/* ==========================================================================
   亿万国开服 · 共享样式表 /assets/site.css
   赛博国风开服大厅：暗夜基底 + 等高线暗纹 + 数据流光带 + 胶囊浮岛
   ========================================================================== */

/* ---------- 1. Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 108px;
}
body, h1, h2, h3, h4, h5, h6, p, figure, blockquote, dl, dd { margin: 0; }
ul, ol { margin: 0; padding: 0; list-style: none; }
img, svg, video { display: block; max-width: 100%; }
img { height: auto; }
button { font: inherit; color: inherit; background: none; border: 0; padding: 0; cursor: pointer; }
a { color: inherit; text-decoration: none; }
table { border-collapse: collapse; width: 100%; }
hr { border: 0; }
[hidden] { display: none !important; }

/* ---------- 2. 令牌 ---------- */
:root {
  --ink: #070A12;
  --deep: #0E1733;
  --indigo: #16203F;
  --cyan: #37F2E0;
  --violet: #8A5CFF;
  --gold: #FF9A3C;
  --jade: #3FE08A;
  --alert: #FF4D5E;
  --text: #EAF0FF;
  --muted: #9FB0D0;
  --line: #2C3A63;

  --shell: 1200px;
  --gutter: 20px;
  --header-h: 78px;

  --r-xs: 12px;
  --r-sm: 16px;
  --r-md: 20px;
  --r-lg: 28px;
  --r-xl: 36px;
  --r-pill: 999px;

  --fs-12: 0.75rem;
  --fs-14: 0.875rem;
  --fs-17: 1.0625rem;
  --fs-22: 1.375rem;
  --fs-32: 2rem;
  --fs-48: 3rem;
  --fs-72: 4.5rem;
  --fs-120: 7.5rem;

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

  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
  --shadow-sm: 0 10px 30px rgba(0, 0, 0, 0.35);
  --shadow-lg: 0 24px 60px rgba(0, 0, 0, 0.5);
}

/* ---------- 3. 基底与中文排版 ---------- */
body {
  min-height: 100vh;
  font-family: var(--font-sans);
  font-size: var(--fs-17);
  font-weight: 400;
  line-height: 1.85;
  color: var(--text);
  background-color: var(--ink);
  background-image:
    radial-gradient(1100px 640px at 86% -12%, rgba(138, 92, 255, 0.22), transparent 62%),
    radial-gradient(880px 560px at 4% 4%, rgba(55, 242, 224, 0.10), transparent 60%),
    radial-gradient(1000px 720px at 50% 106%, rgba(255, 154, 60, 0.09), transparent 62%),
    repeating-radial-gradient(circle at 82% 10%,
      rgba(44, 58, 99, 0) 0 39px, rgba(44, 58, 99, 0.28) 39px 40px);
  background-attachment: fixed, fixed, fixed, scroll;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
h1, h2, h3, h4 { font-weight: 800; line-height: 1.18; letter-spacing: -0.012em; }
p { text-wrap: pretty; }
::selection { background: rgba(55, 242, 224, 0.32); color: #04211F; }
:focus-visible { outline: 2px solid var(--cyan); outline-offset: 3px; border-radius: 6px; }

/* ---------- 4. 布局工具 ---------- */
.container {
  width: 100%;
  max-width: calc(var(--shell) + var(--gutter) * 2);
  margin-inline: auto;
  padding-inline: var(--gutter);
}
.section { padding-block: clamp(48px, 7vw, 110px); }
.stack > * + * { margin-top: var(--stack-gap, 16px); }
.muted { color: var(--muted); }
.lead { font-size: var(--fs-22); line-height: 1.6; color: var(--text); }
.num {
  font-family: var(--font-mono);
  font-weight: 700;
  letter-spacing: 0.06em;
  font-variant-numeric: tabular-nums;
}
.display {
  font-size: clamp(2.5rem, 8.4vw, var(--fs-120));
  font-weight: 300;
  line-height: 1.02;
  letter-spacing: -0.02em;
}
.display strong, .display b { font-weight: 900; }

.grid { display: grid; gap: clamp(18px, 2.4vw, 32px); }
.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.grid--auto { grid-template-columns: repeat(auto-fit, minmax(min(280px, 100%), 1fr)); }

/* ---------- 5. 跳转链接 ---------- */
.skip-link {
  position: absolute;
  left: 16px;
  top: -120px;
  z-index: 90;
  padding: 10px 20px;
  border-radius: var(--r-pill);
  background: var(--cyan);
  color: #04211F;
  font-size: var(--fs-14);
  font-weight: 700;
  transition: top 0.2s var(--ease);
}
.skip-link:focus { top: 14px; }

/* ---------- 6. 头部：悬浮胶囊浮岛 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  padding-top: 16px;
}
.scroll-progress {
  position: fixed;
  inset: 0 0 auto 0;
  height: 3px;
  z-index: 85;
  pointer-events: none;
  background: rgba(44, 58, 99, 0.35);
}
.scroll-progress__bar {
  display: block;
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--cyan), var(--violet) 55%, var(--gold));
  box-shadow: 0 0 14px rgba(55, 242, 224, 0.5);
}

.site-header__inner {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 8px 10px;
  border: 1px solid transparent;
  border-radius: var(--r-pill);
  transition: background 0.3s var(--ease), border-color 0.3s var(--ease),
    box-shadow 0.3s var(--ease), padding 0.3s var(--ease);
}
.site-header[data-scrolled] .site-header__inner {
  padding: 7px 10px;
  border-color: rgba(44, 58, 99, 0.75);
  background: linear-gradient(120deg, rgba(14, 23, 51, 0.94), rgba(7, 10, 18, 0.9));
  box-shadow: var(--shadow-lg);
  -webkit-backdrop-filter: blur(16px);
  backdrop-filter: blur(16px);
}

/* 品牌岛 */
.brand-island {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 9px 18px 9px 12px;
  border-radius: var(--r-pill);
  border: 1px solid rgba(44, 58, 99, 0.65);
  background: linear-gradient(130deg, rgba(22, 32, 63, 0.85), rgba(14, 23, 51, 0.6));
  transition: border-color 0.3s var(--ease), transform 0.3s var(--ease);
}
.brand-island:hover { border-color: rgba(55, 242, 224, 0.5); transform: translateY(-2px); }
.brand-island__mark {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border-radius: 12px;
  font-size: var(--fs-17);
  font-weight: 900;
  color: #04211F;
  background: linear-gradient(130deg, var(--cyan), var(--violet));
  box-shadow: 0 0 18px rgba(55, 242, 224, 0.35);
}
.brand-island__text { display: flex; flex-direction: column; line-height: 1.25; }
.brand-island__name { font-size: var(--fs-17); font-weight: 800; letter-spacing: 0.02em; }
.brand-island__tag { font-size: var(--fs-12); color: var(--muted); letter-spacing: 0.04em; }

/* 栏目岛 */
.nav-island {
  display: flex;
  align-items: center;
  padding: 5px;
  border-radius: var(--r-pill);
  border: 1px solid rgba(44, 58, 99, 0.6);
  background: rgba(14, 23, 51, 0.55);
}
.site-nav__list { display: flex; align-items: center; gap: 2px; }
.site-nav__item { display: block; }
.site-nav__link {
  display: inline-block;
  padding: 9px 14px;
  border-radius: var(--r-pill);
  font-size: var(--fs-14);
  color: var(--muted);
  white-space: nowrap;
  transition: color 0.25s var(--ease), background 0.25s var(--ease), box-shadow 0.25s var(--ease);
}
.site-nav__link:hover { color: var(--text); background: rgba(55, 242, 224, 0.08); }
.site-nav__link[aria-current="page"] {
  color: var(--cyan);
  background: linear-gradient(120deg, rgba(55, 242, 224, 0.16), rgba(138, 92, 255, 0.14));
  box-shadow: inset 0 0 0 1px rgba(55, 242, 224, 0.35);
}
.site-nav__cta-item { display: none; }

/* 折叠开关 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 8px;
  padding: 9px 16px;
  border-radius: var(--r-pill);
  border: 1px solid rgba(44, 58, 99, 0.8);
  background: rgba(22, 32, 63, 0.6);
  font-size: var(--fs-14);
  color: var(--text);
  transition: border-color 0.25s var(--ease), color 0.25s var(--ease);
}
.nav-toggle:hover { border-color: rgba(55, 242, 224, 0.55); }
.nav-toggle__bars { display: inline-flex; flex-direction: column; gap: 4px; }
.nav-toggle__bars span {
  display: block;
  width: 16px;
  height: 2px;
  border-radius: 2px;
  background: var(--cyan);
  transition: transform 0.26s var(--ease), width 0.26s var(--ease);
}
.nav-island[data-open] .nav-toggle__bars span:first-child { transform: translateY(3px) rotate(45deg); }
.nav-island[data-open] .nav-toggle__bars span:last-child { transform: translateY(-3px) rotate(-45deg); }
.nav-toggle__label { letter-spacing: 0.08em; }

/* 右侧区 */
.header-actions { display: flex; align-items: center; gap: 10px; margin-left: auto; }

.countdown-island {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 9px 16px;
  border-radius: var(--r-pill);
  border: 1px solid rgba(255, 154, 60, 0.35);
  background: linear-gradient(130deg, rgba(255, 154, 60, 0.12), rgba(14, 23, 51, 0.7));
}
.countdown-island__pulse {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--gold);
  box-shadow: 0 0 12px rgba(255, 154, 60, 0.8);
  animation: pulse 2.4s ease-in-out infinite;
}
.countdown-island__label { font-size: var(--fs-12); color: var(--muted); letter-spacing: 0.08em; }
.countdown-island__value {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: var(--fs-17);
  letter-spacing: 0.1em;
  color: var(--gold);
  font-variant-numeric: tabular-nums;
}
.countdown-island__value.is-tick { animation: tickUp 0.12s var(--ease); }

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(0.78); }
}
@keyframes tickUp {
  from { opacity: 0.3; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ---------- 7. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 20px;
  border-radius: var(--r-pill);
  border: 1px solid transparent;
  font-size: var(--fs-14);
  font-weight: 700;
  letter-spacing: 0.02em;
  white-space: nowrap;
  transition: transform 0.3s var(--ease), box-shadow 0.3s var(--ease),
    border-color 0.3s var(--ease), background 0.3s var(--ease), color 0.3s var(--ease);
}
.btn__no { font-family: var(--font-mono); font-size: 0.75em; letter-spacing: 0.12em; opacity: 0.65; }
.btn__arrow { font-weight: 700; transition: transform 0.3s var(--ease); }
.btn:hover { transform: translateY(-2px); }
.btn:hover .btn__arrow { transform: translateX(3px); }
.btn--primary {
  color: #21100A;
  background: linear-gradient(120deg, var(--gold), #FFC470);
  box-shadow: 0 10px 26px rgba(255, 154, 60, 0.28);
}
.btn--primary:hover { box-shadow: 0 14px 34px rgba(255, 154, 60, 0.4); }
.btn--ghost {
  color: var(--text);
  border-color: rgba(44, 58, 99, 0.9);
  background: rgba(22, 32, 63, 0.55);
}
.btn--ghost:hover { border-color: rgba(55, 242, 224, 0.55); color: var(--cyan); }
.btn--block { width: 100%; }

/* ---------- 8. 索引与标题组 ---------- */
.index-tag {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: var(--fs-12);
  font-weight: 400;
  letter-spacing: 0.22em;
  color: var(--muted);
  text-transform: uppercase;
}
.index-tag::before {
  content: "";
  width: 24px;
  height: 1px;
  background: linear-gradient(90deg, var(--cyan), transparent);
}
.section-head { display: flex; flex-direction: column; gap: 14px; margin-bottom: clamp(24px, 3.4vw, 48px); }
.section-head__title {
  font-size: clamp(1.9rem, 5vw, var(--fs-72));
  font-weight: 300;
  line-height: 1.06;
  letter-spacing: -0.02em;
}
.section-head__title strong { font-weight: 900; }
.section-head__title em {
  font-style: normal;
  background: linear-gradient(100deg, var(--cyan), var(--violet) 55%, var(--gold));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.section-head__note { max-width: 64ch; color: var(--muted); }

/* ---------- 9. 面包屑 ---------- */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: var(--fs-12);
  letter-spacing: 0.08em;
  color: var(--muted);
}
.breadcrumb__link { color: var(--muted); transition: color 0.25s var(--ease); }
.breadcrumb__link:hover { color: var(--cyan); }
.breadcrumb__sep { color: var(--line); }
.breadcrumb__current { color: var(--text); }

/* ---------- 10. 卡片 ---------- */
.card {
  --shift: 0px;
  position: relative;
  padding: clamp(20px, 2.4vw, 30px);
  border-radius: var(--r-lg);
  border: 1px solid rgba(44, 58, 99, 0.7);
  background: linear-gradient(150deg, rgba(22, 32, 63, 0.72), rgba(14, 23, 51, 0.5));
  transform: translateY(var(--shift));
  transition: transform 0.3s var(--ease), border-color 0.3s var(--ease), box-shadow 0.3s var(--ease);
}
.card:hover {
  transform: translateY(calc(var(--shift) - 4px));
  border-color: rgba(55, 242, 224, 0.45);
  box-shadow: var(--shadow-sm);
}
.card--shift { --shift: 28px; }
.card__tag {
  position: absolute;
  top: -11px;
  right: 20px;
  padding: 4px 12px;
  border-radius: var(--r-pill);
  border: 1px solid rgba(44, 58, 99, 0.9);
  background: var(--indigo);
  font-size: var(--fs-12);
  letter-spacing: 0.08em;
  color: var(--muted);
}
.card__title { font-size: var(--fs-22); font-weight: 700; }
.card__body { color: var(--muted); font-size: var(--fs-17); }

/* ---------- 11. 图片容器 ---------- */
.media {
  position: relative;
  overflow: hidden;
  border-radius: var(--r-lg);
  border: 1px solid rgba(44, 58, 99, 0.65);
  background: linear-gradient(150deg, var(--indigo) 0%, var(--ink) 72%);
  aspect-ratio: 16 / 9;
  isolation: isolate;
}
.media--wide { aspect-ratio: 21 / 9; }
.media--square { aspect-ratio: 1 / 1; }
.media--tall { aspect-ratio: 4 / 5; }
.media__img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.media__tag {
  position: absolute;
  top: 14px;
  right: 14px;
  z-index: 2;
  padding: 4px 12px;
  border-radius: var(--r-pill);
  border: 1px solid rgba(55, 242, 224, 0.4);
  background: rgba(7, 10, 18, 0.72);
  font-size: var(--fs-12);
  letter-spacing: 0.1em;
  color: var(--cyan);
}
.media__caption {
  position: absolute;
  inset: auto 0 0 0;
  z-index: 2;
  padding: 18px;
  font-size: var(--fs-14);
  color: var(--muted);
  background: linear-gradient(0deg, rgba(7, 10, 18, 0.92), transparent);
}

/* ---------- 12. 筛选胶囊 ---------- */
.chip-set { display: flex; flex-wrap: wrap; gap: 8px; }
.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 15px;
  border-radius: var(--r-pill);
  border: 1px solid rgba(44, 58, 99, 0.9);
  background: rgba(14, 23, 51, 0.6);
  font-size: var(--fs-14);
  color: var(--muted);
  transition: color 0.25s var(--ease), border-color 0.25s var(--ease), background 0.25s var(--ease);
}
.chip:hover { color: var(--text); border-color: rgba(55, 242, 224, 0.5); }
.chip[aria-pressed="true"] {
  color: #04211F;
  font-weight: 700;
  border-color: var(--cyan);
  background: var(--cyan);
  box-shadow: 0 0 20px rgba(55, 242, 224, 0.28);
}

/* ---------- 13. 可展开内容组 ---------- */
.disclosure {
  overflow: hidden;
  border-radius: var(--r-md);
  border: 1px solid rgba(44, 58, 99, 0.7);
  background: linear-gradient(150deg, rgba(22, 32, 63, 0.55), rgba(14, 23, 51, 0.4));
}
.disclosure + .disclosure { margin-top: 12px; }
.disclosure__summary {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px 20px;
  font-size: var(--fs-17);
  font-weight: 600;
  cursor: pointer;
  list-style: none;
}
.disclosure__summary::-webkit-details-marker { display: none; }
.disclosure__summary::after {
  content: "";
  width: 9px;
  height: 9px;
  margin-left: auto;
  border-right: 2px solid var(--cyan);
  border-bottom: 2px solid var(--cyan);
  transform: rotate(45deg);
  transition: transform 0.26s var(--ease);
}
.disclosure[open] .disclosure__summary::after { transform: rotate(-135deg); }
.disclosure__body {
  padding: 0 20px 20px;
  font-size: var(--fs-17);
  line-height: 1.6;
  color: var(--muted);
}
.disclosure[open] .disclosure__body { animation: unfold 0.26s var(--ease); }
@keyframes unfold {
  from { opacity: 0; transform: translateY(-6px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ---------- 14. 状态灯 ---------- */
.status-dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--muted);
  vertical-align: middle;
}
.status-dot--live { background: var(--cyan); animation: pulse 2.4s ease-in-out infinite; }
.status-dot--soon { background: var(--gold); animation: pulse 2.4s ease-in-out infinite; }
.status-dot--full { background: var(--alert); }
.status-dot--stable { background: var(--jade); }

/* ---------- 15. 锚点索引 / 长文 ---------- */
.toc {
  position: sticky;
  top: calc(var(--header-h) + 20px);
  display: flex;
  flex-direction: column;
  gap: 2px;
  font-size: var(--fs-14);
}
.toc__link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 7px 12px;
  border-radius: var(--r-pill);
  border-left: 2px solid transparent;
  color: var(--muted);
  transition: color 0.25s var(--ease), background 0.25s var(--ease);
}
.toc__link:hover { color: var(--text); }
.toc__link.is-active {
  color: var(--cyan);
  background: rgba(55, 242, 224, 0.08);
}
.toc__no { font-family: var(--font-mono); font-size: var(--fs-12); opacity: 0.7; }

.prose {
  max-width: 72ch;
  font-size: var(--fs-17);
  line-height: 1.6;
  color: var(--muted);
}
.prose > * + * { margin-top: 1em; }
.prose h2, .prose h3 { color: var(--text); font-weight: 700; margin-top: 1.9em; line-height: 1.3; }
.prose h3 { font-size: var(--fs-22); }
.prose ul { list-style: disc; padding-left: 1.4em; }
.prose ol { list-style: decimal; padding-left: 1.4em; }
.prose li + li { margin-top: 0.4em; }
.prose a { color: var(--cyan); text-decoration: underline; text-underline-offset: 3px; }
.prose strong { color: var(--text); }

/* ---------- 16. 装饰光带与显现 ---------- */
.flow-band {
  position: absolute;
  left: -20%;
  right: -20%;
  top: 0;
  height: 1px;
  pointer-events: none;
  background: linear-gradient(90deg, transparent, rgba(55, 242, 224, 0.6), rgba(138, 92, 255, 0.5), transparent);
  animation: drift 40s linear infinite;
}
@keyframes drift {
  from { transform: translateX(-12%); }
  to { transform: translateX(12%); }
}
.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}
.reveal.is-visible { opacity: 1; transform: none; }
.reveal--delay-1 { transition-delay: 0.08s; }
.reveal--delay-2 { transition-delay: 0.16s; }
.reveal--delay-3 { transition-delay: 0.24s; }

/* ---------- 17. 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(72px, 10vw, 140px);
  padding-block: clamp(48px, 7vw, 88px) 34px;
  border-top: 1px solid rgba(44, 58, 99, 0.6);
  background: linear-gradient(180deg, rgba(14, 23, 51, 0.7), rgba(7, 10, 18, 0.96) 62%);
}
.site-footer::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(55, 242, 224, 0.7), rgba(138, 92, 255, 0.6), transparent);
}
.site-footer__inner { display: flex; flex-direction: column; }
.site-footer__top {
  display: grid;
  grid-template-columns: 1.15fr 2fr;
  gap: clamp(32px, 5vw, 72px);
}
.footer-brand { display: flex; flex-direction: column; gap: 12px; }
.footer-brand__mark {
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  border-radius: 14px;
  font-weight: 900;
  color: #04211F;
  background: linear-gradient(130deg, var(--cyan), var(--violet));
}
.footer-brand__name { font-size: var(--fs-17); font-weight: 800; letter-spacing: 0.01em; }
.footer-brand__line { font-size: var(--fs-14); color: var(--muted); line-height: 1.8; max-width: 34ch; }
.footer-brand__hint {
  font-size: var(--fs-12);
  line-height: 1.8;
  color: var(--muted);
  padding: 10px 14px;
  border-radius: var(--r-sm);
  border: 1px dashed rgba(44, 58, 99, 0.9);
  background: rgba(22, 32, 63, 0.32);
}
.footer-cols {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 24px;
}
.footer-col { display: flex; flex-direction: column; gap: 12px; }
.footer-col__title {
  font-size: var(--fs-12);
  font-weight: 400;
  letter-spacing: 0.2em;
  color: var(--muted);
  text-transform: uppercase;
}
.footer-col__list { display: flex; flex-direction: column; gap: 8px; }
.footer-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: var(--fs-14);
  color: var(--text);
  transition: color 0.25s var(--ease), transform 0.25s var(--ease);
}
.footer-link::before {
  content: "";
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--line);
  transition: background 0.25s var(--ease);
}
.footer-link:hover { color: var(--cyan); transform: translateX(3px); }
.footer-link:hover::before { background: var(--cyan); }
.footer-contact {
  margin-top: clamp(28px, 4vw, 48px);
  padding-top: 22px;
  border-top: 1px dashed rgba(44, 58, 99, 0.75);
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.footer-contact__line { font-size: var(--fs-14); color: var(--muted); }
.footer-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 22px;
  margin-top: 20px;
  padding-top: 18px;
  border-top: 1px solid rgba(44, 58, 99, 0.5);
  font-size: var(--fs-12);
  letter-spacing: 0.06em;
  color: var(--muted);
}
.footer-meta__copy { color: var(--text); }
.footer-meta__icp { font-family: var(--font-mono); letter-spacing: 0.04em; }
.footer-meta__note { opacity: 0.85; }

/* 右下角反馈信标 */
.feedback-dock {
  position: fixed;
  right: 18px;
  bottom: 18px;
  z-index: 70;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  width: min(320px, calc(100vw - 36px));
}
.feedback-dock__summary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 18px;
  border-radius: var(--r-pill);
  border: 1px solid rgba(55, 242, 224, 0.45);
  background: linear-gradient(130deg, rgba(14, 23, 51, 0.97), rgba(22, 32, 63, 0.97));
  box-shadow: var(--shadow-sm);
  font-size: var(--fs-14);
  color: var(--text);
  cursor: pointer;
  list-style: none;
  transition: border-color 0.3s var(--ease), transform 0.3s var(--ease);
}
.feedback-dock__summary::-webkit-details-marker { display: none; }
.feedback-dock__summary:hover { border-color: var(--cyan); transform: translateY(-2px); }
.feedback-dock__dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--cyan);
  animation: pulse 2.4s ease-in-out infinite;
}
.feedback-dock__text { letter-spacing: 0.1em; }
.feedback-dock__panel {
  width: 100%;
  margin-top: 10px;
  padding: 18px;
  border-radius: var(--r-md);
  border: 1px solid rgba(44, 58, 99, 0.9);
  background: linear-gradient(160deg, rgba(14, 23, 51, 0.99), rgba(7, 10, 18, 0.99));
  box-shadow: var(--shadow-lg);
  animation: unfold 0.26s var(--ease);
}
.feedback-dock__title { font-size: var(--fs-17); font-weight: 700; margin-bottom: 8px; }
.feedback-dock__body { font-size: var(--fs-14); line-height: 1.7; color: var(--muted); }
.feedback-dock__body + .feedback-dock__body { margin-top: 6px; }
.feedback-dock__panel .btn { margin-top: 14px; }

/* ---------- 18. 响应式 ---------- */
@media (max-width: 1180px) {
  .header-actions__cta { display: none; }
  .site-nav__link { padding: 9px 11px; }
}
@media (max-width: 980px) {
  .grid--3, .grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .site-footer__top { grid-template-columns: 1fr; }
}
@media (max-width: 900px) {
  :root { --header-h: 74px; }
  .site-header { padding-top: 10px; }
  .nav-toggle { display: inline-flex; }
  .nav-island { order: 3; padding: 4px; }
  .header-actions { order: 2; }
  .site-nav__list {
    position: fixed;
    left: 16px;
    right: 16px;
    top: calc(var(--header-h) + 12px);
    max-height: calc(100vh - var(--header-h) - 40px);
    overflow-y: auto;
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
    padding: 14px;
    border-radius: var(--r-lg);
    border: 1px solid rgba(44, 58, 99, 0.9);
    background: linear-gradient(160deg, rgba(14, 23, 51, 0.99), rgba(7, 10, 18, 0.99));
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transform: translateY(-12px);
    transition: opacity 0.26s var(--ease), transform 0.26s var(--ease), visibility 0.26s;
  }
  .nav-island[data-open] .site-nav__list {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transform: translateY(0);
  }
  .site-nav__link { display: block; padding: 12px 14px; font-size: var(--fs-17); }
  .site-nav__cta-item { display: block; margin-top: 6px; }
  .site-nav__cta-item + .site-nav__cta-item { margin-top: 8px; }
  .toc { position: static; }
}
@media (max-width: 760px) {
  .footer-cols { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 640px) {
  :root { --gutter: 16px; }
  body { font-size: 1rem; }
  .brand-island__tag { display: none; }
  .countdown-island__label { display: none; }
  .brand-island { padding: 8px 14px 8px 10px; }
  .countdown-island { padding: 8px 14px; }
  .grid--2, .grid--3, .grid--4 { grid-template-columns: 1fr; }
  .card--shift { --shift: 0px; }
  .feedback-dock { right: 12px; bottom: 12px; }
  .feedback-dock__summary { padding: 9px 15px; }
}
@media (max-width: 420px) {
  .nav-toggle__label { display: none; }
  .footer-cols { grid-template-columns: 1fr; }
}

/* ---------- 19. 降低动效 ---------- */
@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;
  }
  .reveal { opacity: 1; transform: none; }
  .flow-band { animation: none; }
}