/* ============ 变量与基准 ============ */
:root {
  --color-deep: #0B1D3A;
  --color-indigo: #102A4C;
  --color-gold: #D4AF37;
  --color-gold-bright: #F2C94C;
  --color-red: #D7263D;
  --color-blue-soft: #2D5A88;
  --color-paper: #F5F0E8;
  --color-charcoal: #1E2432;
  --color-ink: #0A1423;
  --color-white: #FFFFFF;

  --font-heading: "Noto Sans SC", "Source Han Sans SC", "Microsoft YaHei", sans-serif;
  --font-body: "Noto Serif SC", "Source Han Serif SC", "SimSun", serif;
  --font-mono: "JetBrains Mono", "Roboto Mono", "Courier New", monospace;

  --fs-hero: clamp(2.5rem, 6vw, 3.5rem);
  --fs-h1: clamp(2rem, 4.5vw, 2.5rem);
  --fs-h2: clamp(1.65rem, 3.5vw, 2rem);
  --fs-h3: clamp(1.3rem, 2.5vw, 1.5rem);
  --fs-h4: 1.5rem;
  --fs-body: 1rem;
  --fs-lead: 1.2rem;
  --fs-small: 0.88rem;
  --fs-micro: 0.78rem;
  --fs-data: 1.1rem;

  --space-xs: 0.5rem;
  --space-sm: 0.75rem;
  --space-md: 1.5rem;
  --space-lg: 3rem;
  --space-xl: 5rem;
  --space-2xl: 8rem;

  --header-height: 76px;
  --container-max: 1320px;
  --gutter: clamp(1.2rem, 4vw, 2.5rem);
  --radius-sm: 4px;
  --radius-md: 10px;
  --radius-lg: 18px;
  --shadow-card: 0 12px 34px rgba(0, 0, 0, 0.35);
  --border-gold: 1px solid rgba(212, 175, 55, 0.45);
}

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

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

body {
  min-height: 100vh;
  background:
    radial-gradient(circle at 72% 22%, rgba(45, 90, 136, 0.2), transparent 46%),
    radial-gradient(circle at 18% 84%, rgba(212, 175, 55, 0.07), transparent 38%),
    var(--color-deep);
  color: var(--color-paper);
  font-family: var(--font-body);
  font-size: var(--fs-body);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

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

button, input, select, textarea {
  font: inherit;
  color: inherit;
}

ul, ol {
  list-style: none;
}

a {
  color: var(--color-gold);
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover {
  color: var(--color-gold-bright);
}

h1, h2, h3, h4, h5 {
  font-family: var(--font-heading);
  font-weight: 800;
  line-height: 1.25;
  color: var(--color-paper);
  text-wrap: balance;
}

p {
  margin-bottom: 1rem;
}

strong {
  font-weight: 700;
  color: var(--color-white);
}

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

/* ============ 跳转与无障碍 ============ */
.skip-link {
  position: fixed;
  top: -100px;
  left: 16px;
  z-index: 2000;
  padding: 0.7rem 1.3rem;
  background: var(--color-gold);
  color: var(--color-deep);
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 0.9rem;
  border-radius: 0 0 10px 10px;
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.35);
  transition: top 0.2s ease;
}

.skip-link:focus-visible {
  top: 0;
}

.main-content {
  display: block;
}

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

/* ============ 滚动进度条 ============ */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 1100;
  height: 3px;
  width: 0;
  background: linear-gradient(90deg, var(--color-gold), var(--color-gold-bright));
  box-shadow: 0 0 12px rgba(242, 201, 76, 0.5);
  pointer-events: none;
}

/* ============ 头部 ============ */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--header-height);
  background: linear-gradient(to bottom, rgba(11, 29, 58, 0.88), rgba(11, 29, 58, 0.2) 80%, transparent);
  border-bottom: 1px solid transparent;
  transition: background 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}

.site-header.is-scrolled {
  background: rgba(11, 29, 58, 0.95);
  border-bottom-color: rgba(212, 175, 55, 0.35);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.4);
}

.site-header__inner {
  max-width: var(--container-max);
  height: 100%;
  margin: 0 auto;
  padding: 0 var(--gutter);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
}

.site-brand {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  color: var(--color-paper);
  flex-shrink: 0;
}

.site-brand:hover {
  color: var(--color-paper);
}

.site-brand__symbol {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 2px solid var(--color-gold);
  border-radius: 9px;
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: 1.35rem;
  line-height: 1;
  color: var(--color-gold);
  background: rgba(212, 175, 55, 0.08);
  box-shadow: inset 0 0 16px rgba(212, 175, 55, 0.25);
}

.site-brand__meta {
  display: flex;
  flex-direction: column;
}

.site-brand__name {
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 1.28rem;
  line-height: 1.1;
  letter-spacing: 0.05em;
}

.site-brand__tagline {
  font-family: var(--font-body);
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  color: rgba(245, 240, 232, 0.65);
  text-transform: uppercase;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.site-nav__list {
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.site-nav__item {
  margin: 0;
}

.site-nav__link {
  display: inline-block;
  padding: 0.45rem 0.82rem;
  font-family: var(--font-heading);
  font-size: 0.9rem;
  font-weight: 600;
  color: rgba(245, 240, 232, 0.84);
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  transition: color 0.2s ease, background 0.2s ease, border-color 0.2s ease;
}

.site-nav__link:hover,
.site-nav__link:focus-visible {
  color: var(--color-gold-bright);
  background: rgba(212, 175, 55, 0.08);
}

.site-nav__link[aria-current="page"] {
  color: var(--color-gold);
  border-color: rgba(212, 175, 55, 0.6);
  background: rgba(212, 175, 55, 0.1);
}

.site-nav__cta {
  flex-shrink: 0;
  padding: 0.5rem 1.15rem;
  font-size: 0.85rem;
}

.site-nav-toggle {
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  width: 46px;
  height: 46px;
  background: rgba(245, 240, 232, 0.08);
  border: 1px solid rgba(212, 175, 55, 0.5);
  border-radius: 8px;
  cursor: pointer;
  transition: background 0.2s ease, border-color 0.2s ease;
}

.site-nav-toggle:hover {
  background: rgba(212, 175, 55, 0.14);
  border-color: var(--color-gold-bright);
}

.site-nav-toggle__line {
  display: block;
  width: 18px;
  height: 2px;
  background: var(--color-paper);
  border-radius: 2px;
  transition: transform 0.28s ease, opacity 0.28s ease;
}

.site-nav-toggle[aria-expanded="true"] .site-nav-toggle__line:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}

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

.site-nav-toggle[aria-expanded="true"] .site-nav-toggle__line:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

/* ============ 返回顶部 ============ */
.backtop {
  position: fixed;
  right: 1.4rem;
  bottom: 1.4rem;
  z-index: 900;
  width: 46px;
  height: 46px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid rgba(212, 175, 55, 0.7);
  border-radius: 50%;
  background: rgba(11, 29, 58, 0.9);
  color: var(--color-gold);
  cursor: pointer;
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.4);
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: opacity 0.25s ease, transform 0.25s ease, visibility 0.25s ease, background 0.25s ease, color 0.25s ease;
}

.backtop.is-visible {
  opacity: 1;
  visibility: visible;
  transform: none;
}

.backtop:hover,
.backtop:focus-visible {
  background: var(--color-gold);
  color: var(--color-deep);
}

.backtop__icon {
  font-family: var(--font-heading);
  font-size: 1.35rem;
  line-height: 1;
}

/* ============ 页脚 ============ */
.site-footer {
  background: var(--color-ink);
  color: rgba(245, 240, 232, 0.82);
  font-family: var(--font-body);
  border-top: 2px solid var(--color-gold);
}

.site-footer__accent {
  height: 4px;
  background: linear-gradient(90deg, var(--color-gold) 0%, var(--color-red) 45%, var(--color-indigo) 100%);
}

.site-footer__inner {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: var(--space-xl) var(--gutter) var(--space-lg);
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: var(--space-lg);
}

.site-footer__brand {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.6rem;
}

.site-footer__logo {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  color: var(--color-paper);
}

.site-footer__logo:hover {
  color: var(--color-gold-bright);
}

.site-footer__symbol {
  width: 38px;
  height: 38px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 2px solid var(--color-gold);
  border-radius: 8px;
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: 1.1rem;
  color: var(--color-gold);
  background: rgba(212, 175, 55, 0.08);
}

.site-footer__name {
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 1.15rem;
  letter-spacing: 0.04em;
}

.site-footer__tagline {
  font-family: var(--font-heading);
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-gold);
  margin: 0;
}

.site-footer__trust {
  font-size: 0.9rem;
  line-height: 1.8;
  color: rgba(245, 240, 232, 0.6);
  margin: 0;
  max-width: 440px;
  border-left: 2px solid rgba(212, 175, 55, 0.5);
  padding-left: 1rem;
}

.site-footer__heading {
  font-family: var(--font-heading);
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-gold);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-bottom: 1rem;
  padding-bottom: 0.4rem;
  border-bottom: 1px solid rgba(212, 175, 55, 0.3);
}

.site-footer__list,
.site-footer__links {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
  font-size: 0.92rem;
}

.site-footer__list li,
.site-footer__links li {
  line-height: 1.6;
  color: rgba(245, 240, 232, 0.72);
}

.site-footer__link {
  color: var(--color-gold);
  transition: color 0.2s ease, padding-left 0.2s ease;
}

.site-footer__link:hover,
.site-footer__link:focus-visible {
  color: var(--color-gold-bright);
  padding-left: 0.2rem;
}

.site-footer__note {
  font-size: 0.92rem;
  line-height: 1.8;
  color: rgba(245, 240, 232, 0.68);
  margin-bottom: 1rem;
}

.site-footer__meta {
  border-top: 1px solid rgba(45, 90, 136, 0.4);
  background: rgba(11, 29, 58, 0.55);
}

.site-footer__meta-inner {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 1rem var(--gutter);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
  font-size: 0.84rem;
  color: rgba(245, 240, 232, 0.55);
}

.site-footer__copyright,
.site-footer__icp {
  margin: 0;
  font-family: var(--font-heading);
}

/* ============ 容器与栅格 ============ */
.container {
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--gutter);
  width: 100%;
}

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

.grid__span-3 { grid-column: span 3; }
.grid__span-4 { grid-column: span 4; }
.grid__span-6 { grid-column: span 6; }
.grid__span-8 { grid-column: span 8; }
.grid__span-12 { grid-column: span 12; }

/* ============ 章节 ============ */
.section {
  padding: clamp(3rem, 7vw, 6rem) 0;
}

.section__head {
  display: flex;
  align-items: flex-end;
  gap: 1.2rem;
  flex-wrap: wrap;
  margin-bottom: 2.5rem;
}

.section__index {
  font-family: var(--font-mono);
  font-size: 2.4rem;
  font-weight: 700;
  line-height: 1;
  color: var(--color-gold);
  opacity: 0.75;
}

.section__title {
  font-family: var(--font-heading);
  font-size: var(--fs-h2);
  font-weight: 800;
}

.section__rule {
  flex: 1 1 120px;
  min-width: 60px;
  height: 1px;
  background: linear-gradient(90deg, rgba(212, 175, 55, 0.65), rgba(212, 175, 55, 0));
}

.section__lead {
  margin-top: 0.8rem;
  color: rgba(245, 240, 232, 0.7);
  max-width: 640px;
}

.rule-gold {
  height: 1px;
  border: none;
  margin: 0;
  background: linear-gradient(90deg, transparent, rgba(212, 175, 55, 0.6), transparent);
}

/* ============ 按钮 ============ */
.site-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 0.92rem;
  padding: 0.62rem 1.35rem;
  color: var(--color-deep);
  background: linear-gradient(135deg, var(--color-gold), var(--color-gold-bright));
  border: none;
  border-radius: 40px;
  cursor: pointer;
  text-decoration: none;
  box-shadow: 0 4px 18px rgba(212, 175, 55, 0.35);
  transition: transform 0.2s ease, box-shadow 0.2s ease, filter 0.2s ease;
}

.site-btn:hover,
.site-btn:focus-visible {
  color: var(--color-deep);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(242, 201, 76, 0.45);
  filter: brightness(1.06);
}

.site-btn--ghost {
  background: transparent;
  color: var(--color-gold);
  border: 1px solid var(--color-gold);
  box-shadow: none;
}

.site-btn--ghost:hover,
.site-btn--ghost:focus-visible {
  background: rgba(212, 175, 55, 0.1);
  color: var(--color-gold-bright);
  box-shadow: none;
  transform: translateY(-2px);
}

.site-btn--red {
  background: linear-gradient(135deg, var(--color-red), #A61B2E);
  color: var(--color-paper);
  box-shadow: 0 4px 18px rgba(215, 38, 61, 0.4);
}

.site-btn--red:hover,
.site-btn--red:focus-visible {
  color: var(--color-paper);
  box-shadow: 0 8px 24px rgba(215, 38, 61, 0.55);
}

/* ============ 面包屑 ============ */
.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.4rem;
  padding: 0.9rem 0;
  font-family: var(--font-heading);
  font-size: 0.86rem;
  color: rgba(245, 240, 232, 0.6);
}

.breadcrumbs__sep {
  color: rgba(212, 175, 55, 0.5);
  margin: 0 0.15rem;
}

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

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

.breadcrumbs [aria-current="page"] {
  color: var(--color-paper);
}

/* ============ 卡片与标签 ============ */
.card {
  position: relative;
  background: var(--color-indigo);
  border: 1px solid rgba(212, 175, 55, 0.22);
  border-radius: var(--radius-md);
  padding: var(--space-md);
  box-shadow: var(--shadow-card);
}

.card::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 12px;
  right: 12px;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(212, 175, 55, 0.55), transparent);
}

.card--accent {
  border-color: rgba(212, 175, 55, 0.55);
  background: linear-gradient(160deg, var(--color-indigo), rgba(10, 20, 35, 0.9));
}

.card--danger {
  border-color: rgba(215, 38, 61, 0.5);
}

.card__title {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
  color: var(--color-gold);
}

.card__body {
  font-size: 0.95rem;
  color: rgba(245, 240, 232, 0.82);
  margin-bottom: 0;
}

.tag {
  display: inline-block;
  padding: 0.22rem 0.66rem;
  font-family: var(--font-heading);
  font-size: 0.78rem;
  font-weight: 700;
  border-radius: 20px;
  border: 1px solid rgba(45, 90, 136, 0.6);
  color: rgba(245, 240, 232, 0.85);
  background: rgba(16, 42, 76, 0.6);
}

.tag--gold {
  border-color: var(--color-gold);
  color: var(--color-gold);
}

.tag--red {
  border-color: var(--color-red);
  color: #ff8b9b;
}

.tag--soft {
  background: rgba(245, 240, 232, 0.08);
  color: var(--color-paper);
}

/* ============ 数据组件 ============ */
.data-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 1rem;
}

.data-cell {
  position: relative;
  overflow: hidden;
  background: linear-gradient(145deg, var(--color-indigo), rgba(11, 29, 58, 0.85));
  border: 1px solid rgba(212, 175, 55, 0.3);
  border-radius: var(--radius-md);
  padding: 1.2rem 1rem;
}

.data-cell::after {
  content: "";
  position: absolute;
  right: -18px;
  bottom: -18px;
  width: 64px;
  height: 64px;
  border: 2px solid rgba(212, 175, 55, 0.16);
  border-radius: 50%;
}

.data-cell__label {
  display: block;
  font-family: var(--font-heading);
  font-size: 0.78rem;
  font-weight: 600;
  color: rgba(245, 240, 232, 0.6);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.data-cell__value {
  display: block;
  font-family: var(--font-mono);
  font-size: 1.7rem;
  font-weight: 700;
  color: var(--color-gold);
  line-height: 1.25;
  margin-top: 0.35rem;
}

.data-cell__unit {
  font-size: 0.85rem;
  font-weight: 400;
  color: rgba(245, 240, 232, 0.6);
  margin-left: 0.25rem;
}

.data-cell--accent {
  border-color: rgba(242, 201, 76, 0.6);
}

.data-cell--danger {
  border-color: rgba(215, 38, 61, 0.55);
}

.data-cell--danger .data-cell__value {
  color: #ff8b9b;
}

.stat {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.stat__label {
  font-family: var(--font-heading);
  font-size: 0.76rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: rgba(245, 240, 232, 0.55);
}

.stat__value {
  font-family: var(--font-mono);
  font-size: 2.2rem;
  font-weight: 700;
  line-height: 1.1;
  color: var(--color-gold);
}

/* ============ 数据表 ============ */
.table-wrap {
  overflow-x: auto;
  border: 1px solid rgba(212, 175, 55, 0.25);
  border-radius: var(--radius-md);
  background: var(--color-indigo);
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--font-mono);
  font-size: 0.95rem;
  min-width: 640px;
}

.data-table th,
.data-table td {
  padding: 0.75rem 0.9rem;
  text-align: left;
  border-bottom: 1px solid rgba(45, 90, 136, 0.35);
  white-space: nowrap;
}

.data-table th {
  background: rgba(11, 29, 58, 0.6);
  color: var(--color-gold);
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 0.82rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.data-table td {
  color: rgba(245, 240, 232, 0.9);
}

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

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

/* ============ 封面与页首 ============ */
.cover {
  position: relative;
  min-height: 100svh;
  display: flex;
  align-items: flex-end;
  padding: calc(var(--header-height) + var(--space-lg)) var(--gutter) var(--space-xl);
  background:
    radial-gradient(1200px 600px at 82% 12%, rgba(212, 175, 55, 0.18), transparent 60%),
    radial-gradient(800px 500px at 12% 88%, rgba(45, 90, 136, 0.3), transparent 55%),
    linear-gradient(160deg, var(--color-deep) 0%, var(--color-ink) 100%);
  overflow: hidden;
}

.cover::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    repeating-linear-gradient(90deg, rgba(212, 175, 55, 0.045) 0 1px, transparent 1px 56px),
    repeating-linear-gradient(0deg, rgba(212, 175, 55, 0.035) 0 1px, transparent 1px 56px);
  pointer-events: none;
}

.cover__inner {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
}

.cover__kicker {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--font-heading);
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-gold-bright);
  margin-bottom: 1.2rem;
}

.cover__kicker::before {
  content: "";
  width: 38px;
  height: 2px;
  background: var(--color-gold);
}

.cover__title {
  font-family: var(--font-heading);
  font-size: var(--fs-hero);
  font-weight: 900;
  line-height: 1.08;
  color: var(--color-paper);
  max-width: 860px;
  text-shadow: 0 4px 30px rgba(0, 0, 0, 0.4);
  margin-bottom: 1.4rem;
}

.cover__lead {
  font-family: var(--font-body);
  font-size: var(--fs-lead);
  color: rgba(245, 240, 232, 0.78);
  max-width: 560px;
  margin-bottom: 2rem;
}

.cover__rule {
  width: 100%;
  max-width: 420px;
  height: 3px;
  background: linear-gradient(90deg, var(--color-gold), transparent);
  margin-bottom: 1.4rem;
}

.cover__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: rgba(245, 240, 232, 0.7);
}

.cover__index {
  font-weight: 700;
  color: var(--color-gold);
}

.page-hero {
  padding: calc(var(--header-height) + var(--space-lg)) var(--gutter) var(--space-lg);
  background:
    radial-gradient(700px 300px at 85% 20%, rgba(212, 175, 55, 0.12), transparent 60%),
    linear-gradient(165deg, var(--color-deep), var(--color-indigo));
  border-bottom: 1px solid rgba(212, 175, 55, 0.25);
}

.page-hero__inner {
  max-width: var(--container-max);
  margin-inline: auto;
}

.page-hero__title {
  font-family: var(--font-heading);
  font-size: var(--fs-h1);
  font-weight: 800;
  margin-bottom: 0.6rem;
}

.page-hero__lead {
  color: rgba(245, 240, 232, 0.75);
  max-width: 640px;
  margin: 0;
}

/* ============ 图片占位 ============ */
.image-frame {
  position: relative;
  min-height: 200px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid rgba(212, 175, 55, 0.34);
  border-radius: var(--radius-md);
  background:
    linear-gradient(150deg, rgba(16, 42, 76, 0.9), rgba(11, 29, 58, 0.7)),
    repeating-linear-gradient(45deg, rgba(212, 175, 55, 0.07) 0 2px, transparent 2px 12px);
  overflow: hidden;
}

.image-frame::after {
  content: attr(data-label);
  display: block;
  padding: 0.5rem 0.9rem;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: rgba(212, 175, 55, 0.85);
  text-align: center;
  border: 1px dashed rgba(212, 175, 55, 0.35);
  border-radius: 6px;
  background: rgba(10, 20, 35, 0.55);
}

/* ============ 显现动效 ============ */
[data-reveal] {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.4s ease, transform 0.4s ease;
}

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

/* ============ 工具类 ============ */
.text-mono { font-family: var(--font-mono); }
.text-gold { color: var(--color-gold); }
.text-bright { color: var(--color-gold-bright); }
.text-red { color: #ff8b9b; }
.text-center { text-align: center; }
.mt-sm { margin-top: var(--space-sm); }
.mt-md { margin-top: var(--space-md); }
.mb-lg { margin-bottom: var(--space-lg); }

/* ============ 响应式 ============ */
@media (max-width: 1023px) {
  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 1rem var(--gutter) 1.4rem;
    background: rgba(10, 20, 35, 0.98);
    border-bottom: 2px solid var(--color-gold);
    box-shadow: 0 24px 46px rgba(0, 0, 0, 0.55);
    visibility: hidden;
    opacity: 0;
    transform: translateY(-10px);
    pointer-events: none;
    transition: opacity 0.28s ease, transform 0.28s ease, visibility 0.28s ease;
  }

  .site-nav[data-open] {
    visibility: visible;
    opacity: 1;
    transform: none;
    pointer-events: auto;
  }

  .site-nav__list {
    flex-direction: column;
    width: 100%;
    gap: 0;
  }

  .site-nav__link {
    display: block;
    width: 100%;
    padding: 0.82rem 0.5rem;
    font-size: 1rem;
    border-bottom: 1px solid rgba(45, 90, 136, 0.3);
    border-radius: 0;
  }

  .site-nav__cta {
    margin-top: 0.9rem;
    justify-content: center;
    width: 100%;
  }

  .site-nav-toggle {
    display: flex;
  }

  .grid__span-4,
  .grid__span-3 {
    grid-column: span 6;
  }
}

@media (max-width: 764px) {
  .site-footer__inner {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-lg) var(--space-md);
  }

  .site-footer__brand {
    grid-column: 1 / -1;
  }
}

@media (max-width: 560px) {
  .site-footer__inner {
    grid-template-columns: 1fr;
  }

  .site-footer__brand {
    grid-column: auto;
  }

  .site-footer__meta-inner {
    flex-direction: column;
    align-items: flex-start;
  }

  .grid,
  .grid__span-3,
  .grid__span-4,
  .grid__span-6,
  .grid__span-8,
  .grid__span-12 {
    grid-column: span 12;
  }

  .cover__meta {
    flex-direction: column;
    gap: 0.6rem;
  }
}

/* ============ 动效偏好 ============ */
@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;
  }

  [data-reveal] {
    opacity: 1 !important;
    transform: none !important;
  }

  .site-nav {
    transition: none;
  }
}