/* ============================================================
   Robobook — Estilo base (premium dark, neon futurista)
   ============================================================ */

:root {
  --bg-0: #07080f;
  --bg-1: #0d1020;
  --bg-2: #15182b;
  --line: rgba(255, 255, 255, .08);

  --txt-0: #f1f5f9;
  --txt-1: #cbd5e1;
  --txt-2: #94a3b8;
  --txt-3: #64748b;

  --neon: #a78bfa;
  --neon-2: #7c3aed;
  --neon-3: #c4b5fd;
  --accent: #22d3ee;

  --r-sm: 8px;
  --r-md: 12px;
  --r-lg: 20px;
}

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

html, body {
  height: 100%;
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, system-ui, sans-serif;
  background: var(--bg-0);
  color: var(--txt-0);
  -webkit-font-smoothing: antialiased;
}

body {
  background:
    radial-gradient(800px 600px at 80% -10%, rgba(124, 58, 237, .18), transparent 70%),
    radial-gradient(700px 500px at -10% 110%, rgba(34, 211, 238, .10), transparent 70%),
    var(--bg-0);
  background-attachment: fixed;
  min-height: 100vh;
}

a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; }
img, svg { display: block; max-width: 100%; }

/* ----------- Reusable ----------- */
.container {
  width: 100%; max-width: 1100px; margin: 0 auto; padding: 0 24px;
}

.eyebrow {
  font-size: 11px; letter-spacing: 2.5px; text-transform: uppercase;
  color: var(--neon); font-weight: 700;
}

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  background: linear-gradient(135deg, var(--neon-2), #5b21b6);
  color: #fff; border: none; padding: 16px 28px;
  border-radius: var(--r-md); font-size: 15px; font-weight: 700;
  letter-spacing: .2px; transition: .2s; cursor: pointer;
  box-shadow: 0 8px 24px rgba(124, 58, 237, .35), inset 0 1px 0 rgba(255, 255, 255, .15);
}
.btn:hover { transform: translateY(-1px); filter: brightness(1.1); }
.btn:disabled { opacity: .55; cursor: not-allowed; transform: none; }

.btn-ghost {
  background: transparent; color: var(--txt-1);
  border: 1px solid var(--line);
  box-shadow: none;
}
.btn-ghost:hover { background: rgba(255, 255, 255, .04); }

.card {
  background: linear-gradient(180deg, var(--bg-1), var(--bg-2));
  border: 1px solid var(--line); border-radius: var(--r-lg);
  padding: 28px;
}

.loader {
  display: inline-block; width: 16px; height: 16px;
  border: 2px solid rgba(255, 255, 255, .25);
  border-top-color: #fff; border-radius: 50%;
  animation: spin .7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* Neon text accent */
.neon {
  color: var(--neon-3);
  text-shadow: 0 0 24px rgba(167, 139, 250, .4);
}

/* Fade-in util */
.fade-in { animation: fadeIn .5s ease; }
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: none; }
}