:root {
  --bg: #0f1720;
  --panel: #18222d;
  --text: #e8eef5;
  --muted: #a8b6c6;
  --border: #314253;
  --accent: #4cc9f0;
  --good: #39d353;
  --solved: #ffb700;
  --shadow: 0 12px 30px rgba(0, 0, 0, 0.28);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Inter, system-ui, Arial, sans-serif;
  background:
    radial-gradient(circle at top, #183248 0%, #0f1720 45%),
    #0f1720;
  color: var(--text);
}

.container {
  max-width: 1050px;
  margin: 0 auto;
  padding: 48px 20px;
}

.hero {
  background: rgba(24, 34, 45, 0.92);
  border: 1px solid var(--border);
  border-radius: 22px;
  box-shadow: var(--shadow);
  padding: 34px;
  margin-bottom: 24px;
  text-align: center;
}

.eyebrow {
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.9rem;
  margin: 0 0 10px;
}

h1 {
  font-size: clamp(2.2rem, 5vw, 4rem);
  margin: 0 0 12px;
}

.subhead {
  color: var(--muted);
  font-size: 1.1rem;
  max-width: 650px;
  margin: 0 auto;
  line-height: 1.6;
}

/* Fixed 2-column layout */
.grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

@media (max-width: 720px) {
  .grid {
    grid-template-columns: 1fr;
  }
}

.card {
  background: rgba(24, 34, 45, 0.92);
  border: 1px solid var(--border);
  border-radius: 18px;
  box-shadow: var(--shadow);
  padding: 24px;
  text-decoration: none;
  color: var(--text);
  transition: transform 0.18s ease, border-color 0.18s ease;
}

.card:hover {
  transform: translateY(-4px);
  border-color: var(--accent);
}

.card h2 {
  margin: 0 0 8px;
  font-size: 1.35rem;
}

.card p {
  margin: 0 0 18px;
  color: var(--muted);
  line-height: 1.5;
}

/* 🔥 UPDATED BUTTON LAYOUT */
.card-actions {
  display: flex;
  gap: 10px;
}

.card-actions .tag {
  flex: 1;
  text-align: center;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* Mobile tightening */
@media (max-width: 500px) {
  .card-actions .tag {
    font-size: 0.75rem;
    padding: 5px 6px;
  }
}

.tag {
  display: inline-block;
  background: rgba(57, 211, 83, 0.12);
  color: var(--good);
  border: 1px solid rgba(57, 211, 83, 0.32);
  border-radius: 999px;
  padding: 6px 10px;
  font-size: 0.85rem;
  font-weight: 700;
}

.tag:hover {
  color: #5df57a;
  border-color: #5df57a;
}

.tag.alt {
  background: rgba(76, 201, 240, 0.12);
  color: var(--accent);
  border: 1px solid rgba(76, 201, 240, 0.32);
}

.tag.alt:hover {
  color: #7fdcff;
  border-color: #7fdcff;
}

.tag.checker {
  background: rgba(255, 183, 0, 0.12);
  color: #ffb700;
  border: 1px solid rgba(255, 183, 0, 0.35);
}

.tag.checker:hover {
  border-color: #ffb700;
  color: #ffd24d;
}

.coming-soon {
  opacity: 0.7;
  pointer-events: none;
}

footer {
  color: var(--muted);
  text-align: center;
  margin-top: 30px;
  font-size: 0.9rem;
}

.card-title {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.difficulty-tag {
  font-size: 0.7rem;
  font-weight: 700;
  padding: 4px 8px;
  border-radius: 999px;

  background: rgba(76, 201, 240, 0.12);
  color: var(--accent);
  border: 1px solid rgba(76, 201, 240, 0.35);
}

.solved-tag {
  font-size: 0.7rem;
  font-weight: 700;
  padding: 4px 8px;
  border-radius: 999px;

  background: rgba(255, 183, 0, 0.12);
  color: var(--solved);
  border: 1px solid rgba(255, 183, 0, 0.35);
}