*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --c-night: #0B1F33;
  --c-abyss: #0A1118;
  --c-midnight: #08101A;
  --c-gold: #D4AF37;
  --c-gold-soft: rgba(212, 175, 55, 0.2);
  --c-crimson: #7A1F2B;
  --c-ivory: #F5F0E6;
  --c-moon: #B8C4D0;
  --c-glass: rgba(255, 255, 255, 0.07);
  --c-line: #1F3A4F;
  --c-blue-deep: #102033;
  --font-serif: "Noto Serif SC", "Source Han Serif SC", "Songti SC", "SimSun", serif;
  --font-sans: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "IBM Plex Mono", "JetBrains Mono", "SFMono-Regular", "Consolas", monospace;
  --text-lg: 48px;
  --text-md: 34px;
  --text-sm: 24px;
  --text-base: 16px;
  --text-note: 14px;
  --text-micro: 12px;
  --text-mini: 11px;
  --radius: 4px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --header-h: 64px;
  --announce-h: 36px;
}

html {
  scroll-behavior: smooth;
  scrollbar-color: rgba(212, 175, 55, 0.4) var(--c-midnight);
}

body {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: 1.75;
  color: var(--c-ivory);
  background-color: var(--c-night);
  background-image:
    radial-gradient(1200px 600px at 85% -10%, rgba(212, 175, 55, 0.08), transparent 60%),
    radial-gradient(900px 500px at -10% 30%, rgba(26, 58, 84, 0.6), transparent 70%);
  background-repeat: no-repeat;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-serif);
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: -0.01em;
}

p { margin: 0; }
ul, ol { margin: 0; padding: 0; list-style: none; }
a { color: var(--c-gold); text-decoration: none; transition: color 0.2s ease; }
a:hover { color: var(--c-ivory); }
button { font-family: inherit; cursor: pointer; }
img, svg { display: block; max-width: 100%; }
address { font-style: normal; }
::selection { background: rgba(212, 175, 55, 0.3); color: var(--c-ivory); }

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

main {
  display: block;
}

#main-content {
  min-height: 60vh;
  scroll-margin-top: var(--header-h);
}

.container {
  width: min(1440px, 100% - 48px);
  margin-inline: auto;
}

@media (max-width: 640px) {
  .container {
    width: calc(100% - 32px);
  }
}

/* ---------- 通用文字与工具 ---------- */
.section-label {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.28em;
  color: var(--c-gold);
  text-transform: uppercase;
}

.section-label::before {
  content: "";
  width: 28px;
  height: 1px;
  background: var(--c-gold);
}

.display-title {
  font-family: var(--font-serif);
  font-size: clamp(40px, 7vw, 88px);
  font-weight: 900;
  line-height: 1.08;
  letter-spacing: -0.01em;
  color: var(--c-ivory);
}

.lede {
  font-size: 18px;
  line-height: 1.8;
  color: var(--c-moon);
  max-width: 60ch;
}

.note {
  font-size: 12px;
  color: var(--c-moon);
  letter-spacing: 0.14em;
}

.divider {
  border: 0;
  height: 1px;
  margin: 48px 0;
  background: linear-gradient(90deg, transparent, rgba(212, 175, 55, 0.4), transparent);
}

/* ---------- 通用按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 12px 22px;
  font-size: 14px;
  letter-spacing: 0.12em;
  border-radius: 3px;
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none;
  color: var(--c-ivory);
  transition: transform 0.3s ease, background 0.3s ease, color 0.3s ease, border-color 0.3s ease;
}

.btn:hover {
  transform: translateY(-4px);
}

.btn--primary {
  background: linear-gradient(135deg, #e0c04f, var(--c-gold));
  color: var(--c-midnight);
  font-weight: 700;
  padding: 13px 30px;
  border-color: transparent;
}

.btn--primary:hover {
  color: var(--c-midnight);
  box-shadow: 0 8px 30px rgba(212, 175, 55, 0.28);
}

.btn--ghost {
  background: transparent;
  border-color: rgba(212, 175, 55, 0.5);
  color: var(--c-gold);
}

.btn--ghost:hover {
  background: var(--c-gold-soft);
  border-color: var(--c-gold);
  color: var(--c-gold);
}

.btn--dark {
  background: var(--c-midnight);
  border-color: var(--c-line);
  color: var(--c-ivory);
}

.btn--dark:hover {
  border-color: var(--c-gold);
  color: var(--c-gold);
}

/* ---------- 面包屑 ---------- */
.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  padding: 24px 0;
  font-size: 13px;
  color: var(--c-moon);
}

.breadcrumbs a {
  color: var(--c-moon);
}

.breadcrumbs a:hover {
  color: var(--c-gold);
}

.breadcrumbs__sep {
  color: var(--c-gold);
  opacity: 0.5;
}

/* ---------- Skip Link ---------- */
.skip-link {
  position: fixed;
  top: -40px;
  left: 16px;
  z-index: 2000;
  padding: 10px 18px;
  background: var(--c-midnight);
  border: 1px solid var(--c-gold);
  color: var(--c-gold);
  font-size: 13px;
  letter-spacing: 0.1em;
  border-radius: 3px;
  transition: top 0.3s ease;
}

.skip-link:focus {
  top: 8px;
  color: var(--c-gold);
}

/* ---------- 阅读进度条 ---------- */
.reading-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  z-index: 1900;
  transform-origin: 0 50%;
  transform: scaleX(0);
  pointer-events: none;
}

.reading-progress::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, var(--c-gold), rgba(212, 175, 55, 0.35), var(--c-crimson));
}

/* ---------- 公告栏 ---------- */
.announcement-bar {
  background: linear-gradient(90deg, var(--c-midnight) 0%, var(--c-blue-deep) 60%, var(--c-night) 100%);
  border-bottom: 1px solid rgba(212, 175, 55, 0.22);
}

.announcement-bar__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  max-width: 1440px;
  margin-inline: auto;
  padding: 9px 24px;
}

.announcement-bar__text {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--c-moon);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.announcement-bar__code {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--c-gold);
  border: 1px solid rgba(212, 175, 55, 0.35);
  border-radius: 2px;
  padding: 2px 8px;
  white-space: nowrap;
}

@media (max-width: 640px) {
  .announcement-bar__inner {
    padding-inline: 16px;
  }

  .announcement-bar__code {
    display: none;
  }
}

/* ---------- 头部条 ---------- */
.header-bar {
  position: sticky;
  top: 0;
  z-index: 1500;
  background: rgba(11, 31, 51, 0.88);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--c-line);
}

.header-bar__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: var(--header-h);
  padding-block: 8px;
}

/* ---------- 品牌 ---------- */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--c-ivory);
  text-decoration: none;
}

.brand:hover {
  color: var(--c-ivory);
}

.brand__mark {
  display: grid;
  place-items: center;
  width: 40px;
  height: 46px;
  background: linear-gradient(145deg, #d9b64a, #8f6f1f 55%, var(--c-crimson));
  clip-path: polygon(0 0, 100% 0, 100% 68%, 50% 100%, 0 68%);
  font-family: var(--font-serif);
  font-weight: 900;
  font-size: 20px;
  color: var(--c-ivory);
  letter-spacing: 0;
  transition: box-shadow 0.3s ease;
}

.brand:hover .brand__mark {
  box-shadow: 0 0 0 3px rgba(212, 175, 55, 0.15), 0 0 24px rgba(212, 175, 55, 0.25);
}

.brand__body {
  display: flex;
  flex-direction: column;
}

.brand__name {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 20px;
  letter-spacing: 0.08em;
  color: var(--c-ivory);
  line-height: 1.2;
}

.brand__subline {
  font-size: 11px;
  color: var(--c-moon);
  letter-spacing: 0.18em;
  margin-top: 2px;
}

.brand--footer .brand__mark {
  width: 34px;
  height: 40px;
  font-size: 16px;
}

/* ---------- 导航开关 ---------- */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  background: transparent;
  border: 1px solid var(--c-line);
  border-radius: 3px;
  transition: border-color 0.3s ease;
}

.nav-toggle:hover {
  border-color: var(--c-gold);
}

.nav-toggle__bar {
  display: block;
  width: 18px;
  height: 2px;
  background: var(--c-gold);
  transition: transform 0.3s ease, opacity 0.2s ease;
}

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

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

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

@media (max-width: 1023px) {
  .nav-toggle {
    display: inline-flex;
  }
}

/* ---------- 侧边轨道导航 ---------- */
.site-nav {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  width: min(340px, 86vw);
  padding: 88px 28px 36px;
  background: rgba(8, 16, 26, 0.97);
  -webkit-backdrop-filter: blur(18px);
  backdrop-filter: blur(18px);
  border-left: 1px solid rgba(212, 175, 55, 0.35);
  transform: translateX(100%);
  transition: transform 0.35s var(--ease);
  z-index: 1600;
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: 24px;
  overflow-y: auto;
}

.site-nav[data-open] {
  transform: translateX(0);
}

.site-nav__heading {
  display: none;
}

.nav-list {
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: 4px;
  padding: 0;
  border: 0;
}

.nav-list__item {
  position: relative;
}

.nav-list__link {
  position: relative;
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 14px 16px;
  font-size: 15px;
  letter-spacing: 0.08em;
  color: var(--c-ivory);
  text-decoration: none;
  border: 1px solid transparent;
  border-radius: 4px;
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
  writing-mode: horizontal-tb;
  text-orientation: mixed;
}

.nav-list__link:hover {
  background: rgba(212, 175, 55, 0.08);
  color: var(--c-gold);
}

.nav-list__link[aria-current="page"] {
  background: rgba(212, 175, 55, 0.1);
  border-color: rgba(212, 175, 55, 0.4);
  color: var(--c-gold);
}

.nav-list__index {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--c-gold);
  background: rgba(212, 175, 55, 0.1);
  border: 1px solid rgba(212, 175, 55, 0.25);
  border-radius: 2px;
  padding: 2px 6px;
  letter-spacing: 0.06em;
  line-height: 1.4;
  writing-mode: horizontal-tb;
}

.nav-list__label {
  line-height: 1.5;
}

.bookmark-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  margin-top: 16px;
  background: transparent;
  border: 1px solid rgba(212, 175, 55, 0.35);
  border-radius: 4px;
  padding: 10px 16px;
  color: var(--c-gold);
  font-size: 12px;
  letter-spacing: 0.2em;
  transition: background 0.3s ease, border-color 0.3s ease;
}

.bookmark-toggle:hover {
  background: rgba(212, 175, 55, 0.1);
  border-color: var(--c-gold);
}

.bookmark-toggle__icon {
  font-size: 14px;
  color: var(--c-gold);
}

.bookmark-toggle__text {
  letter-spacing: 0.18em;
}

@media (min-width: 1024px) {
  .site-nav {
    top: 50%;
    right: 18px;
    bottom: auto;
    transform: translateY(-50%);
    width: auto;
    padding: 18px 8px;
    align-items: center;
    gap: 18px;
    background: rgba(10, 17, 24, 0.68);
    border: 1px solid rgba(31, 58, 79, 0.85);
    border-radius: 60px;
    box-shadow: 0 12px 44px rgba(0, 0, 0, 0.4);
    max-height: calc(100vh - 48px);
    overflow-y: auto;
  }

  .site-nav[data-open] {
    transform: translateY(-50%);
  }

  .site-nav__heading {
    display: flex;
    flex-direction: row;
    align-items: center;
    gap: 8px;
    writing-mode: vertical-rl;
    text-orientation: mixed;
    font-size: 10px;
    letter-spacing: 0.3em;
    color: var(--c-moon);
    text-transform: uppercase;
  }

  .site-nav__label {
    writing-mode: vertical-rl;
    text-orientation: mixed;
  }

  .site-nav__index {
    font-family: var(--font-mono);
    font-size: 22px;
    color: var(--c-gold);
    writing-mode: horizontal-tb;
    letter-spacing: 0.04em;
  }

  .nav-list {
    flex-direction: column;
    align-items: center;
    gap: 2px;
    padding: 10px 2px;
    border-top: 1px solid rgba(212, 175, 55, 0.18);
    border-bottom: 1px solid rgba(212, 175, 55, 0.18);
  }

  .nav-list__link {
    flex-direction: row;
    gap: 6px;
    padding: 12px 6px;
    font-size: 13px;
    letter-spacing: 0.22em;
    border-radius: 40px;
    writing-mode: vertical-rl;
    text-orientation: mixed;
    border: 0;
    background: transparent;
  }

  .nav-list__link::before {
    content: "";
    position: absolute;
    inset: 2px;
    background: rgba(212, 175, 55, 0.06);
    border-left: 1px solid transparent;
    border-right: 1px solid transparent;
    border-radius: 40px;
    z-index: -1;
    transition: border-color 0.2s ease, background 0.2s ease;
  }

  .nav-list__link:hover {
    background: transparent;
  }

  .nav-list__link[aria-current="page"] {
    background: transparent;
    border: 0;
  }

  .nav-list__link[aria-current="page"]::before {
    border-left-color: var(--c-gold);
    background: rgba(212, 175, 55, 0.12);
  }

  .nav-list__index {
    writing-mode: horizontal-tb;
    font-size: 10px;
    padding: 0;
    background: transparent;
    border: 0;
    width: auto;
  }

  .bookmark-toggle {
    flex-direction: row;
    gap: 8px;
    margin-top: 0;
    padding: 8px 6px;
    border-radius: 40px;
    writing-mode: vertical-rl;
    text-orientation: mixed;
  }

  .bookmark-toggle__icon {
    writing-mode: horizontal-tb;
  }
}

/* ---------- 导航底幕 ---------- */
.nav-backdrop {
  display: none;
}

@media (max-width: 1023px) {
  .nav-backdrop {
    display: block;
    position: fixed;
    inset: 0;
    background: rgba(4, 8, 12, 0.55);
    opacity: 0;
    pointer-events: none;
    -webkit-backdrop-filter: blur(2px);
    backdrop-filter: blur(2px);
    transition: opacity 0.3s ease;
    z-index: 1550;
  }

  body[data-nav-open] .nav-backdrop {
    opacity: 1;
    pointer-events: auto;
  }
}

body[data-nav-open],
body[data-bookmark-open] {
  overflow: hidden;
}

/* ---------- 常用页面收藏抽屉 ---------- */
.bookmark-drawer {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  width: min(340px, 86vw);
  padding: 64px 32px 40px;
  background: linear-gradient(160deg, var(--c-abyss), var(--c-night) 60%);
  border-left: 1px solid rgba(212, 175, 55, 0.4);
  box-shadow: -20px 0 60px rgba(0, 0, 0, 0.4);
  transform: translateX(105%);
  transition: transform 0.4s var(--ease);
  z-index: 1700;
  display: flex;
  flex-direction: column;
  overflow-y: auto;
}

.bookmark-drawer[data-open] {
  transform: translateX(0);
}

.bookmark-drawer__head {
  padding-bottom: 24px;
  border-bottom: 1px solid var(--c-line);
  margin-bottom: 24px;
}

.bookmark-drawer__title {
  font-family: var(--font-serif);
  font-size: 24px;
  font-weight: 700;
  color: var(--c-ivory);
  letter-spacing: 0.06em;
}

.bookmark-drawer__note {
  display: block;
  font-size: 12px;
  color: var(--c-moon);
  letter-spacing: 0.18em;
  margin-top: 6px;
}

.bookmark-list {
  flex: 1;
}

.bookmark-list__item + .bookmark-list__item {
  border-top: 1px solid rgba(31, 58, 79, 0.5);
}

.bookmark-list__link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 4px;
  color: var(--c-moon);
  font-size: 14px;
  letter-spacing: 0.08em;
  transition: color 0.2s ease;
}

.bookmark-list__link::after {
  content: "→";
  color: var(--c-gold);
  opacity: 0;
  transform: translateX(-8px);
  transition: opacity 0.3s ease, transform 0.3s ease;
}

.bookmark-list__link:hover {
  color: var(--c-gold);
}

.bookmark-list__link:hover::after {
  opacity: 1;
  transform: translateX(0);
}

.bookmark-drawer__foot {
  margin-top: auto;
  padding-top: 24px;
  font-size: 11px;
  color: var(--c-moon);
  letter-spacing: 0.1em;
}

/* ---------- 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: 120px;
  background: linear-gradient(180deg, #0a141d 0%, var(--c-midnight) 100%);
  border-top: 1px solid rgba(212, 175, 55, 0.25);
}

.site-footer::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: clamp(120px, 20vw, 320px);
  height: 1px;
  background: linear-gradient(90deg, var(--c-gold), transparent);
}

.site-footer__main {
  display: grid;
  grid-template-columns: 5fr 4fr 3fr;
  gap: 48px;
  padding: 72px 0 56px;
}

.site-footer__brand {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.site-footer__desc {
  margin-top: 24px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--c-moon);
  max-width: 42ch;
}

.site-footer__trust {
  margin-top: 16px;
  font-size: 12px;
  line-height: 1.7;
  color: rgba(184, 196, 208, 0.7);
  border-left: 2px solid rgba(212, 175, 55, 0.4);
  padding-left: 12px;
}

.site-footer__navs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.footer-nav__title {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.24em;
  color: var(--c-gold);
  text-transform: uppercase;
  margin-bottom: 20px;
}

.footer-nav__list li + li {
  margin-top: 12px;
}

.footer-nav__list a {
  color: var(--c-moon);
  font-size: 14px;
  letter-spacing: 0.04em;
  transition: color 0.2s ease, padding-left 0.2s ease;
}

.footer-nav__list a:hover {
  color: var(--c-gold);
  padding-left: 4px;
}

.footer-address {
  font-size: 14px;
  line-height: 1.9;
  color: var(--c-moon);
  margin-bottom: 16px;
}

.footer-meta {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  font-size: 13px;
  color: var(--c-moon);
  line-height: 2;
}

.footer-meta + .footer-meta {
  margin-top: 6px;
}

.footer-meta__label {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--c-gold);
  letter-spacing: 0.12em;
  background: rgba(212, 175, 55, 0.08);
  border: 1px solid rgba(212, 175, 55, 0.2);
  padding: 2px 8px;
  border-radius: 2px;
  flex-shrink: 0;
  line-height: 1.6;
  margin-top: 5px;
}

.footer-meta__value {
  word-break: break-all;
}

.footer-meta__note {
  font-size: 11px;
  color: rgba(184, 196, 208, 0.6);
  letter-spacing: 0.1em;
  margin-top: 12px;
}

.site-footer__bottom {
  border-top: 1px solid var(--c-line);
  padding: 20px 0;
}

.site-footer__bottom-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

.site-footer__copy {
  font-size: 12px;
  color: var(--c-moon);
  letter-spacing: 0.08em;
}

.site-footer__icp {
  font-family: var(--font-mono);
  font-size: 11px;
  color: rgba(184, 196, 208, 0.7);
  letter-spacing: 0.14em;
}

@media (max-width: 960px) {
  .site-footer {
    margin-top: 72px;
  }

  .site-footer__main {
    grid-template-columns: 1fr;
    gap: 40px;
    padding: 56px 0 48px;
  }
}

/* ---------- 回到顶部 ---------- */
.to-top {
  position: fixed;
  right: 24px;
  bottom: 24px;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 1px solid rgba(212, 175, 55, 0.4);
  background: rgba(10, 17, 24, 0.82);
  color: var(--c-gold);
  display: grid;
  place-items: center;
  opacity: 0;
  transform: translateY(12px);
  pointer-events: none;
  transition: opacity 0.3s ease, transform 0.3s ease, background 0.3s ease, color 0.3s ease;
  z-index: 1200;
}

.to-top.is-visible {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

.to-top:hover {
  background: var(--c-gold);
  color: var(--c-midnight);
  transform: translateY(-3px);
}

.to-top__icon {
  font-size: 18px;
  line-height: 1;
}

/* ---------- 章节块 ---------- */
.chapter {
  padding: 96px 0;
  position: relative;
}

.chapter__head {
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: 32px;
  margin-bottom: 48px;
  align-items: start;
}

.chapter__index {
  font-family: var(--font-mono);
  font-size: 64px;
  line-height: 1;
  color: transparent;
  -webkit-text-stroke: 1px rgba(212, 175, 55, 0.35);
}

.chapter__label {
  font-size: 12px;
  letter-spacing: 0.3em;
  color: var(--c-gold);
  text-transform: uppercase;
}

.chapter__title {
  font-family: var(--font-serif);
  font-size: var(--text-md);
  font-weight: 700;
  margin-top: 8px;
  color: var(--c-ivory);
}

@media (max-width: 768px) {
  .chapter__head {
    grid-template-columns: 64px 1fr;
    gap: 16px;
  }

  .chapter__index {
    font-size: 40px;
  }

  .chapter__title {
    font-size: 24px;
  }
}

/* ---------- 卡片 ---------- */
.glass-card {
  position: relative;
  background: var(--c-glass);
  border: 1px solid rgba(31, 58, 79, 0.7);
  border-radius: 6px;
  padding: 32px;
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
}

.glass-card::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: 6px;
  pointer-events: none;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.06);
}

.solid-card {
  position: relative;
  background: var(--c-abyss);
  border: 1px solid var(--c-line);
  border-radius: 6px;
  padding: 32px;
}

@media (max-width: 768px) {
  .glass-card,
  .solid-card {
    padding: 24px;
  }
}

/* ---------- 图片占位容器 ---------- */
.media-frame {
  position: relative;
  overflow: hidden;
  background: linear-gradient(135deg, rgba(212, 175, 55, 0.08), rgba(31, 58, 79, 0.4));
  border: 1px solid var(--c-line);
  border-radius: 4px;
  aspect-ratio: 16 / 9;
}

.media-frame::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(212, 175, 55, 0.08) 1px, transparent 1px),
    linear-gradient(90deg, rgba(212, 175, 55, 0.08) 1px, transparent 1px);
  background-size: 32px 32px;
}

.media-frame::after {
  content: attr(data-caption);
  position: absolute;
  left: 12px;
  bottom: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--c-moon);
  background: rgba(8, 16, 26, 0.7);
  padding: 2px 8px;
  border-radius: 2px;
  border-left: 1px solid rgba(212, 175, 55, 0.4);
}

.media-frame--portrait {
  aspect-ratio: 3 / 4;
}

.media-frame--wide {
  aspect-ratio: 21 / 9;
}

.media-frame--square {
  aspect-ratio: 1 / 1;
}

/* ---------- 标签 ---------- */
.tag {
  display: inline-block;
  padding: 4px 14px;
  font-size: 12px;
  letter-spacing: 0.08em;
  border-radius: 20px;
  border: 1px solid var(--c-line);
  color: var(--c-moon);
}

.tag--gold {
  border-color: rgba(212, 175, 55, 0.6);
  color: var(--c-gold);
  background: rgba(212, 175, 55, 0.06);
}

.tag--crimson {
  border-color: rgba(122, 31, 43, 0.6);
  color: #d98a94;
  background: rgba(122, 31, 43, 0.15);
}

/* ---------- 数据表格与版本号 ---------- */
.data-table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--font-mono);
  font-size: 13px;
  background: var(--c-midnight);
  border: 1px solid var(--c-line);
  border-radius: 4px;
  overflow: hidden;
}

.data-table th,
.data-table td {
  padding: 14px 16px;
  border-bottom: 1px solid var(--c-line);
  text-align: left;
}

.data-table th {
  color: var(--c-gold);
  font-weight: 500;
  letter-spacing: 0.1em;
  background: rgba(212, 175, 55, 0.05);
}

.data-table tr:last-child td {
  border-bottom: 0;
}

.version-chip {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: #e5b0b8;
  background: var(--c-midnight);
  border: 1px solid rgba(122, 31, 43, 0.6);
  padding: 2px 10px;
  border-radius: 2px;
}

/* ---------- 信息索引网格 ---------- */
.info-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.info-item {
  padding: 20px 0;
  border-bottom: 1px solid var(--c-line);
}

.info-item__label {
  display: block;
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--c-moon);
  margin-bottom: 6px;
  text-transform: uppercase;
}

.info-item__value {
  font-family: var(--font-serif);
  font-size: 24px;
  font-weight: 600;
  color: var(--c-ivory);
}

@media (max-width: 640px) {
  .info-grid {
    grid-template-columns: 1fr;
  }
}

/* ---------- 滚动渐现 ---------- */
@media (prefers-reduced-motion: no-preference) {
  .reveal {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.5s ease-out, transform 0.5s ease-out;
  }

  .reveal.is-revealed {
    opacity: 1;
    transform: none;
  }
}

/* ---------- 减少动态偏好 ---------- */
@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;
  }

  .btn:hover,
  .to-top:hover {
    transform: none;
  }
}