/* =============================================================
   乐竞体育平台APP官方主页中国 — 共享样式
   /assets/site.css
   ============================================================= */

:root {
  --color-cream: #F5F1E8;
  --color-ink: #1E1B1A;
  --color-navy: #0B1E33;
  --color-electric: #2E6FF2;
  --color-orange: #FF5A1F;
  --color-neon: #9EF01A;
  --color-pale: #EAE5D8;
  --color-grayblue: #B5C4D1;
  --color-darknavy: #09121F;
  --color-line: #D8CFBF;

  --font-display: "Noto Sans SC", "HarmonyOS Sans SC", "Source Han Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Noto Sans SC", "HarmonyOS Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --font-mono: "IBM Plex Mono", "SFMono-Regular", Consolas, "Liberation Mono", "Courier New", monospace;

  --rail: 88px;
  --header-h: 60px;
  --radius: 2px;
  --shadow-1: 0 1px 2px rgba(9, 18, 31, 0.08);
  --shadow-2: 0 10px 28px rgba(9, 18, 31, 0.18);
  --ease: 200ms ease;
  --container-w: 1280px;
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.8;
  color: var(--color-ink);
  background: var(--color-cream);
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -webkit-tap-highlight-color: transparent;
}

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

button {
  background: none;
  border: 0;
  cursor: pointer;
  font: inherit;
  color: inherit;
}

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

a:hover {
  color: var(--color-orange);
}

ul, ol {
  list-style: none;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 900;
  line-height: 1.15;
  color: var(--color-ink);
  letter-spacing: -0.01em;
}

p {
  margin-bottom: 1em;
}

strong {
  font-weight: 700;
}

::selection {
  background: var(--color-orange);
  color: var(--color-cream);
}

/* ---------- 焦点可见 ---------- */
:focus-visible {
  outline: 2px solid var(--color-orange);
  outline-offset: 3px;
}

a:focus, button:focus {
  outline: none;
}

a:focus-visible, button:focus-visible, [tabindex]:focus-visible {
  outline: 2px solid var(--color-orange);
  outline-offset: 3px;
}

#main-content:focus {
  outline: none;
}

/* ---------- 正文容器与栅格 ---------- */
.container {
  width: 100%;
  max-width: var(--container-w);
  margin: 0 auto;
  padding: clamp(32px, 6vw, 80px) clamp(20px, 4vw, 48px);
}

.container--narrow {
  max-width: 900px;
}

.container--flush {
  padding-top: 0;
}

.grid-12 {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: clamp(16px, 2.4vw, 32px);
}

.g-col-3 { grid-column: span 3; }
.g-col-4 { grid-column: span 4; }
.g-col-6 { grid-column: span 6; }
.g-col-8 { grid-column: span 8; }
.g-col-9 { grid-column: span 9; }
.g-col-12 { grid-column: 1 / -1; }

@media (max-width: 767px) {
  .g-col-3, .g-col-4, .g-col-6, .g-col-8, .g-col-9, .g-col-12 {
    grid-column: 1 / -1;
  }
}

/* ---------- 章节标题 ---------- */
.section-heading {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 16px;
  margin-bottom: 28px;
  padding-bottom: 16px;
  border-bottom: 2px solid var(--color-ink);
}

.section-heading__index {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--color-orange);
}

.section-heading__title {
  margin: 0;
  font-size: clamp(28px, 4.5vw, 46px);
  line-height: 1.1;
}

.section-heading__lead {
  margin: 0 0 0 auto;
  max-width: 440px;
  font-size: 14px;
  line-height: 1.7;
  color: #57534E;
}

@media (max-width: 767px) {
  .section-heading__lead {
    margin-left: 0;
  }
}

/* ---------- 面包屑 ---------- */
.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-bottom: 28px;
  font-size: 13px;
}

.breadcrumbs a {
  color: var(--color-navy);
  border-bottom: 1px solid transparent;
}

.breadcrumbs a:hover {
  color: var(--color-electric);
  border-bottom-color: currentColor;
}

.breadcrumbs__sep {
  font-family: var(--font-mono);
  color: var(--color-grayblue);
}

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

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 14px 24px;
  border: 2px solid var(--color-ink);
  background: transparent;
  color: var(--color-ink);
  font-family: var(--font-body);
  font-weight: 700;
  font-size: 14px;
  line-height: 1;
  text-decoration: none;
  transition: background var(--ease), color var(--ease), box-shadow var(--ease), transform var(--ease);
}

.btn:hover {
  background: var(--color-ink);
  color: var(--color-cream);
  box-shadow: 4px 4px 0 var(--color-orange);
  transform: translate(-2px, -2px);
}

.btn:active {
  transform: translate(1px, 1px);
  box-shadow: 1px 1px 0 var(--color-orange);
}

.btn--primary {
  background: var(--color-orange);
  border-color: var(--color-orange);
  color: var(--color-cream);
}

.btn--primary:hover {
  background: var(--color-cream);
  color: var(--color-orange);
  box-shadow: 4px 4px 0 var(--color-ink);
}

.btn--electric {
  background: var(--color-electric);
  border-color: var(--color-electric);
  color: #FFFFFF;
}

.btn--electric:hover {
  background: transparent;
  color: var(--color-electric);
  border-color: var(--color-electric);
  box-shadow: 4px 4px 0 rgba(46, 111, 242, 0.35);
}

.btn--neon {
  background: var(--color-neon);
  border-color: var(--color-neon);
  color: var(--color-darknavy);
}

.btn--neon:hover {
  background: transparent;
  color: var(--color-neon);
  border-color: var(--color-neon);
  box-shadow: 4px 4px 0 rgba(158, 240, 26, 0.25);
}

.btn--ghost {
  border-color: rgba(181, 196, 209, 0.45);
  color: var(--color-cream);
}

.btn--ghost:hover {
  border-color: var(--color-neon);
  color: var(--color-neon);
  background: transparent;
  box-shadow: 4px 4px 0 rgba(158, 240, 26, 0.2);
}

.btn--sm {
  padding: 10px 16px;
  font-size: 12px;
}

/* ---------- 卡片 ---------- */
.card {
  position: relative;
  padding: clamp(20px, 3vw, 32px);
  background: var(--color-cream);
  border: 1px solid var(--color-line);
  box-shadow: var(--shadow-1);
  transition: transform var(--ease), box-shadow var(--ease), border-color var(--ease);
}

@media (hover: hover) {
  .card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-2);
    border-color: rgba(46, 111, 242, 0.45);
  }
}

.card--dark {
  background: var(--color-navy);
  border-color: var(--color-navy);
}

.card--dark, .card--dark h2, .card--dark h3, .card--dark h4 {
  color: var(--color-cream);
}

.card--dark p {
  color: var(--color-grayblue);
}

.card--accent {
  border-top: 4px solid var(--color-orange);
}

.card--diagonal {
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 18px), calc(100% - 18px) 100%, 0 100%);
}

.card--flat {
  box-shadow: none;
}

/* ---------- 路由预览卡 ---------- */
.route-card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 24px;
  border: 1px solid var(--color-line);
  background: var(--color-cream);
  color: var(--color-ink);
  text-decoration: none;
  transition: transform var(--ease), box-shadow var(--ease), border-color var(--ease);
}

.route-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-2);
  border-color: rgba(46, 111, 242, 0.45);
  color: var(--color-ink);
}

.route-card__index {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--color-orange);
}

.route-card__title {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 900;
  line-height: 1.3;
}

.route-card__desc {
  font-size: 13px;
  line-height: 1.7;
  color: #57534E;
}

/* ---------- 面板 ---------- */
.panel {
  position: relative;
  padding: clamp(24px, 4vw, 44px);
  border: 1px solid var(--color-line);
  background: var(--color-pale);
}

.panel::before {
  content: "";
  position: absolute;
  top: -1px;
  left: -1px;
  width: 26px;
  height: 26px;
  border-top: 4px solid var(--color-electric);
  border-left: 4px solid var(--color-electric);
}

.panel--cream {
  background: var(--color-cream);
}

.panel--navy {
  background: var(--color-navy);
  border-color: var(--color-navy);
}

.panel--navy, .panel--navy h2, .panel--navy h3, .panel--navy h4 {
  color: var(--color-cream);
}

.panel--navy p {
  color: var(--color-grayblue);
}

.panel--navy::before {
  border-color: var(--color-neon);
}

/* ---------- 标签与坐标 ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 5px 10px;
  border: 1px solid var(--color-line);
  background: var(--color-pale);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-navy);
}

.tag--orange {
  background: var(--color-orange);
  border-color: var(--color-orange);
  color: var(--color-cream);
}

.tag--neon {
  background: var(--color-neon);
  border-color: var(--color-neon);
  color: var(--color-darknavy);
}

.tag--blue {
  background: rgba(46, 111, 242, 0.08);
  border-color: rgba(46, 111, 242, 0.4);
  color: var(--color-electric);
}

.coords {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 16px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-grayblue);
}

/* ---------- 首屏 ---------- */
.hero {
  position: relative;
  padding: clamp(48px, 8vw, 96px) 0;
  border-bottom: 1px solid var(--color-line);
  background: var(--color-cream);
}

.hero--grid {
  background-image:
    linear-gradient(rgba(46, 111, 242, 0.08) 1px, transparent 1px),
    linear-gradient(90deg, rgba(46, 111, 242, 0.08) 1px, transparent 1px);
  background-size: 32px 32px;
}

.hero__inner {
  max-width: var(--container-w);
  margin: 0 auto;
  padding: 0 clamp(20px, 4vw, 48px);
  display: grid;
  gap: 32px;
}

/* ---------- 图片容器 ---------- */
.media {
  position: relative;
  display: block;
  aspect-ratio: 4 / 3;
  background-color: var(--color-pale);
  background-image:
    linear-gradient(to right, rgba(46, 111, 242, 0.12) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(46, 111, 242, 0.12) 1px, transparent 1px);
  background-size: 24px 24px;
  border: 1px solid var(--color-line);
  overflow: hidden;
}

.media::before {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  width: 42px;
  height: 1px;
  background: rgba(46, 111, 242, 0.4);
  transform: translate(-50%, -50%);
  z-index: 1;
}

.media::after {
  content: "IMG";
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  padding: 6px 10px;
  background: rgba(245, 241, 232, 0.86);
  border: 1px solid var(--color-line);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.3em;
  color: rgba(46, 111, 242, 0.7);
  text-align: center;
  white-space: nowrap;
  z-index: 1;
}

.media > img {
  position: absolute;
  inset: 0;
  z-index: 2;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media--portrait {
  aspect-ratio: 3 / 4;
}

.media--wide {
  aspect-ratio: 16 / 9;
}

.media--diagonal {
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 24px), calc(100% - 24px) 100%, 0 100%);
}

/* ---------- 数据表 ---------- */
.data-table-wrap {
  overflow-x: auto;
  border: 1px solid var(--color-line);
  background: var(--color-cream);
  box-shadow: var(--shadow-1);
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
  line-height: 1.5;
  color: var(--color-ink);
}

.data-table caption {
  padding: 12px 14px;
  border-bottom: 1px solid var(--color-line);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-grayblue);
  text-align: left;
}

.data-table th {
  padding: 12px 14px;
  background: var(--color-pale);
  border-bottom: 2px solid var(--color-navy);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-navy);
  text-align: left;
  white-space: nowrap;
}

.data-table th[data-sort] {
  cursor: pointer;
}

.data-table th[data-sort]:hover {
  background: rgba(46, 111, 242, 0.1);
  color: var(--color-electric);
}

.data-table th[aria-sort="ascending"]::after {
  content: " ▲";
  color: var(--color-orange);
}

.data-table th[aria-sort="descending"]::after {
  content: " ▼";
  color: var(--color-orange);
}

.data-table td {
  padding: 12px 14px;
  border-bottom: 1px solid var(--color-line);
  vertical-align: top;
}

.data-table tbody tr:hover {
  background: rgba(46, 111, 242, 0.05);
}

.data-table tfoot td {
  padding: 14px;
  background: var(--color-pale);
  font-size: 12px;
  color: var(--color-grayblue);
}

.data-table .num {
  text-align: right;
  font-family: var(--font-mono);
  font-feature-settings: "tnum";
}

/* =============================================================
   共享头部
   ============================================================= */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  height: var(--header-h);
  background: var(--color-darknavy);
  border-bottom: 1px solid rgba(46, 111, 242, 0.28);
}

.site-header__inner {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  padding: 0 16px;
}

.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 3000;
  padding: 12px 20px;
  background: var(--color-orange);
  color: var(--color-cream);
  font-weight: 700;
  font-size: 13px;
  letter-spacing: 0.08em;
  border-radius: var(--radius);
  transform: translateY(-300%);
  transition: transform var(--ease);
}

.skip-link:focus {
  transform: translateY(0);
}

.brand {
  display: inline-flex;
  align-items: baseline;
  gap: 10px;
  line-height: 1;
  text-decoration: none;
}

.brand__logo {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 18px;
  letter-spacing: 0.1em;
  color: var(--color-cream);
}

.brand__dot {
  color: var(--color-neon);
}

.brand__sub {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-grayblue);
}

.nav-toggle {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 10px 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-cream);
}

.nav-toggle:hover {
  color: var(--color-neon);
}

.nav-toggle__icon {
  position: relative;
  display: inline-block;
  width: 20px;
  height: 14px;
}

.nav-toggle__icon::before,
.nav-toggle__icon::after {
  content: "";
  position: absolute;
  left: 0;
  width: 100%;
  height: 2px;
  background: currentColor;
  transition: top 220ms ease, bottom 220ms ease, transform 220ms ease;
}

.nav-toggle__icon::before {
  top: 1px;
}

.nav-toggle__icon::after {
  bottom: 1px;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__icon::before {
  top: 6px;
  transform: rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__icon::after {
  bottom: 6px;
  transform: rotate(-45deg);
}

.site-nav {
  position: fixed;
  top: var(--header-h);
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 990;
  display: flex;
  flex-direction: column;
  padding: 24px clamp(20px, 6vw, 48px) 40px;
  background:
    linear-gradient(180deg, rgba(11, 30, 51, 0.97), rgba(9, 18, 31, 0.99)),
    repeating-linear-gradient(0deg, transparent 0 31px, rgba(181, 196, 209, 0.07) 31px 32px);
  border-bottom: 1px solid rgba(46, 111, 242, 0.3);
  overflow-y: auto;
  transform: translateX(-100%);
  visibility: hidden;
  transition: transform 220ms ease, visibility 220ms ease;
}

.site-nav[data-open] {
  transform: translateX(0);
  visibility: visible;
}

.site-nav__meta {
  padding: 8px 4px 16px;
  border-bottom: 1px solid rgba(181, 196, 209, 0.16);
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-grayblue);
}

.site-nav__link {
  position: relative;
  display: flex;
  align-items: center;
  gap: 18px;
  padding: 15px 8px;
  border-bottom: 1px solid rgba(181, 196, 209, 0.12);
  color: var(--color-cream);
  text-decoration: none;
}

.site-nav__link:hover {
  background: rgba(46, 111, 242, 0.14);
}

.site-nav__link[aria-current="page"] {
  background: linear-gradient(90deg, rgba(46, 111, 242, 0.22), transparent);
}

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

.site-nav__link[aria-current="page"] .site-nav__label {
  color: #FFFFFF;
}

.site-nav__index {
  min-width: 26px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--color-grayblue);
}

.site-nav__label {
  font-size: 17px;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.header__cta {
  display: none;
}

/* ---------- 滚动进度 ---------- */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  z-index: 2000;
  pointer-events: none;
  background: rgba(9, 18, 31, 0.35);
}

.scroll-progress__bar {
  display: block;
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, var(--color-electric), var(--color-neon) 70%, var(--color-orange));
  transition: width 80ms linear;
}

/* =============================================================
   共享页脚
   ============================================================= */
.site-footer {
  position: relative;
  z-index: 10;
  background: var(--color-darknavy);
  color: var(--color-cream);
  border-top: 3px solid var(--color-orange);
}

.site-footer::before {
  content: "";
  display: block;
  height: 1px;
  background: linear-gradient(90deg, var(--color-electric), var(--color-neon) 45%, transparent 75%);
}

.site-footer__grid {
  display: grid;
  gap: 40px;
  max-width: var(--container-w);
  margin: 0 auto;
  padding: clamp(40px, 6vw, 80px) clamp(20px, 4vw, 48px) 40px;
}

@media (min-width: 768px) {
  .site-footer__grid {
    grid-template-columns: 1.5fr 0.7fr 1.2fr;
    gap: 48px;
  }
}

.site-footer__brand {
  display: grid;
  gap: 16px;
  align-content: start;
}

.site-footer__logo {
  margin: 0;
  font-size: 26px;
  letter-spacing: 0.08em;
  color: var(--color-cream);
}

.site-footer__dot {
  color: var(--color-neon);
}

.site-footer__about {
  max-width: 44ch;
  font-size: 14px;
  line-height: 1.8;
  color: var(--color-grayblue);
}

.site-footer__trust {
  margin: 0;
  padding: 16px 18px;
  border-left: 3px solid var(--color-neon);
  background: rgba(158, 240, 26, 0.06);
  font-size: 13px;
  line-height: 1.7;
  color: #C6D4E0;
}

.site-footer__nav {
  display: grid;
  gap: 2px;
  align-content: start;
}

.site-footer__heading {
  margin: 0 0 12px;
  padding-bottom: 10px;
  border-bottom: 1px solid rgba(181, 196, 209, 0.16);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 400;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--color-neon);
}

.site-footer__link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 0;
  border-bottom: 1px solid rgba(181, 196, 209, 0.1);
  color: var(--color-grayblue);
  font-size: 14px;
  text-decoration: none;
}

.site-footer__link::after {
  content: "↗";
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-orange);
  opacity: 0;
  transform: translateY(2px);
  transition: opacity var(--ease), transform var(--ease);
}

.site-footer__link:hover {
  color: var(--color-cream);
}

.site-footer__link:hover::after {
  opacity: 1;
  transform: translateY(0);
}

.site-footer__contact {
  display: grid;
  gap: 12px;
  align-content: start;
  font-size: 13px;
  line-height: 1.7;
  color: var(--color-grayblue);
}

.site-footer__item {
  margin: 0;
}

.site-footer__item strong {
  display: inline-block;
  margin-bottom: 2px;
  color: var(--color-cream);
}

.site-footer__bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 24px;
  max-width: var(--container-w);
  margin: 0 auto;
  padding: 18px clamp(20px, 4vw, 48px);
  border-top: 1px solid rgba(181, 196, 209, 0.14);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--color-grayblue);
}

.site-footer__bar > span {
  white-space: nowrap;
}

/* =============================================================
   桌面端：侧边轨道
   ============================================================= */
@media (min-width: 1024px) {
  .skip-link {
    left: calc(var(--rail) + 16px);
  }

  .site-header {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    width: var(--rail);
    height: auto;
    border-right: 1px solid rgba(46, 111, 242, 0.3);
    border-bottom: 0;
    background:
      repeating-linear-gradient(180deg, transparent 0 31px, rgba(181, 196, 209, 0.05) 31px 32px),
      linear-gradient(180deg, var(--color-navy), var(--color-darknavy));
  }

  .site-header::after {
    content: "";
    position: absolute;
    right: 0;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(180deg, var(--color-electric), transparent 60%, var(--color-neon));
    opacity: 0.5;
    pointer-events: none;
  }

  .site-header__inner {
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    height: 100%;
    padding: 0;
  }

  .brand {
    flex-direction: column;
    align-items: center;
    gap: 6px;
    padding: 26px 8px 18px;
    border-bottom: 1px solid rgba(181, 196, 209, 0.14);
    text-align: center;
  }

  .brand__logo {
    font-size: 14px;
    letter-spacing: 0.16em;
  }

  .brand__sub {
    font-size: 8px;
    letter-spacing: 0.22em;
  }

  .nav-toggle {
    display: none;
  }

  .site-nav {
    position: static;
    flex: 1;
    transform: none;
    visibility: visible;
    overflow-y: auto;
    scrollbar-width: none;
    padding: 16px 6px 8px;
    gap: 4px;
    background: none;
    border-bottom: 0;
  }

  .site-nav::-webkit-scrollbar {
    display: none;
  }

  .site-nav__meta {
    display: none;
  }

  .site-nav__link {
    flex-direction: column;
    align-items: center;
    gap: 6px;
    padding: 12px 4px;
    border-bottom: 0;
  }

  .site-nav__link:hover {
    background: rgba(46, 111, 242, 0.16);
  }

  .site-nav__index {
    min-width: 0;
    font-size: 10px;
  }

  .site-nav__label {
    writing-mode: vertical-rl;
    font-size: 12px;
    font-weight: 500;
    letter-spacing: 0.22em;
  }

  .site-nav__link[aria-current="page"]::before {
    content: "";
    position: absolute;
    left: -6px;
    top: 12px;
    bottom: 12px;
    width: 3px;
    background: var(--color-orange);
    box-shadow: 0 0 12px rgba(255, 90, 31, 0.8);
  }

  .header__cta {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 8px;
    margin: 10px;
    padding: 22px 0;
    background: var(--color-orange);
    border: 2px solid var(--color-orange);
    color: var(--color-cream);
    text-decoration: none;
    transition: background var(--ease), color var(--ease), border-color var(--ease);
  }

  .header__cta:hover {
    background: transparent;
    color: var(--color-neon);
    border-color: var(--color-neon);
  }

  .header__cta-label {
    writing-mode: vertical-rl;
    font-size: 13px;
    font-weight: 700;
    letter-spacing: 0.3em;
  }

  .header__cta-index {
    font-family: var(--font-mono);
    font-size: 8px;
    letter-spacing: 0.24em;
    text-transform: uppercase;
    color: var(--color-grayblue);
  }

  .site-main,
  .site-footer {
    margin-left: var(--rail);
  }
}

/* =============================================================
   缩减动效
   ============================================================= */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *, *::before, *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}

@media (max-width: 380px) {
  .brand__sub {
    display: none;
  }
}