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

:root {
  --bg: #f0f2f5;
  --surface: #ffffff;
  --text: #1a1a2e;
  --text-secondary: #6b7280;
  --accent: #4f46e5;
  --accent-light: #eef2ff;
  --radius: 12px;
  --shadow: 0 2px 8px rgba(0,0,0,0.08);
  --shadow-hover: 0 8px 24px rgba(79,70,229,0.18);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
}

/* ── Hero ── */
.hero {
  background: linear-gradient(135deg, #4f46e5 0%, #7c3aed 50%, #a855f7 100%);
  padding: 48px 24px 36px;
  text-align: center;
  color: #fff;
}

.hero h1 { font-size: 2rem; font-weight: 700; letter-spacing: 0.02em; }
.hero p  { margin-top: 6px; opacity: 0.8; font-size: 0.95rem; }

.search-box {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 24px auto 0;
  max-width: 480px;
  background: rgba(255,255,255,0.95);
  border-radius: 50px;
  padding: 10px 20px;
  box-shadow: 0 4px 16px rgba(0,0,0,0.15);
  color: var(--text-secondary);
}

.search-box input {
  flex: 1;
  border: none;
  outline: none;
  font-size: 0.95rem;
  color: var(--text);
  background: transparent;
}

/* ── Category Nav ── */
.category-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: center;
  padding: 20px 24px 0;
}

.nav-btn {
  padding: 6px 18px;
  border-radius: 50px;
  border: 1.5px solid #d1d5db;
  background: var(--surface);
  color: var(--text-secondary);
  font-size: 0.85rem;
  cursor: pointer;
  transition: all 0.2s;
}

.nav-btn:hover { border-color: var(--accent); color: var(--accent); }
.nav-btn.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

/* ── Main ── */
main { max-width: 1100px; margin: 0 auto; padding: 24px 24px 48px; }

.category-section { margin-bottom: 36px; }

.category-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--accent);
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.category-title::before {
  content: '';
  display: inline-block;
  width: 4px;
  height: 16px;
  background: var(--accent);
  border-radius: 2px;
}

/* ── Site Grid ── */
.site-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 14px;
}

.site-card {
  display: flex;
  align-items: center;
  gap: 12px;
  background: var(--surface);
  border-radius: var(--radius);
  padding: 14px 16px;
  text-decoration: none;
  color: var(--text);
  box-shadow: var(--shadow);
  transition: transform 0.2s, box-shadow 0.2s;
  cursor: pointer;
}

.site-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-hover);
}

/* Icon: image or letter fallback */
.site-icon {
  position: relative;
  width: 40px;
  height: 40px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  font-weight: 700;
  color: #fff;
  flex-shrink: 0;
  overflow: hidden;
}

.site-icon img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; border-radius: 10px; }

.site-info { overflow: hidden; }
.site-name { font-size: 0.9rem; font-weight: 600; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.site-desc { font-size: 0.75rem; color: var(--text-secondary); margin-top: 3px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }

/* ── Empty state ── */
.empty-state {
  text-align: center;
  padding: 60px 24px;
  color: var(--text-secondary);
  font-size: 0.95rem;
}

/* ── Footer ── */
.footer {
  text-align: center;
  padding: 20px;
  font-size: 0.8rem;
  color: var(--text-secondary);
  border-top: 1px solid #e5e7eb;
}

.footer code {
  background: var(--accent-light);
  color: var(--accent);
  padding: 2px 7px;
  border-radius: 4px;
  font-family: "Fira Code", "Cascadia Code", monospace;
  font-size: 0.78rem;
}