/* HtmlHub — 深色主题移动优先 */

:root {
  --bg: #0f0f1a;
  --card-bg: #1a1a2e;
  --card-hover: #252545;
  --text: #e8e8f0;
  --text-dim: #8888aa;
  --accent: #6c63ff;
  --accent-glow: rgba(108, 99, 255, 0.3);
  --radius: 12px;
  --gap: 16px;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  padding: 20px 16px 80px;
  -webkit-font-smoothing: antialiased;
}

/* Header */
header {
  text-align: center;
  padding: 24px 0 8px;
}
header h1 {
  font-size: 24px;
  font-weight: 700;
}
header .subtitle {
  color: var(--text-dim);
  font-size: 13px;
  margin-top: 4px;
}

/* Views */
.view { display: none; }
.view.active { display: block; }

/* Category Grid */
.category-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--gap);
  margin-top: 24px;
}

.category-card {
  background: var(--card-bg);
  border-radius: var(--radius);
  padding: 20px 16px;
  cursor: pointer;
  transition: all 0.2s;
  border: 1px solid transparent;
}
.category-card:hover, .category-card:active {
  background: var(--card-hover);
  border-color: var(--accent);
  transform: translateY(-2px);
  box-shadow: 0 4px 20px var(--accent-glow);
}

.card-icon {
  font-size: 32px;
  margin-bottom: 8px;
}
.card-name {
  font-size: 15px;
  font-weight: 600;
}
.card-count {
  font-size: 12px;
  color: var(--accent);
  margin-top: 4px;
}
.card-desc {
  font-size: 11px;
  color: var(--text-dim);
  margin-top: 6px;
  line-height: 1.4;
}

/* Back bar */
.back-bar {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 16px;
  margin-bottom: 12px;
}
.back-bar button {
  background: var(--card-bg);
  color: var(--text);
  border: none;
  padding: 8px 16px;
  border-radius: 8px;
  font-size: 14px;
  cursor: pointer;
}
.back-bar h2 {
  font-size: 18px;
}

/* Sub sections */
.sub-section {
  margin-bottom: 20px;
}
.sub-section h3 {
  font-size: 15px;
  color: var(--text-dim);
  margin-bottom: 10px;
  padding-left: 4px;
}

/* File list */
.file-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.file-item {
  display: block;
  background: var(--card-bg);
  border-radius: var(--radius);
  padding: 14px 16px;
  text-decoration: none;
  color: var(--text);
  transition: all 0.2s;
  border: 1px solid transparent;
}
.file-item:hover, .file-item:active {
  border-color: var(--accent);
  background: var(--card-hover);
}

.file-title {
  font-size: 14px;
  font-weight: 500;
}
.file-meta {
  font-size: 12px;
  color: var(--text-dim);
  margin-top: 4px;
}

/* Footer */
footer {
  text-align: center;
  margin-top: 40px;
  padding: 16px 0;
  color: var(--text-dim);
  font-size: 12px;
  border-top: 1px solid rgba(255,255,255,0.05);
}

/* Desktop */
@media (min-width: 768px) {
  .category-grid {
    grid-template-columns: repeat(4, 1fr);
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
  }
  .file-list {
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
  }
}