@import url('https://fonts.googleapis.com/css2?family=Atkinson+Hyperlegible:wght@400;700&family=Crimson+Pro:wght@400;500;600;700&display=swap');

/* ===================== 设计令牌 ===================== */
:root {
  --c-primary: #ff0080;
  --c-secondary: #ff00ff;
  --c-ink: #26171f;
  --c-ink-light: #4a2e3a;
  --c-surface: #0d0008;
  --c-surface-mid: #1a0514;
  --c-surface-card: rgba(38, 10, 30, 0.82);
  --c-border: rgba(255, 0, 128, 0.22);
  --c-text: #f5e6f0;
  --c-text-muted: #c9a0b8;
  --c-accent-glow: rgba(255, 0, 255, 0.35);
  --radius-card: 18px;
  --radius-btn: 10px;
  --font-head: 'Crimson Pro', 'Georgia', serif;
  --font-body: 'Atkinson Hyperlegible', 'Helvetica Neue', Arial, sans-serif;
  --nav-h: 56px;
  --shadow-card: 0 4px 32px rgba(255, 0, 128, 0.12), 0 1px 6px rgba(0,0,0,0.45);
  --shadow-card-hover: 0 8px 48px rgba(255, 0, 255, 0.22), 0 2px 12px rgba(0,0,0,0.6);
  --transition-base: 0.22s cubic-bezier(0.4,0,0.2,1);
}

/* ===================== 重置 ===================== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; scroll-behavior: smooth; }
body {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.7;
  color: var(--c-text);
  background-color: var(--c-surface);
  min-height: 100vh;
  padding-bottom: calc(var(--nav-h) + 24px);
  overflow-x: hidden;
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--c-primary); text-decoration: none; transition: color var(--transition-base), opacity var(--transition-base); }
a:hover, a:focus-visible { color: var(--c-secondary); text-decoration: underline; }
a:focus-visible { outline: 2px solid var(--c-secondary); outline-offset: 3px; }
ul, ol { list-style: none; }
h1, h2, h3, h4 { font-family: var(--font-head); line-height: 1.25; }

/* ===================== 极光背景 ===================== */
.aurora-bg {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  overflow: hidden;
}
.aurora-layer {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  mix-blend-mode: screen;
  opacity: 0.55;
}
.aurora-layer.a1 {
  width: 80vw; height: 60vh;
  top: -20%; left: -20%;
  background: radial-gradient(ellipse at 40% 50%, #ff0080 0%, transparent 70%);
  animation: aurora-drift-1 18s ease-in-out infinite alternate;
}
.aurora-layer.a2 {
  width: 70vw; height: 70vh;
  top: 10%; right: -25%;
  background: radial-gradient(ellipse at 60% 40%, #ff00ff 0%, transparent 65%);
  animation: aurora-drift-2 22s ease-in-out infinite alternate;
}
.aurora-layer.a3 {
  width: 60vw; height: 80vh;
  bottom: -30%; left: 20%;
  background: radial-gradient(ellipse at 50% 60%, rgba(255,0,128,0.6) 0%, rgba(255,0,255,0.3) 40%, transparent 70%);
  animation: aurora-drift-3 26s ease-in-out infinite alternate;
}
@keyframes aurora-drift-1 {
  0%   { transform: translate(0,0) scale(1); filter: blur(80px) hue-rotate(0deg); }
  100% { transform: translate(8vw, 6vh) scale(1.15); filter: blur(100px) hue-rotate(30deg); }
}
@keyframes aurora-drift-2 {
  0%   { transform: translate(0,0) scale(1); filter: blur(80px) hue-rotate(0deg); }
  100% { transform: translate(-6vw, 8vh) scale(1.1); filter: blur(90px) hue-rotate(-20deg); }
}
@keyframes aurora-drift-3 {
  0%   { transform: translate(0,0) scale(1); filter: blur(80px) hue-rotate(0deg); }
  100% { transform: translate(5vw, -5vh) scale(1.2); filter: blur(110px) hue-rotate(15deg); }
}
@media (prefers-reduced-motion: reduce) {
  .aurora-layer { animation: none !important; }
}

/* ===================== 点阵底纹 ===================== */
.hero-grid-bg {
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(circle, rgba(255,0,128,0.25) 1px, transparent 1px);
  background-size: 28px 28px;
  pointer-events: none;
  z-index: 1;
}

/* ===================== 导航（底部固定条） ===================== */
.site-header {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(13, 0, 8, 0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-top: 1px solid var(--c-border);
  box-shadow: 0 -4px 32px rgba(255,0,128,0.12);
}
.main-nav {
  max-width: 1280px;
  margin: 0 auto;
  height: var(--nav-h);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow-x: auto;
  scrollbar-width: none;
}
.main-nav::-webkit-scrollbar { display: none; }
.main-nav > p {
  display: flex;
  align-items: center;
  gap: 0;
  flex-wrap: nowrap;
  white-space: nowrap;
}
.main-nav > p > a {
  display: inline-flex;
  align-items: center;
  height: 44px;
  padding: 0 14px;
  font-size: 0.82rem;
  font-family: var(--font-body);
  font-weight: 700;
  color: var(--c-text-muted);
  letter-spacing: 0.02em;
  border-right: 1px solid var(--c-border);
  transition: color var(--transition-base), background var(--transition-base);
}
.main-nav > p > a:first-child { border-left: 1px solid var(--c-border); }
.main-nav > p > a:hover,
.main-nav > p > a:focus-visible,
.main-nav > p > a[aria-current="page"] {
  color: var(--c-primary);
  background: rgba(255,0,128,0.1);
  text-decoration: none;
}

/* ===================== 主内容包裹 ===================== */
.home-main,
.topic-main,
.article-main,
.about-main,
.privacy-main {
  position: relative;
  z-index: 1;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* ===================== 带侧边栏布局 ===================== */
.content-with-aside {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 40px;
  padding-top: 48px;
}

/* ===================== 侧边栏 ===================== */
.topic-aside,
.article-aside,
.about-aside,
.privacy-aside {
  position: sticky;
  top: 24px;
  align-self: start;
  background: var(--c-surface-card);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-card);
  padding: 24px 18px;
  backdrop-filter: blur(12px);
}
.topic-aside h3,
.article-aside h3,
.about-aside h3,
.privacy-aside h3 {
  font-family: var(--font-head);
  font-size: 1rem;
  color: var(--c-primary);
  margin-bottom: 14px;
  letter-spacing: 0.04em;
}
.aside-links { display: flex; flex-direction: column; gap: 6px; }
.aside-links li a {
  display: block;
  padding: 7px 10px;
  border-radius: 8px;
  font-size: 0.88rem;
  color: var(--c-text-muted);
  transition: color var(--transition-base), background var(--transition-base);
}
.aside-links li a:hover { color: var(--c-primary); background: rgba(255,0,128,0.1); text-decoration: none; }
.aside-home-link {
  display: inline-block;
  margin-top: 16px;
  font-size: 0.82rem;
  color: var(--c-text-muted);
  padding: 6px 10px;
}
.aside-home-link:hover { color: var(--c-primary); }

/* ===================== Hero（首页） ===================== */
.hero-section {
  position: relative;
  min-height: 45vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  border-radius: 0 0 var(--radius-card) var(--radius-card);
  margin-bottom: 60px;
}
.hero-content {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  align-items: center;
  width: 100%;
  padding: 48px 0 40px;
}
.hero-images {
  position: relative;
  height: 280px;
}
.hero-img { position: absolute; border-radius: 14px; object-fit: cover; box-shadow: 0 8px 40px rgba(255,0,128,0.25); }
.hero-img.hero-img-a { width: 68%; height: 85%; top: 0; left: 0; z-index: 2; }
.hero-img.hero-img-b { width: 60%; height: 75%; bottom: 0; right: 0; z-index: 1; border: 2px solid var(--c-border); }
.hero-text { display: flex; flex-direction: column; gap: 16px; }
.hero-eyebrow {
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  color: var(--c-primary);
  text-transform: uppercase;
}
.hero-h1 {
  font-size: clamp(1.8rem, 4vw, 3rem);
  font-weight: 700;
  color: #fff;
  line-height: 1.2;
}
.hero-desc {
  font-size: 1rem;
  color: var(--c-text-muted);
  max-width: 420px;
  line-height: 1.65;
}

/* ===================== 按钮 ===================== */
.btn-primary {
  display: inline-flex;
  align-items: center;
  height: 44px;
  padding: 0 26px;
  border-radius: var(--radius-btn);
  background: linear-gradient(135deg, var(--c-primary), var(--c-secondary));
  color: #fff !important;
  font-weight: 700;
  font-size: 0.92rem;
  letter-spacing: 0.04em;
  transition: opacity var(--transition-base), transform var(--transition-base), box-shadow var(--transition-base);
  box-shadow: 0 4px 20px rgba(255,0,128,0.35);
  text-decoration: none !important;
  width: fit-content;
}
.btn-primary:hover { opacity: 0.88; transform: translateY(-2px); box-shadow: 0 8px 32px rgba(255,0,255,0.4); }
.btn-outline {
  display: inline-flex;
  align-items: center;
  height: 42px;
  padding: 0 22px;
  border-radius: var(--radius-btn);
  border: 1.5px solid var(--c-primary);
  color: var(--c-primary) !important;
  font-weight: 700;
  font-size: 0.88rem;
  transition: background var(--transition-base), color var(--transition-base);
  text-decoration: none !important;
}
.btn-outline:hover { background: rgba(255,0,128,0.12); color: var(--c-secondary) !important; border-color: var(--c-secondary); }

/* ===================== 卡片 ===================== */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 20px;
  margin-top: 24px;
}
.card-grid-sm {
  grid-template-columns: repeat(auto-fill, minmax(210px, 1fr));
  gap: 14px;
}
.card {
  background: var(--c-surface-card);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
  transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
  backdrop-filter: blur(10px);
  overflow: hidden;
}
.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-card-hover);
  border-color: rgba(255,0,128,0.45);
}
.card-link {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 22px 20px;
  color: var(--c-text) !important;
  text-decoration: none !important;
  height: 100%;
}
.card-title {
  font-family: var(--font-head);
  font-size: 1.08rem;
  font-weight: 600;
  color: #fff;
  line-height: 1.35;
}
.card-desc {
  font-size: 0.88rem;
  color: var(--c-text-muted);
  line-height: 1.55;
  flex: 1;
}
.card-date {
  font-size: 0.78rem;
  color: rgba(200,160,180,0.65);
  letter-spacing: 0.03em;
}
.card-arrow {
  font-size: 1.1rem;
  color: var(--c-primary);
  margin-top: 6px;
  transition: transform var(--transition-base);
}
.card:hover .card-arrow { transform: translateX(4px); }
.card-sm .card-link { padding: 16px; gap: 6px; }
.card-sm .card-title { font-size: 0.96rem; }

/* ===================== 分节标题 + hr ===================== */
h2 {
  font-family: var(--font-head);
  font-size: clamp(1.3rem, 2.5vw, 1.8rem);
  font-weight: 600;
  color: #fff;
  letter-spacing: 0.01em;
}
h3 {
  font-family: var(--font-head);
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--c-text);
}
hr {
  border: none;
  height: 2px;
  background: linear-gradient(90deg, var(--c-primary), var(--c-secondary), transparent);
  margin: 10px 0 20px;
  border-radius: 2px;
}

/* ===================== 首页分节 ===================== */
.topics-section,
.articles-section,
.content-section {
  margin-bottom: 64px;
}

/* ===================== Topic 页 ===================== */
.topic-hero {
  padding: 48px 0 32px;
  border-bottom: 1px solid var(--c-border);
  margin-bottom: 36px;
}
.page-eyebrow {
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  color: var(--c-primary);
  margin-bottom: 10px;
  text-transform: uppercase;
}
.topic-hero h1 {
  font-size: clamp(1.6rem, 3.5vw, 2.6rem);
  color: #fff;
  margin-bottom: 10px;
}
.page-date {
  font-size: 0.82rem;
  color: var(--c-text-muted);
  letter-spacing: 0.03em;
}
.topic-content { margin-bottom: 48px; }
.children-section { margin-bottom: 48px; }

/* 子页列表 dl */
.child-list { margin-top: 20px; }
.child-list dt {
  margin-bottom: 4px;
}
.child-list dt > a {
  font-family: var(--font-head);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--c-primary);
  transition: color var(--transition-base);
  padding: 4px 0;
  display: inline-block;
}
.child-list dt > a:hover { color: var(--c-secondary); }
.child-list dd {
  font-size: 0.9rem;
  color: var(--c-text-muted);
  margin-left: 0;
  margin-bottom: 18px;
  line-height: 1.55;
  padding-left: 12px;
  border-left: 2px solid var(--c-border);
}
.child-list dd time {
  display: inline-block;
  margin-left: 8px;
  font-size: 0.78rem;
  color: rgba(200,160,180,0.6);
}

/* ===================== Article 页 ===================== */
.article-main { padding-top: 32px; }
.article-body { min-width: 0; }
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.82rem;
  color: var(--c-text-muted);
  margin-bottom: 20px;
  flex-wrap: wrap;
}
.breadcrumb a { color: var(--c-text-muted); }
.breadcrumb a:hover { color: var(--c-primary); }
.breadcrumb span[aria-current] { color: var(--c-text); }
.article-head { padding: 32px 0 24px; border-bottom: 1px solid var(--c-border); margin-bottom: 32px; }
.article-head h1 {
  font-size: clamp(1.5rem, 3vw, 2.4rem);
  color: #fff;
  margin-bottom: 12px;
}
.article-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.82rem;
  color: var(--c-text-muted);
}
.meta-sep { opacity: 0.5; }
.article-hero-wrap {
  margin-bottom: 24px;
  border-radius: 12px;
  overflow: hidden;
}
.article-hero-img { width: 100%; max-height: 340px; object-fit: cover; }
.article-content { margin-bottom: 48px; }
.article-footer-nav { margin-top: 48px; }
.related-links { display: flex; gap: 14px; flex-wrap: wrap; margin-top: 18px; }

/* ===================== About 页 ===================== */
.about-article { min-width: 0; }
.about-head { padding: 40px 0 28px; border-bottom: 1px solid var(--c-border); margin-bottom: 32px; }
.about-head h1 { font-size: clamp(1.5rem, 3vw, 2.4rem); color: #fff; margin-bottom: 10px; }
.about-content { margin-bottom: 48px; }
.about-stats { margin-bottom: 48px; }
.stats-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 20px;
}
.stat-item {
  background: var(--c-surface-card);
  border: 1px solid var(--c-border);
  border-radius: 14px;
  padding: 20px;
  text-align: center;
}
.stat-num {
  display: block;
  font-family: var(--font-head);
  font-size: 2rem;
  font-weight: 700;
  color: var(--c-primary);
  line-height: 1.2;
}
.stat-label {
  font-size: 0.82rem;
  color: var(--c-text-muted);
  letter-spacing: 0.05em;
}

/* ===================== Privacy 页 ===================== */
.privacy-article { min-width: 0; }
.privacy-head { padding: 40px 0 28px; border-bottom: 1px solid var(--c-border); margin-bottom: 32px; }
.privacy-head h1 { font-size: clamp(1.4rem, 3vw, 2.2rem); color: #fff; margin-bottom: 12px; }
.privacy-head time { display: block; font-size: 0.82rem; color: var(--c-text-muted); margin-bottom: 4px; }
.privacy-summary {
  background: rgba(255,0,128,0.08);
  border-left: 3px solid var(--c-primary);
  border-radius: 0 10px 10px 0;
  padding: 14px 18px;
  margin-bottom: 28px;
  font-size: 0.95rem;
  color: var(--c-text);
}
.privacy-content { margin-bottom: 48px; }

/* ===================== Prose 正文 ===================== */
.prose {
  font-size: 1rem;
  line-height: 1.8;
  color: var(--c-text);
  max-width: 740px;
}
.prose h2 { font-size: 1.4rem; margin-top: 2.2em; margin-bottom: 0.4em; }
.prose h3 { font-size: 1.15rem; margin-top: 1.8em; margin-bottom: 0.35em; color: var(--c-text); }
.prose p { margin-bottom: 1.1em; }
.prose ul, .prose ol { margin: 0.8em 0 1em 1.5em; }
.prose ul { list-style: disc; }
.prose ol { list-style: decimal; }
.prose li { margin-bottom: 0.4em; }
.prose a { color: var(--c-primary); border-bottom: 1px solid rgba(255,0,128,0.3); }
.prose a:hover { color: var(--c-secondary); border-color: var(--c-secondary); }
.prose strong { color: #fff; font-weight: 700; }
.prose blockquote {
  border-left: 3px solid var(--c-primary);
  margin-left: 0;
  padding: 10px 18px;
  color: var(--c-text-muted);
  background: rgba(255,0,128,0.06);
  border-radius: 0 8px 8px 0;
  margin-bottom: 1.2em;
}
.prose code {
  font-family: 'Courier New', monospace;
  background: rgba(255,0,128,0.1);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.9em;
}
.prose pre { background: rgba(0,0,0,0.5); padding: 16px; border-radius: 10px; overflow-x: auto; margin-bottom: 1.2em; }
.prose hr { margin: 2em 0; }

/* ===================== 页脚 ===================== */
.site-footer {
  position: relative;
  z-index: 1;
  margin-top: 80px;
  border-top: 1px solid var(--c-border);
  background: rgba(13,0,8,0.95);
  padding: 0 20px 80px;
  backdrop-filter: blur(12px);
}
.footer-brand {
  font-family: var(--font-head);
  font-size: clamp(2.5rem, 6vw, 5rem);
  font-weight: 700;
  color: transparent;
  background: linear-gradient(135deg, var(--c-primary), var(--c-secondary));
  -webkit-background-clip: text;
  background-clip: text;
  padding: 32px 0 20px;
  letter-spacing: -0.02em;
  line-height: 1;
}
.footer-cols {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  padding: 24px 0;
  border-top: 1px solid var(--c-border);
  border-bottom: 1px solid var(--c-border);
}
.footer-dl dt { margin-bottom: 4px; }
.footer-dl dt > a {
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--c-text);
  transition: color var(--transition-base);
}
.footer-dl dt > a:hover { color: var(--c-primary); text-decoration: none; }
.footer-dl dd {
  font-size: 0.78rem;
  color: var(--c-text-muted);
  margin-left: 0;
  margin-bottom: 12px;
  line-height: 1.4;
}
.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 16px;
  font-size: 0.8rem;
  color: var(--c-text-muted);
  flex-wrap: wrap;
  gap: 8px;
}
.footer-links { display: flex; gap: 16px; }
.footer-links a { color: var(--c-text-muted); font-size: 0.8rem; }
.footer-links a:hover { color: var(--c-primary); }

/* ===================== Scroll Reveal ===================== */
.reveal { opacity: 0; transform: translateY(20px); transition: opacity 0.5s ease, transform 0.5s ease; }
.reveal.visible { opacity: 1; transform: translateY(0); }
.reveal-section { opacity: 0; transform: translateY(16px); transition: opacity 0.5s ease 0.1s, transform 0.5s ease 0.1s; }
.reveal-section.visible { opacity: 1; transform: translateY(0); }
@media (prefers-reduced-motion: reduce) {
  .reveal, .reveal-section { opacity: 1 !important; transform: none !important; transition: none !important; }
}

/* ===================== 响应式 ===================== */
@media (max-width: 900px) {
  .content-with-aside {
    grid-template-columns: 1fr;
    gap: 24px;
  }
  .topic-aside,
  .article-aside,
  .about-aside,
  .privacy-aside {
    position: static;
  }
  .hero-content { grid-template-columns: 1fr; }
  .hero-images { height: 200px; margin-bottom: 24px; }
  .footer-cols { grid-template-columns: 1fr; gap: 16px; }
  .stats-grid { grid-template-columns: 1fr 1fr 1fr; gap: 12px; }
}

@media (max-width: 600px) {
  body { font-size: 1rem; }
  .home-main, .topic-main, .article-main, .about-main, .privacy-main { padding: 0 14px; }
  .content-with-aside { padding-top: 24px; }
  .hero-section { min-height: 40vh; }
  .hero-images { display: none; }
  .hero-content { grid-template-columns: 1fr; gap: 16px; padding: 32px 0 24px; }
  .hero-h1 { font-size: 1.6rem; }
  .card-grid { grid-template-columns: 1fr; }
  .card-grid-sm { grid-template-columns: 1fr 1fr; }
  .stats-grid { grid-template-columns: 1fr; }
  .footer-cols { grid-template-columns: 1fr; }
  .footer-brand { font-size: 2.2rem; }
  .main-nav > p > a { padding: 0 10px; font-size: 0.75rem; }
  .related-links { flex-direction: column; }
  .footer-bottom { flex-direction: column; align-items: flex-start; }
}

@media (max-width: 380px) {
  .card-grid-sm { grid-template-columns: 1fr; }
}