/* ============================================================
   乐宝体育 · 共享 Site Kit
   /assets/site.css
   ============================================================ */

/* ---------- 1. Reset ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--lb-nav-h) + 18px);
}

body,
h1, h2, h3, h4, h5, h6,
p, ul, ol, li, figure, blockquote, dl, dd, fieldset {
  margin: 0;
}

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

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

img { height: auto; border: 0; }

a { color: inherit; }

button { font: inherit; color: inherit; }

:focus-visible {
  outline: 2px solid var(--lb-accent);
  outline-offset: 3px;
  border-radius: 6px;
}

/* ---------- 2. 变量 ---------- */
:root {
  /* 色彩 */
  --lb-bg: #0B1F1A;
  --lb-panel: #12302A;
  --lb-panel-deep: #0A1B17;
  --lb-line: #1E4A3F;
  --lb-accent: #3DFFC1;
  --lb-accent-dim: #1FAF86;
  --lb-orange: #FF7A1A;
  --lb-warm: #F4F1E8;
  --lb-white: #FFFFFF;
  --lb-muted: #B9C6C0;
  --lb-mist: #7DF9D4;
  --lb-alert: #FF4D3D;

  /* 字体 */
  --lb-font-display: 'Barlow Condensed', 'Oswald', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --lb-font-body: 'Inter', 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
  --lb-font-mono: 'JetBrains Mono', 'IBM Plex Mono', 'SFMono-Regular', Consolas, monospace;

  /* 尺寸 */
  --lb-maxw: 1280px;
  --lb-gutter: clamp(16px, 4vw, 40px);
  --lb-radius-l: 28px;
  --lb-radius-m: 18px;
  --lb-radius-s: 12px;
  --lb-pill: 999px;

  --lb-mast-h: 68px;
  --lb-nav-h: 58px;
}

@media (max-width: 899px) {
  :root {
    --lb-mast-h: 56px;
    --lb-nav-h: 54px;
    --lb-radius-l: 22px;
    --lb-radius-m: 16px;
  }
}

/* ---------- 3. 基础中文排版 ---------- */
body {
  min-height: 100%;
  background-color: var(--lb-bg);
  background-image:
    radial-gradient(1080px 620px at 84% -10%, rgba(61, 255, 193, 0.15), transparent 64%),
    radial-gradient(760px 520px at 4% 2%, rgba(255, 122, 26, 0.10), transparent 62%),
    linear-gradient(180deg, #0B1F1A 0%, #0B1F1A 100%);
  background-repeat: no-repeat;
  color: var(--lb-warm);
  font-family: var(--lb-font-body);
  font-size: 16px;
  line-height: 1.75;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

/* 暗场网格纹理（固定层，不遮挡交互） */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(61, 255, 193, 0.055) 1px, transparent 1px),
    linear-gradient(90deg, rgba(61, 255, 193, 0.055) 1px, transparent 1px);
  background-size: 64px 64px;
  -webkit-mask-image: radial-gradient(ellipse 92% 68% at 50% 0%, #000 18%, transparent 78%);
  mask-image: radial-gradient(ellipse 92% 68% at 50% 0%, #000 18%, transparent 78%);
}

#main-content {
  position: relative;
  z-index: 1;
  display: block;
}

h1, h2, h3, h4 {
  font-family: var(--lb-font-display);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: 0.02em;
  color: var(--lb-white);
}

p { color: var(--lb-warm); }

strong { color: var(--lb-white); font-weight: 650; }

::selection {
  background: var(--lb-accent);
  color: #05201A;
}

/* ---------- 4. 容器 ---------- */
.lb-shell {
  width: 100%;
  max-width: var(--lb-maxw);
  margin-inline: auto;
  padding-inline: var(--lb-gutter);
}

/* ---------- 5. Skip link ---------- */
.lb-skip {
  position: fixed;
  top: 0;
  left: 50%;
  z-index: 300;
  transform: translate(-50%, -160%);
  padding: 12px 22px;
  border-radius: 0 0 14px 14px;
  background: var(--lb-accent);
  color: #05201A;
  font-family: var(--lb-font-body);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-decoration: none;
  transition: transform 180ms ease;
}

.lb-skip:focus,
.lb-skip:focus-visible {
  transform: translate(-50%, 0);
  outline-offset: -2px;
}

/* ---------- 6. 头部：负偏移粘性壳 ---------- */
.lb-header {
  position: sticky;
  top: calc(-1 * var(--lb-mast-h));
  z-index: 100;
  isolation: isolate;
}

/* --- 6.1 记分牌抬头 --- */
.lb-masthead {
  position: relative;
  z-index: 2;
  background: linear-gradient(180deg, #0C221D 0%, #0A1B17 100%);
}

.lb-masthead::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: linear-gradient(
    90deg,
    transparent 0%,
    rgba(61, 255, 193, 0.55) 24%,
    rgba(255, 122, 26, 0.42) 62%,
    transparent 100%
  );
}

.lb-masthead__inner {
  display: flex;
  align-items: center;
  gap: 20px;
  min-height: var(--lb-mast-h);
}

.lb-masthead__act {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 10px;
}

/* --- 6.2 品牌 --- */
.lb-brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--lb-warm);
  flex: none;
}

.lb-brand__glyph {
  position: relative;
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  border-radius: 11px;
  background: linear-gradient(150deg, var(--lb-accent) 0%, var(--lb-accent-dim) 100%);
  box-shadow: 0 8px 22px -12px rgba(61, 255, 193, 0.95);
  flex: none;
}

.lb-brand__glyph::before {
  content: "";
  width: 12px;
  height: 12px;
  border-radius: 3px;
  background: #062019;
  transform: rotate(45deg);
}

.lb-brand__lockup {
  display: flex;
  flex-direction: column;
  gap: 3px;
  min-width: 0;
}

.lb-brand__name {
  font-family: var(--lb-font-display);
  font-size: 20px;
  font-weight: 800;
  line-height: 1;
  letter-spacing: 0.08em;
  color: var(--lb-white);
}

.lb-brand__sub {
  font-family: var(--lb-font-mono);
  font-size: 11px;
  font-weight: 600;
  line-height: 1.3;
  letter-spacing: 0.08em;
  color: var(--lb-muted);
  white-space: nowrap;
}

.lb-brand--footer { margin-bottom: 18px; }

/* --- 6.3 按钮 --- */
.lb-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 42px;
  padding: 0 20px;
  border: 0;
  border-radius: var(--lb-pill);
  font-family: var(--lb-font-body);
  font-size: 13px;
  font-weight: 650;
  line-height: 1;
  letter-spacing: 0.03em;
  text-decoration: none;
  white-space: nowrap;
  cursor: pointer;
  transition:
    background-color 180ms ease,
    color 180ms ease,
    box-shadow 180ms ease,
    transform 180ms ease;
}

.lb-btn--solid {
  background: var(--lb-accent);
  color: #05201A;
  box-shadow:
    inset 0 0 0 1px rgba(61, 255, 193, 0.5),
    0 12px 30px -14px rgba(61, 255, 193, 0.9);
}

.lb-btn--solid:hover {
  background: var(--lb-mist);
  transform: translateY(-1px);
}

.lb-btn--quiet {
  background: rgba(18, 48, 42, 0.6);
  color: var(--lb-warm);
  box-shadow: inset 0 0 0 1px var(--lb-line);
}

.lb-btn--quiet:hover {
  color: var(--lb-accent);
  box-shadow: inset 0 0 0 1px rgba(61, 255, 193, 0.55);
}

/* --- 6.4 吸顶导航带 --- */
.lb-navbar {
  position: relative;
  z-index: 1;
  background: rgba(9, 26, 22, 0.94);
  border-bottom: 1px solid var(--lb-line);
  -webkit-backdrop-filter: blur(14px) saturate(120%);
  backdrop-filter: blur(14px) saturate(120%);
}

.lb-navbar__inner {
  display: flex;
  align-items: center;
  gap: 14px;
  min-height: var(--lb-nav-h);
}

.lb-navbar__tag {
  margin-left: auto;
  font-family: var(--lb-font-mono);
  font-size: 11px;
  font-weight: 600;
  line-height: 1;
  letter-spacing: 0.14em;
  color: var(--lb-accent-dim);
  white-space: nowrap;
}

/* --- 6.5 导航列表 --- */
.lb-nav { flex: 1 1 auto; min-width: 0; }

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

.lb-nav__item { display: block; }

.lb-nav__link {
  position: relative;
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  padding: 10px 13px;
  border-radius: var(--lb-pill);
  color: var(--lb-muted);
  font-family: var(--lb-font-body);
  font-size: 14px;
  font-weight: 500;
  line-height: 1;
  letter-spacing: 0.01em;
  text-decoration: none;
  white-space: nowrap;
  transition: color 160ms ease, background-color 160ms ease;
}

.lb-nav__idx {
  font-family: var(--lb-font-mono);
  font-size: 10px;
  font-weight: 600;
  line-height: 1;
  letter-spacing: 0.1em;
  color: var(--lb-accent-dim);
  transition: color 160ms ease;
}

.lb-nav__link:hover {
  color: var(--lb-white);
  background: rgba(30, 74, 63, 0.55);
}

.lb-nav__link:hover .lb-nav__idx { color: var(--lb-accent); }

.lb-nav__link[aria-current="page"] {
  color: var(--lb-white);
  background: rgba(61, 255, 193, 0.13);
}

.lb-nav__link[aria-current="page"] .lb-nav__idx { color: var(--lb-accent); }

.lb-nav__link[aria-current="page"]::after {
  content: "";
  position: absolute;
  left: 13px;
  right: 13px;
  bottom: 5px;
  height: 2px;
  border-radius: 2px;
  background: var(--lb-accent);
  box-shadow: 0 0 10px rgba(61, 255, 193, 0.85);
}

/* --- 6.6 汉堡按钮 --- */
.lb-burger {
  display: none;
  align-items: center;
  gap: 9px;
  margin-left: auto;
  padding: 9px 16px;
  border: 1px solid var(--lb-line);
  border-radius: var(--lb-pill);
  background: rgba(18, 48, 42, 0.85);
  color: var(--lb-warm);
  font-family: var(--lb-font-body);
  font-size: 13px;
  font-weight: 600;
  line-height: 1;
  letter-spacing: 0.04em;
  cursor: pointer;
  transition: color 160ms ease, border-color 160ms ease;
}

.lb-burger:hover { color: var(--lb-accent); border-color: rgba(61, 255, 193, 0.5); }

.lb-burger__bar {
  position: relative;
  display: block;
  width: 16px;
  height: 2px;
  border-radius: 2px;
  background: currentColor;
  transition: background-color 180ms ease;
}

.lb-burger__bar::before,
.lb-burger__bar::after {
  content: "";
  position: absolute;
  left: 0;
  width: 16px;
  height: 2px;
  border-radius: 2px;
  background: currentColor;
  transition: transform 200ms ease, top 200ms ease, bottom 200ms ease;
}

.lb-burger__bar::before { top: -5px; }
.lb-burger__bar::after { bottom: -5px; }

.lb-burger[aria-expanded="true"] .lb-burger__bar { background: transparent; }
.lb-burger[aria-expanded="true"] .lb-burger__bar::before { top: 0; transform: rotate(45deg); }
.lb-burger[aria-expanded="true"] .lb-burger__bar::after { bottom: 0; transform: rotate(-45deg); }

/* --- 6.7 滚动进度条 --- */
.lb-meter {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  overflow: hidden;
  pointer-events: none;
}

.lb-meter__fill {
  display: block;
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, var(--lb-accent-dim) 0%, var(--lb-accent) 100%);
  box-shadow: 0 0 12px rgba(61, 255, 193, 0.7);
  transition: width 120ms linear;
}

/* ---------- 7. 页脚 ---------- */
.lb-footer {
  position: relative;
  z-index: 1;
  overflow: hidden;
  margin-top: clamp(64px, 9vw, 120px);
  padding: clamp(44px, 6vw, 76px) 0 clamp(20px, 3vw, 32px);
  background: linear-gradient(180deg, #0A1B17 0%, #12302A 100%);
}

.lb-footer::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  height: 1px;
  background: linear-gradient(
    90deg,
    transparent 0%,
    rgba(61, 255, 193, 0.6) 30%,
    rgba(255, 122, 26, 0.45) 68%,
    transparent 100%
  );
}

.lb-footer::after {
  content: "";
  position: absolute;
  right: -140px;
  bottom: -180px;
  width: 480px;
  height: 480px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(61, 255, 193, 0.11) 0%, transparent 68%);
  pointer-events: none;
}

.lb-footer__top {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(250px, 1fr) minmax(0, 1.7fr);
  gap: clamp(32px, 5vw, 72px);
  padding-bottom: clamp(32px, 4vw, 56px);
}

.lb-footer__brand { min-width: 0; }

.lb-footer__blurb {
  max-width: 34ch;
  margin-bottom: 22px;
  color: var(--lb-muted);
  font-size: 14px;
  line-height: 1.8;
}

.lb-footer__cols {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr)) minmax(0, 1.35fr);
  gap: clamp(22px, 3vw, 40px);
}

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

.lb-footer__coltitle {
  margin-bottom: 16px;
  font-family: var(--lb-font-mono);
  font-size: 11px;
  font-weight: 600;
  line-height: 1.4;
  letter-spacing: 0.14em;
  color: var(--lb-accent);
}

.lb-footer__list > li + li { margin-top: 11px; }

.lb-footer__link {
  position: relative;
  display: inline-block;
  color: var(--lb-muted);
  font-size: 14px;
  line-height: 1.6;
  text-decoration: none;
  transition: color 160ms ease;
}

.lb-footer__link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -2px;
  width: 0;
  height: 1px;
  background: var(--lb-accent);
  transition: width 200ms ease;
}

.lb-footer__link:hover { color: var(--lb-white); }
.lb-footer__link:hover::after { width: 100%; }

.lb-footer__contact-item {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin-top: 0;
}

.lb-footer__list > .lb-footer__contact-item + .lb-footer__contact-item { margin-top: 14px; }

.lb-footer__label {
  font-family: var(--lb-font-mono);
  font-size: 10px;
  font-weight: 600;
  line-height: 1.4;
  letter-spacing: 0.12em;
  color: var(--lb-accent-dim);
}

.lb-footer__value {
  color: var(--lb-warm);
  font-size: 14px;
  line-height: 1.65;
  word-break: break-word;
}

.lb-footer__value--mono {
  font-family: var(--lb-font-mono);
  font-size: 13px;
  letter-spacing: 0.03em;
  color: var(--lb-white);
}

.lb-footer__note {
  margin-top: 16px;
  padding-top: 14px;
  border-top: 1px solid rgba(30, 74, 63, 0.75);
  color: var(--lb-muted);
  font-size: 12px;
  line-height: 1.7;
}

.lb-footer__legal {
  position: relative;
  z-index: 1;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 26px;
  padding-top: 20px;
  border-top: 1px solid var(--lb-line);
  font-family: var(--lb-font-mono);
  font-size: 12px;
  font-weight: 500;
  line-height: 1.6;
  letter-spacing: 0.05em;
  color: var(--lb-muted);
}

.lb-footer__copy { color: var(--lb-muted); }

.lb-footer__filing {
  display: inline-flex;
  align-items: center;
  padding: 4px 12px;
  border-radius: var(--lb-pill);
  background: rgba(61, 255, 193, 0.09);
  box-shadow: inset 0 0 0 1px rgba(61, 255, 193, 0.2);
  color: var(--lb-accent-dim);
  font-size: 11px;
}

/* ---------- 8. 通用页面组件 ---------- */
.lb-panel {
  position: relative;
  background: var(--lb-panel);
  border: 1px solid rgba(30, 74, 63, 0.85);
  border-radius: var(--lb-radius-l);
  padding: clamp(20px, 3vw, 36px);
}

.lb-panel--soft {
  background: rgba(18, 48, 42, 0.55);
  -webkit-backdrop-filter: blur(6px);
  backdrop-filter: blur(6px);
}

.lb-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 12px;
  border-radius: var(--lb-pill);
  background: rgba(61, 255, 193, 0.12);
  box-shadow: inset 0 0 0 1px rgba(61, 255, 193, 0.22);
  color: var(--lb-accent);
  font-family: var(--lb-font-mono);
  font-size: 11px;
  font-weight: 600;
  line-height: 1.4;
  letter-spacing: 0.08em;
  white-space: nowrap;
}

.lb-pill--orange {
  background: rgba(255, 122, 26, 0.14);
  box-shadow: inset 0 0 0 1px rgba(255, 122, 26, 0.28);
  color: var(--lb-orange);
}

.lb-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--lb-font-mono);
  font-size: 11px;
  font-weight: 600;
  line-height: 1.4;
  letter-spacing: 0.16em;
  color: var(--lb-accent-dim);
}

.lb-eyebrow::before {
  content: "";
  width: 22px;
  height: 2px;
  border-radius: 2px;
  background: var(--lb-accent);
  box-shadow: 0 0 10px rgba(61, 255, 193, 0.7);
  flex: none;
}

.lb-prose {
  max-width: 68ch;
  color: var(--lb-warm);
  font-size: 16px;
  line-height: 1.78;
}

.lb-prose p + p { margin-top: 1em; }
.lb-prose h2,
.lb-prose h3 { margin-top: 1.6em; margin-bottom: 0.55em; }

.lb-prose a {
  color: var(--lb-accent);
  text-decoration: underline;
  text-decoration-color: rgba(61, 255, 193, 0.45);
  text-underline-offset: 3px;
}

.lb-prose ul,
.lb-prose ol {
  margin-top: 0.8em;
  padding-left: 1.2em;
}

.lb-prose ul { list-style: square; }
.lb-prose ol { list-style: decimal; }
.lb-prose li + li { margin-top: 0.4em; }
.lb-prose li::marker { color: var(--lb-accent-dim); }

.lb-crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding-top: 22px;
  font-family: var(--lb-font-mono);
  font-size: 11px;
  font-weight: 600;
  line-height: 1.5;
  letter-spacing: 0.08em;
  color: var(--lb-muted);
}

.lb-crumbs__link {
  color: var(--lb-accent-dim);
  text-decoration: none;
  transition: color 160ms ease;
}

.lb-crumbs__link:hover { color: var(--lb-accent); }

.lb-crumbs__sep {
  display: inline-block;
  width: 12px;
  height: 1px;
  background: var(--lb-line);
}

.lb-crumbs__current { color: var(--lb-warm); }

.lb-grid {
  display: grid;
  gap: clamp(16px, 2.4vw, 28px);
}

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

.lb-divider {
  width: 100%;
  height: 1px;
  border: 0;
  background: var(--lb-line);
}

/* ---------- 9. 图片容器基础规则 ---------- */
.lb-media {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 10;
  border-radius: var(--lb-radius-l);
  border: 1px solid rgba(30, 74, 63, 0.85);
  background:
    radial-gradient(120% 90% at 20% 0%, rgba(61, 255, 193, 0.16), transparent 62%),
    linear-gradient(145deg, #143A32 0%, #0C221D 58%, #12302A 100%);
}

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

.lb-media > img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.lb-media::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(180deg, rgba(11, 31, 26, 0) 42%, rgba(11, 31, 26, 0.6) 100%);
}

.lb-media__cap {
  position: absolute;
  left: 14px;
  bottom: 13px;
  z-index: 2;
  padding: 5px 12px;
  border-radius: var(--lb-pill);
  background: rgba(6, 26, 21, 0.78);
  color: var(--lb-mist);
  font-family: var(--lb-font-mono);
  font-size: 11px;
  font-weight: 600;
  line-height: 1.4;
  letter-spacing: 0.07em;
  -webkit-backdrop-filter: blur(6px);
  backdrop-filter: blur(6px);
}

/* ---------- 10. 动效 ---------- */
.lb-reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 420ms ease, transform 420ms ease;
  will-change: opacity, transform;
}

.lb-reveal.is-in {
  opacity: 1;
  transform: none;
}

.lb-top {
  position: fixed;
  right: clamp(14px, 3vw, 28px);
  bottom: clamp(14px, 3vw, 28px);
  z-index: 90;
  display: grid;
  place-items: center;
  width: 46px;
  height: 46px;
  border: 1px solid rgba(61, 255, 193, 0.45);
  border-radius: 50%;
  background: rgba(10, 27, 23, 0.9);
  color: var(--lb-accent);
  font-size: 17px;
  line-height: 1;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: opacity 200ms ease, transform 200ms ease, visibility 200ms ease, background-color 200ms ease;
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
}

.lb-top.is-on {
  opacity: 1;
  visibility: visible;
  transform: none;
}

.lb-top:hover { background: rgba(18, 48, 42, 0.95); }

/* ---------- 11. 工具类 ---------- */
.lb-visually-hidden {
  position: absolute !important;
  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;
}

/* ---------- 12. 响应式 ---------- */
@media (max-width: 1199px) {
  .lb-nav__link { padding: 10px 10px; font-size: 13.5px; }
  .lb-nav__idx { display: none; }
}

@media (max-width: 1023px) {
  .lb-footer__top { grid-template-columns: 1fr; }
  .lb-footer__cols { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .lb-footer__col--wide { grid-column: 1 / -1; }
  .lb-footer__blurb { max-width: 52ch; }
  .lb-grid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 899px) {
  .lb-masthead__act .lb-btn--quiet { display: none; }
  .lb-burger { display: inline-flex; }
  .lb-navbar__tag { display: none; }

  .lb-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    display: none;
    flex: none;
    max-height: calc(100vh - var(--lb-nav-h) - 16px);
    overflow-y: auto;
    padding: 12px var(--lb-gutter) 20px;
    background: #0A1B17;
    border-bottom: 1px solid var(--lb-line);
    box-shadow: 0 34px 60px -34px rgba(0, 0, 0, 0.95);
  }

  .lb-nav[data-open] { display: block; }

  .lb-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 3px;
  }

  .lb-nav__link {
    display: flex;
    justify-content: flex-start;
    padding: 14px 16px;
    border-radius: 14px;
    font-size: 15.5px;
    background: rgba(18, 48, 42, 0.5);
  }

  .lb-nav__idx { display: inline-block; font-size: 11px; }

  .lb-nav__link[aria-current="page"]::after {
    left: auto;
    right: 16px;
    bottom: 50%;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    transform: translateY(50%);
  }

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

@media (max-width: 599px) {
  .lb-brand__sub { display: none; }
  .lb-brand__glyph { width: 32px; height: 32px; border-radius: 10px; }
  .lb-brand__name { font-size: 18px; }
  .lb-masthead__inner { gap: 12px; }
  .lb-masthead__act { gap: 8px; }
  .lb-btn { min-height: 40px; padding: 0 16px; font-size: 12.5px; }
  .lb-footer__cols { grid-template-columns: 1fr; }
  .lb-footer__col--wide { grid-column: auto; }
  .lb-footer__legal { font-size: 11px; letter-spacing: 0.03em; }
}

/* ---------- 13. 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;
    scroll-behavior: auto !important;
  }

  .lb-reveal {
    opacity: 1;
    transform: none;
  }

  .lb-btn--solid:hover,
  .lb-top.is-on { transform: none; }
}