:root {
    /* Colores para el fondo dinámico */
    --color-bg-1: #ff4e50;
    --color-bg-2: #1fddff;
    --color-bg-3: #f9d423;
    
    /* Glassmorphism vars */
    --glass-bg-main: rgba(40, 40, 40, 0.4); /* Más transparente para ver el fondo */
    --glass-bg-tight: rgba(30, 30, 30, 0.5);
    --glass-border: rgba(255, 255, 255, 0.2);
    --glass-blur: 45px; /* Desenfocar más el fondo */
    
    --text-color: #ffffff;
    --text-muted: #e0e0e0;
    
    /* Colores de estado */
    --accent-green: #00e676; /* Verde más vibrante */
    --accent-red: #ff1744;   /* Rojo más vibrante */
    --accent-gradient: linear-gradient(135deg, var(--color-bg-1), var(--color-bg-2));
    
    --input-bg: rgba(0, 0, 0, 0.4);
}

body, html {
    margin: 0; padding: 0;
    font-family: 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
    min-height: 100vh;
    color: var(--text-color);
    overflow-x: hidden;
    /* Eliminamos el background-color sólido para ver los gradientes */
}

/* --- Fondo Estático con Ruido y Gradientes INTENSOS --- */
.bg-gradient {
    position: fixed; top: 0; left: 0; width: 100%; height: 100%; z-index: -2;
    /* Gradientes más fuertes y grandes para que se note el color */
    background: 
        radial-gradient(circle at 20% 40%, rgba(255, 78, 80, 0.5) 0%, transparent 50%),
        radial-gradient(circle at 80% 60%, rgba(31, 221, 255, 0.5) 0%, transparent 50%),
        radial-gradient(circle at 50% 10%, rgba(249, 212, 35, 0.3) 0%, transparent 60%),
        linear-gradient(to bottom right, #0f0f0f, #1a1a1a); /* Base oscura para unirlo */
    background-blend-mode: screen;
}

.bg-noise {
    position: fixed; top: 0; left: 0; width: 100%; height: 100%; z-index: -1;
    opacity: 0.015; /* Aumentada la opacidad del ruido */
    pointer-events: none;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.7' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)'/%3E%3C/svg%3E");
}

/* --- Estilos Glassmorphism Genéricos --- */
.glass-effect-main {
    background: var(--glass-bg-main);
    backdrop-filter: blur(var(--glass-blur));
    -webkit-backdrop-filter: blur(var(--glass-blur));
    border: 1px solid var(--glass-border);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
}

.glass-effect-tight {
    background: var(--glass-bg-tight);
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
    border: 1px solid var(--glass-border);
}

.glass-effect-nav {
    background: rgba(0, 0, 0, 0.6); /* Un poco más oscuro arriba */
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--glass-border);
}


/* --- Navegación Superior --- */
.top-nav {
    display: flex; justify-content: center; flex-wrap: wrap; gap: 15px;
    padding: 15px 20px; margin-bottom: 20px;
}

.nav-link {
    text-decoration: none; color: var(--text-muted); font-size: 0.9rem;
    font-weight: 600; text-transform: uppercase; letter-spacing: 1px;
    padding: 8px 12px; border-radius: 8px; transition: 0.3s;
}

.nav-link:hover { background: rgba(255,255,255,0.1); color: #fff; }
.nav-link.active {
    background: var(--accent-gradient);
    color: #000; text-shadow: none;
    box-shadow: 0 4px 15px rgba(31, 221, 255, 0.4);
}

.container {
    max-width: 900px; margin: 0 auto; padding: 0 20px 40px 20px;
    display: flex; flex-direction: column; align-items: center;
}

/* --- Panel de Control --- */
.control-panel {
    display: flex; gap: 15px; align-items: center; margin-bottom: 25px; flex-wrap: wrap; justify-content: center;
    padding: 15px 25px; border-radius: 12px;
}

.custom-file-upload {
    font-size: 0.9rem; color: var(--text-color); cursor: pointer;
    padding: 10px 15px; border-radius: 8px; background: rgba(255,255,255,0.1); transition: 0.3s;
    display: flex; align-items: center; gap: 8px;
}
.custom-file-upload:hover { background: rgba(255,255,255,0.2); }

.github-selector-container { display: flex; align-items: center; gap: 10px; }
select#github-file-select {
    background: rgba(0,0,0,0.3); color: white; border: 1px solid var(--glass-border);
    padding: 10px; border-radius: 8px; outline: none; min-width: 220px; font-size: 0.9rem;
}
select#github-file-select option { background: #222; }

/* Allow selector to shrink inside flex containers on small screens */
.github-selector-container { min-width: 0; flex: 1 1 auto; }
select#github-file-select { width: 100%; max-width: 100%; box-sizing: border-box; }
.custom-file-upload { flex: 0 0 auto; }

/* --- Tarjeta Principal --- */
.card {
    border-radius: 20px; padding: 40px; width: 100%; max-width: 600px;
}

.card-header {
    margin-bottom: 30px; text-align: center;
    border-bottom: 1px solid var(--glass-border); padding-bottom: 20px;
}

.prompt-container {
    display: flex; align-items: center; justify-content: center; gap: 15px;
}

#prompt-text {
    margin: 0; color: #fff; font-weight: 700; font-size: 2rem; letter-spacing: 1px;
    text-shadow: 0 2px 10px rgba(0,0,0,0.5);
}

/* --- Inputs --- */
.inputs-container { display: flex; flex-direction: column; gap: 20px; margin-bottom: 35px; }
.input-group.hidden { display: none; }
.label-row { display: flex; justify-content: space-between; align-items: center; margin-bottom: 8px; }
.label-row label, .input-group > label {
    font-size: 0.8rem; color: var(--text-muted); text-transform: uppercase; letter-spacing: 1.2px; font-weight: 600;
}

.input-group input {
    background-color: var(--input-bg); border: 2px solid rgba(255, 255, 255, 0.1);
    padding: 16px; width: 100%; box-sizing: border-box;
    border-radius: 10px; color: white; font-size: 1.2rem; transition: 0.3s;
    backdrop-filter: blur(5px);
}
.input-group input:focus {
    outline: none; border-color: var(--color-bg-2); background-color: rgba(0,0,0,0.6);
    box-shadow: 0 0 15px rgba(31, 221, 255, 0.3);
}

/* Botones Audio */
.icon-btn {
    background: none; border: none; font-size: 1.3rem; cursor: pointer; color: var(--text-muted);
    transition: 0.3s; padding: 4px; border-radius: 50%;
}
.icon-btn:hover { color: white; background: rgba(255,255,255,0.1); transform: scale(1.1); }

.hidden { display: none !important; }

/* ------------------ Responsive: Tablet & Mobile ------------------ */
@media (max-width: 1024px) {
    .container { max-width: 720px; padding: 0 16px 30px; }
    .card { padding: 30px; max-width: 100%; }
    #prompt-text { font-size: 1.6rem; }
    .nav-box { width: 34px; height: 34px; font-size: 0.85rem; }
    select#github-file-select { min-width: 180px; }
    .top-nav { gap: 10px; padding: 12px; }
    .control-panel { padding: 12px 16px; gap: 10px; }
    .glass-btn-accent { padding: 14px; font-size: 1.1rem; }
    .inputs-container { gap: 16px; }
    .input-group input { padding: 14px; font-size: 1.1rem; }
    .modal h2 { font-size: 2rem; }
}

@media (max-width: 600px) {
    .container { max-width: 100%; padding: 0 12px 24px; }
    .card { padding: 20px; border-radius: 14px; }
    #prompt-text { font-size: 1.4rem; }
    .prompt-container { flex-direction: column; gap: 8px; align-items: center; }
    .top-nav { justify-content: space-between; gap: 8px; padding: 10px; }
    .nav-link { padding: 6px 8px; font-size: 0.8rem; }
    .control-panel { flex-direction: column; align-items: stretch; gap: 10px; padding: 10px; }
    .github-selector-container, select#github-file-select { width: 100%; min-width: 0; }
    .custom-file-upload { width: 100%; justify-content: center; }
    .inputs-container { gap: 12px; }
    .input-group input { padding: 12px; font-size: 1rem; }
    .glass-btn-accent { padding: 12px; font-size: 1rem; }
    .navigation-panel { flex-direction: column; gap: 12px; align-items: stretch; max-width: 100%; }
    .nav-boxes { justify-content: flex-start; flex-wrap: nowrap; overflow-x: auto; }
    .nav-box { width: 34px; height: 34px; flex: 0 0 auto; }
    .modal-content { margin: 0 12px; width: calc(100% - 24px); }
    .bg-gradient { background-size: cover; background-position: center; }
    .icon-btn { padding: 8px; font-size: 1.2rem; }
}

/* Hamburger / Mobile menu styles */
.hamburger {
    display: none; /* visible only on small screens */
    background: none; border: none; color: var(--text-muted); font-size: 1.4rem; cursor: pointer;
    padding: 8px 10px; margin-right: 8px;
}
.mobile-menu {
    position: fixed; top: 56px; right: 12px; background: rgba(20,20,20,0.95); border: 1px solid var(--glass-border);
    border-radius: 10px; padding: 10px; z-index: 200; width: 220px; box-shadow: 0 8px 32px rgba(0,0,0,0.6);
    display: flex; flex-direction: column; gap: 8px;
}
.mobile-menu a { color: var(--text-muted); text-decoration: none; padding: 8px; border-radius: 8px; }
.mobile-menu a:hover { background: rgba(255,255,255,0.05); color: white; }
.mobile-menu.hidden { display: none; }

@media (max-width: 800px) {
    .hamburger { display: inline-flex; }
    .top-nav .nav-link { display: none; }
}

@media (min-width: 801px) {
    .mobile-menu { display: none !important; }
}

/* --- Botón Principal (Accent) --- */
.glass-btn-accent {
    width: 100%; padding: 18px;
    background: var(--accent-gradient);
    border: none; border-radius: 12px; color: black; font-size: 1.2rem; font-weight: 800; text-transform: uppercase; letter-spacing: 2px;
    cursor: pointer; transition: 0.2s; box-shadow: 0 5px 20px rgba(255, 78, 80, 0.5);
}
.glass-btn-accent:active { transform: scale(0.98); }
.glass-btn-accent:hover { filter: brightness(1.1); }

/* --- Feedback --- */
.feedback { margin-bottom: 25px; padding: 15px; border-radius: 10px; text-align: center; font-weight: bold; font-size: 1rem; backdrop-filter: blur(10px); }
.feedback.success { background: rgba(0, 230, 118, 0.2); color: var(--accent-green); border: 1px solid var(--accent-green); }
.feedback.error { background: rgba(255, 23, 68, 0.2); color: var(--accent-red); border: 1px solid var(--accent-red); }

/* --- Navegación Inferior CORREGIDA --- */
.navigation-panel { margin-top: 40px; display: flex; align-items: center; gap: 20px; width: 100%; max-width: 600px; }

.glass-nav-btn {
    background: rgba(255, 255, 255, 0.08); border: 1px solid var(--glass-border);
    color: white; padding: 12px 24px; border-radius: 10px; cursor: pointer; font-size: 1rem; font-weight: bold;
    backdrop-filter: blur(10px); transition: 0.3s; flex-shrink: 0; /* Que no se encojan */
}
.glass-nav-btn:hover:not(:disabled) { background: rgba(255, 255, 255, 0.2); }
.glass-nav-btn:disabled { opacity: 0.4; cursor: not-allowed; }

.nav-boxes { display: flex; gap: 8px; flex-wrap: wrap; justify-content: center; flex-grow: 1; }

/* CAJITAS CORREGIDAS */
.nav-box {
    width: 38px; height: 38px; /* Más grandes */
    border-radius: 8px; cursor: pointer;
    background: rgba(255,255,255,0.1);
    border: 1px solid var(--glass-border);
    transition: 0.2s all;
    /* Centrar el número */
    display: flex; justify-content: center; align-items: center;
    font-weight: bold; font-size: 0.9rem; color: var(--text-muted);
}

.nav-box:hover { background: rgba(255,255,255,0.2); color: white; }
.nav-box.active { background: white; color: black; border-color: white; box-shadow: 0 0 10px rgba(255,255,255,0.5); transform: scale(1.1); }
/* Colores vibrantes para correcto/incorrecto */
.nav-box.correct { background: var(--accent-green); color: black; border-color: var(--accent-green); }
.nav-box.incorrect { background: var(--accent-red); color: white; border-color: var(--accent-red); }

/* --- Modal --- */
.modal { position: fixed; top: 0; left: 0; width: 100%; height: 100%; background: rgba(0,0,0,0.8); display: flex; justify-content: center; align-items: center; z-index: 100; backdrop-filter: blur(5px);}
.modal-content { text-align: center; max-width: 450px; }
.modal h2 { font-size: 2.5rem; margin-bottom: 10px; background: var(--accent-gradient); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
#score-text { font-size: 1.5rem; margin-bottom: 30px; }

input[type="file"] { display: none; }

/* ... (Mantén todo tu CSS anterior igual hasta donde dice 'Input group input') ... */

/* Añadir esto al final de tu CSS existente o actualizar la sección de inputs */

.correction-text {
    font-size: 0.85rem;
    font-weight: bold;
    color: #f9d423; /* Amarillo neón para resaltar sobre fondo oscuro */
    margin-top: 5px;
    padding-left: 5px;
    text-shadow: 0 1px 2px rgba(0,0,0,0.8);
    animation: fadeIn 0.3s ease-in-out;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(-5px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Ajustes para ocultar elementos */
.hidden { display: none !important; }