/* ============================================================
   牌乐门中心 · /assets/site.css
   共享层：reset / tokens / 中文排版 / 头部 / 页脚 / 基础组件
   ============================================================ */

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 104px;
}

body, h1, h2, h3, h4, h5, p, figure, blockquote, ul, ol, dl, dd { margin: 0; }
ul, ol { padding: 0; list-style: none; }
img, svg, video { display: block; max-width: 100%; }
button { font: inherit; color: inherit; background: none; border: 0; padding: 0; cursor: pointer; }
a { color: inherit; text-decoration: none; }
input, select, textarea { font: inherit; }
[hidden] { display: none !important; }

/* ---------- 2. tokens ---------- */
:root {
  /* 品牌色 */
  --felt: #0C2A24;
  --felt-deep: #081C18;
  --moss: #2F6B57;
  --mist: #A8BFB2;
  --gold: #D8A544;
  --gold-soft: #F1DCA6;
  --coral: #E2542C;
  --coral-soft: #F2A78E;
  --paper: #F5F2E9;
  --paper-2: #EDE8D9;
  --stone: #8B9187;
  --ink: #151F1C;

  /* 衍生线色 */
  --line-mist: rgba(168, 191, 178, 0.28);
  --line-gold: rgba(216, 165, 68, 0.42);
  --line-ink: rgba(21, 31, 28, 0.14);

  /* 字体 */
  --font-display: "Noto Serif SC", "Source Han Serif SC", "Source Han Serif CN", "Songti SC", "STSong", ui-serif, Georgia, serif;
  --font-body: "Noto Sans SC", "Source Han Sans SC", "Source Han Sans CN", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;

  /* 节奏 */
  --max: 1280px;
  --gutter: 24px;
  --pad: clamp(20px, 4vw, 48px);
  --space-s: 32px;
  --space-m: 64px;
  --space-l: 96px;
  --header-h: 76px;
  --radius: 2px;

  --ease: cubic-bezier(0.2, 0.6, 0.2, 1);
  --shadow-1: 0 18px 40px -30px rgba(0, 0, 0, 0.9);
}

/* ---------- 3. 基础与中文排版 ---------- */
body {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.78;
  font-weight: 400;
  letter-spacing: 0.005em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

h1, h2, h3, h4, h5 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.12;
  letter-spacing: -0.02em;
}

p { text-wrap: pretty; }

::selection { background: rgba(216, 165, 68, 0.35); color: var(--felt-deep); }

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

.display-xl { font-size: clamp(44px, 7.4vw, 96px); line-height: 1.02; }
.display    { font-size: clamp(34px, 4.6vw, 64px); line-height: 1.08; }
.h2         { font-size: clamp(28px, 3.2vw, 40px); }
.h3         { font-size: clamp(20px, 2vw, 28px); letter-spacing: -0.005em; }

.lede {
  font-size: clamp(17px, 1.5vw, 20px);
  line-height: 1.7;
  max-width: 62ch;
  color: inherit;
  opacity: 0.92;
}

.eyebrow {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--gold);
}
.eyebrow--ink { color: var(--moss); }

.mono {
  font-family: var(--font-mono);
  font-variant-ligatures: none;
  letter-spacing: 0.06em;
}

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

/* 跳转链接 */
.skip-link {
  position: fixed;
  left: 16px;
  top: 12px;
  z-index: 999;
  padding: 10px 16px;
  background: var(--gold);
  color: var(--felt-deep);
  font-size: 14px;
  letter-spacing: 0.04em;
  transform: translateY(-180%);
  transition: transform 0.2s var(--ease);
}
.skip-link:focus-visible { transform: translateY(0); }

/* ---------- 4. 布局容器 ---------- */
.container {
  width: 100%;
  max-width: var(--max);
  margin-inline: auto;
  padding-inline: var(--pad);
}
.container--narrow { max-width: 920px; }

.section {
  position: relative;
  padding-block: clamp(48px, 7vw, 96px);
}
.section--felt  { background: var(--felt); color: var(--paper); }
.section--deep  { background: var(--felt-deep); color: var(--paper); }
.section--paper { background: var(--paper); color: var(--ink); }

.stack > * + * { margin-top: var(--stack, 16px); }

.grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: var(--gutter);
}
.col-4  { grid-column: span 4; }
.col-5  { grid-column: span 5; }
.col-6  { grid-column: span 6; }
.col-7  { grid-column: span 7; }
.col-8  { grid-column: span 8; }
.col-12 { grid-column: span 12; }
.offset-1 { grid-column-start: 2; }

/* ---------- 5. 正文区 ---------- */
.prose {
  max-width: 66ch;
  font-size: 17px;
  line-height: 1.78;
}
.prose > * + * { margin-top: 1.1em; }
.prose h2 { font-size: clamp(24px, 2.4vw, 30px); margin-top: 2.2em; }
.prose h3 { font-size: 20px; margin-top: 1.8em; }
.prose ul { list-style: disc; padding-left: 1.3em; display: flex; flex-direction: column; gap: 0.4em; }
.prose ol { list-style: decimal; padding-left: 1.4em; display: flex; flex-direction: column; gap: 0.4em; }
.prose a { color: var(--moss); border-bottom: 1px solid rgba(47, 107, 87, 0.4); }
.prose a:hover { color: var(--felt); border-bottom-color: var(--felt); }
.prose strong { font-weight: 700; }
.prose blockquote {
  border-left: 2px solid var(--gold);
  padding-left: 20px;
  color: var(--stone);
  font-size: 16px;
}

/* 面包屑 */
.breadcrumb {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--stone);
}
.breadcrumb ol { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; }
.breadcrumb li { display: flex; align-items: center; gap: 8px; }
.breadcrumb li + li::before { content: "/"; color: var(--mist); }
.breadcrumb a:hover { color: var(--gold); }
.breadcrumb--light { color: rgba(168, 191, 178, 0.92); }
.breadcrumb--light a:hover { color: var(--gold-soft); }

/* ---------- 6. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 18px;
  border: 1px solid transparent;
  border-radius: var(--radius);
  font-size: 14px;
  letter-spacing: 0.03em;
  line-height: 1.2;
  white-space: nowrap;
  transition: background 0.18s var(--ease), color 0.18s var(--ease),
              border-color 0.18s var(--ease), transform 0.18s var(--ease);
}
.btn-sm { padding: 9px 14px; font-size: 13px; }

.btn-gold {
  background: var(--gold);
  border-color: var(--gold);
  color: var(--felt-deep);
}
.btn-gold:hover { background: var(--gold-soft); border-color: var(--gold-soft); transform: translateY(-1px); }

.btn-ghost {
  background: transparent;
  border-color: rgba(241, 220, 166, 0.42);
  color: var(--gold-soft);
}
.btn-ghost:hover { background: rgba(241, 220, 166, 0.1); border-color: var(--gold-soft); }

.btn-line {
  background: transparent;
  border-color: rgba(21, 31, 28, 0.28);
  color: var(--felt);
}
.btn-line:hover { border-color: var(--felt); background: rgba(12, 42, 36, 0.05); }

/* ---------- 7. 头部 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 120;
  background: rgba(12, 42, 36, 0.92);
  -webkit-backdrop-filter: blur(10px) saturate(1.1);
  backdrop-filter: blur(10px) saturate(1.1);
  border-bottom: 1px solid rgba(216, 165, 68, 0.18);
  color: var(--paper);
  transition: background 0.24s var(--ease), border-color 0.24s var(--ease),
              box-shadow 0.24s var(--ease);
}
.site-header[data-scrolled="true"] {
  background: var(--felt-deep);
  border-bottom-color: var(--line-gold);
  box-shadow: 0 16px 34px -26px rgba(0, 0, 0, 0.95);
}

.header-inner {
  max-width: var(--max);
  margin-inline: auto;
  padding: 14px var(--pad);
  min-height: var(--header-h);
  display: flex;
  align-items: center;
  gap: clamp(14px, 2.2vw, 36px);
  transition: min-height 0.24s var(--ease), padding 0.24s var(--ease);
}
.site-header[data-scrolled="true"] .header-inner { min-height: 62px; padding-block: 8px; }

/* 品牌 */
.brand { display: inline-flex; align-items: center; gap: 12px; flex: 0 0 auto; }

.brand-mark { position: relative; width: 34px; height: 34px; flex: 0 0 auto; }
.brand-card {
  position: absolute;
  left: 50%;
  bottom: 4px;
  width: 15px;
  height: 21px;
  margin-left: -7.5px;
  border: 1px solid rgba(216, 165, 68, 0.55);
  border-radius: 2px;
  background: rgba(216, 165, 68, 0.08);
  transform-origin: 50% 100%;
  transition: transform 0.28s var(--ease), border-color 0.28s var(--ease);
}
.brand-card:nth-child(1) { transform: rotate(-18deg); }
.brand-card:nth-child(2) { transform: rotate(0deg); background: rgba(216, 165, 68, 0.22); }
.brand-card:nth-child(3) { transform: rotate(18deg); }
.brand:hover .brand-card:nth-child(1) { transform: rotate(-24deg); }
.brand:hover .brand-card:nth-child(3) { transform: rotate(24deg); }

.brand-text { display: block; }
.brand-name {
  display: block;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: 0.04em;
  color: var(--paper);
}
.brand-tagline {
  display: block;
  margin-top: 3px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.14em;
  color: rgba(168, 191, 178, 0.85);
}

/* 移动端按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  margin-left: auto;
  padding: 8px 12px;
  border: 1px solid rgba(241, 220, 166, 0.32);
  border-radius: var(--radius);
  color: var(--gold-soft);
  font-size: 13px;
  letter-spacing: 0.06em;
  transition: border-color 0.18s var(--ease), background 0.18s var(--ease);
}
.nav-toggle:hover { border-color: var(--gold); background: rgba(216, 165, 68, 0.08); }
.nav-toggle-bars { display: inline-flex; flex-direction: column; gap: 4px; width: 18px; }
.nav-toggle-bars span {
  display: block;
  height: 1px;
  background: currentColor;
  transition: transform 0.2s var(--ease), opacity 0.2s var(--ease);
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:nth-child(1) { transform: translateY(5px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:nth-child(3) { transform: translateY(-5px) rotate(-45deg); }

/* 桌面导航 */
.primary-nav {
  display: flex;
  align-items: center;
  gap: clamp(10px, 2vw, 26px);
  margin-left: auto;
}
.nav-list { display: flex; align-items: center; gap: clamp(2px, 1.1vw, 14px); }

.nav-link {
  position: relative;
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  padding: 8px 2px;
  font-size: 15px;
  color: rgba(245, 242, 233, 0.78);
  transition: color 0.18s var(--ease);
}
.nav-link::after {
  content: "";
  position: absolute;
  left: 2px;
  right: 2px;
  bottom: 2px;
  height: 1px;
  background: var(--gold);
  transform: scaleX(0);
  transform-origin: 0 50%;
  transition: transform 0.22s var(--ease);
}
.nav-link:hover { color: var(--gold-soft); }
.nav-link:hover::after { transform: scaleX(1); }
.nav-link[aria-current="page"] { color: var(--gold-soft); }
.nav-link[aria-current="page"]::after { transform: scaleX(1); }
.nav-link[aria-current="page"] .nav-index { color: var(--gold); }

.nav-index {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: rgba(168, 191, 178, 0.7);
  transition: color 0.18s var(--ease);
}

.nav-actions { display: flex; align-items: center; gap: 10px; }

.notice-pill {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 6px 12px 6px 10px;
  border: 1px solid rgba(226, 84, 44, 0.38);
  border-radius: 999px;
  background: rgba(226, 84, 44, 0.14);
  color: var(--coral-soft);
  font-size: 12px;
  letter-spacing: 0.04em;
  white-space: nowrap;
  transition: background 0.18s var(--ease), border-color 0.18s var(--ease);
}
.notice-pill:hover { background: rgba(226, 84, 44, 0.24); border-color: rgba(226, 84, 44, 0.7); }
.notice-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--coral);
  box-shadow: 0 0 0 3px rgba(226, 84, 44, 0.18);
}

/* 滚动进度 */
.scroll-progress {
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 2px;
  background: var(--gold);
  transform: scaleX(0);
  transform-origin: 0 50%;
  pointer-events: none;
  will-change: transform;
}

/* ---------- 8. 右侧快捷条 ---------- */
.side-rail {
  position: fixed;
  right: 16px;
  top: 50%;
  z-index: 110;
  display: flex;
  flex-direction: column;
  gap: 8px;
  opacity: 0;
  pointer-events: none;
  transform: translateY(-50%) translateX(14px);
  transition: opacity 0.24s var(--ease), transform 0.24s var(--ease);
}
.side-rail[data-visible="true"] {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(-50%) translateX(0);
}
.side-rail-link {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 5px;
  width: 44px;
  padding: 9px 0;
  border: 1px solid rgba(216, 165, 68, 0.3);
  border-radius: var(--radius);
  background: rgba(8, 28, 24, 0.86);
  -webkit-backdrop-filter: blur(6px);
  backdrop-filter: blur(6px);
  color: var(--gold-soft);
  transition: background 0.18s var(--ease), border-color 0.18s var(--ease),
              transform 0.18s var(--ease);
}
.side-rail-link:hover {
  background: var(--felt-deep);
  border-color: var(--gold);
  transform: translateX(-2px);
}
.side-rail-icon svg { width: 16px; height: 16px; }
.side-rail-label {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  writing-mode: vertical-rl;
  text-orientation: upright;
}
.side-rail[data-collapsed="true"] .side-rail-label { display: none; }
.side-rail[data-collapsed="true"] .side-rail-link { width: 38px; padding: 8px 0; }

/* ---------- 9. 页脚 ---------- */
.site-footer {
  position: relative;
  overflow: hidden;
  background: var(--felt);
  color: var(--paper);
  border-top: 1px solid var(--line-gold);
  padding-block: clamp(48px, 6vw, 88px) 28px;
}
.footer-inner {
  position: relative;
  z-index: 2;
  max-width: var(--max);
  margin-inline: auto;
  padding-inline: var(--pad);
}
.footer-top {
  display: grid;
  grid-template-columns: minmax(280px, 1fr) 1.4fr;
  gap: clamp(32px, 5vw, 72px);
  padding-bottom: 40px;
  border-bottom: 1px solid var(--line-mist);
}

.brand--footer .brand-name { font-size: 22px; }
.brand--footer .brand-tagline { font-size: 11px; }
.footer-brand-line {
  margin-top: 18px;
  max-width: 34ch;
  font-size: 15px;
  color: rgba(245, 242, 233, 0.78);
}

.footer-contact { margin-top: 24px; display: flex; flex-direction: column; gap: 12px; }
.contact-item { display: flex; flex-direction: column; gap: 2px; }
.contact-label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: rgba(168, 191, 178, 0.9);
}
.contact-value { font-size: 15px; color: rgba(245, 242, 233, 0.86); }

.copy-btn {
  align-self: flex-start;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding-bottom: 2px;
  border-bottom: 1px dashed rgba(216, 165, 68, 0.4);
  color: var(--gold-soft);
  font-size: 15px;
  text-align: left;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
}
.copy-btn::after {
  content: "复制";
  padding: 1px 5px;
  border: 1px solid rgba(168, 191, 178, 0.35);
  border-radius: var(--radius);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.1em;
  color: rgba(168, 191, 178, 0.9);
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
}
.copy-btn:hover { color: var(--gold); border-bottom-color: var(--gold); }
.copy-btn:hover::after { color: var(--gold-soft); border-color: var(--line-gold); }

.footer-nav { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 24px; }
.footer-col-title {
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 400;
  letter-spacing: 0.14em;
  color: var(--gold);
}
.footer-links { display: flex; flex-direction: column; gap: 10px; font-size: 15px; }
.footer-links a {
  display: inline-block;
  color: rgba(245, 242, 233, 0.8);
  border-bottom: 1px solid transparent;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
}
.footer-links a:hover { color: var(--gold-soft); border-bottom-color: var(--line-gold); }

.footer-note {
  margin-top: 22px;
  max-width: 70ch;
  font-size: 13px;
  line-height: 1.7;
  color: rgba(168, 191, 178, 0.95);
}
.footer-bottom {
  margin-top: 26px;
  padding-top: 22px;
  border-top: 1px solid rgba(168, 191, 178, 0.18);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px 28px;
  font-size: 13px;
  color: rgba(168, 191, 178, 0.95);
}
.footer-legal {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
}
.footer-legal-links { display: flex; flex-wrap: wrap; gap: 18px; }
.footer-legal-links a { transition: color 0.18s var(--ease); }
.footer-legal-links a:hover { color: var(--gold-soft); }

.footer-fan {
  position: absolute;
  right: -40px;
  bottom: -70px;
  z-index: 1;
  width: 320px;
  height: 250px;
  opacity: 0.55;
  pointer-events: none;
}
.footer-fan-card {
  position: absolute;
  left: 50%;
  bottom: 0;
  width: 88px;
  height: 126px;
  margin-left: -44px;
  border: 1px solid rgba(216, 165, 68, 0.26);
  border-radius: 3px;
  background: linear-gradient(180deg, rgba(216, 165, 68, 0.07), rgba(216, 165, 68, 0));
  transform-origin: 50% 112%;
}
.footer-fan-card:nth-child(1) { transform: rotate(-26deg); }
.footer-fan-card:nth-child(2) { transform: rotate(-9deg); }
.footer-fan-card:nth-child(3) { transform: rotate(8deg); }
.footer-fan-card:nth-child(4) { transform: rotate(25deg); }

/* ---------- 10. 基础组件 ---------- */
.card {
  position: relative;
  padding: clamp(18px, 2.2vw, 28px);
  border: 1px solid rgba(216, 165, 68, 0.24);
  background: var(--felt-deep);
  color: var(--paper);
  clip-path: polygon(0 0, calc(100% - 18px) 0, 100% 18px, 100% 100%, 18px 100%, 0 calc(100% - 18px));
  transition: transform 0.18s var(--ease), border-color 0.18s var(--ease),
              box-shadow 0.18s var(--ease), background 0.18s var(--ease);
}
.card:hover {
  transform: translateY(-2px);
  border-color: rgba(216, 165, 68, 0.62);
  box-shadow: var(--shadow-1);
}
.card--paper {
  background: #FFFFFF;
  border-color: var(--line-ink);
  color: var(--ink);
}
.card--paper:hover { border-color: rgba(216, 165, 68, 0.8); }

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 9px;
  border: 1px solid rgba(216, 165, 68, 0.3);
  border-radius: var(--radius);
  background: rgba(216, 165, 68, 0.14);
  color: var(--gold-soft);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  line-height: 1.6;
}
.tag--coral {
  background: rgba(226, 84, 44, 0.16);
  border-color: rgba(226, 84, 44, 0.4);
  color: var(--coral-soft);
}
.tag--moss {
  background: rgba(47, 107, 87, 0.18);
  border-color: rgba(47, 107, 87, 0.5);
  color: #CFE0D6;
}

/* 图片容器：页面阶段放入 <img> 或内联 SVG */
.media-frame {
  position: relative;
  display: block;
  overflow: hidden;
  border: 1px solid rgba(216, 165, 68, 0.22);
  border-radius: var(--radius);
  background: var(--felt-deep);
}
.media-frame img,
.media-frame svg,
.media-frame video {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.media-frame--tall   { aspect-ratio: 3 / 4; }
.media-frame--4x3    { aspect-ratio: 4 / 3; }
.media-frame--16x9   { aspect-ratio: 16 / 9; }
.media-frame--square { aspect-ratio: 1 / 1; }

.media-frame__caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 14px 16px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: rgba(245, 242, 233, 0.92);
  background: linear-gradient(transparent, rgba(8, 28, 24, 0.88));
}
.media-frame--empty {
  background-image:
    repeating-linear-gradient(135deg, rgba(168, 191, 178, 0.1) 0 1px, transparent 1px 14px),
    repeating-linear-gradient(45deg, rgba(216, 165, 68, 0.1) 0 1px, transparent 1px 14px);
}
.media-frame--empty::after {
  content: attr(data-label);
  position: absolute;
  inset: 0;
  display: grid;
  place-content: center;
  padding: 12px;
  text-align: center;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: rgba(168, 191, 178, 0.8);
}

/* 标签页 */
.tabs {
  --tabs-line: rgba(21, 31, 28, 0.16);
  --tabs-text: rgba(21, 31, 28, 0.72);
  --tabs-active: var(--felt);
  --tabs-active-bg: rgba(47, 107, 87, 0.08);
}
.tabs--on-dark {
  --tabs-line: rgba(168, 191, 178, 0.28);
  --tabs-text: rgba(245, 242, 233, 0.72);
  --tabs-active: var(--gold-soft);
  --tabs-active-bg: rgba(216, 165, 68, 0.1);
}
.tabs__list {
  display: flex;
  flex-wrap: wrap;
  gap: 2px;
  border-bottom: 1px solid var(--tabs-line);
}
.tabs__tab {
  padding: 11px 16px;
  border-bottom: 2px solid transparent;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--tabs-text);
  transition: color 0.18s var(--ease), background 0.18s var(--ease),
              border-color 0.18s var(--ease);
}
.tabs__tab:hover { color: var(--tabs-active); background: var(--tabs-active-bg); }
.tabs__tab[aria-selected="true"] {
  color: var(--tabs-active);
  border-bottom-color: var(--gold);
  background: var(--tabs-active-bg);
}
.tabs__panel { padding-top: 22px; }

/* 折叠问答（原生 details） */
.accordion { border-top: 1px solid var(--line-ink); }
.accordion__item { border-bottom: 1px solid var(--line-ink); }
.accordion__summary {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 18px;
  padding: 20px 0;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-display);
  font-size: clamp(17px, 1.8vw, 20px);
  font-weight: 700;
  line-height: 1.4;
  color: var(--ink);
}
.accordion__summary::-webkit-details-marker { display: none; }
.accordion__summary::after {
  content: "";
  flex: 0 0 auto;
  width: 9px;
  height: 9px;
  margin-top: 8px;
  border-right: 1.5px solid var(--gold);
  border-bottom: 1.5px solid var(--gold);
  transform: rotate(45deg);
  transition: transform 0.22s var(--ease);
}
.accordion__item[open] .accordion__summary::after { transform: rotate(135deg); }
.accordion__body {
  padding-bottom: 22px;
  max-width: 66ch;
  color: rgba(21, 31, 28, 0.86);
}
.accordion--dark { border-top-color: rgba(168, 191, 178, 0.28); }
.accordion--dark .accordion__item { border-bottom-color: rgba(168, 191, 178, 0.28); }
.accordion--dark .accordion__summary { color: var(--paper); }
.accordion--dark .accordion__body { color: rgba(245, 242, 233, 0.82); }

/* 滚动显现 */
html.js [data-reveal] {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.55s var(--ease), transform 0.55s var(--ease);
}
html.js [data-reveal].is-visible { opacity: 1; transform: none; }

/* ---------- 11. 响应式 ---------- */
@media (max-width: 1120px) {
  .nav-toggle { display: inline-flex; }

  .primary-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    margin-left: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 16px var(--pad) 24px;
    max-height: calc(100vh - 76px);
    overflow-y: auto;
    background: var(--felt-deep);
    border-top: 1px solid var(--line-gold);
    box-shadow: 0 26px 40px -30px rgba(0, 0, 0, 0.95);
    visibility: hidden;
    opacity: 0;
    transform: translateY(-8px);
    pointer-events: none;
    transition: opacity 0.22s var(--ease), transform 0.22s var(--ease),
                visibility 0.22s var(--ease);
  }
  .site-header[data-nav-open="true"] .primary-nav {
    visibility: visible;
    opacity: 1;
    transform: none;
    pointer-events: auto;
  }

  .nav-list { flex-direction: column; align-items: stretch; gap: 0; }
  .nav-link {
    width: 100%;
    padding: 13px 4px;
    font-size: 17px;
    border-bottom: 1px solid rgba(168, 191, 178, 0.16);
  }
  .nav-link::after { display: none; }
  .nav-link[aria-current="page"] {
    color: var(--gold-soft);
    background: rgba(216, 165, 68, 0.07);
    padding-inline: 10px;
  }
  .nav-index { font-size: 12px; }

  .nav-actions {
    flex-direction: column;
    align-items: stretch;
    gap: 10px;
    margin-top: 16px;
    padding-top: 16px;
    border-top: 1px solid rgba(168, 191, 178, 0.18);
  }
  .notice-pill { align-self: flex-start; }
  .nav-actions .btn { width: 100%; padding-block: 12px; }
}

@media (max-width: 1024px) {
  .grid { grid-template-columns: repeat(6, minmax(0, 1fr)); }
  .col-4, .col-5, .col-6, .col-7, .col-8, .col-12 { grid-column: span 6; }
  .offset-1 { grid-column-start: auto; }
  .footer-top { grid-template-columns: 1fr; }
}

@media (max-width: 900px) {
  .side-rail { display: none; }
  html { scroll-padding-top: 88px; }
}

@media (max-width: 760px) {
  body { font-size: 16px; }
  .footer-nav { grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 18px; }
  .footer-fan { display: none; }
}

@media (max-width: 560px) {
  .header-inner { gap: 10px; padding-inline: 16px; }
  .brand-tagline { display: none; }
  .brand-name { font-size: 17px; }
  .nav-toggle-label { display: none; }
  .nav-toggle { padding: 9px 11px; }
  .footer-nav { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-bottom { flex-direction: column; align-items: flex-start; }
  .footer-legal { font-size: 11px; }
}

/* ---------- 12. 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;
  }
  html.js [data-reveal] { opacity: 1; transform: none; }
  .card:hover { transform: none; }
  .btn-gold:hover { transform: none; }
  .side-rail-link:hover { transform: none; }
}