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

:root {
  --bg: #f5f5f0;
  --surface: #ffffff;
  --border: #e2e2dc;
  --text: #1a1a1a;
  --muted: #6b6b6b;
  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --tag-bg: #eff6ff;
  --tag-text: #1d4ed8;
  --radius: 8px;
  --shadow: 0 1px 3px rgba(0,0,0,0.08);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111113;
    --surface: #1c1c1f;
    --border: #2e2e33;
    --text: #ededef;
    --muted: #888890;
    --accent: #60a5fa;
    --accent-hover: #93c5fd;
    --tag-bg: #1e2d45;
    --tag-text: #93c5fd;
  }
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
}

header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 1rem 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 10;
}

header h1 {
  font-size: 1.25rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}

#refresh-btn {
  background: none;
  border: 1px solid var(--border);
  color: var(--text);
  padding: 0.4rem 0.9rem;
  border-radius: var(--radius);
  cursor: pointer;
  font-size: 0.875rem;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  transition: background 0.15s, border-color 0.15s;
}

#refresh-btn:hover { background: var(--bg); border-color: var(--muted); }
#refresh-btn.spinning svg { animation: spin 1s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }

#category-tabs {
  padding: 0.75rem 2rem 0;
  display: flex;
  gap: 0.25rem;
  flex-wrap: wrap;
  border-bottom: 1px solid var(--border);
  background: var(--surface);
}

.category-tab {
  padding: 0.5rem 1rem;
  border: none;
  border-bottom: 2px solid transparent;
  background: transparent;
  color: var(--muted);
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  cursor: pointer;
  transition: color 0.15s, border-color 0.15s;
  margin-bottom: -1px;
  white-space: nowrap;
}

.category-tab:hover { color: var(--text); }
.category-tab.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

#feed-tabs {
  padding: 1rem 2rem 0;
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.tab {
  padding: 0.4rem 1rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--muted);
  font-size: 0.875rem;
  cursor: pointer;
  transition: all 0.15s;
  white-space: nowrap;
}

.tab:hover { color: var(--text); border-color: var(--muted); }
.tab.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
  font-weight: 500;
}

main {
  max-width: 780px;
  margin: 1.5rem auto;
  padding: 0 1.5rem;
}

.feed-section { display: none; }
.feed-section.active { display: block; }

.feed-header {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.feed-header h2 {
  font-size: 1.1rem;
  font-weight: 600;
}

.feed-count {
  font-size: 0.8rem;
  color: var(--muted);
}

.items-list {
  display: flex;
  flex-direction: column;
  gap: 1px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--border);
  box-shadow: var(--shadow);
}

.item {
  background: var(--surface);
  padding: 1rem 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  transition: background 0.1s;
}

.item:hover { background: var(--bg); }

.item-title a,
.item-title span {
  color: var(--text);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.95rem;
  line-height: 1.4;
}

.item-title a:hover { color: var(--accent); }

.item-meta {
  font-size: 0.8rem;
  color: var(--muted);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.item-meta .dot { opacity: 0.4; }

.item-desc {
  font-size: 0.85rem;
  color: var(--muted);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* States */
.state {
  padding: 3rem 1rem;
  text-align: center;
  color: var(--muted);
  font-size: 0.9rem;
}

.state svg {
  display: block;
  margin: 0 auto 0.75rem;
  opacity: 0.4;
}

.spinner {
  width: 32px;
  height: 32px;
  border: 2px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin: 0 auto 0.75rem;
}

.error-msg {
  color: #dc2626;
  font-size: 0.85rem;
  margin-top: 0.5rem;
}