:root {
  --bg: #f5f6f8;
  --surface: #ffffff;
  --text: #1a1d23;
  --text-dim: #5c6270;
  --border: #e3e5e9;
  --accent: #2563eb;
  --accent-soft: #eaf0fe;
  --radius: 14px;
  --shadow: 0 1px 3px rgba(20, 20, 30, 0.06), 0 1px 2px rgba(20, 20, 30, 0.04);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14161c;
    --surface: #1c1f27;
    --text: #eef0f4;
    --text-dim: #9aa1b0;
    --border: #2b2f3a;
    --accent: #6b9bff;
    --accent-soft: #1e2a47;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.3), 0 1px 2px rgba(0, 0, 0, 0.2);
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
}

header.hub-header {
  padding: 48px 24px 28px;
  text-align: center;
}

header.hub-header h1 {
  margin: 0 0 8px;
  font-size: clamp(24px, 4vw, 34px);
  font-weight: 700;
}

header.hub-header p {
  margin: 0;
  color: var(--text-dim);
  font-size: 15px;
}

.controls {
  max-width: 860px;
  margin: 28px auto 0;
  padding: 0 24px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

#search {
  width: 100%;
  padding: 13px 16px;
  font-size: 15px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--text);
  outline: none;
}

#search:focus {
  border-color: var(--accent);
}

.categories {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: center;
}

.chip {
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text-dim);
  padding: 7px 14px;
  border-radius: 999px;
  font-size: 13.5px;
  cursor: pointer;
  transition: all 0.15s ease;
}

.chip:hover {
  border-color: var(--accent);
  color: var(--accent);
}

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

main {
  max-width: 1080px;
  margin: 0 auto;
  padding: 36px 24px 80px;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 16px;
}

.card {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 20px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  text-decoration: none;
  color: inherit;
  transition: transform 0.12s ease, box-shadow 0.12s ease, border-color 0.12s ease;
}

.card:hover {
  transform: translateY(-2px);
  border-color: var(--accent);
  box-shadow: 0 6px 18px rgba(37, 99, 235, 0.12);
}

.card .icon {
  font-size: 26px;
}

.card h3 {
  margin: 0;
  font-size: 16px;
  font-weight: 600;
}

.card p {
  margin: 0;
  font-size: 13.5px;
  color: var(--text-dim);
  flex-grow: 1;
}

.card .badge {
  align-self: flex-start;
  font-size: 11.5px;
  color: var(--accent);
  background: var(--accent-soft);
  padding: 3px 9px;
  border-radius: 999px;
}

.empty {
  text-align: center;
  color: var(--text-dim);
  padding: 60px 20px;
}

footer {
  text-align: center;
  padding: 24px;
  color: var(--text-dim);
  font-size: 12.5px;
}