/* =========================================
   VARIABLES Y RESET
   ========================================= */
   :root {
    --bg-dark: #0a0a0a;
    --vault-metal: #2c313c;
    --vault-border: #1a1d24;
    --neon-red: #ff003c;
    --neon-green: #00ff66;
    --digital-bg: #110000;
    --digital-bg-green: #001100;
    --text-light: #e0e6ed;
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-dark);
    color: var(--text-light);
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: hidden;
}

/* =========================================
   FONDO INMERSIVO
   ========================================= */
.cyber-background {
    position: absolute; top: 0; left: 0; width: 100%; height: 100%;
    background: radial-gradient(circle at center, #1a1a1a 0%, #000000 100%);
    z-index: -1;
}
.cyber-background::before {
    content: ''; position: absolute; width: 100%; height: 100%;
    background-image: 
        linear-gradient(rgba(255, 0, 60, 0.05) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 0, 60, 0.05) 1px, transparent 1px);
    background-size: 30px 30px;
}

.main-container { width: 100%; display: flex; justify-content: center; align-items: center; }

/* =========================================
   PANEL DE CONFIGURACIÓN DEL PROFESOR
   ========================================= */
.setup-panel { display: none; width: 100%; max-width: 500px; }
.setup-panel.active { display: block; animation: fadeIn 0.5s ease; }

.setup-card {
    background: #111;
    border: 2px solid #333;
    border-radius: 12px;
    padding: 30px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.8);
}
.setup-header { display: flex; align-items: center; gap: 15px; margin-bottom: 15px; color: var(--text-light); border-bottom: 1px solid #333; padding-bottom: 15px;}
.setup-header i { font-size: 2rem; color: #4caf50; }
.setup-header h2 { font-weight: 900; letter-spacing: 1px; }

.setup-instructions { color: #888; font-size: 0.9rem; margin-bottom: 25px; }

.form-group { margin-bottom: 20px; }
.form-group label { display: block; font-size: 0.85rem; color: #aaa; margin-bottom: 8px; text-transform: uppercase; letter-spacing: 1px; }
.form-group input {
    width: 100%; padding: 12px 15px;
    background: #000; border: 1px solid #444; border-radius: 6px;
    color: var(--neon-green); font-family: 'Share Tech Mono', monospace; font-size: 1.5rem;
    outline: none; transition: border-color 0.3s;
}
.form-group input:focus { border-color: var(--neon-green); box-shadow: 0 0 10px rgba(0, 255, 102, 0.2); }

.btn-start {
    width: 100%; padding: 15px; margin-top: 10px;
    background: #4caf50; color: #000;
    border: none; border-radius: 6px;
    font-size: 1.1rem; font-weight: 900; letter-spacing: 1px;
    cursor: pointer; display: flex; align-items: center; justify-content: center; gap: 10px;
    transition: all 0.2s;
}
.btn-start:hover { background: #45a049; transform: scale(1.02); box-shadow: 0 0 15px rgba(76, 175, 80, 0.5); }

/* =========================================
   LA BÓVEDA (INTERFAZ DE JUEGO)
   ========================================= */
.vault-interface { display: none; width: 100%; max-width: 600px; perspective: 1000px; }
.vault-interface.active { display: block; animation: dropIn 0.8s cubic-bezier(0.175, 0.885, 0.32, 1.275); }

.vault-door {
    background: var(--vault-metal);
    border: 15px solid var(--vault-border);
    border-radius: 20px;
    padding: 40px;
    box-shadow: 
        inset 0 0 50px rgba(0,0,0,0.8),
        0 20px 50px rgba(0,0,0,0.9);
    position: relative;
    display: flex; flex-direction: column; gap: 25px;
}

/* Letrero de Advertencia */
.warning-sign {
    background: repeating-linear-gradient(45deg, #000, #000 10px, #ffb300 10px, #ffb300 20px);
    color: #fff; text-shadow: 1px 1px 2px #000;
    text-align: center; padding: 10px; font-weight: 900; letter-spacing: 2px;
    border: 2px solid #000; border-radius: 4px; box-shadow: inset 0 0 10px rgba(0,0,0,0.5);
}

/* Reloj Digital */
.timer-container { text-align: center; background: #050505; border: 4px solid #111; border-radius: 10px; padding: 15px; box-shadow: inset 0 0 20px rgba(0,0,0,0.8); }
.digital-text { font-family: 'Share Tech Mono', monospace; }
.timer-normal { font-size: 5rem; color: var(--neon-red); text-shadow: 0 0 15px var(--neon-red); letter-spacing: 5px; line-height: 1; }

/* Efectos de Reloj */
.timer-urgent { animation: pulseRed 1s infinite; }
@keyframes pulseRed { 0% { opacity: 1; } 50% { opacity: 0.3; } 100% { opacity: 1; } }

/* Pantalla del Teclado */
.screen-container { background: var(--digital-bg); border: 4px solid #111; border-radius: 8px; padding: 20px; text-align: center; box-shadow: inset 0 0 20px rgba(0,0,0,0.9); transition: background 0.3s; }
.screen-header { font-size: 0.8rem; color: #666; letter-spacing: 2px; margin-bottom: 10px; }
.input-display { font-size: 3.5rem; color: var(--neon-red); text-shadow: 0 0 10px var(--neon-red); letter-spacing: 15px; height: 70px; display: flex; align-items: center; justify-content: center; overflow: hidden; }
.system-message { font-family: 'Share Tech Mono', monospace; font-size: 1rem; color: var(--neon-red); margin-top: 10px; height: 20px; }

/* Teclado Numérico */
.keypad-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 15px; margin-top: 10px; }
.key-btn {
    background: linear-gradient(to bottom, #4a5263, #2a2e38);
    border: 2px solid #111; border-radius: 8px;
    color: #fff; font-family: 'Inter', sans-serif; font-size: 2rem; font-weight: 900;
    padding: 20px 0; cursor: pointer;
    box-shadow: 0 6px 0 #15181e, 0 10px 10px rgba(0,0,0,0.5);
    transition: all 0.1s; text-shadow: 1px 1px 2px #000;
}
.key-btn:active { transform: translateY(6px); box-shadow: 0 0 0 #15181e, 0 2px 5px rgba(0,0,0,0.5); background: #3a404d; }

.btn-danger { color: #ff5252; font-size: 1.5rem; }
.btn-success { color: #69f0ae; font-size: 1.5rem; }

/* =========================================
   ESTADOS DE JUEGO (Éxito / Fracaso)
   ========================================= */

/* Éxito (Verde) */
.vault-interface.success .timer-normal, .vault-interface.success .input-display, .vault-interface.success .system-message { color: var(--neon-green); text-shadow: 0 0 15px var(--neon-green); }
.vault-interface.success .screen-container { background: var(--digital-bg-green); }
.vault-interface.success .vault-door { border-color: #003311; box-shadow: 0 0 50px rgba(0, 255, 102, 0.2); }

/* Fracaso / Error (Animación Shake) */
.error-shake { animation: shake 0.4s cubic-bezier(.36,.07,.19,.97) both; }
@keyframes shake { 10%, 90% { transform: translate3d(-2px, 0, 0); } 20%, 80% { transform: translate3d(4px, 0, 0); } 30%, 50%, 70% { transform: translate3d(-6px, 0, 0); } 40%, 60% { transform: translate3d(6px, 0, 0); } }

/* Adornos */
.vault-rivets { display: flex; justify-content: space-around; margin-top: 10px; }
.rivet { width: 12px; height: 12px; background: #111; border-radius: 50%; box-shadow: inset 1px 1px 2px #444, inset -1px -1px 2px #000; }

.hidden-reset { position: fixed; bottom: 20px; right: 20px; background: none; border: none; color: #333; cursor: pointer; font-size: 1.5rem; transition: color 0.2s; z-index: 100; }
.hidden-reset:hover { color: #888; }

/* Animaciones de Entrada */
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
@keyframes dropIn { 0% { opacity: 0; transform: translateY(-100px) rotateX(10deg); } 100% { opacity: 1; transform: translateY(0) rotateX(0); } }

@media (max-width: 600px) { .vault-interface { padding: 15px; } .vault-door { padding: 20px; } .key-btn { padding: 15px 0; font-size: 1.5rem; } .timer-normal { font-size: 4rem; } }