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

:root {
  --bg: #0f1117;
  --surface: #1a1d28;
  --text-primary: #e8eaed;
  --text-secondary: #9ca3af;
  --accent: #6c8cff;
  --accent-light: rgba(108, 140, 255, 0.12);
  --border: #2a2d3a;
  --radius: 12px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.3), 0 1px 2px rgba(0,0,0,0.4);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.4), 0 2px 6px rgba(0,0,0,0.3);
  --transition: 0.25s ease;
}

[data-theme="light"] {
  --bg: #f8f9fb;
  --surface: #ffffff;
  --text-primary: #1a1d23;
  --text-secondary: #6b7280;
  --accent: #4f6ef7;
  --accent-light: #eef1fe;
  --border: #e5e7eb;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.04), 0 1px 2px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.06), 0 2px 6px rgba(0,0,0,0.04);
}

html {
  -webkit-text-size-adjust: 100%;
  touch-action: manipulation;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  background: var(--bg);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  transition: background var(--transition), color var(--transition);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.container {
  max-width: 920px;
  margin: 0 auto;
  padding: 32px 16px;
}

header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 28px;
  gap: 12px;
  flex-wrap: wrap;
}

.header-left h1 {
  font-size: 1.5rem;
  font-weight: 800;
  letter-spacing: -0.5px;
  color: var(--text-primary);
}

.header-left .subtitle {
  color: var(--text-secondary);
  margin-top: 4px;
  font-size: 0.82rem;
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.theme-toggle {
  position: relative;
  width: 56px;
  height: 30px;
  flex-shrink: 0;
}

.theme-toggle input {
  opacity: 0;
  width: 0;
  height: 0;
  position: absolute;
}

.toggle-track {
  position: absolute;
  inset: 0;
  background: var(--border);
  border-radius: 30px;
  cursor: pointer;
  transition: background var(--transition);
}

.toggle-track::before {
  content: '';
  position: absolute;
  width: 22px;
  height: 22px;
  left: 4px;
  top: 50%;
  transform: translateY(-50%);
  background: var(--text-primary);
  border-radius: 50%;
  transition: transform var(--transition), background var(--transition);
}

.theme-toggle input:checked + .toggle-track {
  background: var(--accent);
}

.theme-toggle input:checked + .toggle-track::before {
  transform: translateY(-50%) translateX(26px);
  background: #fff;
}

.toggle-icons {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 7px;
  pointer-events: none;
  z-index: 1;
}

.toggle-icons svg {
  width: 14px;
  height: 14px;
  color: var(--text-secondary);
  transition: color var(--transition);
}

.controls {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 24px;
}

.search-box {
  position: relative;
}

.search-box svg {
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-secondary);
  pointer-events: none;
}

.search-box input {
  width: 100%;
  padding: 12px 16px 12px 44px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  font-size: 0.95rem;
  background: var(--surface);
  color: var(--text-primary);
  transition: border-color var(--transition), box-shadow var(--transition), background var(--transition);
  outline: none;
}

.search-box input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-light);
}

.filters {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

select {
  padding: 10px 36px 10px 14px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  font-size: 0.85rem;
  background: var(--surface) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%239ca3af' stroke-width='2.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='m6 9 6 6 6-6'/%3E%3C/svg%3E") no-repeat right 12px center;
  appearance: none;
  cursor: pointer;
  color: var(--text-primary);
  transition: border-color var(--transition), box-shadow var(--transition), background var(--transition);
  outline: none;
  min-width: 0;
  flex: 1 1 auto;
}

select:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-light);
}

.item-count {
  font-size: 0.85rem;
  color: var(--text-secondary);
  align-self: center;
  white-space: nowrap;
}

.items-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.card {
  background: var(--surface);
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 16px;
  transition: box-shadow var(--transition), border-color var(--transition), transform var(--transition), background var(--transition);
}

.card:hover {
  box-shadow: var(--shadow-md);
  border-color: #3d4155;
  transform: translateY(-1px);
}

[data-theme="light"] .card:hover {
  border-color: #d1d5db;
}

.card.visited {
  opacity: 0.45;
}

.card.visited .card-title a {
  color: var(--text-secondary);
}

.card.visited .card-source {
  background: transparent;
  color: var(--text-secondary);
}

.card-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 8px;
}

.card-title {
  font-size: 0.95rem;
  font-weight: 600;
  line-height: 1.4;
  min-width: 0;
  flex: 1;
}

.card-title a {
  color: var(--text-primary);
  text-decoration: none;
  transition: color var(--transition);
}

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

.card-source {
  display: inline-block;
  padding: 3px 10px;
  background: var(--accent-light);
  color: var(--accent);
  font-size: 0.7rem;
  font-weight: 600;
  border-radius: 20px;
  white-space: nowrap;
  flex-shrink: 0;
  max-width: 140px;
  overflow: hidden;
  text-overflow: ellipsis;
}

.card-summary {
  color: var(--text-secondary);
  font-size: 0.85rem;
  line-height: 1.55;
  margin-bottom: 12px;
}

.card-footer {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.78rem;
  color: var(--text-secondary);
}

.card-footer svg {
  width: 14px;
  height: 14px;
}

.empty-state {
  text-align: center;
  padding: 64px 24px;
  color: var(--text-secondary);
}

.empty-state p {
  font-size: 1rem;
}

.loading {
  text-align: center;
  padding: 80px 24px;
  color: var(--text-secondary);
}

.loading .spinner {
  width: 36px;
  height: 36px;
  border: 3px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  margin: 0 auto 16px;
  animation: spin 0.7s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

@media (max-width: 479px) {
  .filters {
    flex-direction: column;
    width: 100%;
  }

  select {
    width: 100%;
    font-size: 0.82rem;
    padding: 9px 36px 9px 12px;
  }

  .card-source {
    max-width: 100px;
    font-size: 0.65rem;
  }

  .item-count {
    align-self: flex-start;
  }
}

@media (min-width: 480px) {
  .container {
    padding: 40px 20px;
  }

  header {
    margin-bottom: 32px;
  }

  .header-left h1 {
    font-size: 1.65rem;
  }

  .controls {
    gap: 14px;
    margin-bottom: 28px;
  }

  .card {
    padding: 20px 18px;
  }

  .card-title {
    font-size: 1rem;
  }

  .card-summary {
    font-size: 0.88rem;
  }
}

@media (min-width: 640px) {
  .container {
    padding: 48px 24px;
  }

  header {
    margin-bottom: 40px;
  }

  .header-left h1 {
    font-size: 1.75rem;
  }

  .header-left .subtitle {
    font-size: 0.9rem;
  }

  .controls {
    flex-direction: row;
    align-items: center;
    gap: 16px;
    margin-bottom: 32px;
  }

  .search-box {
    flex: 1;
  }

  .filters {
    width: auto;
    min-width: 280px;
  }

  select {
    flex-shrink: 0;
  }

  .card {
    padding: 20px 24px;
  }

  .card-title {
    font-size: 1.05rem;
  }

  .card-summary {
    font-size: 0.9rem;
  }

  .card-footer {
    font-size: 0.8rem;
  }
}

@media (min-width: 768px) {
  .header-left h1 {
    font-size: 2rem;
  }
}