@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Sans:wght@300;400;500;600;700&family=JetBrains+Mono:wght@400;500;600;700&display=swap');

/* ===== CSS 变量 ===== */
:root {
  --c-primary: #6514ff;
  --c-accent: #bf00ff;
  --c-dark: #1c1726;
  --c-primary-light: #8a45ff;
  --c-accent-light: #d94dff;
  --c-bg: #0e0b18;
  --c-bg2: #16112a;
  --c-bg3: #1f1838;
  --c-text: #f0ecff;
  --c-text-muted: #b0a8d4;
  --c-border: #3a2d6a;
  --c-white: #ffffff;
  --font-mono: 'JetBrains Mono', 'Courier New', monospace;
  --font-sans: 'IBM Plex Sans', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --nav-h: 56px;
  --brand-h: 64px;
  --header-h: 120px;
  --radius: 0;
  --gap-sm: 16px;
  --gap-md: 32px;
  --gap-lg: 48px;
  --gap-xl: 80px;
  --max-w: 1200px;
  --transition: 200ms ease;
}

/* ===== 重置 ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  background: var(--c-bg);
  color: var(--c-text);
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.7;
  overflow-x: hidden;
}
img { display: block; max-width: 100%; height: auto; }
a { color: var(--c-accent-light); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--c-white); }
ul, ol { list-style: none; }
button { cursor: pointer; border: none; background: none; font: inherit; }

/* ===== 动态背景网格 ===== */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(rgba(101, 20, 255, 0.07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(101, 20, 255, 0.07) 1px, transparent 1px);
  background-size: 48px 48px;
  pointer-events: none;
  z-index: 0;
  animation: gridMove 20s linear infinite;
}
@keyframes gridMove {
  0% { background-position: 0 0, 0 0; }
  100% { background-position: 48px 48px, 48px 48px; }
}
@media (prefers-reduced-motion: reduce) {
  body::before { animation: none; }
}

/* ===== Header ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--c-dark);
  border-bottom: 2px solid var(--c-primary);
}
.brand-bar {
  background: var(--c-primary);
  height: var(--brand-h);
}
.brand-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 var(--gap-md);
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--c-white);
  text-decoration: none;
}
.brand-logo:hover { color: var(--c-white); opacity: 0.9; }
.logo-mark { width: 36px; height: 36px; object-fit: contain; }
.brand-name {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 22px;
  letter-spacing: -0.02em;
  color: var(--c-white);
}

/* 汉堡按钮 */
.menu-toggle {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--c-white);
  border: 2px solid rgba(255,255,255,0.4);
  transition: border-color var(--transition), background var(--transition);
}
.menu-toggle:hover { border-color: var(--c-white); background: rgba(255,255,255,0.1); }
.menu-icon {
  display: block;
  width: 22px;
  height: 2px;
  background: currentColor;
  position: relative;
}
.menu-icon::before, .menu-icon::after {
  content: '';
  position: absolute;
  left: 0;
  width: 100%;
  height: 2px;
  background: currentColor;
  transition: transform var(--transition);
}
.menu-icon::before { top: -7px; }
.menu-icon::after { top: 7px; }
.menu-toggle[aria-expanded="true"] .menu-icon { background: transparent; }
.menu-toggle[aria-expanded="true"] .menu-icon::before { transform: rotate(45deg) translate(5px, 5px); }
.menu-toggle[aria-expanded="true"] .menu-icon::after { transform: rotate(-45deg) translate(5px, -5px); }

/* 主导航条 */
.main-nav {
  background: var(--c-bg2);
  border-bottom: 1px solid var(--c-border);
  height: var(--nav-h);
  overflow-x: auto;
  -ms-overflow-style: none;
  scrollbar-width: none;
}
.main-nav::-webkit-scrollbar { display: none; }
.nav-links {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 var(--gap-md);
  height: 100%;
  display: flex;
  align-items: center;
  gap: var(--gap-md);
  white-space: nowrap;
}
.nav-links a {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 500;
  color: var(--c-text-muted);
  letter-spacing: 0.03em;
  padding: 10px 0;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  border-bottom: 2px solid transparent;
  transition: color var(--transition), border-color var(--transition);
  flex-shrink: 0;
}
.nav-links a:hover {
  color: var(--c-accent-light);
  border-bottom-color: var(--c-accent);
}

/* ===== 全屏遮罩菜单 ===== */
.fullscreen-nav {
  position: fixed;
  inset: 0;
  background: var(--c-dark);
  z-index: 200;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: flex-start;
  padding: var(--gap-xl);
  opacity: 0;
  pointer-events: none;
  transition: opacity 250ms ease;
}
.fullscreen-nav.is-open {
  opacity: 1;
  pointer-events: all;
}
.fullscreen-nav::before {
  content: '';
  position: absolute;
  top: 0; right: 0;
  width: 50%;
  height: 100%;
  background: linear-gradient(135deg, var(--c-primary) 0%, var(--c-accent) 100%);
  opacity: 0.12;
  clip-path: polygon(20% 0%, 100% 0%, 100% 100%, 0% 100%);
}
.fullscreen-nav__close {
  position: absolute;
  top: 24px;
  right: 32px;
  font-size: 32px;
  color: var(--c-white);
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 2px solid var(--c-border);
  transition: border-color var(--transition), color var(--transition);
}
.fullscreen-nav__close:hover { border-color: var(--c-accent); color: var(--c-accent-light); }
.fullscreen-nav__inner {
  display: flex;
  flex-direction: column;
  gap: var(--gap-sm);
  position: relative;
  z-index: 1;
}
.fn-link {
  font-family: var(--font-mono);
  font-size: clamp(18px, 2.5vw, 28px);
  font-weight: 700;
  color: var(--c-text);
  letter-spacing: -0.02em;
  padding: 12px 0;
  min-height: 48px;
  display: block;
  border-left: 4px solid transparent;
  padding-left: 20px;
  transition: color var(--transition), border-color var(--transition), padding-left var(--transition);
  opacity: 0;
  transform: translateX(-20px);
}
.fullscreen-nav.is-open .fn-link {
  animation: fnLinkIn 300ms ease forwards;
  animation-delay: calc(var(--i, 0) * 60ms);
}
.fn-link:hover {
  color: var(--c-accent-light);
  border-left-color: var(--c-accent);
  padding-left: 28px;
}
@keyframes fnLinkIn {
  to { opacity: 1; transform: translateX(0); }
}
@media (prefers-reduced-motion: reduce) {
  .fn-link { animation: none; opacity: 1; transform: none; }
  .fullscreen-nav { transition: none; }
}

/* ===== 主内容 ===== */
.page-main { position: relative; z-index: 1; min-height: 60vh; }

/* ===== Hero（首页）===== */
.hero-section {
  min-height: 70vh;
  display: grid;
  grid-template-columns: 1fr 1fr;
  grid-template-rows: auto auto;
  grid-template-areas:
    "text figure"
    "aside figure";
  gap: var(--gap-lg);
  padding: var(--gap-xl) var(--gap-md);
  max-width: var(--max-w);
  margin: 0 auto;
  align-items: start;
  position: relative;
}
.hero-text {
  grid-area: text;
  display: flex;
  flex-direction: column;
  gap: var(--gap-md);
}
.hero-badge {
  display: inline-block;
  background: var(--c-accent);
  color: var(--c-white);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.1em;
  padding: 6px 14px;
  text-transform: uppercase;
  align-self: flex-start;
}
.hero-h1 {
  font-family: var(--font-mono);
  font-size: clamp(32px, 4vw, 56px);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.03em;
  color: var(--c-white);
}
.hero-desc {
  font-size: 18px;
  color: var(--c-text-muted);
  max-width: 520px;
  line-height: 1.7;
}
.hero-cta {
  display: inline-block;
  background: var(--c-primary);
  color: var(--c-white);
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 600;
  padding: 14px 32px;
  min-height: 48px;
  align-self: flex-start;
  border: 2px solid var(--c-primary);
  transition: background var(--transition), color var(--transition), border-color var(--transition);
}
.hero-cta:hover {
  background: transparent;
  color: var(--c-primary-light);
  border-color: var(--c-primary-light);
}
.hero-figure {
  grid-area: figure;
  margin: 0;
  overflow: hidden;
  position: relative;
}
.hero-img { width: 100%; height: 100%; object-fit: cover; }
.hero-figure--placeholder { background: var(--c-bg3); min-height: 400px; }
.hero-geo {
  width: 100%;
  height: 100%;
  min-height: 400px;
  background: linear-gradient(135deg, var(--c-primary) 0%, var(--c-accent) 50%, var(--c-bg3) 100%);
  position: relative;
  overflow: hidden;
}
.hero-geo::before {
  content: '';
  position: absolute;
  top: 20%;
  left: 20%;
  width: 60%;
  height: 60%;
  border: 4px solid rgba(255,255,255,0.2);
  transform: rotate(30deg);
  animation: geoRotate 12s linear infinite;
}
@keyframes geoRotate {
  to { transform: rotate(390deg); }
}
@media (prefers-reduced-motion: reduce) {
  .hero-geo::before { animation: none; }
}
.hero-aside {
  grid-area: aside;
}
.hero-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2px;
  background: var(--c-border);
}
.hero-stats dt {
  background: var(--c-bg2);
  padding: 12px 16px 4px;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--c-text-muted);
  letter-spacing: 0.08em;
}
.hero-stats dd {
  background: var(--c-bg2);
  padding: 4px 16px 14px;
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 700;
  color: var(--c-accent-light);
}

/* ===== 内容区（首页通用 section）===== */
.content-section {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: var(--gap-lg);
  padding: var(--gap-xl) var(--gap-md);
  max-width: var(--max-w);
  margin: 0 auto;
}
.content-aside {
  position: sticky;
  top: calc(var(--header-h) + 24px);
  height: fit-content;
}
.content-body { min-width: 0; }

/* ===== Aside / Sidebar 通用 ===== */
.aside-title, .sidebar-title, .aside-mini-title {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--c-primary-light);
  text-transform: uppercase;
  margin-bottom: 8px;
}
.aside-nav { display: flex; flex-direction: column; gap: 4px; }
.aside-nav li a, .sidebar-nav-links a {
  display: block;
  padding: 8px 12px;
  font-size: 14px;
  color: var(--c-text-muted);
  border-left: 3px solid transparent;
  transition: color var(--transition), border-color var(--transition), background var(--transition);
  min-height: 40px;
  line-height: 1.4;
  display: flex;
  align-items: center;
}
.aside-nav li a:hover, .sidebar-nav-links a:hover {
  color: var(--c-white);
  border-left-color: var(--c-accent);
  background: rgba(101, 20, 255, 0.12);
}
.sidebar-nav-links {
  display: flex;
  flex-direction: column;
  gap: 2px;
  margin-bottom: var(--gap-md);
}
.aside-desc { font-size: 14px; color: var(--c-text-muted); line-height: 1.6; }

/* hr 装饰 */
hr {
  border: none;
  border-top: 2px solid var(--c-primary);
  margin: 10px 0 16px;
}

/* ===== 文章列表 section（首页）===== */
.articles-section {
  padding: var(--gap-xl) var(--gap-md);
  max-width: var(--max-w);
  margin: 0 auto;
}
.section-title {
  font-family: var(--font-mono);
  font-size: clamp(28px, 3vw, 40px);
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--c-white);
  margin-bottom: 8px;
}

/* 卡片 */
.card {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 0;
  background: var(--c-bg2);
  overflow: hidden;
  opacity: 0;
  transform: translateY(24px);
  margin-bottom: 2px;
  transition: transform var(--transition), box-shadow var(--transition);
}
.card.is-visible {
  animation: cardIn 400ms ease forwards;
  animation-delay: calc(var(--stagger, 0) * 80ms);
}
@keyframes cardIn {
  to { opacity: 1; transform: translateY(0); }
}
@media (prefers-reduced-motion: reduce) {
  .card { animation: none; opacity: 1; transform: none; }
}
.card:hover { transform: translateY(-2px); box-shadow: 0 8px 32px rgba(101,20,255,0.3); }
.card--accent { border-left: 4px solid var(--c-primary); }
.card--purple { border-left: 4px solid var(--c-accent); }
.card--dark { border-left: 4px solid var(--c-text-muted); }
.card-figure { margin: 0; overflow: hidden; height: 100%; min-height: 160px; }
.card-figure .card-thumb { width: 100%; height: 100%; object-fit: cover; min-height: 160px; }
.card-body { padding: var(--gap-md); display: flex; flex-direction: column; gap: 10px; }
.card-date {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--c-accent-light);
  letter-spacing: 0.08em;
}
.card-title { font-size: 18px; font-weight: 600; line-height: 1.35; }
.card-title a { color: var(--c-white); }
.card-title a:hover { color: var(--c-accent-light); }
.card-desc { font-size: 14px; color: var(--c-text-muted); line-height: 1.6; flex: 1; }
.card-link {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--c-primary-light);
  letter-spacing: 0.05em;
  align-self: flex-start;
  border-bottom: 1px solid var(--c-primary);
  padding-bottom: 2px;
  min-height: 24px;
  display: inline-flex;
  align-items: center;
}
.card-link:hover { color: var(--c-accent-light); border-bottom-color: var(--c-accent); }

/* ===== page-content 正文排版 ===== */
.page-content {
  font-size: 17px;
  line-height: 1.8;
  color: var(--c-text);
}
.page-content h2 {
  font-family: var(--font-mono);
  font-size: clamp(22px, 2.5vw, 30px);
  font-weight: 700;
  color: var(--c-white);
  margin: var(--gap-lg) 0 8px;
  letter-spacing: -0.02em;
}
.page-content h2 + hr { margin-top: 0; }
.page-content h3 {
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 600;
  color: var(--c-text);
  margin: var(--gap-md) 0 6px;
}
.page-content h3 + hr { margin-top: 0; }
.page-content p { margin-bottom: 1.2em; }
.page-content strong { color: var(--c-white); font-weight: 600; }
.page-content em { color: var(--c-accent-light); font-style: italic; }
.page-content a { color: var(--c-accent-light); border-bottom: 1px solid var(--c-accent); }
.page-content a:hover { color: var(--c-white); }
.page-content ul, .page-content ol {
  margin: 0 0 1.2em 1.5em;
  list-style: disc;
}
.page-content ol { list-style: decimal; }
.page-content li { margin-bottom: 0.5em; }
.page-content blockquote {
  border-left: 4px solid var(--c-primary);
  padding: 16px 24px;
  margin: var(--gap-md) 0;
  background: var(--c-bg2);
  color: var(--c-text-muted);
}
.page-content code {
  font-family: var(--font-mono);
  background: var(--c-bg3);
  padding: 2px 6px;
  font-size: 0.9em;
  color: var(--c-accent-light);
}
.page-content pre {
  background: var(--c-bg3);
  padding: var(--gap-md);
  overflow-x: auto;
  margin-bottom: 1.2em;
}
.page-content table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 1.2em;
  font-size: 15px;
}
.page-content th {
  background: var(--c-bg3);
  padding: 10px 16px;
  text-align: left;
  font-family: var(--font-mono);
  color: var(--c-primary-light);
  border-bottom: 2px solid var(--c-primary);
}
.page-content td {
  padding: 10px 16px;
  border-bottom: 1px solid var(--c-border);
  color: var(--c-text-muted);
}
.page-content img { max-width: 100%; margin: var(--gap-md) 0; }

/* ===== 文章页 ===== */
.page-main--article {}

.article-hero {
  background: var(--c-bg2);
  border-bottom: 2px solid var(--c-primary);
  padding: var(--gap-xl) var(--gap-md) var(--gap-lg);
  position: relative;
  overflow: hidden;
}
.article-hero::before {
  content: '';
  position: absolute;
  top: -40px; right: -40px;
  width: 280px; height: 280px;
  background: var(--c-primary);
  opacity: 0.12;
  clip-path: polygon(50% 0%, 100% 50%, 50% 100%, 0% 50%);
}
.article-hero__meta {
  max-width: var(--max-w);
  margin: 0 auto 16px;
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-mono);
  font-size: 13px;
}
.breadcrumb-link { color: var(--c-text-muted); }
.breadcrumb-link:hover { color: var(--c-accent-light); }
.breadcrumb-sep { color: var(--c-border); }
.article-type-badge {
  background: var(--c-primary);
  color: var(--c-white);
  padding: 4px 10px;
  font-size: 11px;
  letter-spacing: 0.08em;
}
.article-h1 {
  max-width: var(--max-w);
  margin: 0 auto 16px;
  font-family: var(--font-mono);
  font-size: clamp(28px, 4vw, 48px);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.03em;
  color: var(--c-white);
}
.article-meta-row {
  max-width: var(--max-w);
  margin: 0 auto 24px;
  display: flex;
  gap: var(--gap-md);
  align-items: center;
  flex-wrap: wrap;
}
.article-date, .article-modified {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--c-accent-light);
  letter-spacing: 0.06em;
}
.article-hero__figure {
  max-width: var(--max-w);
  margin: 0 auto 24px;
  overflow: hidden;
}
.article-hero-img { width: 100%; max-height: 420px; object-fit: cover; }
.article-hero__aside {
  max-width: var(--max-w);
  margin: 0 auto;
  background: var(--c-bg3);
  border-left: 4px solid var(--c-accent);
  padding: var(--gap-md);
  position: relative;
  z-index: 1;
}
.aside-mini-title { font-size: 12px; }

/* 文章正文区 */
.article-body-section {
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: var(--gap-lg);
  padding: var(--gap-xl) var(--gap-md);
  max-width: var(--max-w);
  margin: 0 auto;
  position: relative;
}
.article-deco-figure {
  position: absolute;
  top: 0; right: var(--gap-md);
  width: 280px;
  height: 200px;
  margin: 0;
  overflow: hidden;
  pointer-events: none;
  z-index: 0;
  opacity: 0.15;
}
.deco-block {
  position: absolute;
  background: var(--c-primary);
}
.deco-block--1 { width: 120px; height: 8px; top: 20px; left: 0; }
.deco-block--2 { width: 8px; height: 80px; top: 20px; left: 0; }
.article-sidebar {
  position: sticky;
  top: calc(var(--header-h) + 24px);
  height: fit-content;
  z-index: 1;
}
.sidebar-nav-block {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-top: var(--gap-md);
}
.sidebar-home-link, .sidebar-about-link {
  display: block;
  padding: 10px 14px;
  font-family: var(--font-mono);
  font-size: 13px;
  background: var(--c-bg3);
  color: var(--c-text-muted);
  border-left: 3px solid var(--c-border);
  min-height: 40px;
  display: flex;
  align-items: center;
  transition: color var(--transition), border-color var(--transition);
}
.sidebar-home-link:hover, .sidebar-about-link:hover {
  color: var(--c-white);
  border-left-color: var(--c-accent);
}
.article-content { min-width: 0; position: relative; z-index: 1; }

/* 延伸阅读 */
.related-section {
  padding: var(--gap-xl) var(--gap-md);
  max-width: var(--max-w);
  margin: 0 auto;
  border-top: 1px solid var(--c-border);
}
.rel-card {
  background: var(--c-bg2);
  padding: var(--gap-md);
  border-top: 3px solid var(--c-primary);
  opacity: 0;
  transform: translateY(16px);
  display: inline-block;
  width: calc(25% - 6px);
  margin-right: 8px;
  vertical-align: top;
}
.rel-card.is-visible {
  animation: cardIn 350ms ease forwards;
  animation-delay: calc(var(--stagger, 0) * 70ms);
}
@media (prefers-reduced-motion: reduce) {
  .rel-card { animation: none; opacity: 1; transform: none; }
}
.rel-card__title { font-size: 15px; font-weight: 600; margin-bottom: 6px; line-height: 1.4; }
.rel-card__title a { color: var(--c-white); }
.rel-card__title a:hover { color: var(--c-accent-light); }
.rel-card time { font-family: var(--font-mono); font-size: 12px; color: var(--c-text-muted); display: block; margin-bottom: 6px; }
.rel-card__desc { font-size: 13px; color: var(--c-text-muted); line-height: 1.55; }

/* ===== About 页 ===== */
.about-hero {
  background: var(--c-bg2);
  padding: var(--gap-xl) var(--gap-md);
  border-bottom: 2px solid var(--c-accent);
  position: relative;
  overflow: hidden;
  min-height: 320px;
}
.about-geo-figure {
  position: absolute;
  inset: 0;
  margin: 0;
  pointer-events: none;
}
.about-geo {
  position: absolute;
  background: linear-gradient(135deg, var(--c-primary), var(--c-accent));
  opacity: 0.15;
}
.about-geo--1 { width: 300px; height: 300px; top: -80px; right: -80px; clip-path: polygon(50% 0%, 100% 100%, 0% 100%); }
.about-geo--2 { width: 200px; height: 6px; bottom: 60px; right: 40px; }
.about-geo--3 { width: 6px; height: 120px; bottom: 60px; right: 40px; background: var(--c-accent); opacity: 0.3; }
.about-badge-aside {
  max-width: var(--max-w);
  margin: 0 auto 16px;
  display: flex;
  align-items: center;
  gap: 16px;
  position: relative;
  z-index: 1;
}
.about-badge {
  background: var(--c-accent);
  color: var(--c-white);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  padding: 5px 12px;
  letter-spacing: 0.1em;
}
.about-h1 {
  max-width: var(--max-w);
  margin: 0 auto 16px;
  font-family: var(--font-mono);
  font-size: clamp(30px, 4vw, 52px);
  font-weight: 700;
  line-height: 1.2;
  color: var(--c-white);
  position: relative;
  z-index: 1;
}
.about-lead {
  max-width: var(--max-w);
  margin: 0 auto;
  font-size: 18px;
  color: var(--c-text-muted);
  max-width: 600px;
  position: relative;
  z-index: 1;
}
.about-content-section {
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: var(--gap-lg);
  padding: var(--gap-xl) var(--gap-md);
  max-width: var(--max-w);
  margin: 0 auto;
}
.about-sidebar {
  position: sticky;
  top: calc(var(--header-h) + 24px);
  height: fit-content;
}
.about-body { min-width: 0; }
.about-links-section {
  padding: var(--gap-xl) var(--gap-md);
  max-width: var(--max-w);
  margin: 0 auto;
  border-top: 1px solid var(--c-border);
}
.sitemap-card {
  display: inline-block;
  width: calc(33.333% - 10px);
  margin: 0 8px 8px 0;
  background: var(--c-bg2);
  padding: var(--gap-md);
  vertical-align: top;
  border-top: 3px solid var(--c-primary);
  opacity: 0;
  transform: translateY(16px);
}
.sitemap-card.is-visible {
  animation: cardIn 350ms ease forwards;
  animation-delay: calc(var(--stagger, 0) * 70ms);
}
@media (prefers-reduced-motion: reduce) {
  .sitemap-card { animation: none; opacity: 1; transform: none; }
}
.sitemap-card h3 { font-size: 16px; font-weight: 600; margin-bottom: 6px; line-height: 1.35; }
.sitemap-card h3 a { color: var(--c-white); }
.sitemap-card h3 a:hover { color: var(--c-accent-light); }
.sitemap-card time { font-family: var(--font-mono); font-size: 12px; color: var(--c-text-muted); display: block; margin-bottom: 6px; }
.sitemap-card p { font-size: 13px; color: var(--c-text-muted); line-height: 1.55; }

/* ===== Privacy 页 ===== */
.privacy-header-section {
  background: var(--c-dark);
  border-bottom: 2px solid var(--c-primary);
  padding: var(--gap-xl) var(--gap-md) var(--gap-lg);
  position: relative;
  overflow: hidden;
}
.privacy-deco {
  position: absolute;
  inset: 0;
  margin: 0;
  pointer-events: none;
}
.privacy-deco__bar {
  position: absolute;
  background: var(--c-primary);
  opacity: 0.15;
}
.privacy-deco__bar--1 { height: 100%; width: 6px; left: 40%; }
.privacy-deco__bar--2 { height: 6px; width: 30%; bottom: 40px; left: 40%; }
.privacy-meta-aside {
  max-width: var(--max-w);
  margin: 0 auto 16px;
  display: flex;
  align-items: center;
  gap: 16px;
  position: relative;
  z-index: 1;
}
.privacy-badge {
  background: var(--c-bg3);
  border: 1px solid var(--c-border);
  color: var(--c-text-muted);
  font-family: var(--font-mono);
  font-size: 12px;
  padding: 5px 12px;
  letter-spacing: 0.08em;
}
.privacy-h1 {
  max-width: var(--max-w);
  margin: 0 auto;
  font-family: var(--font-mono);
  font-size: clamp(28px, 3.5vw, 44px);
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--c-white);
  position: relative;
  z-index: 1;
}
.privacy-body-section {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: var(--gap-lg);
  padding: var(--gap-xl) var(--gap-md);
  max-width: var(--max-w);
  margin: 0 auto;
}
.privacy-sidebar {
  position: sticky;
  top: calc(var(--header-h) + 24px);
  height: fit-content;
}
.privacy-content { min-width: 0; }

/* ===== Default 页 ===== */
.default-section {
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: var(--gap-lg);
  padding: var(--gap-xl) var(--gap-md);
  max-width: var(--max-w);
  margin: 0 auto;
}
.default-aside {
  position: sticky;
  top: calc(var(--header-h) + 24px);
  height: fit-content;
}
.default-body { min-width: 0; }
.default-body h1 {
  font-family: var(--font-mono);
  font-size: clamp(28px, 3.5vw, 44px);
  font-weight: 700;
  letter-spacing: -0.03em;
  margin-bottom: var(--gap-md);
  color: var(--c-white);
}

/* ===== Footer ===== */
.site-footer {
  background: var(--c-dark);
  border-top: 2px solid var(--c-primary);
  margin-top: var(--gap-xl);
  position: relative;
  z-index: 1;
}
.footer-form-block {
  background: var(--c-primary);
  padding: var(--gap-lg) var(--gap-md);
  max-width: 100%;
}
.footer-form-title {
  font-family: var(--font-mono);
  font-size: 24px;
  font-weight: 700;
  color: var(--c-white);
  margin-bottom: 8px;
}
.footer-form-desc {
  color: rgba(255,255,255,0.8);
  margin-bottom: var(--gap-md);
  font-size: 15px;
}
.footer-form {
  max-width: 600px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.footer-input, .footer-textarea {
  background: rgba(255,255,255,0.1);
  border: 1px solid rgba(255,255,255,0.3);
  color: var(--c-white);
  padding: 12px 16px;
  font-family: var(--font-sans);
  font-size: 15px;
  outline: none;
  transition: border-color var(--transition);
}
.footer-input::placeholder, .footer-textarea::placeholder { color: rgba(255,255,255,0.5); }
.footer-input:focus, .footer-textarea:focus { border-color: var(--c-white); }
.footer-textarea { resize: vertical; }
.footer-submit {
  background: var(--c-dark);
  color: var(--c-white);
  padding: 14px 32px;
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.05em;
  align-self: flex-start;
  min-height: 48px;
  border: 2px solid var(--c-dark);
  transition: background var(--transition), color var(--transition);
}
.footer-submit:hover { background: transparent; color: var(--c-dark); border-color: var(--c-dark); }

.footer-cols {
  display: flex;
  gap: 2px;
  background: var(--c-border);
  padding: 0;
  max-width: 100%;
}
.footer-dl {
  flex: 1;
  background: var(--c-bg2);
  padding: var(--gap-lg) var(--gap-md);
  min-width: 0;
}
.footer-dl dt {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--c-primary-light);
  text-transform: uppercase;
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--c-primary);
}
.footer-dl dd { margin-bottom: 8px; }
.footer-dl dd a {
  font-size: 14px;
  color: var(--c-text-muted);
  min-height: 40px;
  display: inline-flex;
  align-items: center;
  padding: 4px 0;
  transition: color var(--transition);
  line-height: 1.4;
}
.footer-dl dd a:hover { color: var(--c-accent-light); }
.footer-bottom {
  background: var(--c-bg);
  text-align: center;
  padding: 20px var(--gap-md);
  border-top: 1px solid var(--c-border);
}
.footer-bottom p {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--c-text-muted);
}

/* ===== 响应式 ===== */
@media (max-width: 900px) {
  .hero-section {
    grid-template-columns: 1fr;
    grid-template-areas:
      "text"
      "figure"
      "aside";
    min-height: auto;
    padding: var(--gap-lg) var(--gap-md);
  }
  .content-section { grid-template-columns: 1fr; }
  .content-aside { position: static; }
  .article-body-section { grid-template-columns: 1fr; }
  .article-deco-figure { display: none; }
  .article-sidebar { position: static; }
  .about-content-section { grid-template-columns: 1fr; }
  .about-sidebar { position: static; }
  .privacy-body-section { grid-template-columns: 1fr; }
  .privacy-sidebar { position: static; }
  .default-section { grid-template-columns: 1fr; }
  .default-aside { position: static; }
  .rel-card {
    width: calc(50% - 6px);
    margin-bottom: 8px;
  }
  .sitemap-card { width: calc(50% - 8px); }
  .footer-cols { flex-direction: column; gap: 0; }
  .hero-stats { grid-template-columns: repeat(3, 1fr); }
}

@media (max-width: 600px) {
  :root {
    --gap-lg: 32px;
    --gap-xl: 48px;
  }
  .brand-name { font-size: 18px; }
  .nav-links { gap: var(--gap-sm); }
  .nav-links a { font-size: 12px; }
  .card { grid-template-columns: 1fr; }
  .card-figure { min-height: 180px; }
  .card-figure .card-thumb { min-height: 180px; }
  .rel-card { width: 100%; margin-right: 0; }
  .sitemap-card { width: 100%; margin-right: 0; }
  .hero-stats { grid-template-columns: 1fr; }
  .hero-stats dt { padding-bottom: 0; }
  .hero-stats dd { padding-top: 0; border-bottom: 1px solid var(--c-border); }
  .fullscreen-nav { padding: 80px var(--gap-md) var(--gap-md); }
  .footer-form-block { padding: var(--gap-md); }
  .footer-dl { padding: var(--gap-md); }
  .articles-section, .related-section, .about-links-section {
    padding: var(--gap-lg) var(--gap-md);
  }
}

/* ===== 无障碍焦点 ===== */
a:focus-visible, button:focus-visible, input:focus-visible, textarea:focus-visible {
  outline: 2px solid var(--c-accent-light);
  outline-offset: 2px;
}

/* ===== 滚动快照（文章页分节）===== */
@media (prefers-reduced-motion: no-preference) {
  .page-main--article .article-body-section {
    scroll-margin-top: var(--header-h);
  }
}