:root {
  color-scheme: light dark;

  --bg: #fafafa;
  --fg: #1a1a1a;
  --muted: #6b6b6b;
  --card-bg: #ffffff;
  --card-border: #e5e5e5;
  --accent: #3a5ba0;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.06);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #121212;
    --fg: #ededed;
    --muted: #9a9a9a;
    --card-bg: #1c1c1c;
    --card-border: #2c2c2c;
    --accent: #8fb0e8;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.4);
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji";
  line-height: 1.5;
}

main {
  flex: 1;
  width: 100%;
  max-width: 780px;
  margin: 0 auto;
  padding: 3rem 1.25rem 2rem;
}

header {
  text-align: center;
  margin-bottom: 2.5rem;
}

h1 {
  font-size: 1.75rem;
  font-weight: 600;
  margin: 0 0 0.35rem;
  letter-spacing: -0.01em;
}

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

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
}

.card {
  display: block;
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 14px;
  padding: 1.25rem;
  text-decoration: none;
  color: inherit;
  box-shadow: var(--shadow);
  transition: transform 0.12s ease, border-color 0.12s ease;
}

a.card:hover,
a.card:focus-visible {
  transform: translateY(-2px);
  border-color: var(--accent);
}

.card--static {
  opacity: 0.85;
}

.emoji {
  font-size: 1.75rem;
  line-height: 1;
  margin-bottom: 0.6rem;
}

.card h2 {
  font-size: 1.05rem;
  font-weight: 600;
  margin: 0 0 0.3rem;
}

.card .description {
  margin: 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.access {
  display: inline-block;
  margin-top: 0.7rem;
  font-size: 0.75rem;
  color: var(--muted);
  border: 1px solid var(--card-border);
  border-radius: 999px;
  padding: 0.2rem 0.6rem;
}

.badges {
  display: flex;
  gap: 0.4rem;
  margin-top: 0.7rem;
}

.badge {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--accent);
  text-decoration: none;
  border: 1px solid var(--accent);
  border-radius: 999px;
  padding: 0.15rem 0.55rem;
}

.badge:hover,
.badge:focus-visible {
  background: var(--accent);
  color: var(--card-bg);
}

.error {
  text-align: center;
  color: var(--muted);
  margin-top: 2rem;
}

.session-line {
  text-align: center;
  color: var(--muted);
  font-size: 0.8rem;
  margin: 0;
  padding-top: 0.5rem;
}

.session-line a {
  color: var(--accent);
  text-decoration: none;
}

.session-line a:hover,
.session-line a:focus-visible {
  text-decoration: underline;
}

footer {
  text-align: center;
  padding: 1.5rem 1rem 2rem;
  color: var(--muted);
  font-size: 0.8rem;
}

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

  h1 {
    font-size: 1.5rem;
  }
}