/* =============================================
   环亚体育 · 全站共享层 /assets/site.css
   视觉逻辑：技术蓝图网格 × 编辑部章节号 × 赛场斜切
   ============================================= */

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

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

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--neutral-800);
  background-color: var(--neutral-100);
  background-image:
    linear-gradient(rgba(11, 59, 46, .04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(11, 59, 46, .04) 1px, transparent 1px);
  background-size: 44px 44px;
  background-position: -1px -1px;
}

body, h1, h2, h3, h4, p, ul, ol, dl, figure, blockquote, hr { margin: 0; }
ul, ol { padding: 0; }

h1, h2, h3, h4 {
  font-family: var(--font-heading);
  font-weight: 800;
  line-height: 1.18;
  text-wrap: balance;
}

img { max-width: 100%; height: auto; display: block; }
a { color: var(--primary-500); text-decoration: none; transition: color .25s ease; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }

:focus-visible {
  outline: 2px dashed var(--secondary-500);
  outline-offset: 3px;
}

::selection {
  background: var(--secondary-500);
  color: var(--primary-900);
}

::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: var(--neutral-100); }
::-webkit-scrollbar-thumb { background: var(--primary-700); border: 2px solid var(--neutral-100); }

/* ---------- 2. 设计变量 ---------- */
:root {
  --primary-900: #0B3B2E;
  --primary-700: #0F5C4A;
  --primary-500: #2A7F62;
  --secondary-500: #D4A72C;
  --secondary-300: #E6C84F;
  --accent-600: #A63A2B;
  --neutral-100: #F5F2E9;
  --neutral-800: #1A1A1A;
  --neutral-500: #666666;
  --white: #FFFFFF;

  --font-heading: "Roboto Condensed", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Source Sans Pro", "Noto Sans SC", "Microsoft YaHei", sans-serif;
  --font-accent: "Courier New", "SFMono-Regular", Consolas, monospace;

  --header-height: 76px;
  --container-w: 1240px;
  --ease-out: cubic-bezier(.25, .46, .45, .94);
}

/* ---------- 3. 辅助类 ---------- */
.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;
}

.container {
  max-width: var(--container-w);
  margin-inline: auto;
  padding-inline: clamp(16px, 4vw, 32px);
}

#main-content { scroll-margin-top: calc(var(--header-height) + 8px); }

/* ---------- 4. 跳转链接 ---------- */
.skip-link {
  position: fixed;
  top: -100px;
  left: 16px;
  z-index: 200;
  display: inline-block;
  padding: 10px 16px;
  background: var(--secondary-500);
  color: var(--primary-900);
  font-weight: 700;
  font-size: .9rem;
  border-radius: 2px;
  transition: top .3s ease;
}

.skip-link:focus-visible { top: 12px; }

/* ---------- 5. 头部 ---------- */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 110;
  height: var(--header-height);
  background: var(--primary-900);
  border-bottom: 1px solid rgba(212, 167, 44, .28);
  transition: background-color .35s ease, border-color .35s ease, height .3s ease, box-shadow .3s ease;
}

body:not(.has-cover) .site-header {
  background:
    repeating-linear-gradient(90deg, rgba(255, 255, 255, .03) 0 1px, transparent 1px 88px),
    repeating-linear-gradient(0deg, rgba(255, 255, 255, .02) 0 1px, transparent 1px 88px),
    var(--primary-900);
}

body.has-cover .site-header {
  background: transparent;
  border-bottom-color: transparent;
}

.site-header.is-scrolled {
  height: calc(var(--header-height) - 12px);
  box-shadow: 0 6px 24px rgba(11, 59, 46, .22);
}

body.has-cover .site-header.is-scrolled {
  background:
    repeating-linear-gradient(90deg, rgba(255, 255, 255, .03) 0 1px, transparent 1px 88px),
    repeating-linear-gradient(0deg, rgba(255, 255, 255, .02) 0 1px, transparent 1px 88px),
    var(--primary-900);
  border-bottom-color: rgba(212, 167, 44, .3);
}

.site-header__inner {
  position: relative;
  height: 100%;
  max-width: var(--container-w);
  margin-inline: auto;
  padding-inline: clamp(16px, 4vw, 32px);
  display: flex;
  align-items: center;
  gap: 28px;
}

.scroll-progress {
  position: absolute;
  left: 0; bottom: -1px;
  width: 0;
  height: 3px;
  z-index: 2;
  background: linear-gradient(90deg, var(--secondary-500), var(--secondary-300));
  box-shadow: 0 0 8px rgba(212, 167, 44, .6);
  pointer-events: none;
}

.site-brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
  color: var(--white);
}

.site-brand__name,
.site-footer__logo {
  font-family: var(--font-heading);
  font-size: clamp(1.3rem, 2.4vw, 1.58rem);
  font-weight: 900;
  letter-spacing: .05em;
  line-height: 1;
}

.site-brand__accent,
.site-footer__accent { color: var(--secondary-500); }

.site-brand__tag {
  font-family: var(--font-accent);
  font-size: .62rem;
  letter-spacing: .24em;
  color: rgba(255, 255, 255, .55);
  border-left: 1px solid rgba(212, 167, 44, .45);
  padding-left: 10px;
  white-space: nowrap;
  text-transform: uppercase;
}

/* ---------- 6. 导航 ---------- */
.site-nav {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: clamp(8px, 1.6vw, 20px);
}

.site-nav__list {
  display: flex;
  align-items: center;
  gap: 2px;
  list-style: none;
}

.site-nav__link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 10px;
  color: rgba(255, 255, 255, .82);
  font-size: .88rem;
  font-weight: 600;
  letter-spacing: .06em;
  border-bottom: 2px solid transparent;
  transition: color .3s ease, border-color .3s ease, background-color .3s ease;
}

.site-nav__link:hover {
  color: var(--white);
  border-bottom-color: rgba(212, 167, 44, .6);
}

.site-nav__link[aria-current="page"] {
  color: var(--secondary-300);
  border-bottom-color: var(--secondary-500);
}

.site-nav__index {
  font-family: var(--font-accent);
  font-size: .64rem;
  color: var(--secondary-500);
  letter-spacing: .04em;
}

.site-nav__cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 20px;
  background: var(--accent-600);
  color: var(--white);
  font-size: .84rem;
  font-weight: 700;
  letter-spacing: .1em;
  white-space: nowrap;
  clip-path: polygon(10px 0, 100% 0, calc(100% - 10px) 100%, 0 100%);
  transition: background-color .3s ease, color .3s ease;
}

.site-nav__cta::before {
  content: "";
  width: 7px;
  height: 7px;
  flex: 0 0 auto;
  background: var(--secondary-300);
  transform: rotate(45deg);
}

.site-nav__cta:hover {
  background: var(--secondary-500);
  color: var(--primary-900);
}

/* ---------- 7. 移动导航 ---------- */
.mobile-toggle {
  display: none;
  position: relative;
  z-index: 5;
  width: 44px;
  height: 44px;
  flex: 0 0 auto;
}

.mobile-toggle__bar {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--white);
  margin: 5px auto;
  transition: transform .35s var(--ease-out), opacity .25s ease;
}

.mobile-toggle[aria-expanded="true"] .mobile-toggle__bar:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.mobile-toggle[aria-expanded="true"] .mobile-toggle__bar:nth-child(2) { opacity: 0; }
.mobile-toggle[aria-expanded="true"] .mobile-toggle__bar:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

body.nav-open::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 105;
  background: rgba(11, 59, 46, .52);
  pointer-events: none;
}

body.nav-open { overflow: hidden; }

@media (max-width: 980px) {
  :root { --header-height: 64px; }

  .mobile-toggle {
    display: block;
    margin-left: auto;
  }

  .site-nav {
    position: fixed;
    top: 0; right: 0; bottom: 0;
    z-index: 4;
    width: min(86vw, 420px);
    flex: initial;
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    gap: 6px;
    margin: 0;
    padding: calc(var(--header-height) + 18px) 26px 40px;
    background:
      repeating-linear-gradient(90deg, rgba(255, 255, 255, .03) 0 1px, transparent 1px 54px),
      var(--primary-900);
    border-left: 1px solid rgba(212, 167, 44, .4);
    box-shadow: -18px 0 40px rgba(0, 0, 0, .35);
    transform: translateX(105%);
    visibility: hidden;
    transition: transform .4s var(--ease-out), visibility .4s;
    overflow-y: auto;
  }

  .site-nav[data-open="true"] {
    transform: translateX(0);
    visibility: visible;
  }

  .site-nav__list {
    flex-direction: column;
    align-items: stretch;
    width: 100%;
    margin-bottom: 20px;
  }

  .site-nav__item { border-bottom: 1px solid rgba(255, 255, 255, .08); }

  .site-nav__link {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 14px 6px;
    font-size: 1.06rem;
    border: 0;
    border-left: 3px solid transparent;
  }

  .site-nav__link:hover,
  .site-nav__link[aria-current="page"] {
    color: var(--secondary-300);
    border-left-color: var(--secondary-500);
    background: rgba(212, 167, 44, .08);
  }

  .site-nav__index { font-size: .7rem; }
  .site-nav__cta { align-self: flex-start; margin: 4px 0 0; }
}

/* ---------- 8. 返回顶部 ---------- */
.back-top {
  position: fixed;
  right: 24px;
  bottom: 24px;
  z-index: 3;
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  width: 52px;
  height: 52px;
  padding: 0;
  color: var(--secondary-300);
  background: var(--primary-700);
  border: 1px solid rgba(212, 167, 44, .55);
  box-shadow: 4px 4px 0 rgba(11, 59, 46, .3);
  clip-path: polygon(8px 0, 100% 0, calc(100% - 8px) 100%, 0 100%);
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: opacity .3s ease, transform .3s var(--ease-out), visibility .3s, background-color .3s;
}

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

.back-top:hover { background: var(--secondary-500); color: var(--primary-900); }
.back-top__icon { font-size: 1.05rem; line-height: 1; font-weight: 700; }
.back-top__text { font-family: var(--font-accent); font-size: .56rem; letter-spacing: .18em; }

/* ---------- 9. 页脚 ---------- */
.site-footer {
  position: relative;
  color: rgba(255, 255, 255, .78);
  background:
    radial-gradient(circle at 12% 0%, rgba(212, 167, 44, .12), transparent 42%),
    repeating-linear-gradient(90deg, rgba(255, 255, 255, .025) 0 1px, transparent 1px 80px),
    repeating-linear-gradient(0deg, rgba(255, 255, 255, .02) 0 1px, transparent 1px 80px),
    var(--primary-900);
}

.site-footer::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--secondary-500) 0%, var(--secondary-500) 55%, var(--accent-600) 55%, var(--accent-600) 100%);
}

.site-footer__inner {
  position: relative;
  max-width: var(--container-w);
  margin-inline: auto;
  padding: 56px clamp(16px, 4vw, 32px) 40px;
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
  gap: 40px;
}

.site-footer__inner::after {
  content: "+";
  position: absolute;
  top: 18px;
  right: clamp(16px, 3vw, 40px);
  font-family: var(--font-accent);
  font-size: 20px;
  line-height: 1;
  color: rgba(212, 167, 44, .35);
  pointer-events: none;
}

.site-footer__logo {
  display: inline-block;
  color: var(--white);
}

.site-footer__logo:hover { color: var(--secondary-300); }

.site-footer__slogan {
  margin-top: 10px;
  font-size: .86rem;
  letter-spacing: .2em;
  color: var(--secondary-300);
}

.site-footer__slogan::before {
  content: "◆";
  color: var(--secondary-500);
  margin-right: 8px;
  font-size: .6rem;
  vertical-align: middle;
}

.site-footer__note {
  margin-top: 16px;
  font-size: .85rem;
  line-height: 1.7;
  color: rgba(255, 255, 255, .6);
  border-left: 2px solid var(--secondary-500);
  padding-left: 12px;
}

.site-footer__coords {
  display: block;
  margin-top: 16px;
  font-family: var(--font-accent);
  font-size: .64rem;
  letter-spacing: .22em;
  color: rgba(212, 167, 44, .45);
}

.site-footer__title {
  font-family: var(--font-accent);
  font-size: .76rem;
  font-weight: 700;
  letter-spacing: .24em;
  text-transform: uppercase;
  color: var(--secondary-500);
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid rgba(212, 167, 44, .25);
}

.site-footer__list {
  list-style: none;
  display: grid;
  gap: 10px;
  font-size: .9rem;
}

.site-footer__list a {
  color: rgba(255, 255, 255, .78);
  transition: color .3s ease, padding-left .3s ease;
}

.site-footer__list a:hover {
  color: var(--secondary-300);
  padding-left: 4px;
}

.site-footer__list li { color: rgba(255, 255, 255, .7); }

.site-footer__contact {
  background: rgba(212, 167, 44, .08);
  border: 1px solid rgba(212, 167, 44, .25);
  padding: 20px;
}

.site-footer__list--contact li {
  position: relative;
  padding-left: 18px;
  word-break: break-all;
}

.site-footer__list--contact li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .55em;
  width: 8px;
  height: 8px;
  background: var(--secondary-500);
  clip-path: polygon(50% 0, 100% 50%, 50% 100%, 0 50%);
}

.site-footer__bottom {
  max-width: var(--container-w);
  margin-inline: auto;
  padding: 20px clamp(16px, 4vw, 32px) 28px;
  border-top: 1px solid rgba(255, 255, 255, .1);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px 24px;
  font-family: var(--font-accent);
  font-size: .7rem;
  letter-spacing: .06em;
  color: rgba(255, 255, 255, .45);
}

@media (max-width: 980px) {
  .site-footer__inner { grid-template-columns: 1fr 1fr; row-gap: 40px; }
  .site-footer__inner::after { display: none; }
}

@media (max-width: 560px) {
  .site-footer__inner { grid-template-columns: 1fr; gap: 36px; }
  .site-footer__bottom { flex-direction: column; align-items: flex-start; }
  .back-top { right: 14px; bottom: 14px; width: 42px; height: 42px; }
}

/* ---------- 10. 章节与版面 ---------- */
.section { padding: clamp(56px, 9vw, 96px) 0; }
.section--paper { background: var(--neutral-100); }

.section--deep {
  color: var(--white);
  background:
    radial-gradient(circle at 18% 0%, rgba(212, 167, 44, .14), transparent 42%),
    repeating-linear-gradient(90deg, rgba(255, 255, 255, .03) 0 1px, transparent 1px 88px),
    repeating-linear-gradient(0deg, rgba(255, 255, 255, .02) 0 1px, transparent 1px 88px),
    var(--primary-900);
}

.section__lead {
  max-width: 680px;
  margin-bottom: 36px;
  font-size: 1.06rem;
  line-height: 1.75;
}

.section-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px 20px;
  margin-bottom: 32px;
  padding-bottom: 14px;
  border-bottom: 1px solid rgba(11, 59, 46, .16);
}

.section-head__title {
  display: inline;
  font-family: var(--font-heading);
  font-size: clamp(1.5rem, 3vw, 2.2rem);
  font-weight: 900;
  color: var(--primary-900);
  line-height: 1.12;
}

.section-head__title::before {
  content: attr(data-num);
  font-family: var(--font-accent);
  font-size: 1rem;
  font-weight: 700;
  color: var(--secondary-500);
  margin-right: 14px;
  vertical-align: middle;
}

.section-head__meta {
  font-size: .82rem;
  color: var(--neutral-500);
  letter-spacing: .08em;
  text-transform: uppercase;
  white-space: nowrap;
}

.section-head--light { border-bottom-color: rgba(255, 255, 255, .18); }
.section-head--light .section-head__title { color: var(--white); }
.section-head--light .section-head__meta { color: rgba(255, 255, 255, .55); }

/* ---------- 11. 栅格 ---------- */
.grid {
  display: grid;
  gap: 24px;
}

.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)); }

@media (max-width: 980px) {
  .grid--3, .grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 620px) {
  .grid--2, .grid--3, .grid--4 { grid-template-columns: minmax(0, 1fr); }
}

/* ---------- 12. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 12px 22px;
  border: 1px solid transparent;
  font-weight: 700;
  font-size: .92rem;
  letter-spacing: .08em;
  text-align: center;
  cursor: pointer;
  transition: background-color .3s ease, color .3s ease, border-color .3s ease;
}

.btn--gold { background: var(--secondary-500); color: var(--primary-900); }
.btn--gold:hover { background: var(--secondary-300); color: var(--primary-900); }

.btn--accent { background: var(--accent-600); color: var(--white); }
.btn--accent:hover { background: #8C2F21; color: var(--white); }

.btn--outline {
  background: transparent;
  border-color: rgba(11, 59, 46, .4);
  color: var(--primary-700);
}

.btn--outline:hover {
  border-color: var(--primary-700);
  background: rgba(11, 59, 46, .06);
}

.btn--ghost {
  background: transparent;
  border-color: rgba(255, 255, 255, .5);
  color: var(--white);
}

.btn--ghost:hover { background: rgba(255, 255, 255, .12); border-color: var(--white); }

.btn--skew { clip-path: polygon(12px 0, 100% 0, calc(100% - 12px) 100%, 0 100%); }
.btn--block { display: flex; width: 100%; }

/* ---------- 13. 标签 ---------- */
.tag, .chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 12px;
  font-size: .78rem;
  letter-spacing: .08em;
  border: 1px solid currentColor;
}

.tag {
  font-family: var(--font-accent);
  text-transform: uppercase;
  color: var(--primary-700);
}

.tag--gold { color: var(--secondary-500); }
.tag--red { color: var(--accent-600); }

.chip {
  border-radius: 999px;
  color: var(--primary-700);
  border-color: rgba(11, 59, 46, .25);
}

.chip:hover,
.chip[aria-pressed="true"] {
  background: var(--primary-700);
  color: var(--white);
  border-color: var(--primary-700);
}

/* ---------- 14. 纸张面板 ---------- */
.panel {
  position: relative;
  background: var(--white);
  border: 1px solid rgba(11, 59, 46, .14);
  box-shadow: 6px 6px 0 rgba(11, 59, 46, .07);
  padding: clamp(20px, 3vw, 28px);
}

.panel::before {
  content: "";
  position: absolute;
  inset: 7px;
  border: 1px dashed rgba(212, 167, 44, .45);
  pointer-events: none;
}

.panel__label {
  position: absolute;
  z-index: 1;
  top: -11px;
  left: 14px;
  padding: 3px 10px;
  background: var(--secondary-500);
  color: var(--primary-900);
  font-family: var(--font-accent);
  font-size: .68rem;
  letter-spacing: .18em;
  text-transform: uppercase;
}

.panel__title {
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 1.12rem;
  color: var(--primary-900);
  margin-bottom: 8px;
}

.panel__text {
  font-size: .9rem;
  line-height: 1.65;
  color: var(--neutral-500);
}

/* ---------- 15. 数据卡 ---------- */
.stat-card {
  position: relative;
  padding: 20px 18px;
  background: var(--primary-700);
  color: var(--white);
  clip-path: polygon(12px 0, 100% 0, calc(100% - 12px) 100%, 0 100%);
}

.stat-card__value {
  display: block;
  font-family: var(--font-heading);
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  font-weight: 900;
  color: var(--secondary-300);
  line-height: 1;
}

.stat-card__label {
  display: block;
  margin-top: 8px;
  font-size: .78rem;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, .68);
}

/* ---------- 16. 图片容器 ---------- */
.image-frame {
  position: relative;
  display: block;
  overflow: hidden;
  background: var(--primary-700);
  border: 1px solid rgba(212, 167, 44, .45);
  box-shadow: 8px 8px 0 rgba(11, 59, 46, .1);
}

.image-frame--16x9 { aspect-ratio: 16 / 9; }
.image-frame--3x2 { aspect-ratio: 3 / 2; }
.image-frame--portrait { aspect-ratio: 3 / 4; }

.image-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform .6s var(--ease-out);
}

.image-frame:hover img { transform: scale(1.03); }

.image-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  border: 1px solid rgba(255, 255, 255, .18);
  pointer-events: none;
}

.image-frame__badge {
  position: absolute;
  top: 12px;
  left: 12px;
  z-index: 2;
  background: var(--secondary-500);
  color: var(--primary-900);
  font-family: var(--font-accent);
  font-size: .66rem;
  letter-spacing: .16em;
  padding: 4px 10px;
}

/* ---------- 17. 目录列表 ---------- */
.index-list {
  list-style: none;
  border-top: 1px solid rgba(11, 59, 46, .14);
}

.index-list__item { border-bottom: 1px solid rgba(11, 59, 46, .14); }

.index-list__link {
  display: flex;
  align-items: baseline;
  gap: 18px;
  padding: 16px 8px;
  color: var(--primary-900);
  transition: background-color .25s ease, padding-left .25s ease;
}

.index-list__link:hover {
  background: rgba(212, 167, 44, .12);
  padding-left: 16px;
}

.index-list__num {
  font-family: var(--font-accent);
  font-size: .8rem;
  color: var(--secondary-500);
}

.index-list__title { font-weight: 700; }
.index-list__meta {
  margin-left: auto;
  font-size: .8rem;
  color: var(--neutral-500);
  white-space: nowrap;
}

/* ---------- 18. 面包屑 ---------- */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-top: 20px;
  font-size: .82rem;
  color: rgba(255, 255, 255, .5);
}

.breadcrumb a { color: rgba(255, 255, 255, .78); }
.breadcrumb a:hover { color: var(--secondary-300); }
.breadcrumb__sep { color: rgba(255, 255, 255, .3); }
.breadcrumb__current { color: var(--secondary-300); }

/* ---------- 19. 内页刊头 ---------- */
.page-head {
  position: relative;
  overflow: hidden;
  padding: calc(var(--header-height) + 56px) 0 52px;
  color: var(--white);
  background:
    radial-gradient(circle at 88% -10%, rgba(212, 167, 44, .22), transparent 44%),
    repeating-linear-gradient(90deg, rgba(255, 255, 255, .03) 0 1px, transparent 1px 80px),
    repeating-linear-gradient(0deg, rgba(255, 255, 255, .025) 0 1px, transparent 1px 80px),
    linear-gradient(115deg, var(--primary-900) 0%, var(--primary-700) 100%);
}

.page-head::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--secondary-500) 0%, var(--secondary-500) 72%, var(--accent-600) 72%, var(--accent-600) 100%);
}

.page-head__inner {
  position: relative;
  max-width: var(--container-w);
  margin-inline: auto;
  padding-inline: clamp(16px, 4vw, 32px);
}

.page-head__num {
  position: absolute;
  right: clamp(0px, 2vw, 28px);
  top: -12px;
  font-family: var(--font-accent);
  font-weight: 700;
  font-size: clamp(5rem, 14vw, 9rem);
  line-height: 1;
  color: rgba(212, 167, 44, .12);
  pointer-events: none;
  user-select: none;
}

.page-head__kicker {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-accent);
  font-size: .76rem;
  letter-spacing: .3em;
  text-transform: uppercase;
  color: var(--secondary-500);
}

.page-head__kicker::before {
  content: "";
  width: 28px;
  height: 2px;
  background: var(--secondary-500);
}

.page-head__title {
  margin-top: 12px;
  font-family: var(--font-heading);
  font-size: clamp(2rem, 5vw, 3.4rem);
  font-weight: 900;
  letter-spacing: .02em;
  line-height: 1.1;
}

.page-head__desc {
  max-width: 640px;
  margin-top: 14px;
  color: rgba(255, 255, 255, .72);
  line-height: 1.7;
}

/* ---------- 20. 正文与分隔 ---------- */
.text-block {
  max-width: 780px;
  font-size: 1rem;
  line-height: 1.78;
  color: var(--neutral-800);
}

.text-block p + p { margin-top: 1em; }

.text-block h2,
.text-block h3 {
  margin: 1.8em 0 .5em;
  color: var(--primary-900);
}

.text-block h2 {
  font-size: 1.5rem;
  border-left: 4px solid var(--secondary-500);
  padding-left: 12px;
}

.text-block ul { padding-left: 1.2em; }
.text-block li + li { margin-top: .3em; }

.divider {
  height: 3px;
  margin: 0 0 48px;
  border: 0;
  background: linear-gradient(90deg, var(--secondary-500) 0%, var(--secondary-500) 68%, var(--accent-600) 68%, var(--accent-600) 100%);
}

/* ---------- 21. 章节跟随指示器 ---------- */
.chapter-tracker {
  position: fixed;
  right: 26px;
  top: 50%;
  z-index: 60;
  transform: translateY(-50%);
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 8px;
  pointer-events: none;
  opacity: 0;
  transition: opacity .35s ease;
}

.chapter-tracker.is-active { opacity: 1; }

.chapter-tracker__label {
  writing-mode: vertical-rl;
  font-family: var(--font-accent);
  font-size: .62rem;
  letter-spacing: .34em;
  color: var(--primary-700);
  padding: 10px 5px;
  border: 1px solid rgba(11, 59, 46, .22);
  background: rgba(245, 242, 233, .88);
}

.chapter-tracker__value {
  font-family: var(--font-heading);
  font-size: .82rem;
  font-weight: 800;
  letter-spacing: .08em;
  color: var(--primary-900);
  background: var(--secondary-500);
  padding: 6px 12px;
  box-shadow: 3px 3px 0 rgba(11, 59, 46, .16);
}

[data-chapter] { position: relative; scroll-margin-top: calc(var(--header-height) + 14px); }

[data-chapter].is-chapter-active::after {
  content: "";
  position: absolute;
  top: 0; bottom: 0; left: -1px;
  width: 4px;
  background: linear-gradient(180deg, var(--secondary-500), var(--secondary-300));
}

@media (max-width: 767px) { .chapter-tracker { display: none; } }

/* ---------- 22. 滚动显现 ---------- */
html.has-reveal [data-reveal] {
  transition: opacity .65s ease, transform .65s var(--ease-out);
}

html.has-reveal [data-reveal]:not(.is-revealed) {
  opacity: 0;
  transform: translateY(28px);
}

/* ---------- 23. 响应式细调 ---------- */
@media (max-width: 560px) {
  .site-brand__tag { display: none; }
  .page-head { padding-top: calc(var(--header-height) + 40px); }
  .page-head__num { right: 4px; }
  .section-head__meta { white-space: normal; }
}

/* ---------- 24. 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *, *::before, *::after {
    transition-duration: .01ms !important;
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
  }

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