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

:root {
  --bg: #f9f9f9;
  --surface: #ffffff;
  --border: #e5e7eb;
  --text: #111827;
  --text-muted: #6b7280;
  --accent: #2563eb;
  --accent-light: #eff6ff;
  --radius: 10px;
  --shadow: 0 1px 3px rgba(0,0,0,.08);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1117;
    --surface: #1a1d27;
    --border: #2d3148;
    --text: #f1f5f9;
    --text-muted: #94a3b8;
    --accent: #60a5fa;
    --accent-light: #1e3a5f;
  }
}

body {
  font-family: 'Inter', system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  font-size: 15px;
}

.container {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 16px;
}

/* Header */
header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 16px 0;
  position: sticky;
  top: 0;
  z-index: 10;
}

header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

h1 {
  font-size: 18px;
  font-weight: 600;
  letter-spacing: -0.3px;
}

.stats {
  font-size: 12px;
  color: var(--text-muted);
}

/* Tabs */
.tabs {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 0;
  position: sticky;
  top: 57px;
  z-index: 9;
}

.tabs .container {
  display: flex;
  gap: 2px;
  overflow-x: auto;
  scrollbar-width: none;
  padding: 8px 16px;
}

.tabs .container::-webkit-scrollbar { display: none; }

.tab {
  background: none;
  border: none;
  padding: 6px 14px;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-muted);
  cursor: pointer;
  white-space: nowrap;
  transition: background .15s, color .15s;
}

.tab:hover { background: var(--border); color: var(--text); }
.tab.active { background: var(--accent); color: #fff; }

/* Feed */
main { padding: 20px 16px 60px; }

#feed { display: flex; flex-direction: column; gap: 12px; }

/* Card */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 18px;
  box-shadow: var(--shadow);
  transition: box-shadow .15s;
}

.card:hover { box-shadow: 0 4px 12px rgba(0,0,0,.12); }

.card-title {
  font-size: 17px;
  font-weight: 600;
  line-height: 1.4;
  margin-bottom: 6px;
  color: var(--text);
}

.card-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 8px;
  flex-wrap: wrap;
}

.badge {
  font-size: 11px;
  font-weight: 500;
  padding: 2px 8px;
  border-radius: 20px;
  background: var(--accent-light);
  color: var(--accent);
}

.card-date {
  font-size: 12px;
  color: var(--text-muted);
}

.card-summary {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.65;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
  margin-bottom: 10px;
}

.card-link {
  font-size: 13px;
  color: var(--accent);
  text-decoration: none;
  font-weight: 500;
}

.card-link:hover { text-decoration: underline; }

/* States */
.loading, .empty {
  text-align: center;
  padding: 40px 0;
  color: var(--text-muted);
  font-size: 14px;
}

.hidden { display: none !important; }

#sentinel { height: 1px; }