/* ============================================================
   IM电竞 · 完美体育 全站共享样式 /assets/site.css
   移动优先：顶栏 + 抽屉导航；桌面：左侧轨道 + 右侧内容区
   ============================================================ */

/* ---------- 变量 ---------- */
:root {
  --c-bg: #0B0F19;
  --c-bg-alt: #131A2A;
  --c-accent: #00D4FF;
  --c-accent-alt: #9B5DE5;
  --c-metal: #C0C0C0;
  --c-cta: #FF6B35;
  --c-text: #FFFFFF;
  --c-muted: #8A94A6;

  --font-display: Impact, 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-body: 'Noto Sans SC', 'Roboto', 'PingFang SC', 'Microsoft YaHei', sans-serif;

  --header-w: 280px;
  --content-max: 1240px;
  --shadow-accent: 2px 2px 0 rgba(0, 212, 255, 0.7);
}

/* ---------- Reset 与基础 ---------- */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  background: var(--c-bg);
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  color: var(--c-text);
  background: var(--c-bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

main {
  display: block;
}

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

img {
  max-width: 100%;
  height: auto;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  margin: 0 0 1rem;
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: 1px;
  color: var(--c-text);
}

h1,
h2,
h3 {
  text-shadow: var(--shadow-accent);
}

h4,
h5,
h6 {
  text-shadow: 1px 1px 0 rgba(0, 212, 255, 0.45);
}

p {
  margin: 0 0 1.25rem;
}

ul,
ol {
  margin: 0 0 1.25rem;
  padding-left: 1.5rem;
}

li {
  margin-bottom: 0.35rem;
}

a {
  color: var(--c-accent);
  transition: color 0.2s ease;
}

a:hover {
  color: var(--c-cta);
}

blockquote {
  margin: 1.5rem 0;
  padding: 1rem 1.5rem;
  border-left: 4px solid var(--c-accent);
  background: rgba(0, 212, 255, 0.05);
  color: var(--c-muted);
}

hr {
  border: 0;
  height: 1px;
  background: rgba(192, 192, 192, 0.15);
  margin: 2.5rem 0;
}

::selection {
  background: var(--c-accent);
  color: var(--c-bg);
}

:focus-visible {
  outline: 2px solid var(--c-accent);
  outline-offset: 3px;
}

/* ---------- 工具类 ---------- */
.visually-hidden {
  position: absolute !important;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  border: 0;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  overflow: hidden;
  white-space: nowrap;
}

.text-accent {
  color: var(--c-accent);
}

.text-cta {
  color: var(--c-cta);
}

.text-muted {
  color: var(--c-muted);
}

/* ---------- 布局 ---------- */
.container {
  width: 100%;
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.container--narrow {
  max-width: 880px;
}

.section {
  padding: 3.5rem 0;
}

.section--tight {
  padding: 2rem 0;
}

.section-title {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
}

.section-title::before {
  content: '';
  width: 6px;
  height: 1.4em;
  background: linear-gradient(180deg, var(--c-accent), var(--c-accent-alt));
  flex-shrink: 0;
}

.grid {
  display: grid;
  gap: 1.5rem;
}

.grid--2,
.grid--3,
.grid--4 {
  grid-template-columns: 1fr;
}

@media (min-width: 640px) {
  .grid--2,
  .grid--3,
  .grid--4 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .grid--2 {
    grid-template-columns: repeat(2, 1fr);
  }
  .grid--3 {
    grid-template-columns: repeat(3, 1fr);
  }
  .grid--4 {
    grid-template-columns: repeat(4, 1fr);
  }
}

.card-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

@media (min-width: 640px) {
  .card-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .card-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.overlap {
  margin-top: -3rem;
}

@media (max-width: 1023px) {
  .overlap {
    margin-top: 0;
  }
}

.tilt {
  transform: rotate(-1deg);
}

.tilt--alt {
  transform: rotate(1.25deg);
}

/* ---------- 页头与目录 ---------- */
.page-header {
  padding: 3rem 0 2rem;
  border-bottom: 1px solid rgba(192, 192, 192, 0.15);
  margin-bottom: 2.5rem;
}

.page-header__title {
  font-size: clamp(2.25rem, 5vw, 4rem);
  line-height: 1.02;
  margin-bottom: 0.75rem;
}

.page-header__intro {
  margin: 0;
  max-width: 72ch;
  font-size: 1.0625rem;
  color: var(--c-muted);
}

.toc {
  background: var(--c-bg-alt);
  border: 1px solid rgba(192, 192, 192, 0.15);
  border-left: 3px solid var(--c-accent);
  padding: 1.5rem;
}

.toc__title {
  font-size: 0.9375rem;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--c-accent);
  text-shadow: none;
  margin-bottom: 0.75rem;
}

.toc__list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.toc__link {
  display: block;
  padding: 0.45rem 0;
  color: var(--c-muted);
  text-decoration: none;
  border-bottom: 1px dashed rgba(192, 192, 192, 0.12);
  transition: color 0.2s ease, padding-left 0.2s ease;
}

.toc__link:hover {
  color: var(--c-accent);
  padding-left: 0.5rem;
}

/* ---------- 面包屑 ---------- */
.breadcrumb {
  padding: 1.5rem 0 0.5rem;
  font-size: 0.875rem;
}

.breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  list-style: none;
  margin: 0;
  padding: 0;
}

.breadcrumb__item {
  display: inline-flex;
  align-items: center;
  color: var(--c-muted);
}

.breadcrumb__item:not(:last-child)::after {
  content: '›';
  margin: 0 0.5rem;
  color: var(--c-muted);
}

.breadcrumb__item a {
  color: var(--c-accent);
  text-decoration: none;
  transition: color 0.2s ease;
}

.breadcrumb__item a:hover {
  color: var(--c-cta);
}

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

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.85rem 1.75rem;
  border: 1px solid transparent;
  border-radius: 3px;
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 700;
  font-size: 1rem;
  letter-spacing: 1px;
  line-height: 1;
  text-decoration: none;
  cursor: pointer;
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
}

.btn:hover {
  transform: translate(-1px, -1px);
}

.btn--primary {
  background: var(--c-cta);
  color: var(--c-bg);
  box-shadow: 4px 4px 0 var(--c-accent);
}

.btn--primary:hover {
  background: var(--c-accent);
  color: var(--c-bg);
  box-shadow: 6px 6px 0 var(--c-cta);
}

.btn--ghost {
  background: transparent;
  border-color: rgba(192, 192, 192, 0.5);
  color: var(--c-text);
}

.btn--ghost:hover {
  border-color: var(--c-accent);
  color: var(--c-accent);
  box-shadow: 0 0 16px rgba(0, 212, 255, 0.25);
}

.btn--block {
  display: flex;
  width: 100%;
}

/* ---------- 徽章与标签 ---------- */
.badge {
  display: inline-block;
  padding: 0.3rem 0.8rem;
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 700;
  font-size: 0.75rem;
  letter-spacing: 1px;
  text-transform: uppercase;
  background: var(--c-accent);
  color: var(--c-bg);
  transform: skewX(-8deg);
}

.badge--alt {
  background: var(--c-accent-alt);
  color: var(--c-text);
}

.badge--cta {
  background: var(--c-cta);
  color: var(--c-bg);
}

.tag {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  border: 1px solid var(--c-accent);
  border-radius: 999px;
  background: rgba(0, 212, 255, 0.08);
  color: var(--c-text);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.5px;
  line-height: 1.5;
}

.tag--alt {
  border-color: var(--c-accent-alt);
  background: rgba(155, 93, 229, 0.1);
}

.tag--cta {
  border-color: var(--c-cta);
  background: rgba(255, 107, 53, 0.1);
}

/* ---------- 卡片 ---------- */
.card {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  padding: 1.5rem;
  background: var(--c-bg-alt);
  border: 1px solid rgba(192, 192, 192, 0.15);
  border-top: 3px solid var(--c-accent);
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 14px 36px rgba(0, 0, 0, 0.45), 0 0 20px rgba(0, 212, 255, 0.1);
}

.card--alt {
  border-top-color: var(--c-accent-alt);
}

.card--cta {
  border-top-color: var(--c-cta);
}

.card__title {
  margin-bottom: 0.25rem;
  font-size: 1.25rem;
  text-shadow: 1px 1px 0 rgba(0, 212, 255, 0.4);
}

.card__text {
  margin: 0;
  font-size: 0.9375rem;
  color: var(--c-muted);
}

.card__link {
  margin-top: auto;
  font-family: var(--font-display);
  font-style: italic;
  font-size: 0.9375rem;
  text-decoration: none;
  color: var(--c-accent);
}

.card__link:hover {
  color: var(--c-cta);
}

/* ---------- 旁注 ---------- */
.callout {
  padding: 1.5rem;
  background: var(--c-bg-alt);
  border-left: 4px solid var(--c-accent);
  border-radius: 0 6px 6px 0;
  color: var(--c-text);
}

.callout--warn {
  border-left-color: var(--c-cta);
  background: rgba(255, 107, 53, 0.06);
}

.callout--info {
  border-left-color: var(--c-accent-alt);
  background: rgba(155, 93, 229, 0.06);
}

.callout__title {
  margin-bottom: 0.5rem;
  font-size: 1.0625rem;
  text-shadow: none;
}

.callout p {
  margin-bottom: 0.5rem;
}

.callout p:last-child {
  margin-bottom: 0;
}

/* ---------- 时间轴 ---------- */
.timeline {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.timeline__item {
  position: relative;
  padding: 0 0 1.5rem 1.75rem;
  border-left: 1px solid rgba(192, 192, 192, 0.2);
}

.timeline__item:last-child {
  padding-bottom: 0;
}

.timeline__item::before {
  content: '';
  position: absolute;
  left: -5px;
  top: 0.5rem;
  width: 9px;
  height: 9px;
  background: var(--c-accent);
  box-shadow: 0 0 8px rgba(0, 212, 255, 0.8);
  transform: rotate(45deg);
}

.timeline__time {
  display: block;
  font-family: var(--font-display);
  font-style: italic;
  font-size: 0.875rem;
  letter-spacing: 1px;
  color: var(--c-muted);
  margin-bottom: 0.25rem;
}

.timeline__title {
  margin-bottom: 0.25rem;
  font-size: 1.125rem;
}

.timeline__text {
  margin: 0;
  font-size: 0.9375rem;
  color: var(--c-muted);
}

/* ---------- 表格 ---------- */
.table-wrap {
  overflow-x: auto;
  border: 1px solid rgba(192, 192, 192, 0.15);
  background: var(--c-bg-alt);
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9375rem;
}

.data-table th,
.data-table td {
  padding: 0.875rem 1rem;
  text-align: left;
  border-bottom: 1px solid rgba(192, 192, 192, 0.1);
  white-space: nowrap;
}

.data-table th {
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 700;
  letter-spacing: 1px;
  color: var(--c-accent);
  background: rgba(0, 212, 255, 0.04);
}

.data-table tbody tr {
  transition: background 0.2s ease;
}

.data-table tbody tr:hover {
  background: rgba(0, 212, 255, 0.04);
}

.data-table tbody tr:last-child td {
  border-bottom: 0;
}

/* ---------- 媒体框 ---------- */
.media-frame {
  position: relative;
  overflow: hidden;
  background: var(--c-bg-alt);
  box-shadow: inset 0 0 0 1px rgba(192, 192, 192, 0.18);
  clip-path: polygon(0 0, calc(100% - 20px) 0, 100% 20px, 100% 100%, 0 100%);
}

.media-frame::before {
  content: '';
  display: block;
  padding-top: 56.25%;
}

.media-frame--poster::before {
  padding-top: 133.33%;
}

.media-frame--square::before {
  padding-top: 100%;
}

.media-frame::after {
  content: 'IM ESPORTS';
  position: absolute;
  inset: 0;
  z-index: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-style: italic;
  font-size: 0.875rem;
  letter-spacing: 5px;
  color: rgba(192, 192, 192, 0.35);
  background: repeating-linear-gradient(-45deg, transparent 0 14px, rgba(0, 212, 255, 0.035) 14px 28px);
}

.media-frame img {
  position: absolute;
  inset: 0;
  z-index: 1;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ---------- 分隔线 ---------- */
.divider {
  border: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--c-accent), var(--c-accent-alt), var(--c-cta));
  opacity: 0.7;
  margin: 3rem 0;
}

/* ============================================================
   共享 Header（移动端：顶栏 + 抽屉；桌面端：左侧轨道）
   ============================================================ */
.skip-link {
  position: fixed;
  top: 0.75rem;
  left: 0.75rem;
  z-index: 600;
  display: inline-block;
  padding: 0.75rem 1.25rem;
  background: var(--c-accent);
  color: var(--c-bg);
  font-weight: 700;
  font-size: 0.9375rem;
  border-radius: 3px;
  text-decoration: none;
  transform: translateY(calc(-100% - 1rem));
  transition: transform 0.2s ease;
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 300;
  background: rgba(11, 15, 25, 0.96);
  border-bottom: 1px solid rgba(192, 192, 192, 0.16);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.75rem 1.25rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  flex-shrink: 0;
  text-decoration: none;
  color: var(--c-text);
}

.brand:hover {
  color: var(--c-text);
}

.brand__mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 700;
  font-size: 1.125rem;
  line-height: 1;
  color: var(--c-bg);
  background: linear-gradient(135deg, var(--c-accent), var(--c-accent-alt));
  clip-path: polygon(0 0, 100% 0, 100% 72%, 72% 100%, 0 100%);
  filter: drop-shadow(0 0 8px rgba(0, 212, 255, 0.5));
}

.brand__text {
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 700;
  font-size: 1.25rem;
  letter-spacing: 2px;
  text-shadow: 2px 2px 0 rgba(0, 212, 255, 0.8);
}

.nav-toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.55rem 0.85rem;
  background: transparent;
  border: 1px solid rgba(192, 192, 192, 0.3);
  border-radius: 3px;
  color: var(--c-text);
  font-family: var(--font-body);
  font-size: 0.875rem;
  line-height: 1;
  cursor: pointer;
  transition: border-color 0.2s ease, background 0.2s ease;
  position: relative;
  z-index: 320;
}

.nav-toggle:hover {
  border-color: var(--c-accent);
  background: rgba(0, 212, 255, 0.06);
}

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

.nav-toggle__bar {
  display: block;
  height: 2px;
  background: var(--c-accent);
  transition: transform 0.25s ease, opacity 0.25s ease;
}

.nav-toggle__label {
  font-weight: 500;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(1) {
  transform: translateY(5px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(3) {
  transform: translateY(-5px) rotate(-45deg);
}

.site-nav {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  z-index: 310;
  width: min(320px, 85vw);
  padding: 6rem 1.5rem 2rem;
  background: var(--c-bg-alt);
  border-left: 1px solid rgba(192, 192, 192, 0.18);
  transform: translateX(105%);
  visibility: hidden;
  transition: transform 0.3s ease, visibility 0s linear 0.3s;
  overflow-y: auto;
}

.site-nav[data-open] {
  transform: translateX(0);
  visibility: visible;
  transition: transform 0.3s ease;
}

.site-nav__list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.site-nav__item {
  margin: 0;
}

.site-nav__item:last-child .site-nav__link {
  border-bottom: 0;
}

.site-nav__link {
  display: block;
  padding: 0.85rem 0.75rem;
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 700;
  font-size: 1.0625rem;
  letter-spacing: 1px;
  color: var(--c-text);
  text-decoration: none;
  border-bottom: 1px solid rgba(192, 192, 192, 0.08);
  transition: color 0.2s ease, background 0.2s ease;
}

.site-nav__link:hover {
  color: var(--c-accent);
  background: rgba(0, 212, 255, 0.05);
}

.site-nav__link[aria-current="page"] {
  color: var(--c-accent);
  background: rgba(0, 212, 255, 0.08);
  border-bottom-color: rgba(0, 212, 255, 0.35);
}

.site-header__meta {
  display: none;
}

.site-header__status {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.75rem;
  letter-spacing: 2px;
  color: var(--c-muted);
  text-transform: uppercase;
}

.site-header__pulse {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--c-cta);
  box-shadow: 0 0 10px rgba(255, 107, 53, 0.8);
  animation: pulse-glow 2.4s ease-in-out infinite;
}

@keyframes pulse-glow {
  0%,
  100% {
    opacity: 1;
    transform: scale(1);
  }
  50% {
    opacity: 0.5;
    transform: scale(0.8);
  }
}

body[data-nav-open]::after {
  content: '';
  position: fixed;
  inset: 0;
  z-index: 250;
  background: rgba(4, 7, 14, 0.72);
  -webkit-backdrop-filter: blur(2px);
  backdrop-filter: blur(2px);
}

/* ---------- 阅读进度 ---------- */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  z-index: 400;
  background: linear-gradient(90deg, var(--c-accent), var(--c-accent-alt) 55%, var(--c-cta));
  transform-origin: 0 50%;
  transform: scaleX(0);
  pointer-events: none;
}

/* ============================================================
   共享 Footer
   ============================================================ */
.site-footer {
  margin-top: 4rem;
  border-top: 3px solid var(--c-accent);
  background:
    radial-gradient(900px 240px at 85% 0%, rgba(155, 93, 229, 0.1), transparent 60%),
    radial-gradient(700px 180px at 10% 100%, rgba(0, 212, 255, 0.06), transparent 60%),
    var(--c-bg-alt);
}

.site-footer__inner {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 3.5rem 1.5rem 2rem;
}

.site-footer__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
}

@media (min-width: 640px) {
  .site-footer__grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .site-footer__grid {
    grid-template-columns: 1.5fr 1fr 1fr 1.3fr;
    gap: 3rem;
  }
}

.site-footer__brand-col {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.brand--footer .brand__mark {
  width: 40px;
  height: 40px;
  font-size: 1.125rem;
}

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

.site-footer__about {
  margin: 0;
  max-width: 38ch;
  font-size: 0.9375rem;
  color: var(--c-muted);
}

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

.site-footer__heading {
  margin: 0 0 1rem;
  font-family: var(--font-display);
  font-style: italic;
  font-size: 1rem;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--c-accent);
  text-shadow: none;
}

.site-footer__links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.site-footer__links a {
  display: inline-block;
  color: var(--c-muted);
  text-decoration: none;
  font-size: 0.9375rem;
  transition: color 0.2s ease, padding-left 0.2s ease;
}

.site-footer__links a:hover {
  color: var(--c-accent);
  padding-left: 0.375rem;
}

.site-footer__contact {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  font-size: 0.875rem;
  color: var(--c-muted);
}

.site-footer__contact-item {
  line-height: 1.6;
}

.site-footer__bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem 2rem;
  padding-top: 1.5rem;
  margin-top: 3rem;
  border-top: 1px solid rgba(192, 192, 192, 0.15);
  font-size: 0.8125rem;
  color: var(--c-muted);
}

.site-footer__bottom > * {
  margin: 0;
}

.site-footer__trust {
  flex-basis: 100%;
  text-align: center;
  font-size: 0.75rem;
  line-height: 1.6;
  color: rgba(138, 148, 166, 0.9);
}

/* ============================================================
   桌面端左侧轨道
   ============================================================ */
@media (min-width: 1024px) {
  body {
    margin-left: var(--header-w);
  }

  .site-header {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    width: var(--header-w);
    background: var(--c-bg-alt);
    border-bottom: 0;
    border-right: 1px solid rgba(192, 192, 192, 0.16);
  }

  .site-header__inner {
    flex-direction: column;
    justify-content: flex-start;
    align-items: stretch;
    height: 100%;
    padding: 2rem 1.5rem 1.5rem;
    gap: 2.25rem;
    overflow-y: auto;
  }

  .brand__mark {
    width: 48px;
    height: 48px;
    font-size: 1.375rem;
  }

  .brand__text {
    font-size: 1.5rem;
  }

  .nav-toggle {
    display: none;
  }

  .site-nav {
    position: static;
    width: auto;
    padding: 0;
    border: 0;
    background: transparent;
    transform: none;
    visibility: visible;
    transition: none;
    overflow: visible;
  }

  .site-nav__list {
    position: relative;
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
  }

  .site-nav__list::before {
    content: '';
    position: absolute;
    left: 6px;
    top: 0.5rem;
    bottom: 0.5rem;
    width: 1px;
    background: rgba(192, 192, 192, 0.18);
  }

  .site-nav__link {
    position: relative;
    padding: 0.85rem 0.75rem 0.85rem 1.75rem;
    font-size: 1rem;
    border-bottom: 0;
  }

  .site-nav__link::before {
    content: '';
    position: absolute;
    left: 1px;
    top: 50%;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--c-bg-alt);
    border: 2px solid var(--c-metal);
    transform: translateY(-50%) scale(0.5);
    opacity: 0;
    transition: transform 0.25s ease, opacity 0.25s ease, background 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
  }

  .site-nav__link:hover {
    color: var(--c-accent);
    background: linear-gradient(90deg, rgba(0, 212, 255, 0.08), transparent 70%);
  }

  .site-nav__link:hover::before,
  .site-nav__link[aria-current="page"]::before {
    opacity: 1;
    transform: translateY(-50%) scale(1);
  }

  .site-nav__link[aria-current="page"] {
    color: var(--c-accent);
    background: linear-gradient(90deg, rgba(0, 212, 255, 0.1), transparent 70%);
    border-bottom-color: transparent;
    text-shadow: 0 0 14px rgba(0, 212, 255, 0.3);
  }

  .site-nav__link[aria-current="page"]::before {
    background: var(--c-cta);
    border-color: var(--c-cta);
    box-shadow: 0 0 10px rgba(255, 107, 53, 0.9);
  }

  .site-header__meta {
    display: flex;
    margin-top: auto;
  }

  .scroll-progress {
    left: var(--header-w);
  }

  body[data-nav-open]::after {
    display: none;
  }
}

@media (max-width: 1023px) {
  .section {
    padding: 2.5rem 0;
  }
}

/* ---------- 动效偏好 ---------- */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}