/* =========================================================
   天天娱乐汇 · 共享样式 /assets/site.css
   结构：1 reset 2 变量 3 中文排版 4 通用容器与网格
   5 基础组件 6 图片容器 7 头部 8 页脚 9 响应式 10 动效
   ========================================================= */

/* ---------- 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, figure, blockquote, dl, dd {
  margin: 0;
}

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

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

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

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

::selection {
  background: rgba(123, 44, 255, .55);
  color: #FFFFFF;
}

/* ---------- 2. 变量 ---------- */
:root {
  --c-purple: #7B2CFF;
  --c-purple-soft: #B15CFF;
  --c-orange: #FF6B1A;
  --c-amber: #FFB23E;
  --c-space: #0B1026;
  --c-midnight: #141B3D;
  --c-mint: #5FF2C2;
  --c-mist: #8B90A8;
  --c-ice: #F4F1FF;
  --c-carbon: #05060D;

  --text: var(--c-ice);
  --text-soft: #C9C6E0;
  --text-mute: var(--c-mist);

  --line: rgba(139, 144, 168, .20);
  --line-strong: rgba(177, 92, 255, .40);
  --glass-edge: rgba(244, 241, 255, .14);

  --radius-sm: 8px;
  --radius: 14px;
  --radius-lg: 22px;
  --radius-pill: 999px;

  --shell: 1200px;
  --gutter: 24px;

  --shadow-sm: 0 12px 26px -20px rgba(5, 6, 13, .95);
  --shadow: 0 28px 62px -34px rgba(5, 6, 13, .96);

  --ease: cubic-bezier(.22, .61, .36, 1);

  --font-sans: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-head: var(--font-sans);
}

/* ---------- 3. 中文排版 ---------- */
body {
  min-height: 100vh;
  font-family: var(--font-sans);
  font-size: 16px;
  font-weight: 500;
  line-height: 1.85;
  color: var(--text);
  background-color: var(--c-space);
  background-image:
    radial-gradient(1100px 620px at 84% -8%, rgba(123, 44, 255, .30), transparent 60%),
    radial-gradient(880px 520px at 2% 14%, rgba(255, 107, 26, .14), transparent 62%),
    radial-gradient(820px 560px at 60% 106%, rgba(95, 242, 194, .10), transparent 66%);
  background-repeat: no-repeat;
  background-attachment: fixed;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-head);
  font-weight: 900;
  line-height: 1.18;
  letter-spacing: -.01em;
  color: var(--c-ice);
}

h1 { font-size: clamp(34px, 6vw, 72px); }
h2 { font-size: clamp(26px, 4vw, 44px); }
h3 { font-size: clamp(20px, 2.6vw, 28px); }
h4 { font-size: clamp(17px, 2vw, 20px); }

p {
  max-width: 46em;
  line-height: 1.88;
}

strong { font-weight: 800; color: var(--c-ice); }

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

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

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

.section--flush {
  padding-block: 0;
}

.grid {
  display: grid;
  gap: clamp(18px, 2.6vw, 32px);
}

.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }

.grid--stagger {
  display: grid;
  gap: clamp(18px, 2.6vw, 32px);
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

@media (min-width: 960px) {
  .grid--stagger > *:nth-child(even) {
    transform: translateY(34px);
  }
}

/* ---------- 5. 基础组件 ---------- */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 12px;
  font-weight: 800;
  letter-spacing: .24em;
  color: var(--c-mint);
  text-transform: uppercase;
}

.eyebrow::before {
  content: "";
  width: 22px;
  height: 2px;
  background: linear-gradient(90deg, var(--c-purple-soft), var(--c-orange));
}

.annotation {
  font-size: 11.5px;
  font-weight: 700;
  letter-spacing: .26em;
  color: rgba(139, 144, 168, .92);
  text-transform: uppercase;
}

.annotation--vertical {
  writing-mode: vertical-rl;
  text-orientation: mixed;
  letter-spacing: .34em;
}

.lead {
  font-size: clamp(16px, 1.8vw, 19px);
  line-height: 1.85;
  color: var(--text-soft);
  max-width: 44em;
}

.prose {
  color: var(--text-soft);
}

.prose p + p { margin-top: 1.1em; }
.prose p { max-width: 44em; }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 20px;
  border: 1px solid transparent;
  border-radius: 10px;
  font-family: var(--font-head);
  font-size: 14.5px;
  font-weight: 800;
  letter-spacing: .03em;
  line-height: 1.2;
  cursor: pointer;
  transition: transform .18s var(--ease), box-shadow .18s var(--ease),
              background-color .18s var(--ease), color .18s var(--ease),
              border-color .18s var(--ease);
}

.btn-primary {
  background: linear-gradient(100deg, var(--c-orange), var(--c-amber));
  color: var(--c-carbon);
  box-shadow: 0 12px 26px -14px rgba(255, 107, 26, .95);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 18px 32px -16px rgba(255, 107, 26, 1);
}

.btn-ghost {
  background: rgba(123, 44, 255, .16);
  color: var(--c-ice);
  border-color: rgba(177, 92, 255, .46);
}

.btn-ghost:hover {
  background: rgba(123, 44, 255, .28);
  border-color: var(--c-purple-soft);
  transform: translateY(-2px);
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 12px;
  border: 1px solid rgba(177, 92, 255, .42);
  border-radius: var(--radius-pill);
  background: rgba(123, 44, 255, .18);
  color: var(--c-ice);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: .06em;
}

.tag--mint {
  background: rgba(95, 242, 194, .14);
  border-color: rgba(95, 242, 194, .42);
  color: var(--c-mint);
}

.tag--orange {
  background: rgba(255, 107, 26, .16);
  border-color: rgba(255, 178, 62, .44);
  color: var(--c-amber);
}

.card {
  position: relative;
  padding: clamp(20px, 2.6vw, 30px);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--c-midnight);
  box-shadow: var(--shadow-sm);
  transition: transform .2s var(--ease), border-color .2s var(--ease), box-shadow .2s var(--ease);
}

.card--glass {
  background: linear-gradient(160deg, rgba(244, 241, 255, .10), rgba(20, 27, 61, .62));
  border-color: var(--glass-edge);
  -webkit-backdrop-filter: blur(12px) saturate(130%);
  backdrop-filter: blur(12px) saturate(130%);
}

.card--light {
  background: var(--c-ice);
  border-color: rgba(20, 27, 61, .12);
  color: #211A3D;
}

.card--light h2,
.card--light h3,
.card--light h4 { color: #14102E; }
.card--light p { color: #3A3358; }

a.card:hover,
.card--hover:hover {
  transform: translateY(-3px);
  border-color: var(--line-strong);
  box-shadow: var(--shadow);
}

.crumbs {
  padding-block: 14px;
  font-size: 12.5px;
  letter-spacing: .06em;
  color: var(--c-mist);
}

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

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

.crumbs-item + .crumbs-item::before {
  content: "/";
  color: rgba(139, 144, 168, .5);
}

.crumbs-link {
  color: var(--c-mist);
  border-bottom: 1px solid transparent;
  transition: color .18s var(--ease), border-color .18s var(--ease);
}

.crumbs-link:hover {
  color: var(--c-ice);
  border-bottom-color: var(--c-orange);
}

.crumbs-item[aria-current="page"] {
  color: var(--c-ice);
  font-weight: 700;
}

/* ---------- 6. 可复用图片容器 ---------- */
.media {
  position: relative;
  display: block;
  overflow: hidden;
  isolation: isolate;
  border: 1px solid var(--glass-edge);
  border-radius: var(--radius);
  background-image: linear-gradient(140deg, rgba(123, 44, 255, .34), rgba(255, 107, 26, .22) 58%, rgba(95, 242, 194, .18));
}

.media::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  opacity: .45;
  background-image:
    linear-gradient(rgba(244, 241, 255, .10) 1px, transparent 1px),
    linear-gradient(90deg, rgba(244, 241, 255, .10) 1px, transparent 1px);
  background-size: 44px 44px;
}

.media img,
.media svg,
.media video {
  position: relative;
  z-index: 1;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media--16x9 { aspect-ratio: 16 / 9; }
.media--4x3  { aspect-ratio: 4 / 3; }
.media--1x1  { aspect-ratio: 1 / 1; }
.media--wide { aspect-ratio: 21 / 9; }

.media--glass {
  background-image: linear-gradient(160deg, rgba(244, 241, 255, .12), rgba(20, 27, 61, .55));
  border-color: rgba(244, 241, 255, .20);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
}

.media-label {
  position: absolute;
  z-index: 2;
  left: 14px;
  bottom: 14px;
  padding: 6px 13px;
  border: 1px solid rgba(95, 242, 194, .45);
  border-radius: var(--radius-pill);
  background: rgba(5, 6, 13, .74);
  color: var(--c-mint);
  font-size: 11.5px;
  font-weight: 800;
  letter-spacing: .10em;
  -webkit-backdrop-filter: blur(6px);
  backdrop-filter: blur(6px);
}

/* ---------- 7. 头部命令栏 ---------- */
.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 200;
  transform: translateY(-180%);
  padding: 12px 20px;
  border-radius: 10px;
  background: var(--c-mint);
  color: var(--c-carbon);
  font-family: var(--font-head);
  font-size: 14px;
  font-weight: 800;
  letter-spacing: .04em;
  transition: transform .2s var(--ease);
}

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

.site-header {
  position: -webkit-sticky;
  position: sticky;
  top: 0;
  z-index: 60;
  background: linear-gradient(180deg, rgba(20, 27, 61, .97), rgba(11, 16, 38, .90));
  border-bottom: 1px solid rgba(177, 92, 255, .26);
  box-shadow: 0 1px 0 rgba(95, 242, 194, .07), 0 22px 46px -34px rgba(5, 6, 13, .95);
  -webkit-backdrop-filter: blur(14px) saturate(140%);
  backdrop-filter: blur(14px) saturate(140%);
}

.site-header::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--c-purple), var(--c-orange) 48%, var(--c-mint));
  opacity: .92;
}

.header-inner {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding: 16px var(--gutter) 0;
}

.header-top {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding-bottom: 12px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
  color: var(--c-ice);
}

.brand-mark {
  flex: 0 0 auto;
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--c-purple-soft), var(--c-orange));
  color: var(--c-carbon);
  font-family: var(--font-head);
  font-size: 17px;
  font-weight: 900;
  letter-spacing: .02em;
  box-shadow: 0 10px 22px -12px rgba(123, 44, 255, .95), inset 0 0 0 1px rgba(244, 241, 255, .35);
}

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

.brand-name {
  display: block;
  font-family: var(--font-head);
  font-size: 20px;
  font-weight: 900;
  line-height: 1.2;
  letter-spacing: .02em;
  color: var(--c-ice);
}

.brand-tagline {
  display: block;
  font-size: 11.5px;
  font-weight: 700;
  line-height: 1.5;
  letter-spacing: .09em;
  color: var(--c-mist);
  white-space: nowrap;
}

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

.status-chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 14px;
  border: 1px solid rgba(95, 242, 194, .35);
  border-radius: var(--radius-pill);
  background: rgba(95, 242, 194, .08);
  color: var(--c-mint);
  font-size: 12.5px;
  font-weight: 800;
  letter-spacing: .04em;
  white-space: nowrap;
}

.status-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--c-mint);
  box-shadow: 0 0 0 4px rgba(95, 242, 194, .18);
}

.header-cta {
  white-space: nowrap;
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  padding: 10px 14px;
  border: 1px solid rgba(177, 92, 255, .44);
  border-radius: 10px;
  background: rgba(123, 44, 255, .18);
  color: var(--c-ice);
  font-family: var(--font-head);
  font-size: 12.5px;
  font-weight: 800;
  letter-spacing: .12em;
  cursor: pointer;
  transition: background-color .18s var(--ease), border-color .18s var(--ease);
}

.nav-toggle:hover {
  background: rgba(123, 44, 255, .32);
  border-color: var(--c-purple-soft);
}

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

.nav-toggle-bars::before,
.nav-toggle-bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 16px;
  height: 2px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--c-purple-soft), var(--c-orange));
  transition: transform .22s var(--ease), top .22s var(--ease);
}

.nav-toggle-bars::before { top: 0; }
.nav-toggle-bars::after  { top: 8px; }

.site-header[data-open] .nav-toggle-bars::before {
  top: 4px;
  transform: rotate(45deg);
}

.site-header[data-open] .nav-toggle-bars::after {
  top: 4px;
  transform: rotate(-45deg);
}

.nav-toggle-label {
  display: inline-block;
  line-height: 1;
}

.nav-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  border-top: 1px solid rgba(139, 144, 168, .16);
}

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

.nav-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 4px;
}

.nav-link {
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  padding: 13px 12px;
  border-bottom: 2px solid transparent;
  color: var(--c-mist);
  font-size: 14.5px;
  font-weight: 700;
  letter-spacing: .02em;
  transition: color .18s var(--ease), background-color .18s var(--ease), border-color .18s var(--ease);
}

.nav-index {
  font-size: 11px;
  font-weight: 800;
  letter-spacing: .08em;
  color: rgba(177, 92, 255, .85);
  font-variant-numeric: tabular-nums;
}

.nav-label {
  white-space: nowrap;
}

.nav-link:hover {
  color: var(--c-ice);
  background: rgba(123, 44, 255, .14);
  border-bottom-color: rgba(255, 107, 26, .55);
}

.nav-link:hover .nav-index {
  color: var(--c-purple-soft);
}

.nav-link[aria-current="page"] {
  color: var(--c-ice);
  border-bottom-color: var(--c-orange);
  background: rgba(255, 107, 26, .08);
}

.nav-link[aria-current="page"] .nav-index {
  color: var(--c-amber);
}

.nav-footnote {
  max-width: none;
  padding-bottom: 2px;
  color: rgba(139, 144, 168, .88);
  font-size: 11.5px;
  font-weight: 700;
  letter-spacing: .14em;
  white-space: nowrap;
}

.scroll-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  overflow: hidden;
  background: rgba(139, 144, 168, .16);
  pointer-events: none;
}

.scroll-progress-bar {
  display: block;
  width: 100%;
  height: 100%;
  transform: scaleX(0);
  transform-origin: left center;
  background: linear-gradient(90deg, var(--c-purple), var(--c-orange) 55%, var(--c-mint));
}

/* ---------- 8. 页脚拼贴层 ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(48px, 8vw, 96px);
  border-top: 1px solid rgba(177, 92, 255, .22);
  background-color: #080B1B;
  background-image: linear-gradient(180deg, rgba(20, 27, 61, .92) 0%, rgba(11, 16, 38, .96) 40%, #06070F 100%);
  color: var(--c-ice);
}

.site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--c-purple), var(--c-orange) 48%, var(--c-mint));
}

.footer-inner {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding: clamp(36px, 5vw, 64px) var(--gutter) 28px;
}

.footer-top {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1.2fr;
  gap: clamp(24px, 4vw, 56px);
  align-items: start;
}

.footer-brand {
  min-width: 0;
}

.footer-brand-line {
  max-width: 18em;
  color: var(--c-ice);
  font-family: var(--font-head);
  font-size: clamp(18px, 2.4vw, 24px);
  font-weight: 900;
  line-height: 1.5;
  letter-spacing: .01em;
}

@supports ((background-clip: text) or (-webkit-background-clip: text)) {
  .footer-brand-line {
    background-image: linear-gradient(100deg, var(--c-ice) 34%, var(--c-purple-soft) 88%);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
  }
}

.footer-coords {
  max-width: none;
  margin-top: 14px;
  color: rgba(139, 144, 168, .82);
  font-size: 11.5px;
  font-weight: 700;
  letter-spacing: .22em;
}

.footer-col {
  min-width: 0;
}

.footer-col-title {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 14px;
  color: var(--c-mint);
  font-family: var(--font-head);
  font-size: 12.5px;
  font-weight: 800;
  letter-spacing: .22em;
  line-height: 1.4;
}

.footer-col-title::before {
  content: "";
  width: 6px;
  height: 6px;
  background: linear-gradient(135deg, var(--c-purple-soft), var(--c-orange));
  transform: rotate(45deg);
}

.footer-list {
  display: grid;
  gap: 10px;
}

.footer-list-item {
  min-width: 0;
}

.footer-link {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 2px 0;
  border-bottom: 1px solid transparent;
  color: var(--text-soft);
  font-size: 15px;
  font-weight: 600;
  transition: color .18s var(--ease), border-color .18s var(--ease);
}

.footer-link::before {
  content: "";
  width: 6px;
  height: 6px;
  flex: 0 0 auto;
  background: var(--c-purple-soft);
  transform: rotate(45deg);
  opacity: .75;
  transition: background-color .18s var(--ease);
}

.footer-link:hover {
  color: var(--c-ice);
  border-bottom-color: var(--c-orange);
}

.footer-link:hover::before {
  background: var(--c-orange);
}

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

.footer-contact-item {
  display: grid;
  gap: 2px;
  min-width: 0;
}

.footer-contact-key {
  color: var(--c-mist);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: .16em;
}

.footer-contact-value {
  color: var(--text-soft);
  font-size: 14.5px;
  font-weight: 600;
  line-height: 1.7;
  word-break: break-word;
  font-variant-numeric: tabular-nums;
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px 24px;
  margin-top: clamp(28px, 4vw, 44px);
  padding-top: 20px;
  border-top: 1px dashed rgba(139, 144, 168, .24);
  color: var(--c-mist);
  font-size: 12.5px;
  letter-spacing: .05em;
}

.footer-copy,
.footer-icp {
  max-width: none;
  color: var(--c-mist);
  font-size: 12.5px;
}

.footer-icp {
  font-variant-numeric: tabular-nums;
  letter-spacing: .08em;
}

/* ---------- 9. 响应式 ---------- */
@media (max-width: 1024px) {
  .nav-footnote { display: none; }
  .nav-bar { justify-content: flex-start; }
}

@media (max-width: 900px) {
  .header-inner { padding: 12px var(--gutter) 0; }
  .header-top { padding-bottom: 10px; gap: 10px; }
  .status-chip { display: none; }
  .brand-tagline { font-size: 10.5px; letter-spacing: .04em; }
  .nav-toggle { display: inline-flex; }

  .nav-bar {
    display: none;
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    gap: 8px;
    margin-top: 2px;
    padding: 6px 0 14px;
    border-top: 1px solid rgba(139, 144, 168, .18);
  }

  .site-header[data-open] .nav-bar { display: flex; }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
  }

  .nav-link {
    width: 100%;
    justify-content: flex-start;
    padding: 14px 12px;
    border-bottom: 1px solid rgba(139, 144, 168, .14);
    border-left: 3px solid transparent;
    font-size: 15px;
  }

  .nav-link:hover { background: rgba(123, 44, 255, .12); }

  .nav-link[aria-current="page"] {
    background: rgba(255, 107, 26, .10);
    border-left-color: var(--c-orange);
    border-bottom-color: rgba(139, 144, 168, .14);
  }

  .nav-footnote {
    display: block;
    padding: 8px 12px 0;
    white-space: normal;
    letter-spacing: .12em;
    line-height: 1.7;
  }

  .grid--2,
  .grid--3 { grid-template-columns: 1fr; }

  .grid--stagger > *:nth-child(even) { transform: none; }

  .footer-top { grid-template-columns: 1fr 1fr; }
  .footer-brand { grid-column: 1 / -1; }
  .footer-brand-line { max-width: none; }
}

@media (max-width: 600px) {
  :root { --gutter: 16px; }

  .brand-mark { width: 38px; height: 38px; border-radius: 10px; font-size: 15px; }
  .brand-name { font-size: 17px; }
  .brand-tagline { display: none; }

  .header-cta { padding: 9px 13px; font-size: 12.5px; }
  .nav-toggle { padding: 9px 11px; }

  .nav-toggle-label {
    position: absolute;
    width: 1px;
    height: 1px;
    overflow: hidden;
    clip-path: inset(50%);
    white-space: nowrap;
  }

  .footer-top { grid-template-columns: 1fr; gap: 28px; }
  .footer-bottom { flex-direction: column; align-items: flex-start; }
  .annotation--vertical { writing-mode: horizontal-tb; letter-spacing: .2em; }
}

/* ---------- 10. 动效与无障碍 ---------- */
@keyframes revealIn {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: none; }
}

html.js [data-reveal].is-visible {
  animation: revealIn .62s var(--ease) both;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
    scroll-behavior: auto !important;
  }

  html.js [data-reveal].is-visible { animation: none; }
  .btn-primary:hover,
  .btn-ghost:hover,
  a.card:hover,
  .card--hover:hover { transform: none; }
}