/* Portada del canal: oscuro, tipografia grande, cuadricula de tarjetas.
   Pensada para que una presentacion nueva aparezca en /slides/<nombre>/ y
   solo haga falta anadir una <a class="card"> en index.html. */

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

:root {
  --bg: #0d1117;
  --panel: #161b22;
  --panel2: #1f2937;
  --accent: #f5a623;
  --accent2: #ffd27a;
  --text: #e6edf3;
  --muted: #8b949e;
  --border: #30363d;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.5;
}

header {
  background: linear-gradient(135deg, #1a1f29 0%, #0d1117 100%);
  border-bottom: 1px solid var(--border);
  padding: 2.5rem 2rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  max-width: 1200px;
  margin: 0 auto;
}

.logo {
  font-size: 3.5rem;
  line-height: 1;
}

header h1 {
  color: var(--accent);
  font-size: 2.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

header p {
  color: var(--muted);
  font-size: 1.1rem;
}

main {
  max-width: 1200px;
  margin: 3rem auto;
  padding: 0 2rem;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.5rem;
}

.card {
  display: block;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.75rem;
  text-decoration: none;
  color: var(--text);
  transition: transform 0.15s, border-color 0.15s, background 0.15s;
  position: relative;
}

.card:hover {
  transform: translateY(-3px);
  border-color: var(--accent);
  background: var(--panel2);
}

.card .num {
  position: absolute;
  top: 1rem;
  right: 1.25rem;
  font-family: ui-monospace, SFMono-Regular, monospace;
  color: var(--muted);
  font-size: 0.9rem;
}

.card h2 {
  color: var(--accent2);
  font-size: 1.3rem;
  margin-bottom: 0.5rem;
}

.card p {
  color: var(--muted);
  font-size: 0.95rem;
  margin-bottom: 1rem;
}

.card .tag {
  display: inline-block;
  background: rgba(245, 166, 35, 0.1);
  color: var(--accent);
  padding: 0.25rem 0.6rem;
  border-radius: 999px;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border: 1px solid rgba(245, 166, 35, 0.3);
}

footer {
  text-align: center;
  padding: 2rem;
  color: var(--muted);
  border-top: 1px solid var(--border);
  margin-top: 4rem;
}

footer a {
  color: var(--accent);
  text-decoration: none;
}

footer a:hover {
  text-decoration: underline;
}