/* ==========================================================
🎨 VARIABLES DE TEMA (V4 mantenido)
========================================================== */
:root {
  --background: #F0FFFF;
  --card-bg: #FFFFFF;
  --primary: #00B4D8;
  --secondary: #FF8C00;
  --accent: #B0A990;
  --success: #2ECC71;
  --warning: #FF7F50;
  --danger: #FF5252;
  --info: #3498DB;
  --text: #333333;
}

/* ==========================================================
🧩 BASE
========================================================== */
body {
  font-family: 'Nunito', sans-serif;
  background-color: var(--background);
  background-image: linear-gradient(45deg, var(--accent) 25%, transparent 25%,
                transparent 75%, var(--accent) 75%, var(--accent)),
                linear-gradient(45deg, var(--accent) 25%, transparent 25%,
                transparent 75%, var(--accent) 75%, var(--accent));
  background-size: 60px 60px;
  background-position: 0 0, 30px 30px;
  background-blend-mode: soft-light;
  background-attachment: fixed;
  color: var(--text);
  min-height: 100vh;
  overflow-x: hidden;
}

.app-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1rem;
}

/* ==========================================================
📦 CONTENEDORES
========================================================== */
.login-container,
.signup-container,
.menu-container {
  background: linear-gradient(135deg, rgba(255,255,255,0.9), rgba(255,255,255,0.8));
  backdrop-filter: blur(5px);
  border: 2px solid var(--primary);
  border-radius: 1rem;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
  padding: 2rem;
  max-width: 500px;
  margin: 2rem auto;
  position: relative;
  overflow: hidden;
}

.menu-container,
.trivia-container,
.score-container {
  max-width: 800px;
}

/* ==========================================================
🔘 BOTONES
========================================================== */
.btn {
  transition: all 0.3s ease;
  transform: scale(1);
  position: relative;
  overflow: hidden;
  background-color: var(--primary);
  color: white;
}
.btn:hover { transform: scale(1.05); }
.btn:active { transform: scale(0.95); }

/* Ripple */
.btn::after {
  content: '';
  position: absolute;
  top: 50%; left: 50%;
  width: 5px; height: 5px;
  background: rgba(255, 255, 255, 0.5);
  opacity: 0; border-radius: 100%;
  transform: scale(1) translate(-50%, -50%);
}
.btn:focus:not(:active)::after { animation: ripple 1s ease-out; }

@keyframes ripple {
  0% { transform: scale(0) translate(-50%, -50%); opacity: 1; }
  100% { transform: scale(15) translate(-50%, -50%); opacity: 0; }
}

/* Botones especiales por ID (para que no los sobreescriba .btn) */
#login-button,
#signup-button,
#start-trivia-btn {
  background: linear-gradient(to right, var(--primary), var(--info));
  color: white;
}

#next-subject-btn,
#back-to-menu-btn {
  background: linear-gradient(to right, var(--secondary), var(--accent));
  color: white;
}

/* NUEVOS: volver al menú en varias pantallas */
#go-menu-from-trivia,
#go-menu-from-subject,
#back-from-scores {
  background: linear-gradient(to right, var(--secondary), var(--accent));
  color: white;
}

/* ==========================================================
🎮 MENÚ PRINCIPAL
========================================================== */
.menu-btn {
  height: 160px;
  font-size: 1.5rem;
  display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  margin-bottom: 1.5rem;
  border-radius: 1rem; color: white;
  text-shadow: 1px 1px 3px rgba(0,0,0,0.3);
  position: relative; overflow: hidden;
}
.menu-btn i { font-size: 3rem; margin-bottom: 1rem; }

.menu-btn.trivia-btn {
  background: linear-gradient(135deg, var(--primary), var(--info));
}
.menu-btn.scores-btn {
  background: linear-gradient(135deg, var(--secondary), var(--accent));
}

/* Logout */
.logout-btn {
  position: absolute; top: 1rem; right: 1rem;
  background-color: var(--danger); color: white;
  border-radius: 50%; width: 50px; height: 50px;
  display: flex; align-items: center; justify-content: center;
  box-shadow: 0 4px 6px rgba(0,0,0,0.1); z-index: 10;
}
.logout-btn:hover { background-color: var(--secondary); }

/* ==========================================================
🧠 PREGUNTAS
========================================================== */
.question-card {
  background-color: var(--card-bg);
  border-radius: 1rem;
  padding: 2rem; margin-bottom: 1.5rem;
  box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

.answer-btn {
  display: block; width: 100%; text-align: left;
  padding: 1rem 1.5rem; margin-bottom: 0.75rem;
  border-radius: 0.75rem;
  background: linear-gradient(to right, var(--accent), var(--secondary));
  border: 3px solid var(--secondary);
  transition: all 0.3s; color: white; font-weight: 500;
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}
.answer-btn:hover {
  background: linear-gradient(to right, var(--secondary), var(--danger));
  transform: translateY(-2px);
  box-shadow: 0 4px 8px rgba(0,0,0,0.15);
}
.answer-btn:active { transform: translateY(1px); }

.answer-btn.correct {
  background: linear-gradient(to right, var(--success), #1aaa54);
  border-color: var(--success); font-weight: bold;
}
.answer-btn.incorrect {
  background: linear-gradient(to right, var(--danger), #e03e3e);
  border-color: var(--danger); font-weight: bold;
}

/* ==========================================================
📊 PROGRESO
========================================================== */
.progress-bar { height: 10px; border-radius: 5px; background-color: var(--accent); margin: 1.5rem 0; }
.progress-bar-fill { height: 100%; border-radius: 5px; background-color: var(--primary); transition: width 0.3s ease; }

/* ==========================================================
🏆 TABLA
========================================================== */
.score-table { width: 100%; border-collapse: collapse; }
.score-table th, .score-table td { padding: 0.75rem; border-bottom: 1px solid var(--accent); text-align: center; }
.score-table tr:nth-child(even) { background-color: var(--background); }
.score-table th { background-color: var(--secondary); color: white; position: sticky; top: 0; }

/* ==========================================================
🎉 CONFETI
========================================================== */
.confetti {
  position: absolute; width: 10px; height: 10px; background-color: #f00;
  animation: confetti-fall 3s linear forwards; z-index: 1000;
}
@keyframes confetti-fall {
  0% { transform: translateY(-100px) rotate(0deg); opacity: 1; }
  100% { transform: translateY(100vh) rotate(360deg); opacity: 0; }
}

/* ==========================================================
🎞️ LOTTIE: tamaños equilibrados y centrados
========================================================== */
.lottie-container { width: 140px; height: 140px; margin: 0 auto; }
.lottie-sm { width: 140px; height: 140px; }
.lottie-md { width: 180px; height: 180px; }

/* ==========================================================
📱 RESPONSIVE
========================================================== */
@media(max-width:640px){
  .menu-container, .trivia-container, .score-container { padding: 1.5rem; }
  .menu-btn { height: 150px; font-size: 1.5rem; }
  .menu-btn i { font-size: 3rem; }
  .logout-btn { width: 60px; height: 60px; font-size: 1.5rem; }
  h1.text-3xl { font-size: 1.875rem; }
  .grid.grid-cols-1.md\:grid-cols-2 { grid-template-columns: 1fr; }
}