40, 61, 0.68));
  border-color: rgba(108, 126, 146, 0.3);
}
.card--archive:hover { border-color: rgba(154, 168, 181, 0.48); transform: none; }
.card__title { margin: 0 0 8px; font-size: 18px; }
.card__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--c-old-tag);
}

/* 5. 面包屑
   ------------------------------------------------------------------ */
.breadcrumb {
  padding: 16px 0 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--c-old-tag);
}
.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.breadcrumb li { display: inline-flex; align-items: center; gap: 6px; }
.breadcrumb li::after { content: "/"; color: rgba(108, 126, 146, 0.7); }
.breadcrumb li:last-child::after { content: ""; }
.breadcrumb a { color: var(--c-shale); text-decoration: none; }
.breadcrumb a:hover { color: var(--c-cyan); }

/* 6. 图片容器（页面阶段放图用）
   ------------------------------------------------------------------ */
.media-frame,
.img-frame {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(155deg, rgba(47, 224, 200, 0.09), rgba(11, 27, 43, 0) 58%), var(--c-ink);
  aspect-ratio: 16 / 9;
  box-shadow: var(--shadow-soft);
}
.img-frame--wide { aspect-ratio: 21 / 9; }
.img-frame--tall { aspect-ratio: 3 / 4; }
.img-frame--square { aspect-ratio: 1 / 1; }
.media-frame img,
.img-frame img { width: 100%; height: 100%; object-fit: cover; }
.media-grid {
  display: grid;
  gap: 16px;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

/* 7. 动效
   ------------------------------------------------------------------ */
.reveal {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.32s ease-out, transform 0.32s ease-out;
}
.reveal[data-delay="1"] { transition-delay: 0.06s; }
.reveal[data-delay="2"] { transition-delay: 0.12s; }
.reveal[data-delay="3"] { transition-delay: 0.18s; }
.reveal.is-visible { opacity: 1; transform: none; }

/* 8. 刊头（Header）
   ------------------------------------------------------------------ */
.skip-link {
  position: absolute;
  left: 16px;
  top: -80px;
  z-index: 200;
  padding: 10px 16px;
  border: 1px solid var(--c-cyan);
  border-radius: var(--radius);
  background: var(--c-ink);
  color: var(--c-cyan);
  font-size: 14px;
  text-decoration: none;
  transition: top 0.18s ease-out;
}
.skip-link:focus { top: 12px; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: linear-gradient(180deg, #0B1B2B 0%, #0D2033 100%);
  border-bottom: 1px solid var(--line-strong);
}
.site-header::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: linear-gradient(90deg, rgba(232, 180, 90, 0), var(--c-gold-dark), rgba(232, 180, 90, 0));
  opacity: 0.65;
  pointer-events: none;
}
.header-inner { position: relative; padding-top: 12px; }

.masthead {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
  align-items: center;
  gap: 14px 24px;
  padding: 6px 0 12px;
  border-bottom: 1px solid var(--line);
  transition: padding 0.24s ease-out;
}

.masthead__meta {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0;
  min-width: 0;
}
.masthead__meta--right { justify-content: flex-end; }
.masthead__sub {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--c-old-tag);
  white-space: nowrap;
  transition: opacity 0.2s ease-out;
}

.brand {
  display: grid;
  justify-items: center;
  gap: 4px;
  padding: 2px 10px;
  color: inherit;
  text-decoration: none;
}
.brand__mark {
  padding: 2px 6px 2px 10px;
  border: 1px solid rgba(47, 224, 200, 0.35);
  border-radius: var(--radius);
  background: rgba(47, 224, 200, 0.06);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.32em;
  color: var(--c-cyan);
}
.brand__name {
  font-size: clamp(20px, 3vw, 30px);
  font-weight: 800;
  letter-spacing: 0.22em;
  line-height: 1.15;
  color: var(--c-paper);
  transition: font-size 0.24s ease-out, letter-spacing 0.24s ease-out;
}
.brand:hover .brand__name { color: var(--c-cyan); }
.brand__tag {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.34em;
  color: var(--c-shale);
  transition: opacity 0.2s ease-out;
}

.index-marks {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: flex-end;
  gap: 6px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.index-mark {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 8px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--c-shale);
  text-decoration: none;
  transition: color 0.18s ease-out, border-color 0.18s ease-out, background-color 0.18s ease-out;
}
.index-mark__id { color: var(--c-cyan); }
.index-mark__txt { white-space: nowrap; }
.index-mark:hover {
  color: var(--c-paper);
  border-color: rgba(47, 224, 200, 0.5);
  background: rgba(47, 224, 200, 0.07);
}
.index-mark--archive .index-mark__id { color: var(--c-old-tag); }
.index-mark--archive:hover { border-color: rgba(108, 126, 146, 0.6); background: rgba(108, 126, 146, 0.14); }
.index-mark--green .index-mark__id { color: var(--c-green); }
.index-mark--green:hover { border-color: rgba(25, 198, 160, 0.5); background: rgba(25, 198, 160, 0.08); }
.index-mark--gold .index-mark__id { color: var(--c-gold); }
.index-mark--gold:hover { border-color: rgba(232, 180, 90, 0.5); background: rgba(232, 180, 90, 0.09); }

.nav-bar {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 14px;
  min-height: 50px;
}
.nav-toggle {
  display: none;
  align-items: center;
  gap: 8px;
  padding: 9px 12px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: transparent;
  color: var(--c-paper);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  cursor: pointer;
  transition: color 0.18s ease-out, border-color 0.18s ease-out;
}
.nav-toggle__bars { display: grid; gap: 3px; width: 16px; }
.nav-toggle__bars i { display: block; height: 1px; background: currentColor; transition: opacity 0.18s ease-out; }
.nav-toggle[aria-expanded="true"] { color: var(--c-cyan); border-color: rgba(47, 224, 200, 0.55); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(2) { opacity: 0.3; }

.site-nav { flex: 0 1 auto; }
.site-nav__list {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 2px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.site-nav a {
  position: relative;
  display: block;
  padding: 12px 15px;
  color: var(--c-shale);
  font-size: 15px;
  letter-spacing: 0.04em;
  text-decoration: none;
  transition: color 0.18s ease-out;
}
.site-nav a::after {
  content: "";
  position: absolute;
  left: 15px;
  right: 15px;
  bottom: 8px;
  height: 1px;
  background: var(--c-cyan);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.22s ease-out;
}
.site-nav a:hover { color: var(--c-paper); }
.site-nav a:hover::after { transform: scaleX(1); }
.site-nav a[aria-current="page"] { color: var(--c-cyan); }
.site-nav a[aria-current="page"]::after { transform: scaleX(1); background: var(--c-gold); }

.nav-bar__note {
  position: absolute;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.24em;
  color: var(--c-old-tag);
}

.scroll-progress {
  position: absolute;
  left: 0;
  bottom: 0;
  z-index: 3;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--c-cyan), var(--c-green) 58%, var(--c-gold));
  transition: width 0.12s linear;
}

/* 刊头收拢态 */
.site-header[data-condensed] .header-inner { padding-top: 8px; }
.site-header[data-condensed] .masthead { padding: 2px 0 6px; }
.site-header[data-condensed] .masthead__sub,
.site-header[data-condensed] .brand__tag { opacity: 0; visibility: hidden; }
.site-header[data-condensed] .brand__name { font-size: 20px; letter-spacing: 0.16em; }
.site-header[data-condensed] .site-nav a { padding: 9px 15px; font-size: 14px; }
.site-header[data-condensed] .nav-bar { min-height: 44px; }

/* 回到常用入口 */
.quick-return {
  position: fixed;
  right: 18px;
  bottom: 18px;
  z-index: 90;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 16px;
  border: 1px solid rgba(255, 255, 255, 0.22);
  border-radius: var(--radius);
  background: linear-gradient(180deg, var(--c-gold), #D9A344);
  color: #1B1204;
  font-size: 14px;
  letter-spacing: 0.04em;
  text-decoration: none;
  box-shadow: 0 16px 32px -18px rgba(0, 0, 0, 0.95);
  transition: transform 0.2s ease-out, background-color 0.2s ease-out;
}
.quick-return::before {
  content: "";
  width: 6px;
  height: 6px;
  background: #1B1204;
  transform: rotate(45deg);
}
.quick-return:hover { color: #120C02; transform: translateY(-2px); }

/* 9. 页脚（Footer）
   ------------------------------------------------------------------ */
.site-footer {
  position: relative;
  margin-top: 24px;
  border-top: 1px solid var(--line-strong);
  background: linear-gradient(180deg, #0B1B2B 0%, #091623 100%);
  color: var(--c-shale);
  font-size: 14px;
}
.site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 6px;
  background: repeating-linear-gradient(90deg, rgba(47, 224, 200, 0.5) 0 2px, transparent 2px 12px);
  opacity: 0.5;
}

.footer__grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1.15fr;
  gap: 32px 28px;
  padding: 58px 0 40px;
}
.footer__brand { min-width: 0; }
.footer__brandmark {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0 0 12px;
  font-size: 18px;
  font-weight: 800;
  letter-spacing: 0.12em;
  color: var(--c-paper);
}
.footer__brandmark span:last-child {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 400;
  letter-spacing: 0.3em;
  color: var(--c-old-tag);
}
.footer__brandmark-id {
  padding: 2px 6px 2px 9px;
  border: 1px solid rgba(47, 224, 200, 0.34);
  border-radius: var(--radius);
  background: rgba(47, 224, 200, 0.06);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.28em;
  color: var(--c-cyan);
}
.footer__lede { margin: 0 0 14px; line-height: 1.85; color: var(--c-shale); }
.footer__mono {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--c-old-tag);
}

.footer__col { min-width: 0; }
.footer__title {
  margin: 0 0 14px;
  padding-left: 10px;
  border-left: 2px solid var(--c-gold);
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.18em;
  color: var(--c-paper);
}
.footer__col p { line-height: 1.85; color: var(--c-shale); }

.footer__links {
  display: grid;
  gap: 9px;
  margin: 0 0 4px;
  padding: 0;
  list-style: none;
}
.footer__links a {
  display: inline-block;
  color: var(--c-shale);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.18s ease-out, border-color 0.18s ease-out;
}
.footer__links a:hover { color: var(--c-cyan); border-bottom-color: rgba(47, 224, 200, 0.45); }

.footer__contact { margin: 18px 0 0; }
.footer__contact dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--c-old-tag);
}
.footer__contact dd {
  margin: 2px 0 10px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--c-shale);
  word-break: break-word;
}

.footer__legal {
  border-top: 1px solid var(--line);
  background: rgba(0, 0, 0, 0.22);
}
.footer__legal-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 6px 24px;
  padding: 16px 24px 22px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--c-old-tag);
}
.footer__legal-item { margin: 0; }

/* 10. 响应式
   ------------------------------------------------------------------ */
@media (max-width: 1180px) {
  .nav-bar__note { display: none; }
}

@media (max-width: 1024px) {
  .grid-3, .grid-4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer__grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 30px 24px; }
}

@media (max-width: 900px) {
  body { font-size: 16px; }
  .container { padding: 0 18px; }
  .header-inner { padding-top: 10px; }

  .masthead {
    grid-template-columns: minmax(0, 1fr);
    justify-items: center;
    gap: 10px;
    padding-bottom: 10px;
  }
  .masthead__meta--left { justify-content: center; }
  .masthead__sub { letter-spacing: 0.16em; }
  .masthead__meta--right {
    display: block;
    width: 100%;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    padding-bottom: 2px;
  }
  .index-marks {
    width: max-content;
    flex-wrap: nowrap;
    justify-content: flex-start;
  }
  .brand__name { letter-spacing: 0.18em; }

  .nav-bar {
    justify-content: space-between;
    min-height: 0;
    padding: 8px 0;
  }
  .nav-toggle { display: inline-flex; }
  .site-nav { display: none; flex-basis: 100%; order: 3; }
  .site-header[data-open] .site-nav { display: block; }
  .site-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    margin-top: 8px;
    border-top: 1px solid var(--line);
  }
  .site-nav a {
    padding: 14px 4px;
    border-bottom: 1px solid var(--line);
    font-size: 16px;
  }
  .site-nav a::after { left: 4px; right: auto; width: 68px; bottom: 10px; }

  .section { padding: 48px 0; }
  .grid--split { grid-template-columns: minmax(0, 1fr); }
  .grid { gap: 16px; }
}

@media (max-width: 720px) {
  .grid-2, .grid-3, .grid-4 { grid-template-columns: minmax(0, 1fr); }
  .footer__grid { grid-template-columns: minmax(0, 1fr); padding: 44px 0 32px; }
  .footer__legal-inner { justify-content: flex-start; }
}

@media (max-width: 560px) {
  .quick-return { right: 12px; bottom: 12px; padding: 9px 13px; font-size: 13px; }
  h1 { font-size: clamp(30px, 8vw, 40px); }
  .card { padding: 18px; }
}

/* 11. 焦点与减弱动效
   ------------------------------------------------------------------ */
@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;
  }
  .reveal { opacity: 1 !important; transform: none !important; }
  .card:hover, .btn:hover, .quick-return:hover { transform: none; }
}