/* ==========================================================================
   多宝体育看台 · /assets/site.css
   共享外壳：夜间看台 × 数据指挥台
   ========================================================================== */

/* ---------- 1. Reset ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

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

body { margin: 0; }

h1, h2, h3, h4, h5, p, figure, blockquote, ul, ol, dl, dd { margin: 0; }

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

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

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

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

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

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

::selection {
  background: var(--lime);
  color: #06170F;
}

/* ---------- 2. 变量 ---------- */
:root {
  --ink: #071C16;
  --ink-2: #0E2A22;
  --turf: #1F5C4A;
  --lime: #C7FF3D;
  --amber: #FFB347;
  --amber-deep: #8A4B12;
  --paper: #F4F1E8;
  --fog: #8FA79D;
  --line: #23443A;
  --line-soft: rgba(35, 68, 58, 0.6);

  --font-display: "Helvetica Neue", "Arial Narrow", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-body: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", system-ui, sans-serif;
  --font-num: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;

  --container: 1240px;
  --gutter: clamp(16px, 4vw, 44px);
  --radius: 2px;
  --dur: 0.2s;
  --ease: cubic-bezier(0.2, 0.7, 0.2, 1);
}

/* ---------- 3. 基础排版 ---------- */
body {
  font-family: var(--font-body);
  font-size: clamp(15px, 0.4vw + 13px, 17px);
  line-height: 1.78;
  letter-spacing: 0.01em;
  color: var(--paper);
  background-color: var(--ink);
  background-image:
    radial-gradient(1100px 520px at 82% -12%, rgba(199, 255, 61, 0.07), transparent 68%),
    radial-gradient(900px 460px at 0% 6%, rgba(255, 179, 71, 0.05), transparent 70%),
    repeating-linear-gradient(90deg, var(--line-soft) 0 1px, transparent 1px 120px);
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 800;
  line-height: 1.08;
  letter-spacing: -0.015em;
  color: var(--paper);
}

h1 { font-size: clamp(2.2rem, 6vw, 4.4rem); }
h2 { font-size: clamp(1.55rem, 3.4vw, 2.5rem); }
h3 { font-size: clamp(1.1rem, 1.8vw, 1.45rem); line-height: 1.28; }

p { max-width: 68ch; }

strong { font-weight: 700; }

.t-display {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2.4rem, 7vw, 5.2rem);
  line-height: 0.96;
  letter-spacing: -0.03em;
  color: var(--paper);
}

.t-title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.4rem, 2.6vw, 2rem);
  line-height: 1.1;
}

.t-label {
  font-size: 0.7rem;
  letter-spacing: 0.26em;
  text-transform: uppercase;
  color: var(--fog);
}

.lead {
  font-size: clamp(1rem, 1.3vw, 1.15rem);
  line-height: 1.8;
  color: rgba(244, 241, 232, 0.82);
}

.num {
  font-family: var(--font-num);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.06em;
}

/* ---------- 4. 容器 / 区块 / 网格 ---------- */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section { padding-block: clamp(44px, 6vw, 88px); }
.section--tight { padding-block: clamp(26px, 4vw, 50px); }
.section--turf {
  background: linear-gradient(180deg, rgba(31, 92, 74, 0.34), rgba(14, 42, 34, 0.9));
  border-block: 1px solid var(--line);
}

.grid { display: grid; gap: clamp(16px, 2.4vw, 28px); }
.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: 1fr; }

@media (min-width: 880px) {
  .grid--split { grid-template-columns: minmax(170px, 0.7fr) minmax(0, 2fr); }
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 0.7rem;
  letter-spacing: 0.26em;
  text-transform: uppercase;
  color: var(--lime);
}

.eyebrow::before {
  content: "";
  width: 26px;
  height: 1px;
  background: currentColor;
}

.rule {
  height: 1px;
  border: 0;
  margin: 0;
  background: var(--line);
}

/* ---------- 5. 按钮与链接 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 13px 22px;
  border: 1px solid var(--line);
  background: var(--ink-2);
  color: var(--paper);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease),
    border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.btn:hover {
  border-color: var(--lime);
  color: var(--lime);
  transform: translateY(-2px);
}

.btn--lime {
  background: var(--lime);
  border-color: var(--lime);
  color: #06170F;
}

.btn--lime:hover {
  background: transparent;
  color: var(--lime);
}

.btn--ghost { background: transparent; }

.btn--amber {
  border-color: rgba(255, 179, 71, 0.7);
  color: var(--amber);
  background: transparent;
}

.btn--amber:hover {
  background: var(--amber);
  border-color: var(--amber);
  color: #2A1400;
}

.link-underline {
  position: relative;
  display: inline-block;
  padding-bottom: 2px;
  color: var(--paper);
  transition: color var(--dur) var(--ease);
}

.link-underline::after {
  content: "";
  position: absolute;
  left: 0;
  right: 100%;
  bottom: 0;
  height: 1px;
  background: var(--lime);
  transition: right var(--dur) var(--ease);
}

.link-underline:hover { color: var(--lime); }
.link-underline:hover::after { right: 0; }

/* ---------- 6. 面包屑 ---------- */
.breadcrumb {
  margin-bottom: clamp(20px, 3vw, 36px);
  padding-block: 13px;
  border-bottom: 1px solid var(--line-soft);
}

.breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--fog);
}

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

.breadcrumb__item:not(:last-child)::after {
  content: "/";
  font-family: var(--font-num);
  color: var(--line);
}

.breadcrumb__link {
  color: var(--fog);
  transition: color var(--dur) var(--ease);
}

.breadcrumb__link:hover { color: var(--lime); }
.breadcrumb__current { color: var(--paper); }

/* ---------- 7. 展签面板 / 标签 ---------- */
.panel {
  position: relative;
  padding: clamp(18px, 2.4vw, 30px);
  border: 1px solid var(--line);
  background: linear-gradient(160deg, rgba(14, 42, 34, 0.92), rgba(7, 28, 22, 0.94));
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.panel:hover {
  border-color: var(--lime);
  transform: translateY(-2px);
}

.panel--turf {
  border-color: var(--line);
  background: linear-gradient(160deg, rgba(31, 92, 74, 0.55), rgba(14, 42, 34, 0.95));
}

.panel__label {
  display: block;
  margin-bottom: 10px;
  font-size: 0.66rem;
  letter-spacing: 0.26em;
  text-transform: uppercase;
  color: var(--fog);
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 9px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(7, 28, 22, 0.6);
  font-size: 0.64rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--fog);
}

.tag--lime {
  border-color: rgba(199, 255, 61, 0.55);
  background: rgba(199, 255, 61, 0.08);
  color: var(--lime);
}

.tag--amber {
  border-color: rgba(255, 179, 71, 0.55);
  background: rgba(255, 179, 71, 0.08);
  color: var(--amber);
}

/* ---------- 8. 图片容器基础规则 ---------- */
.media {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  border: 1px solid var(--line);
  background: linear-gradient(150deg, var(--turf), #0B241D);
}

.media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.72) contrast(1.06) brightness(0.92) hue-rotate(-6deg);
  transition: transform 0.6s var(--ease), filter 0.6s var(--ease);
}

.media:hover img {
  transform: scale(1.03);
  filter: saturate(0.92) contrast(1.1) brightness(1);
}

.media::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  opacity: 0.7;
  mix-blend-mode: screen;
  background-image:
    repeating-linear-gradient(0deg, rgba(199, 255, 61, 0.06) 0 1px, transparent 1px 44px),
    repeating-linear-gradient(90deg, rgba(199, 255, 61, 0.06) 0 1px, transparent 1px 44px);
}

.media--wide { aspect-ratio: 21 / 9; }
.media--tall { aspect-ratio: 3 / 4; }
.media--square { aspect-ratio: 1 / 1; }

.media__tag {
  position: absolute;
  top: 0;
  left: 0;
  z-index: 2;
  padding: 6px 10px;
  background: var(--lime);
  color: #06170F;
  font-family: var(--font-num);
  font-size: 0.64rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.media__caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 2;
  padding: 14px 16px;
  font-size: 0.76rem;
  letter-spacing: 0.04em;
  color: rgba(244, 241, 232, 0.84);
  background: linear-gradient(0deg, rgba(4, 18, 14, 0.94), rgba(4, 18, 14, 0));
}

/* ---------- 9. 数据表 ---------- */
.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--line);
  background: rgba(7, 28, 22, 0.62);
}

.data-table {
  min-width: 520px;
  font-size: 0.86rem;
}

.data-table caption {
  padding: 12px 14px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  font-size: 0.66rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--fog);
}

.data-table th,
.data-table td {
  padding: 11px 14px;
  border-bottom: 1px solid var(--line-soft);
  text-align: left;
}

.data-table thead th {
  background: rgba(31, 92, 74, 0.3);
  font-size: 0.64rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--fog);
}

.data-table tbody tr { transition: background var(--dur) var(--ease); }
.data-table tbody tr:hover { background: rgba(199, 255, 61, 0.07); }

/* ---------- 10. 浅底正文卡（法律/声明页） ---------- */
.sheet {
  padding: clamp(24px, 4vw, 56px);
  border: 1px solid var(--line);
  background: var(--paper);
  color: rgba(7, 28, 22, 0.86);
}

.sheet h2,
.sheet h3 { color: var(--ink); }

.sheet a {
  color: var(--amber-deep);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.sheet .t-label { color: var(--amber-deep); }

/* ---------- 11. 跳过链接 ---------- */
.skip-link {
  position: absolute;
  top: 8px;
  left: var(--gutter);
  z-index: 200;
  padding: 10px 16px;
  background: var(--lime);
  color: #04140F;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  transform: translateY(-200%);
  transition: transform var(--dur) var(--ease);
}

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

/* ---------- 12. 头部 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 80;
  border-bottom: 1px solid var(--line);
  background: linear-gradient(180deg, #08201A 0%, #071C16 100%);
  box-shadow: 0 1px 0 rgba(199, 255, 61, 0.07);
}

.progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  z-index: 2;
  height: 2px;
  overflow: hidden;
  pointer-events: none;
}

.progress__bar {
  display: block;
  width: 100%;
  height: 100%;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--lime), var(--amber));
  transition: transform 0.12s linear;
}

.header__rail {
  border-bottom: 1px solid var(--line-soft);
  background: var(--ink-2);
}

.rail__inner {
  display: flex;
  align-items: center;
  gap: 16px;
  min-height: 36px;
  font-size: 0.66rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--fog);
}

.rail__tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--paper);
  white-space: nowrap;
}

.rail__dot {
  width: 6px;
  height: 6px;
  background: var(--lime);
  box-shadow: 0 0 0 3px rgba(199, 255, 61, 0.16);
}

.rail__meta {
  display: none;
  white-space: nowrap;
}

.rail__meta--amber { color: var(--amber); }
.rail__spacer { flex: 1 1 auto; }

@media (min-width: 600px) {
  .rail__meta { display: inline; }
}

.header__bar { position: relative; }

.header__inner {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  column-gap: 14px;
  padding-block: 10px;
}

/* 品牌 */
.brand {
  display: inline-flex;
  flex-direction: column;
  gap: 3px;
  justify-self: start;
  padding-block: 4px;
}

.brand__mark {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.12rem, 2.4vw, 1.45rem);
  line-height: 1;
  letter-spacing: 0.01em;
  color: var(--paper);
  transition: color var(--dur) var(--ease);
}

.brand__line {
  font-family: var(--font-num);
  font-size: 0.58rem;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--fog);
  transition: color var(--dur) var(--ease);
}

.brand:hover .brand__mark { color: var(--lime); }
.brand:hover .brand__line { color: var(--amber); }

/* 移动按钮 */
.nav-toggle {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  border: 1px solid var(--line);
  color: var(--paper);
  font-size: 0.68rem;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

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

.nav-toggle__bars {
  display: inline-flex;
  flex-direction: column;
  gap: 4px;
  width: 16px;
}

.nav-toggle__bars span {
  display: block;
  height: 1.5px;
  background: currentColor;
  transition: transform var(--dur) var(--ease), opacity var(--dur) var(--ease);
}

.nav-toggle[aria-expanded="true"] {
  border-color: var(--lime);
  color: var(--lime);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(1) { transform: translateY(5.5px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(3) { transform: translateY(-5.5px) rotate(-45deg); }

/* 导航：移动优先 */
.nav {
  display: none;
  grid-column: 1 / -1;
  margin-top: 10px;
  padding-block: 6px 16px;
  border-top: 1px solid var(--line-soft);
}

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

.nav__list {
  display: flex;
  flex-direction: column;
  counter-reset: nav;
}

.nav__item {
  counter-increment: nav;
  border-bottom: 1px solid var(--line-soft);
}

.nav__link {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 13px 2px;
  font-size: 0.95rem;
  letter-spacing: 0.02em;
  color: var(--paper);
  transition: color var(--dur) var(--ease), padding-left var(--dur) var(--ease);
}

.nav__link::before {
  content: counter(nav, decimal-leading-zero);
  display: inline-block;
  width: 1.8em;
  font-family: var(--font-num);
  font-size: 0.64rem;
  letter-spacing: 0.1em;
  color: var(--fog);
  transition: color var(--dur) var(--ease);
}

.nav__link:hover,
.nav__link[aria-current="page"] { color: var(--lime); }

.nav__link:hover { padding-left: 8px; }

.nav__link:hover::before,
.nav__link[aria-current="page"]::before { color: var(--amber); }

.nav__cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  width: 100%;
  margin-top: 14px;
  padding: 13px 18px;
  border: 1px solid var(--lime);
  background: var(--lime);
  color: #06170F;
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease);
}

.nav__cta::after {
  content: "→";
  font-family: var(--font-num);
}

.nav__cta:hover {
  background: transparent;
  color: var(--lime);
}

/* 导航：桌面 */
@media (min-width: 960px) {
  .header__inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: clamp(20px, 3vw, 44px);
    min-height: 78px;
    padding-block: 0;
  }

  .nav-toggle { display: none; }

  .nav {
    display: flex;
    align-items: center;
    gap: clamp(16px, 2.4vw, 34px);
    grid-column: auto;
    margin-top: 0;
    padding-block: 0;
    border-top: 0;
  }

  .nav__list {
    flex-direction: row;
    gap: clamp(10px, 1.4vw, 22px);
  }

  .nav__item { border-bottom: 0; }

  .nav__link {
    display: inline-flex;
    gap: 7px;
    padding: 6px 0;
    border-bottom: 1px solid transparent;
    font-size: 0.84rem;
    letter-spacing: 0.06em;
    transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
  }

  .nav__link:hover { padding-left: 0; border-bottom-color: var(--lime); }

  .nav__link[aria-current="page"] { border-bottom-color: var(--lime); }

  .nav__link::before {
    width: auto;
    font-size: 0.58rem;
    transform: translateY(-0.45em);
  }

  .nav__cta {
    width: auto;
    margin-top: 0;
    padding: 11px 18px;
    font-size: 0.7rem;
  }
}

/* ---------- 13. 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(48px, 7vw, 110px);
  border-top: 1px solid var(--line);
  background: linear-gradient(180deg, #061A14 0%, #040F0C 72%);
}

.site-footer::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: min(260px, 42vw);
  height: 2px;
  background: linear-gradient(90deg, var(--lime), rgba(199, 255, 61, 0));
}

.footer__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(22px, 3.2vw, 40px);
  padding-block: clamp(34px, 5vw, 64px);
}

@media (min-width: 720px) {
  .footer__grid { grid-template-columns: 1fr 1fr; }
}

@media (min-width: 1040px) {
  .footer__grid {
    grid-template-columns: 1.5fr 0.8fr 0.8fr 1.1fr;
    gap: clamp(24px, 3vw, 48px);
  }
}

.footer__brand {
  display: flex;
  flex-direction: column;
  gap: 10px;
  max-width: 36ch;
}

.footer__mark {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.5rem, 3vw, 2.2rem);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.footer__line {
  font-family: var(--font-num);
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  color: var(--lime);
}

.footer__note {
  font-size: 0.82rem;
  line-height: 1.7;
  color: var(--fog);
}

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

@media (min-width: 1040px) {
  .footer__col {
    padding-top: 0;
    padding-left: clamp(16px, 2vw, 28px);
    border-top: 0;
    border-left: 1px solid var(--line-soft);
  }
}

.footer__title {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 14px;
  font-family: var(--font-body);
  font-size: 0.66rem;
  font-weight: 600;
  letter-spacing: 0.26em;
  text-transform: uppercase;
  color: var(--fog);
}

.footer__title::before {
  content: "";
  width: 14px;
  height: 1px;
  background: var(--amber);
}

.footer__list {
  display: flex;
  flex-direction: column;
  gap: 9px;
}

.footer__item {
  font-size: 0.86rem;
  color: var(--fog);
}

.footer__link {
  position: relative;
  display: inline-block;
  color: rgba(244, 241, 232, 0.86);
  transition: color var(--dur) var(--ease);
}

.footer__link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 100%;
  bottom: -2px;
  height: 1px;
  background: var(--lime);
  transition: right var(--dur) var(--ease);
}

.footer__link:hover { color: var(--lime); }
.footer__link:hover::after { right: 0; }

.footer__item--contact {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.footer__label {
  font-size: 0.6rem;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--fog);
}

.footer__value {
  font-family: var(--font-num);
  font-size: 0.8rem;
  line-height: 1.55;
  letter-spacing: 0.02em;
  color: rgba(244, 241, 232, 0.9);
  word-break: break-word;
}

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

.footer__meta-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 22px;
  padding-block: 16px;
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  color: var(--fog);
}

.footer__copy {
  margin: 0;
  color: rgba(244, 241, 232, 0.72);
}

.footer__year {
  font-family: var(--font-num);
  color: var(--lime);
}

.footer__icp {
  margin: 0;
  font-family: var(--font-num);
  color: var(--fog);
}

.footer__hours {
  margin: 0 0 0 auto;
  color: rgba(143, 167, 157, 0.92);
}

@media (max-width: 640px) {
  .footer__hours { margin-left: 0; }
}

/* ---------- 14. 入场显现 / 回到顶部 ---------- */
html.js [data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.5s var(--ease), transform 0.5s var(--ease);
}

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

.to-top {
  position: fixed;
  right: clamp(14px, 3vw, 32px);
  bottom: clamp(14px, 3vw, 28px);
  z-index: 90;
  display: grid;
  place-items: center;
  width: 46px;
  height: 46px;
  border: 1px solid var(--line);
  background: rgba(7, 28, 22, 0.92);
  color: var(--lime);
  font-family: var(--font-num);
  font-size: 1rem;
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: opacity var(--dur) var(--ease), transform var(--dur) var(--ease),
    visibility var(--dur) var(--ease), border-color var(--dur) var(--ease),
    background var(--dur) var(--ease), color var(--dur) var(--ease);
}

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

.to-top:hover {
  border-color: var(--lime);
  background: var(--lime);
  color: #06170F;
}

/* ---------- 15. 减少动效 ---------- */
@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;
    transform: none;
  }

  .to-top { transform: none; }
  .to-top.is-visible { transform: none; }
  .media img { transition: none; }
}