:root {
  --primary: #c0392b;
  --primary-dark: #96281b;
  --secondary: #2c3e50;
  --accent: #e67e22;
  --bg: #f5f6fa;
  --card-bg: #ffffff;
  --text: #2d3436;
  --text-light: #636e72;
  --border: #dfe6e9;
  --nejm: #c0392b;
  --jama: #8e44ad;
  --annals: #e67e22;
  --resus: #27ae60;
  --ajem: #2980b9;
  --critcare: #16a085;
  --rct-bg: #fdf0f0;
  --meta-bg: #f0f4ff;
  --cohort-bg: #f0fff4;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Noto Sans TC', sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
}

/* ── Header ── */
header {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  color: white;
  padding: 0;
  box-shadow: 0 2px 8px rgba(0,0,0,0.2);
  position: sticky;
  top: 0;
  z-index: 100;
}
.header-inner {
  max-width: 1100px;
  margin: auto;
  padding: 16px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
}
.logo { display: flex; align-items: center; gap: 12px; }
.logo h1 { font-size: 22px; font-weight: 700; letter-spacing: 0.5px; }
.logo span { font-size: 15px; opacity: 0.85; }
.nav a {
  color: rgba(255,255,255,0.85);
  text-decoration: none;
  margin-left: 20px;
  font-size: 16px;
  transition: color 0.2s;
}
.nav a:hover { color: white; }

/* ── Hero ── */
.hero {
  background: white;
  border-bottom: 1px solid var(--border);
  padding: 28px 24px;
}
.hero-inner {
  max-width: 1100px;
  margin: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}
.week-label {
  font-size: 15px;
  color: var(--text-light);
  margin-bottom: 4px;
}
.week-title { font-size: 20px; font-weight: 700; color: var(--secondary); }
.stats { display: flex; gap: 20px; flex-wrap: wrap; }
.stat { text-align: center; }
.stat-num { font-size: 28px; font-weight: 700; color: var(--primary); line-height: 1; }
.stat-label { font-size: 14px; color: var(--text-light); margin-top: 2px; }

/* ── Filter Bar ── */
.filter-bar {
  max-width: 1100px;
  margin: 20px auto 0;
  padding: 0 24px;
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  align-items: center;
}
.filter-btn {
  border: 1px solid var(--border);
  background: white;
  padding: 6px 14px;
  border-radius: 20px;
  font-size: 15px;
  cursor: pointer;
  transition: all 0.2s;
  color: var(--text);
}
.filter-btn:hover { border-color: var(--primary); color: var(--primary); }
.filter-btn.active { background: var(--primary); color: white; border-color: var(--primary); }
.filter-label { font-size: 15px; color: var(--text-light); margin-right: 4px; }

/* ── Main Layout ── */
main {
  max-width: 1100px;
  margin: 24px auto 60px;
  padding: 0 24px;
}

/* ── Article Card ── */
.article-card {
  background: var(--card-bg);
  border-radius: 12px;
  border: 1px solid var(--border);
  margin-bottom: 20px;
  overflow: hidden;
  transition: box-shadow 0.2s;
}
.article-card:hover { box-shadow: 0 4px 20px rgba(0,0,0,0.08); }

.card-header {
  padding: 18px 20px 14px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: flex-start;
  gap: 14px;
}
.rank-badge {
  background: var(--primary);
  color: white;
  font-size: 15px;
  font-weight: 700;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  margin-top: 2px;
}
.card-meta { flex: 1; }
.journal-row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 6px;
  flex-wrap: wrap;
}
.journal-tag {
  font-size: 13px;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 4px;
  color: white;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}
.tag-nejm { background: var(--nejm); }
.tag-jama { background: var(--jama); }
.tag-lancet { background: #555; }
.tag-annals { background: var(--annals); }
.tag-resus { background: var(--resus); }
.tag-ajem { background: var(--ajem); }
.tag-critcare { background: var(--critcare); }
.tag-other { background: #95a5a6; }

.study-type {
  font-size: 13px;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 4px;
  border: 1px solid;
}
.type-rct { color: #c0392b; border-color: #c0392b; background: #fdf0f0; }
.type-meta { color: #8e44ad; border-color: #8e44ad; background: #f5f0ff; }
.type-cohort { color: #27ae60; border-color: #27ae60; background: #f0fff4; }
.type-secondary { color: #e67e22; border-color: #e67e22; background: #fff8f0; }

.pub-date { font-size: 14px; color: var(--text-light); }
.article-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--secondary);
  line-height: 1.4;
  margin-bottom: 6px;
}
.article-authors { font-size: 14px; color: var(--text-light); }
.pmid-link {
  display: inline-block;
  margin-top: 4px;
  font-size: 14px;
  color: var(--primary);
  text-decoration: none;
}
.pmid-link:hover { text-decoration: underline; }

/* ── Sections (always expanded) ── */
.card-sections { padding: 4px 0; }
.section {
  border-top: 1px solid var(--border);
}
.section-header {
  padding: 14px 20px 6px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.section-icon { font-size: 18px; }
.section-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--secondary);
}
.section-body {
  display: block;
  padding: 2px 20px 16px 20px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--text);
}

/* ── Conclusion Box ── */
.conclusion-box {
  background: linear-gradient(135deg, #fff9f9, #fff0f0);
  border: 1px solid #f5c6c6;
  border-radius: 8px;
  padding: 14px 16px;
  margin: 8px 0 0;
}
.conclusion-box h4 { color: var(--primary); font-size: 15px; margin-bottom: 6px; }
.conclusion-box p { font-size: 16px; line-height: 1.7; }

/* ── Pros/Cons ── */
.pros-cons {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-top: 8px;
}
.pros, .cons {
  background: #f8f9fa;
  border-radius: 8px;
  padding: 12px 14px;
}
.pros h4 { color: #27ae60; font-size: 15px; margin-bottom: 8px; }
.cons h4 { color: #e74c3c; font-size: 15px; margin-bottom: 8px; }
.pros ul, .cons ul { padding-left: 16px; font-size: 15px; }
.pros li { color: #27ae60; margin-bottom: 4px; }
.pros li span { color: var(--text); }
.cons li { color: #e74c3c; margin-bottom: 4px; }
.cons li span { color: var(--text); }

@media (max-width: 600px) {
  .pros-cons { grid-template-columns: 1fr; }
  .header-inner { padding: 12px 16px; }
  .logo h1 { font-size: 18px; }
  main { padding: 0 16px; }
  .article-title { font-size: 17px; }
}

/* ── Footer ── */
footer {
  background: var(--secondary);
  color: rgba(255,255,255,0.7);
  text-align: center;
  padding: 24px;
  font-size: 15px;
  margin-top: 40px;
}
footer a { color: rgba(255,255,255,0.85); }

/* ── Archive Page ── */
.archive-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 16px;
  margin-top: 24px;
}
.archive-card {
  background: white;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 18px;
  text-decoration: none;
  color: var(--text);
  transition: all 0.2s;
  display: block;
}
.archive-card:hover { border-color: var(--primary); box-shadow: 0 4px 12px rgba(0,0,0,0.08); }
.archive-week { font-size: 14px; color: var(--text-light); margin-bottom: 6px; }
.archive-count { font-size: 24px; font-weight: 700; color: var(--primary); }
.archive-label { font-size: 14px; color: var(--text-light); }