/* =========================================================
   易倍体育主站 · /assets/site.css
   共享层：reset / tokens / 中文排版 / 框架头尾 / 通用组件
   ========================================================= */

/* ---------- 0. Reset ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

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

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

ul, ol { padding: 0; list-style: none; }

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

a { color: inherit; text-decoration: none; }

button {
  font: inherit;
  color: inherit;
  background: none;
  border: 0;
  padding: 0;
  cursor: pointer;
}

table { border-collapse: collapse; width: 100%; }

/* ---------- 1. Design tokens ---------- */
:root {
  /* 品牌原色 */
  --ink: #0C2B24;
  --ink-2: #16443A;
  --paper: #F5EFE2;
  --paper-2: #E3DAC8;
  --signal: #FF6A1A;
  --cyan: #3BF0C6;
  --report: #B9B1A0;
  --black: #191D1B;
  --mute: #6C736D;
  --white: #FBFAF6;

  /* 语义色（页面阶段只允许引用这一层） */
  --canvas: var(--ink);
  --canvas-2: var(--ink-2);
  --canvas-veil: rgba(12, 43, 36, 0.94);
  --on-canvas: var(--white);
  --on-canvas-mute: rgba(251, 250, 246, 0.64);
  --edge: rgba(251, 250, 246, 0.18);
  --edge-strong: rgba(251, 250, 246, 0.34);
  --surface: var(--paper);
  --surface-2: var(--paper-2);
  --on-surface: var(--black);
  --on-surface-mute: var(--mute);

  /* 尺度 */
  --rail-w: 68px;
  --radius: 2px;
  --shadow-paper: 4px 4px 0 0 rgba(12, 43, 36, 0.55);
  --shadow-paper-light: 4px 4px 0 0 rgba(227, 218, 200, 0.16);

  /* 字体 */
  --font-body: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  --font-num: ui-monospace, SFMono-Regular, Menlo, Consolas,
    "Liberation Mono", monospace;

  --ease: cubic-bezier(0.2, 0.7, 0.3, 1);
}

/* 纸面阅读模式（由头部按钮切换，页面请只使用语义变量） */
:root[data-theme="paper"] {
  --canvas: #F5EFE2;
  --canvas-2: #E3DAC8;
  --canvas-veil: rgba(245, 239, 226, 0.95);
  --on-canvas: #191D1B;
  --on-canvas-mute: #5C635E;
  --edge: rgba(25, 29, 27, 0.22);
  --edge-strong: rgba(25, 29, 27, 0.4);
  --shadow-paper: 4px 4px 0 0 rgba(25, 29, 27, 0.18);
  --shadow-paper-light: 4px 4px 0 0 rgba(25, 29, 27, 0.1);
}

/* ---------- 2. Base & 中文排版 ---------- */
body {
  background: var(--canvas);
  color: var(--on-canvas);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.75;
  letter-spacing: 0.01em;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

@media (min-width: 1080px) {
  body { padding-left: var(--rail-w); }
}

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

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

h1, h2, h3, h4 {
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: -0.012em;
  text-wrap: balance;
}

p { text-wrap: pretty; }

.display {
  font-weight: 900;
  font-size: clamp(32px, 4.6vw, 56px);
  line-height: 1.05;
  letter-spacing: -0.02em;
}

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

.kicker {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.22em;
  color: var(--on-canvas-mute);
}

.kicker::before {
  content: "";
  width: 18px;
  height: 2px;
  background: var(--signal);
}

.visually-hidden {
  position: absolute !important;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 300;
  padding: 10px 18px;
  background: var(--signal);
  color: var(--ink);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.12em;
  border-radius: var(--radius);
  transform: translateY(-240%);
  transition: transform 0.2s var(--ease);
}

.skip-link:focus {
  transform: translateY(0);
}

/* ---------- 3. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 16px;
  border: 1px solid transparent;
  border-radius: var(--radius);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.12em;
  line-height: 1.2;
  white-space: nowrap;
  transition: background-color 0.2s var(--ease), color 0.2s var(--ease),
    border-color 0.2s var(--ease), transform 0.2s var(--ease);
}

.btn:active { transform: translateY(1px); }

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

.btn-signal:hover { background: #FF8340; border-color: #FF8340; }

.btn-ghost {
  border-color: var(--edge-strong);
  color: var(--on-canvas);
  background: transparent;
}

.btn-ghost:hover {
  border-color: var(--signal);
  color: var(--signal);
}

.btn-outline {
  border-color: var(--edge-strong);
  color: var(--on-canvas);
  background: transparent;
}

.btn-outline:hover {
  background: var(--signal);
  border-color: var(--signal);
  color: var(--ink);
}

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

.btn-ink:hover { background: var(--ink-2); border-color: var(--ink-2); }

/* ---------- 4. 头部：框架式导航 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 80;
  background: var(--canvas-veil);
  border-bottom: 1px solid var(--edge);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
}

/* 左侧刻度边线：与顶部边线构成 90° 框架 */
.edge-rail { display: none; }

@media (min-width: 1080px) {
  .edge-rail {
    display: flex;
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    width: var(--rail-w);
    z-index: 90;
    flex-direction: column;
    align-items: center;
    justify-content: space-between;
    gap: 14px;
    padding: 16px 0 18px;
    background: linear-gradient(180deg, var(--canvas-2), var(--canvas));
    border-right: 1px solid var(--edge);
    pointer-events: none;
  }
}

.rail-mark {
  display: grid;
  place-items: center;
  width: 30px;
  height: 30px;
  background: var(--signal);
  color: var(--ink);
  font-size: 15px;
  font-weight: 900;
  clip-path: polygon(0 0, 100% 0, 100% 70%, 70% 100%, 0 100%);
}

.rail-ticks {
  flex: 1 1 auto;
  width: 100%;
  background-image: repeating-linear-gradient(
    to bottom,
    var(--edge) 0,
    var(--edge) 1px,
    transparent 1px,
    transparent 14px
  );
  background-size: 16px 100%;
  background-position: center top;
  background-repeat: repeat-y;
}

.rail-live {
  display: flex;
  align-items: center;
  gap: 8px;
  writing-mode: vertical-rl;
  font-family: var(--font-num);
  font-size: 10px;
  letter-spacing: 0.24em;
  color: var(--cyan);
}

.dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 3px rgba(59, 240, 198, 0.18);
  animation: eb-breathe 1.2s ease-in-out infinite;
}

@keyframes eb-breathe {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.45; transform: scale(0.82); }
}

.rail-caption {
  writing-mode: vertical-rl;
  text-orientation: mixed;
  font-size: 10px;
  letter-spacing: 0.32em;
  color: var(--on-canvas-mute);
}

.header-inner {
  max-width: 1560px;
  margin-inline: auto;
  padding-inline: clamp(16px, 3vw, 40px);
}

.header-bar {
  display: flex;
  align-items: center;
  gap: clamp(10px, 2vw, 28px);
  min-height: 66px;
  padding-block: 10px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  flex: 0 0 auto;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  background: var(--signal);
  color: var(--ink);
  font-size: 19px;
  font-weight: 900;
  line-height: 1;
  clip-path: polygon(0 0, 100% 0, 100% 72%, 72% 100%, 0 100%);
}

.brand-copy { display: grid; gap: 1px; }

.brand-name {
  display: block;
  font-size: 19px;
  font-weight: 900;
  letter-spacing: 0.04em;
  line-height: 1.2;
}

.brand-line {
  display: block;
  font-size: 10.5px;
  letter-spacing: 0.18em;
  line-height: 1.4;
  color: var(--on-canvas-mute);
}

.header-micro {
  margin-left: auto;
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--on-canvas-mute);
  white-space: nowrap;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.fav-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 14px;
  border: 1px dashed var(--edge-strong);
  border-radius: var(--radius);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--on-canvas-mute);
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.fav-btn:hover { color: var(--on-canvas); border-color: var(--signal); }

.fav-btn[aria-pressed="true"] {
  color: var(--cyan);
  border-style: solid;
  border-color: var(--cyan);
}

.fav-dot {
  width: 8px;
  height: 8px;
  border: 1.5px solid currentColor;
  transform: rotate(45deg);
  transition: background-color 0.2s var(--ease);
}

.fav-btn[aria-pressed="true"] .fav-dot { background: var(--cyan); }

.theme-btn {
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  border: 1px solid var(--edge-strong);
  border-radius: 50%;
  transition: border-color 0.2s var(--ease);
}

.theme-btn:hover { border-color: var(--cyan); }

.theme-glyph {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  border: 1px solid currentColor;
  background: linear-gradient(90deg, currentColor 0 50%, transparent 50% 100%);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 42px;
  height: 38px;
  padding-inline: 9px;
  border: 1px solid var(--edge-strong);
  border-radius: var(--radius);
  transition: border-color 0.2s var(--ease);
}

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

.nav-toggle-bar {
  display: block;
  height: 2px;
  width: 100%;
  background: var(--on-canvas);
  transition: transform 0.25s var(--ease), opacity 0.2s var(--ease);
}

.site-header[data-open] .nav-toggle-bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.site-header[data-open] .nav-toggle-bar:nth-child(2) { opacity: 0; }

.site-header[data-open] .nav-toggle-bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* 导航贴在框架边线上 */
.site-nav {
  border-top: 1px solid var(--edge);
}

.nav-list {
  display: flex;
  flex-wrap: wrap;
  gap: 2px;
}

.nav-item { display: block; }

.nav-link {
  position: relative;
  display: block;
  padding: 9px 14px 11px;
  font-size: 12.5px;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--on-canvas-mute);
  transition: color 0.2s var(--ease), transform 0.2s var(--ease),
    background-color 0.2s var(--ease);
}

.nav-link::before {
  content: attr(data-index);
  font-family: var(--font-num);
  font-size: 9.5px;
  font-weight: 400;
  letter-spacing: 0;
  color: var(--cyan);
  opacity: 0.5;
  margin-right: 7px;
  vertical-align: 2px;
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 12px;
  right: 12px;
  bottom: -1px;
  height: 2px;
  background: var(--signal);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.25s var(--ease);
}

.nav-link:hover,
.nav-link:focus-visible {
  color: var(--on-canvas);
  transform: translateX(-8px);
}

.nav-link:hover::after,
.nav-link:focus-visible::after { transform: scaleX(1); }

.nav-link[aria-current="page"] {
  color: var(--on-canvas);
  background: var(--canvas-2);
}

.nav-link[aria-current="page"]::before { opacity: 1; }

.nav-link[aria-current="page"]::after { transform: scaleX(1); }

/* 滚动进度：橙色到青色 */
.header-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  pointer-events: none;
}

.progress-fill {
  display: block;
  height: 100%;
  width: 100%;
  transform: scaleX(var(--p, 0));
  transform-origin: left center;
  background: linear-gradient(90deg, var(--signal), var(--cyan));
  transition: transform 0.15s linear;
}

/* ---------- 5. 头部响应式 ---------- */
@media (max-width: 1080px) {
  .header-micro { display: none; }
}

@media (max-width: 900px) {
  .header-bar { min-height: 62px; }
  .brand-line { display: none; }
  .brand-name { font-size: 17px; }
  .nav-toggle { display: flex; }

  .site-nav {
    max-height: 0;
    overflow: hidden;
    border-top: 0;
    transition: max-height 0.32s var(--ease);
  }

  .site-header[data-open] .site-nav {
    max-height: 80vh;
    overflow-y: auto;
    border-top: 1px solid var(--edge);
    background: var(--canvas-2);
  }

  .nav-list { flex-direction: column; padding: 4px 0 12px; }

  .nav-item { border-bottom: 1px solid var(--edge); }
  .nav-item:last-child { border-bottom: 0; }

  .nav-link {
    padding: 14px 4px;
    font-size: 15px;
    letter-spacing: 0.14em;
  }

  .nav-link:hover,
  .nav-link:focus-visible { transform: none; }

  .nav-link::after { left: 0; right: 0; bottom: 0; }

  .nav-link[aria-current="page"] {
    background: transparent;
    box-shadow: inset 3px 0 0 var(--signal);
  }
}

@media (max-width: 620px) {
  .btn-ghost,
  .fav-btn,
  .theme-btn { display: none; }
}

@media (max-width: 480px) {
  .btn-signal { display: none; }
  .header-actions { gap: 6px; }
}

/* ---------- 6. 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(56px, 8vw, 120px);
  background: var(--canvas-2);
  color: var(--on-canvas);
  border-top: 1px solid var(--edge);
}

.site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(
    90deg,
    var(--signal) 0 32%,
    var(--cyan) 32% 38%,
    transparent 38%
  );
}

.footer-frame {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(0, 2fr) minmax(0, 1.05fr);
  gap: clamp(28px, 4vw, 64px);
  max-width: 1360px;
  margin-inline: auto;
  padding: clamp(40px, 6vw, 72px) clamp(16px, 3vw, 40px)
    clamp(32px, 4vw, 56px);
}

.footer-kicker {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.3em;
  color: var(--signal);
}

.footer-name {
  margin-top: 10px;
  font-size: clamp(24px, 2.6vw, 32px);
  font-weight: 900;
  line-height: 1.1;
  letter-spacing: -0.01em;
}

.footer-desc {
  margin-top: 12px;
  max-width: 32ch;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--on-canvas-mute);
}

.footer-brand .btn { margin-top: 20px; }

.footer-nav {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 24px;
}

.footer-col-title {
  position: relative;
  margin-bottom: 14px;
  padding-bottom: 10px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.2em;
  color: var(--on-canvas);
  border-bottom: 1px solid var(--edge);
}

.footer-col-title::before {
  content: "";
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 22px;
  height: 2px;
  background: var(--signal);
}

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

.footer-link {
  display: inline-block;
  font-size: 14.5px;
  color: var(--on-canvas-mute);
  transition: color 0.2s var(--ease), transform 0.2s var(--ease);
}

.footer-link:hover,
.footer-link:focus-visible {
  color: var(--cyan);
  transform: translateX(4px);
}

.footer-meta { display: grid; gap: 12px; }

.footer-meta li { display: grid; gap: 2px; }

.footer-meta-label {
  font-size: 10.5px;
  letter-spacing: 0.2em;
  color: var(--on-canvas-mute);
}

.footer-meta-value {
  font-size: 14px;
  line-height: 1.55;
  color: var(--on-canvas);
  word-break: break-word;
}

.footer-note {
  margin-top: 14px;
  font-size: 12px;
  line-height: 1.7;
  color: var(--on-canvas-mute);
}

.footer-base {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px 32px;
  max-width: 1360px;
  margin-inline: auto;
  padding: 18px clamp(16px, 3vw, 40px) 28px;
  border-top: 1px solid var(--edge);
}

.footer-base .footer-note { margin-top: 0; }

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--on-canvas-mute);
}

.footer-legal span + span::before {
  content: "·";
  margin: 0 0.7em;
  color: var(--signal);
}

@media (max-width: 1080px) {
  .footer-frame { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); }
  .footer-brand { grid-column: 1 / -1; }
}

@media (max-width: 720px) {
  .footer-frame { grid-template-columns: minmax(0, 1fr); }
  .footer-nav { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-base { flex-direction: column; align-items: flex-start; }
}

/* ---------- 7. 版式容器与栅格 ---------- */
.container {
  width: 100%;
  max-width: 1240px;
  margin-inline: auto;
  padding-inline: clamp(16px, 3vw, 40px);
}

.section { padding-block: clamp(48px, 7vw, 96px); }

.section--tight { padding-block: clamp(28px, 4vw, 48px); }

.grid {
  display: grid;
  gap: clamp(16px, 2.4vw, 32px);
}

.grid--2 { grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); }

.grid--3 { grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); }

.grid--split {
  grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
}

@media (max-width: 900px) {
  .grid--split { grid-template-columns: minmax(0, 1fr); }
}

/* ---------- 8. 面包屑 ---------- */
.breadcrumbs {
  padding-block: 16px;
  border-bottom: 1px solid var(--edge);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--on-canvas-mute);
}

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

.breadcrumb-list li { display: inline-flex; align-items: center; }

.breadcrumb-list li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--signal);
}

.breadcrumb-link {
  color: var(--on-canvas-mute);
  transition: color 0.2s var(--ease);
}

.breadcrumb-link:hover { color: var(--cyan); }

.breadcrumb-current { color: var(--on-canvas); }

/* ---------- 9. 纸面板与长文 ---------- */
.paper-panel {
  background: var(--surface);
  color: var(--on-surface);
  border: 1px solid rgba(12, 43, 36, 0.14);
  border-radius: var(--radius);
  padding: clamp(20px, 3vw, 36px);
  box-shadow: var(--shadow-paper);
}

.prose {
  max-width: 68ch;
  font-size: 17px;
  line-height: 1.8;
  color: inherit;
}

.prose > * + * { margin-top: 1.05em; }

.prose h2 {
  font-size: clamp(24px, 3vw, 32px);
  margin-top: 1.9em;
}

.prose h3 {
  font-size: clamp(19px, 2.2vw, 24px);
  margin-top: 1.6em;
}

.prose ul { margin-top: 1em; display: grid; gap: 0.5em; }

.prose ul li {
  position: relative;
  padding-left: 1.3em;
}

.prose ul li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.75em;
  width: 10px;
  height: 2px;
  background: var(--signal);
}

.prose blockquote {
  padding: 12px 0 12px 18px;
  border-left: 2px solid var(--signal);
  color: var(--on-surface-mute);
}

.prose hr {
  border: 0;
  border-top: 1px dashed rgba(12, 43, 36, 0.28);
  margin-block: 2em;
}

/* ---------- 10. 标签 ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  background: var(--surface-2);
  color: var(--on-surface);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.16em;
  line-height: 1.5;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 8px), calc(100% - 8px) 100%, 0 100%);
}

.tag--signal { background: var(--signal); color: var(--ink); }

.tag--cyan { background: var(--cyan); color: var(--ink); }

/* ---------- 11. 比分带（全站固定模块） ---------- */
.score-band {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 12px 24px;
  padding: 16px 20px;
  background: var(--canvas-2);
  border: 1px solid var(--edge);
  border-left: 3px solid var(--signal);
  border-radius: var(--radius);
}

.score-row {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 16px;
}

.score-num {
  font-family: var(--font-num);
  font-variant-numeric: tabular-nums;
  font-size: clamp(28px, 4vw, 44px);
  font-weight: 700;
  line-height: 1;
  color: var(--signal);
}

.score-meta {
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--on-canvas-mute);
}

.score-status {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.18em;
  color: var(--cyan);
}

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

/* ---------- 12. 图片容器（页面阶段放置 img / 占位） ---------- */
.media-frame {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  background: var(--canvas-2);
  border: 1px solid var(--edge);
  border-radius: var(--radius);
}

.media-frame img,
.media-frame video {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media-frame::after {
  content: "";
  position: absolute;
  inset: 8px;
  border: 1px solid rgba(251, 250, 246, 0.22);
  pointer-events: none;
  clip-path: polygon(0 0, 22px 0, 22px 1px, 1px 1px, 1px 22px, 0 22px,
    0 calc(100% - 22px), 1px calc(100% - 22px), 1px calc(100% - 1px),
    22px calc(100% - 1px), 22px 100%, 0 100%,
    0 0, 100% 0, 100% 22px, calc(100% - 1px) 22px, calc(100% - 1px) 1px,
    calc(100% - 22px) 1px, calc(100% - 22px) 0,
    100% 0, 100% 100%, 0 100%);
}

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

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

/* ---------- 13. 滚动显现 ---------- */
.reveal {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.4s var(--ease), transform 0.4s var(--ease);
  transition-delay: calc(var(--i, 0) * 60ms);
}

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

/* ---------- 14. 动效降级 ---------- */
@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;
  }

  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .nav-link:hover,
  .nav-link:focus-visible,
  .footer-link:hover,
  .footer-link:focus-visible { transform: none; }
}