/* ============================================================
   828娱乐 · Site Kit 共享样式 /assets/site.css
   深海夜底 + 玻璃层 + 实色舱体蓝 · 等宽索引 · 霓虹青路径
   ============================================================ */

:root {
  --s828-bg: #05141F;
  --s828-layer: #0B2436;
  --s828-line: #1C3F58;
  --s828-cyan: #3DE8D2;
  --s828-cyan-dim: #1FA898;
  --s828-coral: #FF7A55;
  --s828-amber: #FFC24B;
  --s828-ink: #F4F8FB;
  --s828-muted: #9FB3C4;
  --s828-grid: #12314A;
  --s828-glass: rgba(11, 36, 54, 0.74);
  --s828-glass-soft: rgba(28, 63, 88, 0.38);
  --s828-radius: 12px;
  --s828-radius-lg: 20px;
  --s828-wrap: 1200px;
  --s828-gutter: clamp(16px, 4vw, 40px);
  --s828-display: clamp(38px, 7vw, 96px);
  --s828-font-display: "Helvetica Neue", "Arial Black", Inter, system-ui, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --s828-font-body: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --s828-font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
  --s828-ease: cubic-bezier(0.2, 0.7, 0.2, 1);
  --s828-bar-h: 64px;
}

*,
*::before,
*::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 120px;
}

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

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

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

button { font: inherit; color: inherit; }

a { color: var(--s828-cyan); text-decoration: none; }

body {
  min-height: 100vh;
  background-color: var(--s828-bg);
  background-image:
    linear-gradient(90deg, rgba(18, 49, 74, 0.5) 1px, transparent 1px),
    linear-gradient(0deg, rgba(18, 49, 74, 0.32) 1px, transparent 1px);
  background-size: 24px 24px;
  background-position: -1px -1px;
  color: var(--s828-ink);
  font-family: var(--s828-font-body);
  font-size: 16px;
  line-height: 1.85;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

main { display: block; }

:where(a, button, summary, input, select, textarea, [tabindex]):focus-visible {
  outline: 2px solid var(--s828-cyan);
  outline-offset: 3px;
}

/* ---------- 可访问性工具 ---------- */
.s828-sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

.s828-skip {
  position: absolute;
  left: 12px;
  top: -80px;
  z-index: 400;
  padding: 12px 18px;
  border-radius: 10px;
  background: var(--s828-cyan);
  color: #05141F;
  font: 700 14px/1 var(--s828-font-body);
  transition: top 0.2s var(--s828-ease);
}

.s828-skip:focus { top: 12px; }

/* ---------- 顶部状态带 ---------- */
.s828-header {
  position: sticky;
  top: 0;
  z-index: 120;
  background: var(--s828-glass);
  -webkit-backdrop-filter: blur(14px) saturate(140%);
  backdrop-filter: blur(14px) saturate(140%);
  border-bottom: 1px solid var(--s828-line);
  transition: border-color 0.25s var(--s828-ease), box-shadow 0.25s var(--s828-ease);
}

.s828-header.is-scrolled {
  border-bottom-color: rgba(61, 232, 210, 0.3);
  box-shadow: 0 20px 44px -30px rgba(0, 0, 0, 0.95);
}

.s828-statusbar {
  background: linear-gradient(90deg, rgba(11, 36, 54, 0.96), rgba(18, 49, 74, 0.62));
  border-bottom: 1px solid rgba(28, 63, 88, 0.8);
  font-family: var(--s828-font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.08em;
  color: var(--s828-muted);
}

.s828-statusbar__inner {
  max-width: var(--s828-wrap);
  margin: 0 auto;
  min-height: 40px;
  padding: 4px var(--s828-gutter);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px 18px;
  flex-wrap: wrap;
}

.s828-statusbar__group {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.s828-statusbar__group--end { justify-content: flex-end; }

.s828-statusbar__item {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  white-space: nowrap;
}

.s828-statusbar__dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--s828-cyan);
  box-shadow: 0 0 0 3px rgba(61, 232, 210, 0.16);
  flex: none;
}

/* ---------- 命令栏 ---------- */
.s828-header__inner {
  position: relative;
  max-width: var(--s828-wrap);
  margin: 0 auto;
  padding: 0 var(--s828-gutter);
  height: var(--s828-bar-h);
  display: flex;
  align-items: center;
  gap: 14px;
}

.s828-brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--s828-ink);
  flex: none;
}

.s828-brand__mark {
  width: 34px;
  height: 34px;
  display: grid;
  place-items: center;
  border-radius: 9px;
  border: 1px solid rgba(61, 232, 210, 0.5);
  background: linear-gradient(150deg, rgba(61, 232, 210, 0.24), rgba(11, 36, 54, 0.92));
  color: var(--s828-cyan);
  font-family: var(--s828-font-mono);
  font-size: 15px;
  font-weight: 700;
  line-height: 1;
  flex: none;
}

.s828-brand__text { display: flex; flex-direction: column; gap: 1px; line-height: 1.1; }

.s828-brand__name {
  font-family: var(--s828-font-display);
  font-weight: 800;
  font-size: 17px;
  letter-spacing: -0.01em;
}

.s828-brand__tag {
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--s828-muted);
}

.s828-nav { margin-left: auto; }

.s828-nav__list {
  display: flex;
  align-items: center;
  gap: 2px;
  flex-wrap: wrap;
}

.s828-nav__link {
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  min-height: 40px;
  padding: 8px 11px;
  border-radius: 9px;
  border: 1px solid transparent;
  color: var(--s828-muted);
  font-size: 14px;
  font-weight: 500;
  white-space: nowrap;
  transition: color 0.2s var(--s828-ease), background-color 0.2s var(--s828-ease), border-color 0.2s var(--s828-ease);
}

.s828-nav__index {
  font-family: var(--s828-font-mono);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.08em;
  color: var(--s828-cyan-dim);
}

.s828-nav__link:hover {
  color: var(--s828-ink);
  background: rgba(61, 232, 210, 0.08);
  border-color: rgba(61, 232, 210, 0.22);
}

.s828-nav__link[aria-current="page"] {
  color: var(--s828-ink);
  background: rgba(61, 232, 210, 0.13);
  border-color: rgba(61, 232, 210, 0.42);
}

.s828-nav__link[aria-current="page"] .s828-nav__index { color: var(--s828-cyan); }

.s828-header__actions {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-left: 6px;
  flex: none;
}

/* ---------- 移动导航按钮 ---------- */
.s828-nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  min-width: 44px;
  min-height: 44px;
  padding: 0 12px;
  border-radius: 10px;
  border: 1px solid var(--s828-line);
  background: rgba(11, 36, 54, 0.82);
  color: var(--s828-ink);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  margin-left: auto;
}

.s828-nav-toggle__bars {
  display: inline-flex;
  flex-direction: column;
  gap: 3px;
  width: 18px;
}

.s828-nav-toggle__bars span {
  display: block;
  height: 2px;
  width: 100%;
  border-radius: 2px;
  background: currentColor;
  transition: transform 0.22s var(--s828-ease), opacity 0.22s var(--s828-ease);
}

.s828-header[data-open] .s828-nav-toggle {
  border-color: rgba(61, 232, 210, 0.5);
  color: var(--s828-cyan);
}

.s828-header[data-open] .s828-nav-toggle__bars span:nth-child(1) { transform: translateY(5px) rotate(45deg); }
.s828-header[data-open] .s828-nav-toggle__bars span:nth-child(2) { opacity: 0; }
.s828-header[data-open] .s828-nav-toggle__bars span:nth-child(3) { transform: translateY(-5px) rotate(-45deg); }

/* ---------- 滚动进度 ---------- */
.s828-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  overflow: hidden;
  pointer-events: none;
}

.s828-progress__bar {
  display: block;
  height: 100%;
  width: 100%;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--s828-cyan), var(--s828-cyan-dim) 55%, var(--s828-coral));
  transition: transform 0.14s linear;
}

/* ---------- 按钮 ---------- */
.s828-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 44px;
  padding: 0 18px;
  border-radius: 10px;
  border: 1px solid transparent;
  font-family: var(--s828-font-body);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.01em;
  line-height: 1.2;
  text-align: center;
  cursor: pointer;
  transition: background-color 0.2s var(--s828-ease), color 0.2s var(--s828-ease), border-color 0.2s var(--s828-ease), transform 0.2s var(--s828-ease);
}

.s828-btn--primary {
  background: var(--s828-cyan);
  border-color: var(--s828-cyan);
  color: #05141F;
}

.s828-btn--primary:hover { background: #66f2e2; border-color: #66f2e2; }

.s828-btn--coral {
  background: var(--s828-coral);
  border-color: var(--s828-coral);
  color: #05141F;
}

.s828-btn--coral:hover { background: #ff9274; border-color: #ff9274; }

.s828-btn--ghost {
  background: rgba(244, 248, 251, 0.03);
  border-color: var(--s828-line);
  color: var(--s828-ink);
}

.s828-btn--ghost:hover {
  border-color: var(--s828-cyan);
  color: var(--s828-cyan);
  background: rgba(61, 232, 210, 0.08);
}

.s828-btn--sm {
  min-height: 38px;
  padding: 0 14px;
  font-size: 13px;
}

.s828-btn:active { transform: translateY(1px); }

/* ---------- 布局容器 ---------- */
.s828-wrap {
  width: 100%;
  max-width: var(--s828-wrap);
  margin-inline: auto;
  padding-inline: var(--s828-gutter);
}

.s828-section {
  position: relative;
  padding-block: clamp(48px, 7vw, 96px);
}

.s828-section--tight { padding-block: clamp(28px, 4vw, 48px); }

.s828-section--edge {
  border-top: 1px solid var(--s828-line);
  border-bottom: 1px solid var(--s828-line);
  background: linear-gradient(180deg, rgba(11, 36, 54, 0.55), rgba(5, 20, 31, 0.2));
}

.s828-grid {
  display: grid;
  gap: clamp(16px, 2.2vw, 28px);
}

.s828-grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.s828-grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.s828-grid--split { grid-template-columns: minmax(0, 4fr) minmax(0, 8fr); }

/* ---------- 文字层级 ---------- */
.s828-eyebrow {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--s828-font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--s828-muted);
}

.s828-eyebrow::before {
  content: "";
  width: 24px;
  height: 1px;
  background: var(--s828-cyan);
  flex: none;
}

.s828-h1 {
  font-family: var(--s828-font-display);
  font-weight: 900;
  font-size: var(--s828-display);
  line-height: 0.98;
  letter-spacing: -0.03em;
  color: var(--s828-ink);
  margin-block: 0.24em 0.3em;
  text-wrap: balance;
}

.s828-h2 {
  font-family: var(--s828-font-display);
  font-weight: 800;
  font-size: clamp(24px, 3.4vw, 40px);
  line-height: 1.14;
  letter-spacing: -0.02em;
  color: var(--s828-ink);
  margin-block: 0.3em 0.5em;
}

.s828-h3 {
  font-family: var(--s828-font-display);
  font-weight: 700;
  font-size: clamp(17px, 1.9vw, 22px);
  line-height: 1.35;
  letter-spacing: -0.01em;
}

.s828-lede {
  max-width: 60ch;
  color: var(--s828-muted);
  font-size: clamp(15px, 1.5vw, 18px);
  line-height: 1.85;
}

.s828-mono {
  font-family: var(--s828-font-mono);
  font-weight: 500;
  letter-spacing: 0.04em;
}

.s828-num {
  font-family: var(--s828-font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.12em;
  color: var(--s828-cyan-dim);
}

.s828-prose { max-width: 62ch; }

.s828-prose p { margin-block: 0 1.2em; color: #D8E4EE; }
.s828-prose p:last-child { margin-bottom: 0; }
.s828-prose strong { color: var(--s828-ink); font-weight: 700; }
.s828-prose ul { list-style: disc; padding-left: 1.3em; margin-block: 0 1.2em; }
.s828-prose li { margin-block: 0.3em; }
.s828-prose a { border-bottom: 1px solid rgba(61, 232, 210, 0.4); }

/* ---------- 面板与状态标记 ---------- */
.s828-panel {
  position: relative;
  padding: clamp(16px, 2.4vw, 28px);
  border: 1px solid var(--s828-line);
  border-radius: var(--s828-radius-lg);
}

.s828-panel--glass {
  background: linear-gradient(160deg, var(--s828-glass-soft), rgba(11, 36, 54, 0.58));
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  box-shadow: inset 0 1px 0 rgba(159, 179, 196, 0.12);
}

.s828-panel--solid { background: var(--s828-layer); }

.s828-panel__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 14px;
}

.s828-panel__title {
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.01em;
}

.s828-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border-radius: 999px;
  border: 1px solid var(--s828-line);
  background: rgba(11, 36, 54, 0.66);
  color: var(--s828-muted);
  font-family: var(--s828-font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.08em;
  line-height: 1.5;
  white-space: nowrap;
}

.s828-chip--cyan { background: var(--s828-cyan); border-color: var(--s828-cyan); color: #05141F; }
.s828-chip--coral { background: var(--s828-coral); border-color: var(--s828-coral); color: #05141F; }
.s828-chip--amber { background: var(--s828-amber); border-color: var(--s828-amber); color: #05141F; }

.s828-chip--outline-cyan {
  background: rgba(61, 232, 210, 0.1);
  border-color: rgba(61, 232, 210, 0.45);
  color: var(--s828-cyan);
}

/* ---------- 目录索引列表 ---------- */
.s828-indexlist {
  display: grid;
  border-top: 1px solid var(--s828-line);
}

.s828-indexlist__link {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 14px;
  padding: 15px 8px;
  border-bottom: 1px solid var(--s828-line);
  color: var(--s828-ink);
  transition: background-color 0.2s var(--s828-ease), color 0.2s var(--s828-ease), padding-left 0.2s var(--s828-ease);
}

.s828-indexlist__link:hover,
.s828-indexlist__link.is-active {
  background: rgba(61, 232, 210, 0.07);
  color: var(--s828-cyan);
  padding-left: 14px;
}

.s828-indexlist__num {
  font-family: var(--s828-font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--s828-cyan-dim);
}

.s828-indexlist__text { font-size: 15px; font-weight: 600; }

.s828-indexlist__meta {
  font-family: var(--s828-font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--s828-muted);
}

/* ---------- 面包屑 ---------- */
.s828-crumbs { padding-top: 20px; }

.s828-crumbs__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--s828-font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.12em;
  color: var(--s828-muted);
}

.s828-crumbs__link { color: var(--s828-muted); }
.s828-crumbs__link:hover { color: var(--s828-cyan); }
.s828-crumbs__sep { color: var(--s828-line); }
.s828-crumbs__item[aria-current="page"] { color: var(--s828-ink); }

/* ---------- 表格基础 ---------- */
.s828-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
  line-height: 1.7;
}

.s828-table caption {
  caption-side: bottom;
  padding-top: 10px;
  font-size: 12px;
  color: var(--s828-muted);
  text-align: left;
}

.s828-table th,
.s828-table td {
  padding: 12px 14px;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--s828-line);
}

.s828-table thead th {
  background: rgba(11, 36, 54, 0.9);
  color: var(--s828-muted);
  font-family: var(--s828-font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.12em;
  white-space: nowrap;
}

.s828-table tbody tr:nth-child(odd) { background: rgba(18, 49, 74, 0.24); }

/* ---------- 图片容器基础规则 ---------- */
.s828-media {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--s828-line);
  border-radius: var(--s828-radius);
  background: linear-gradient(150deg, #0B2436, #05141F 70%);
  aspect-ratio: 16 / 10;
  margin: 0;
}

.s828-media--wide { aspect-ratio: 21 / 9; }
.s828-media--tall { aspect-ratio: 4 / 5; }
.s828-media--square { aspect-ratio: 1 / 1; }

.s828-media > img,
.s828-media > picture,
.s828-media > picture > img,
.s828-media > video {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.s828-media > picture { display: block; }

.s828-media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(5, 20, 31, 0) 52%, rgba(5, 20, 31, 0.74) 100%);
  pointer-events: none;
}

.s828-media__caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 1;
  padding: 12px 16px;
  font-family: var(--s828-font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--s828-muted);
}

/* ---------- 滚动显现 ---------- */
[data-reveal] {
  transition: opacity 0.42s var(--s828-ease), transform 0.42s var(--s828-ease);
  transition-delay: var(--s828-delay, 0ms);
}

.s828-js [data-reveal] {
  opacity: 0;
  transform: translateY(16px);
}

.s828-js [data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

/* ---------- 页脚 ---------- */
.s828-footer {
  position: relative;
  margin-top: clamp(48px, 8vw, 110px);
  border-top: 1px solid var(--s828-line);
  background: linear-gradient(180deg, #05141F 0%, #0B2436 58%, #05141F 100%);
}

.s828-footer::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: -1px;
  height: 1px;
  background: linear-gradient(90deg, rgba(61, 232, 210, 0), rgba(61, 232, 210, 0.7) 28%, rgba(255, 122, 85, 0.55) 72%, rgba(255, 122, 85, 0));
}

.s828-footer__grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1.1fr 1fr;
  gap: clamp(22px, 3.4vw, 48px);
  padding-block: clamp(36px, 5vw, 64px) clamp(24px, 3vw, 40px);
}

.s828-footer__col { min-width: 0; }

.s828-brand--footer { margin-bottom: 14px; }

.s828-footer__desc {
  color: var(--s828-muted);
  font-size: 14px;
  line-height: 1.8;
  max-width: 30ch;
}

.s828-footer__status {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 14px;
  padding: 6px 12px;
  border: 1px solid rgba(61, 232, 210, 0.28);
  border-radius: 999px;
  background: rgba(61, 232, 210, 0.07);
  color: var(--s828-muted);
  font-family: var(--s828-font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
}

.s828-footer__title {
  font-family: var(--s828-font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--s828-muted);
  margin-bottom: 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--s828-line);
}

.s828-footer__list { display: grid; gap: 10px; }

.s828-footer__link {
  color: var(--s828-ink);
  font-size: 14px;
  transition: color 0.2s var(--s828-ease);
}

.s828-footer__link:hover { color: var(--s828-cyan); }

.s828-footer__item { display: grid; gap: 2px; }

.s828-footer__label {
  font-family: var(--s828-font-mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--s828-muted);
}

.s828-footer__text {
  font-size: 14px;
  color: #D8E4EE;
  word-break: break-word;
}

.s828-copy {
  display: inline;
  padding: 0;
  border: 0;
  border-bottom: 1px dashed rgba(159, 179, 196, 0.42);
  background: none;
  color: #D8E4EE;
  font-family: inherit;
  font-size: 14px;
  line-height: 1.7;
  text-align: left;
  word-break: break-all;
  cursor: pointer;
  transition: color 0.2s var(--s828-ease), border-color 0.2s var(--s828-ease);
}

.s828-copy:hover { color: var(--s828-cyan); border-bottom-color: var(--s828-cyan); }

.s828-copy.is-copied {
  color: var(--s828-cyan);
  border-bottom-color: var(--s828-cyan);
}

.s828-footer__bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px 20px;
  padding-block: 18px 26px;
  border-top: 1px solid var(--s828-line);
}

.s828-footer__copy,
.s828-footer__note {
  font-family: var(--s828-font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--s828-muted);
}

/* ---------- 平板 ---------- */
@media (max-width: 1080px) {
  .s828-nav__link { font-size: 13px; padding: 8px 8px; }
  .s828-footer__grid { grid-template-columns: 1.2fr 1fr 1fr; }
  .s828-footer__col--brand { grid-column: 1 / -1; }
}

/* ---------- 移动导航 ---------- */
@media (max-width: 900px) {
  :root { --s828-bar-h: 60px; }

  .s828-nav-toggle { display: inline-flex; }

  .s828-header__actions { margin-left: 0; }

  .s828-nav {
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    display: none;
    margin-left: 0;
    padding: 10px var(--s828-gutter) 20px;
    background: rgba(5, 20, 31, 0.97);
    -webkit-backdrop-filter: blur(16px);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--s828-line);
    box-shadow: 0 30px 50px -30px rgba(0, 0, 0, 0.95);
    max-height: calc(100vh - 100px);
    overflow-y: auto;
  }

  .s828-header[data-open] .s828-nav {
    display: block;
    animation: s828-drop 0.26s var(--s828-ease) both;
  }

  .s828-nav__list { flex-direction: column; align-items: stretch; gap: 0; }

  .s828-nav__item + .s828-nav__item { border-top: 1px solid rgba(28, 63, 88, 0.6); }

  .s828-nav__link {
    width: 100%;
    min-height: 48px;
    padding: 12px 6px;
    border-radius: 8px;
    font-size: 16px;
    align-items: center;
  }

  .s828-nav__link[aria-current="page"] { padding-left: 12px; }

  .s828-nav__index { font-size: 11px; }

  .s828-grid--2,
  .s828-grid--3,
  .s828-grid--split { grid-template-columns: minmax(0, 1fr); }

  .s828-footer__grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .s828-footer__col--brand { grid-column: 1 / -1; }
}

@keyframes s828-drop {
  from { opacity: 0; transform: translateY(-8px); }
  to { opacity: 1; transform: none; }
}

/* ---------- 小屏 ---------- */
@media (max-width: 620px) {
  body { font-size: 16px; }

  .s828-statusbar { font-size: 10px; letter-spacing: 0.04em; }
  .s828-statusbar__inner { min-height: 36px; gap: 6px 12px; }
  .s828-statusbar__item--hide-sm { display: none; }
  .s828-statusbar__group--end { display: none; }
  .s828-brand__tag { display: none; }
  .s828-brand__name { font-size: 16px; }
  .s828-header__inner { gap: 10px; }
  .s828-header__actions .s828-btn { padding: 0 12px; font-size: 12px; }
  .s828-nav-toggle { padding: 0 10px; }
  .s828-nav-toggle__label { display: none; }

  .s828-footer__grid { grid-template-columns: minmax(0, 1fr); gap: 26px; }
  .s828-footer__bottom { flex-direction: column; align-items: flex-start; gap: 10px; }
  .s828-crumbs__list { font-size: 10px; letter-spacing: 0.08em; }
  .s828-indexlist__link { grid-template-columns: auto minmax(0, 1fr); }
  .s828-indexlist__meta { display: none; }
}

/* ---------- 减少动态效果 ---------- */
@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;
  }

  .s828-progress__bar { transition: none; }

  .s828-js [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .s828-header[data-open] .s828-nav { animation: none; }
}