/* ===== PALETA TCDS (tema oscuro coherencial) =====
   Fondo: negro profundo ligeramente azulado
   Tipografía: claro alto contraste
   Acentos: cian y magenta (Q–Σ) + verde para OK
*/

:root {
  --bg: #040612;
  --bg-alt: #090f1f;
  --bg-soft: #12172a;
  --fg: #f5f7ff;
  --muted: #a5acc7;
  --accent: #36e1ff;   /* Σ/Q */
  --accent2: #ff6bff;  /* φ */
  --accent-ok: #4ade80;
  --border-soft: rgba(255, 255, 255, 0.06);
  --shadow-soft: 0 18px 45px rgba(0, 0, 0, 0.65);
  --radius: 18px;
  --transition-fast: 0.15s ease-out;
  --font-main: system-ui, -apple-system, BlinkMacSystemFont, "SF Pro Text",
               "Segoe UI", Roboto, sans-serif;
}

/* ===== RESETEO SUAVE ===== */

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

html,
body {
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-main);
  background: radial-gradient(circle at top, #161b33 0, #050713 45%, #02030a 100%);
  color: var(--fg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* ===== LAYOUT BÁSICO ===== */

header {
  padding: 2.5rem 1.5rem 1.5rem;
  text-align: center;
  background: linear-gradient(145deg, rgba(8, 12, 32, 0.95), rgba(4, 6, 18, 0.98));
  border-bottom: 1px solid var(--border-soft);
  box-shadow: var(--shadow-soft);
}

header h1 {
  margin: 0 0 0.4rem;
  font-size: 2rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

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

nav {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(14px);
  background: linear-gradient(90deg, rgba(5, 7, 19, 0.92), rgba(5, 7, 19, 0.86));
  border-bottom: 1px solid var(--border-soft);
}

nav ul {
  margin: 0;
  padding: 0.4rem 1rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  list-style: none;
  justify-content: center;
}

nav a {
  display: inline-block;
  padding: 0.35rem 0.85rem;
  border-radius: 999px;
  font-size: 0.8rem;
  text-decoration: none;
  color: var(--muted);
  border: 1px solid transparent;
  transition: color var(--transition-fast),
              background var(--transition-fast),
              border-color var(--transition-fast),
              transform var(--transition-fast);
}

nav a:hover {
  color: var(--fg);
  background: radial-gradient(circle at top, rgba(54, 225, 255, 0.18), transparent 60%);
  border-color: rgba(54, 225, 255, 0.6);
  transform: translateY(-1px);
}
/* ==== TABLAS (catálogo de productos) ==== */

.table-wrapper {
  margin-top: 1rem;
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.85rem;
  border: 1px solid var(--border-soft);
  background: rgba(5, 8, 20, 0.95);
}

thead {
  background: linear-gradient(90deg, rgba(54, 225, 255, 0.15), rgba(255, 107, 255, 0.12));
}

th,
td {
  padding: 0.5rem 0.6rem;
  text-align: left;
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
}

th {
  font-weight: 600;
  color: var(--accent);
}

tbody tr:hover {
  background: rgba(255, 255, 255, 0.03);
}
/* ===== CONTENIDO ===== */

main {
  max-width: 960px;
  margin: 1.5rem auto 2.5rem;
  padding: 0 1rem;
}

section {
  background: linear-gradient(145deg, rgba(9, 14, 32, 0.98), rgba(7, 11, 26, 0.98));
  border-radius: var(--radius);
  padding: 1.5rem 1.4rem;
  margin-bottom: 1.1rem;
  border: 1px solid var(--border-soft);
  box-shadow: 0 18px 36px rgba(0, 0, 0, 0.55);
}

section h2 {
  margin-top: 0;
  margin-bottom: 0.8rem;
  font-size: 1.2rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--accent);
}

section p {
  font-size: 0.92rem;
  color: var(--fg);
}

section ul {
  margin: 0.4rem 0 0.4rem 1.2rem;
  padding: 0;
}

section li {
  font-size: 0.9rem;
  color: var(--muted);
  margin-bottom: 0.2rem;
}

/* Bloques de cita y código */

blockquote {
  margin: 0.6rem 0;
  padding: 0.8rem 1rem;
  background: rgba(10, 18, 40, 0.9);
  border-left: 3px solid var(--accent2);
  border-radius: 0 var(--radius) var(--radius) 0;
  font-size: 0.9rem;
  color: var(--fg);
}

pre {
  margin: 0.7rem 0;
  padding: 0.8rem 1rem;
  background: #050818;
  border-radius: var(--radius);
  border: 1px solid var(--border-soft);
  font-size: 0.8rem;
  overflow-x: auto;
}

/* Enlaces */

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

a:hover {
  text-decoration: underline;
}

/* Footer */

footer {
  text-align: center;
  padding: 1.2rem 1rem 1.8rem;
  color: var(--muted);
  font-size: 0.8rem;
  border-top: 1px solid var(--border-soft);
  background: linear-gradient(180deg, rgba(4, 6, 16, 0.96), rgba(2, 3, 10, 1));
}

/* ===== RESPONSIVE ===== */

@media (min-width: 768px) {
  header h1 {
    font-size: 2.4rem;
  }
  header p {
    font-size: 1rem;
  }
  section {
    padding: 1.8rem 1.6rem;
  }
}

@media (max-width: 480px) {
  nav ul {
    justify-content: flex-start;
    overflow-x: auto;
  }
  nav a {
    white-space: nowrap;
  }
}