/* ========================================================
   site.css — 天天娱乐 全站共享外壳
   色彩：午夜蓝底 / 霓虹青主强调 / 电光紫装饰 / 暖橙行动
   ======================================================== */

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

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

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

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

/* ---------- 1. Tokens ---------- */
:root {
  --c-midnight: #0A1026;
  --c-ink: #05070F;
  --c-steel: #1B2A4A;
  --c-border: #25345A;
  --c-cyan: #2EF2D0;
  --c-violet: #8B5CF6;
  --c-orange: #FF8A3D;
  --c-white: #F4F7FF;
  --c-grey: #A7B0C8;
  --c-green: #48E08A;

  --shell: 1240px;
  --gutter: clamp(16px, 4vw, 48px);
  --radius-lg: 22px;
  --radius-md: 14px;
  --radius-pill: 999px;

  --font-display: "Archivo Black", "Oswald", "PingFang SC", "Noto Sans SC", "Microsoft YaHei", sans-serif;
  --font-body: "Noto 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(.2, .7, .3, 1);
}

/* ---------- 2. Base ---------- */
body {
  min-height: 100vh;
  overflow-x: clip;
  font-family: var(--font-body);
  font-size: 16px;
  font-weight: 400;
  line-height: 1.75;
  color: var(--c-white);
  background-color: var(--c-midnight);
  background-image:
    radial-gradient(900px 480px at 6% -10%, rgba(139, 92, 246, .20), transparent 70%),
    radial-gradient(820px 420px at 96% 2%, rgba(46, 242, 208, .12), transparent 68%);
  background-repeat: no-repeat;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 900;
  line-height: 1.04;
  letter-spacing: .01em;
  color: var(--c-white);
}
h1 { font-size: clamp(34px, 5.6vw, 72px); }
h2 { font-size: clamp(26px, 3.4vw, 44px); }
h3 { font-size: clamp(18px, 2vw, 26px); line-height: 1.28; }

p { color: var(--c-grey); }

a { color: var(--c-cyan); text-decoration: none; }
a:hover { color: var(--c-white); }

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

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

.skip-link {
  position: fixed;
  top: 10px;
  left: 50%;
  z-index: 300;
  padding: 10px 22px;
  border-radius: var(--radius-pill);
  background: var(--c-cyan);
  color: var(--c-ink);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .1em;
  transform: translate(-50%, -180%);
  transition: transform .18s var(--ease);
}
.skip-link:focus,
.skip-link:focus-visible {
  transform: translate(-50%, 0);
  color: var(--c-ink);
}

/* ---------- 3. 通用排版与容器 ---------- */
.container {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--gutter);
}
.container--narrow { max-width: 920px; }

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

.mono {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--c-grey);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .2em;
  color: var(--c-cyan);
}
.eyebrow::before {
  content: "";
  width: 24px;
  height: 1px;
  background: currentColor;
}

.section-index {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--c-cyan);
}

.divider-rule {
  height: 1px;
  border: 0;
  margin: clamp(24px, 4vw, 48px) 0;
  background: linear-gradient(90deg, var(--c-border), transparent);
}

/* ---------- 4. 网格与面板 ---------- */
.layout-grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: clamp(16px, 2.2vw, 28px);
}

.grid-split {
  display: grid;
  grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  gap: clamp(20px, 3vw, 44px);
  align-items: start;
}

.panel {
  padding: clamp(18px, 2.4vw, 28px);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-lg);
  background:
    linear-gradient(160deg, rgba(27, 42, 74, .92), rgba(10, 16, 38, .92));
}

/* ---------- 5. 按钮与标签 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 13px 24px;
  border: 1px solid transparent;
  border-radius: var(--radius-pill);
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: .02em;
  cursor: pointer;
  text-decoration: none;
  transition: transform .18s var(--ease), box-shadow .18s var(--ease),
              background-color .18s var(--ease), border-color .18s var(--ease),
              color .18s var(--ease);
}
.btn:hover { transform: translateY(-2px); }

.btn--primary { background: var(--c-cyan); color: var(--c-ink); }
.btn--primary:hover {
  background: #5FF7DD;
  color: var(--c-ink);
  box-shadow: 0 14px 30px -16px var(--c-cyan);
}

.btn--accent { background: var(--c-orange); color: var(--c-ink); }
.btn--accent:hover {
  background: #FFA266;
  color: var(--c-ink);
  box-shadow: 0 14px 30px -16px var(--c-orange);
}

.btn--ghost {
  background: transparent;
  border-color: var(--c-border);
  color: var(--c-white);
}
.btn--ghost:hover { border-color: var(--c-cyan); color: var(--c-cyan); }

.btn--sm { padding: 9px 16px; font-size: 13px; }

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 11px;
  border: 1px solid var(--c-border);
  border-radius: var(--radius-pill);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .14em;
  color: var(--c-grey);
}
.tag--cyan { border-color: rgba(46, 242, 208, .45); color: var(--c-cyan); }
.tag--violet { border-color: rgba(139, 92, 246, .5); color: #C3A9FF; }
.tag--orange { border-color: rgba(255, 138, 61, .5); color: var(--c-orange); }

/* ---------- 6. 面包屑与正文 ---------- */
.breadcrumb { padding-bottom: clamp(14px, 2vw, 22px); }

.breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: rgba(167, 176, 200, .78);
}
.breadcrumb-list li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--c-border);
}
.breadcrumb-list a { color: var(--c-grey); }
.breadcrumb-list a:hover { color: var(--c-cyan); }
.breadcrumb-current { color: var(--c-white); }

.prose { max-width: 68ch; }
.prose p { margin-bottom: 1.1em; }
.prose h2, .prose h3 { margin: 1.6em 0 .6em; }
.prose ul, .prose ol { margin: 0 0 1.2em 1.2em; color: var(--c-grey); }
.prose li { margin-bottom: .4em; }
.prose strong { color: var(--c-white); font-weight: 600; }

/* ---------- 7. 图片容器基础规则 ---------- */
.media-frame {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  border: 1px solid var(--c-border);
  border-radius: var(--radius-lg);
  background:
    radial-gradient(120% 120% at 18% 0%, rgba(139, 92, 246, .38), transparent 62%),
    linear-gradient(160deg, #101A33, #070B16);
}
.media-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: .45;
  background: repeating-linear-gradient(180deg, rgba(5, 7, 15, .28) 0 1px, transparent 1px 3px);
}
.media-frame--wide { aspect-ratio: 21 / 9; }
.media-frame--tall { aspect-ratio: 4 / 5; }
.media-frame--square { aspect-ratio: 1 / 1; }
.media-frame--cut {
  border-radius: var(--radius-lg) var(--radius-lg) var(--radius-lg) 6px;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 32px), calc(100% - 32px) 100%, 0 100%);
}
.media-frame__caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 2;
  padding: 14px 18px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--c-white);
  background: linear-gradient(180deg, transparent, rgba(5, 7, 15, .9));
}
.media-frame__label {
  position: absolute;
  inset: 0;
  z-index: 1;
  display: grid;
  place-items: center;
  padding: 20px;
  text-align: center;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .2em;
  color: rgba(167, 176, 200, .7);
}

/* ---------- 8. 页头 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  color: var(--c-white);
  background: var(--c-ink);
  border-bottom: 1px solid var(--c-border);
}
.site-header[data-scrolled="true"] {
  border-bottom-color: rgba(46, 242, 208, .5);
  box-shadow: 0 20px 44px -34px rgba(46, 242, 208, .8);
}

.header-progress {
  position: absolute;
  left: 0;
  top: 0;
  z-index: 3;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--c-cyan), var(--c-violet));
  box-shadow: 0 0 12px rgba(46, 242, 208, .65);
}

.header-shell {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: clamp(12px, 2vw, 28px);
  width: 100%;
  max-width: var(--shell);
  min-height: 76px;
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.header-brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 8px 0;
  color: var(--c-white);
  text-decoration: none;
  flex: 0 0 auto;
}
.brand-mark {
  display: inline-grid;
  place-items: center;
  width: 36px;
  height: 36px;
  border-radius: 12px 12px 3px 12px;
  background: var(--c-cyan);
  color: var(--c-ink);
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .04em;
  transition: transform .18s var(--ease), background-color .18s var(--ease);
}
.header-brand:hover .brand-mark {
  transform: translateY(-2px);
  background: var(--c-white);
}
.brand-word {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 900;
  letter-spacing: .1em;
  color: var(--c-white);
}
.brand-edition {
  padding: 3px 9px;
  border: 1px solid var(--c-border);
  border-radius: var(--radius-pill);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .16em;
  color: var(--c-cyan);
}

.header-nav {
  display: flex;
  align-items: center;
  gap: clamp(10px, 1.6vw, 26px);
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 2px;
}

.nav-item { display: block; }

.nav-link {
  position: relative;
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  padding: 10px 13px;
  border-radius: var(--radius-md);
  font-size: 14px;
  font-weight: 500;
  color: var(--c-grey);
  text-decoration: none;
  transition: color .18s var(--ease), background-color .18s var(--ease),
              transform .18s var(--ease);
}
.nav-index {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .08em;
  color: rgba(167, 176, 200, .55);
  transition: color .18s var(--ease);
}
.nav-label { white-space: nowrap; }

.nav-link:hover,
.nav-link:focus-visible {
  color: var(--c-white);
  background: var(--c-steel);
  transform: translateY(-2px);
}
.nav-link:hover .nav-index,
.nav-link:focus-visible .nav-index { color: var(--c-cyan); }

.nav-link[aria-current="page"] {
  padding: 10px 20px;
  background: var(--c-cyan);
  color: var(--c-ink);
  font-weight: 600;
  clip-path: polygon(10px 0, 100% 0, calc(100% - 10px) 100%, 0 100%);
}
.nav-link[aria-current="page"] .nav-index { color: rgba(5, 7, 15, .62); }
.nav-link[aria-current="page"]:hover,
.nav-link[aria-current="page"]:focus-visible {
  background: var(--c-cyan);
  color: var(--c-ink);
  transform: none;
}

.nav-utility {
  display: flex;
  align-items: center;
  padding-left: clamp(8px, 1.2vw, 18px);
  border-left: 1px solid var(--c-border);
}

.cta-feedback {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 18px;
  border-radius: var(--radius-pill);
  background: var(--c-orange);
  color: var(--c-ink);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: .02em;
  white-space: nowrap;
  text-decoration: none;
  transition: transform .18s var(--ease), box-shadow .18s var(--ease),
              background-color .18s var(--ease);
}
.cta-feedback::after {
  content: "→";
  font-family: var(--font-mono);
  font-size: 12px;
}
.cta-feedback:hover,
.cta-feedback:focus-visible {
  background: #FFA266;
  color: var(--c-ink);
  transform: translateY(-2px);
  box-shadow: 0 12px 26px -14px var(--c-orange);
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  padding: 9px 15px;
  border: 1px solid var(--c-border);
  border-radius: var(--radius-pill);
  background: transparent;
  color: var(--c-white);
  cursor: pointer;
  transition: border-color .18s var(--ease), color .18s var(--ease),
              background-color .18s var(--ease);
}
.nav-toggle:hover,
.nav-toggle:focus-visible {
  border-color: var(--c-cyan);
  color: var(--c-cyan);
  background: rgba(46, 242, 208, .08);
}
.nav-toggle-text {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
}
.nav-toggle-bars {
  position: relative;
  display: block;
  width: 16px;
  height: 2px;
  border-radius: 2px;
  background: currentColor;
  transition: background-color .18s var(--ease);
}
.nav-toggle-bars::before,
.nav-toggle-bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 16px;
  height: 2px;
  border-radius: 2px;
  background: currentColor;
  transition: transform .18s var(--ease), top .18s var(--ease);
}
.nav-toggle-bars::before { top: -5px; }
.nav-toggle-bars::after { top: 5px; }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars { background: transparent; }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::before { top: 0; transform: rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::after { top: 0; transform: rotate(-45deg); }

.header-ticks,
.footer-ticks {
  height: 6px;
  background-image: repeating-linear-gradient(90deg, var(--c-border) 0 1px, transparent 1px 26px);
  opacity: .85;
}

.nav-scrim { display: none; }

/* ---------- 9. 页脚 ---------- */
.site-footer {
  position: relative;
  overflow: hidden;
  margin-top: clamp(56px, 8vw, 110px);
  color: var(--c-grey);
  background: linear-gradient(180deg, var(--c-ink), #04060D 72%);
  border-top: 1px solid var(--c-border);
}

.footer-shell {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding: clamp(32px, 4.6vw, 60px) var(--gutter) 0;
}

.footer-top {
  display: grid;
  grid-template-columns: minmax(0, 1.7fr) repeat(3, minmax(0, 1fr));
  gap: clamp(24px, 3.4vw, 48px);
  padding-bottom: clamp(26px, 3.6vw, 44px);
  border-bottom: 1px solid var(--c-border);
}

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

.footer-brand-line {
  font-family: var(--font-display);
  font-size: clamp(18px, 2.1vw, 24px);
  font-weight: 900;
  line-height: 1.25;
  letter-spacing: .02em;
  color: var(--c-white);
}

.footer-note {
  max-width: 34ch;
  margin-top: 12px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--c-grey);
}

.footer-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 20px;
}
.footer-badge {
  padding: 4px 11px;
  border: 1px solid var(--c-border);
  border-radius: var(--radius-pill);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .12em;
  color: var(--c-grey);
}
.footer-badge:first-child {
  border-color: rgba(72, 224, 138, .45);
  color: var(--c-green);
}

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

.footer-col-title {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 16px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: .18em;
  color: var(--c-white);
}
.footer-col-title::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 2px;
  background: var(--c-cyan);
}

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

.footer-link {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 6px 0;
  font-size: 14px;
  color: var(--c-grey);
  text-decoration: none;
  transition: color .18s var(--ease), transform .18s var(--ease);
}
.footer-link::before {
  content: "/";
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--c-border);
  transition: color .18s var(--ease);
}
.footer-link:hover,
.footer-link:focus-visible { color: var(--c-cyan); transform: translateX(3px); }
.footer-link:hover::before,
.footer-link:focus-visible::before { color: var(--c-cyan); }

.footer-contact-list { display: grid; gap: 12px; }
.footer-contact-item { display: grid; gap: 2px; }
.footer-contact-key {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .16em;
  color: rgba(167, 176, 200, .55);
}
.footer-contact-value {
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.5;
  color: var(--c-white);
  overflow-wrap: anywhere;
}

.footer-hours {
  margin-top: 16px;
  padding-left: 10px;
  border-left: 2px solid var(--c-violet);
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.7;
  letter-spacing: .04em;
  color: var(--c-grey);
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 20px 0 24px;
}

.footer-legal {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--c-grey);
}

.footer-copy {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .06em;
  color: rgba(167, 176, 200, .72);
}

.footer-actions { display: flex; align-items: center; gap: 10px; }

.footer-top-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  border: 1px solid var(--c-border);
  border-radius: var(--radius-pill);
  background: transparent;
  color: var(--c-white);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  cursor: pointer;
  transition: border-color .18s var(--ease), color .18s var(--ease),
              background-color .18s var(--ease), transform .18s var(--ease);
}
.footer-top-btn::before {
  content: "↑";
  font-size: 12px;
  color: var(--c-cyan);
}
.footer-top-btn:hover,
.footer-top-btn:focus-visible {
  border-color: var(--c-cyan);
  color: var(--c-cyan);
  background: rgba(46, 242, 208, .08);
  transform: translateY(-2px);
}

.footer-ghost {
  padding-bottom: 10px;
  font-family: var(--font-display);
  font-size: clamp(56px, 13vw, 168px);
  font-weight: 900;
  line-height: .82;
  letter-spacing: -.02em;
  text-align: right;
  color: rgba(46, 242, 208, .05);
  -webkit-text-stroke: 1px rgba(37, 52, 90, .9);
  user-select: none;
  pointer-events: none;
}

/* ---------- 10. JS 微交互钩子 ---------- */
.reveal-init {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity .5s var(--ease), transform .5s var(--ease);
}
.reveal-init.is-visible {
  opacity: 1;
  transform: none;
}

/* ---------- 11. 响应式 ---------- */
@media (max-width: 1180px) {
  .nav-link { padding: 9px 9px; font-size: 13px; }
  .nav-index { font-size: 9px; }
  .brand-edition { display: none; }
  .cta-feedback { padding: 9px 14px; font-size: 12px; }
}

@media (max-width: 1024px) {
  .nav-toggle { display: inline-flex; }

  .header-nav {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    z-index: 120;
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    width: min(360px, 88vw);
    padding: calc(84px + env(safe-area-inset-top, 0px)) 20px 28px;
    overflow-y: auto;
    background: linear-gradient(180deg, #070B18, var(--c-midnight) 62%);
    border-left: 1px solid var(--c-border);
    box-shadow: -40px 0 70px -40px rgba(0, 0, 0, .95);
    transform: translateX(103%);
    visibility: hidden;
    transition: transform .24s var(--ease), visibility .24s var(--ease);
  }
  .site-header[data-open="true"] .header-nav {
    transform: none;
    visibility: visible;
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
  }
  .nav-link {
    justify-content: flex-start;
    padding: 14px 14px;
    font-size: 16px;
    border: 1px solid transparent;
  }
  .nav-link:hover,
  .nav-link:focus-visible { transform: none; }
  .nav-index { font-size: 10px; }
  .nav-link[aria-current="page"] {
    padding: 14px 16px;
    border-radius: var(--radius-md);
    clip-path: none;
  }

  .nav-utility {
    margin-top: auto;
    padding: 20px 0 0;
    border-left: 0;
    border-top: 1px solid var(--c-border);
  }
  .cta-feedback {
    width: 100%;
    justify-content: center;
    padding: 14px 18px;
    font-size: 14px;
  }

  .nav-scrim {
    display: block;
    position: fixed;
    inset: 0;
    z-index: 110;
    background: rgba(5, 7, 15, .74);
    opacity: 0;
    visibility: hidden;
    transition: opacity .24s var(--ease), visibility .24s var(--ease);
  }
  .site-header[data-open="true"] .nav-scrim {
    opacity: 1;
    visibility: visible;
  }

  .footer-top { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-brand-block { grid-column: 1 / -1; }
}

@media (max-width: 880px) {
  .layout-grid { grid-template-columns: repeat(6, minmax(0, 1fr)); }
  .grid-split { grid-template-columns: 1fr; }
  .footer-ghost { text-align: left; }
}

@media (max-width: 620px) {
  .header-shell { min-height: 66px; }
  .brand-word { font-size: 17px; letter-spacing: .06em; }
  .brand-mark { width: 32px; height: 32px; font-size: 12px; }
  .nav-toggle { padding: 8px 13px; }

  .layout-grid { grid-template-columns: 1fr; }
  .footer-top { grid-template-columns: 1fr; gap: 28px; }
  .footer-bottom { justify-content: flex-start; }
  .footer-actions { width: 100%; }
  .footer-top-btn { width: 100%; justify-content: center; }
  .footer-ghost { font-size: clamp(44px, 17vw, 96px); }
}

/* ---------- 12. 焦点与减少动效 ---------- */
a:focus-visible,
button:focus-visible,
.btn:focus-visible {
  outline: 2px solid var(--c-cyan);
  outline-offset: 3px;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *,
  *::before,
  *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
    scroll-behavior: auto !important;
  }
  .reveal-init { opacity: 1; transform: none; }
}