:root {
  --bg-page: #f5f3ef;
  --bg-card: #ffffff;
  --bg-subtle: #efece5;
  --text-primary: #2a2a28;
  --text-secondary: #5f5e5a;
  --text-tertiary: #8a8a85;
  --accent: #0f6e56;
  --accent-light: #e1f5ee;
  --accent-hover: #085041;
  --border: #d3d1c7;
  --border-light: #e8e6df;
  --white: #ffffff;
  --grade-a: #0f6e56;
  --grade-a-bg: #e1f5ee;
  --grade-b: #185fa5;
  --grade-b-bg: #e6f1fb;
  --grade-c: #ba7517;
  --grade-c-bg: #faeeda;
  --grade-d: #888780;
  --grade-d-bg: #f1efe8;
  --warn-bg: #faeeda;
  --warn-text: #854f0b;
  --warn-border: #f5c873;
  --font-serif: 'Noto Serif SC', Georgia, serif;
  --font-sans: 'Noto Sans SC', -apple-system, sans-serif;
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;
  --shadow-hover: 0 2px 12px rgba(42,42,40,0.06);
}
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.8;
  color: var(--text-primary);
  background: var(--bg-page);
  -webkit-font-smoothing: antialiased;
}
a { color: var(--accent); text-decoration: none; transition: color 0.2s; }
a:hover { color: var(--accent-hover); }
button { font-family: inherit; cursor: pointer; border: none; background: none; }

.container { max-width: 720px; margin: 0 auto; padding: 0 24px; }
.container-wide { max-width: 1080px; margin: 0 auto; padding: 0 24px; }

/* ===== Header ===== */
.site-header {
  border-bottom: 0.5px solid var(--border-light);
  position: sticky; top: 0; z-index: 100;
  background: rgba(245,243,239,0.92);
  backdrop-filter: blur(12px);
}
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 60px;
}
.logo {
  display: flex; align-items: center; gap: 10px;
  text-decoration: none; flex-shrink: 0;
}
.logo-icon { width: 28px; height: 28px; flex-shrink: 0; }
.logo-word { display: flex; flex-direction: column; line-height: 1.12; }
.logo-name { font-family: var(--font-serif); font-size: 19px; font-weight: 500; color: var(--text-primary); letter-spacing: 0.02em; }
.logo-domain { font-family: var(--font-sans); font-size: 10px; font-weight: 400; color: var(--text-tertiary); letter-spacing: 0.06em; margin-top: 1px; }
.nav-main { display: flex; gap: 28px; align-items: center; }
.nav-main a { font-size: 15px; color: var(--text-secondary); }
.nav-main a:hover { color: var(--accent); }
.header-actions { display: flex; align-items: center; gap: 16px; }
.search-toggle {
  width: 36px; height: 36px;
  display: flex; align-items: center; justify-content: center;
  border-radius: var(--radius-md); color: var(--text-secondary);
  transition: all 0.2s;
}
.search-toggle:hover { background: var(--bg-subtle); color: var(--accent); }
.about-link { font-size: 15px; color: var(--text-secondary); }

/* ===== Breadcrumb ===== */
.breadcrumb {
  padding: 20px 0;
  font-size: 13px;
  color: var(--text-tertiary);
}
.breadcrumb a { color: var(--text-tertiary); }
.breadcrumb a:hover { color: var(--accent); }
.breadcrumb span { margin: 0 6px; }

/* ===== Article Header ===== */
.article-header { padding: 8px 0 32px; border-bottom: 0.5px solid var(--border-light); margin-bottom: 40px; }
.article-category {
  font-size: 14px; color: var(--accent); font-weight: 500;
  margin-bottom: 12px;
}
.article-title {
  font-family: var(--font-serif);
  font-size: 30px; font-weight: 500; line-height: 1.4;
  color: var(--text-primary);
  margin-bottom: 16px;
  letter-spacing: -0.01em;
}
.article-meta {
  display: flex; align-items: center; gap: 16px; flex-wrap: wrap;
}
.grade-tag {
  font-size: 12px; font-weight: 500;
  padding: 2px 8px; border-radius: var(--radius-sm);
}
.grade-a { background: var(--grade-a-bg); color: var(--grade-a); }
.grade-b { background: var(--grade-b-bg); color: var(--grade-b); }
.grade-c { background: var(--grade-c-bg); color: var(--grade-c); }
.grade-d { background: var(--grade-d-bg); color: var(--grade-d); }
.meta-item { font-size: 13px; color: var(--text-tertiary); }

/* ===== Article Body ===== */
.article-body { font-size: 17px; line-height: 1.8; color: var(--text-primary); }
.article-body h2 {
  font-family: var(--font-serif);
  font-size: 22px; font-weight: 500;
  color: var(--text-primary);
  margin: 48px 0 16px;
  line-height: 1.4;
}
.article-body h2:first-child { margin-top: 0; }
.article-body h3 {
  font-size: 18px; font-weight: 500;
  color: var(--text-primary);
  margin: 32px 0 12px;
}
.article-body p { margin-bottom: 20px; }
.article-body strong { font-weight: 700; }
.article-body ul { margin: 0 0 20px 22px; }
.article-body li { margin-bottom: 10px; }
.article-body table { width: 100%; border-collapse: collapse; margin: 20px 0; font-size: 15px; }
.article-body th, .article-body td { border: 0.5px solid var(--border); padding: 10px 12px; text-align: left; }
.article-body th { background: var(--bg-subtle); font-weight: 500; }

/* ===== Callout ===== */
.callout {
  background: var(--bg-subtle);
  border-left: 3px solid var(--accent);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  padding: 16px 20px;
  margin: 24px 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--text-secondary);
}
.callout strong { color: var(--text-primary); }

/* ===== Warning Box ===== */
.warn-box {
  background: var(--warn-bg);
  border: 0.5px solid var(--warn-border);
  border-radius: var(--radius-lg);
  padding: 16px 20px;
  margin: 24px 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--warn-text);
}
.warn-box-title {
  font-weight: 500; margin-bottom: 4px;
  display: flex; align-items: center; gap: 6px;
}

/* ===== Timeline ===== */
.timeline { margin: 24px 0; }
.timeline-item {
  display: flex; gap: 16px; padding: 16px 0;
  border-bottom: 0.5px solid var(--border-light);
}
.timeline-item:last-child { border-bottom: none; }
.timeline-time {
  flex-shrink: 0; width: 80px;
  font-family: var(--font-serif); font-size: 15px; font-weight: 500;
  color: var(--accent);
}
.timeline-content { flex: 1; }
.timeline-content p { margin-bottom: 4px; font-size: 15px; line-height: 1.7; }
.timeline-content .detail { font-size: 14px; color: var(--text-secondary); }

/* ===== Myth List ===== */
.myth-list { margin: 24px 0; }
.myth-item {
  background: var(--bg-card);
  border: 0.5px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 20px;
  margin-bottom: 12px;
}
.myth-label {
  font-size: 13px; font-weight: 500;
  color: #a32d2d; margin-bottom: 6px;
}
.myth-statement {
  font-size: 15px; color: var(--text-secondary);
  text-decoration: line-through;
  margin-bottom: 8px;
}
.myth-truth {
  font-size: 15px; color: var(--text-primary);
  line-height: 1.7;
}
.myth-truth::before {
  content: '实际上：';
  font-weight: 500; color: var(--accent);
  margin-right: 4px;
}

/* ===== Source List ===== */
.source-list {
  background: var(--bg-subtle);
  border-radius: var(--radius-lg);
  padding: 24px;
  margin: 40px 0;
}
.source-list h3 {
  font-size: 15px; font-weight: 500;
  color: var(--text-primary);
  margin-bottom: 12px;
}
.source-list ol {
  padding-left: 20px;
  font-size: 14px; color: var(--text-secondary);
  line-height: 1.8;
}
.source-list li { margin-bottom: 4px; }

/* ===== Feedback ===== */
.feedback {
  text-align: center;
  padding: 40px 0;
  border-top: 0.5px solid var(--border-light);
  margin-top: 40px;
}
.feedback p { font-size: 15px; color: var(--text-secondary); margin-bottom: 16px; }
.feedback-buttons { display: flex; gap: 12px; justify-content: center; }
.feedback-btn {
  padding: 8px 24px;
  border: 0.5px solid var(--border);
  border-radius: var(--radius-md);
  font-size: 14px; color: var(--text-secondary);
  background: var(--bg-card);
  transition: all 0.2s;
}
.feedback-btn:hover { border-color: var(--accent); color: var(--accent); }
.feedback-btn.active { background: var(--accent-light); border-color: var(--accent); color: var(--accent); }

/* ===== Related ===== */
.related { padding: 40px 0; border-top: 0.5px solid var(--border-light); }
.related h2 {
  font-family: var(--font-serif);
  font-size: 20px; font-weight: 500;
  margin-bottom: 20px;
}
.related-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.related-card {
  background: var(--bg-card);
  border: 0.5px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 20px;
  transition: all 0.2s;
}
.related-card:hover { border-color: var(--accent); box-shadow: var(--shadow-hover); }
.related-card .card-category { font-size: 13px; color: var(--text-tertiary); margin-bottom: 6px; }
.related-card .card-title { font-family: var(--font-serif); font-size: 16px; font-weight: 500; line-height: 1.5; color: var(--text-primary); }
.related-card .card-footer { margin-top: 10px; display: flex; gap: 10px; align-items: center; }

/* ===== Disclaimer ===== */
.disclaimer {
  font-size: 13px; color: var(--text-tertiary);
  line-height: 1.7;
  padding: 20px 0;
  border-top: 0.5px solid var(--border-light);
}

/* ===== Footer ===== */
.site-footer {
  background: var(--bg-subtle);
  padding: 32px 0;
  border-top: 0.5px solid var(--border-light);
}
.footer-bottom {
  display: flex; justify-content: space-between; align-items: center;
  font-size: 12px; color: var(--text-tertiary);
}
.footer-disclaimer { max-width: 600px; line-height: 1.6; }
.beian { flex-basis: 100%; font-size: 12px; color: var(--text-tertiary); margin-top: 10px; line-height: 1.8; }
.beian a { color: var(--text-tertiary); text-decoration: none; }
.beian a:hover { color: var(--accent); }
.beian .beian-sep { margin: 0 6px; opacity: 0.6; }
.beian-mps { display: inline-flex; align-items: center; }
.beian-shield { width: 14px; height: 14px; margin-right: 4px; flex-shrink: 0; vertical-align: middle; }



/* ===== Responsive ===== */
@media (max-width: 768px) {
  .nav-main { display: none; }
  .article-title { font-size: 24px; }
  .article-body { font-size: 16px; }
  .article-body h2 { font-size: 20px; }
  .related-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; gap: 12px; }
  .timeline-time { width: 64px; font-size: 14px; }
}
@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
}