/* ==========================================================
   K体育汇 / K体育官方品牌站 — 全站共享样式
   File: /assets/site.css
   Concept: 章回体 · 技术蓝图 · 古典体育档案
   ========================================================== */

/* ---------- 0. 变量 ---------- */
:root {
  --zh-bg-0: #080A0D;
  --zh-bg-1: #0E1116;
  --zh-bg-2: #161B22;
  --zh-bg-3: #1C222B;
  --zh-line-gold: #D4AF37;
  --zh-line-gold-dim: rgba(212, 175, 55, 0.4);
  --zh-line-gold-faint: rgba(212, 175, 55, 0.15);
  --zh-text-0: #F5F0E6;
  --zh-text-1: #BDB6A8;
  --zh-text-2: #6E675C;
  --zh-accent-gold: #E8C837;
  --zh-accent-red: #C0392B;
  --zh-accent-red-soft: #A93226;
  --zh-font-heading: 'Noto Serif SC', 'Source Han Serif SC', 'Songti SC', 'SimSun', serif;
  --zh-font-body: 'Noto Sans SC', 'Source Han Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --zh-font-data: 'JetBrains Mono', 'Fira Mono', 'Consolas', monospace;
  --zh-fs-h1: 36px;
  --zh-fs-h2: 28px;
  --zh-fs-h3: 22px;
  --zh-fs-body: 16px;
  --zh-fs-data: 14px;
  --zh-fs-micro: 12px;
  --zh-lh-heading: 1.2;
  --zh-lh-body: 1.6;
  --zh-space-xs: 4px;
  --zh-space-sm: 8px;
  --zh-space-md: 16px;
  --zh-space-lg: 24px;
  --zh-space-xl: 48px;
  --zh-space-xxl: 96px;
  --zh-content-max: 1200px;
  --zh-radius: 0;
  --zh-ease: cubic-bezier(0.22, 1, 0.36, 1);
}

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

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

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

body {
  min-height: 100vh;
  padding-top: 88px;
  font-family: var(--zh-font-body);
  font-size: var(--zh-fs-body);
  line-height: var(--zh-lh-body);
  color: var(--zh-text-0);
  background-color: var(--zh-bg-0);
  background-image:
    linear-gradient(rgba(212, 175, 55, 0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(212, 175, 55, 0.025) 1px, transparent 1px);
  background-size: 36px 36px;
  -webkit-font-smoothing: antialiased;
}

main {
  display: block;
  min-height: 70vh;
}

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

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

ul, ol {
  list-style: none;
}

a {
  color: var(--zh-line-gold);
  text-decoration: none;
  transition: color 0.15s ease;
}

a:hover {
  color: var(--zh-accent-gold);
  text-decoration: underline;
}

:focus-visible {
  outline: 2px solid var(--zh-accent-gold);
  outline-offset: 2px;
}

::selection {
  background: rgba(212, 175, 55, 0.25);
  color: var(--zh-text-0);
}

[id] {
  scroll-margin-top: 104px;
}

/* ---------- 2. 排版 ---------- */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--zh-font-heading);
  line-height: var(--zh-lh-heading);
  color: var(--zh-text-0);
  font-weight: 700;
  margin-bottom: var(--zh-space-sm);
}

h1 { font-size: var(--zh-fs-h1); }
h2 { font-size: var(--zh-fs-h2); }
h3 { font-size: var(--zh-fs-h3); }

p {
  margin-bottom: var(--zh-space-md);
}

.mono,
.zh-data,
code,
pre {
  font-family: var(--zh-font-data);
  font-size: var(--zh-fs-data);
}

.zh-micro {
  font-size: var(--zh-fs-micro);
}

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

/* ---------- 3. 布局系统 ---------- */
.zh-container {
  width: 100%;
  max-width: var(--zh-content-max);
  margin: 0 auto;
  padding: 0 var(--zh-space-lg);
}

.zh-section {
  padding: var(--zh-space-xl) 0;
}

.zh-grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: var(--zh-space-lg);
}

.zh-col-4  { grid-column: span 4; }
.zh-col-6  { grid-column: span 6; }
.zh-col-8  { grid-column: span 8; }
.zh-col-12 { grid-column: span 12; }

/* 面包屑 */
.zh-breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--zh-space-xs);
  font-family: var(--zh-font-data);
  font-size: var(--zh-fs-micro);
  color: var(--zh-text-2);
  margin-bottom: var(--zh-space-lg);
  padding-bottom: var(--zh-space-sm);
  border-bottom: 1px solid var(--zh-line-gold-faint);
}

.zh-breadcrumb a {
  color: var(--zh-text-1);
  text-decoration: none;
}

.zh-breadcrumb a:hover {
  color: var(--zh-accent-gold);
  text-decoration: none;
}

.zh-breadcrumb-item + .zh-breadcrumb-item::before {
  content: '/';
  margin-right: var(--zh-space-xs);
  color: var(--zh-text-2);
}

.zh-breadcrumb-current {
  color: var(--zh-text-0);
}

/* ---------- 4. 共享头部 ---------- */
.skip-link {
  position: fixed;
  top: -100px;
  left: var(--zh-space-md);
  z-index: 2000;
  display: inline-flex;
  align-items: center;
  padding: 10px 18px;
  background: var(--zh-bg-2);
  color: var(--zh-text-0) !important;
  border: 1px solid var(--zh-line-gold);
  border-radius: var(--zh-radius);
  font-size: var(--zh-fs-data);
  text-decoration: none;
  transition: top 0.2s ease;
}

.skip-link:hover {
  text-decoration: none;
}

.skip-link:focus,
.skip-link:focus-visible {
  top: var(--zh-space-md);
  text-decoration: none;
  outline: none;
  box-shadow: 0 0 0 2px rgba(8, 10, 13, 0.85), 0 0 0 4px var(--zh-accent-gold);
}

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: var(--zh-space-md) var(--zh-space-md) 0;
  pointer-events: none;
}

.capsule-outer {
  max-width: var(--zh-content-max);
  margin: 0 auto;
}

.nav-capsule {
  position: relative;
  display: flex;
  align-items: center;
  gap: var(--zh-space-md);
  padding: 8px 12px;
  background: rgba(14, 17, 22, 0.88);
  border: 1px solid var(--zh-line-gold-dim);
  border-radius: 48px;
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  pointer-events: auto;
  transition: padding 0.3s var(--zh-ease), background 0.3s var(--zh-ease), border-color 0.3s var(--zh-ease), box-shadow 0.3s var(--zh-ease);
}

.site-header.is-scrolled .nav-capsule {
  padding-top: 4px;
  padding-bottom: 4px;
  background: rgba(14, 17, 22, 0.96);
  border-color: var(--zh-line-gold);
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.38);
}

/* 品牌 */
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: inherit;
  text-decoration: none;
  flex-shrink: 0;
}

.brand:hover {
  text-decoration: none;
  color: inherit;
}

.brand-logo,
.footer-logo {
  flex-shrink: 0;
  color: var(--zh-line-gold);
}

.brand-logo {
  width: 40px;
  height: 40px;
}

.brand-logo-frame {
  fill: rgba(212, 175, 55, 0.08);
  stroke: currentColor;
  stroke-width: 1.5;
}

.brand-logo-k {
  fill: none;
  stroke: var(--zh-text-0);
  stroke-width: 2.5;
  stroke-linecap: square;
  stroke-linejoin: miter;
}

.brand-logo-seal {
  fill: var(--zh-accent-red);
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}

.brand-name {
  font-family: var(--zh-font-heading);
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--zh-text-0);
}

.brand-tagline {
  font-size: var(--zh-fs-micro);
  color: var(--zh-text-1);
  letter-spacing: 0.14em;
  white-space: nowrap;
}

/* 主导航 */
.site-nav {
  flex: 1;
  display: flex;
  justify-content: center;
  min-width: 0;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 2px;
}

.nav-item {
  position: relative;
}

.nav-link {
  display: inline-flex;
  align-items: center;
  padding: 8px 14px;
  font-size: 14px;
  letter-spacing: 0.06em;
  color: var(--zh-text-1);
  border-radius: 999px;
  border: 1px solid transparent;
  text-decoration: none;
  transition: color 0.2s ease, background 0.2s ease, border-color 0.2s ease;
}

.nav-link:hover {
  color: var(--zh-text-0);
  background: rgba(212, 175, 55, 0.08);
  text-decoration: none;
}

.nav-link[aria-current="page"] {
  color: var(--zh-bg-0);
  background: var(--zh-line-gold);
  border-color: var(--zh-line-gold);
  font-weight: 600;
}

/* 刷新倒计时 */
.refresh-count {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  justify-content: center;
  padding: 2px 6px 2px 14px;
  border-left: 1px solid var(--zh-line-gold-dim);
  margin-left: auto;
  flex-shrink: 0;
  min-width: 88px;
}

.refresh-label {
  font-size: 10px;
  color: var(--zh-text-2);
  letter-spacing: 0.18em;
  line-height: 1.2;
}

.refresh-value {
  font-family: var(--zh-font-data);
  font-size: 15px;
  color: var(--zh-line-gold);
  letter-spacing: 0.04em;
  line-height: 1.3;
}

.refresh-value.is-tick {
  animation: zh-tick 0.4s ease;
}

@keyframes zh-tick {
  0%   { opacity: 0.4; transform: translateY(1px); }
  100% { opacity: 1;   transform: translateY(0); }
}

/* 移动导航按钮 */
.nav-toggle {
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  border-radius: 999px;
  border: 1px solid var(--zh-line-gold-dim);
  background: transparent;
  flex-shrink: 0;
  transition: border-color 0.2s ease, background 0.2s ease;
}

.nav-toggle:hover,
.nav-toggle[aria-expanded="true"] {
  border-color: var(--zh-line-gold);
  background: rgba(212, 175, 55, 0.08);
}

.nav-toggle-line {
  display: block;
  width: 16px;
  height: 1.5px;
  background: var(--zh-text-0);
  transition: transform 0.25s var(--zh-ease), opacity 0.2s ease;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-line:nth-child(1) {
  transform: translateY(6.5px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-line:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-line:nth-child(3) {
  transform: translateY(-6.5px) rotate(-45deg);
}

/* 滚动进度条 */
.scroll-progress {
  position: absolute;
  top: 0;
  left: 0;
  height: 2px;
  width: 0;
  background: linear-gradient(90deg, var(--zh-accent-red) 0%, var(--zh-accent-gold) 70%, var(--zh-line-gold) 100%);
  pointer-events: none;
  z-index: 2;
}

/* ---------- 5. 共享页脚 ---------- */
.site-footer {
  position: relative;
  background: var(--zh-bg-1);
  border-top: 1px solid var(--zh-line-gold);
  margin-top: var(--zh-space-xxl);
}

.footer-frame {
  max-width: var(--zh-content-max);
  margin: 0 auto;
  padding: var(--zh-space-xl) var(--zh-space-lg) var(--zh-space-lg);
}

.footer-top {
  display: grid;
  grid-template-columns: 5fr 2.5fr 4fr;
  gap: var(--zh-space-xl);
  padding-bottom: var(--zh-space-xl);
}

.footer-brand-col,
.footer-links-col,
.footer-contact-col {
  min-width: 0;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: var(--zh-space-md);
}

.footer-logo {
  width: 46px;
  height: 46px;
}

.footer-logo .brand-logo-frame {
  fill: rgba(212, 175, 55, 0.05);
}

.footer-brand-text {
  display: flex;
  flex-direction: column;
}

.footer-brand-name {
  font-family: var(--zh-font-heading);
  font-size: 20px;
  font-weight: 700;
  color: var(--zh-text-0);
  line-height: 1.2;
  margin-bottom: 0;
}

.footer-brand-org {
  font-size: var(--zh-fs-micro);
  color: var(--zh-text-2);
  letter-spacing: 0.12em;
  margin-top: 2px;
}

.footer-tagline {
  font-family: var(--zh-font-heading);
  font-size: var(--zh-fs-data);
  color: var(--zh-line-gold);
  letter-spacing: 0.08em;
  margin-bottom: var(--zh-space-sm);
}

.footer-trust {
  font-size: var(--zh-fs-data);
  color: var(--zh-text-1);
  line-height: 1.8;
  max-width: 44ch;
  margin-bottom: 0;
}

.footer-heading {
  font-family: var(--zh-font-body);
  font-size: var(--zh-fs-micro);
  font-weight: 600;
  letter-spacing: 0.22em;
  color: var(--zh-accent-red);
  margin-bottom: var(--zh-space-md);
  padding-bottom: var(--zh-space-xs);
  border-bottom: 1px solid var(--zh-line-gold-dim);
}

.footer-links li {
  margin-bottom: 10px;
}

.footer-link {
  font-size: var(--zh-fs-data);
  color: var(--zh-text-1);
  text-decoration: none;
  display: inline-block;
  transition: color 0.2s ease, transform 0.2s ease;
}

.footer-link:hover {
  color: var(--zh-accent-gold);
  text-decoration: none;
  transform: translateX(3px);
}

.footer-contact-list {
  display: grid;
  gap: var(--zh-space-sm);
}

.footer-contact-item {
  display: flex;
  flex-direction: column;
  padding-left: 12px;
  border-left: 2px solid rgba(212, 175, 55, 0.3);
}

.footer-contact-label {
  font-size: 11px;
  color: var(--zh-text-2);
  letter-spacing: 0.14em;
  margin-bottom: 2px;
}

.footer-contact-value {
  font-size: var(--zh-fs-data);
  color: var(--zh-text-1);
  font-family: var(--zh-font-data);
  line-height: 1.5;
  word-break: break-all;
}

.footer-rule {
  position: relative;
  height: 1px;
  border: none;
  background: linear-gradient(90deg, transparent 0%, var(--zh-line-gold-dim) 20%, var(--zh-line-gold-dim) 80%, transparent 100%);
}

.footer-rule-mark {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--zh-font-heading);
  font-size: 14px;
  color: var(--zh-line-gold);
  background: var(--zh-bg-1);
}

.footer-rule-mark::before {
  content: '';
  position: absolute;
  inset: 3px;
  border: 1px solid var(--zh-line-gold-dim);
  transform: rotate(45deg);
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--zh-space-sm);
  padding-top: var(--zh-space-lg);
}

.footer-copyright,
.footer-icp {
  font-size: var(--zh-fs-micro);
  color: var(--zh-text-2);
  letter-spacing: 0.04em;
  margin: 0;
}

.footer-seal {
  position: absolute;
  right: 48px;
  bottom: 24px;
  width: 96px;
  height: 96px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--zh-font-heading);
  font-size: 52px;
  font-weight: 700;
  color: rgba(212, 175, 55, 0.06);
  border: 2px solid rgba(212, 175, 55, 0.08);
  transform: rotate(-12deg);
  pointer-events: none;
  z-index: 0;
}

/* 返回顶部 */
.back-top {
  position: fixed;
  right: var(--zh-space-lg);
  bottom: var(--zh-space-lg);
  z-index: 900;
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--zh-bg-2);
  border: 1px solid var(--zh-line-gold-dim);
  border-radius: var(--zh-radius);
  color: var(--zh-line-gold);
  font-size: 18px;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px) rotate(-3deg);
  transition: opacity 0.25s var(--zh-ease), visibility 0.25s, transform 0.25s var(--zh-ease), border-color 0.2s ease, background 0.2s ease;
}

.back-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0) rotate(0);
}

.back-top:hover,
.back-top:focus-visible {
  border-color: var(--zh-line-gold);
  color: var(--zh-accent-gold);
  background: var(--zh-bg-3);
}

/* ---------- 6. 章回排版组件 ---------- */
.zh-chapter {
  position: relative;
  margin-bottom: var(--zh-space-lg);
}

.zh-chapter-meta {
  display: block;
  font-family: var(--zh-font-data);
  font-size: var(--zh-fs-micro);
  letter-spacing: 0.24em;
  color: var(--zh-accent-red);
  margin-bottom: 8px;
  text-transform: uppercase;
}

.zh-chapter-title {
  font-family: var(--zh-font-heading);
  font-size: var(--zh-fs-h2);
  line-height: var(--zh-lh-heading);
  margin-bottom: 0;
}

.zh-chapter-rule {
  margin-top: var(--zh-space-sm);
  border: none;
  height: 1px;
  background: linear-gradient(90deg, var(--zh-line-gold) 0%, var(--zh-line-gold-faint) 55%, transparent 100%);
}

.zh-divider {
  display: flex;
  align-items: center;
  gap: var(--zh-space-md);
  margin: var(--zh-space-xl) 0;
}

.zh-divider::before,
.zh-divider::after {
  content: '';
  flex: 1;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--zh-line-gold-dim) 50%, transparent);
}

.zh-divider-mark {
  width: 42px;
  height: 14px;
  border-top: 1px solid var(--zh-line-gold);
  border-bottom: 1px solid var(--zh-line-gold);
  position: relative;
}

.zh-divider-mark::after {
  content: '';
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  width: 6px;
  height: 6px;
  border: 1px solid var(--zh-line-gold);
  background: var(--zh-bg-0);
}

.zh-next-chapter {
  margin-top: var(--zh-space-xl);
  padding: var(--zh-space-lg) var(--zh-space-xl);
  border: 1px solid var(--zh-line-gold-dim);
  border-radius: var(--zh-radius);
  background: linear-gradient(135deg, rgba(212, 175, 55, 0.06), transparent 55%);
  position: relative;
}

.zh-next-chapter-label {
  display: block;
  font-family: var(--zh-font-data);
  font-size: var(--zh-fs-micro);
  letter-spacing: 0.2em;
  color: var(--zh-accent-red);
  margin-bottom: var(--zh-space-xs);
}

.zh-next-chapter-title {
  font-family: var(--zh-font-heading);
  font-size: 20px;
  color: var(--zh-text-0);
  margin-bottom: 0;
}

/* ---------- 7. 资料档案组件 ---------- */
.zh-card {
  background: var(--zh-bg-1);
  border: 1px solid var(--zh-line-gold-dim);
  border-radius: var(--zh-radius);
  position: relative;
  transition: border-color 0.25s ease, background 0.25s ease;
}

.zh-card:hover {
  border-color: var(--zh-line-gold);
  background: var(--zh-bg-2);
}

.zh-card-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--zh-space-sm);
  padding: 14px 18px;
  border-bottom: 1px solid var(--zh-line-gold-faint);
}

.zh-card-title {
  font-family: var(--zh-font-heading);
  font-size: 17px;
  color: var(--zh-text-0);
  margin-bottom: 0;
}

.zh-card-body {
  padding: 18px;
  color: var(--zh-text-1);
  font-size: var(--zh-fs-data);
}

.zh-frame {
  position: relative;
  border: 1px solid var(--zh-line-gold-dim);
  border-radius: var(--zh-radius);
  background: var(--zh-bg-1);
  padding: 28px;
}

.zh-corner {
  position: absolute;
  width: 18px;
  height: 18px;
  pointer-events: none;
  z-index: 1;
}

.zh-corner--tl {
  top: -1px;
  left: -1px;
  border-top: 2px solid var(--zh-line-gold);
  border-left: 2px solid var(--zh-line-gold);
}

.zh-corner--tr {
  top: -1px;
  right: -1px;
  border-top: 2px solid var(--zh-line-gold);
  border-right: 2px solid var(--zh-line-gold);
}

.zh-corner--bl {
  bottom: -1px;
  left: -1px;
  border-bottom: 2px solid var(--zh-line-gold);
  border-left: 2px solid var(--zh-line-gold);
}

.zh-corner--br {
  bottom: -1px;
  right: -1px;
  border-bottom: 2px solid var(--zh-line-gold);
  border-right: 2px solid var(--zh-line-gold);
}

/* 数据表 */
.zh-data-table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--zh-font-data);
  font-size: var(--zh-fs-data);
}

.zh-data-table th {
  font-family: var(--zh-font-body);
  font-size: var(--zh-fs-micro);
  font-weight: 600;
  letter-spacing: 0.14em;
  text-align: left;
  color: var(--zh-text-2);
  padding: 10px 12px;
  border-bottom: 1px solid var(--zh-line-gold-dim);
}

.zh-data-table td {
  padding: 12px;
  color: var(--zh-text-1);
  border-bottom: 1px solid var(--zh-line-gold-faint);
}

.zh-data-table tbody tr:last-child td {
  border-bottom: none;
}

.zh-data-table tbody tr:hover td {
  background: rgba(212, 175, 55, 0.04);
  color: var(--zh-text-0);
}

.zh-strong {
  color: var(--zh-accent-gold) !important;
  font-weight: 600;
}

.zh-danger {
  color: var(--zh-accent-red) !important;
}

/* 标签 */
.zh-tag {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 3px 10px;
  font-size: var(--zh-fs-micro);
  letter-spacing: 0.08em;
  line-height: 1.4;
  color: var(--zh-text-1);
  border: 1px solid var(--zh-line-gold-dim);
  border-radius: var(--zh-radius);
  background: transparent;
}

.zh-tag-gold {
  color: var(--zh-accent-gold);
  border-color: var(--zh-line-gold);
  background: rgba(212, 175, 55, 0.06);
}

.zh-tag-red {
  color: var(--zh-accent-red);
  border-color: var(--zh-accent-red);
  background: rgba(192, 57, 43, 0.08);
}

/* ---------- 8. 按钮与交互 ---------- */
.zh-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 22px;
  font-family: var(--zh-font-body);
  font-size: var(--zh-fs-data);
  letter-spacing: 0.08em;
  color: var(--zh-text-0);
  background: transparent;
  border: 1px solid var(--zh-line-gold-dim);
  border-radius: var(--zh-radius);
  cursor: pointer;
  text-decoration: none;
  transition: background 0.2s ease, border-color 0.2s ease, color 0.2s ease;
}

.zh-btn:hover {
  text-decoration: none;
  border-color: var(--zh-line-gold);
  color: var(--zh-accent-gold);
  background: rgba(212, 175, 55, 0.06);
}

.zh-btn-gold {
  background: var(--zh-line-gold);
  border-color: var(--zh-line-gold);
  color: var(--zh-bg-0);
  font-weight: 600;
}

.zh-btn-gold:hover {
  background: var(--zh-accent-gold);
  border-color: var(--zh-accent-gold);
  color: var(--zh-bg-0);
}

.zh-btn-outline {
  border-color: var(--zh-line-gold-dim);
  color: var(--zh-line-gold);
}

/* 可展开问答 */
.zh-acc {
  border-bottom: 1px solid var(--zh-line-gold-faint);
}

.zh-acc:last-child {
  border-bottom: none;
}

.zh-acc summary {
  cursor: pointer;
  padding: 16px 18px;
  font-family: var(--zh-font-heading);
  font-size: 16px;
  color: var(--zh-text-0);
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--zh-space-md);
  transition: color 0.2s ease, background 0.2s ease;
}

.zh-acc summary::-webkit-details-marker {
  display: none;
}

.zh-acc summary:hover {
  color: var(--zh-accent-gold);
  background: rgba(212, 175, 55, 0.03);
}

.zh-acc summary::after {
  content: '+';
  font-family: var(--zh-font-data);
  font-size: 18px;
  color: var(--zh-line-gold);
  transition: transform 0.3s var(--zh-ease);
}

.zh-acc[open] summary::after {
  transform: rotate(45deg);
}

.zh-acc-body {
  padding: 0 18px 16px;
  color: var(--zh-text-1);
  font-size: var(--zh-fs-data);
  line-height: 1.8;
}

/* 章节目录高亮 */
[data-chapter-nav] [data-chapter-target].is-active {
  color: var(--zh-accent-gold);
  border-color: var(--zh-line-gold);
  background: rgba(212, 175, 55, 0.06);
}

/* ---------- 9. 图片容器 ---------- */
.zh-media {
  position: relative;
  background: var(--zh-bg-1);
  border: 1px solid var(--zh-line-gold-dim);
  border-radius: var(--zh-radius);
  overflow: hidden;
}

.zh-media::before {
  content: '';
  display: block;
  padding-top: 62.5%;
}

.zh-media--wide::before {
  padding-top: 56.25%;
}

.zh-media--portrait::before {
  padding-top: 125%;
}

.zh-media img,
.zh-media-content {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.zh-media::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(212, 175, 55, 0.08), transparent 45%);
  pointer-events: none;
}

/* ---------- 10. 滚动显现 ---------- */
html.js [data-reveal] {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.55s var(--zh-ease), transform 0.55s var(--zh-ease);
}

html.js [data-reveal].is-revealed {
  opacity: 1;
  transform: none;
}

/* ---------- 11. 响应式 ---------- */
@media (max-width: 960px) {
  .nav-toggle {
    display: flex;
  }

  .site-nav {
    position: absolute;
    top: calc(100% + 10px);
    left: -13px;
    right: -13px;
    z-index: 50;
    display: block;
    background: var(--zh-bg-2);
    border: 1px solid var(--zh-line-gold-dim);
    border-radius: var(--zh-radius);
    padding: var(--zh-space-sm);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: opacity 0.25s var(--zh-ease), transform 0.25s var(--zh-ease), visibility 0.25s;
    box-shadow: 0 16px 40px rgba(0, 0, 0, 0.45);
    max-height: calc(100vh - 120px);
    overflow-y: auto;
  }

  .site-nav[data-open] {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }

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

  .nav-link {
    width: 100%;
    justify-content: flex-start;
    border-radius: var(--zh-radius);
    padding: 12px 14px;
    font-size: 15px;
    border: 1px solid transparent;
  }

  .nav-link[aria-current="page"] {
    background: rgba(212, 175, 55, 0.1);
    border-color: var(--zh-line-gold-dim);
    color: var(--zh-accent-gold);
    font-weight: 600;
  }

  .zh-col-4,
  .zh-col-8 {
    grid-column: span 6;
  }

  .footer-top {
    grid-template-columns: 1fr 1fr;
    gap: var(--zh-space-lg);
  }

  .footer-brand-col {
    grid-column: span 2;
  }
}

@media (max-width: 768px) {
  .footer-seal {
    display: none;
  }
}

@media (max-width: 640px) {
  .brand-tagline {
    display: none;
  }

  .refresh-label {
    display: none;
  }

  .refresh-count {
    min-width: auto;
    padding: 2px 6px;
  }

  .site-header {
    padding: var(--zh-space-sm);
  }

  .zh-grid {
    grid-template-columns: 1fr;
    gap: var(--zh-space-md);
  }

  .zh-col-4,
  .zh-col-6,
  .zh-col-8,
  .zh-col-12 {
    grid-column: span 1;
  }

  .footer-top {
    grid-template-columns: 1fr;
  }

  .footer-brand-col {
    grid-column: span 1;
  }

  .footer-frame {
    padding: var(--zh-space-lg) var(--zh-space-md) var(--zh-space-md);
  }

  .footer-bottom {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }

  .back-top {
    right: var(--zh-space-md);
    bottom: var(--zh-space-md);
  }
}

@media (max-width: 480px) {
  .brand-logo {
    width: 34px;
    height: 34px;
  }

  .brand-name {
    font-size: 16px;
  }

  .refresh-value {
    font-size: 13px;
  }
}

/* ---------- 12. 减少动效 ---------- */
@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: 0s !important;
  }

  .back-top {
    transform: none;
  }

  .nav-toggle-line {
    transition: none;
  }

  html.js [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }
}