/* Variables CSS */
:root {
    --bg-primary: #1a1a1a;
    --bg-secondary: #2d2d2d;
    --bg-tertiary: #3a3a3a;
    --text-primary: #e0e0e0;
    --text-secondary: #b0b0b0;
    --accent-primary: #4a9eff;
    --accent-secondary: #5cb85c;
    --accent-danger: #d9534f;
    --accent-warning: #f0ad4e;
    --border-color: #404040;
    --shadow: rgba(0, 0, 0, 0.3);
}

/* Reset y base */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Header */
.header {
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 0;
    box-shadow: 0 2px 4px var(--shadow);
}

.header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
}

.header h1 {
    font-size: 1.5rem;
    color: var(--accent-primary);
    margin: 0;
}

.nav {
    display: flex;
    gap: 1rem;
    align-items: center;
    flex-wrap: wrap;
}

.nav-link {
    color: var(--text-primary);
    text-decoration: none;
    padding: 0.5rem 1rem;
    border-radius: 4px;
    transition: background-color 0.3s;
}

.nav-link:hover {
    background-color: var(--bg-tertiary);
}

.nav-user {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
    width: 100%;
}

/* Main */
.main {
    flex: 1;
    padding: 2rem 0;
}

/* Typography */
h2 {
    margin-bottom: 1.5rem;
    color: var(--text-primary);
    font-size: 1.75rem;
}

h3 {
    margin-bottom: 1rem;
    color: var(--text-primary);
    font-size: 1.25rem;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.6rem 1.2rem;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    text-decoration: none;
    font-size: 0.95rem;
    transition: all 0.3s;
    font-family: inherit;
}

.btn-primary {
    background-color: var(--accent-primary);
    color: white;
}

.btn-primary:hover {
    background-color: #3a8eef;
    transform: translateY(-1px);
}

.btn-secondary {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
}

.btn-secondary:hover {
    background-color: #4a4a4a;
}

.btn-success {
    background-color: var(--accent-secondary);
    color: white;
}

.btn-success:hover {
    background-color: #4cae4c;
}

.btn-info {
    background-color: #5bc0de;
    color: white;
}

.btn-info:hover {
    background-color: #46b8da;
}

.btn-danger {
    background-color: var(--accent-danger);
    color: white;
}

.btn-danger:hover {
    background-color: #c9302c;
}

.btn-sm {
    padding: 0.4rem 0.8rem;
    font-size: 0.85rem;
}

.btn:disabled,
.btn[disabled] {
    opacity: 0.5;
    cursor: not-allowed;
    pointer-events: none;
}

.btn:disabled:hover,
.btn[disabled]:hover {
    transform: none;
    background-color: inherit;
}

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

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
    font-weight: 500;
}

.form-group input[type="text"],
.form-group input[type="password"],
.form-group input[type="email"],
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.75rem;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    color: var(--text-primary);
    font-size: 1rem;
    font-family: inherit;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 2px rgba(74, 158, 255, 0.2);
}

.form-actions {
    display: flex;
    gap: 1rem;
    margin-top: 1.5rem;
}

/* Tables */
.table-responsive {
    overflow-x: auto;
    margin: 1.5rem 0;
}

.table {
    width: 100%;
    border-collapse: collapse;
    background-color: var(--bg-secondary);
    border-radius: 4px;
    overflow: hidden;
}

.table thead {
    background-color: var(--bg-tertiary);
}

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

.table th {
    font-weight: 600;
    color: var(--text-primary);
}

.table td {
    color: var(--text-secondary);
}

.table tbody tr:hover {
    background-color: var(--bg-tertiary);
}

.table .actions {
    white-space: nowrap;
}

.table .actions .btn {
    margin-right: 0.5rem;
}

/* Login */
.login-container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 60vh;
}

.login-box {
    background-color: var(--bg-secondary);
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 4px 6px var(--shadow);
    width: 100%;
    max-width: 400px;
}

.login-box h2 {
    margin-bottom: 1.5rem;
    text-align: center;
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.7);
    overflow-y: auto;
}

.modal-content {
    background-color: var(--bg-secondary);
    margin: 5% auto;
    padding: 2rem;
    border-radius: 8px;
    width: 90%;
    max-width: 600px;
    box-shadow: 0 4px 20px var(--shadow);
    position: relative;
}

.modal-large {
    max-width: 800px;
}

.close {
    position: absolute;
    right: 1rem;
    top: 1rem;
    font-size: 2rem;
    font-weight: bold;
    color: var(--text-secondary);
    cursor: pointer;
    line-height: 1;
}

.close:hover {
    color: var(--text-primary);
}

/* Messages */
.message {
    padding: 0.75rem;
    border-radius: 4px;
    margin: 1rem 0;
    display: none;
}

.message.success {
    background-color: rgba(92, 184, 92, 0.2);
    color: var(--accent-secondary);
    border: 1px solid var(--accent-secondary);
    display: block;
}

.message.error {
    background-color: rgba(217, 83, 79, 0.2);
    color: var(--accent-danger);
    border: 1px solid var(--accent-danger);
    display: block;
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: 3rem 1rem;
    color: var(--text-secondary);
}

.empty-state p {
    margin-bottom: 1rem;
    font-size: 1.1rem;
}

/* Actions Bar */
.actions-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.sort-controls {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.sort-controls label {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.sort-controls select {
    padding: 0.5rem;
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    color: var(--text-primary);
    font-size: 0.9rem;
}

/* Preguntas */
.preguntas-list {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.pregunta-card {
    background-color: var(--bg-secondary);
    padding: 1.5rem;
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.pregunta-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.pregunta-texto {
    margin-bottom: 1rem;
    color: var(--text-primary);
    font-size: 1.05rem;
}

.opciones-list {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.opcion-item {
    padding: 0.75rem;
    background-color: var(--bg-tertiary);
    border-radius: 4px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.opcion-item.correcta {
    border-left: 4px solid var(--accent-secondary);
}

.badge {
    background-color: var(--accent-secondary);
    color: white;
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 600;
}

.opcion-form-item {
    display: flex;
    gap: 1rem;
    align-items: center;
    margin-bottom: 1rem;
    flex-wrap: wrap;
}

.opcion-form-item input[type="text"] {
    flex: 1;
    min-width: 200px;
}

.opcion-form-item label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin: 0;
    white-space: nowrap;
}

/* Examen */
.examen-progress {
    margin-bottom: 2rem;
}

.progress-bar {
    width: 100%;
    height: 8px;
    background-color: var(--bg-tertiary);
    border-radius: 4px;
    overflow: hidden;
    margin-top: 0.5rem;
}

.progress-fill {
    height: 100%;
    background-color: var(--accent-primary);
    transition: width 0.3s;
}

.pregunta-actual {
    background-color: var(--bg-secondary);
    padding: 2rem;
    border-radius: 8px;
    margin-bottom: 2rem;
}

.pregunta-actual h3 {
    margin-bottom: 1.5rem;
    font-size: 1.3rem;
}

.opciones-examen {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.opcion-examen {
    display: flex;
    align-items: center;
    padding: 1rem;
    background-color: var(--bg-tertiary);
    border-radius: 4px;
    cursor: pointer;
    transition: background-color 0.3s;
    border: 2px solid transparent;
}

.opcion-examen:hover {
    background-color: var(--bg-primary);
}

.opcion-examen input[type="radio"] {
    margin-right: 1rem;
    width: 20px;
    height: 20px;
    cursor: pointer;
}

.opcion-examen input[type="radio"]:checked + span {
    font-weight: 600;
    color: var(--accent-primary);
}

.opcion-examen:has(input[type="radio"]:checked) {
    border-color: var(--accent-primary);
    background-color: rgba(74, 158, 255, 0.1);
}

.examen-actions {
    display: flex;
    justify-content: space-between;
    gap: 1rem;
}

/* Resultado */
.resultado-box {
    background-color: var(--bg-secondary);
    padding: 2rem;
    border-radius: 8px;
    text-align: center;
    max-width: 600px;
    margin: 0 auto;
}

.resultado-stats {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    margin: 2rem 0;
}

.stat-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem;
    background-color: var(--bg-tertiary);
    border-radius: 4px;
}

.stat-label {
    font-weight: 500;
    color: var(--text-secondary);
}

.stat-value {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--accent-primary);
}

.porcentaje-badge {
    display: inline-block;
    padding: 0.5rem 1rem;
    border-radius: 4px;
    font-weight: 600;
    font-size: 1.1rem;
}

.porcentaje-badge.success {
    background-color: rgba(92, 184, 92, 0.2);
    color: var(--accent-secondary);
}

.porcentaje-badge.warning {
    background-color: rgba(240, 173, 78, 0.2);
    color: var(--accent-warning);
}

.porcentaje-badge.danger {
    background-color: rgba(217, 83, 79, 0.2);
    color: var(--accent-danger);
}

.resultado-actions {
    margin-top: 2rem;
}

/* Detalle de respuestas */
.detalle-respuestas {
    margin-top: 2rem;
}

.detalle-respuestas h3 {
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

.detalle-pregunta {
    background-color: var(--bg-secondary);
    padding: 1.5rem;
    border-radius: 8px;
    margin-bottom: 1.5rem;
    border-left: 4px solid var(--bg-tertiary);
}

.detalle-pregunta.correcta {
    border-left-color: var(--accent-secondary);
}

.detalle-pregunta.incorrecta {
    border-left-color: var(--accent-danger);
}

.detalle-pregunta-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.detalle-pregunta-header h4 {
    margin: 0;
    color: var(--text-primary);
}

.resultado-icon {
    font-size: 1.5rem;
    font-weight: bold;
    padding: 0.25rem 0.75rem;
    border-radius: 4px;
}

.resultado-icon.correcta {
    color: var(--accent-secondary);
    background-color: rgba(92, 184, 92, 0.2);
}

.resultado-icon.incorrecta {
    color: var(--accent-danger);
    background-color: rgba(217, 83, 79, 0.2);
}

.detalle-pregunta-texto {
    color: var(--text-primary);
    font-size: 1.05rem;
    margin-bottom: 1rem;
    font-weight: 500;
}

.detalle-opciones {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.detalle-opcion-elegida,
.detalle-opcion-correcta {
    padding: 0.75rem;
    border-radius: 4px;
    background-color: var(--bg-tertiary);
}

.detalle-opcion-elegida {
    color: var(--text-primary);
}

.detalle-opcion-correcta {
    color: var(--accent-secondary);
    background-color: rgba(92, 184, 92, 0.1);
    border: 1px solid var(--accent-secondary);
}

.detalle-opcion-elegida strong,
.detalle-opcion-correcta strong {
    display: block;
    margin-bottom: 0.25rem;
    font-size: 0.9rem;
    opacity: 0.8;
}

/* Footer */
.footer {
    background-color: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: 1.5rem 0;
    margin-top: 2rem;
    text-align: center;
    color: var(--text-secondary);
}

/* Responsive */
@media (max-width: 768px) {
    .header .container {
        flex-direction: column;
        align-items: flex-start;
    }

    .nav {
        margin-top: 1rem;
        width: 100%;
    }

    .header h1 {
        font-size: 1.25rem;
    }

    .table {
        font-size: 0.9rem;
    }

    .table th,
    .table td {
        padding: 0.75rem 0.5rem;
    }

    .modal-content {
        margin: 10% auto;
        padding: 1.5rem;
        width: 95%;
    }

    .actions-bar {
        flex-direction: column;
        align-items: stretch;
    }

    .pregunta-header {
        flex-direction: column;
        align-items: flex-start;
    }

    .opcion-form-item {
        flex-direction: column;
        align-items: stretch;
    }

    .opcion-form-item input[type="text"] {
        min-width: 100%;
    }

    .examen-actions {
        flex-direction: column;
    }

    .examen-actions .btn {
        width: 100%;
    }

    .stat-item {
        flex-direction: column;
        gap: 0.5rem;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 0.75rem;
    }

    .main {
        padding: 1rem 0;
    }

    h2 {
        font-size: 1.5rem;
    }

    .btn {
        padding: 0.5rem 1rem;
        font-size: 0.9rem;
    }

    .table {
        font-size: 0.85rem;
    }

    .table th,
    .table td {
        padding: 0.5rem 0.25rem;
    }

    .pregunta-actual {
        padding: 1.5rem;
    }
}