/* ============================================================
   完美体育365 · 共享样式 /assets/site.css
   框架式页头 + 档案式页脚 + 通用组件
   ============================================================ */

/* ---------- 1. Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--frame-h, 104px) + 18px);
}
body, h1, h2, h3, h4, h5, p, ul, ol, figure, blockquote, dl, dd { margin: 0; }
ul, ol { padding: 0; list-style: none; }
img, svg, video { display: block; max-width: 100%; height: auto; }
button { font: inherit; color: inherit; }
a { color: inherit; text-decoration: none; }
table { border-collapse: collapse; width: 100%; }

/* ---------- 2. 变量 ---------- */
:root {
  --ink: #0B1F17;
  --char: #141414;
  --slate: #1E2E28;
  --lime: #C6FF3D;
  --lime-soft: #E2FF99;
  --orange: #FF6B1A;
  --sand: #C9A96E;
  --paper: #E8E6E1;
  --steel: #6F7A73;
  --brick: #B33A2B;

  --hair: rgba(201, 169, 110, .22);
  --hair-strong: rgba(201, 169, 110, .44);
  --soft-hair: rgba(111, 122, 115, .30);

  --maxw: 1280px;
  --gutter: clamp(18px, 3.2vw, 44px);
  --frame-h: 104px;
  --ease: cubic-bezier(.22, .61, .36, 1);

  --font-display: "Archivo Black", "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --font-body: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  --font-mono: "JetBrains Mono", "Roboto Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, "PingFang SC", monospace;
}

/* ---------- 3. 基础排版 ---------- */
body {
  min-height: 100vh;
  background-color: var(--ink);
  background-image:
    linear-gradient(180deg, rgba(30, 46, 40, .55) 0, rgba(11, 31, 23, 0) 340px),
    repeating-linear-gradient(90deg, rgba(201, 169, 110, .045) 0 1px, transparent 1px 112px);
  color: var(--paper);
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 400;
  line-height: 1.75;
  letter-spacing: .01em;
  -webkit-font-smoothing: antialiased;
}
h1, h2, h3, h4, h5 {
  font-family: var(--font-display);
  font-weight: 900;
  line-height: 1.06;
  letter-spacing: -.004em;
}
h1 { font-size: clamp(2.6rem, 6vw, 5.4rem); }
h2 { font-size: clamp(1.9rem, 4vw, 3.2rem); }
h3 { font-size: clamp(1.25rem, 2vw, 1.75rem); }
p { overflow-wrap: break-word; }
strong { color: var(--lime); font-weight: 700; }
small { font-size: .8125rem; line-height: 1.4; }
code, kbd, samp {
  font-family: var(--font-mono);
  font-size: .875em;
  color: var(--lime-soft);
  background: rgba(198, 255, 61, .08);
  padding: 1px 6px;
  border: 1px solid rgba(198, 255, 61, .22);
}
hr, .rule { height: 1px; border: 0; background: var(--hair); margin: 0; }
::selection { background: var(--lime); color: var(--ink); }

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

/* ---------- 4. 焦点与跳转链接 ---------- */
:focus-visible,
a:focus-visible,
button:focus-visible,
input:focus-visible,
[tabindex]:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: 3px;
}
.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 200;
  padding: 12px 20px;
  background: var(--lime);
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: .75rem;
  letter-spacing: .12em;
  text-decoration: none;
}
.skip-link:focus,
.skip-link:focus-visible { left: 16px; top: 16px; position: fixed; }

/* ---------- 5. 布局容器与网格 ---------- */
.shell {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 var(--gutter);
}
.section { padding: clamp(44px, 7vw, 96px) 0; }
.section--tight { padding: clamp(26px, 4vw, 52px) 0; }

.grid { display: grid; gap: clamp(16px, 2.2vw, 28px); }
.grid--12 { grid-template-columns: repeat(12, minmax(0, 1fr)); }
.grid--aside { grid-template-columns: minmax(0, 7fr) minmax(0, 4fr); gap: clamp(24px, 3.4vw, 56px); }
.grid--halves { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--auto { grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); }

.span-3 { grid-column: span 3; }
.span-4 { grid-column: span 4; }
.span-5 { grid-column: span 5; }
.span-6 { grid-column: span 6; }
.span-7 { grid-column: span 7; }
.span-8 { grid-column: span 8; }
.span-9 { grid-column: span 9; }
.span-12 { grid-column: span 12; }

/* ---------- 6. 章节头与标签 ---------- */
.eyebrow {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: .6875rem;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--orange);
}
.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 18px;
  padding-bottom: 16px;
  margin-bottom: clamp(22px, 3vw, 38px);
  border-bottom: 1px solid var(--hair);
}
.section-title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2rem, 4.6vw, 3.6rem);
  line-height: 1.04;
}
.section-index {
  font-family: var(--font-mono);
  font-size: .6875rem;
  letter-spacing: .2em;
  color: var(--sand);
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  font-family: var(--font-mono);
  font-size: .6875rem;
  letter-spacing: .1em;
  color: var(--lime);
  background: rgba(198, 255, 61, .10);
  border: 1px solid rgba(198, 255, 61, .34);
}
.tag--orange { color: var(--orange); background: rgba(255, 107, 26, .10); border-color: rgba(255, 107, 26, .36); }
.tag--sand { color: var(--sand); background: rgba(201, 169, 110, .10); border-color: rgba(201, 169, 110, .36); }
.chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 4px 9px;
  font-family: var(--font-mono);
  font-size: .6875rem;
  letter-spacing: .12em;
  color: var(--steel);
  border: 1px dashed var(--soft-hair);
}

/* ---------- 7. 面板 ---------- */
.panel {
  position: relative;
  padding: clamp(20px, 3vw, 34px);
  background: var(--slate);
  border: 1px solid var(--hair);
  clip-path: polygon(0 0, calc(100% - 22px) 0, 100% 22px, 100% 100%, 0 100%);
}
.panel--char { background: var(--char); }
.panel--slate { background: var(--slate); }
.panel--lime { background: var(--lime); color: var(--ink); border-color: var(--lime); }
.panel--lime .section-index, .panel--lime .stat-label { color: rgba(11, 31, 23, .64); }
.panel--cut-lg { clip-path: polygon(0 0, calc(100% - 42px) 0, 100% 42px, 100% 100%, 42px 100%, 0 calc(100% - 42px)); }

/* ---------- 8. 统计数字 ---------- */
.stat { display: flex; flex-direction: column; gap: 6px; }
.stat-value {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(2.5rem, 6vw, 5rem);
  line-height: .95;
  letter-spacing: -.02em;
  color: var(--lime);
}
.stat-value--orange { color: var(--orange); }
.stat-value--sand { color: var(--sand); }
.stat-label {
  font-family: var(--font-mono);
  font-size: .6875rem;
  letter-spacing: .16em;
  color: var(--steel);
  text-transform: uppercase;
}

/* ---------- 9. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 18px;
  font-family: var(--font-mono);
  font-size: .75rem;
  letter-spacing: .1em;
  color: var(--paper);
  background: transparent;
  border: 1px solid transparent;
  cursor: pointer;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 10px), calc(100% - 10px) 100%, 0 100%);
  transition: background-color .22s var(--ease), color .22s var(--ease), border-color .22s var(--ease);
}
.btn--primary { background: var(--orange); color: var(--char); }
.btn--primary:hover { background: var(--lime); color: var(--ink); }
.btn--lime { background: var(--lime); color: var(--ink); }
.btn--lime:hover { background: var(--lime-soft); color: var(--ink); }
.btn--ghost { border-color: var(--hair-strong); color: var(--paper); }
.btn--ghost:hover { border-color: var(--lime); color: var(--lime); }

/* ---------- 10. 面包屑 ---------- */
.breadcrumb {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 20px var(--gutter) 0;
}
.breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0;
  font-family: var(--font-mono);
  font-size: .6875rem;
  letter-spacing: .12em;
  color: var(--steel);
}
.breadcrumb-item { display: inline-flex; align-items: center; }
.breadcrumb-item + .breadcrumb-item::before {
  content: "/";
  margin: 0 10px;
  color: rgba(201, 169, 110, .55);
}
.breadcrumb-link { color: var(--steel); text-decoration: none; }
.breadcrumb-link:hover { color: var(--lime); }
.breadcrumb-current { color: var(--sand); }

/* ---------- 11. 正文排版 ---------- */
.prose { max-width: 68ch; color: rgba(232, 230, 225, .9); }
.prose > * + * { margin-top: 1.05em; }
.prose h2 { margin-top: 1.8em; font-size: clamp(1.6rem, 3vw, 2.3rem); color: var(--paper); }
.prose h3 { margin-top: 1.5em; color: var(--lime-soft); }
.prose p { margin: 0; }
.prose a {
  color: var(--lime);
  border-bottom: 1px solid rgba(198, 255, 61, .45);
}
.prose a:hover { border-bottom-color: var(--lime); }
.prose ul, .prose ol { padding-left: 1.2em; }
.prose ul li { list-style: none; position: relative; }
.prose ul li::before {
  content: "";
  position: absolute; left: -1.1em; top: .72em;
  width: 6px; height: 1px; background: var(--orange);
}
.prose ol { list-style: decimal; }
.prose ol li::marker { color: var(--sand); font-family: var(--font-mono); font-size: .8125rem; }
.prose blockquote {
  padding: 14px 20px;
  border-left: 2px solid var(--lime);
  background: rgba(30, 46, 40, .55);
  color: var(--paper);
}
.prose small { color: var(--steel); font-family: var(--font-mono); }

/* ---------- 12. 图片容器基础规则 ---------- */
.media-frame {
  position: relative;
  display: block;
  width: 100%;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  background: var(--char);
  border: 1px solid var(--hair);
  clip-path: polygon(0 0, calc(100% - 26px) 0, 100% 26px, 100% 100%, 0 100%);
}
.media-frame img,
.media-frame picture,
.media-frame svg,
.media-frame > .media-frame__inner {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(.94) contrast(1.06) brightness(.96);
}
.media-frame--wide { aspect-ratio: 21 / 9; }
.media-frame--tall { aspect-ratio: 3 / 4; }
.media-frame--square { aspect-ratio: 1 / 1; }
.media-frame__tag {
  position: absolute;
  top: 12px; left: 12px;
  padding: 4px 9px;
  font-family: var(--font-mono);
  font-size: .625rem;
  letter-spacing: .14em;
  color: var(--ink);
  background: var(--lime);
}
.media-frame__caption {
  position: absolute;
  left: 0; right: 0; bottom: 0;
  padding: 10px 14px;
  font-family: var(--font-mono);
  font-size: .6875rem;
  letter-spacing: .08em;
  color: var(--paper);
  background: linear-gradient(90deg, rgba(11, 31, 23, .94), rgba(11, 31, 23, .35));
}

/* ---------- 13. 折叠问答 ---------- */
.disclosure-btn {
  display: flex;
  width: 100%;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 16px 18px;
  background: var(--slate);
  border: 1px solid var(--hair);
  color: var(--paper);
  font-family: var(--font-body);
  font-size: 1rem;
  text-align: left;
  cursor: pointer;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 10px), calc(100% - 10px) 100%, 0 100%);
  transition: color .2s var(--ease), border-color .2s var(--ease), background-color .2s var(--ease);
}
.disclosure-btn::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 1.125rem;
  line-height: 1;
  color: var(--orange);
}
.disclosure-btn:hover { border-color: var(--hair-strong); }
.disclosure-btn[aria-expanded="true"] { color: var(--lime); border-color: rgba(198, 255, 61, .45); }
.disclosure-btn[aria-expanded="true"]::after { content: "–"; color: var(--lime); }
.disclosure-panel {
  padding: 16px 18px 20px;
  background: rgba(20, 20, 20, .86);
  border: 1px solid var(--hair);
  border-top: 0;
  color: rgba(232, 230, 225, .88);
}
.disclosure-panel[hidden] { display: none; }

/* ---------- 14. 滚动显现 ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity .4s var(--ease), transform .4s var(--ease);
  transition-delay: var(--reveal-delay, 0ms);
}
[data-reveal].is-visible { opacity: 1; transform: none; }

/* ---------- 15. 页头（框架式导航） ---------- */
.site-frame {
  position: sticky;
  top: 0;
  z-index: 80;
  background: #0B1F17;
  border-bottom: 1px solid var(--hair-strong);
}
.frame-inner {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: clamp(12px, 2vw, 30px);
  width: 100%;
  max-width: var(--maxw);
  min-height: 74px;
  margin: 0 auto;
  padding: 0 var(--gutter);
  border-left: 1px solid var(--hair);
  border-right: 1px solid var(--hair);
}
.frame-brand { display: flex; align-items: center; }

.brand { display: inline-flex; align-items: center; gap: 12px; }
.brand-mark {
  display: grid;
  place-items: center;
  width: 40px; height: 40px;
  background: var(--lime);
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: .8125rem;
  font-weight: 700;
  clip-path: polygon(0 0, 100% 0, 100% 70%, 70% 100%, 0 100%);
}
.brand-text { display: flex; flex-direction: column; line-height: 1.2; }
.brand-name {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 1.0625rem;
  letter-spacing: .01em;
  color: var(--paper);
}
.brand-tag {
  font-family: var(--font-mono);
  font-size: .625rem;
  letter-spacing: .16em;
  color: var(--steel);
}
.brand:hover .brand-name { color: var(--lime); }

/* 主导航 */
.primary-nav {
  display: flex;
  align-items: center;
  justify-content: flex-end;
}
.nav-list {
  display: flex;
  align-items: stretch;
  gap: clamp(2px, .8vw, 10px);
}
.nav-item { display: flex; }
.nav-item + .nav-item { border-left: 1px solid var(--hair); }
.nav-link {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  padding: 26px 10px 24px;
  border-top: 2px solid transparent;
  color: var(--paper);
  font-size: .9375rem;
  transition: color .22s var(--ease), border-color .22s var(--ease);
}
.nav-index {
  font-family: var(--font-mono);
  font-size: .625rem;
  letter-spacing: .04em;
  color: var(--steel);
}
.nav-label { font-weight: 500; }
.nav-link:hover { color: var(--lime); border-top-color: var(--lime); }
.nav-link:hover .nav-index { color: var(--lime); }
.nav-link[aria-current="page"] { color: var(--lime); border-top-color: var(--lime); }
.nav-link[aria-current="page"] .nav-index { color: var(--orange); }
.nav-link[aria-current="page"] .nav-label { font-weight: 700; }

.nav-meta { display: none; }
.nav-meta-item {
  font-size: .875rem;
  color: var(--steel);
  padding: 6px 0;
}
.nav-meta-item--mono { font-family: var(--font-mono); font-size: .75rem; letter-spacing: .1em; }
.nav-meta-link { margin-top: 16px; justify-self: start; }

/* 行动区 / 移动按钮 */
.frame-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  justify-self: end;
}
.frame-cta { white-space: nowrap; }
.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  background: transparent;
  border: 1px solid var(--hair-strong);
  color: var(--paper);
  font-family: var(--font-mono);
  font-size: .6875rem;
  letter-spacing: .14em;
  cursor: pointer;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 8px), calc(100% - 8px) 100%, 0 100%);
  transition: color .2s var(--ease), border-color .2s var(--ease);
}
.nav-toggle:hover { color: var(--lime); border-color: var(--lime); }
.nav-toggle-bars {
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  gap: 4px;
  width: 18px;
  height: 14px;
}
.nav-toggle-bars i {
  display: block;
  height: 1.5px;
  background: currentColor;
  transition: transform .24s var(--ease), opacity .24s var(--ease);
}
.site-frame[data-open] .nav-toggle-bars i:nth-child(1) { transform: translateY(5.5px) rotate(45deg); }
.site-frame[data-open] .nav-toggle-bars i:nth-child(2) { opacity: 0; }
.site-frame[data-open] .nav-toggle-bars i:nth-child(3) { transform: translateY(-5.5px) rotate(-45deg); }
.nav-toggle-label { white-space: nowrap; }

/* 边框底轨 */
.frame-rail {
  display: flex;
  align-items: center;
  gap: 16px;
  width: 100%;
  max-width: var(--maxw);
  height: 30px;
  margin: 0 auto;
  padding: 0 var(--gutter);
  border-left: 1px solid var(--hair);
  border-right: 1px solid var(--hair);
  border-top: 1px solid rgba(201, 169, 110, .16);
  font-family: var(--font-mono);
  font-size: .625rem;
  letter-spacing: .14em;
  color: var(--steel);
  white-space: nowrap;
  overflow: hidden;
}
.rail-item { display: inline-flex; align-items: center; }
.rail-item--lime { color: var(--lime); }
.rail-sep { width: 1px; height: 12px; background: var(--hair); flex: 0 0 auto; }
.rail-progress {
  position: relative;
  flex: 1 1 auto;
  min-width: 70px;
  height: 2px;
  margin-left: auto;
  background: rgba(111, 122, 115, .28);
  overflow: hidden;
}
.rail-bar {
  position: absolute;
  inset: 0;
  transform: scaleX(var(--progress, 0));
  transform-origin: left center;
  background: linear-gradient(90deg, var(--orange), var(--lime));
}

/* ---------- 16. 返回顶部 ---------- */
.to-top {
  position: fixed;
  right: clamp(14px, 2.2vw, 28px);
  bottom: clamp(14px, 2.2vw, 28px);
  z-index: 70;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  background: var(--char);
  color: var(--lime);
  border: 1px solid rgba(198, 255, 61, .42);
  font-family: var(--font-mono);
  font-size: .6875rem;
  letter-spacing: .12em;
  cursor: pointer;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 10px), calc(100% - 10px) 100%, 0 100%);
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: opacity .24s var(--ease), transform .24s var(--ease), visibility .24s, background-color .2s var(--ease), color .2s var(--ease);
}
.to-top[data-visible] { opacity: 1; visibility: visible; transform: none; }
.to-top:hover { background: var(--lime); color: var(--ink); }

/* ---------- 17. 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(48px, 8vw, 100px);
  background: var(--char);
  border-top: 1px solid var(--hair-strong);
  color: var(--paper);
}
.site-footer::before {
  content: "";
  position: absolute;
  top: -1px; left: 0;
  width: min(420px, 42%);
  height: 3px;
  background: linear-gradient(90deg, var(--lime) 0 62%, var(--orange) 62% 88%, var(--sand) 88% 100%);
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1.5fr;
  gap: clamp(22px, 3.4vw, 48px);
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: clamp(34px, 5vw, 66px) var(--gutter) clamp(24px, 3vw, 40px);
}
.footer-block { min-width: 0; }
.footer-brand {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 1.375rem;
  line-height: 1.15;
  color: var(--paper);
}
.footer-tag {
  margin-top: 6px;
  font-family: var(--font-mono);
  font-size: .6875rem;
  letter-spacing: .18em;
  color: var(--sand);
}
.footer-note {
  margin-top: 14px;
  max-width: 36ch;
  font-size: .875rem;
  line-height: 1.7;
  color: var(--steel);
}
.footer-title {
  padding-bottom: 10px;
  margin-bottom: 14px;
  border-bottom: 1px solid var(--hair);
  font-family: var(--font-mono);
  font-size: .6875rem;
  font-weight: 400;
  letter-spacing: .2em;
  color: var(--lime);
}
.footer-links { display: flex; flex-direction: column; gap: 9px; }
.footer-links a {
  display: inline-flex;
  align-items: center;
  font-size: .9375rem;
  color: rgba(232, 230, 225, .82);
  transition: color .2s var(--ease);
}
.footer-links a::before {
  content: "";
  flex: 0 0 auto;
  width: 8px;
  height: 8px;
  margin-right: 10px;
  background: var(--sand);
  clip-path: polygon(0 0, 100% 0, 100% 65%, 65% 100%, 0 100%);
  transition: background-color .2s var(--ease);
}
.footer-links a:hover { color: var(--lime); }
.footer-links a:hover::before { background: var(--lime); }

.footer-contact { display: flex; flex-direction: column; gap: 12px; }
.contact-item { display: flex; flex-wrap: wrap; gap: 4px 12px; align-items: baseline; }
.contact-key {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: .625rem;
  letter-spacing: .14em;
  color: var(--steel);
}
.contact-val {
  font-size: .875rem;
  line-height: 1.6;
  color: rgba(232, 230, 225, .88);
  overflow-wrap: anywhere;
}

.footer-foot {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px 24px;
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 16px var(--gutter) 30px;
  border-top: 1px solid var(--hair);
  font-family: var(--font-mono);
  font-size: .6875rem;
  letter-spacing: .1em;
  color: var(--steel);
}
.footer-legal, .footer-meta { margin: 0; }

/* ---------- 18. 响应式 ---------- */
@media (max-width: 1100px) {
  .frame-cta { display: none; }
}

@media (max-width: 1024px) {
  .grid--aside { grid-template-columns: minmax(0, 1fr); }
  .grid--12 { grid-template-columns: repeat(6, minmax(0, 1fr)); }
  .span-3, .span-4, .span-5, .span-6 { grid-column: span 3; }
  .span-7, .span-8, .span-9, .span-12 { grid-column: span 6; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .footer-block--brand, .footer-block--contact { grid-column: 1 / -1; }
  .footer-note { max-width: 56ch; }
}

@media (max-width: 900px) {
  .frame-inner { grid-template-columns: minmax(0, 1fr) auto; min-height: 66px; }
  .nav-toggle { display: inline-flex; }
  .primary-nav {
    position: fixed;
    left: 0; right: 0;
    top: var(--frame-h, 96px);
    bottom: 0;
    display: block;
    padding: 26px var(--gutter) 56px;
    background: var(--char);
    border-top: 1px solid var(--hair-strong);
    overflow-y: auto;
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transform: translateY(-8px);
    transition: opacity .24s var(--ease), transform .24s var(--ease), visibility .24s;
  }
  .site-frame[data-open] .primary-nav {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transform: none;
  }
  .nav-list { flex-direction: column; gap: 0; width: 100%; }
  .nav-item { display: block; }
  .nav-item + .nav-item { border-left: 0; border-top: 1px solid rgba(201, 169, 110, .18); }
  .nav-link {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    width: 100%;
    padding: 17px 4px;
    border-top: 0;
    border-bottom: 0;
    font-size: 1.125rem;
  }
  .nav-link:hover, .nav-link[aria-current="page"] { border-top-color: transparent; }
  .nav-link[aria-current="page"] { padding-left: 12px; }
  .nav-meta { display: block; margin-top: 26px; }
  .nav-meta-link { display: inline-flex; margin-top: 18px; }
  .frame-rail { gap: 12px; }
}

@media (max-width: 720px) {
  .grid--12 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .span-3, .span-4, .span-5, .span-6, .span-7, .span-8, .span-9, .span-12 { grid-column: 1 / -1; }
  .grid--halves, .grid--auto { grid-template-columns: minmax(0, 1fr); }
  .rail-hide-sm { display: none; }
  .brand-tag { letter-spacing: .1em; }
  .footer-grid { grid-template-columns: minmax(0, 1fr); }
  .footer-block--brand, .footer-block--contact { grid-column: auto; }
  .panel, .panel--cut-lg { clip-path: polygon(0 0, calc(100% - 16px) 0, 100% 16px, 100% 100%, 0 100%); }
  .media-frame { clip-path: polygon(0 0, calc(100% - 16px) 0, 100% 16px, 100% 100%, 0 100%); }
}

@media (max-width: 420px) {
  .nav-toggle { padding: 9px 11px; }
  .brand-mark { width: 34px; height: 34px; font-size: .75rem; }
  .brand-name { font-size: 1rem; }
}

/* ---------- 19. 减弱动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }
  [data-reveal] { opacity: 1; transform: none; }
  .to-top { transform: none; }
  .primary-nav { transform: none; }
}