/* ==========================================================================
   斗鱼体育 · 全站共享外壳样式  /assets/site.css
   侧边轨道导航 + 深海数据分区 + 暖纸说明牌
   ========================================================================== */

/* ---------- 1. 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;
  padding: 0;
}

ul, ol { list-style: none; }

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

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

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

button { background: none; border: 0; cursor: pointer; }

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

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

/* ---------- 2. 设计变量 ---------- */
:root {
  --ink: #061726;
  --ink-deep: #04121C;
  --deep: #0E2F4A;
  --slate: #14313D;
  --teal-dark: #0B3B3A;
  --cyan: #22E0D6;
  --orange: #FF6A2B;
  --gold: #FFC857;
  --paper: #F2EBDF;
  --mist: #9FC3C8;
  --white: #E8F1F4;

  --line: rgba(159, 195, 200, 0.22);
  --line-strong: rgba(34, 224, 214, 0.5);
  --line-paper: rgba(6, 23, 38, 0.16);

  --rail-w: 248px;
  --rail-h: 62px;
  --shell: 1240px;
  --gutter: clamp(18px, 4vw, 40px);

  --r-s: 4px;
  --r-m: 10px;
  --r-l: 16px;

  --fs-display: clamp(2.35rem, 6vw, 4rem);
  --fs-h2: clamp(1.55rem, 3vw, 2.2rem);
  --fs-h3: clamp(1.1rem, 1.8vw, 1.35rem);

  --font-sans: "Noto Sans SC", "Source Han Sans SC", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  --font-mono: "JetBrains Mono", "IBM Plex Mono", ui-monospace, SFMono-Regular,
    Menlo, Consolas, monospace;

  --ease: cubic-bezier(0.22, 0.68, 0.28, 1);
  --shadow-card: 0 1px 0 rgba(232, 241, 244, 0.04), 0 18px 36px -24px rgba(0, 0, 0, 0.85);
}

/* ---------- 3. 基础排版 ---------- */
body {
  min-height: 100vh;
  font-family: var(--font-sans);
  font-size: 16.5px;
  line-height: 1.75;
  color: var(--mist);
  background-color: var(--ink);
  background-image:
    radial-gradient(1100px 620px at 84% -10%, rgba(34, 224, 214, 0.10), transparent 62%),
    radial-gradient(900px 520px at -8% 4%, rgba(255, 106, 43, 0.08), transparent 60%),
    linear-gradient(180deg, #061726 0%, #061726 58%, #081C2A 100%);
  background-attachment: fixed;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

@media (min-width: 1024px) {
  body { padding-left: var(--rail-w); }
}

@media (max-width: 1023.98px) {
  body { padding-top: var(--rail-h); }
  body.nav-open { overflow: hidden; }
}

h1, h2, h3, h4 {
  font-family: var(--font-sans);
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: -0.01em;
  color: var(--white);
}

h2 { font-size: var(--fs-h2); }
h3 { font-size: var(--fs-h3); letter-spacing: 0; }

p { max-width: 70ch; }

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

.display {
  font-size: var(--fs-display);
  line-height: 1.04;
  letter-spacing: -0.025em;
  font-weight: 900;
  color: var(--white);
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--cyan);
}

.lead {
  font-size: clamp(1rem, 1.6vw, 1.15rem);
  line-height: 1.72;
  color: var(--mist);
}

.muted { color: rgba(159, 195, 200, 0.78); }

.measure { max-width: 68ch; }

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

.num--cyan { color: var(--cyan); }
.num--orange { color: var(--orange); }
.num--gold { color: var(--gold); }

.on-paper { color: var(--deep); }
.on-paper h1,
.on-paper h2,
.on-paper h3,
.on-paper h4,
.on-paper .display { color: var(--ink); }
.on-paper strong { color: var(--ink); }
.on-paper .eyebrow { color: #0B5B62; }
.on-paper .muted { color: rgba(14, 47, 74, 0.72); }
.on-paper .num { color: var(--ink); }

/* ---------- 4. 布局工具 ---------- */
.wrap {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.stack { display: grid; gap: clamp(14px, 2vw, 22px); }

.grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: clamp(16px, 2.4vw, 28px);
}

.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-10 { grid-column: span 10; }
.span-12 { grid-column: span 12; }

.split {
  display: grid;
  grid-template-columns: 5fr 7fr;
  gap: clamp(20px, 3vw, 46px);
  align-items: start;
}

.split[data-bias="right"] { grid-template-columns: 7fr 5fr; }

.section { margin-block: clamp(44px, 7vw, 88px); }

.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 12px 24px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--line);
  margin-bottom: clamp(20px, 3vw, 34px);
}

@media (max-width: 900px) {
  .span-3, .span-4, .span-5, .span-6,
  .span-7, .span-8, .span-9, .span-10 { grid-column: span 12; }
  .split,
  .split[data-bias="right"] { grid-template-columns: 1fr; }
}

/* ---------- 5. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 18px;
  border-radius: 999px;
  border: 1px solid transparent;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.02em;
  line-height: 1.3;
  transition: transform 0.18s var(--ease), background-color 0.18s var(--ease),
    border-color 0.18s var(--ease), color 0.18s var(--ease);
}

.btn-primary {
  background-color: var(--orange);
  color: #22100A;
  box-shadow: 0 12px 26px -16px rgba(255, 106, 43, 0.95);
}

.btn-primary:hover { background-color: #FF7F49; transform: translateY(-2px); }

.btn-ghost {
  border-color: var(--line);
  background-color: rgba(14, 47, 74, 0.45);
  color: var(--white);
}

.btn-ghost:hover {
  border-color: var(--line-strong);
  color: var(--cyan);
  transform: translateY(-2px);
}

/* ---------- 6. 侧边轨道：头部 ---------- */
.skip-link {
  position: fixed;
  left: 14px;
  top: -80px;
  z-index: 200;
  padding: 10px 18px;
  border-radius: 0 0 var(--r-m) var(--r-m);
  background-color: var(--cyan);
  color: #042028;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.04em;
  transition: top 0.18s var(--ease);
}

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

.site-rail {
  position: fixed;
  z-index: 60;
  color: var(--white);
  background-color: var(--ink-deep);
  background-image: linear-gradient(180deg, #04121E 0%, #061726 46%, #082130 100%);
  border-right: 1px solid var(--line);
}

.rail-progress {
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 2px;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background-image: linear-gradient(90deg, var(--cyan), var(--orange));
  box-shadow: 0 0 12px rgba(34, 224, 214, 0.55);
  pointer-events: none;
}

.rail-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 11px;
  min-width: 0;
}

.brand-mark {
  position: relative;
  flex: none;
  width: 30px;
  height: 30px;
  border-radius: 8px;
  background-image: linear-gradient(140deg, var(--cyan), #0B7F8C 72%);
  box-shadow: 0 0 0 1px rgba(34, 224, 214, 0.35), 0 10px 20px -12px rgba(34, 224, 214, 0.95);
}

.brand-mark::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 8px;
  width: 3px;
  height: 14px;
  border-radius: 2px;
  background-color: var(--ink);
  transform: skewX(-14deg);
}

.brand-mark::after {
  content: "";
  position: absolute;
  left: 14px;
  top: 8px;
  width: 9px;
  height: 14px;
  border-radius: 2px;
  background-color: var(--ink);
  clip-path: polygon(0 0, 100% 50%, 0 100%);
}

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

.brand-name {
  font-size: 19px;
  font-weight: 900;
  letter-spacing: 0.06em;
  line-height: 1.15;
  color: var(--white);
}

.brand-line {
  margin-top: 3px;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--mist);
  white-space: nowrap;
}

.rail-toggle {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 8px 13px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--white);
  background-color: rgba(14, 47, 74, 0.4);
  transition: border-color 0.18s var(--ease), color 0.18s var(--ease);
}

.rail-toggle:hover { border-color: var(--line-strong); color: var(--cyan); }

.rail-toggle-bars {
  display: grid;
  gap: 4px;
  width: 18px;
}

.rail-toggle-bars i {
  display: block;
  height: 2px;
  border-radius: 2px;
  background-color: var(--cyan);
  transition: transform 0.2s var(--ease), opacity 0.2s var(--ease);
}

.rail-toggle-label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.site-rail[data-open="true"] .rail-toggle-bars i:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.site-rail[data-open="true"] .rail-toggle-bars i:nth-child(2) { opacity: 0; }
.site-rail[data-open="true"] .rail-toggle-bars i:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

.rail-drawer { min-width: 0; }

.rail-nav { min-width: 0; }

.rail-list {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.rail-link {
  position: relative;
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: center;
  gap: 12px;
  padding: 10px 10px 10px 14px;
  border: 1px solid transparent;
  border-radius: var(--r-m);
  color: var(--mist);
  font-size: 15px;
  transition: background-color 0.18s var(--ease), border-color 0.18s var(--ease),
    color 0.18s var(--ease);
}

.rail-link:hover {
  color: var(--white);
  border-color: var(--line);
  background-color: rgba(14, 47, 74, 0.62);
}

.rail-link[aria-current="page"],
.rail-link[data-active="true"] {
  color: var(--white);
  border-color: rgba(34, 224, 214, 0.34);
  background-image: linear-gradient(90deg, rgba(34, 224, 214, 0.16), rgba(34, 224, 214, 0));
  background-color: rgba(14, 47, 74, 0.5);
}

.rail-link[aria-current="page"]::before,
.rail-link[data-active="true"]::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  bottom: 9px;
  width: 3px;
  border-radius: 2px;
  background-color: var(--orange);
  box-shadow: 0 0 10px rgba(255, 106, 43, 0.7);
}

.rail-idx {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--cyan);
  opacity: 0.75;
}

.rail-link[aria-current="page"] .rail-idx,
.rail-link[data-active="true"] .rail-idx { opacity: 1; }

.rail-label {
  font-weight: 600;
  letter-spacing: 0.02em;
}

.rail-actions {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.rail-scrim { display: none; }

/* 桌面端轨道形态 */
@media (min-width: 1024px) {
  .site-rail {
    top: 0;
    left: 0;
    bottom: 0;
    width: var(--rail-w);
    display: flex;
    flex-direction: column;
    gap: 22px;
    padding: 26px 18px 22px;
  }

  .rail-bar { justify-content: flex-start; }

  .brand-name { font-size: 23px; }

  .rail-toggle { display: none; }

  .rail-drawer {
    flex: 1;
    min-height: 0;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    gap: 20px;
  }

  .rail-nav {
    flex: 1;
    min-height: 0;
    overflow-y: auto;
    overscroll-behavior: contain;
    padding-right: 2px;
  }

  .rail-actions {
    padding-top: 16px;
    border-top: 1px solid var(--line);
  }

  .rail-actions .btn { width: 100%; }
}

/* 移动端轨道形态 */
@media (max-width: 1023.98px) {
  .site-rail {
    top: 0;
    left: 0;
    right: 0;
    display: flex;
    flex-direction: column;
    border-right: 0;
    border-bottom: 1px solid var(--line);
    background-image: linear-gradient(180deg, #04121E 0%, #06202F 100%);
  }

  .rail-bar {
    min-height: var(--rail-h);
    padding: 10px 16px;
    position: relative;
    z-index: 3;
  }

  .rail-drawer {
    position: fixed;
    left: 0;
    right: 0;
    top: var(--rail-h);
    z-index: 2;
    max-height: calc(100vh - var(--rail-h));
    overflow-y: auto;
    overscroll-behavior: contain;
    padding: 10px 16px 22px;
    background-image: linear-gradient(180deg, #041320 0%, #061726 100%);
    border-bottom: 1px solid var(--line);
    box-shadow: 0 26px 40px -28px rgba(0, 0, 0, 0.95);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transform: translateY(-10px);
    transition: opacity 0.22s var(--ease), transform 0.22s var(--ease),
      visibility 0.22s var(--ease);
  }

  .site-rail[data-open="true"] .rail-drawer {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transform: none;
  }

  .rail-list { margin-bottom: 16px; }

  .rail-link { padding: 12px 12px 12px 16px; font-size: 15.5px; }

  .rail-actions { padding-top: 16px; border-top: 1px solid var(--line); }

  .rail-scrim {
    display: block;
    position: fixed;
    inset: 0;
    z-index: 1;
    border: 0;
    border-radius: 0;
    background-color: rgba(3, 10, 17, 0.66);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity 0.22s var(--ease), visibility 0.22s var(--ease);
  }

  .site-rail[data-open="true"] .rail-scrim {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
  }
}

/* ---------- 7. 页脚 ---------- */
.site-foot {
  margin-top: clamp(52px, 8vw, 104px);
  border-top: 1px solid var(--line);
  background-color: #04121C;
  background-image:
    linear-gradient(180deg, rgba(11, 59, 58, 0.4), rgba(4, 18, 28, 0) 58%),
    radial-gradient(760px 320px at 88% 0%, rgba(34, 224, 214, 0.08), transparent 70%);
  color: var(--mist);
}

.foot-inner {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding: clamp(38px, 5vw, 66px) var(--gutter) 30px;
  display: grid;
  grid-template-columns: 1.3fr 1fr 1fr 1fr;
  gap: clamp(26px, 3.4vw, 46px);
}

.foot-logo {
  display: inline-block;
  font-size: 22px;
  font-weight: 900;
  letter-spacing: 0.08em;
  color: var(--white);
}

.foot-line {
  margin-top: 10px;
  font-size: 14.5px;
  letter-spacing: 0.06em;
  color: var(--cyan);
  max-width: 30ch;
}

.foot-meta {
  display: grid;
  gap: 8px;
  margin-top: 18px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.02em;
  color: rgba(159, 195, 200, 0.86);
}

.foot-meta li { display: flex; flex-wrap: wrap; gap: 8px; }

.foot-meta-key {
  flex: none;
  color: rgba(159, 195, 200, 0.6);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  font-size: 11px;
  padding-top: 1px;
}

.foot-col-title {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--cyan);
  margin-bottom: 14px;
}

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

.foot-list a {
  display: inline-block;
  font-size: 14.5px;
  color: var(--mist);
  border-bottom: 1px solid transparent;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
}

.foot-list a:hover { color: var(--white); border-bottom-color: var(--line-strong); }

.foot-base { border-top: 1px solid var(--line); }

.foot-base-inner {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding: 16px var(--gutter) 26px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px 22px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: rgba(159, 195, 200, 0.78);
}

.foot-legal,
.foot-copy { max-width: none; }

.to-top {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.14em;
  color: var(--white);
  transition: border-color 0.18s var(--ease), color 0.18s var(--ease),
    transform 0.18s var(--ease);
}

.to-top::before {
  content: "";
  width: 7px;
  height: 7px;
  border-left: 1.5px solid currentColor;
  border-top: 1.5px solid currentColor;
  transform: rotate(45deg);
  transition: transform 0.18s var(--ease);
}

.to-top:hover {
  border-color: var(--line-strong);
  color: var(--cyan);
  transform: translateY(-2px);
}

@media (max-width: 1000px) {
  .foot-inner { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 620px) {
  .foot-inner { grid-template-columns: 1fr; }
  .foot-base-inner { justify-content: flex-start; }
}

/* ---------- 8. 面包屑 ---------- */
.crumbs {
  margin-bottom: 20px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.crumbs-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 22px;
}

.crumbs-item {
  position: relative;
  color: rgba(159, 195, 200, 0.75);
}

.crumbs-item + .crumbs-item::before {
  content: "/";
  position: absolute;
  left: -14px;
  color: rgba(159, 195, 200, 0.42);
}

.crumbs-item a { color: var(--mist); }
.crumbs-item a:hover { color: var(--cyan); }
.crumbs-item[aria-current="page"] { color: var(--cyan); }

/* ---------- 9. 内容组件 ---------- */
.card {
  position: relative;
  padding: clamp(18px, 2.2vw, 26px);
  border: 1px solid var(--line);
  border-radius: var(--r-l);
  background-image: linear-gradient(160deg, rgba(14, 47, 74, 0.78), rgba(6, 23, 38, 0.92));
  box-shadow: var(--shadow-card);
  transition: transform 0.2s var(--ease), border-color 0.2s var(--ease);
}

.card:hover {
  transform: translateY(-2px);
  border-color: var(--line-strong);
}

.card--paper {
  border-color: var(--line-paper);
  background-color: var(--paper);
  background-image: linear-gradient(165deg, #F7F1E6 0%, #E9E0CF 100%);
  color: var(--deep);
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.5), 0 20px 38px -26px rgba(0, 0, 0, 0.8);
}

.card--paper:hover { border-color: rgba(255, 106, 43, 0.5); }

.card--paper a { color: #0B5B62; border-bottom: 1px solid rgba(11, 91, 98, 0.35); }
.card--paper a:hover { color: var(--orange); border-bottom-color: var(--orange); }

.panel {
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-radius: var(--r-m);
  background-color: rgba(20, 49, 61, 0.55);
}

.plaque {
  padding: 12px 18px 12px 16px;
  border-left: 3px solid var(--orange);
  background-image: linear-gradient(90deg, rgba(255, 106, 43, 0.14), rgba(255, 106, 43, 0));
}

.plaque-title {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--orange);
}

.plaque-body {
  margin-top: 6px;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--mist);
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 11px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background-color: rgba(34, 224, 214, 0.08);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--cyan);
}

.tag--orange {
  border-color: rgba(255, 106, 43, 0.42);
  background-color: rgba(255, 106, 43, 0.12);
  color: var(--orange);
}

.tag--gold {
  border-color: rgba(255, 200, 87, 0.42);
  background-color: rgba(255, 200, 87, 0.12);
  color: var(--gold);
}

.stat { display: grid; gap: 6px; }

.stat-value {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(1.55rem, 3vw, 2.15rem);
  font-weight: 700;
  line-height: 1.1;
  color: var(--white);
}

.stat-label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--mist);
}

.data-bar {
  position: relative;
  height: 8px;
  border-radius: 999px;
  background-color: rgba(159, 195, 200, 0.16);
  overflow: hidden;
}

.data-bar > span {
  display: block;
  height: 100%;
  width: calc(var(--v, 0) * 1%);
  transform-origin: 0 50%;
  border-radius: inherit;
  background-image: linear-gradient(90deg, var(--cyan), #0B7F8C);
}

.data-bar[data-tone="orange"] > span {
  background-image: linear-gradient(90deg, var(--orange), #C7440F);
}

.data-bar[data-tone="gold"] > span {
  background-image: linear-gradient(90deg, var(--gold), #C98F14);
}

.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.filter-btn {
  padding: 8px 15px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background-color: rgba(14, 47, 74, 0.42);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--mist);
  transition: background-color 0.18s var(--ease), border-color 0.18s var(--ease),
    color 0.18s var(--ease), transform 0.18s var(--ease);
}

.filter-btn:hover {
  color: var(--white);
  border-color: var(--line-strong);
}

.filter-btn[aria-pressed="true"] {
  background-color: var(--orange);
  border-color: var(--orange);
  color: #22100A;
  box-shadow: 0 10px 22px -14px rgba(255, 106, 43, 0.95);
}

[data-hidden="true"] { display: none !important; }

/* ---------- 10. 图片容器基础规则 ---------- */
.media-frame {
  position: relative;
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  min-height: 180px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--r-l);
  background-color: var(--deep);
  background-image:
    linear-gradient(140deg, rgba(14, 47, 74, 0.92), rgba(6, 23, 38, 0.96)),
    repeating-linear-gradient(115deg, rgba(34, 224, 214, 0.08) 0 2px, transparent 2px 15px);
}

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

.media-frame[data-ratio="4/3"] { aspect-ratio: 4 / 3; }
.media-frame[data-ratio="1/1"] { aspect-ratio: 1 / 1; }
.media-frame[data-ratio="21/9"] { aspect-ratio: 21 / 9; }

.media-cap {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 26px 16px 12px;
  background-image: linear-gradient(0deg, rgba(3, 10, 17, 0.88), rgba(3, 10, 17, 0));
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--white);
}

/* ---------- 11. 入场显现 ---------- */
.reveal[data-revealed="true"] {
  animation: reveal-in 0.5s var(--ease) both;
}

@keyframes reveal-in {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: none; }
}

@media (prefers-reduced-motion: no-preference) {
  .reveal[data-revealed="true"] .data-bar > span {
    animation: bar-grow 0.42s var(--ease) both;
  }

  @keyframes bar-grow {
    from { transform: scaleX(0); }
    to { transform: scaleX(1); }
  }
}

@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;
    scroll-behavior: auto !important;
  }

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