:root {
  --bg: #f5f5f5;
  --fg: #333;
  --fg-muted: #666;
  --bg-card: white;
  --bg-header: #e8e8e8;
  --border: #ddd;
  --link: #0066cc;
  --link-hover: #007acc;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #1a1a1a;
    --fg: #e0e0e0;
    --fg-muted: #999;
    --bg-card: #252525;
    --bg-header: #2d2d2d;
    --border: #444;
    --link: #4a9eff;
    --link-hover: #6bb3ff;
  }
}

* {
  box-sizing: border-box;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  margin: 0;
  padding: 20px;
  background: var(--bg);
  color: var(--fg);
  max-width: 1200px;
  margin: 0 auto;
  line-height: 1.5;
}

h1 {
  margin: 0 0 1rem;
  text-align: center;
}

header {
  text-align: center;
  margin-bottom: 2rem;
  color: var(--fg-muted);
  font-size: 0.9rem;
}

a {
  color: var(--link);
  text-decoration: none;
}

a:hover {
  color: var(--link-hover);
  text-decoration: underline;
}

input {
  padding: 0.5rem;
  border: 1px solid var(--border);
  border-radius: 4px;
  font-size: 1rem;
  background: var(--bg-card);
  color: var(--fg);
  width: 100%;
  max-width: 400px;
}

input:focus {
  outline: 2px solid var(--link);
  outline-offset: 2px;
}

table {
  width: 100%;
  border-collapse: collapse;
  background: var(--bg-card);
  border-radius: 4px;
  overflow: hidden;
}

th {
  background: var(--bg-header);
  color: var(--fg);
  padding: 0.75rem;
  text-align: left;
  font-weight: 600;
  border-bottom: 2px solid var(--border);
}

td {
  padding: 0.75rem;
  border-top: 1px solid var(--border);
}

td:has(.badge) {
  white-space: nowrap;
}

tr:first-child td {
  border-top: none;
}

.hidden {
  display: none;
}

.muted {
  color: var(--fg-muted);
  font-size: 0.9rem;
}

.badge {
  display: inline-block;
  padding: 0.25rem 0.5rem;
  border-radius: 3px;
  font-size: 0.85rem;
  margin-right: 0.5rem;
  color: white;
}

.badge-rss {
  background: #ff6600;
}

.badge-atom {
  background: #666;
}

.container {
  max-width: 800px;
  margin: 0 auto;
  background: var(--bg-card);
  padding: 1.5rem;
  border-radius: 8px;
}

.container h1 {
  text-align: left;
  border-bottom: 2px solid var(--link);
  padding-bottom: 0.5rem;
  margin-bottom: 1.5rem;
}

.item {
  margin: 1.5rem 0;
  padding: 1rem;
  border-left: 4px solid var(--link);
  background: var(--bg);
}

.item-title {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.item-date {
  color: var(--fg-muted);
  font-size: 0.9rem;
  margin-bottom: 0.5rem;
}

.item-content {
  line-height: 1.6;
}

.item-content img {
  max-width: 100%;
  height: auto;
}

@media (max-width: 768px) {
  th {
    display: none;
  }

  td {
    display: block;
    padding: 0.5rem;
    border-top: none;
    border-bottom: 1px solid var(--border);
  }

  td:last-child {
    border-bottom: none;
  }

  td::before {
    content: attr(data-label) ": ";
    font-weight: 600;
    display: inline-block;
    min-width: 100px;
  }
}