:root {
  --bg-deep: #0c0e14;
  --bg-card: rgba(22, 26, 38, 0.85);
  --border: rgba(255, 255, 255, 0.08);
  --text: #e8eaef;
  --text-muted: #8b92a8;
  --accent: #6c9eff;
  --accent-soft: rgba(108, 158, 255, 0.15);
  --glow: rgba(108, 158, 255, 0.35);
  --radius: 14px;
  --font: "Noto Sans SC", system-ui, sans-serif;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font);
  color: var(--text);
  background: var(--bg-deep);
  line-height: 1.5;
}

.bg-gradient {
  position: fixed;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(ellipse 80% 50% at 50% -20%, rgba(108, 158, 255, 0.22), transparent),
    radial-gradient(ellipse 60% 40% at 100% 50%, rgba(168, 85, 247, 0.12), transparent),
    radial-gradient(ellipse 50% 30% at 0% 80%, rgba(34, 211, 238, 0.08), transparent),
    var(--bg-deep);
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.site-header {
  padding: 3rem 1.5rem 2rem;
  text-align: center;
}

.header-inner {
  max-width: 640px;
  margin: 0 auto;
}

.logo {
  margin: 0 0 0.5rem;
  font-size: clamp(1.75rem, 4vw, 2.25rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  background: linear-gradient(135deg, #fff 0%, #a8c4ff 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.tagline {
  margin: 0 0 1.75rem;
  color: var(--text-muted);
  font-size: 0.95rem;
}

.search-wrap {
  max-width: 400px;
  margin: 0 auto;
}

.search-input {
  width: 100%;
  padding: 0.85rem 1.1rem;
  font: inherit;
  font-size: 0.95rem;
  color: var(--text);
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.search-input::placeholder {
  color: var(--text-muted);
}

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

.main {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 1.25rem 3rem;
}

.toolbar {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.25rem;
  padding: 0 0.15rem;
}

.toolbar-label {
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
}

.count {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.category-grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1rem;
}

.category-card {
  position: relative;
  display: block;
  padding: 1.35rem 1.25rem;
  text-decoration: none;
  color: inherit;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  backdrop-filter: blur(12px);
  transition: transform 0.2s, border-color 0.2s, box-shadow 0.2s;
  overflow: hidden;
}

.category-card::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, var(--card-tint, var(--accent-soft)) 0%, transparent 55%);
  opacity: 0.6;
  pointer-events: none;
}

.category-card:hover,
.category-card:focus-visible {
  transform: translateY(-2px);
  border-color: rgba(108, 158, 255, 0.35);
  box-shadow: 0 12px 40px -12px var(--glow);
  outline: none;
}

.category-card:focus-visible {
  box-shadow: 0 0 0 2px var(--bg-deep), 0 0 0 4px var(--accent);
}

.card-icon {
  font-size: 1.75rem;
  line-height: 1;
  margin-bottom: 0.65rem;
  display: block;
}

.card-title {
  margin: 0 0 0.35rem;
  font-size: 1.1rem;
  font-weight: 600;
}

.card-desc {
  margin: 0;
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.45;
}

.card-meta {
  margin-top: 0.85rem;
  font-size: 0.75rem;
  color: var(--accent);
  font-weight: 500;
}

.empty {
  text-align: center;
  padding: 2.5rem 1rem;
  color: var(--text-muted);
  font-size: 0.95rem;
}

.empty.hidden {
  display: none;
}

.site-footer {
  text-align: center;
  padding: 1.5rem;
  font-size: 0.8rem;
  color: var(--text-muted);
  border-top: 1px solid var(--border);
}

.site-footer code {
  font-size: 0.9em;
  color: var(--accent);
}

@media (max-width: 480px) {
  .site-header {
    padding-top: 2rem;
  }

  .category-grid {
    grid-template-columns: 1fr;
  }
}