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

/* ===== CSS 自定义属性 ===== */
:root {
  --c-primary: #56228b;
  --c-primary-light: #7a3fbf;
  --c-primary-dark: #3d1866;
  --c-brown: #8b4513;
  --c-brown-light: #b5622a;
  --c-ink: #1f1726;
  --c-ink-soft: #3a2a4a;
  --c-surface: #faf8fc;
  --c-surface-2: #f3eef9;
  --c-surface-3: #ede5f5;
  --c-border: #ddd4ec;
  --c-text: #2a1e38;
  --c-text-muted: #6b5a82;
  --c-white: #ffffff;

  --font-display: 'Bodoni Moda', 'Georgia', serif;
  --font-body: 'Jost', 'PingFang SC', 'Microsoft YaHei', sans-serif;

  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-xl: 28px;
  --radius-pill: 999px;

  --shadow-soft: 0 2px 16px rgba(86,34,139,0.08), 0 1px 4px rgba(86,34,139,0.04);
  --shadow-card: 0 4px 28px rgba(86,34,139,0.10), 0 1px 6px rgba(86,34,139,0.05);
  --shadow-hover: 0 8px 40px rgba(86,34,139,0.18), 0 2px 8px rgba(86,34,139,0.08);

  --transition-fast: 0.18s ease;
  --transition-mid: 0.28s cubic-bezier(0.34,1.56,0.64,1);

  --nav-h: 68px;
  --anchor-h: 44px;
  --container: 1160px;
  --prose-max: 720px;
}

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

/* ===== 页面包裹 ===== */
.page-wrap {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}
#main-content { flex: 1; }

/* ===== 导航头部 ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(31,23,38,0.96);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(86,34,139,0.3);
  height: var(--nav-h);
}
.header-inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
  height: 100%;
  display: flex;
  align-items: center;
  gap: 24px;
}
.brand-link {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  gap: 10px;
  min-height: 44px;
}
.nav-logo { width: auto; height: 36px; border-radius: var(--radius-sm); }
.nav-brand-text {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  color: var(--c-white);
  letter-spacing: 0.01em;
  white-space: nowrap;
}

/* 导航：header > nav > p > a */
.primary-nav {
  flex: 1;
  overflow: hidden;
}
.primary-nav p {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  align-items: center;
}
.primary-nav p a {
  display: inline-flex;
  align-items: center;
  padding: 8px 14px;
  border-radius: var(--radius-pill);
  font-size: 14px;
  font-weight: 500;
  color: rgba(255,255,255,0.78);
  border: 1px solid transparent;
  min-height: 40px;
  transition: background var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast);
  white-space: nowrap;
}
.primary-nav p a:hover,
.primary-nav p a[aria-current="page"] {
  background: rgba(86,34,139,0.5);
  color: var(--c-white);
  border-color: rgba(86,34,139,0.7);
}
.nav-cta-btn {
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  padding: 10px 20px;
  border-radius: var(--radius-pill);
  background: var(--c-primary);
  color: var(--c-white);
  font-size: 14px;
  font-weight: 600;
  min-height: 44px;
  transition: background var(--transition-fast), transform var(--transition-fast);
  white-space: nowrap;
}
.nav-cta-btn:hover {
  background: var(--c-primary-light);
  transform: translateY(-1px);
}

/* ===== 锚点条 ===== */
.anchor-strip {
  position: sticky;
  top: var(--nav-h);
  z-index: 90;
  background: var(--c-surface-2);
  border-bottom: 1px solid var(--c-border);
  height: var(--anchor-h);
}
.anchor-inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
  height: 100%;
  display: flex;
  align-items: center;
  gap: 4px;
}
.anchor-inner a {
  display: inline-flex;
  align-items: center;
  padding: 6px 14px;
  border-radius: var(--radius-pill);
  font-size: 13px;
  font-weight: 500;
  color: var(--c-text-muted);
  background: transparent;
  min-height: 40px;
  transition: background var(--transition-fast), color var(--transition-fast);
}
.anchor-inner a:hover {
  background: var(--c-surface-3);
  color: var(--c-primary);
}

/* ===== 按钮 ===== */
.btn-primary {
  display: inline-flex;
  align-items: center;
  padding: 14px 32px;
  border-radius: var(--radius-pill);
  background: var(--c-primary);
  color: var(--c-white);
  font-size: 16px;
  font-weight: 600;
  letter-spacing: 0.02em;
  min-height: 52px;
  transition: background var(--transition-fast), transform var(--transition-mid), box-shadow var(--transition-fast);
}
.btn-primary:hover {
  background: var(--c-primary-light);
  transform: translateY(-2px);
  box-shadow: var(--shadow-hover);
}
.btn-ghost {
  display: inline-flex;
  align-items: center;
  padding: 13px 30px;
  border-radius: var(--radius-pill);
  background: transparent;
  color: var(--c-white);
  font-size: 16px;
  font-weight: 500;
  border: 2px solid rgba(255,255,255,0.5);
  min-height: 52px;
  transition: border-color var(--transition-fast), background var(--transition-fast), color var(--transition-fast);
}
.btn-ghost:hover {
  border-color: var(--c-white);
  background: rgba(255,255,255,0.1);
}

/* ===== Hero ===== */
.hero-section {
  position: relative;
  min-height: calc(100vh - var(--nav-h));
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  background: var(--c-ink);
  padding: 80px 24px 60px;
}
.hero-grid-bg {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(86,34,139,0.15) 1px, transparent 1px),
    linear-gradient(90deg, rgba(86,34,139,0.15) 1px, transparent 1px);
  background-size: 48px 48px;
  pointer-events: none;
}
.hero-blob {
  position: absolute;
  top: -20%;
  right: -10%;
  width: 60%;
  height: 80%;
  background: radial-gradient(ellipse at center, rgba(86,34,139,0.35) 0%, transparent 70%);
  border-radius: 40% 60% 70% 30% / 30% 50% 50% 70%;
  pointer-events: none;
  animation: blobFloat 8s ease-in-out infinite alternate;
}
@keyframes blobFloat {
  from { transform: translate(0,0) rotate(0deg); }
  to   { transform: translate(-20px, 20px) rotate(8deg); }
}
.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  max-width: 780px;
  margin: 0 auto;
}
.hero-eyebrow {
  display: inline-block;
  padding: 6px 18px;
  border-radius: var(--radius-pill);
  background: rgba(86,34,139,0.4);
  border: 1px solid rgba(86,34,139,0.6);
  color: rgba(255,255,255,0.85);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.05em;
  margin-bottom: 24px;
}
.hero-h1 {
  font-family: var(--font-display);
  font-size: clamp(2.2rem, 5vw, 4rem);
  font-weight: 700;
  color: var(--c-white);
  line-height: 1.2;
  margin-bottom: 20px;
  letter-spacing: -0.01em;
}
.hero-desc {
  font-size: 18px;
  line-height: 1.7;
  color: rgba(255,255,255,0.75);
  margin-bottom: 36px;
  max-width: 580px;
  margin-left: auto;
  margin-right: auto;
}
.hero-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}
.hero-figure {
  position: relative;
  z-index: 1;
  margin-top: 48px;
  border-radius: var(--radius-xl);
  overflow: hidden;
  max-width: 720px;
  width: 100%;
  box-shadow: var(--shadow-card);
}
.hero-media { width: 100%; border-radius: var(--radius-xl); }

/* ===== 介绍区（首页）===== */
.intro-section {
  max-width: var(--container);
  margin: 80px auto;
  padding: 0 24px;
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 48px;
  align-items: start;
}
.intro-aside {
  background: var(--c-surface-2);
  border-radius: var(--radius-xl);
  padding: 32px 24px;
  border: 1px solid var(--c-border);
  position: sticky;
  top: calc(var(--nav-h) + 20px);
}
.aside-heading {
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 700;
  color: var(--c-primary);
  margin-bottom: 16px;
  letter-spacing: 0.02em;
}
.aside-heading span { display: inline; }
.aside-sub-heading {
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 600;
  color: var(--c-brown);
  margin: 20px 0 10px;
}
.aside-sub-heading span { display: inline; }
.aside-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.aside-list li {
  font-size: 14px;
  color: var(--c-text-muted);
  padding: 6px 10px;
  border-radius: var(--radius-sm);
  background: var(--c-surface-3);
  border-left: 3px solid var(--c-primary);
}
.aside-info {
  font-size: 14px;
  color: var(--c-text-muted);
  line-height: 1.6;
  margin-bottom: 12px;
}
.intro-body { min-width: 0; }

/* ===== 文章列表（首页卡片）===== */
.articles-section {
  background: var(--c-surface-2);
  padding: 80px 24px;
}
.articles-section .section-title,
.articles-section .section-sub {
  max-width: var(--container);
  margin-left: auto;
  margin-right: auto;
}
.articles-section .section-sub {
  color: var(--c-text-muted);
  font-size: 16px;
  margin-top: -16px;
  margin-bottom: 40px;
  text-align: center;
}
.articles-grid {
  max-width: var(--container);
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
/* 子页卡片：a > strong + span（契约：a 直接子 strong） */
.article-card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 28px 24px;
  background: var(--c-white);
  border-radius: var(--radius-xl);
  border: 1px solid var(--c-border);
  box-shadow: var(--shadow-soft);
  transition: transform var(--transition-mid), box-shadow var(--transition-fast);
  color: var(--c-text);
}
.article-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}
.article-card strong {
  display: block;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 600;
  color: var(--c-ink);
  line-height: 1.4;
}
.article-card .card-desc {
  font-size: 14px;
  color: var(--c-text-muted);
  line-height: 1.6;
  flex: 1;
}
.card-date {
  font-size: 12px;
  color: var(--c-brown);
  font-weight: 500;
}

/* ===== CTA 区 ===== */
.cta-section {
  max-width: var(--container);
  margin: 80px auto;
  padding: 0 24px;
  position: relative;
  text-align: center;
}
.cta-blob-wrap {
  position: absolute;
  inset: -40px;
  pointer-events: none;
  z-index: 0;
}
.cta-blob-svg { width: 100%; height: 100%; }
.cta-content {
  position: relative;
  z-index: 1;
  background: linear-gradient(135deg, var(--c-primary-dark) 0%, var(--c-primary) 60%, var(--c-primary-light) 100%);
  border-radius: var(--radius-xl);
  padding: 64px 48px;
  color: var(--c-white);
}
.cta-title {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 3vw, 2.6rem);
  font-weight: 700;
  margin-bottom: 16px;
}
.cta-title span { display: inline; }
.cta-content p { font-size: 17px; opacity: 0.85; margin-bottom: 32px; }

/* ===== 通用 div 标题 ===== */
.section-title {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 700;
  color: var(--c-ink);
  margin-bottom: 32px;
  line-height: 1.3;
}
.section-title span { display: inline; }
.section-title.centered { text-align: center; }

/* ===== 文章页 ===== */
.article-layout {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}
.article-header-section {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 48px;
  align-items: start;
  padding: 60px 0 40px;
}
.article-meta-aside {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 24px 20px;
  background: var(--c-surface-2);
  border-radius: var(--radius-lg);
  border: 1px solid var(--c-border);
  position: sticky;
  top: calc(var(--nav-h) + var(--anchor-h) + 16px);
}
.article-date, .article-mod {
  font-size: 13px;
  font-weight: 500;
  color: var(--c-brown);
  display: block;
}
.tag {
  display: inline-block;
  padding: 4px 12px;
  border-radius: var(--radius-pill);
  background: var(--c-surface-3);
  border: 1px solid var(--c-border);
  font-size: 12px;
  color: var(--c-primary);
  font-weight: 600;
}
.breadcrumb-nav {
  display: flex;
  flex-direction: column;
  gap: 4px;
  font-size: 13px;
  color: var(--c-text-muted);
}
.breadcrumb-nav a {
  color: var(--c-primary);
  text-decoration: underline;
  text-decoration-color: transparent;
  transition: text-decoration-color var(--transition-fast);
}
.breadcrumb-nav a:hover { text-decoration-color: var(--c-primary); }
.breadcrumb-nav span { color: var(--c-text-muted); }
.article-h1 {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 3.5vw, 2.8rem);
  font-weight: 700;
  color: var(--c-ink);
  line-height: 1.25;
  margin-bottom: 16px;
}
.article-lead {
  font-size: 18px;
  color: var(--c-text-muted);
  line-height: 1.7;
  margin-bottom: 24px;
}
.article-hero-figure {
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-card);
}
.article-hero-img { width: 100%; border-radius: var(--radius-xl); }

/* 文章主体：div > figure/aside 交错 */
.article-body-section {
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: 48px;
  align-items: start;
  padding: 40px 0 60px;
  position: relative;
}
.article-deco-blob {
  position: absolute;
  top: -40px;
  left: -80px;
  width: 340px;
  height: 280px;
  pointer-events: none;
  z-index: 0;
}
.article-content {
  position: relative;
  z-index: 1;
}
.article-sidebar {
  position: sticky;
  top: calc(var(--nav-h) + var(--anchor-h) + 16px);
  background: var(--c-surface-2);
  border-radius: var(--radius-xl);
  padding: 28px 22px;
  border: 1px solid var(--c-border);
  display: flex;
  flex-direction: column;
  gap: 8px;
  z-index: 1;
}
.sidebar-link {
  display: block;
  padding: 10px 14px;
  border-radius: var(--radius-md);
  font-size: 14px;
  color: var(--c-text);
  background: var(--c-white);
  border: 1px solid var(--c-border);
  transition: background var(--transition-fast), color var(--transition-fast), transform var(--transition-fast);
  min-height: 40px;
  display: flex;
  align-items: center;
  line-height: 1.4;
}
.sidebar-link:hover {
  background: var(--c-primary);
  color: var(--c-white);
  border-color: var(--c-primary);
  transform: translateX(3px);
}
.sidebar-home { font-weight: 600; }

/* 相关文章 */
.related-section {
  padding: 60px 0 80px;
  border-top: 1px solid var(--c-border);
}
.related-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}
.related-card {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 24px 20px;
  background: var(--c-white);
  border-radius: var(--radius-xl);
  border: 1px solid var(--c-border);
  box-shadow: var(--shadow-soft);
  color: var(--c-text);
  transition: transform var(--transition-mid), box-shadow var(--transition-fast), border-color var(--transition-fast);
}
.related-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-hover);
  border-color: var(--c-primary);
}
.related-card strong {
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 600;
  color: var(--c-ink);
  line-height: 1.4;
}
.related-card span {
  font-size: 14px;
  color: var(--c-text-muted);
  line-height: 1.6;
}

/* ===== 正文排版 (prose) ===== */
.prose {
  font-size: 17px;
  line-height: 1.8;
  color: var(--c-text);
  max-width: var(--prose-max);
}
.prose h2 {
  font-family: var(--font-display);
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--c-ink);
  margin: 2em 0 0.75em;
  line-height: 1.3;
}
.prose h3 {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--c-ink-soft);
  margin: 1.6em 0 0.6em;
}
.prose h4 {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--c-ink-soft);
  margin: 1.4em 0 0.5em;
}
.prose p { margin-bottom: 1.2em; }
.prose ul, .prose ol {
  margin: 1em 0 1.2em 1.4em;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.prose ul { list-style: disc; }
.prose ol { list-style: decimal; }
.prose li { line-height: 1.7; }
.prose blockquote {
  margin: 1.5em 0;
  padding: 16px 24px;
  border-left: 4px solid var(--c-primary);
  background: var(--c-surface-2);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  font-style: italic;
  color: var(--c-ink-soft);
}
.prose a {
  color: var(--c-primary);
  text-decoration: underline;
  text-decoration-color: rgba(86,34,139,0.3);
  transition: text-decoration-color var(--transition-fast);
}
.prose a:hover { text-decoration-color: var(--c-primary); }
.prose strong { font-weight: 700; color: var(--c-ink); }
.prose em { font-style: italic; color: var(--c-ink-soft); }
.prose code {
  font-family: 'Courier New', monospace;
  font-size: 0.875em;
  background: var(--c-surface-3);
  padding: 2px 6px;
  border-radius: var(--radius-sm);
  color: var(--c-brown);
}
.prose pre {
  background: var(--c-ink);
  color: var(--c-surface);
  padding: 20px 24px;
  border-radius: var(--radius-lg);
  overflow-x: auto;
  margin: 1.4em 0;
}
.prose pre code { background: none; color: inherit; padding: 0; }
.prose table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.4em 0;
  font-size: 15px;
}
.prose th, .prose td {
  padding: 10px 14px;
  border: 1px solid var(--c-border);
  text-align: left;
}
.prose th {
  background: var(--c-surface-3);
  font-weight: 600;
  color: var(--c-ink);
}
.prose img {
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  margin: 1.6em 0;
}
.prose hr {
  border: none;
  border-top: 1px solid var(--c-border);
  margin: 2em 0;
}

/* ===== 关于页 ===== */
.about-layout {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}
.about-hero-section {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 48px;
  align-items: start;
  padding: 60px 0 48px;
  border-bottom: 1px solid var(--c-border);
}
.about-hero-aside {
  display: flex;
  flex-direction: column;
  gap: 16px;
  padding: 28px 22px;
  background: linear-gradient(160deg, var(--c-primary-dark) 0%, var(--c-primary) 100%);
  border-radius: var(--radius-xl);
  color: var(--c-white);
  position: sticky;
  top: calc(var(--nav-h) + 16px);
}
.about-badge {
  display: inline-block;
  padding: 5px 14px;
  border-radius: var(--radius-pill);
  background: rgba(255,255,255,0.15);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.05em;
  align-self: flex-start;
}
.about-quicknav {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.about-quicknav a, .privacy-quicknav a {
  display: flex;
  align-items: center;
  padding: 9px 14px;
  border-radius: var(--radius-md);
  font-size: 14px;
  background: rgba(255,255,255,0.1);
  color: rgba(255,255,255,0.9);
  min-height: 40px;
  transition: background var(--transition-fast);
}
.about-quicknav a:hover, .privacy-quicknav a:hover {
  background: rgba(255,255,255,0.2);
}
.about-h1 {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 700;
  color: var(--c-ink);
  line-height: 1.25;
  margin-bottom: 16px;
}
.about-lead {
  font-size: 18px;
  color: var(--c-text-muted);
  line-height: 1.7;
}
.about-content-section {
  display: grid;
  grid-template-columns: 1fr 260px;
  gap: 48px;
  align-items: start;
  padding: 56px 0;
  position: relative;
}
.about-deco {
  position: absolute;
  right: -60px;
  top: 0;
  width: 420px;
  pointer-events: none;
  z-index: 0;
}
.about-blob-svg { width: 100%; height: auto; }
.about-prose { position: relative; z-index: 1; }
.about-sidebar {
  position: sticky;
  top: calc(var(--nav-h) + 16px);
  background: var(--c-surface-2);
  border-radius: var(--radius-xl);
  padding: 28px 22px;
  border: 1px solid var(--c-border);
  display: flex;
  flex-direction: column;
  gap: 8px;
  z-index: 1;
}
.about-features-section {
  padding: 60px 0 80px;
  position: relative;
}
.features-blob {
  position: absolute;
  inset: 0;
  pointer-events: none;
}
.features-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  position: relative;
  z-index: 1;
  margin-top: 8px;
}
.feature-item {
  padding: 28px 22px;
  background: var(--c-white);
  border-radius: var(--radius-xl);
  border: 1px solid var(--c-border);
  box-shadow: var(--shadow-soft);
  transition: transform var(--transition-mid), box-shadow var(--transition-fast);
}
.feature-item:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-hover);
}
.feature-item h3 {
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 700;
  color: var(--c-primary);
  margin-bottom: 10px;
}
.feature-item h3 span { display: inline; }
.feature-item p { font-size: 14px; color: var(--c-text-muted); line-height: 1.6; }

/* ===== 隐私页 ===== */
.privacy-layout {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}
.privacy-header-section {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 48px;
  align-items: start;
  padding: 60px 0 48px;
  border-bottom: 1px solid var(--c-border);
}
.privacy-meta-aside {
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: 26px 20px;
  background: linear-gradient(160deg, var(--c-brown) 0%, var(--c-brown-light) 100%);
  border-radius: var(--radius-xl);
  color: var(--c-white);
  position: sticky;
  top: calc(var(--nav-h) + 16px);
}
.privacy-quicknav { display: flex; flex-direction: column; gap: 6px; }
.privacy-h1 {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 3.5vw, 2.6rem);
  font-weight: 700;
  color: var(--c-ink);
  line-height: 1.25;
  margin-bottom: 14px;
}
.privacy-lead { font-size: 17px; color: var(--c-text-muted); line-height: 1.7; }
.privacy-body-section {
  display: grid;
  grid-template-columns: 1fr 260px;
  gap: 48px;
  align-items: start;
  padding: 56px 0 80px;
  position: relative;
}
.privacy-deco {
  position: absolute;
  left: -60px;
  top: 40px;
  width: 300px;
  pointer-events: none;
  z-index: 0;
}
.privacy-content { position: relative; z-index: 1; }
.privacy-sidebar {
  position: sticky;
  top: calc(var(--nav-h) + 16px);
  background: var(--c-surface-2);
  border-radius: var(--radius-xl);
  padding: 28px 22px;
  border: 1px solid var(--c-border);
  display: flex;
  flex-direction: column;
  gap: 8px;
  z-index: 1;
}

/* ===== 默认页 ===== */
.default-layout {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}
.default-header-section {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 48px;
  align-items: start;
  padding: 60px 0 40px;
}
.default-meta-aside {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 24px 20px;
  background: var(--c-surface-2);
  border-radius: var(--radius-lg);
  border: 1px solid var(--c-border);
}
.default-meta-aside nav {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.default-meta-aside nav a {
  display: flex;
  align-items: center;
  padding: 8px 12px;
  border-radius: var(--radius-md);
  font-size: 14px;
  color: var(--c-primary);
  background: var(--c-surface-3);
  min-height: 40px;
  transition: background var(--transition-fast);
}
.default-meta-aside nav a:hover { background: var(--c-border); }
.default-h1 {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 3.5vw, 2.8rem);
  font-weight: 700;
  color: var(--c-ink);
  line-height: 1.25;
  margin-bottom: 14px;
}
.default-lead { font-size: 17px; color: var(--c-text-muted); line-height: 1.7; }
.default-body-section {
  display: grid;
  grid-template-columns: 1fr 260px;
  gap: 48px;
  align-items: start;
  padding: 40px 0 80px;
  position: relative;
}
.default-deco {
  position: absolute;
  left: -40px;
  top: 0;
  width: 280px;
  pointer-events: none;
  z-index: 0;
}
.default-content { position: relative; z-index: 1; }
.default-sidebar {
  position: sticky;
  top: calc(var(--nav-h) + 16px);
  background: var(--c-surface-2);
  border-radius: var(--radius-xl);
  padding: 28px 22px;
  border: 1px solid var(--c-border);
  display: flex;
  flex-direction: column;
  gap: 8px;
  z-index: 1;
}

/* ===== 页脚 ===== */
.site-footer {
  background: var(--c-ink);
  color: rgba(255,255,255,0.75);
  margin-top: auto;
  overflow: hidden;
  position: relative;
}
.footer-brand-bar {
  text-align: center;
  padding: 40px 24px 0;
  overflow: hidden;
}
.footer-brand-large {
  font-family: var(--font-display);
  font-size: clamp(2.5rem, 8vw, 6rem);
  font-weight: 700;
  color: rgba(86,34,139,0.2);
  letter-spacing: -0.03em;
  display: block;
  line-height: 1;
  user-select: none;
  white-space: nowrap;
}
/* footer > div×n（契约）*/
.site-footer {
  display: grid;
  grid-template-columns: 1fr 1fr;
  grid-template-rows: auto auto auto;
}
.footer-brand-bar {
  grid-column: 1 / -1;
}
.footer-section {
  padding: 40px 48px 40px;
  border-top: 1px solid rgba(255,255,255,0.08);
}
.footer-section:first-of-type { padding-left: max(48px, calc((100vw - var(--container)) / 2 + 24px)); }
.footer-section:last-of-type  { padding-right: max(48px, calc((100vw - var(--container)) / 2 + 24px)); }
.footer-heading {
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 700;
  color: rgba(255,255,255,0.5);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 16px;
}
.footer-heading span { display: inline; }
.footer-desc {
  font-size: 14px;
  line-height: 1.7;
  color: rgba(255,255,255,0.55);
  margin-bottom: 14px;
}
.footer-nav nav {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.footer-link {
  font-size: 14px;
  color: rgba(255,255,255,0.6);
  display: inline-flex;
  align-items: center;
  min-height: 36px;
  transition: color var(--transition-fast);
}
.footer-link:hover { color: var(--c-white); }
.footer-bottom {
  grid-column: 1 / -1;
  padding: 20px max(24px, calc((100vw - var(--container)) / 2 + 24px));
  border-top: 1px solid rgba(255,255,255,0.08);
  text-align: center;
  font-size: 13px;
  color: rgba(255,255,255,0.4);
}
.footer-bottom a { color: rgba(255,255,255,0.55); }
.footer-bottom a:hover { color: var(--c-white); }

/* ===== 页面内容区（内页正文）===== */
.page-content {
  font-size: 17px;
  line-height: 1.8;
  color: var(--c-text);
}
.page-content h2 {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--c-ink);
  margin: 1.8em 0 0.6em;
}
.page-content p { margin-bottom: 1.1em; }
.page-content a { color: var(--c-primary); text-decoration: underline; }

/* ===== 动效 ===== */
@media (prefers-reduced-motion: no-preference) {
  .article-card,
  .related-card,
  .feature-item {
    animation: fadeSlideUp 0.5s ease both;
  }
  .articles-grid .article-card:nth-child(1) { animation-delay: 0.05s; }
  .articles-grid .article-card:nth-child(2) { animation-delay: 0.10s; }
  .articles-grid .article-card:nth-child(3) { animation-delay: 0.15s; }
  .articles-grid .article-card:nth-child(4) { animation-delay: 0.20s; }
  .articles-grid .article-card:nth-child(5) { animation-delay: 0.25s; }
  .articles-grid .article-card:nth-child(6) { animation-delay: 0.30s; }
  .related-grid .related-card:nth-child(1) { animation-delay: 0.05s; }
  .related-grid .related-card:nth-child(2) { animation-delay: 0.12s; }
  .related-grid .related-card:nth-child(3) { animation-delay: 0.19s; }
  .related-grid .related-card:nth-child(4) { animation-delay: 0.26s; }
  .features-grid .feature-item:nth-child(1) { animation-delay: 0.06s; }
  .features-grid .feature-item:nth-child(2) { animation-delay: 0.12s; }
  .features-grid .feature-item:nth-child(3) { animation-delay: 0.18s; }
  .features-grid .feature-item:nth-child(4) { animation-delay: 0.24s; }
}
@keyframes fadeSlideUp {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
  .hero-blob { animation: none !important; }
}

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
  .articles-grid { grid-template-columns: repeat(2, 1fr); }
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .intro-section { grid-template-columns: 1fr; }
  .intro-aside { position: static; }
  .article-body-section { grid-template-columns: 1fr 240px; gap: 32px; }
  .about-content-section { grid-template-columns: 1fr 240px; }
  .footer-section:first-of-type { padding-left: 32px; }
  .footer-section:last-of-type  { padding-right: 32px; }
}

@media (max-width: 768px) {
  :root { --nav-h: 60px; }
  .header-inner { padding: 0 16px; gap: 12px; }
  .primary-nav { display: none; }
  .nav-cta-btn { padding: 10px 16px; font-size: 13px; }
  .nav-brand-text { font-size: 15px; }

  .hero-section { padding: 60px 16px 48px; min-height: auto; padding-top: 80px; }
  .hero-h1 { font-size: 2rem; }
  .hero-desc { font-size: 16px; }
  .hero-actions { flex-direction: column; align-items: center; gap: 12px; }

  .anchor-strip { display: none; }

  .intro-section { margin: 48px auto; padding: 0 16px; }

  .articles-section { padding: 48px 16px; }
  .articles-grid { grid-template-columns: 1fr; gap: 16px; }

  .article-layout,
  .about-layout,
  .privacy-layout,
  .default-layout { padding: 0 16px; }

  .article-header-section,
  .about-hero-section,
  .privacy-header-section,
  .default-header-section {
    grid-template-columns: 1fr;
    gap: 24px;
    padding: 40px 0 28px;
  }
  .article-meta-aside,
  .about-hero-aside,
  .privacy-meta-aside,
  .default-meta-aside {
    position: static;
  }
  .article-body-section,
  .about-content-section,
  .privacy-body-section,
  .default-body-section {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  .article-sidebar,
  .about-sidebar,
  .privacy-sidebar,
  .default-sidebar {
    position: static;
  }
  .article-deco-blob,
  .about-deco,
  .privacy-deco,
  .default-deco { display: none; }

  .related-grid { grid-template-columns: 1fr; }
  .features-grid { grid-template-columns: 1fr; }

  .cta-section { padding: 0 16px; margin: 48px auto; }
  .cta-content { padding: 40px 24px; }

  .site-footer { grid-template-columns: 1fr; }
  .footer-brand-large { font-size: 2.5rem; }
  .footer-section { padding: 28px 16px; }
  .footer-section:first-of-type { padding-left: 16px; }
  .footer-section:last-of-type  { padding-right: 16px; }
  .footer-bottom { padding: 16px; }

  .section-title { font-size: 1.5rem; }
  .cta-title { font-size: 1.6rem; }
}

@media (max-width: 480px) {
  body { font-size: 16px; }
  .btn-primary, .btn-ghost { padding: 13px 24px; font-size: 15px; min-height: 52px; }
  .prose { font-size: 16px; }
  .article-h1, .about-h1, .privacy-h1 { font-size: 1.7rem; }
}