:root {
  --bg: #0A092C;
  --pink: #FF6B6B;
  --blue: #335C81;
  --indigo: #1B2845;
  --sky: #5899E2;
  --card: #ffffff;
  --text: #1B2845;
  --muted: #6b7280;
  --green: #4CAF50;
  --red: #ef4444;
  --orange: #f97316;
  --gold: #FFD700;
  --border: #e9ecef;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

body {
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  padding-top: 100px;
}

/* Header fijo con decoración navideña */
.fixed-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: var(--indigo);
  padding: 12px 16px 16px;
  z-index: 1000;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.christmas-lights {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  pointer-events: none;
}

.christmas-lights img {
  width: 100%;
  max-width: 600px;
  height: 100%;
  object-fit: contain;
  opacity: 0.9;
}

.header-content {
  position: relative;
  padding-top: 35px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
}

.header-title {
  font-size: 1.2rem;
  font-weight: 700;
  color: white;
}

.home-btn {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: #ffffff;
  text-decoration: none;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.3);
  padding: 6px 14px;
  background: rgba(255, 255, 255, 0.1);
  transition: all 0.15s ease;
  white-space: nowrap;
}

.home-btn:hover {
  background: rgba(255, 255, 255, 0.2);
  border-color: rgba(255, 255, 255, 0.5);
}

/* Container principal */
.container {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: calc(100vh - 100px);
  padding: 16px;
}

/* App card */
.app {
  width: 100%;
  max-width: 480px;
  background: var(--card);
  border-radius: 18px;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.08), 0 0 0 1px rgba(0, 0, 0, 0.03);
  padding: 14px 14px 12px;
  border: 1px solid rgba(27, 40, 69, 0.1);
}

/* Pantallas */
.screen {
  display: none;
}

.screen.active {
  display: block;
  animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Content area */
.content {
  background: #f8f9fa;
  border-radius: 16px;
  padding: 20px 16px;
  border: 1px solid rgba(148, 163, 184, 0.3);
}

.intro-text {
  font-size: 0.9rem;
  line-height: 1.6;
  color: var(--text);
  margin-bottom: 20px;
  text-align: center;
}

/* Botones comunes */
.btn {
  width: 100%;
  padding: 14px 20px;
  border-radius: 12px;
  border: none;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s ease;
  touch-action: manipulation;
}

.btn-primary {
  background: var(--sky);
  color: #ffffff;
  border: 2px solid var(--sky);
}

.btn-primary:hover {
  background: #4a8dd4;
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(88, 153, 226, 0.3);
}

.btn-secondary {
  background: #ffffff;
  color: var(--indigo);
  border: 2px solid rgba(51, 92, 129, 0.3);
}

.btn-secondary:hover {
  background: #f9f9f9;
  border-color: var(--blue);
}

.btn:active {
  transform: scale(0.98);
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn-group {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

/* Form groups */
.form-group {
  margin-bottom: 16px;
}

.form-group label {
  display: block;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--indigo);
  margin-bottom: 8px;
}

.form-group input,
.form-group select {
  width: 100%;
  padding: 12px 14px;
  border: 2px solid rgba(148, 163, 184, 0.3);
  border-radius: 10px;
  font-size: 1rem;
  background: #ffffff;
}

.form-group input:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--sky);
}

/* Footer */
footer {
  margin-top: 12px;
  font-size: 0.75rem;
  color: var(--muted);
  text-align: center;
}

/* Responsive */
@media (max-width: 600px) {
  body {
    padding-top: 90px;
  }

  .fixed-header {
    padding: 10px 14px 14px;
  }

  .christmas-lights {
    height: 35px;
  }

  .header-content {
    padding-top: 30px;
  }

  .header-title {
    font-size: 1.1rem;
  }

  .container {
    padding: 12px;
    min-height: calc(100vh - 90px);
  }

  .app {
    padding: 12px 10px 10px;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 10px;
  }
}