/* =============================================
   鸡腿云 (jituiyun.lol) — 全站样式表
   设计风格: 黑白极简 · 大量留白 · 粗圆字体 · 克制动效
   ============================================= */

/* ─── CSS 变量 ─── */
:root {
  --clr-bg: #ffffff;
  --clr-surface: #f7f7f7;
  --clr-border: #e0e0e0;
  --clr-text: #111111;
  --clr-muted: #555555;
  --clr-accent: #111111;
  --clr-accent-inv: #ffffff;
  --clr-featured-bg: #111111;
  --clr-featured-text: #ffffff;
  --radius: 14px;
  --radius-lg: 22px;
  --shadow: 0 2px 16px rgba(0,0,0,0.07);
  --shadow-hover: 0 6px 28px rgba(0,0,0,0.13);
  --transition: 0.22s cubic-bezier(.4,0,.2,1);
  --font-sans: 'PingFang SC', 'HarmonyOS Sans SC', 'Microsoft YaHei', 'Hiragino Sans GB', system-ui, -apple-system, sans-serif;
  --font-round: 'PingFang SC', 'HarmonyOS Sans SC', 'Noto Sans SC', 'Microsoft YaHei', system-ui, sans-serif;
  --max-w: 1120px;
  --section-gap: 96px;
}

/* ─── 基础重置 ─── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
}
body {
  font-family: var(--font-sans);
  background: var(--clr-bg);
  color: var(--clr-text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
img { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
button { cursor: pointer; border: none; background: none; font-family: inherit; }

/* ─── 布局容器 ─── */
.container {
  width: 100%;
  max-width: var(--max-w);
  margin-inline: auto;
  padding-inline: 24px;
}

/* ─── 章节间距 ─── */
section { padding-block: var(--section-gap); }

/* ─── 章节标题 ─── */
.section-title {
  font-family: var(--font-round);
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  text-align: center;
  margin-bottom: 56px;
}
.section-subtitle {
  text-align: center;
  color: var(--clr-muted);
  margin-top: -40px;
  margin-bottom: 52px;
  font-size: 1.05rem;
}

/* ─── 页眉 ─── */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255,255,255,0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--clr-border);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  gap: 16px;
}
.logo {
  font-family: var(--font-round);
  font-size: 1.35rem;
  font-weight: 900;
  letter-spacing: -0.03em;
  color: var(--clr-text);
  white-space: nowrap;
  flex-shrink: 0;
}
.logo:focus-visible { outline: 2px solid var(--clr-text); outline-offset: 3px; border-radius: 4px; }
.logo span { color: var(--clr-muted); font-weight: 400; }

.nav-links {
  display: flex;
  gap: 4px;
  flex-wrap: wrap;
}
.nav-links a {
  padding: 6px 13px;
  border-radius: 8px;
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--clr-muted);
  transition: color var(--transition), background var(--transition);
  white-space: nowrap;
}
.nav-links a:hover,
.nav-links a:focus-visible { color: var(--clr-text); background: var(--clr-surface); }
.nav-links a:focus-visible { outline: 2px solid var(--clr-text); outline-offset: 1px; }
.nav-links a.active { color: var(--clr-text); font-weight: 700; }

/* 汉堡菜单 */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
  border-radius: 8px;
  transition: background var(--transition);
}
.nav-toggle:hover { background: var(--clr-surface); }
.nav-toggle:focus-visible { outline: 2px solid var(--clr-text); outline-offset: 2px; }
.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--clr-text);
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}
.nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ─── 按钮 ─── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 28px;
  border-radius: 50px;
  font-size: 0.97rem;
  font-weight: 700;
  font-family: var(--font-round);
  text-align: center;
  transition: background var(--transition), color var(--transition), box-shadow var(--transition), transform var(--transition);
  white-space: nowrap;
}
.btn:focus-visible { outline: 2px solid var(--clr-text); outline-offset: 3px; }
.btn-primary {
  background: var(--clr-accent);
  color: var(--clr-accent-inv);
  box-shadow: 0 2px 10px rgba(0,0,0,0.12);
}
.btn-primary:hover { background: #333; box-shadow: 0 4px 18px rgba(0,0,0,0.2); transform: translateY(-1px); }
.btn-primary:active { transform: translateY(0); }
.btn-secondary {
  background: transparent;
  color: var(--clr-text);
  border: 2px solid var(--clr-border);
}
.btn-secondary:hover { border-color: var(--clr-text); box-shadow: var(--shadow); transform: translateY(-1px); }
.btn-sm { padding: 8px 18px; font-size: 0.88rem; }

/* ─── 主视觉 Hero ─── */
#hero {
  padding-block: 100px 80px;
  border-bottom: 1px solid var(--clr-border);
  background: var(--clr-bg);
}
.hero-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  align-items: center;
}
.hero-eyebrow {
  display: inline-block;
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: 50px;
  padding: 4px 14px;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--clr-muted);
  margin-bottom: 20px;
  letter-spacing: 0.04em;
}
.hero-content h1 {
  font-family: var(--font-round);
  font-size: clamp(2rem, 4.5vw, 3.4rem);
  font-weight: 900;
  line-height: 1.18;
  letter-spacing: -0.03em;
  margin-bottom: 20px;
}
.hero-subtitle {
  font-size: 1.1rem;
  color: var(--clr-muted);
  line-height: 1.75;
  margin-bottom: 36px;
  max-width: 440px;
}
.hero-actions {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}
.hero-visual {
  display: flex;
  justify-content: center;
  align-items: center;
}
.hero-card-wrap {
  display: flex;
  flex-direction: column;
  gap: 16px;
  width: 100%;
  max-width: 380px;
}
.visual-card {
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-lg);
  padding: 28px 28px 24px;
  transition: box-shadow var(--transition), transform var(--transition);
}
.visual-card:hover { box-shadow: var(--shadow-hover); transform: translateY(-3px); }
.visual-card-dark {
  background: var(--clr-text);
  color: var(--clr-accent-inv);
  border-color: transparent;
}
.visual-card-dark .vc-label { color: rgba(255,255,255,0.6); }
.vc-icon {
  font-size: 2rem;
  margin-bottom: 12px;
  display: block;
}
.vc-label {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 700;
  color: var(--clr-muted);
  margin-bottom: 4px;
}
.vc-title {
  font-family: var(--font-round);
  font-size: 1.1rem;
  font-weight: 800;
  margin-bottom: 6px;
}
.vc-desc {
  font-size: 0.9rem;
  color: var(--clr-muted);
  line-height: 1.6;
}
.visual-card-dark .vc-desc { color: rgba(255,255,255,0.7); }

/* hero 随机布局（桌面） */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(18px); }
  to   { opacity: 1; transform: translateY(0); }
}
.visual-card { animation: fadeInUp 0.5s ease both; }
.visual-card:nth-child(2) { animation-delay: 0.1s; }
.visual-card:nth-child(3) { animation-delay: 0.2s; }

/* ─── 卡片网格 ─── */
.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.card {
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  transition: box-shadow var(--transition), transform var(--transition), border-color var(--transition);
}
.card:hover { box-shadow: var(--shadow-hover); transform: translateY(-4px); border-color: #ccc; }
.card-icon {
  font-size: 1.8rem;
  margin-bottom: 16px;
  display: block;
}
.card h3 {
  font-family: var(--font-round);
  font-size: 1.05rem;
  font-weight: 800;
  margin-bottom: 10px;
}
.card p {
  font-size: 0.93rem;
  color: var(--clr-muted);
  line-height: 1.7;
}

/* ─── 流媒体标签 ─── */
.streaming-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
  margin-bottom: 40px;
}
.streaming-tag {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: 50px;
  padding: 8px 18px;
  font-size: 0.9rem;
  font-weight: 600;
  transition: background var(--transition), border-color var(--transition), transform var(--transition);
}
.streaming-tag:hover { background: var(--clr-text); color: #fff; border-color: transparent; transform: scale(1.04); }
.streaming-tag .tag-icon { font-size: 1.1rem; }
.streaming-note {
  text-align: center;
  font-size: 0.86rem;
  color: var(--clr-muted);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius);
  padding: 14px 20px;
  max-width: 700px;
  margin-inline: auto;
}

/* ─── 套餐卡片 ─── */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  align-items: stretch;
}
.pricing-card {
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-lg);
  padding: 36px 28px 28px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 28px;
  transition: box-shadow var(--transition), transform var(--transition);
}
.pricing-card:hover { box-shadow: var(--shadow-hover); transform: translateY(-4px); }
.pricing-card.featured {
  background: var(--clr-featured-bg);
  color: var(--clr-featured-text);
  border-color: transparent;
  position: relative;
}
.pricing-card.featured .pricing-features li { color: rgba(255,255,255,0.8); }
.pricing-card.featured .pricing-features li::before { color: rgba(255,255,255,0.6); }
.pricing-card.featured .price-period { color: rgba(255,255,255,0.6); }
.pricing-card.featured .btn-primary {
  background: #fff;
  color: #111;
}
.pricing-card.featured .btn-primary:hover { background: #e8e8e8; }
.badge {
  display: inline-block;
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: 50px;
  padding: 3px 12px;
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--clr-muted);
  margin-bottom: 12px;
  letter-spacing: 0.03em;
}
.pricing-card.featured .badge {
  background: rgba(255,255,255,0.15);
  border-color: rgba(255,255,255,0.25);
  color: rgba(255,255,255,0.85);
}
.pricing-card h3 {
  font-family: var(--font-round);
  font-size: 1.15rem;
  font-weight: 800;
  margin-bottom: 14px;
}
.price {
  font-family: var(--font-round);
  font-size: 2.6rem;
  font-weight: 900;
  letter-spacing: -0.03em;
  line-height: 1;
  margin-bottom: 6px;
}
.price-period {
  font-size: 0.88rem;
  color: var(--clr-muted);
  margin-bottom: 20px;
}
.pricing-features {
  display: flex;
  flex-direction: column;
  gap: 9px;
  margin-bottom: 4px;
}
.pricing-features li {
  font-size: 0.92rem;
  color: var(--clr-muted);
  display: flex;
  align-items: flex-start;
  gap: 8px;
}
.pricing-features li::before {
  content: '✓';
  font-weight: 700;
  color: var(--clr-text);
  flex-shrink: 0;
  margin-top: 1px;
}
.pricing-cta { width: 100%; text-align: center; }

/* ─── 节点信息条 ─── */
.node-bar {
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-lg);
  padding: 36px 32px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  text-align: center;
  margin-bottom: 0;
}
.node-stat strong {
  display: block;
  font-family: var(--font-round);
  font-size: 2rem;
  font-weight: 900;
  letter-spacing: -0.02em;
}
.node-stat span {
  font-size: 0.87rem;
  color: var(--clr-muted);
}

/* ─── FAQ ─── */
.faq-list { max-width: 760px; margin-inline: auto; display: flex; flex-direction: column; gap: 0; }
.faq-item {
  border-bottom: 1px solid var(--clr-border);
}
.faq-item:first-child { border-top: 1px solid var(--clr-border); }
.faq-question {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 4px;
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  gap: 12px;
  user-select: none;
  transition: color var(--transition);
}
.faq-question:hover { color: var(--clr-muted); }
.faq-question:focus-visible { outline: 2px solid var(--clr-text); outline-offset: 2px; border-radius: 4px; }
.faq-chevron {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  transition: transform var(--transition);
  color: var(--clr-muted);
}
.faq-item.open .faq-chevron { transform: rotate(180deg); }
.faq-answer {
  display: none;
  padding: 0 4px 20px;
  font-size: 0.95rem;
  color: var(--clr-muted);
  line-height: 1.75;
}
.faq-item.open .faq-answer { display: block; }

/* ─── 用户评价（隐藏，待提供真实数据） ─── */
#testimonials { display: none; }

/* ─── 页脚 ─── */
.site-footer {
  border-top: 1px solid var(--clr-border);
  padding-block: 40px;
  background: var(--clr-bg);
}
.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
  text-align: center;
}
.footer-logo {
  font-family: var(--font-round);
  font-size: 1.1rem;
  font-weight: 900;
  letter-spacing: -0.02em;
}
.footer-links {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: center;
}
.footer-links a {
  padding: 6px 14px;
  border-radius: 8px;
  font-size: 0.9rem;
  color: var(--clr-muted);
  transition: color var(--transition), background var(--transition);
}
.footer-links a:hover { color: var(--clr-text); background: var(--clr-surface); }
.footer-links a:focus-visible { outline: 2px solid var(--clr-text); outline-offset: 2px; border-radius: 4px; }
.footer-copy { font-size: 0.82rem; color: var(--clr-muted); }

/* ─── 章节滚动箭头 ─── */
.scroll-nav {
  position: fixed;
  right: 20px;
  top: 50%;
  transform: translateY(-50%);
  display: flex;
  flex-direction: column;
  gap: 10px;
  z-index: 200;
}
.scroll-nav-btn {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: var(--clr-bg);
  border: 1.5px solid var(--clr-border);
  box-shadow: var(--shadow);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  color: var(--clr-text);
  transition: background var(--transition), box-shadow var(--transition), color var(--transition), transform var(--transition);
  cursor: pointer;
}
.scroll-nav-btn:hover:not(:disabled) {
  background: var(--clr-text);
  color: #fff;
  box-shadow: var(--shadow-hover);
  transform: scale(1.08);
}
.scroll-nav-btn:focus-visible { outline: 2px solid var(--clr-text); outline-offset: 2px; }
.scroll-nav-btn:disabled { opacity: 0.25; cursor: not-allowed; transform: none; }
.scroll-nav-btn svg { width: 16px; height: 16px; stroke: currentColor; fill: none; stroke-width: 2.5; stroke-linecap: round; stroke-linejoin: round; }

/* ─── 通用页面（about/terms/privacy/sitemap） ─── */
.page-hero {
  padding-block: 72px 48px;
  border-bottom: 1px solid var(--clr-border);
}
.page-hero h1 {
  font-family: var(--font-round);
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 900;
  letter-spacing: -0.03em;
  margin-bottom: 12px;
}
.page-hero p { color: var(--clr-muted); font-size: 1.05rem; }
.page-body { padding-block: 56px; }
.page-body h2 {
  font-family: var(--font-round);
  font-size: 1.25rem;
  font-weight: 800;
  margin: 36px 0 12px;
}
.page-body h3 { font-size: 1.05rem; font-weight: 700; margin: 24px 0 8px; }
.page-body p, .page-body li { font-size: 0.97rem; color: var(--clr-muted); line-height: 1.8; margin-bottom: 8px; }
.page-body ul { list-style: disc; padding-left: 22px; margin-bottom: 14px; }
.page-body a { color: var(--clr-text); text-decoration: underline; text-underline-offset: 3px; }
.page-body a:hover { opacity: 0.7; }
.notice-box {
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius);
  padding: 18px 22px;
  font-size: 0.9rem;
  color: var(--clr-muted);
  margin: 16px 0;
}

/* ─── 文章列表页 ─── */
.article-list { display: flex; flex-direction: column; gap: 1px; }
.article-list-item {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 16px;
  align-items: start;
  padding: 28px 0;
  border-bottom: 1px solid var(--clr-border);
  transition: background var(--transition);
}
.article-list-item:first-child { border-top: 1px solid var(--clr-border); }
.article-list-item:hover { background: var(--clr-surface); border-radius: var(--radius); padding-inline: 16px; }
.article-list-item h2 {
  font-family: var(--font-round);
  font-size: 1.08rem;
  font-weight: 800;
  margin-bottom: 6px;
}
.article-list-item h2 a { transition: opacity var(--transition); }
.article-list-item h2 a:hover { opacity: 0.65; }
.article-list-item p { font-size: 0.93rem; color: var(--clr-muted); line-height: 1.65; }
.article-meta {
  font-size: 0.82rem;
  color: var(--clr-muted);
  white-space: nowrap;
}
.article-tag {
  display: inline-block;
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: 50px;
  padding: 2px 10px;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--clr-muted);
  margin-bottom: 8px;
}

/* ─── 独立文章页 ─── */
.article-page { max-width: 740px; margin-inline: auto; }
.article-header { padding-block: 60px 36px; border-bottom: 1px solid var(--clr-border); }
.article-header h1 {
  font-family: var(--font-round);
  font-size: clamp(1.6rem, 3.5vw, 2.4rem);
  font-weight: 900;
  letter-spacing: -0.03em;
  line-height: 1.25;
  margin-bottom: 16px;
}
.article-info {
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
  font-size: 0.86rem;
  color: var(--clr-muted);
}
.article-content { padding-block: 40px; }
.article-content h2 { font-family: var(--font-round); font-size: 1.3rem; font-weight: 800; margin: 36px 0 12px; }
.article-content h3 { font-size: 1.08rem; font-weight: 700; margin: 24px 0 8px; }
.article-content p { font-size: 0.97rem; color: var(--clr-muted); line-height: 1.85; margin-bottom: 16px; }
.article-content ul, .article-content ol { padding-left: 22px; margin-bottom: 16px; }
.article-content li { font-size: 0.97rem; color: var(--clr-muted); line-height: 1.75; margin-bottom: 6px; }
.article-content a { color: var(--clr-text); text-decoration: underline; text-underline-offset: 3px; }
.article-content a:hover { opacity: 0.7; }
.article-promo-box {
  background: var(--clr-text);
  color: #fff;
  border-radius: var(--radius-lg);
  padding: 28px 28px 24px;
  margin: 36px 0;
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.article-promo-box h3 { font-family: var(--font-round); font-size: 1.05rem; font-weight: 800; color: #fff; margin: 0; }
.article-promo-box p { color: rgba(255,255,255,0.75); font-size: 0.9rem; margin: 0; }
.article-back {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--clr-muted);
  margin-bottom: 28px;
  transition: color var(--transition);
}
.article-back:hover { color: var(--clr-text); }
.article-footer-nav {
  border-top: 1px solid var(--clr-border);
  padding-top: 32px;
  margin-top: 16px;
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}
.home-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.88rem;
  color: var(--clr-muted);
  transition: color var(--transition);
}
.home-link:hover { color: var(--clr-text); }

/* ─── Sitemap 页 ─── */
.sitemap-section { margin-bottom: 40px; }
.sitemap-section h2 { font-family: var(--font-round); font-size: 1.1rem; font-weight: 800; margin-bottom: 14px; }
.sitemap-links { display: flex; flex-direction: column; gap: 8px; }
.sitemap-links a {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.95rem;
  color: var(--clr-text);
  padding: 10px 14px;
  border-radius: var(--radius);
  border: 1px solid transparent;
  transition: background var(--transition), border-color var(--transition);
}
.sitemap-links a:hover { background: var(--clr-surface); border-color: var(--clr-border); }
.sitemap-links a:focus-visible { outline: 2px solid var(--clr-text); outline-offset: 2px; }
.sitemap-links a span { color: var(--clr-muted); font-size: 0.85rem; }

/* ─── 响应式：平板 ─── */
@media (max-width: 900px) {
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .pricing-grid { grid-template-columns: 1fr; max-width: 440px; margin-inline: auto; }
  .node-bar { grid-template-columns: repeat(2, 1fr); }
  .hero-grid { grid-template-columns: 1fr; gap: 40px; }
  .hero-card-wrap { max-width: 100%; }
}

/* ─── 响应式：手机 ─── */
@media (max-width: 600px) {
  :root { --section-gap: 60px; }
  .nav-links { display: none; position: absolute; top: 64px; left: 0; right: 0; background: rgba(255,255,255,0.97); border-bottom: 1px solid var(--clr-border); flex-direction: column; gap: 2px; padding: 12px 16px; }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 12px 14px; font-size: 1rem; }
  .nav-toggle { display: flex; }
  .header-inner { position: relative; }
  .grid-3 { grid-template-columns: 1fr; }
  .grid-4 { grid-template-columns: 1fr 1fr; }
  .node-bar { grid-template-columns: 1fr 1fr; gap: 16px; }
  .hero-actions { flex-direction: column; }
  .hero-actions .btn { width: 100%; }
  .scroll-nav { right: 10px; }
  .scroll-nav-btn { width: 36px; height: 36px; font-size: 0.95rem; }
  .article-list-item { grid-template-columns: 1fr; }
  .article-meta { margin-top: -4px; }
}

/* ─── 焦点可见性全局增强 ─── */
:focus-visible { outline: 2px solid var(--clr-text); outline-offset: 2px; }

/* ─── 打印 ─── */
@media print {
  .site-header, .scroll-nav, .site-footer { display: none; }
  body { font-size: 12pt; }
}