:root {
  --color-surface: #252327;
  --color-surface-alt: #333136;
  --color-surface-deep: #444248;
  --color-ink: #c2becb;
  --color-ink-soft: #938ca1;
  --color-ink-muted: #7b738c;
  --color-line: #413f45;
  --color-primary: #825ad2;
  --color-primary-ink: #ffffff;
  --color-primary-soft: #322b3f;
  --color-accent: #97ed12;
  --color-accent-ink: #131118;
  --color-highlight: #3a4723;
  --color-focus: #99fa05;
  --color-contrast-surface: #f5f4f6;
  --color-contrast-ink: #37353b;
  --color-contrast-line: #cbcacd;
  --color-contrast-accent: #4e7b09;
  --overlay-scrim: linear-gradient(180deg, rgba(245, 244, 246, 0.35) 0%, rgba(245, 244, 246, 0.72) 55%, rgba(245, 244, 246, 0.92) 100%);
  --font-heading: "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei", "Source Han Sans SC", sans-serif;
  --font-body: "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei", "Source Han Sans SC", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --text-xs: 11.0px;
  --text-sm: 14.7px;
  --text-base: 17px;
  --text-lg: 22.7px;
  --text-xl: 30.2px;
  --text-2xl: 40.3px;
  --text-3xl: 53.7px;
  --text-4xl: 71.5px;
  --text-display: clamp(44px, 9.0vw, 115px);
  --text-figure: clamp(37px, 6.5vw, 83px);
  --weight-heading: 674;
  --weight-body: 400;
  --leading-body: 1.78;
  --leading-heading: 1.23;
  --tracking-heading: -0.013em;
  --radius-sm: 10px;
  --radius-md: 10px;
  --radius-lg: 11px;
  --radius-pill: 999px;
  --border-thin: 1px;
  --border-thick: 2px;
  --shadow-1: 0 0 0 1px rgba(151, 237, 18, 0.35);
  --shadow-2: 0 0 28px rgba(151, 237, 18, 0.35);
  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --space-6: 48px;
  --space-8: 64px;
  --container: 1200px;
  --measure: 66ch;
  --gutter: 24px;
  --section-y: 77px;
  --section-y-lg: 108px;
}

/* ==========================================================================
   诺亚体育 · /assets/site.css
   01 reset  02 基线排版  03 通用布局  04 头部  05 页脚
   06 组件  07 图片容器  08 动效  09 响应式
   ========================================================================== */

/* ---------- 01 reset ---------- */
*, *::before, *::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 120px;
}

body, h1, h2, h3, h4, h5, h6, p, figure, blockquote, dl, dd, ul, ol, pre { margin: 0; }
ul[class], ol[class] { padding: 0; list-style: none; }
img, svg, video { display: block; max-width: 100%; }
img { height: auto; border: 0; }
button, input, select, textarea { font: inherit; color: inherit; }
button { background: none; border: 0; padding: 0; cursor: pointer; }
a { color: inherit; text-decoration: none; }
table { border-collapse: collapse; border-spacing: 0; }
hr { border: 0; margin: 0; }
[hidden] { display: none !important; }

/* ---------- 02 基线排版 ---------- */
body {
  min-height: 100vh;
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: var(--weight-body);
  line-height: var(--leading-body);
  color: var(--color-ink);
  background-color: var(--color-surface);
  background-image:
    radial-gradient(960px 520px at 8% -8%, color-mix(in srgb, var(--color-primary) 20%, transparent), transparent 66%),
    radial-gradient(760px 430px at 96% 0%, color-mix(in srgb, var(--color-accent) 7%, transparent), transparent 70%);
  background-repeat: no-repeat;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: color-mix(in srgb, var(--color-ink) 58%, var(--color-primary-ink));
  text-wrap: balance;
}

h1 { font-size: var(--text-2xl); }
h2 { font-size: var(--text-xl); }
h3 { font-size: var(--text-lg); }
h4 { font-size: var(--text-base); }

p { max-width: var(--measure); }
p + p { margin-top: var(--space-2); }

strong, b { font-weight: var(--weight-heading); color: color-mix(in srgb, var(--color-ink) 45%, var(--color-primary-ink)); }
small { font-size: var(--text-sm); color: var(--color-ink-muted); }

::selection {
  background: var(--color-accent);
  color: var(--color-accent-ink);
}

:focus-visible {
  outline: var(--border-thick) solid var(--color-focus);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

/* ---------- 03 通用布局 ---------- */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section { padding-block: var(--section-y); }
.section--lg { padding-block: var(--section-y-lg); }
.section--tight { padding-block: var(--space-6); }

main { display: block; }
#main-content { display: block; }

.grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: var(--gutter);
}

.span-3 { grid-column: span 3; }
.span-4 { grid-column: span 4; }
.span-5 { grid-column: span 5; }
.span-6 { grid-column: span 6; }
.span-7 { grid-column: span 7; }
.span-8 { grid-column: span 8; }
.span-9 { grid-column: span 9; }
.span-12 { grid-column: span 12; }

.rule-dotted {
  width: 100%;
  height: 0;
  border-top: var(--border-thick) dotted var(--color-line);
}

.rule-dashed {
  width: 100%;
  height: 0;
  border-top: var(--border-thin) dashed var(--color-line);
}

.contrast {
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
}

.contrast h1, .contrast h2, .contrast h3, .contrast h4 {
  color: var(--color-contrast-ink);
}

.contrast p, .contrast li { color: color-mix(in srgb, var(--color-contrast-ink) 86%, transparent); }

/* ---------- 04 头部：悬浮胶囊浮岛 ---------- */
.skip-link {
  position: fixed;
  z-index: 400;
  left: var(--space-4);
  top: var(--space-4);
  padding: 10px 18px;
  border-radius: var(--radius-pill);
  background: var(--color-accent);
  color: var(--color-accent-ink);
  font-size: var(--text-sm);
  font-weight: var(--weight-heading);
  transform: translateY(calc(-100% - 80px));
  transition: transform 160ms ease;
}
.skip-link:focus { transform: translateY(0); }

.site-header {
  position: sticky;
  top: 0;
  z-index: 120;
  padding: var(--space-3) 0 var(--space-2);
}

.site-header__inner {
  position: relative;
  display: flex;
  align-items: center;
  gap: var(--space-3);
  width: min(var(--container), calc(100% - var(--gutter) * 2));
  margin-inline: auto;
  padding: var(--space-1) var(--space-2) var(--space-1) var(--space-3);
  border: var(--border-thin) solid color-mix(in srgb, var(--color-primary) 42%, transparent);
  border-radius: var(--radius-pill);
  background: color-mix(in srgb, var(--color-surface-alt) 80%, transparent);
  -webkit-backdrop-filter: blur(18px) saturate(140%);
  backdrop-filter: blur(18px) saturate(140%);
  box-shadow: var(--shadow-1);
  transition: background-color 220ms ease, border-color 220ms ease, box-shadow 220ms ease;
}

.site-header[data-stuck] .site-header__inner {
  background: color-mix(in srgb, var(--color-surface-alt) 96%, transparent);
  border-color: color-mix(in srgb, var(--color-primary) 62%, transparent);
  box-shadow: var(--shadow-1), var(--shadow-2);
}

/* 品牌 */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-right: auto;
  min-width: 0;
  padding: 4px;
  border-radius: var(--radius-pill);
}

.brand__mark {
  position: relative;
  flex: none;
  width: 26px;
  height: 26px;
  border-radius: 8px;
  background: linear-gradient(140deg, var(--color-accent), var(--color-primary));
  box-shadow: 0 0 14px color-mix(in srgb, var(--color-accent) 45%, transparent);
}

.brand__mark::after {
  content: "";
  position: absolute;
  inset: 7px;
  border-radius: 2px;
  background: var(--color-surface);
  opacity: 0.62;
}

.brand__text { display: flex; flex-direction: column; min-width: 0; }

.brand__name {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-base);
  line-height: 1.2;
  letter-spacing: 0.02em;
  color: color-mix(in srgb, var(--color-ink) 45%, var(--color-primary-ink));
}

.brand__tag {
  font-size: var(--text-xs);
  line-height: 1.4;
  letter-spacing: 0.06em;
  color: var(--color-ink-muted);
  white-space: nowrap;
}

/* 主导航 */
.site-nav { display: flex; }

.site-nav__list {
  display: flex;
  align-items: center;
  gap: 2px;
}

.site-nav__list a {
  position: relative;
  display: inline-block;
  padding: 9px 14px 11px;
  border-radius: var(--radius-sm);
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
  white-space: nowrap;
  transition: color 160ms ease, background-color 160ms ease;
}

.site-nav__list a::after {
  content: "";
  position: absolute;
  left: 14px;
  right: 14px;
  bottom: 4px;
  height: 2px;
  border-radius: 2px;
  background: var(--color-accent);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 180ms ease;
}

.site-nav__list a:hover {
  color: color-mix(in srgb, var(--color-ink) 55%, var(--color-primary-ink));
  background: var(--color-primary-soft);
}

.site-nav__list a:hover::after { transform: scaleX(1); }

.site-nav__list a[aria-current="page"] {
  color: var(--color-accent);
}

.site-nav__list a[aria-current="page"]::after { transform: scaleX(1); }

.site-header__cta { flex: none; }

/* 移动导航按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 8px;
  flex: none;
  padding: 9px 14px;
  border: var(--border-thin) solid color-mix(in srgb, var(--color-primary) 45%, transparent);
  border-radius: var(--radius-pill);
  color: var(--color-ink);
  font-size: var(--text-sm);
  transition: border-color 160ms ease, color 160ms ease;
}

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

.nav-toggle__bars {
  position: relative;
  flex: none;
  width: 16px;
  height: 2px;
  border-radius: 2px;
  background: var(--color-accent);
}

.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 16px;
  height: 2px;
  border-radius: 2px;
  background: var(--color-accent);
  transition: transform 180ms ease, top 180ms ease, opacity 180ms ease;
}

.nav-toggle__bars::before { top: -5px; }
.nav-toggle__bars::after { top: 5px; }

.nav-toggle[aria-expanded="true"] .nav-toggle__bars { background: transparent; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before { top: 0; transform: rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after { top: 0; transform: rotate(-45deg); }

/* ---------- 05 页脚：反色收束层 ---------- */
.site-footer {
  margin-top: var(--section-y-lg);
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border-top: var(--border-thick) dotted var(--color-contrast-line);
}

.site-footer__inner {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 2.1fr) minmax(0, 1.35fr);
  gap: var(--space-6);
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding: var(--section-y) var(--gutter) var(--space-8);
}

.site-footer__brand { min-width: 0; }

.site-footer__name {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-lg);
  line-height: 1.2;
  letter-spacing: var(--tracking-heading);
  color: var(--color-contrast-ink);
}

.site-footer__tagline {
  margin-top: 6px;
  font-size: var(--text-sm);
  color: color-mix(in srgb, var(--color-contrast-ink) 78%, transparent);
  max-width: none;
}

.site-footer__meta {
  margin-top: var(--space-3);
  padding-top: var(--space-2);
  border-top: var(--border-thin) dashed var(--color-contrast-line);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  color: var(--color-contrast-accent);
  max-width: none;
}

.site-footer__nav {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-4);
}

.site-footer__col-title {
  font-family: var(--font-heading);
  font-size: var(--text-xs);
  font-weight: var(--weight-heading);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: color-mix(in srgb, var(--color-contrast-ink) 58%, transparent);
  margin-bottom: var(--space-2);
}

.site-footer__list li + li { margin-top: 6px; }

.site-footer__list a {
  display: inline-block;
  padding: 2px 0;
  font-size: var(--text-sm);
  color: color-mix(in srgb, var(--color-contrast-ink) 88%, transparent);
  border-bottom: var(--border-thin) dashed transparent;
  transition: color 160ms ease, border-color 160ms ease;
}

.site-footer__list a:hover {
  color: var(--color-contrast-accent);
  border-bottom-color: var(--color-contrast-accent);
}

.site-footer__contact-list {
  display: grid;
  gap: 9px;
}

.site-footer__contact-list li {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 10px;
  align-items: baseline;
}

.site-footer__label {
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  color: color-mix(in srgb, var(--color-contrast-ink) 55%, transparent);
}

.site-footer__value {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-contrast-ink);
  word-break: break-word;
}

.site-footer__note {
  margin-top: var(--space-3);
  padding-top: var(--space-2);
  border-top: var(--border-thin) dashed var(--color-contrast-line);
  font-size: var(--text-xs);
  line-height: 1.7;
  color: color-mix(in srgb, var(--color-contrast-ink) 66%, transparent);
  max-width: none;
}

.site-footer__bottom {
  border-top: var(--border-thin) dotted var(--color-contrast-line);
}

.site-footer__bottom-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding: var(--space-3) var(--gutter) var(--space-4);
}

.site-footer__copy,
.site-footer__icp {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.04em;
  color: color-mix(in srgb, var(--color-contrast-ink) 60%, transparent);
  max-width: none;
}

/* ---------- 06 组件 ---------- */
/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-1);
  padding: 11px 20px;
  border: var(--border-thin) solid transparent;
  border-radius: var(--radius-pill);
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  font-weight: var(--weight-heading);
  letter-spacing: 0.02em;
  line-height: 1.3;
  white-space: nowrap;
  transition: background-color 160ms ease, color 160ms ease, border-color 160ms ease, box-shadow 160ms ease;
}

.btn--accent {
  background: var(--color-accent);
  color: var(--color-accent-ink);
  box-shadow: 0 0 0 1px color-mix(in srgb, var(--color-accent) 60%, transparent), 0 0 18px color-mix(in srgb, var(--color-accent) 26%, transparent);
}

.btn--accent:hover {
  background: color-mix(in srgb, var(--color-accent) 84%, var(--color-primary-ink));
}

.btn--primary {
  background: var(--color-primary);
  color: var(--color-primary-ink);
}

.btn--primary:hover {
  background: color-mix(in srgb, var(--color-primary) 84%, var(--color-primary-ink));
}

.btn--ghost {
  background: transparent;
  color: var(--color-ink);
  border-color: color-mix(in srgb, var(--color-primary) 52%, transparent);
}

.btn--ghost:hover {
  background: var(--color-primary-soft);
  border-color: var(--color-accent);
  color: color-mix(in srgb, var(--color-ink) 32%, var(--color-primary-ink));
}

/* 标签与芯片 */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-accent);
}

.eyebrow::before {
  content: "";
  width: 22px;
  height: var(--border-thin);
  background: currentColor;
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 11px;
  border: var(--border-thin) solid color-mix(in srgb, var(--color-primary) 42%, transparent);
  border-radius: var(--radius-pill);
  background: var(--color-primary-soft);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-ink-soft);
}

.chip--accent {
  background: transparent;
  border-color: color-mix(in srgb, var(--color-accent) 52%, transparent);
  color: var(--color-accent);
}

/* 面板 */
.panel {
  position: relative;
  padding: var(--space-4);
  background: color-mix(in srgb, var(--color-surface-alt) 90%, transparent);
  border: var(--border-thin) solid color-mix(in srgb, var(--color-primary) 36%, transparent);
  border-radius: var(--radius-md);
}

.panel--glow { box-shadow: var(--shadow-1), var(--shadow-2); }
.panel--flush { padding: 0; overflow: hidden; }
.panel--deep { background: color-mix(in srgb, var(--color-surface-deep) 88%, transparent); }

@keyframes panel-breath {
  0%, 100% {
    box-shadow: 0 0 0 1px color-mix(in srgb, var(--color-accent) 22%, transparent),
                0 0 14px color-mix(in srgb, var(--color-accent) 12%, transparent);
  }
  50% {
    box-shadow: 0 0 0 1px color-mix(in srgb, var(--color-accent) 42%, transparent),
                0 0 30px color-mix(in srgb, var(--color-accent) 26%, transparent);
  }
}

.panel--pulse {
  animation: panel-breath 2.4s ease-in-out infinite;
  border-color: color-mix(in srgb, var(--color-accent) 34%, transparent);
}

/* 斜切条 */
.slant-strip {
  padding: var(--space-2) var(--space-4);
  background: var(--color-primary-soft);
  border-left: var(--border-thick) solid var(--color-accent);
  clip-path: polygon(0 0, 100% 0, calc(100% - 16px) 100%, 0 100%);
}

.slant-strip--solid {
  background: var(--color-highlight);
  border-left-color: var(--color-accent);
}

/* 章节头 + 超大编号 */
.section-head {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: var(--space-2) var(--space-3);
  padding-bottom: var(--space-3);
  margin-bottom: var(--space-6);
  border-bottom: var(--border-thin) dashed var(--color-line);
}

.section-head__index {
  flex: none;
  font-family: var(--font-mono);
  font-size: var(--text-4xl);
  line-height: 0.9;
  letter-spacing: -0.05em;
  color: color-mix(in srgb, var(--color-primary) 66%, transparent);
}

.section-head__title {
  font-size: var(--text-lg);
  line-height: 1.25;
}

.section-head__note {
  margin-left: auto;
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
  max-width: 34ch;
}

/* 数值 */
.num, .mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.01em;
}

.display {
  font-family: var(--font-heading);
  font-size: var(--text-display);
  font-weight: var(--weight-heading);
  line-height: 1.02;
  letter-spacing: -0.032em;
  color: color-mix(in srgb, var(--color-ink) 42%, var(--color-primary-ink));
}

.figure {
  font-family: var(--font-mono);
  font-size: var(--text-figure);
  font-weight: var(--weight-heading);
  line-height: 1;
  letter-spacing: -0.04em;
  color: var(--color-accent);
  font-variant-numeric: tabular-nums;
}

.stat {
  display: flex;
  flex-direction: column;
  gap: 5px;
  min-width: 0;
}

.stat__value {
  font-family: var(--font-mono);
  font-size: var(--text-xl);
  line-height: 1.05;
  color: var(--color-accent);
  font-variant-numeric: tabular-nums;
}

.stat__label {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-ink-muted);
}

.stat__note {
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
  max-width: none;
}

/* 数据表 */
.data-table {
  width: 100%;
  font-size: var(--text-sm);
}

.data-table caption {
  caption-side: top;
  padding: var(--space-2) var(--space-3);
  text-align: left;
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-ink-muted);
}

.data-table th {
  padding: 11px var(--space-3);
  text-align: left;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: var(--weight-heading);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-ink-soft);
  background: color-mix(in srgb, var(--color-surface-alt) 88%, transparent);
  border-bottom: var(--border-thin) dashed var(--color-line);
}

.data-table td {
  padding: 13px var(--space-3);
  color: var(--color-ink);
  border-bottom: var(--border-thin) dotted var(--color-line);
  vertical-align: top;
}

.data-table tbody tr { transition: background-color 140ms ease; }

.data-table tbody tr:hover td { background: var(--color-primary-soft); }

.data-table tbody tr[data-selected] td { background: var(--color-primary-soft); }

.data-table tbody tr.is-highlight td {
  background: var(--color-highlight);
  color: color-mix(in srgb, var(--color-ink) 40%, var(--color-primary-ink));
}

.data-table th.num,
.data-table td.num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  text-align: right;
  color: var(--color-accent);
}

.data-table th.num { color: var(--color-ink-soft); }

/* 分段切换 */
.segmented {
  display: inline-flex;
  flex-wrap: wrap;
  gap: 4px;
  padding: 4px;
  background: color-mix(in srgb, var(--color-surface-alt) 90%, transparent);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-pill);
}

.segmented [role="tab"] {
  padding: 8px 16px;
  border-radius: var(--radius-pill);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-ink-soft);
  transition: background-color 160ms ease, color 160ms ease;
}

.segmented [role="tab"]:hover { color: var(--color-ink); background: var(--color-primary-soft); }

.segmented [role="tab"][aria-selected="true"] {
  background: var(--color-primary);
  color: var(--color-primary-ink);
}

[role="tabpanel"]:focus-visible { outline-offset: 4px; }

/* 面包屑 */
.breadcrumb {
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
}

.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}

.breadcrumb li { display: inline-flex; align-items: center; gap: 8px; }

.breadcrumb li + li::before {
  content: "/";
  color: var(--color-line);
  font-family: var(--font-mono);
}

.breadcrumb a {
  color: var(--color-ink-soft);
  border-bottom: var(--border-thin) dashed transparent;
  transition: color 160ms ease, border-color 160ms ease;
}

.breadcrumb a:hover {
  color: var(--color-accent);
  border-bottom-color: var(--color-accent);
}

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

/* 复制编号 */
.copy-id {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 10px;
  border: var(--border-thin) dashed color-mix(in srgb, var(--color-primary) 52%, transparent);
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  color: var(--color-ink-soft);
  transition: border-color 160ms ease, color 160ms ease;
}

.copy-id:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

/* ---------- 07 图片容器 ---------- */
.media-frame {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  background: var(--color-surface-alt);
  border: var(--border-thin) solid color-mix(in srgb, var(--color-primary) 28%, transparent);
  border-radius: var(--radius-md);
}

.media-frame--4x3 { aspect-ratio: 4 / 3; }
.media-frame--3x2 { aspect-ratio: 3 / 2; }
.media-frame--1x1 { aspect-ratio: 1 / 1; }
.media-frame--21x9 { aspect-ratio: 21 / 9; }

.media-frame > img,
.media-frame > picture > img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.88) contrast(1.06) brightness(0.84);
}

.media-frame__caption {
  position: absolute;
  inset: auto 0 0 0;
  padding: var(--space-3) var(--space-3) var(--space-2);
  background: var(--overlay-scrim);
  color: var(--color-contrast-ink);
  font-size: var(--text-xs);
  line-height: 1.6;
  letter-spacing: 0.04em;
}

.media-frame__tag {
  position: absolute;
  top: 10px;
  left: 10px;
  z-index: 2;
  padding: 3px 10px;
  border-radius: var(--radius-pill);
  background: var(--color-accent);
  color: var(--color-accent-ink);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
}

.media-frame--placeholder {
  display: grid;
  place-items: center;
  border-style: dashed;
  border-color: color-mix(in srgb, var(--color-primary) 40%, transparent);
  background-image: repeating-linear-gradient(
    135deg,
    color-mix(in srgb, var(--color-surface-deep) 60%, transparent) 0 8px,
    transparent 8px 16px
  );
}

.media-frame--placeholder::after {
  content: "图像待置入";
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.16em;
  color: var(--color-ink-muted);
}

/* ---------- 08 动效 ---------- */
html.js [data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 200ms ease, transform 220ms cubic-bezier(0.2, 0.7, 0.3, 1);
  will-change: opacity, transform;
}

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

.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 300;
  height: 2px;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
  pointer-events: none;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
  html.js [data-reveal] { opacity: 1 !important; transform: none !important; }
  .panel--pulse { animation: none; box-shadow: var(--shadow-1); }
  .scroll-progress { transition: none; }
}

/* ---------- 09 响应式 ---------- */
@media (max-width: 1100px) {
  .site-footer__inner {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.6fr);
    gap: var(--space-6);
  }
  .site-footer__contact { grid-column: 1 / -1; }
}

@media (max-width: 1024px) {
  .span-3, .span-4, .span-5 { grid-column: span 6; }
  .span-7, .span-8, .span-9 { grid-column: span 12; }

  .brand__tag { display: none; }
}

@media (max-width: 960px) {
  .site-header { padding: var(--space-2) 0; }

  .site-header__inner {
    border-radius: var(--radius-lg);
    padding: var(--space-2) var(--space-2) var(--space-2) var(--space-3);
  }

  .site-header__cta { display: none; }

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

  .site-nav {
    position: absolute;
    top: calc(100% + 10px);
    left: 0;
    right: 0;
    display: none;
    padding: var(--space-2);
    border: var(--border-thin) solid color-mix(in srgb, var(--color-primary) 48%, transparent);
    border-radius: var(--radius-lg);
    background: color-mix(in srgb, var(--color-surface-deep) 94%, transparent);
    -webkit-backdrop-filter: blur(18px) saturate(140%);
    backdrop-filter: blur(18px) saturate(140%);
    box-shadow: var(--shadow-2);
  }

  .site-nav[data-open] { display: block; }

  .site-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
  }

  .site-nav__list a {
    display: block;
    padding: 12px 14px;
    font-size: var(--text-base);
    border-radius: var(--radius-sm);
  }

  .site-nav__list a::after {
    left: 14px;
    right: auto;
    bottom: 8px;
    width: 20px;
  }

  .section-head__note { margin-left: 0; max-width: none; }
}

@media (max-width: 860px) {
  .site-footer__inner {
    grid-template-columns: minmax(0, 1fr);
    padding-bottom: var(--space-6);
  }
  .site-footer__contact { grid-column: auto; }
  .site-footer__nav { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

@media (max-width: 720px) {
  :root { --gutter: 16px; }

  .span-3, .span-4, .span-5, .span-6, .span-7, .span-8, .span-9 { grid-column: span 12; }

  .section-head__index { font-size: var(--text-3xl); }

  .site-footer__nav { grid-template-columns: repeat(2, minmax(0, 1fr)); }

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

  .panel { padding: var(--space-3); }
  .panel--flush { padding: 0; }

  .data-table th,
  .data-table td { padding: 10px var(--space-2); }
}

@media (max-width: 480px) {
  .brand__text { display: none; }
  .nav-toggle__label { display: none; }
  .site-footer__nav { grid-template-columns: minmax(0, 1fr); }
}