/* === Reset & Base === */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg: #0f1117;
  --bg-card: #1a1d27;
  --bg-header: #141620;
  --text: #e2e4e9;
  --text-dim: #8b8fa3;
  --accent: #4a90d9;
  --accent-light: #5ea3ec;
  --tag-bg: #252836;
  --tag-active: #4a90d9;
  --border: #2a2d3a;
  --timeline-line: #2a2d3a;
  --danger: #e05555;
  --warning: #e0a830;
  --success: #4caf50;
  --radius: 8px;
  --max-width: 800px;
}

html { font-size: 16px; -webkit-font-smoothing: antialiased; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Noto Sans SC", "Noto Sans", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
}

.container { max-width: var(--max-width); margin: 0 auto; padding: 0 20px; }

a { color: var(--accent-light); text-decoration: none; }
a:hover { text-decoration: underline; }

/* === Language Toggle === */
.lang-toggle { display: flex; gap: 0; border-radius: 6px; overflow: hidden; border: 1px solid var(--border); }
.lang-btn {
  padding: 6px 14px;
  background: transparent;
  color: var(--text-dim);
  border: none;
  cursor: pointer;
  font-size: 0.85rem;
  transition: all 0.2s;
}
.lang-btn.active { background: var(--accent); color: #fff; }

/* === Header === */
.site-header {
  background: var(--bg-header);
  border-bottom: 1px solid var(--border);
  padding: 28px 0 20px;
}
.header-top { display: flex; justify-content: space-between; align-items: center; }
.site-title { font-size: 1.5rem; font-weight: 700; letter-spacing: -0.02em; }
.site-desc { color: var(--text-dim); font-size: 0.9rem; margin-top: 8px; }

/* === Filter Bar === */
.filter-bar {
  background: var(--bg-card);
  border-bottom: 1px solid var(--border);
  padding: 12px 0;
  position: sticky;
  top: 0;
  z-index: 100;
}
.filter-bar .container { display: flex; justify-content: space-between; align-items: center; gap: 16px; }
.filter-tags { display: flex; gap: 8px; flex-wrap: wrap; flex: 1; }
.filter-tag {
  padding: 4px 14px;
  border-radius: 20px;
  border: 1px solid var(--border);
  background: var(--tag-bg);
  color: var(--text-dim);
  font-size: 0.8rem;
  cursor: pointer;
  transition: all 0.2s;
  white-space: nowrap;
}
.filter-tag:hover { border-color: var(--accent); color: var(--text); }
.filter-tag.active { background: var(--tag-active); color: #fff; border-color: var(--tag-active); }
.filter-status { color: var(--text-dim); font-size: 0.85rem; white-space: nowrap; }

/* === Timeline === */
.timeline { position: relative; padding: 32px 0; }
.timeline::before {
  content: '';
  position: absolute;
  left: 20px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--timeline-line);
}

/* === Digest Card === */
.digest-card {
  position: relative;
  margin-left: 44px;
  margin-bottom: 28px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  transition: border-color 0.2s;
}
.digest-card:hover { border-color: var(--accent); }

.digest-card::before {
  content: '';
  position: absolute;
  left: -32px;
  top: 24px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--accent);
  border: 2px solid var(--bg);
}

.digest-date {
  font-size: 0.8rem;
  color: var(--text-dim);
  margin-bottom: 8px;
  font-family: "SF Mono", "Fira Code", monospace;
}
.digest-title {
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: 12px;
  line-height: 1.4;
}
.digest-tags { display: flex; gap: 6px; flex-wrap: wrap; margin-bottom: 12px; }
.digest-tag {
  padding: 2px 10px;
  border-radius: 12px;
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.digest-tag.military { background: rgba(224, 85, 85, 0.15); color: var(--danger); }
.digest-tag.diplomacy { background: rgba(74, 144, 217, 0.15); color: var(--accent); }
.digest-tag.economy { background: rgba(224, 168, 48, 0.15); color: var(--warning); }
.digest-tag.politics { background: rgba(76, 175, 80, 0.15); color: var(--success); }
.digest-tag.default { background: var(--tag-bg); color: var(--text-dim); }

.digest-content { line-height: 1.7; }
.digest-content h2 { font-size: 1rem; margin: 16px 0 8px; color: var(--accent-light); }
.digest-content ul, .digest-content ol { padding-left: 20px; margin: 8px 0; }
.digest-content li { margin-bottom: 4px; }
.digest-content p { margin-bottom: 8px; }

.digest-sources {
  margin-top: 16px;
  padding-top: 12px;
  border-top: 1px solid var(--border);
}
.digest-sources-title {
  font-size: 0.78rem;
  color: var(--text-dim);
  margin-bottom: 6px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.digest-sources a {
  font-size: 0.82rem;
  margin-right: 12px;
}

/* === Loading / Empty === */
.loading, .empty-state {
  text-align: center;
  padding: 60px 0;
  color: var(--text-dim);
}
.spinner {
  width: 28px;
  height: 28px;
  border: 3px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin: 0 auto 12px;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* === Load More === */
.load-more-wrap { text-align: center; padding: 20px 0 40px; }
.load-more-btn {
  padding: 10px 32px;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--bg-card);
  color: var(--text);
  cursor: pointer;
  font-size: 0.9rem;
  transition: all 0.2s;
}
.load-more-btn:hover { border-color: var(--accent); background: var(--tag-bg); }

/* === Footer === */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 24px 0;
  text-align: center;
  color: var(--text-dim);
  font-size: 0.85rem;
}

/* === i18n visibility === */
[data-lang="zh"] .lang-en { display: none; }
[data-lang="en"] .lang-zh { display: none; }

/* === Responsive === */
@media (max-width: 600px) {
  .site-title { font-size: 1.2rem; }
  .digest-card { margin-left: 36px; padding: 16px; }
  .timeline::before { left: 14px; }
  .digest-card::before { left: -28px; }
  .filter-bar .container { flex-direction: column; align-items: flex-start; }
}