/* ===== 赌包安装 · 共享外壳样式 /assets/site.css ===== */

/* ---- 1. 设计令牌 ---- */
:root {
  --db-ink-900: #0A1526;
  --db-ink-800: #101F33;
  --db-ink-700: #17293F;
  --db-copper-500: #C8702F;
  --db-copper-300: #E9A063;
  --db-cyan-400: #35D3D1;
  --db-amber-400: #F2B33D;
  --db-wine-600: #6B2C3F;
  --db-teal-700: #0E3A38;
  --db-indigo-700: #2A2A5E;
  --db-paper: #F4F1EA;
  --db-paper-ink: #1B2532;
  --db-text: #E8EEF5;
  --db-text-soft: #C3D1E0;
  --db-muted: #8FA3B8;
  --db-hairline: rgba(232, 238, 245, 0.14);
  --db-hairline-soft: rgba(232, 238, 245, 0.08);
  --db-sans: "Noto Sans SC", "Source Han Sans SC", "Source Han Sans CN", "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", sans-serif;
  --db-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, "Courier New", monospace;
  --db-shadow-1: 0 22px 40px -32px rgba(0, 0, 0, 0.95);
  --db-shadow-2: 0 26px 48px -30px rgba(0, 0, 0, 0.95);
  --db-radius: 3px;
  --db-header-h: 122px;
}

/* ---- 2. Reset ---- */
*,
*::before,
*::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 140px;
}

body {
  margin: 0;
  min-height: 100vh;
  background-color: var(--db-ink-900);
  background-image:
    radial-gradient(circle at 86% -8%, rgba(200, 112, 47, 0.18), transparent 46%),
    radial-gradient(circle at 4% 10%, rgba(53, 211, 209, 0.10), transparent 42%),
    repeating-linear-gradient(0deg, rgba(232, 238, 245, 0.03) 0 1px, transparent 1px 64px),
    repeating-linear-gradient(90deg, rgba(232, 238, 245, 0.03) 0 1px, transparent 1px 64px);
  color: var(--db-text);
  font-family: var(--db-sans);
  font-size: 16px;
  font-weight: 400;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  margin: 0 0 0.5em;
  font-weight: 900;
  letter-spacing: 0.06em;
  line-height: 1.3;
  color: var(--db-text);
}

p { margin: 0 0 1em; }
p:last-child { margin-bottom: 0; }

ul, ol { margin: 0 0 1em; padding-left: 1.4em; }

a { color: var(--db-copper-300); text-decoration: none; }
a:hover { color: var(--db-cyan-400); }

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

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

:focus-visible {
  outline: 2px solid var(--db-cyan-400);
  outline-offset: 3px;
  border-radius: 2px;
}

::selection { background: rgba(200, 112, 47, 0.55); color: #fff; }

/* ---- 3. 基础工具类 ---- */
.db-container {
  width: 100%;
  max-width: 1180px;
  margin-inline: auto;
  padding-inline: 24px;
}

.db-mono {
  font-family: var(--db-mono);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  color: var(--db-muted);
}

.db-rule {
  height: 6px;
  border: 0;
  margin: 0;
  border-radius: 1px;
  background: linear-gradient(90deg, rgba(200, 112, 47, 0.78), rgba(53, 211, 209, 0.45) 46%, rgba(232, 238, 245, 0.05));
}

/* ---- 4. 按钮 ---- */
.db-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5em;
  padding: 0.68em 1.2em;
  border: 1px solid transparent;
  border-radius: var(--db-radius);
  font-size: 0.9375rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  line-height: 1.3;
  text-decoration: none;
  cursor: pointer;
  transition: background-color 0.2s ease-out, color 0.2s ease-out, border-color 0.2s ease-out;
}

.db-btn--primary {
  background: var(--db-copper-500);
  border-color: var(--db-copper-500);
  color: #FFFFFF;
}
.db-btn--primary:hover,
.db-btn--primary:focus-visible {
  background: var(--db-copper-300);
  border-color: var(--db-copper-300);
  color: #2A1505;
}

.db-btn--ghost {
  background: rgba(23, 41, 63, 0.7);
  border-color: rgba(233, 160, 99, 0.5);
  color: var(--db-copper-300);
}
.db-btn--ghost:hover,
.db-btn--ghost:focus-visible {
  background: rgba(200, 112, 47, 0.16);
  border-color: var(--db-copper-300);
  color: #FFD8B4;
}

/* ---- 5. 头部 ---- */
.db-header {
  position: sticky;
  top: 0;
  z-index: 90;
  background: rgba(10, 21, 38, 0.95);
  border-bottom: 1px solid var(--db-hairline);
  box-shadow: 0 18px 34px -30px rgba(0, 0, 0, 0.95);
}

.db-skip {
  position: absolute;
  left: 16px;
  top: -72px;
  z-index: 200;
  padding: 0.62em 1.05em;
  background: var(--db-cyan-400);
  color: #052226;
  font-weight: 700;
  font-size: 0.875rem;
  letter-spacing: 0.05em;
  border-radius: var(--db-radius);
  transition: top 0.18s ease-out;
}
.db-skip:focus {
  top: 12px;
  color: #052226;
}

.db-progress {
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: rgba(232, 238, 245, 0.08);
}
.db-progress__bar {
  display: block;
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--db-copper-500), var(--db-copper-300) 55%, var(--db-cyan-400));
  transition: width 0.12s linear;
}

.db-header__bar {
  display: flex;
  align-items: center;
  gap: 22px;
  padding-block: 15px;
  transition: padding 0.22s ease-out;
}
.db-header[data-scrolled="true"] .db-header__bar { padding-block: 8px; }

.db-brand {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin-right: auto;
  text-decoration: none;
  color: var(--db-text);
  white-space: nowrap;
}
.db-brand:hover { color: var(--db-text); }
.db-brand__name {
  font-size: 1.28rem;
  font-weight: 900;
  letter-spacing: 0.14em;
}
.db-brand__version {
  font-family: var(--db-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.1em;
  color: var(--db-cyan-400);
  padding-left: 9px;
  border-left: 2px solid var(--db-copper-500);
}

.db-nav__list {
  display: flex;
  align-items: center;
  gap: 2px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.db-nav__link {
  display: block;
  padding: 0.42em 0.72em;
  font-size: 0.875rem;
  letter-spacing: 0.06em;
  color: var(--db-muted);
  border-bottom: 2px solid transparent;
  transition: color 0.18s ease-out, border-color 0.18s ease-out;
}
.db-nav__link:hover { color: var(--db-copper-300); }
.db-nav__link[aria-current="page"] {
  color: var(--db-cyan-400);
  border-bottom-color: var(--db-cyan-400);
}

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

/* ---- 6. 快速排障 ---- */
.db-quick { position: relative; }

.db-quick__btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 0.5em 0.85em;
  font-family: var(--db-mono);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  color: var(--db-amber-400);
  background: rgba(242, 179, 61, 0.08);
  border: 1px solid rgba(242, 179, 61, 0.42);
  border-radius: var(--db-radius);
  cursor: pointer;
  white-space: nowrap;
  transition: background-color 0.18s ease-out, border-color 0.18s ease-out, color 0.18s ease-out;
}
.db-quick__btn:hover,
.db-quick__btn[aria-expanded="true"] {
  background: rgba(242, 179, 61, 0.18);
  border-color: var(--db-amber-400);
  color: #FFD98A;
}
.db-quick__icon { font-size: 0.95rem; line-height: 1; }

.db-quick-panel {
  position: absolute;
  right: 0;
  top: calc(100% + 12px);
  z-index: 120;
  width: min(322px, calc(100vw - 32px));
  padding: 16px;
  background: var(--db-ink-700);
  border: 1px solid rgba(232, 238, 245, 0.18);
  border-radius: var(--db-radius);
  box-shadow: 0 30px 52px -26px rgba(0, 0, 0, 0.95), 0 0 0 1px rgba(200, 112, 47, 0.18);
}
.db-quick-panel[hidden] { display: none; }
.db-quick-panel::before {
  content: "";
  position: absolute;
  top: -7px;
  right: 20px;
  width: 12px;
  height: 12px;
  background: var(--db-ink-700);
  border-left: 1px solid rgba(232, 238, 245, 0.18);
  border-top: 1px solid rgba(232, 238, 245, 0.18);
  transform: rotate(45deg);
}
.db-quick-panel__title {
  margin: 0 0 10px;
  font-family: var(--db-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.2em;
  color: var(--db-muted);
}
.db-quick-panel__list {
  display: grid;
  gap: 6px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.db-quick-panel__link {
  display: block;
  padding: 9px 11px;
  font-size: 0.8125rem;
  line-height: 1.5;
  color: var(--db-text);
  background: rgba(10, 21, 38, 0.55);
  border-left: 2px solid var(--db-copper-500);
  transition: background-color 0.18s ease-out, color 0.18s ease-out, border-color 0.18s ease-out;
}
.db-quick-panel__link:hover {
  color: var(--db-cyan-400);
  background: rgba(53, 211, 209, 0.1);
  border-left-color: var(--db-cyan-400);
}
.db-quick-panel__meta {
  margin: 12px 0 0;
  font-family: var(--db-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.06em;
  color: var(--db-muted);
}

/* ---- 7. 移动导航按钮 ---- */
.db-navtoggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  padding: 0;
  background: rgba(23, 41, 63, 0.9);
  border: 1px solid rgba(232, 238, 245, 0.22);
  border-radius: var(--db-radius);
  color: var(--db-text);
  cursor: pointer;
}
.db-navtoggle__bars {
  position: relative;
  display: block;
  width: 18px;
  height: 2px;
  background: var(--db-copper-300);
  transition: background-color 0.18s ease-out;
}
.db-navtoggle__bars::before,
.db-navtoggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 18px;
  height: 2px;
  background: var(--db-copper-300);
  transition: transform 0.2s ease-out;
}
.db-navtoggle__bars::before { top: -6px; }
.db-navtoggle__bars::after { top: 6px; }
.db-navtoggle[aria-expanded="true"] .db-navtoggle__bars { background: transparent; }
.db-navtoggle[aria-expanded="true"] .db-navtoggle__bars::before { transform: translateY(6px) rotate(45deg); }
.db-navtoggle[aria-expanded="true"] .db-navtoggle__bars::after { transform: translateY(-6px) rotate(-45deg); }

/* ---- 8. 悬浮索引条 ---- */
.db-indexbar {
  border-top: 1px solid var(--db-hairline-soft);
  background: linear-gradient(180deg, rgba(23, 41, 63, 0.92), rgba(16, 31, 51, 0.62));
}
.db-indexbar__inner {
  display: flex;
  align-items: center;
  gap: 14px;
  padding-block: 8px;
  overflow-x: auto;
  scrollbar-width: thin;
  transition: padding 0.22s ease-out;
}
.db-indexbar__inner::-webkit-scrollbar { height: 4px; }
.db-indexbar__inner::-webkit-scrollbar-thumb {
  background: rgba(53, 211, 209, 0.42);
  border-radius: 2px;
}
.db-indexbar__label {
  flex: none;
  font-family: var(--db-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.18em;
  color: var(--db-muted);
  padding-left: 9px;
  border-left: 2px solid var(--db-copper-500);
  white-space: nowrap;
}
.db-indexbar__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.db-chip {
  display: inline-block;
  padding: 0.28em 0.72em;
  font-family: var(--db-mono);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  white-space: nowrap;
  color: var(--db-text);
  background: rgba(10, 21, 38, 0.62);
  border: 1px solid rgba(232, 238, 245, 0.16);
  border-radius: 2px;
  transition: color 0.18s ease-out, border-color 0.18s ease-out, background-color 0.18s ease-out;
}
.db-chip:hover {
  color: var(--db-cyan-400);
  border-color: rgba(53, 211, 209, 0.55);
  background: rgba(53, 211, 209, 0.1);
}
.db-chip--accent {
  color: var(--db-amber-400);
  border-color: rgba(242, 179, 61, 0.42);
}
.db-chip--accent:hover {
  color: #FFD98A;
  border-color: var(--db-amber-400);
  background: rgba(242, 179, 61, 0.14);
}
.db-header[data-scrolled="true"] .db-indexbar__inner { padding-block: 5px; }
.db-header[data-scrolled="true"] .db-chip { padding-block: 0.16em; }

/* ---- 9. 页脚 ---- */
.db-footer {
  margin-top: 96px;
  padding-block: 56px 26px;
  background: linear-gradient(180deg, #0B1728, #081120 70%);
  border-top: 1px solid var(--db-hairline);
  font-family: var(--db-mono);
  color: var(--db-text);
}

.db-footer__grid {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr 1.3fr;
  gap: 34px 44px;
  width: 100%;
  max-width: 1320px;
  margin-inline: auto;
  padding-inline: clamp(20px, 5vw, 64px);
}

.db-footer__block { min-width: 0; }

.db-footer__brand {
  margin: 0 0 10px;
  font-family: var(--db-sans);
  font-size: 1.15rem;
  font-weight: 900;
  letter-spacing: 0.16em;
  color: var(--db-text);
}
.db-footer__note {
  margin: 0 0 12px;
  font-family: var(--db-sans);
  font-size: 0.8125rem;
  line-height: 1.7;
  color: var(--db-muted);
  max-width: 30ch;
}
.db-footer__version {
  margin: 0;
  font-size: 0.6875rem;
  letter-spacing: 0.1em;
  color: var(--db-cyan-400);
  padding-left: 9px;
  border-left: 2px solid var(--db-copper-500);
}
.db-footer__block--brand { padding-top: 4px; }

.db-footer__heading {
  margin: 0 0 14px;
  padding-top: 12px;
  border-top: 2px solid var(--db-copper-500);
  font-family: var(--db-sans);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.22em;
  color: var(--db-copper-300);
}
.db-footer__list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 2px;
}
.db-footer__list--contact { gap: 8px; margin-bottom: 14px; }

.db-footer__link {
  display: inline-block;
  padding-block: 2px;
  font-size: 0.8125rem;
  letter-spacing: 0.04em;
  color: var(--db-text);
  border-bottom: 1px solid transparent;
  transition: color 0.18s ease-out, border-color 0.18s ease-out;
}
.db-footer__link:hover {
  color: var(--db-cyan-400);
  border-bottom-color: rgba(53, 211, 209, 0.5);
}

.db-footer__line {
  display: flex;
  align-items: baseline;
  gap: 10px;
  font-size: 0.8125rem;
  line-height: 1.6;
}
.db-footer__key {
  flex: none;
  min-width: 40px;
  font-size: 0.6875rem;
  letter-spacing: 0.16em;
  color: var(--db-muted);
}
.db-footer__value { color: var(--db-text-soft); word-break: break-word; }

.db-footer__cta { margin-top: 14px; }

.db-footer__bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 28px;
  margin-top: 44px;
  padding: 20px clamp(20px, 5vw, 64px) 0;
  border-top: 1px solid var(--db-hairline-soft);
}
.db-footer__legal {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.db-footer__legal .db-footer__link { font-size: 0.75rem; }
.db-footer__meta {
  margin: 0;
  font-size: 0.6875rem;
  letter-spacing: 0.08em;
  color: var(--db-muted);
}

/* ---- 10. 页面通用组件 ---- */
.db-breadcrumb { margin-block: 24px 0; }
.db-breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--db-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.08em;
  color: var(--db-muted);
}
.db-breadcrumb__item::after {
  content: "/";
  margin-left: 6px;
  color: rgba(143, 163, 184, 0.5);
}
.db-breadcrumb__item:last-child::after { content: none; }
.db-breadcrumb__link { color: var(--db-muted); }
.db-breadcrumb__link:hover { color: var(--db-cyan-400); }

.db-section { margin-block: clamp(56px, 7vw, 72px); }
.db-section:first-child { margin-top: 0; }
.db-section__head {
  display: grid;
  gap: 10px;
  margin-bottom: 24px;
}
.db-kicker {
  font-family: var(--db-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.2em;
  color: var(--db-copper-300);
  padding-left: 10px;
  border-left: 2px solid var(--db-copper-500);
}
.db-section__title {
  margin: 0;
  font-size: clamp(1.375rem, 2.4vw, 1.75rem);
  letter-spacing: 0.06em;
}
.db-section__lede {
  margin: 0;
  max-width: 62ch;
  font-size: 0.9375rem;
  color: var(--db-text-soft);
}

.db-grid { display: grid; gap: 24px; }
.db-grid--7-4 { grid-template-columns: 7fr 4fr; }
.db-grid--8-3 { grid-template-columns: 8fr 3fr; }

.db-panel {
  padding: 24px;
  background: var(--db-ink-800);
  border: 1px solid var(--db-hairline);
  border-radius: var(--db-radius);
  box-shadow: inset 0 1px 0 rgba(244, 241, 234, 0.06), var(--db-shadow-1);
}
.db-panel--stack {
  background: var(--db-ink-700);
  box-shadow: inset 0 1px 0 rgba(244, 241, 234, 0.08), var(--db-shadow-2), 0 0 0 1px rgba(200, 112, 47, 0.16);
}

.db-tag {
  display: inline-block;
  padding: 0.2em 0.6em;
  font-family: var(--db-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.1em;
  color: var(--db-cyan-400);
  border: 1px solid rgba(53, 211, 209, 0.45);
  border-radius: 2px;
}
.db-tag--warn {
  color: var(--db-amber-400);
  border-color: rgba(242, 179, 61, 0.5);
}

/* 图片占位容器 */
.db-media {
  position: relative;
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--db-hairline);
  border-radius: var(--db-radius);
  background: var(--db-ink-800);
}
.db-media__frame {
  display: block;
  width: 100%;
  aspect-ratio: 16 / 10;
  background-color: #0C1A2C;
  background-image:
    repeating-linear-gradient(0deg, rgba(53, 211, 209, 0.10) 0 1px, transparent 1px 26px),
    repeating-linear-gradient(90deg, rgba(53, 211, 209, 0.10) 0 1px, transparent 1px 26px),
    linear-gradient(135deg, rgba(200, 112, 47, 0.20), transparent 58%);
}
.db-media__frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.db-media__caption {
  padding: 9px 12px;
  border-top: 1px solid var(--db-hairline-soft);
  font-family: var(--db-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.06em;
  color: var(--db-muted);
}
.db-media--wide .db-media__frame { aspect-ratio: 21 / 9; }
.db-media--tall .db-media__frame { aspect-ratio: 4 / 5; }

/* 页签 */
.db-tabs__list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 0 0 18px;
  padding: 0;
  list-style: none;
  border-bottom: 1px solid var(--db-hairline);
}
.db-tabs__tab {
  padding: 0.5em 0.95em;
  font-family: var(--db-mono);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  color: var(--db-muted);
  background: transparent;
  border: 1px solid transparent;
  border-bottom: 2px solid transparent;
  border-radius: 2px 2px 0 0;
  cursor: pointer;
  transition: color 0.18s ease-out, border-color 0.18s ease-out, background-color 0.18s ease-out;
}
.db-tabs__tab:hover { color: var(--db-copper-300); }
.db-tabs__tab[aria-selected="true"] {
  color: var(--db-cyan-400);
  border-bottom-color: var(--db-cyan-400);
  background: rgba(53, 211, 209, 0.1);
}
.db-tabs__panel {
  padding: 18px;
  background: var(--db-ink-800);
  border: 1px solid var(--db-hairline);
  border-radius: var(--db-radius);
  color: var(--db-text-soft);
  font-size: 0.9375rem;
}
.db-tabs__panel[hidden] { display: none; }

/* 折叠面板 */
.db-fold {
  margin: 0 0 10px;
  background: var(--db-ink-800);
  border: 1px solid var(--db-hairline);
  border-radius: var(--db-radius);
}
.db-fold__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
  padding: 13px 16px;
  font-weight: 700;
  letter-spacing: 0.03em;
  color: var(--db-text);
  cursor: pointer;
  list-style: none;
}
.db-fold__head::-webkit-details-marker { display: none; }
.db-fold__head::after {
  content: "+";
  font-family: var(--db-mono);
  color: var(--db-copper-300);
}
.db-fold[open] .db-fold__head { color: var(--db-cyan-400); }
.db-fold[open] .db-fold__head::after { content: "−"; }
.db-fold__body {
  padding: 0 16px 16px;
  font-size: 0.9375rem;
  color: var(--db-text-soft);
  border-top: 1px solid var(--db-hairline-soft);
  margin-top: 2px;
  padding-top: 12px;
}

/* 竖向锚点栏 */
.db-anchor-nav { position: sticky; top: calc(var(--db-header-h) + 16px); }
.db-anchor-nav__list {
  margin: 0;
  padding: 0;
  list-style: none;
  border-left: 2px solid var(--db-hairline);
}
.db-anchor-nav__link {
  display: block;
  margin-left: -2px;
  padding: 6px 0 6px 14px;
  font-family: var(--db-mono);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  color: var(--db-muted);
  border-left: 2px solid transparent;
  transition: color 0.18s ease-out, border-color 0.18s ease-out;
}
.db-anchor-nav__link:hover { color: var(--db-copper-300); }
.db-anchor-nav__link[aria-current="true"] {
  color: var(--db-cyan-400);
  border-left-color: var(--db-cyan-400);
}

/* 显现 */
.db-reveal { transition: opacity 0.22s ease-out, transform 0.22s ease-out; }
.db-js .db-reveal {
  opacity: 0;
  transform: translateY(12px);
}
.db-js .db-reveal[data-visible="true"] {
  opacity: 1;
  transform: none;
}

/* ---- 11. 响应式 ---- */
@media (max-width: 1024px) {
  .db-footer__grid { grid-template-columns: 1fr 1fr; }
  .db-footer__block:last-child { grid-column: 1 / -1; }
}

@media (max-width: 900px) {
  :root { --db-header-h: 108px; }

  .db-nav {
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    display: none;
    padding: 6px 0 16px;
    background: var(--db-ink-800);
    border-bottom: 1px solid var(--db-hairline);
    box-shadow: 0 30px 48px -26px rgba(0, 0, 0, 0.95);
  }
  .db-nav[data-open="true"] { display: block; }
  .db-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding-inline: 20px;
  }
  .db-nav__link {
    padding: 0.85em 0.2em;
    font-size: 1rem;
    border-bottom: 1px solid var(--db-hairline-soft);
    border-radius: 0;
  }
  .db-nav__link[aria-current="page"] {
    border-bottom-color: rgba(53, 211, 209, 0.5);
    background: linear-gradient(90deg, rgba(53, 211, 209, 0.14), transparent);
  }

  .db-navtoggle { display: inline-flex; }
  .db-quick__label { display: none; }

  .db-grid--7-4,
  .db-grid--8-3 { grid-template-columns: 1fr; }

  .db-anchor-nav {
    position: static;
    margin-bottom: 20px;
  }
}

@media (max-width: 720px) {
  .db-container { padding-inline: 18px; }
  .db-header__bar { gap: 12px; padding-block: 12px; }
  .db-brand__name { font-size: 1.08rem; letter-spacing: 0.1em; }
  .db-brand__version { display: none; }
  .db-indexbar__label { display: none; }

  .db-footer { margin-top: 64px; padding-block: 40px 22px; }
  .db-footer__grid {
    grid-template-columns: 1fr;
    gap: 28px;
  }
  .db-footer__block:last-child { grid-column: auto; }
  .db-footer__bottom {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
    margin-top: 32px;
  }
  .db-panel { padding: 18px; }
}

@media (max-width: 420px) {
  .db-quick__btn { padding: 0.45em 0.6em; }
  .db-chip { font-size: 0.6875rem; }
}

/* ---- 12. 动效降级 ---- */
@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;
  }
  .db-js .db-reveal {
    opacity: 1;
    transform: none;
  }
}