/* css/style.css */
:root {
    /* MODO OSCURO (Por defecto para glass vivo) */
    --glass-bg: rgba(25, 25, 35, 0.4);
    --glass-border: rgba(255, 255, 255, 0.15);
    --glass-blur: blur(16px);
    --text-color: #ffffff;
    --text-muted: rgba(255, 255, 255, 0.7);
    --primary-color: #00e5ff; /* Cyan más vivo */
    --secondary-color: #ff007f; /* Rosa vivo */
    --bg-gradient: linear-gradient(135deg, #0f2027, #203a43, #2c5364); /* Fondo animado vibrante */
    --input-bg: rgba(255, 255, 255, 0.1);
    --card-bg: rgba(255, 255, 255, 0.03);
}

[data-theme="light"] {
    /* MODO CLARO */
    --glass-bg: rgba(255, 255, 255, 0.7);
    --glass-border: rgba(0, 0, 0, 0.1);
    --glass-blur: blur(20px);
    --text-color: #1a2a3a;
    --text-muted: #5a6a7a;
    --primary-color: #0288d1;
    --secondary-color: #d81b60;
    --bg-gradient: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    --input-bg: rgba(0, 0, 0, 0.04);
    --card-bg: rgba(0, 0, 0, 0.02);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: 'Inter', 'Segoe UI', sans-serif;
    transition: background 0.3s, color 0.3s;
}

body {
    background: var(--bg-gradient);
    background-size: 400% 400%;
    animation: gradientBG 15s ease infinite;
    min-height: 100vh;
    color: var(--text-color);
    display: flex;
    flex-direction: column;
}

@keyframes gradientBG {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: 'Inter', 'Segoe UI', sans-serif;
}

body {
    background: var(--bg-gradient);
    min-height: 100vh;
    color: var(--text-color);
    display: flex;
    flex-direction: column;
}

.glass-container {
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    padding: 2.5rem;
    box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.3);
    margin: 2rem auto;
    max-width: 800px;
    width: 90%;
    position: relative;
    overflow: hidden;
}

.glass-container::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0; height: 1px;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.5), transparent);
}

h1, h2, h3 {
    margin-bottom: 1rem;
    text-align: center;
}

/* Formularios */
.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
}

input[type="text"],
input[type="password"],
input[type="email"],
input[type="datetime-local"],
input[type="date"],
input[type="number"],
select,
textarea {
    width: 100%;
    padding: 1rem;
    border-radius: 12px;
    border: 1px solid var(--glass-border);
    background: var(--input-bg);
    color: var(--text-color);
    outline: none;
    transition: all 0.3s ease;
    font-size: 1rem;
}

/* Solo para campos que requieren flecha (Select, Date, etc.) */
select, 
input[type="date"], 
input[type="datetime-local"] {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='white' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 1rem center;
    background-size: 1.2rem;
    padding-right: 3rem;
}

/* Evitar fondo blanco en opciones de select en modo oscuro */
select option {
    background-color: #1a1a2e;
    color: white;
}

[data-theme="light"] select option {
    background-color: white;
    color: #2c3e50;
}

/* Estilo para input date (calendario) */
input[type="date"]::-webkit-calendar-picker-indicator {
    filter: invert(1);
    cursor: pointer;
    opacity: 0.6;
    transition: opacity 0.3s;
}

input[type="date"]::-webkit-calendar-picker-indicator:hover {
    opacity: 1;
}

input[type="date"] {
    background-image: none; /* No flecha en date */
}

input:focus, select:focus, textarea:focus {
    background: rgba(255, 255, 255, 0.2);
    border-color: var(--primary-color);
    box-shadow: 0 0 10px rgba(0, 229, 255, 0.3);
}

/* Botones */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.8rem 1.8rem;
    border: none;
    border-radius: 12px;
    cursor: pointer;
    font-weight: 600;
    text-decoration: none;
    color: var(--text-color);
    transition: transform 0.2s, box-shadow 0.2s, background 0.3s;
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    border: 1px solid var(--glass-border);
}

.btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(0,0,0,0.3);
    background: rgba(255, 255, 255, 0.25);
}

.btn-primary { 
    background: var(--primary-color); 
    color: #000;
    border: none; 
    box-shadow: 0 4px 15px rgba(0, 229, 255, 0.4);
}
.btn-primary:hover { 
    background: #00b8cc; 
    box-shadow: 0 6px 20px rgba(0, 229, 255, 0.6);
}

/* Tablas */
.glass-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 1rem;
}

.glass-table th, .glass-table td {
    padding: 1rem;
    text-align: left;
    border-bottom: 1px solid var(--glass-border);
}

.glass-table th {
    background: rgba(0, 0, 0, 0.2);
}

/* Navbar */
.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 3rem;
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    border-bottom: 1px solid var(--glass-border);
    box-shadow: 0 4px 30px rgba(0,0,0,0.1);
}

.navbar-brand {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--text-color);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 12px;
    letter-spacing: 1px;
}

.navbar-brand img {
    height: 40px; /* Tamaño del logo */
    object-fit: contain;
    filter: drop-shadow(0 2px 4px rgba(0,0,0,0.2));
}

.navbar-links {
    display: flex;
    align-items: center;
}

.navbar-links a {
    color: var(--text-color);
    text-decoration: none;
    margin-left: 2rem;
    font-weight: 500;
    transition: color 0.3s;
    position: relative;
}

.navbar-links a::after {
    content: '';
    position: absolute;
    width: 0%;
    height: 2px;
    bottom: -4px;
    left: 0;
    background-color: var(--primary-color);
    transition: width 0.3s;
}

.navbar-links a:hover {
    color: var(--primary-color);
}
.navbar-links a:hover::after {
    width: 100%;
}

/* Theme Toggle Button */
.theme-toggle {
    background: none;
    border: none;
    color: var(--text-color);
    font-size: 1.5rem;
    cursor: pointer;
    margin-left: 2rem;
    transition: transform 0.3s;
}
.theme-toggle:hover {
    transform: rotate(30deg);
}

/* Status Badges */
.status-badge {
    padding: 0.4rem 0.8rem;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}
.status-active { background: var(--primary-color); color: #000; box-shadow: 0 0 10px rgba(0, 229, 255, 0.4); }
.status-future { background: #f1c40f; color: #000; }
.status-past { background: #95a5a5; color: #fff; }

/* Grid responsive fix */
.exams-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2rem;
    margin-top: 1rem;
}

/* --- MEDIA QUERIES PARA RESPONSIVIDAD --- */

/* Tablets y pantallas medianas */
@media (max-width: 992px) {
    .navbar {
        padding: 1rem 1.5rem;
    }
    .exams-grid {
        grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
        gap: 1.5rem;
    }
}

/* CELULARES (Mobile) */
@media (max-width: 768px) {
    .navbar {
        flex-direction: column;
        gap: 1rem;
        padding: 1rem;
        text-align: center;
    }

    .navbar-brand {
        font-size: 1.15rem;
        justify-content: center;
    }

    .navbar-links {
        width: 100%;
        justify-content: center;
        flex-wrap: wrap;
        gap: 0.6rem;
    }

    .navbar-links a {
        margin: 0 0.4rem;
        font-size: 0.85rem;
    }

    .theme-toggle {
        margin-left: 0.5rem;
    }

    /* Reducción general de padding para ganar espacio */
    .glass-container {
        padding: 1rem;
        margin-bottom: 1rem;
    }

    h1 { font-size: 1.5rem; }
    h2 { font-size: 1.3rem; }
    h3 { font-size: 1.1rem; }
    body { font-size: 0.95rem; }

    /* Ajuste de formulario en móvil */
    .form-group {
        margin-bottom: 1rem;
    }

    .exams-grid {
        grid-template-columns: 1fr;
        gap: 1.2rem;
    }

    /* Botones más grandes para dedos (touch targets) */
    .btn {
        padding: 0.8rem 1.2rem;
        width: 100%;
        justify-content: center;
    }

    /* Tablas responsivas */
    .glass-table th, .glass-table td {
        padding: 0.8rem 0.5rem;
        font-size: 0.85rem;
    }
}

/* Pantallas extra pequeñas */
@media (max-width: 480px) {
    .navbar-brand img {
        height: 30px;
    }
    .navbar-brand {
        font-size: 1.1rem;
    }
    .navbar-links a {
        font-size: 0.8rem;
    }
}

.main-content {
    flex: 1;
    padding: 2rem;
    transition: padding 0.3s ease;
}

@media (max-width: 768px) {
    .main-content {
        padding: 1rem;
    }
}

/* Estilos para preguntas (Exam y Review) */
.question-card-box {
    margin-bottom: 2rem;
    padding: 2.5rem;
    border-radius: 24px;
    border: 1px solid rgba(255,255,255,0.05);
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    position: relative;
    overflow: hidden;
}

.question-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 1.5rem;
    margin-bottom: 1.5rem;
}

.question-title {
    font-size: 1.4rem;
    color: #fff;
    line-height: 1.5;
    margin: 0;
    flex: 1;
    text-align: left;
}

.question-badge {
    white-space: nowrap;
    font-weight: 700;
    padding: 0.5rem 1rem;
    border-radius: 10px;
    font-size: 0.85rem;
}

@media (max-width: 768px) {
    .question-card-box {
        padding: 1rem;
        margin-bottom: 1.2rem;
    }
    .question-header {
        flex-direction: column;
        gap: 0.6rem;
    }
    .question-title {
        font-size: 1.05rem;
    }
    .question-badge {
        font-size: 0.7rem;
        padding: 0.3rem 0.6rem;
    }
}

.options-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1rem;
}

@media (max-width: 768px) {
    .options-grid {
        grid-template-columns: 1fr;
        gap: 0.6rem;
    }
    .options-grid div, .option-text {
        font-size: 0.9rem;
    }
}

.glass-container-wide {
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    padding: 2.5rem;
    box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.3);
    margin: 2rem auto;
    max-width: 1400px;
    width: 95%;
    position: relative;
    overflow: hidden;
}

.search-container {
    margin-bottom: 2rem;
    display: flex;
    justify-content: center;
}

.search-box {
    position: relative;
    width: 100%;
    max-width: 600px;
}

.search-box input {
    width: 100%;
    padding: 1rem 1rem 1rem 3rem;
    font-size: 1.1rem;
    border-radius: 12px;
}

.search-box i, .search-box .icon {
    position: absolute;
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
    opacity: 0.5;
    font-size: 1.25rem;
}

@media (max-width: 768px) {
    .glass-container-wide {
        padding: 1rem;
        width: 100%;
        border-radius: 0;
        border-left: none;
        border-right: none;
    }
    .search-box input {
        font-size: 1rem;
        padding: 0.8rem 0.8rem 0.8rem 2.5rem;
    }
}