/* ============================================================
   LOVEBET赛场 — /assets/site.css
   共享外壳：reset / 变量 / 排版 / 头部 / 页脚 / 通用组件
   ============================================================ */

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

html {
  -webkit-text-size-adjust: 100%;
  background: #0B1F1A;
  scroll-behavior: smooth;
}

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

ul, ol { list-style: none; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }
a { color: inherit; text-decoration: none; }
img, svg, video { display: block; max-width: 100%; }
img { height: auto; }

/* ---------- 2. 变量 ---------- */
:root {
  --lb-ink: #0B1F1A;
  --lb-ink-deep: #06120F;
  --lb-orange: #FF6B1A;
  --lb-cyan: #2FE6D0;
  --lb-warm: #F6F3EC;
  --lb-mist: #9BB3AA;
  --lb-wine: #6E1F35;
  --lb-indigo: #2B2A5E;
  --lb-orange-soft: #FFA870;
  --lb-cyan-soft: #8FF3E6;
  --lb-line: #1E3A33;

  --lb-font-display: "Noto Sans SC", "Source Han Sans SC", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  --lb-font-mono: ui-monospace, "JetBrains Mono", "IBM Plex Mono", "SFMono-Regular",
    Menlo, Consolas, "Liberation Mono", monospace;

  --lb-shell: 1360px;
  --lb-gutter: clamp(16px, 4vw, 56px);
  --lb-radius: 2px;
  --lb-ease: cubic-bezier(0.2, 0.8, 0.2, 1);
  --lb-shadow: 0 18px 40px -28px rgba(0, 0, 0, 0.78);
  --lb-hd: 128px;
}

/* ---------- 3. 基础排版 ---------- */
body {
  font-family: var(--lb-font-display);
  font-size: 1rem;
  line-height: 1.75;
  color: var(--lb-warm);
  background-color: var(--lb-ink);
  background-image:
    linear-gradient(168deg, rgba(6, 18, 15, 0.92) 0%, rgba(11, 31, 26, 0) 46%),
    repeating-linear-gradient(90deg, rgba(30, 58, 51, 0.34) 0 1px, transparent 1px 96px);
  background-attachment: fixed, scroll;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  min-height: 100vh;
  overflow-x: hidden;
}

#main-content {
  display: block;
  scroll-margin-top: calc(var(--lb-hd) + 20px);
}

.lb-display {
  font-family: var(--lb-font-display);
  font-weight: 900;
  font-size: clamp(2.5rem, 6.5vw, 5.5rem);
  line-height: 0.98;
  letter-spacing: -0.02em;
}

.lb-num {
  font-family: var(--lb-font-mono);
  font-variant-numeric: tabular-nums lining-nums;
  font-weight: 500;
  letter-spacing: -0.02em;
  line-height: 1;
}

.lb-eyebrow {
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--lb-mist);
}

.lb-vnote {
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.18em;
  color: var(--lb-mist);
  writing-mode: vertical-rl;
  text-orientation: mixed;
}

.lb-lead {
  font-size: clamp(1.0625rem, 1.4vw, 1.25rem);
  line-height: 1.7;
  color: var(--lb-warm);
  max-width: 44ch;
}

.lb-text {
  font-size: 1rem;
  line-height: 1.85;
  color: var(--lb-mist);
  max-width: 62ch;
}

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

.lb-shell--narrow { max-width: 980px; }

.lb-split {
  display: grid;
  grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  gap: clamp(20px, 4vw, 64px);
  align-items: start;
}

.lb-split--flip { grid-template-columns: minmax(0, 7fr) minmax(0, 5fr); }

.lb-section { padding-block: clamp(48px, 8vw, 108px); }

.lb-section__head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 18px 28px;
  padding-bottom: 22px;
  border-bottom: 1px solid var(--lb-line);
}

.lb-section__title {
  font-size: clamp(1.5rem, 2.6vw, 2rem);
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: -0.01em;
}

.lb-section__note {
  font-size: 0.875rem;
  line-height: 1.75;
  color: var(--lb-mist);
  max-width: 46ch;
}

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

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

.lb-slash {
  position: relative;
  padding-block: clamp(40px, 6vw, 84px);
  background: var(--lb-ink-deep);
  clip-path: polygon(0 4%, 100% 0, 100% 96%, 0 100%);
}

.lb-slash--wine { background: linear-gradient(120deg, var(--lb-wine) 0%, #3A0F1C 100%); }
.lb-slash--indigo { background: linear-gradient(120deg, var(--lb-indigo) 0%, #16152F 100%); }
.lb-slash--ink { background: var(--lb-ink-deep); }

/* ---------- 5. 跳转链接 ---------- */
.lb-skip {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 200;
  padding: 10px 18px;
  background: var(--lb-orange);
  color: #06120F;
  font-size: 0.875rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  border-radius: var(--lb-radius);
  transform: translateY(-200%);
  transition: transform 0.18s var(--lb-ease);
}

.lb-skip:focus {
  transform: translateY(0);
  outline: 2px solid var(--lb-cyan);
  outline-offset: 2px;
}

/* ---------- 6. 页头 ---------- */
.lb-header {
  position: sticky;
  top: 0;
  z-index: 80;
  background: var(--lb-ink);
  border-bottom: 1px solid transparent;
  transition: border-color 0.24s var(--lb-ease);
}

.lb-header[data-condensed="true"] { border-bottom-color: var(--lb-line); }

.lb-header__top {
  background: var(--lb-ink-deep);
  border-bottom: 1px solid var(--lb-line);
  max-height: 64px;
  overflow: hidden;
  transition: max-height 0.28s var(--lb-ease), opacity 0.18s linear,
    border-color 0.28s var(--lb-ease);
}

.lb-header[data-condensed="true"] .lb-header__top {
  max-height: 0;
  opacity: 0;
  border-bottom-color: transparent;
}

.lb-header__top-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 60px;
}

.lb-header__statement {
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  color: var(--lb-mist);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.lb-header__statement::before {
  content: "◤";
  margin-right: 10px;
  font-size: 0.625rem;
  color: var(--lb-cyan);
  vertical-align: 1px;
}

.lb-header__caliber {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding-bottom: 3px;
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  color: var(--lb-mist);
  white-space: nowrap;
  border-bottom: 1px solid var(--lb-line);
  transition: color 0.18s var(--lb-ease), border-color 0.18s var(--lb-ease);
}

.lb-header__caliber:hover {
  color: var(--lb-warm);
  border-bottom-color: var(--lb-orange);
}

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

.lb-header__caliber-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--lb-cyan);
  box-shadow: 0 0 0 3px rgba(47, 230, 208, 0.16);
}

.lb-header__bar {
  position: relative;
  background: var(--lb-ink);
}

.lb-header__bar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: 68px;
}

.lb-progress {
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, var(--lb-cyan) 0%, var(--lb-orange) 100%);
  transform: scaleX(0);
  transform-origin: 0 50%;
  pointer-events: none;
}

/* 品牌 */
.lb-brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  flex: 0 0 auto;
}

.lb-brand:focus-visible {
  outline: 2px solid var(--lb-cyan);
  outline-offset: 4px;
}

.lb-brand__mark {
  width: 26px;
  height: 26px;
  flex: 0 0 auto;
  background: conic-gradient(from 200deg, var(--lb-orange), var(--lb-cyan) 55%, var(--lb-orange) 100%);
  clip-path: polygon(0 0, 100% 0, 100% 62%, 62% 100%, 0 100%);
}

.lb-brand__text {
  display: flex;
  flex-direction: column;
  line-height: 1.05;
}

.lb-brand__name {
  font-size: 1.0625rem;
  font-weight: 900;
  letter-spacing: 0.02em;
  color: var(--lb-warm);
  white-space: nowrap;
}

.lb-brand__sub {
  margin-top: 3px;
  font-family: var(--lb-font-mono);
  font-size: 0.5625rem;
  letter-spacing: 0.3em;
  color: var(--lb-mist);
  white-space: nowrap;
}

.lb-brand--footer .lb-brand__name { font-size: 1.25rem; }

/* 导航 */
.lb-nav__list {
  display: flex;
  align-items: center;
  gap: clamp(10px, 1.7vw, 30px);
}

.lb-nav__link {
  position: relative;
  display: inline-block;
  padding: 6px 2px 9px;
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--lb-mist);
  white-space: nowrap;
  transition: color 0.18s var(--lb-ease);
}

.lb-nav__link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  background: var(--lb-orange);
  transform: scaleX(0);
  transform-origin: 0 50%;
  transition: transform 0.22s var(--lb-ease);
}

.lb-nav__link:hover { color: var(--lb-warm); }
.lb-nav__link:hover::after { transform: scaleX(1); }

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

.lb-nav__link[aria-current="page"] {
  color: var(--lb-warm);
  font-weight: 700;
}

.lb-nav__link[aria-current="page"]::after { transform: scaleX(1); }

.lb-nav__aside { display: none; }

/* 抽屉开关 */
.lb-burger {
  display: none;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  border: 1px solid var(--lb-line);
  border-radius: var(--lb-radius);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.18em;
  color: var(--lb-warm);
  transition: border-color 0.18s var(--lb-ease), background-color 0.18s var(--lb-ease);
}

.lb-burger:hover { border-color: var(--lb-orange); }

.lb-burger:focus-visible {
  outline: 2px solid var(--lb-cyan);
  outline-offset: 2px;
}

.lb-burger__bars {
  display: flex;
  flex-direction: column;
  gap: 4px;
  width: 18px;
}

.lb-burger__bars i {
  display: block;
  width: 18px;
  height: 2px;
  background: currentColor;
  transition: transform 0.22s var(--lb-ease), opacity 0.18s linear,
    background-color 0.18s var(--lb-ease);
}

.lb-burger__bars i:nth-child(2) {
  width: 12px;
  background: var(--lb-orange);
}

.lb-burger[aria-expanded="true"] .lb-burger__bars i:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}

.lb-burger[aria-expanded="true"] .lb-burger__bars i:nth-child(2) {
  opacity: 0;
  transform: translateX(-6px);
}

.lb-burger[aria-expanded="true"] .lb-burger__bars i:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

html.lb-nav-open { overflow: hidden; }

/* ---------- 7. 页脚 ---------- */
.lb-footer {
  position: relative;
  margin-top: clamp(56px, 9vw, 120px);
  background: var(--lb-ink-deep);
  border-top: 1px solid var(--lb-line);
  color: var(--lb-mist);
}

.lb-footer::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(
    90deg,
    var(--lb-orange) 0 20%,
    var(--lb-cyan) 20% 36%,
    transparent 36% 100%
  );
}

.lb-footer__inner {
  padding-block: clamp(48px, 7vw, 88px) 34px;
}

.lb-footer__grid {
  display: grid;
  grid-template-columns:
    minmax(220px, 1.5fr)
    repeat(3, minmax(120px, 0.85fr))
    minmax(210px, 1.25fr);
  gap: 40px 32px;
  padding-bottom: 42px;
}

.lb-footer__brand {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.lb-footer__tagline {
  font-size: 0.875rem;
  line-height: 1.85;
  color: var(--lb-mist);
  max-width: 34ch;
}

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

.lb-footer__col-title {
  padding-bottom: 13px;
  margin-bottom: 16px;
  border-bottom: 1px solid var(--lb-line);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--lb-warm);
}

.lb-footer__list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.lb-footer__link {
  display: inline-block;
  font-size: 0.875rem;
  line-height: 1.6;
  color: var(--lb-mist);
  transition: color 0.18s var(--lb-ease), transform 0.18s var(--lb-ease);
}

.lb-footer__link:hover {
  color: var(--lb-orange);
  transform: translateX(4px);
}

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

.lb-contact-row {
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.lb-contact-label {
  font-size: 0.6875rem;
  letter-spacing: 0.18em;
  color: var(--lb-cyan);
}

.lb-contact-value {
  font-family: var(--lb-font-mono);
  font-size: 0.8125rem;
  line-height: 1.7;
  color: var(--lb-warm);
  word-break: break-word;
}

.lb-footer__legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 32px;
  padding-top: 26px;
  border-top: 1px solid var(--lb-line);
  font-family: var(--lb-font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  color: var(--lb-mist);
}

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

.lb-footer__note {
  margin-top: 16px;
  font-size: 0.75rem;
  line-height: 1.95;
  color: rgba(155, 179, 170, 0.72);
  max-width: 82ch;
}

/* ---------- 8. 通用按钮 ---------- */
.lb-btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 13px 24px;
  border: 1px solid transparent;
  border-radius: var(--lb-radius);
  font-size: 0.875rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  line-height: 1.2;
  transition: background-color 0.18s var(--lb-ease), color 0.18s var(--lb-ease),
    border-color 0.18s var(--lb-ease), transform 0.18s var(--lb-ease);
}

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

.lb-btn--primary {
  background: var(--lb-orange);
  color: #06120F;
}

.lb-btn--primary:hover {
  background: var(--lb-orange-soft);
  transform: translateY(-2px);
}

.lb-btn--ghost {
  border-color: var(--lb-line);
  color: var(--lb-warm);
}

.lb-btn--ghost:hover {
  border-color: var(--lb-cyan);
  color: var(--lb-cyan);
  transform: translateY(-2px);
}

.lb-btn--cyan {
  background: var(--lb-cyan);
  color: #06120F;
}

.lb-btn--cyan:hover {
  background: var(--lb-cyan-soft);
  transform: translateY(-2px);
}

/* ---------- 9. 面包屑 ---------- */
.lb-breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 0;
  padding-block: 22px;
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  color: var(--lb-mist);
}

.lb-breadcrumb__item {
  position: relative;
  display: inline-flex;
  align-items: center;
}

.lb-breadcrumb__item + .lb-breadcrumb__item { padding-left: 20px; }

.lb-breadcrumb__item + .lb-breadcrumb__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 10px;
  height: 1px;
  background: var(--lb-line);
}

.lb-breadcrumb__link {
  color: var(--lb-mist);
  transition: color 0.18s var(--lb-ease);
}

.lb-breadcrumb__link:hover { color: var(--lb-orange); }

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

.lb-breadcrumb__item[aria-current="page"] { color: var(--lb-warm); }

/* ---------- 10. 数据卡 ---------- */
.lb-card {
  position: relative;
  padding: clamp(18px, 2vw, 26px);
  background: rgba(6, 18, 15, 0.62);
  border: 1px solid var(--lb-line);
  border-radius: var(--lb-radius);
  box-shadow: var(--lb-shadow);
  transition: border-color 0.2s var(--lb-ease), transform 0.2s var(--lb-ease),
    background-color 0.2s var(--lb-ease);
}

.lb-card:hover {
  border-color: var(--lb-orange);
  transform: translateY(-3px);
}

.lb-card__label {
  display: block;
  margin-bottom: 12px;
  font-size: 0.6875rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--lb-mist);
}

.lb-card__value {
  display: block;
  font-family: var(--lb-font-mono);
  font-variant-numeric: tabular-nums lining-nums;
  font-size: clamp(2rem, 4.4vw, 3.75rem);
  font-weight: 500;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--lb-warm);
}

.lb-card__meta {
  display: block;
  margin-top: 12px;
  font-size: 0.8125rem;
  line-height: 1.75;
  color: var(--lb-mist);
}

.lb-card--accent { border-color: rgba(255, 107, 26, 0.55); }
.lb-card--cyan .lb-card__value { color: var(--lb-cyan); }

/* ---------- 11. 图片容器 ---------- */
.lb-figure {
  position: relative;
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--lb-line);
  border-radius: var(--lb-radius);
  background: linear-gradient(160deg, var(--lb-indigo) 0%, var(--lb-ink-deep) 64%);
}

.lb-figure__media {
  position: relative;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: var(--lb-ink-deep);
}

.lb-figure__media > img,
.lb-figure__media > video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.72) contrast(1.12) brightness(0.9);
}

.lb-figure__media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(178deg, rgba(11, 31, 26, 0.14) 0%, rgba(6, 18, 15, 0.76) 100%);
  pointer-events: none;
}

.lb-figure--square .lb-figure__media { aspect-ratio: 1 / 1; }
.lb-figure--wide .lb-figure__media { aspect-ratio: 21 / 9; }

.lb-figure--heat .lb-figure__media {
  background-image:
    radial-gradient(circle at 32% 58%, rgba(255, 107, 26, 0.5) 0%, transparent 42%),
    radial-gradient(circle at 68% 34%, rgba(47, 230, 208, 0.38) 0%, transparent 46%),
    repeating-linear-gradient(0deg, rgba(30, 58, 51, 0.5) 0 1px, transparent 1px 34px),
    repeating-linear-gradient(90deg, rgba(30, 58, 51, 0.5) 0 1px, transparent 1px 34px);
}

.lb-figure__caption {
  padding: 12px 16px;
  border-top: 1px solid var(--lb-line);
  background: rgba(6, 18, 15, 0.6);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  line-height: 1.7;
  color: var(--lb-mist);
}

/* ---------- 12. 筛选标签 ---------- */
.lb-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 13px;
  border: 1px solid var(--lb-line);
  border-radius: var(--lb-radius);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  color: var(--lb-mist);
  transition: color 0.18s var(--lb-ease), border-color 0.18s var(--lb-ease),
    opacity 0.18s var(--lb-ease);
}

.lb-tag:hover { border-color: var(--lb-cyan); color: var(--lb-cyan); }

.lb-tag:focus-visible {
  outline: 2px solid var(--lb-cyan);
  outline-offset: 2px;
}

.lb-tag--on {
  border-color: var(--lb-orange);
  color: var(--lb-orange);
}

.lb-tag--dim { opacity: 0.4; }

/* ---------- 13. 进入动效 ---------- */
.lb-reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.5s var(--lb-ease), transform 0.5s var(--lb-ease);
}

.lb-reveal[data-visible] {
  opacity: 1;
  transform: none;
}

html:not(.lb-js) .lb-reveal {
  opacity: 1;
  transform: none;
}

/* ---------- 14. 断点 ---------- */
@media (max-width: 1180px) {
  .lb-footer__grid {
    grid-template-columns: minmax(200px, 1.4fr) repeat(3, minmax(110px, 1fr));
  }
  .lb-footer__col--contact { grid-column: 1 / -1; }
  .lb-footer__col--contact .lb-footer__list {
    flex-direction: row;
    flex-wrap: wrap;
    gap: 16px 40px;
  }
}

@media (max-width: 1024px) {
  .lb-grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 940px) {
  :root { --lb-hd: 122px; }

  .lb-header[data-condensed="true"] .lb-header__top {
    max-height: 64px;
    opacity: 1;
    border-bottom-color: var(--lb-line);
  }

  .lb-header__statement { display: none; }
  .lb-header__top-inner { justify-content: flex-start; min-height: 54px; }
  .lb-header__bar-inner { min-height: 66px; gap: 14px; }

  .lb-burger { display: inline-flex; }

  .lb-nav {
    position: fixed;
    inset: 0;
    z-index: 70;
    overflow-y: auto;
    padding: calc(var(--lb-hd) + 24px) var(--lb-gutter) 48px;
    background: linear-gradient(178deg, var(--lb-ink-deep) 0%, var(--lb-ink) 78%);
    border-bottom: 1px solid transparent;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: opacity 0.18s var(--lb-ease), transform 0.26s var(--lb-ease),
      visibility 0s linear 0.26s;
  }

  .lb-nav[data-open] {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
    transition: opacity 0.18s var(--lb-ease), transform 0.26s var(--lb-ease),
      visibility 0s linear 0s;
  }

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

  .lb-nav__item { border-bottom: 1px solid var(--lb-line); }

  .lb-nav__link {
    display: block;
    padding: 18px 0;
    font-size: clamp(1.25rem, 6vw, 1.625rem);
    font-weight: 700;
    letter-spacing: -0.01em;
    color: var(--lb-warm);
  }

  .lb-nav__link::after { display: none; }

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

  .lb-nav__aside {
    display: block;
    margin-top: 40px;
    padding-top: 24px;
    border-top: 1px solid var(--lb-line);
  }

  .lb-nav__aside-title {
    margin-bottom: 10px;
    font-size: 0.75rem;
    letter-spacing: 0.18em;
    color: var(--lb-cyan);
  }

  .lb-nav__aside-text {
    margin-bottom: 20px;
    font-size: 0.875rem;
    line-height: 1.8;
    color: var(--lb-mist);
    max-width: 46ch;
  }

  .lb-nav__aside-links {
    display: flex;
    flex-wrap: wrap;
    gap: 10px 20px;
  }

  .lb-nav__aside-link {
    font-size: 0.8125rem;
    letter-spacing: 0.08em;
    color: var(--lb-mist);
    border-bottom: 1px solid var(--lb-line);
    padding-bottom: 2px;
    transition: color 0.18s var(--lb-ease), border-color 0.18s var(--lb-ease);
  }

  .lb-nav__aside-link:hover {
    color: var(--lb-warm);
    border-bottom-color: var(--lb-orange);
  }
}

@media (max-width: 900px) {
  .lb-split,
  .lb-split--flip { grid-template-columns: minmax(0, 1fr); }

  .lb-vnote {
    writing-mode: horizontal-tb;
    text-orientation: mixed;
  }
}

@media (max-width: 760px) {
  .lb-grid--2,
  .lb-grid--3,
  .lb-grid--4 { grid-template-columns: minmax(0, 1fr); }

  .lb-footer__grid { grid-template-columns: minmax(0, 1fr); gap: 34px; }

  .lb-footer__col--contact .lb-footer__list { flex-direction: column; }

  .lb-slash { clip-path: polygon(0 2%, 100% 0, 100% 98%, 0 100%); }
}

/* ---------- 15. 可访问性与减弱动效 ---------- */
:focus-visible {
  outline: 2px solid var(--lb-cyan);
  outline-offset: 3px;
}

@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;
  }

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

  .lb-header__top {
    transition: none !important;
  }
}