:root {
  --seed-bg: #FAFDFB;
  --seed-fg: #0F1F14;
  --seed-primary: #2F9E4F;
  --seed-accent: #1B6B3E;
  --seed-surface: #FFFFFF;
  --seed-radius: 12px;
  --color-bg: var(--seed-bg);
  --color-fg: var(--seed-fg);
  --color-primary: var(--seed-primary);
  --color-primary-600: #248A42;
  --color-primary-700: #1B6B3E;
  --color-accent: var(--seed-accent);
  --color-surface: var(--seed-surface);
  --color-muted: #5A6B5F;
  --color-muted-light: #9EABA2;
  --color-border: #D7E8DD;
  --color-border-light: #EAF4EE;
  --color-card-shadow: rgba(15, 31, 20, 0.06);
  --color-white: #FFFFFF;
  --color-footer-text: rgba(255, 255, 255, 0.7);
  --color-footer-border: rgba(255, 255, 255, 0.1);
  --color-footer-link-hover: #FFFFFF;
  --color-hero-surface: #F0F9F2;
  --font-sans: "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-mono: "SF Mono", "Fira Code", "Roboto Mono", monospace;
  --text-display: clamp(2.5rem, 5vw + 1rem, 3.75rem);
  --text-h1: clamp(1.75rem, 3vw + 0.5rem, 2.5rem);
  --text-h2: clamp(1.25rem, 1.5vw + 0.75rem, 1.75rem);
  --text-h3: 1.125rem;
  --text-body: 1rem;
  --text-small: 0.875rem;
  --text-caption: 0.75rem;
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  --space-4xl: 5rem;
  --max-width: 1200px;
  --radius-sm: calc(var(--seed-radius) * 0.666);
  --radius-md: var(--seed-radius);
  --radius-lg: calc(var(--seed-radius) * 1.333);
  --radius-pill: 9999px;
  --article-display: clamp(1.75rem, 4vw + 0.5rem, 2.25rem);
  --article-h2: clamp(1.05rem, 1.5vw + 0.75rem, 1.25rem);
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: var(--text-body);
  line-height: 1.6;
  color: var(--color-fg);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
h1, h2, h3, h4, p { margin: 0; }
a { color: inherit; text-decoration: none; }
img { max-width: 100%; height: auto; display: block; }
button { font-family: inherit; }
ul, ol { margin: 0; padding: 0; list-style: none; }

.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}
.section { padding: var(--space-4xl) 0; }

/* Navigation */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(250, 253, 251, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  transition: box-shadow 0.2s ease;
}
.nav.scrolled { box-shadow: 0 1px 12px rgba(15, 31, 20, 0.06); }
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}
.nav-logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--color-fg);
}
.nav-logo img { width: 32px; height: 32px; display: block; }
.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-xl);
}
.nav-links a {
  font-size: var(--text-small);
  font-weight: 500;
  color: var(--color-muted);
  transition: color 0.15s ease;
}
.nav-links a:hover,
.nav-links a.active { color: var(--color-primary); }
.nav-links a.active { font-weight: 600; }
.nav-cta {
  background: var(--color-fg);
  color: #fff;
  padding: 0.625rem 1.25rem;
  border-radius: var(--radius-pill);
  font-size: var(--text-small);
  font-weight: 600;
  transition: background 0.15s ease;
}
.nav-cta:hover { background: var(--color-accent); }
.nav-toggle {
  display: none;
  background: none;
  border: none;
  padding: var(--space-sm);
  cursor: pointer;
}
.nav-toggle svg { width: 24px; height: 24px; }

@media (max-width: 900px) {
  .nav-links { display: none; }
  .nav-links.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    padding: var(--space-lg);
    gap: var(--space-md);
    box-shadow: 0 12px 24px rgba(15, 31, 20, 0.06);
  }
  .nav-cta { display: none; }
  .nav-toggle { display: block; }
}

/* News shell */
html:has(body.news-shell) { overflow: hidden; }
body.news-shell { overflow: hidden; }
.news-section { padding: 0; }
.news-layout {
  display: flex;
  gap: 0;
  height: calc(100vh - 72px);
  margin-top: 72px;
  border-top: 1px solid var(--color-border);
  overflow: hidden;
  background: var(--color-surface);
}
.news-sidebar {
  width: 340px;
  flex-shrink: 0;
  height: 100%;
  border-right: 1px solid var(--color-border);
  background: var(--color-bg);
  display: flex;
  flex-direction: column;
}
.news-sidebar-header {
  padding: var(--space-md) var(--space-xl);
  border-bottom: 1px solid var(--color-border);
  flex-shrink: 0;
}
.news-sidebar-title {
  font-size: var(--text-h3);
  font-weight: 700;
}
.news-list {
  flex: 1;
  min-height: 0;
  overflow-y: auto;
  -ms-overflow-style: none;
  scrollbar-width: none;
}
.news-list::-webkit-scrollbar { display: none; }
.news-item {
  display: flex;
  flex-direction: column;
  justify-content: center;
  width: 100%;
  min-height: 40px;
  padding: 0.5rem var(--space-xl);
  border: none;
  border-bottom: 1px solid var(--color-border);
  border-left: 3px solid transparent;
  background: transparent;
  cursor: pointer;
  text-align: left;
  transition: background 0.15s ease;
  font: inherit;
  color: inherit;
  text-decoration: none;
}
.news-item:first-child { padding-top: 0.75rem; }
.news-item:hover { background: var(--color-border-light); }
.news-item.active {
  background: var(--color-border-light);
  border-left-color: var(--color-primary);
}
.news-item-title {
  font-size: var(--text-small);
  font-weight: 600;
  line-height: 1.4;
  color: var(--color-fg);
  margin-bottom: 0.125rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.news-item-date {
  font-size: var(--text-caption);
  color: var(--color-muted);
}
.news-viewer {
  flex: 1;
  min-width: 0;
  height: 100%;
  background: var(--color-surface);
  overflow-y: auto;
  -ms-overflow-style: none;
  scrollbar-width: none;
}
.news-viewer::-webkit-scrollbar { display: none; }
.news-frame {
  width: 100%;
  min-height: 100%;
  height: 100%;
  border: none;
  display: block;
  background: var(--color-surface);
}
.news-status {
  padding: var(--space-2xl) var(--space-xl);
  color: var(--color-muted);
  font-size: var(--text-small);
}
/* noscript 降级列表：有 JS 时整块不渲染，不会出现双列表 */
.seo-article-links {
  padding: var(--space-md) var(--space-xl);
  border-top: 1px solid var(--color-border);
}
.seo-article-links a {
  display: block;
  padding: 0.35rem 0;
  font-size: var(--text-small);
  color: var(--color-fg);
}
.seo-article-links a:hover { color: var(--color-primary); }

@media (max-width: 900px) {
  body.news-shell { overflow: auto; }
  .news-layout {
    flex-direction: column;
    height: auto;
    min-height: calc(100vh - 72px);
    overflow: visible;
  }
  .news-sidebar {
    width: 100%;
    height: auto;
    border-right: none;
    border-bottom: 1px solid var(--color-border);
  }
  .news-list { max-height: 280px; }
  .news-viewer { height: auto; min-height: 50vh; }
  .news-frame { min-height: 50vh; height: 70vh; }
}

/* Article (standalone + embedded) */
body.article-page {
  line-height: 1.7;
}
.article {
  max-width: 720px;
  margin: 0 auto;
  padding: var(--space-xl) var(--space-lg) var(--space-2xl);
}
.article-tag {
  display: inline-flex;
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-pill);
  background: var(--color-border-light);
  color: var(--color-primary);
  font-size: var(--text-small);
  font-weight: 600;
  margin-bottom: var(--space-md);
}
.article-title {
  font-size: var(--article-display);
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-md);
}
.article-meta {
  font-size: var(--text-small);
  color: var(--color-muted);
  margin-bottom: var(--space-xl);
  padding-bottom: var(--space-lg);
  border-bottom: 1px solid var(--color-border);
}
.article-content {
  font-size: 1.0625rem;
  color: var(--color-fg);
  line-height: 1.9;
}
.article-content p { margin-bottom: var(--space-lg); }
.article-content h2 {
  font-size: var(--article-h2);
  font-weight: 700;
  margin-top: var(--space-xl);
  margin-bottom: var(--space-md);
  color: var(--color-fg);
}
.article-content ul {
  list-style: disc;
  padding-left: var(--space-xl);
  margin-bottom: var(--space-lg);
}
.article-content li {
  margin-bottom: var(--space-sm);
  line-height: 1.8;
}
.article-content a { color: var(--color-primary); }
.article-content strong { color: var(--color-accent); }

.article-faq {
  margin-top: var(--space-2xl);
  padding-top: var(--space-xl);
  border-top: 1px solid var(--color-border);
}
.article-faq > h2 {
  font-size: var(--article-h2);
  font-weight: 700;
  margin-bottom: var(--space-lg);
}
.faq-item { margin-bottom: var(--space-lg); }
.faq-q {
  font-size: var(--text-body);
  font-weight: 700;
  margin-bottom: var(--space-sm);
  color: var(--color-fg);
}
.faq-a {
  font-size: var(--text-small);
  line-height: 1.8;
  color: var(--color-muted);
  margin: 0;
}

.article-related {
  margin-top: var(--space-2xl);
  padding-top: var(--space-xl);
  border-top: 1px solid var(--color-border);
}
.article-related > h2 {
  font-size: var(--article-h2);
  font-weight: 700;
  margin-bottom: var(--space-md);
}
.article-related ul {
  list-style: none;
  padding: 0;
  margin: 0;
}
.article-related li {
  margin-bottom: var(--space-sm);
  line-height: 1.7;
}
.article-related a {
  color: var(--color-primary);
  font-size: var(--text-small);
  font-weight: 600;
}
.article-related a:hover { text-decoration: underline; }