:root {
  --bg: #f5f6f8;
  --card-bg: #ffffff;
  --text: #1f2430;
  --muted: #6b7280;
  --accent: #2563eb;
  --border: #e2e5ea;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, "Segoe UI", "Malgun Gothic", "Apple SD Gothic Neo", sans-serif;
  background: var(--bg);
  color: var(--text);
}

header {
  position: sticky;
  top: 0;
  background: var(--card-bg);
  border-bottom: 1px solid var(--border);
  padding: 1.25rem 1rem;
  text-align: center;
  z-index: 10;
}

header h1 {
  margin: 0 0 0.25rem;
  font-size: 1.4rem;
}

.subtitle {
  margin: 0 0 0.75rem;
  color: var(--muted);
  font-size: 0.9rem;
}

#search-input {
  width: 100%;
  max-width: 600px;
  padding: 0.7rem 1rem;
  font-size: 1rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  outline: none;
}

#search-input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 2px rgba(37, 99, 235, 0.15);
}

.result-count {
  margin-top: 0.5rem;
  font-size: 0.85rem;
  color: var(--muted);
}

main {
  max-width: 800px;
  margin: 0 auto;
  padding: 1rem;
}

.card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1rem 1.2rem;
  margin-bottom: 0.9rem;
}

.card-title {
  font-size: 1.05rem;
  font-weight: 600;
  margin: 0 0 0.3rem;
}

.card-category {
  font-size: 0.78rem;
  color: var(--accent);
  background: #eef2ff;
  display: inline-block;
  padding: 0.15rem 0.5rem;
  border-radius: 999px;
  margin-bottom: 0.5rem;
}

.card-summary {
  font-size: 0.92rem;
  line-height: 1.5;
  margin: 0.4rem 0 0.6rem;
}

.card-meta {
  font-size: 0.78rem;
  color: var(--muted);
  margin-bottom: 0.5rem;
}

.keywords {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  margin-bottom: 0.6rem;
}

.keyword {
  font-size: 0.75rem;
  background: #f1f2f4;
  color: var(--muted);
  padding: 0.15rem 0.5rem;
  border-radius: 999px;
}

.card-link {
  display: inline-block;
  font-size: 0.85rem;
  color: var(--accent);
  text-decoration: none;
}

.card-link.disabled {
  color: var(--muted);
  pointer-events: none;
}

.empty {
  text-align: center;
  color: var(--muted);
  padding: 3rem 1rem;
}

footer {
  text-align: center;
  color: var(--muted);
  font-size: 0.8rem;
  padding: 1.5rem 1rem 2.5rem;
}