* {
    margin: 0; padding: 0; box-sizing: border-box;
    font-family: 'Poppins', sans-serif; user-select: none;
}

body {
    background: radial-gradient(circle at 50% 50%, #0a0515 0%, #000000 100%);
    overflow: hidden;
    height: 100vh; width: 100vw;
    perspective: 1500px; /* Clave para el efecto 3D */
}

/* --- LOGO DE FONDO (Marca de Agua Dorada) --- */
.logo-fondo {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 80vw;
    max-width: 800px;
    opacity: 0.15; /* Qué tan visible es (0.1 a 0.3) */
    z-index: 1; /* Detrás de las estrellas, delante del fondo negro */
    pointer-events: none; /* No bloquea los clics */
    /* Convierte el logo en un tono dorado brillante */
    filter: sepia(100%) saturate(500%) hue-rotate(5deg) brightness(1.5);
    object-fit: contain;
    mix-blend-mode: screen; /* Efecto de luz */
}

/* --- 1. FONDO PROFUNDO (Estrellas y Nebulosas) --- */
#fondo-profundo {
    position: absolute; top: 0; left: 0; width: 100%; height: 100%; 
    z-index: 2; /* Encima del logo */
    background: transparent;
}

.nebulosa {
    position: absolute; border-radius: 50%; filter: blur(100px);
    opacity: 0.5; mix-blend-mode: screen;
    animation: flotar-nebulosa 15s infinite alternate ease-in-out;
}
.nebulosa-1 { width: 60vw; height: 60vh; background: #6a00ff; top: 10%; left: 10%; }
.nebulosa-2 { width: 50vw; height: 50vh; background: #ffcc00; top: 60%; left: 70%; opacity: 0.2; animation-delay: -5s; }
.nebulosa-3 { width: 40vw; height: 40vh; background: #ff00aa; top: 30%; left: 80%; opacity: 0.3; animation-delay: -10s; }

@keyframes flotar-nebulosa {
    0% { transform: translate(0, 0) scale(1); }
    100% { transform: translate(5vw, -5vh) scale(1.3); }
}

.estrella {
    position: absolute; background: white; border-radius: 50%;
    animation: titilar 3s infinite alternate;
}
@keyframes titilar { 0% { opacity: 0.1; transform: scale(0.8); } 100% { opacity: 1; transform: scale(1.2); } }

/* --- 2. PANTALLA DE INICIO --- */
#start-screen {
    position: absolute; top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(0, 0, 0, 0.7); backdrop-filter: blur(15px);
    display: flex; justify-content: center; align-items: center;
    z-index: 100; transition: opacity 1s ease, visibility 1s;
}
#start-screen.oculto { opacity: 0; visibility: hidden; }

.menu-panel {
    background: rgba(15, 5, 25, 0.85); border: 2px solid #ffcc00;
    border-radius: 20px; padding: 50px; text-align: center;
    max-width: 550px; width: 90%;
    box-shadow: 0 0 60px rgba(255, 204, 0, 0.3), inset 0 0 30px rgba(255, 204, 0, 0.1);
    animation: flotar-menu 5s infinite ease-in-out;
    position: relative; z-index: 101;
}
@keyframes flotar-menu { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-15px); } }

.menu-panel h1 {
    font-family: 'Great Vibes', cursive; font-size: 3.5rem; color: #ffcc00;
    margin-bottom: 10px; text-shadow: 0 0 25px rgba(255, 204, 0, 0.9);
}
.flores-decorativas { font-size: 2.5rem; margin-bottom: 20px; animation: brillar-flores 2s infinite alternate; }
@keyframes brillar-flores { from { filter: drop-shadow(0 0 5px #ffcc00); } to { filter: drop-shadow(0 0 25px #ffcc00); } }

.menu-panel p { color: #fff; font-size: 1.1rem; line-height: 1.6; margin-bottom: 30px; }

#btn-explorar {
    background: transparent; border: 2px solid #ffcc00; color: #ffcc00;
    padding: 18px 35px; font-size: 1.1rem; font-weight: 600;
    border-radius: 50px; cursor: pointer; transition: all 0.4s ease;
    text-transform: uppercase; letter-spacing: 2px;
}
#btn-explorar:hover { background: #ffcc00; color: black; box-shadow: 0 0 40px #ffcc00; transform: scale(1.05); }

/* --- 3. SISTEMA ORBITAL 3D --- */
#sistema-solar {
    position: absolute; top: 50%; left: 50%;
    transform: translate(-50%, -50%);
    width: 100%; height: 100%; display: flex; justify-content: center; align-items: center;
    z-index: 10; cursor: grab;
}
#sistema-solar:active { cursor: grabbing; }

#orbita {
    position: relative; width: 0; height: 0;
    transform-style: preserve-3d; transition: transform 0.1s linear;
}

/* --- PLANETAS 3D --- */
.planeta-3d {
    position: absolute; top: -90px; left: -90px;
    width: 180px; height: 180px; border-radius: 50%;
    cursor: pointer; transition: all 0.3s ease;
    transform-style: preserve-3d;
    box-shadow: 0 0 50px rgba(255, 255, 255, 0.1);
}
.planeta-3d:hover { box-shadow: 0 0 70px white; }

.superficie {
    position: absolute; top: 0; left: 0; width: 100%; height: 100%;
    border-radius: 50%;
    box-shadow: inset -25px -25px 60px rgba(0,0,0,0.9);
}
.superficie::before {
    content: ''; position: absolute; top: 15%; left: 15%;
    width: 30%; height: 30%; border-radius: 50%;
    background: radial-gradient(circle, rgba(255,255,255,0.8) 0%, transparent 70%);
    filter: blur(5px);
}

.atmosfera {
    position: absolute; top: -10px; left: -10px; right: -10px; bottom: -10px;
    border-radius: 50%; border: 2px solid rgba(255, 255, 255, 0.15);
    box-shadow: 0 0 30px rgba(255, 255, 255, 0.2), inset 0 0 30px rgba(255, 255, 255, 0.1);
    animation: pulso-atmosfera 4s infinite alternate;
}
@keyframes pulso-atmosfera { 0% { opacity: 0.5; } 100% { opacity: 1; } }

.anillo {
    position: absolute; top: 50%; left: 50%;
    width: 220%; height: 40px; border: 4px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%; transform: translate(-50%, -50%) rotateX(70deg) rotateY(-20deg);
    box-shadow: 0 0 20px rgba(255, 255, 255, 0.2); pointer-events: none;
}

/* --- 4. AMBIENTE (FLORES) --- */
.flor-flotante {
    position: absolute; font-size: 2rem;
    filter: drop-shadow(0 0 15px #ffcc00);
    animation: flotar-flor 8s infinite ease-in-out;
    z-index: 5; pointer-events: none;
}
@keyframes flotar-flor {
    0%, 100% { transform: translateY(0) rotate(0deg) scale(1); opacity: 0.7; }
    50% { transform: translateY(-40px) rotate(20deg) scale(1.2); opacity: 1; }
}

/* --- 5. MODAL --- */
.modal {
    display: none; position: fixed; top: 0; left: 0; width: 100%; height: 100%;
    background-color: rgba(0, 0, 0, 0.85); backdrop-filter: blur(10px);
    justify-content: center; align-items: center; z-index: 200; opacity: 0; transition: opacity 0.5s ease;
}
.modal.mostrar { display: flex; opacity: 1; }
.modal-contenido {
    background: rgba(20, 10, 30, 0.95); border: 2px solid #ffcc00;
    border-radius: 20px; padding: 40px; max-width: 500px; width: 90%;
    text-align: center; position: relative;
    box-shadow: 0 0 50px rgba(255, 204, 0, 0.5); transform: scale(0.8); transition: transform 0.5s ease;
}
.modal.mostrar .modal-contenido { transform: scale(1); }
.modal-contenido h2 { color: #ffcc00; margin-bottom: 15px; font-size: 2rem; text-shadow: 0 0 15px rgba(255,204,0,0.5); }
.modal-contenido p { font-size: 1.1rem; line-height: 1.6; color: #e0e0e0; }
.cerrar { position: absolute; top: 10px; right: 20px; font-size: 30px; color: white; cursor: pointer; transition: color 0.3s; }
.cerrar:hover { color: #ffcc00; }