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

/* ===========================
   CSS 变量 / 设计令牌
=========================== */
:root {
  --c-bg: #1c1726;
  --c-bg2: #231d30;
  --c-bg3: #2d2540;
  --c-primary: #6514ff;
  --c-accent: #bf00ff;
  --c-surface: #2a2040;
  --c-border: rgba(101,20,255,0.35);
  --c-text: #f0eaff;
  --c-text-muted: #9e8fc0;
  --c-text-dim: #6b5f85;
  --c-white: #ffffff;
  --c-gradient: linear-gradient(135deg, #6514ff 0%, #bf00ff 100%);
  --c-gradient-subtle: linear-gradient(135deg, rgba(101,20,255,0.18) 0%, rgba(191,0,255,0.12) 100%);
  --radius-card: 28px;
  --radius-btn: 14px;
  --radius-pill: 999px;
  --gap-sm: 16px;
  --gap-md: 24px;
  --gap-lg: 48px;
  --gap-xl: 72px;
  --content-max: 1120px;
  --aside-w: 220px;
  --font-sans: 'Noto Sans JP', 'Hiragino Sans', 'Microsoft YaHei', sans-serif;
  --font-serif: 'Noto Serif JP', 'Hiragino Mincho ProN', serif;
  --transition: 200ms cubic-bezier(0.4,0,0.2,1);
}

/* ===========================
   重置 & 基础
=========================== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  background: var(--c-bg);
  color: var(--c-text);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.7;
  min-height: 100vh;
  overflow-x: hidden;
}

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

a { color: var(--c-accent); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--c-white); }
a:focus-visible { outline: 2px solid var(--c-accent); outline-offset: 3px; border-radius: 4px; }

/* ===========================
   公告条
=========================== */
.announce-bar {
  background: var(--c-gradient);
  color: var(--c-white);
  font-size: 13px;
  font-weight: 500;
  text-align: center;
  padding: 8px var(--gap-md);
  letter-spacing: 0.04em;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* ===========================
   Header
=========================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(28,23,38,0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--c-border);
}

.header-inner {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 0 var(--gap-md);
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  font-family: var(--font-serif);
  font-size: 22px;
  font-weight: 700;
  background: var(--c-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  white-space: nowrap;
  min-height: 40px;
  display: flex;
  align-items: center;
}

.brand:hover { opacity: 0.85; }
.brand-logo { height: 36px; width: auto; }

/* 导航行 */
.header-nav {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 0 var(--gap-md) 0;
  border-top: 1px solid rgba(101,20,255,0.15);
}

.header-nav p {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 0;
  padding: 8px 0;
}

.header-nav p a {
  color: var(--c-text-muted);
  font-size: 13px;
  font-weight: 500;
  padding: 6px 14px;
  border-radius: var(--radius-pill);
  min-height: 36px;
  display: inline-flex;
  align-items: center;
  transition: background var(--transition), color var(--transition);
}

.header-nav p a:hover,
.header-nav p a[aria-current="page"] {
  background: var(--c-gradient);
  color: var(--c-white);
}

/* 汉堡按钮 */
.burger {
  background: transparent;
  border: 2px solid var(--c-border);
  border-radius: 10px;
  width: 44px;
  height: 44px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  cursor: pointer;
  padding: 0;
  transition: border-color var(--transition);
  flex-shrink: 0;
}
.burger:hover { border-color: var(--c-accent); }
.burger span {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--c-text);
  border-radius: 2px;
  transition: background var(--transition);
}
.burger:hover span { background: var(--c-accent); }

/* ===========================
   全屏遮罩菜单
=========================== */
.fullscreen-menu {
  position: fixed;
  inset: 0;
  z-index: 200;
  background: rgba(28,23,38,0.97);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--gap-lg);
  opacity: 0;
  pointer-events: none;
  transition: opacity 300ms ease;
}

.fullscreen-menu.is-open {
  opacity: 1;
  pointer-events: auto;
}

.fullscreen-menu nav {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--gap-md);
}

.fullscreen-menu nav a {
  font-family: var(--font-serif);
  font-size: clamp(18px, 3vw, 28px);
  font-weight: 600;
  color: var(--c-text);
  letter-spacing: 0.06em;
  padding: 10px 28px;
  border-radius: var(--radius-pill);
  min-height: 48px;
  display: flex;
  align-items: center;
  transition: background var(--transition), color var(--transition);
}
.fullscreen-menu nav a:hover {
  background: var(--c-gradient);
  color: var(--c-white);
}

.menu-close {
  position: absolute;
  top: 20px;
  right: 24px;
  background: transparent;
  border: 2px solid var(--c-border);
  border-radius: var(--radius-pill);
  color: var(--c-text);
  font-size: 20px;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: border-color var(--transition), color var(--transition);
}
.menu-close:hover { border-color: var(--c-accent); color: var(--c-accent); }

/* ===========================
   点阵背景纹理
=========================== */
.dot-grid-bg {
  position: absolute;
  inset: 0;
  background-image: radial-gradient(circle, rgba(191,0,255,0.25) 1px, transparent 1px);
  background-size: 28px 28px;
  opacity: 0.55;
  animation: drift 18s linear infinite;
  pointer-events: none;
}

@keyframes drift {
  0% { background-position: 0 0; }
  100% { background-position: 56px 56px; }
}

/* ===========================
   Hero 通用
=========================== */
.home-hero,
.channel-hero,
.tag-hero,
.about-hero {
  position: relative;
  min-height: 45vh;
  display: flex;
  align-items: center;
  overflow: hidden;
  background: var(--c-bg2);
  isolation: isolate;
}

.hero-inner {
  position: relative;
  z-index: 2;
  max-width: var(--content-max);
  width: 100%;
  margin: 0 auto;
  padding: var(--gap-xl) var(--gap-md);
  text-align: center;
}

.hero-eyebrow {
  display: inline-block;
  background: var(--c-gradient);
  color: var(--c-white);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: 4px 16px;
  border-radius: var(--radius-pill);
  margin-bottom: var(--gap-sm);
}

.home-hero h1,
.channel-hero h1,
.tag-hero h1,
.about-hero h1 {
  font-family: var(--font-serif);
  font-size: clamp(32px, 5vw, 56px);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--gap-sm);
  background: var(--c-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-lead, .hero-desc {
  font-size: clamp(15px, 2vw, 18px);
  color: var(--c-text-muted);
  max-width: 600px;
  margin: 0 auto var(--gap-md);
  line-height: 1.7;
}

.hero-cta {
  display: flex;
  gap: var(--gap-sm);
  justify-content: center;
  flex-wrap: wrap;
  margin-top: var(--gap-md);
}

/* 斜切底边 */
.hero-slash {
  position: absolute;
  bottom: -1px;
  left: 0;
  right: 0;
  height: 60px;
  background: var(--c-bg);
  clip-path: polygon(0 60px, 100% 0, 100% 60px);
  z-index: 3;
}

/* ===========================
   按钮
=========================== */
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--c-gradient);
  color: var(--c-white) !important;
  font-weight: 700;
  font-size: 15px;
  padding: 14px 28px;
  border-radius: var(--radius-btn);
  min-height: 48px;
  letter-spacing: 0.04em;
  transition: opacity var(--transition), transform var(--transition);
  border: none;
  cursor: pointer;
  -webkit-text-fill-color: var(--c-white);
}
.btn-primary:hover { opacity: 0.88; transform: translateY(-2px); color: var(--c-white) !important; }

.btn-ghost {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  color: var(--c-accent) !important;
  font-weight: 600;
  font-size: 15px;
  padding: 13px 26px;
  border-radius: var(--radius-btn);
  min-height: 48px;
  border: 2px solid var(--c-accent);
  letter-spacing: 0.04em;
  transition: background var(--transition), color var(--transition), transform var(--transition);
  cursor: pointer;
}
.btn-ghost:hover {
  background: var(--c-accent);
  color: var(--c-white) !important;
  transform: translateY(-2px);
}

/* ===========================
   主体区域
=========================== */
.page-main { flex: 1; }

.page-article {}

.section-inner {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: var(--gap-xl) var(--gap-md);
}

/* ===========================
   卡片：频道 / 子页 / 文章
=========================== */
.channel-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: var(--gap-lg);
  margin-top: var(--gap-lg);
}

.channel-card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  background: var(--c-surface);
  border: 2px solid var(--c-border);
  border-radius: var(--radius-card);
  padding: var(--gap-md) var(--gap-lg);
  color: var(--c-text) !important;
  transition: border-color var(--transition), transform var(--transition), background var(--transition);
}
.channel-card:hover {
  border-color: var(--c-accent);
  background: var(--c-gradient-subtle);
  transform: translateY(-4px);
}
.channel-card strong {
  font-family: var(--font-serif);
  font-size: 18px;
  font-weight: 700;
  background: var(--c-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  display: block;
}
.channel-card span {
  font-size: 13px;
  color: var(--c-text-muted);
  line-height: 1.5;
}

.children-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: var(--gap-md);
  margin-top: var(--gap-md);
}

.child-card {
  display: flex;
  flex-direction: column;
  gap: 8px;
  background: var(--c-surface);
  border: 2px solid var(--c-border);
  border-radius: var(--radius-card);
  padding: var(--gap-md);
  color: var(--c-text) !important;
  transition: border-color var(--transition), transform var(--transition);
}
.child-card:hover {
  border-color: var(--c-accent);
  transform: translateY(-3px);
}
.child-card strong {
  font-size: 16px;
  font-weight: 700;
  color: var(--c-white);
  display: block;
  line-height: 1.4;
}
.child-card span {
  font-size: 13px;
  color: var(--c-text-muted);
  line-height: 1.5;
}
.child-card time {
  font-size: 12px;
  color: var(--c-text-dim);
  margin-top: auto;
}

.article-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--gap-md);
  margin-top: var(--gap-md);
}

.article-card {
  background: var(--c-surface);
  border: 2px solid var(--c-border);
  border-radius: var(--radius-card);
  padding: var(--gap-md);
  transition: border-color var(--transition), transform var(--transition);
}
.article-card:hover { border-color: var(--c-primary); transform: translateY(-3px); }
.article-card a {
  display: block;
  margin-bottom: 8px;
}
.article-card a strong {
  font-size: 16px;
  font-weight: 700;
  color: var(--c-white);
  line-height: 1.4;
  display: block;
}
.article-card a:hover strong { color: var(--c-accent); }
.article-card p {
  font-size: 13px;
  color: var(--c-text-muted);
  line-height: 1.55;
  margin-bottom: 8px;
}
.article-card time {
  font-size: 12px;
  color: var(--c-text-dim);
}

.section-more {
  margin-top: var(--gap-lg);
  text-align: center;
}

/* ===========================
   带侧边栏的内容区
=========================== */
.content-with-aside {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: var(--gap-xl) var(--gap-md);
  display: grid;
  grid-template-columns: var(--aside-w) 1fr;
  gap: var(--gap-xl);
  align-items: start;
}

/* aside 在内容左侧 */
.page-aside {
  position: sticky;
  top: 130px;
  display: flex;
  flex-direction: column;
  gap: var(--gap-md);
}

.aside-section {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-card);
  padding: var(--gap-md);
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.aside-section h2 {
  font-family: var(--font-serif);
  font-size: 15px;
  font-weight: 700;
  color: var(--c-text);
  margin-bottom: 2px;
}

.aside-section p.subtitle {
  font-size: 12px;
  color: var(--c-text-dim);
  margin-bottom: 6px;
}

.aside-link {
  display: flex;
  align-items: center;
  min-height: 40px;
  padding: 6px 10px;
  border-radius: 12px;
  color: var(--c-text-muted) !important;
  transition: background var(--transition), color var(--transition);
}
.aside-link:hover {
  background: var(--c-gradient-subtle);
  color: var(--c-white) !important;
}
.aside-link strong {
  font-size: 13px;
  font-weight: 600;
  display: block;
  line-height: 1.4;
}

/* ===========================
   正文内容区
=========================== */
.page-content {
  min-width: 0;
}

.page-content h2,
.article-content h2 {
  font-family: var(--font-serif);
  font-size: clamp(20px, 2.5vw, 26px);
  font-weight: 700;
  color: var(--c-text);
  margin: var(--gap-lg) 0 var(--gap-sm);
  line-height: 1.3;
}

.page-content h3,
.article-content h3 {
  font-size: 19px;
  font-weight: 700;
  color: var(--c-text);
  margin: var(--gap-md) 0 10px;
}

.page-content h4,
.article-content h4 {
  font-size: 17px;
  font-weight: 600;
  color: var(--c-text-muted);
  margin: var(--gap-sm) 0 8px;
}

.page-content p,
.article-content p {
  font-size: 16px;
  line-height: 1.85;
  color: var(--c-text);
  margin-bottom: var(--gap-sm);
}

.page-content ul,
.page-content ol,
.article-content ul,
.article-content ol {
  padding-left: 24px;
  margin-bottom: var(--gap-sm);
}

.page-content li,
.article-content li {
  font-size: 16px;
  line-height: 1.75;
  color: var(--c-text);
  margin-bottom: 6px;
}

.page-content a,
.article-content a {
  color: var(--c-accent);
  border-bottom: 1px solid rgba(191,0,255,0.35);
  transition: color var(--transition), border-color var(--transition);
}
.page-content a:hover,
.article-content a:hover {
  color: var(--c-white);
  border-color: var(--c-white);
}

.page-content blockquote,
.article-content blockquote {
  border-left: 4px solid var(--c-primary);
  padding: var(--gap-sm) var(--gap-md);
  margin: var(--gap-md) 0;
  background: var(--c-bg2);
  border-radius: 0 var(--radius-card) var(--radius-card) 0;
  color: var(--c-text-muted);
  font-style: italic;
}

.page-content table,
.article-content table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: var(--gap-md);
  font-size: 14px;
}
.page-content th,
.article-content th {
  background: var(--c-bg3);
  color: var(--c-text);
  padding: 10px 14px;
  text-align: left;
  border: 1px solid var(--c-border);
  font-weight: 700;
}
.page-content td,
.article-content td {
  padding: 9px 14px;
  border: 1px solid var(--c-border);
  color: var(--c-text-muted);
}

/* ===========================
   h2 + p.subtitle 契约
=========================== */
.page-content h2 + p.subtitle,
.aside-section h2 + p.subtitle,
.section-inner h2 + p.subtitle,
.channel-children-section h2 + p.subtitle,
.tag-list-section h2 + p.subtitle,
.tag-articles-section h2 + p.subtitle {
  font-size: 14px;
  color: var(--c-text-dim);
  margin-top: -10px;
  margin-bottom: var(--gap-sm);
}

/* ===========================
   文章头部
=========================== */
.article-header-section {
  background: var(--c-bg2);
  border-bottom: 1px solid var(--c-border);
}

.article-header-inner {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: var(--gap-xl) var(--gap-md) var(--gap-lg);
}

.article-header-inner h1 {
  font-family: var(--font-serif);
  font-size: clamp(28px, 4vw, 44px);
  font-weight: 700;
  line-height: 1.25;
  margin-bottom: var(--gap-sm);
  background: var(--c-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.article-lead {
  font-size: 16px;
  color: var(--c-text-muted);
  line-height: 1.7;
}

.article-meta {
  display: flex;
  gap: var(--gap-sm);
  flex-wrap: wrap;
  margin-bottom: var(--gap-md);
}

.article-date,
.article-updated {
  font-size: 13px;
  color: var(--c-text-dim);
  background: var(--c-bg3);
  padding: 4px 12px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--c-border);
}

/* ===========================
   面包屑
=========================== */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: var(--gap-md);
  font-size: 13px;
  color: var(--c-text-dim);
}
.breadcrumb a { color: var(--c-text-muted); }
.breadcrumb a:hover { color: var(--c-accent); }
.breadcrumb span[aria-hidden] { color: var(--c-text-dim); }

/* ===========================
   Hero 紧凑版（default/about/privacy）
=========================== */
.compact-hero,
.privacy-header-section {
  background: var(--c-bg2);
  border-bottom: 1px solid var(--c-border);
  padding: 0;
}

.privacy-header-inner {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: var(--gap-xl) var(--gap-md) var(--gap-lg);
}

.privacy-header-inner h1 {
  font-family: var(--font-serif);
  font-size: clamp(28px, 4vw, 44px);
  font-weight: 700;
  background: var(--c-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.25;
  margin-bottom: var(--gap-sm);
}

.privacy-header-inner p.subtitle {
  font-size: 15px;
  color: var(--c-text-muted);
  line-height: 1.7;
  margin-bottom: var(--gap-sm);
}

/* ===========================
   About Hero
=========================== */
.about-hero h1 {
  font-family: var(--font-serif);
  font-size: clamp(30px, 4.5vw, 50px);
}

/* ===========================
   粘性锚点条
=========================== */
.sticky-anchor-bar {
  position: sticky;
  top: 110px;
  z-index: 90;
  background: var(--c-bg2);
  border-bottom: 1px solid var(--c-border);
}

.anchor-inner {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 0 var(--gap-md);
  height: 48px;
  display: flex;
  align-items: center;
  gap: var(--gap-sm);
  overflow-x: auto;
  scrollbar-width: none;
}
.anchor-inner::-webkit-scrollbar { display: none; }

.anchor-label {
  font-size: 12px;
  color: var(--c-text-dim);
  white-space: nowrap;
  flex-shrink: 0;
}

.anchor-current {
  font-size: 13px;
  font-weight: 700;
  color: var(--c-accent);
  white-space: nowrap;
  flex-shrink: 0;
  min-height: 40px;
  display: inline-flex;
  align-items: center;
}

.anchor-inner a:not(.anchor-current) {
  font-size: 13px;
  color: var(--c-text-muted);
  white-space: nowrap;
  flex-shrink: 0;
  padding: 6px 10px;
  border-radius: var(--radius-pill);
  min-height: 40px;
  display: inline-flex;
  align-items: center;
  transition: color var(--transition), background var(--transition);
}
.anchor-inner a:not(.anchor-current):hover {
  color: var(--c-white);
  background: rgba(101,20,255,0.25);
}

/* ===========================
   频道内容区节
=========================== */
.channel-children-section {
  background: var(--c-bg);
}

.channel-content-section {
  background: var(--c-bg2);
  border-top: 1px solid var(--c-border);
}

/* ===========================
   Tag 页
=========================== */
.tag-pills {
  display: flex;
  flex-wrap: wrap;
  gap: var(--gap-sm);
  margin-top: var(--gap-sm);
}

.tag-pill {
  display: inline-flex;
  align-items: center;
  padding: 8px 20px;
  border-radius: var(--radius-pill);
  background: var(--c-surface);
  border: 2px solid var(--c-border);
  color: var(--c-text-muted) !important;
  font-size: 14px;
  font-weight: 600;
  min-height: 40px;
  transition: border-color var(--transition), background var(--transition), color var(--transition);
}
.tag-pill:hover,
.tag-pill.active {
  border-color: var(--c-accent);
  background: var(--c-gradient);
  color: var(--c-white) !important;
}

.tag-list-section { background: var(--c-bg2); }
.tag-articles-section { background: var(--c-bg); }

.tag-content-prose {
  margin-top: var(--gap-xl);
  padding-top: var(--gap-lg);
  border-top: 1px solid var(--c-border);
}

/* ===========================
   Home 各区
=========================== */
.home-channels-section { background: var(--c-bg); }
.home-content-section { background: var(--c-bg2); }
.home-articles-section { background: var(--c-bg); }

.content-prose {
  max-width: 800px;
  margin: 0 auto;
}

.empty-tip {
  color: var(--c-text-dim);
  font-size: 14px;
  padding: var(--gap-md);
  text-align: center;
  grid-column: 1 / -1;
}

/* ===========================
   页脚（极简：仅 p + small）
=========================== */
.site-footer {
  background: var(--c-bg2);
  border-top: 1px solid var(--c-border);
  text-align: center;
  padding: var(--gap-xl) var(--gap-md) var(--gap-lg);
}

.footer-brand {
  font-family: var(--font-serif);
  font-size: clamp(40px, 8vw, 80px);
  font-weight: 700;
  background: var(--c-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin-bottom: var(--gap-md);
}

.site-footer small {
  display: block;
  font-size: 13px;
  color: var(--c-text-dim);
  line-height: 1.7;
}

.site-footer small a {
  color: var(--c-text-muted);
  border-bottom: 1px solid rgba(101,20,255,0.3);
  transition: color var(--transition);
}
.site-footer small a:hover { color: var(--c-accent); }

/* ===========================
   Reveal 动效
=========================== */
.reveal-section {
  opacity: 0;
  transform: translateY(32px);
  transition: opacity 400ms ease, transform 400ms ease;
}

.reveal-section.is-visible {
  opacity: 1;
  transform: none;
}

/* Stagger for child elements */
.channel-grid .channel-card,
.children-grid .child-card,
.article-grid .article-card {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 300ms ease, transform 300ms ease, border-color var(--transition), background var(--transition);
}

.is-visible .channel-grid .channel-card,
.is-visible .children-grid .child-card,
.is-visible .article-grid .article-card {
  opacity: 1;
  transform: none;
}

.is-visible .channel-grid .channel-card:nth-child(1) { transition-delay: 60ms; }
.is-visible .channel-grid .channel-card:nth-child(2) { transition-delay: 120ms; }
.is-visible .channel-grid .channel-card:nth-child(3) { transition-delay: 180ms; }
.is-visible .channel-grid .channel-card:nth-child(4) { transition-delay: 240ms; }

.is-visible .children-grid .child-card:nth-child(1) { transition-delay: 60ms; }
.is-visible .children-grid .child-card:nth-child(2) { transition-delay: 120ms; }
.is-visible .children-grid .child-card:nth-child(3) { transition-delay: 180ms; }
.is-visible .children-grid .child-card:nth-child(4) { transition-delay: 240ms; }
.is-visible .children-grid .child-card:nth-child(5) { transition-delay: 300ms; }
.is-visible .children-grid .child-card:nth-child(6) { transition-delay: 360ms; }

.is-visible .article-grid .article-card:nth-child(1) { transition-delay: 60ms; }
.is-visible .article-grid .article-card:nth-child(2) { transition-delay: 120ms; }
.is-visible .article-grid .article-card:nth-child(3) { transition-delay: 180ms; }
.is-visible .article-grid .article-card:nth-child(4) { transition-delay: 240ms; }
.is-visible .article-grid .article-card:nth-child(5) { transition-delay: 300ms; }
.is-visible .article-grid .article-card:nth-child(6) { transition-delay: 360ms; }

@media (prefers-reduced-motion: reduce) {
  .reveal-section,
  .channel-grid .channel-card,
  .children-grid .child-card,
  .article-grid .article-card,
  .dot-grid-bg {
    animation: none !important;
    transition: none !important;
    opacity: 1 !important;
    transform: none !important;
  }
}

/* ===========================
   响应式
=========================== */
@media (max-width: 768px) {
  :root {
    --gap-lg: 32px;
    --gap-xl: 48px;
  }

  .header-nav p { gap: 2px; }
  .header-nav p a { font-size: 12px; padding: 5px 10px; }

  .content-with-aside {
    grid-template-columns: 1fr;
    gap: var(--gap-lg);
    padding: var(--gap-lg) var(--gap-md);
  }

  /* aside 在内容上方（小屏时在顶部） */
  .page-aside {
    position: static;
    flex-direction: row;
    flex-wrap: wrap;
    gap: var(--gap-sm);
  }

  .aside-section {
    flex: 1 1 200px;
  }

  .channel-grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--gap-md);
  }

  .children-grid,
  .article-grid {
    grid-template-columns: 1fr;
  }

  .home-hero,
  .channel-hero,
  .tag-hero,
  .about-hero {
    min-height: auto;
  }

  .hero-inner {
    padding: var(--gap-xl) var(--gap-sm) var(--gap-lg);
  }

  .hero-cta {
    flex-direction: column;
    align-items: stretch;
  }

  .btn-primary,
  .btn-ghost {
    width: 100%;
    justify-content: center;
  }

  .sticky-anchor-bar {
    top: 100px;
  }

  .footer-brand {
    font-size: clamp(36px, 12vw, 60px);
  }

  .fullscreen-menu nav a {
    font-size: 20px;
    min-height: 52px;
    width: 100%;
    justify-content: center;
  }
}

@media (max-width: 480px) {
  .channel-grid {
    grid-template-columns: 1fr;
  }

  .announce-bar {
    font-size: 11px;
    padding: 6px var(--gap-sm);
  }

  .article-header-inner,
  .privacy-header-inner {
    padding: var(--gap-lg) var(--gap-sm);
  }

  .section-inner {
    padding: var(--gap-lg) var(--gap-sm);
  }
}