/* ==========================================================================
   爱游戏官方版 · 共享站点样式 /assets/site.css
   夜间球场指挥台 + 档案资料系统
   ========================================================================== */

/* ---------- 01. 设计变量 ---------- */
:root {
  --ink-900: #0A1713;
  --ink-800: #111A17;
  --ink-700: #16241D;
  --moss: #243A2E;
  --rock: #C9D1C9;
  --chalk: #F2EFE3;
  --lime: #C6FF4A;
  --signal: #FF7A3D;
  --data: #76E6D3;
  --clay: #B87355;
  --mist: #6E7F73;

  --line: rgba(201, 209, 201, 0.14);
  --line-soft: rgba(201, 209, 201, 0.08);
  --line-lime: rgba(198, 255, 74, 0.36);

  --rail-w: 264px;
  --bar-h: 64px;
  --pad: clamp(16px, 3.2vw, 40px);
  --maxw: 1120px;

  --r-sm: 8px;
  --r-md: 14px;
  --r-lg: 24px;

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

  --font-display: "Barlow Condensed", "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  --font-body: "Noto Sans SC", system-ui, -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

/* ---------- 02. Reset ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

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

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

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

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

a { color: inherit; }

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

:where(a, button, [tabindex]):focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: 3px;
  border-radius: 6px;
}

::selection {
  background: var(--lime);
  color: var(--ink-900);
}

/* ---------- 03. 基础排版 ---------- */
body {
  min-height: 100vh;
  background: var(--ink-900);
  color: var(--rock);
  font-family: var(--font-body);
  font-size: clamp(15px, 0.45vw + 13.8px, 17px);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(201, 209, 201, 0.022) 1px, transparent 1px),
    linear-gradient(90deg, rgba(201, 209, 201, 0.022) 1px, transparent 1px);
  background-size: 64px 64px;
  -webkit-mask-image: radial-gradient(130% 80% at 72% 0%, #000 26%, transparent 76%);
  mask-image: radial-gradient(130% 80% at 72% 0%, #000 26%, transparent 76%);
}

main { display: block; }

#main-content { scroll-margin-top: calc(var(--bar-h) + 16px); }

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 800;
  line-height: 1.18;
  letter-spacing: -0.02em;
  color: var(--chalk);
}

a { text-decoration-thickness: 1px; text-underline-offset: 3px; }

/* ---------- 04. 布局工具 ---------- */
.container {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: var(--pad);
}

.section {
  position: relative;
  padding-block: clamp(40px, 6vw, 88px);
}

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

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

.stack > * + * { margin-top: var(--stack-gap, 16px); }

.cluster {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
}

/* ---------- 05. 文字组件 ---------- */
.display {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(30px, 5.4vw, 60px);
  line-height: 1.06;
  letter-spacing: -0.02em;
  color: var(--chalk);
}

.lede {
  max-width: 62ch;
  font-size: clamp(15px, 1.2vw + 12px, 17.5px);
  line-height: 1.8;
  color: var(--rock);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--lime);
}

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

.section-num {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--signal);
}

.mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.02em;
}

.note {
  font-size: 12.5px;
  line-height: 1.7;
  letter-spacing: 0.02em;
  color: var(--mist);
}

.prose {
  max-width: 68ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--rock);
}

.prose > * + * { margin-top: 1em; }

.prose h2 {
  margin-top: 1.9em;
  font-size: clamp(22px, 2.4vw, 30px);
}

.prose h3 {
  margin-top: 1.6em;
  font-size: clamp(18px, 1.8vw, 22px);
  color: var(--chalk);
}

.prose ul,
.prose ol {
  list-style: disc;
  padding-left: 1.3em;
}

.prose ol { list-style: decimal; }

.prose li + li { margin-top: 0.4em; }

.prose strong { color: var(--chalk); }

.prose a {
  color: var(--data);
  text-decoration: underline;
  text-decoration-color: rgba(118, 230, 211, 0.5);
}

.prose a:hover { text-decoration-color: var(--data); }

/* ---------- 06. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 44px;
  padding: 11px 20px;
  border: 1px solid transparent;
  border-radius: 999px;
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-align: center;
  text-decoration: none;
  cursor: pointer;
  transition: transform 0.25s var(--ease), background 0.25s var(--ease),
              color 0.25s var(--ease), border-color 0.25s var(--ease),
              box-shadow 0.25s var(--ease);
}

.btn--lime {
  background: var(--lime);
  color: var(--ink-900);
  box-shadow: 0 10px 26px -16px rgba(198, 255, 74, 0.9);
}

.btn--lime:hover {
  background: #D7FF79;
  transform: translateY(-2px);
}

.btn--lime:active { transform: translateY(0); }

.btn--ghost {
  background: transparent;
  color: var(--chalk);
  border-color: rgba(201, 209, 201, 0.32);
}

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

.btn--block {
  width: 100%;
  display: flex;
}

/* ---------- 07. 卡片 / 标签 / 分隔 ---------- */
.card {
  position: relative;
  padding: clamp(16px, 2.2vw, 24px);
  background: var(--ink-800);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  overflow: hidden;
  transition: border-color 0.28s var(--ease), transform 0.28s var(--ease);
}

.card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 46px;
  height: 2px;
  background: var(--lime);
  opacity: 0.85;
}

.card:hover { border-color: rgba(198, 255, 74, 0.32); }

.card--archive {
  background: linear-gradient(158deg, rgba(36, 58, 46, 0.92), rgba(17, 26, 23, 0.96));
  border-color: rgba(198, 255, 74, 0.22);
}

.card--archive::before { background: var(--clay); width: 64px; height: 3px; }

.card__title {
  font-family: var(--font-display);
  font-size: clamp(19px, 1.6vw, 23px);
  font-weight: 800;
  line-height: 1.3;
  letter-spacing: -0.01em;
  color: var(--chalk);
}

.card__meta {
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--mist);
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 10px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(201, 209, 201, 0.06);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.12em;
  line-height: 1.7;
  color: var(--rock);
}

.tag--lime {
  background: rgba(198, 255, 74, 0.12);
  border-color: rgba(198, 255, 74, 0.4);
  color: var(--lime);
}

.tag--clay {
  background: rgba(184, 115, 85, 0.18);
  border-color: rgba(184, 115, 85, 0.5);
  color: #EFC4AE;
}

.tag--data {
  background: rgba(118, 230, 211, 0.12);
  border-color: rgba(118, 230, 211, 0.42);
  color: var(--data);
}

.rule {
  height: 0;
  border: 0;
  border-top: 1px solid var(--line);
  margin-block: clamp(20px, 3vw, 36px);
}

/* ---------- 08. 图片容器基座 ---------- */
.media {
  position: relative;
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background-color: var(--ink-800);
  background-image:
    linear-gradient(rgba(198, 255, 74, 0.07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(198, 255, 74, 0.07) 1px, transparent 1px),
    radial-gradient(120% 92% at 18% 0%, rgba(36, 58, 46, 0.95), rgba(10, 23, 19, 0.96) 72%);
  background-size: 28px 28px, 28px 28px, auto;
}

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

.media--wide { aspect-ratio: 21 / 9; }
.media--square { aspect-ratio: 1 / 1; }
.media--portrait { aspect-ratio: 4 / 5; }

.media--scrim::after {
  content: "";
  position: absolute;
  inset: auto 0 0 0;
  height: 42%;
  pointer-events: none;
  background: linear-gradient(180deg, transparent, rgba(10, 23, 19, 0.66));
}

.media__caption {
  margin-top: 8px;
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--mist);
}

/* ---------- 09. 面包屑 ---------- */
.breadcrumb { padding-top: 18px; }

.breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--mist);
}

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

.breadcrumb__list li + li::before {
  content: "/";
  color: rgba(201, 209, 201, 0.3);
}

.breadcrumb__link {
  color: var(--rock);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.22s var(--ease), border-color 0.22s var(--ease);
}

.breadcrumb__link:hover {
  color: var(--lime);
  border-color: var(--line-lime);
}

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

/* ---------- 10. 跳转链接 ---------- */
.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 120;
  padding: 10px 18px;
  border-radius: 999px;
  background: var(--lime);
  color: var(--ink-900);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-decoration: none;
  transform: translateY(-180%);
  transition: transform 0.28s var(--ease);
}

.skip-link:focus,
.skip-link:focus-visible {
  transform: translateY(0);
  outline-offset: 2px;
}

/* ---------- 11. 头部：左侧轨道 ---------- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  z-index: 80;
  display: flex;
  flex-direction: column;
  gap: 22px;
  width: var(--rail-w);
  padding: 26px 20px 22px;
  background: linear-gradient(180deg, #0B1A15 0%, #0A1713 46%, #0C1B16 100%);
  border-right: 1px solid var(--line);
  overflow-y: auto;
  overscroll-behavior: contain;
  scrollbar-width: thin;
}

.site-header::before {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: 2px;
  pointer-events: none;
  background: linear-gradient(180deg, var(--lime) 0%, rgba(198, 255, 74, 0) 42%, rgba(255, 122, 61, 0.55) 100%);
}

.rail__top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex: none;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
  text-decoration: none;
}

.brand__mark {
  position: relative;
  flex: none;
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border: 1px solid rgba(198, 255, 74, 0.45);
  border-radius: 12px;
  background: var(--moss);
  overflow: hidden;
}

.brand__mark::before {
  content: "";
  position: absolute;
  right: -6px;
  bottom: -8px;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: rgba(255, 122, 61, 0.26);
}

.brand__mark-core {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--lime);
  box-shadow: 0 0 0 4px rgba(198, 255, 74, 0.14);
}

.brand__text {
  display: flex;
  flex-direction: column;
  gap: 3px;
  min-width: 0;
}

.brand__name {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--chalk);
}

.brand__line {
  font-size: 10.5px;
  line-height: 1.3;
  letter-spacing: 0.14em;
  color: var(--mist);
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  min-height: 40px;
  padding: 8px 14px;
  border: 1px solid rgba(198, 255, 74, 0.4);
  border-radius: 999px;
  background: rgba(198, 255, 74, 0.08);
  color: var(--chalk);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  cursor: pointer;
  transition: background 0.25s var(--ease), border-color 0.25s var(--ease);
}

.nav-toggle:hover { background: rgba(198, 255, 74, 0.16); }

.nav-toggle__bars {
  position: relative;
  display: block;
  width: 16px;
  height: 10px;
}

.nav-toggle__bars i {
  position: absolute;
  left: 0;
  right: 0;
  height: 2px;
  border-radius: 2px;
  background: var(--lime);
  transition: transform 0.3s var(--ease), opacity 0.3s var(--ease);
}

.nav-toggle__bars i:first-child { top: 0; }
.nav-toggle__bars i:last-child { bottom: 0; }

.site-header[data-open] .nav-toggle__bars i:first-child {
  transform: translateY(4px) rotate(45deg);
}

.site-header[data-open] .nav-toggle__bars i:last-child {
  transform: translateY(-4px) rotate(-45deg);
}

.site-nav {
  display: flex;
  flex-direction: column;
  gap: 18px;
  flex: 1;
  min-height: 0;
}

.site-nav__kicker {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 10.5px;
  font-weight: 700;
  letter-spacing: 0.22em;
  color: var(--mist);
}

.site-nav__kicker::before {
  content: "";
  width: 14px;
  height: 1px;
  background: var(--lime);
}

.site-nav__list {
  display: grid;
  gap: 2px;
}

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

.site-nav__link {
  position: relative;
  display: grid;
  grid-template-columns: 26px minmax(0, 1fr);
  align-items: center;
  gap: 10px;
  padding: 10px 8px 10px 14px;
  border-radius: 10px;
  font-size: 14.5px;
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--rock);
  text-decoration: none;
  transition: color 0.25s var(--ease), background 0.25s var(--ease);
}

.site-nav__link::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 3px;
  height: 0;
  border-radius: 3px;
  background: var(--lime);
  transform: translateY(-50%);
  transition: height 0.28s var(--ease);
}

.site-nav__link:hover {
  color: var(--chalk);
  background: rgba(198, 255, 74, 0.07);
}

.site-nav__link:hover::before { height: 12px; }

.site-nav__link[aria-current="page"] {
  color: var(--lime);
  background: rgba(198, 255, 74, 0.1);
}

.site-nav__link[aria-current="page"]::before { height: 22px; }

.site-nav__idx {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--mist);
  transition: color 0.25s var(--ease);
}

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

.site-nav__label { overflow-wrap: anywhere; }

.rail__foot {
  display: grid;
  gap: 12px;
  margin-top: auto;
  padding-top: 16px;
  border-top: 1px solid var(--line-soft);
}

.rail__foot .btn {
  padding: 10px 14px;
  font-size: 13.5px;
  letter-spacing: 0.06em;
}

.rail__note {
  font-size: 11.5px;
  line-height: 1.65;
  letter-spacing: 0.04em;
  color: var(--mist);
}

.nav-scrim { display: none; }

/* 桌面端为主内容让出轨道宽度 */
@media (min-width: 1024px) {
  body { padding-left: var(--rail-w); }
}

/* ---------- 12. 头部：移动端顶栏 + 抽屉 ---------- */
@media (max-width: 1023.98px) {
  .site-header {
    inset: 0 0 auto 0;
    width: auto;
    height: var(--bar-h);
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding: 0 16px;
    border-right: 0;
    border-bottom: 1px solid var(--line);
    background: rgba(10, 23, 19, 0.95);
    -webkit-backdrop-filter: blur(12px);
    backdrop-filter: blur(12px);
    overflow: visible;
  }

  .site-header::before { display: none; }

  .rail__top {
    flex: 1;
    width: 100%;
    justify-content: space-between;
  }

  .brand__name { font-size: 16px; }
  .brand__line { display: none; }

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

  .site-nav {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    z-index: 2;
    width: min(84vw, 320px);
    height: 100%;
    padding: calc(var(--bar-h) + 18px) 20px 24px;
    background: linear-gradient(180deg, #0C1B16 0%, #0A1713 100%);
    border-right: 1px solid rgba(198, 255, 74, 0.24);
    box-shadow: 24px 0 60px -30px rgba(0, 0, 0, 0.92);
    overflow-y: auto;
    transform: translateX(-104%);
    visibility: hidden;
    transition: transform 0.4s var(--ease), visibility 0.4s var(--ease);
  }

  .site-header[data-open] .site-nav,
  .site-nav[data-open] {
    transform: translateX(0);
    visibility: visible;
  }

  .site-nav__list { gap: 4px; }

  .site-nav__link {
    padding-block: 12px;
    font-size: 15.5px;
  }

  body.is-nav-open { overflow: hidden; }

  .nav-scrim {
    display: block;
    position: fixed;
    inset: 0;
    z-index: 70;
    background: rgba(4, 10, 8, 0.68);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.32s var(--ease);
  }

  .site-header[data-open] + .nav-scrim {
    opacity: 1;
    pointer-events: auto;
  }
}

/* ---------- 13. 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(48px, 7vw, 96px);
  padding-top: clamp(32px, 4.6vw, 60px);
  background: linear-gradient(180deg, #0A1713 0%, #08120F 72%);
  border-top: 1px solid var(--line);
  color: var(--rock);
}

.site-footer::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: min(240px, 42%);
  height: 2px;
  background: linear-gradient(90deg, var(--lime), rgba(198, 255, 74, 0));
}

.footer__inner {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
  padding-bottom: clamp(28px, 4vw, 48px);
}

.footer__lead {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 14px;
}

.footer__mark {
  font-family: var(--font-display);
  font-size: clamp(22px, 2.6vw, 28px);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.01em;
  color: var(--chalk);
}

.footer__summary {
  max-width: 34ch;
  font-size: 14px;
  line-height: 1.8;
  color: var(--rock);
}

.footer__cols {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.footer__col { min-width: 0; }

.footer__heading {
  margin-bottom: 12px;
  font-family: var(--font-body);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.2em;
  color: var(--mist);
}

.footer__list { display: grid; gap: 8px; }

.footer__link {
  display: inline-block;
  padding-bottom: 2px;
  font-size: 14px;
  color: var(--rock);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.22s var(--ease), border-color 0.22s var(--ease);
}

.footer__link:hover {
  color: var(--lime);
  border-color: rgba(198, 255, 74, 0.6);
}

.footer__contact { min-width: 0; }

.footer__meta { display: grid; gap: 10px; }

.footer__meta-row {
  display: grid;
  grid-template-columns: 74px minmax(0, 1fr);
  gap: 10px;
  padding-bottom: 8px;
  border-bottom: 1px dashed rgba(201, 209, 201, 0.12);
  font-size: 13px;
}

.footer__meta-row dt {
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--mist);
  line-height: 1.9;
}

.footer__meta-row dd {
  min-width: 0;
  line-height: 1.65;
  color: var(--chalk);
  overflow-wrap: anywhere;
}

.footer__meta-value {
  font-family: var(--font-mono);
  letter-spacing: 0.04em;
}

.footer__legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 20px;
  padding-block: 18px 22px;
  border-top: 1px solid var(--line);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--mist);
}

.footer__legal-item { min-width: 0; }

.footer__legal-note {
  margin-left: auto;
  color: rgba(110, 127, 115, 0.9);
}

@media (min-width: 720px) {
  .footer__inner {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    align-items: start;
  }

  .footer__lead,
  .footer__contact { grid-column: 1 / -1; }

  .footer__contact { max-width: 520px; }
}

@media (min-width: 1024px) {
  .footer__inner {
    grid-template-columns: minmax(220px, 0.95fr) minmax(0, 1.5fr) minmax(240px, 1fr);
    align-items: start;
  }

  .footer__lead,
  .footer__contact { grid-column: auto; }

  .footer__contact {
    padding-left: clamp(0px, 2vw, 26px);
    border-left: 1px solid var(--line-soft);
  }
}

/* ---------- 14. 滚动进度与回顶 ---------- */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 90;
  height: 2px;
  pointer-events: none;
}

.scroll-progress__bar {
  width: 100%;
  height: 100%;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--lime), var(--data) 55%, var(--signal));
  transition: transform 0.12s linear;
}

@media (min-width: 1024px) {
  .scroll-progress { left: var(--rail-w); }
}

.to-top {
  position: fixed;
  right: clamp(14px, 3vw, 28px);
  bottom: clamp(14px, 3vw, 28px);
  z-index: 75;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 46px;
  height: 46px;
  border: 1px solid rgba(198, 255, 74, 0.45);
  border-radius: 50%;
  background: rgba(10, 23, 19, 0.88);
  color: var(--lime);
  font-size: 18px;
  line-height: 1;
  cursor: pointer;
  opacity: 0;
  transform: translateY(10px);
  pointer-events: none;
  -webkit-backdrop-filter: blur(6px);
  backdrop-filter: blur(6px);
  transition: opacity 0.3s var(--ease), transform 0.3s var(--ease), background 0.25s var(--ease);
}

.to-top[data-visible] {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

.to-top:hover { background: rgba(198, 255, 74, 0.16); }

/* ---------- 15. 滚动显现 ---------- */
.js .reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.55s var(--ease), transform 0.55s var(--ease);
  transition-delay: var(--stagger, 0ms);
}

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

/* ---------- 16. 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;
    scroll-behavior: auto !important;
  }

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

  .scroll-progress__bar { transition: none; }

  .site-nav,
  .nav-scrim,
  .to-top { transition: none; }
}

/* ---------- 17. 小屏微调 ---------- */
@media (max-width: 479.98px) {
  .footer__cols { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer__meta-row { grid-template-columns: 66px minmax(0, 1fr); }
  .footer__legal-note { margin-left: 0; }
  .btn { padding: 10px 16px; font-size: 13.5px; }
}