:root {
  --bg-deep: #05070f;
  --bg-panel: #0a0f1e;
  --bg-panel-2: #0e1526;
  --neon-blue: #4fd8ff;
  --neon-blue-dim: #1c5f75;
  --neon-blue-glow: rgba(79, 216, 255, 0.55);
  --text-main: #dff6ff;
  --text-dim: #7fa6b8;
  --danger: #ff5d7a;
  --danger-glow: rgba(255, 93, 122, 0.5);
  --success: #63ffb0;
  --success-glow: rgba(99, 255, 176, 0.5);
  --border: #1e3a4d;
}

* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
  min-height: 100%;
  background: var(--bg-deep);
  color: var(--text-main);
  font-family: "Segoe UI", "Trebuchet MS", Verdana, sans-serif;
  overflow-x: hidden;
}

/* Fond étoilé généré en CSS pur, aucune dépendance externe */
.stars {
  position: fixed;
  inset: 0;
  z-index: -1;
  background-image:
    radial-gradient(1px 1px at 10% 20%, #ffffff 100%, transparent 0),
    radial-gradient(1px 1px at 80% 10%, #ffffff 100%, transparent 0),
    radial-gradient(2px 2px at 60% 70%, #ffffff 100%, transparent 0),
    radial-gradient(1px 1px at 30% 85%, #ffffff 100%, transparent 0),
    radial-gradient(1px 1px at 90% 60%, #ffffff 100%, transparent 0),
    radial-gradient(1px 1px at 45% 40%, #ffffff 100%, transparent 0),
    radial-gradient(1px 1px at 15% 55%, #ffffff 100%, transparent 0),
    radial-gradient(2px 2px at 70% 30%, #ffffff 100%, transparent 0),
    radial-gradient(1px 1px at 95% 90%, #ffffff 100%, transparent 0),
    radial-gradient(1px 1px at 5% 75%, #ffffff 100%, transparent 0);
  background-repeat: repeat;
  background-size: 400px 400px;
  opacity: 0.5;
}

header {
  text-align: center;
  padding: 2.2rem 1rem 1rem;
}

header h1 {
  margin: 0;
  font-size: 2.4rem;
  letter-spacing: 0.4rem;
  color: var(--text-main);
  text-shadow: 0 0 8px var(--neon-blue-glow), 0 0 22px var(--neon-blue-glow);
}

header h1 span {
  color: var(--neon-blue);
}

.subtitle {
  color: var(--text-dim);
  margin-top: 0.4rem;
  letter-spacing: 0.06rem;
  font-size: 0.95rem;
}

main {
  max-width: 640px;
  margin: 0 auto;
  padding: 1rem 1.2rem 3rem;
}

/* Sélecteur de carte */
.card-selector {
  max-width: 640px;
  margin: 0 auto;
  padding: 0.5rem 1.2rem;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 1rem;
}

.card-btn {
  background: linear-gradient(160deg, var(--bg-panel), var(--bg-panel-2));
  border: 1px solid var(--border);
  border-radius: 10px;
  color: var(--text-main);
  padding: 1.1rem 0.8rem;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: box-shadow 0.2s ease, border-color 0.2s ease, transform 0.15s ease;
  text-align: center;
}

.card-btn small {
  display: block;
  margin-top: 0.4rem;
  font-weight: 400;
  color: var(--text-dim);
  font-size: 0.78rem;
}

.card-btn:hover, .card-btn:focus-visible {
  border-color: var(--neon-blue);
  box-shadow: 0 0 12px var(--neon-blue-glow);
  transform: translateY(-2px);
  outline: none;
}

/* Panneau digicode */
.digicode-panel {
  background: linear-gradient(180deg, var(--bg-panel), var(--bg-panel-2));
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 1.6rem;
  margin-top: 0.5rem;
  box-shadow: 0 0 30px rgba(79, 216, 255, 0.08), inset 0 0 40px rgba(0,0,0,0.4);
  position: relative;
}

.digicode-panel.hidden,
.card-selector.hidden {
  display: none;
}

.back-btn {
  background: rgba(255, 93, 122, 0.1);
  border: 1px solid var(--danger);
  color: var(--danger);
  border-radius: 6px;
  padding: 0.4rem 0.8rem;
  cursor: pointer;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 0.8rem;
  box-shadow: 0 0 8px var(--danger-glow);
  transition: background 0.15s ease, box-shadow 0.15s ease;
}

.back-btn:hover {
  background: rgba(255, 93, 122, 0.2);
  box-shadow: 0 0 14px var(--danger-glow);
}

#panel-title {
  margin: 0 0 1.2rem;
  text-align: center;
  letter-spacing: 0.08rem;
  color: var(--neon-blue);
  text-shadow: 0 0 10px var(--neon-blue-glow);
  font-size: 1.2rem;
}

.code-display {
  display: flex;
  justify-content: center;
  gap: 0.6rem;
  margin-bottom: 1.4rem;
  flex-wrap: wrap;
}

.code-display .slot {
  width: 2.6rem;
  height: 3.2rem;
  border: 1px solid var(--neon-blue-dim);
  border-radius: 6px;
  background: rgba(0, 0, 0, 0.35);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  font-family: "Consolas", monospace;
  color: var(--neon-blue);
  text-shadow: 0 0 8px var(--neon-blue-glow);
}

.code-display .slot.filled {
  border-color: var(--neon-blue);
  box-shadow: 0 0 10px var(--neon-blue-glow);
}

.code-display .comma {
  display: flex;
  align-items: flex-end;
  justify-content: center;
  width: 0.8rem;
  height: 3.2rem;
  padding-bottom: 0.35rem;
  font-size: 1.8rem;
  font-family: "Consolas", monospace;
  color: var(--neon-blue);
  text-shadow: 0 0 8px var(--neon-blue-glow);
}

.keypad {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.6rem;
  margin-bottom: 1.2rem;
}

.keypad.choice-grid {
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
}

.choice-btn {
  padding: 0.9rem 0.6rem;
  text-align: center;
}

.key-btn {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border);
  color: var(--text-main);
  border-radius: 8px;
  padding: 0.8rem 0;
  font-size: 1.1rem;
  cursor: pointer;
  transition: box-shadow 0.15s ease, border-color 0.15s ease, background 0.15s ease;
}

.key-btn:hover, .key-btn:focus-visible {
  border-color: var(--neon-blue);
  box-shadow: 0 0 10px var(--neon-blue-glow);
  background: rgba(79, 216, 255, 0.08);
  outline: none;
}

.key-btn:disabled {
  opacity: 0.3;
  cursor: not-allowed;
}

.key-btn.backspace {
  grid-column: span 2;
  color: var(--text-dim);
}

.action-row {
  display: flex;
  gap: 0.8rem;
}

.action-btn {
  flex: 1;
  padding: 0.75rem 0;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  letter-spacing: 0.03rem;
  transition: box-shadow 0.15s ease, transform 0.1s ease, opacity 0.15s ease;
}

.clear-btn {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border);
  color: var(--text-dim);
}

.clear-btn:hover {
  border-color: var(--danger);
  color: var(--danger);
  box-shadow: 0 0 10px var(--danger-glow);
}

.validate-btn {
  background: rgba(79, 216, 255, 0.1);
  border: 1px solid var(--neon-blue);
  color: var(--neon-blue);
}

.validate-btn:hover:not(:disabled) {
  box-shadow: 0 0 16px var(--neon-blue-glow);
  transform: translateY(-1px);
}

.validate-btn:disabled {
  opacity: 0.35;
  cursor: not-allowed;
  border-color: var(--border);
  color: var(--text-dim);
}

.message-box {
  margin-top: 1.4rem;
  padding: 1rem 1.1rem;
  border-radius: 8px;
  font-size: 0.98rem;
  line-height: 1.5;
  border: 1px solid var(--border);
  background: rgba(0, 0, 0, 0.3);
}

.message-box.hidden {
  display: none;
}

.message-box.success {
  border-color: var(--success);
  color: var(--success);
  box-shadow: 0 0 14px var(--success-glow);
}

.message-box.fail {
  border-color: var(--danger);
  color: var(--danger);
  box-shadow: 0 0 14px var(--danger-glow);
}

.message-box.neutral {
  border-color: var(--text-dim);
  color: var(--text-main);
}

.message-box p {
  margin: 0 0 0.6rem;
}

.message-box p:last-child {
  margin-bottom: 0;
}

.message-box a {
  color: inherit;
  text-decoration: underline;
  text-underline-offset: 2px;
}

.message-box a:hover,
.message-box a:focus-visible {
  text-shadow: 0 0 8px currentColor;
}

@media (max-width: 420px) {
  header h1 {
    font-size: 1.8rem;
    letter-spacing: 0.25rem;
  }
  .code-display .slot {
    width: 2.2rem;
    height: 2.8rem;
    font-size: 1.25rem;
  }
}

footer {
  max-width: 640px;
  margin: 2rem auto 0;
  padding: 1.2rem 1.2rem 2rem;
  border-top: 1px solid var(--border);
  text-align: center;
}

.footer-links p {
  color: var(--text-dim);
  font-size: 0.82rem;
  margin: 0 0 0.7rem;
  line-height: 1.4;
}

.footer-links a {
  color: var(--neon-blue);
  text-decoration: none;
  font-size: 0.82rem;
  margin: 0 0.6rem;
  transition: text-shadow 0.15s ease;
}

.footer-links a:hover,
.footer-links a:focus-visible {
  text-shadow: 0 0 8px var(--neon-blue-glow);
  text-decoration: underline;
}