/**
 * Simulacros de Examen – Dark Premium Theme
 * Responsive, mobile-first, dark mode.
 * =========================================
 */

/* =============================================
   CSS VARIABLES
   ============================================= */
:root {
    --bg-dark: #0f1117;
    --bg-card: #1a1d27;
    --bg-card-hover: #22263a;
    --bg-input: #252836;
    --bg-header: #141722;
    --text-primary: #e8eaf0;
    --text-secondary: #8b8fa3;
    --text-muted: #5f6270;
    --accent-primary: #6c63ff;
    --accent-primary-hover: #5a52e0;
    --accent-success: #2ecc71;
    --accent-success-dark: #27ae60;
    --accent-warning: #f39c12;
    --accent-danger: #e74c3c;
    --accent-info: #3498db;
    --border-color: #2a2d3e;
    --border-focus: #6c63ff;
    --shadow-card: 0 4px 24px rgba(0,0,0,0.3);
    --shadow-hover: 0 8px 32px rgba(108,99,255,0.15);
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --font-main: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

/* =============================================
   RESET & BASE
   ============================================= */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap');

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

html { font-size: 16px; scroll-behavior: smooth; }

body {
    font-family: var(--font-main);
    background: var(--bg-dark);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

a { color: var(--accent-primary); text-decoration: none; transition: var(--transition); }
a:hover { color: var(--accent-primary-hover); }

img { max-width: 100%; height: auto; }

.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }

/* =============================================
   BUTTONS
   ============================================= */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 20px;
    font-family: var(--font-main);
    font-size: 0.9rem;
    font-weight: 600;
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
    white-space: nowrap;
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent-primary), #8b5cf6);
    color: #fff;
    box-shadow: 0 4px 12px rgba(108,99,255,0.3);
}
.btn-primary:hover {
    background: linear-gradient(135deg, var(--accent-primary-hover), #7c3aed);
    transform: translateY(-1px);
    box-shadow: 0 6px 20px rgba(108,99,255,0.4);
    color: #fff;
}

.btn-success { background: var(--accent-success); color: #fff; }
.btn-success:hover { background: var(--accent-success-dark); color: #fff; }

.btn-warning { background: var(--accent-warning); color: #fff; }
.btn-danger { background: var(--accent-danger); color: #fff; }

.btn-outline {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
}
.btn-outline:hover {
    border-color: var(--accent-primary);
    color: var(--accent-primary);
}

.btn-sm { padding: 6px 12px; font-size: 0.8rem; }
.btn-lg { padding: 14px 28px; font-size: 1rem; }
.btn-block { width: 100%; }

/* =============================================
   FORMS
   ============================================= */
.form-group { margin-bottom: 16px; }

.form-group label {
    display: block;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 6px;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 10px 14px;
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-family: var(--font-main);
    font-size: 0.9rem;
    transition: var(--transition);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--border-focus);
    box-shadow: 0 0 0 3px rgba(108,99,255,0.15);
}

.form-row {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}
.form-row .flex-1 { flex: 1; min-width: 180px; }
.form-row .flex-2 { flex: 2; min-width: 250px; }

.form-section {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 24px;
    margin-bottom: 20px;
}
.form-section h2 {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 16px;
    color: var(--text-primary);
}

.form-actions {
    display: flex;
    justify-content: flex-end;
    gap: 12px;
    padding: 20px 0;
}

/* Checkbox & Radio groups */
.checkbox-group, .radio-group {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}
.checkbox-grid { gap: 6px; }
.checkbox-grid-temas { gap: 4px; }

.checkbox-label, .radio-label {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 0.82rem;
    transition: var(--transition);
}
.checkbox-label:hover, .radio-label:hover {
    border-color: var(--accent-primary);
}
.checkbox-label small {
    color: var(--text-muted);
    font-size: 0.72rem;
}
.tema-label {
    min-width: 52px;
    justify-content: center;
    font-weight: 600;
}

/* Captcha */
.captcha-group label {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--accent-primary);
}

/* =============================================
   ALERTS
   ============================================= */
.alert {
    padding: 12px 16px;
    border-radius: var(--radius-sm);
    font-size: 0.87rem;
    margin-bottom: 16px;
}
.alert-error {
    background: rgba(231, 76, 60, 0.15);
    border: 1px solid rgba(231, 76, 60, 0.3);
    color: #e74c3c;
}
.alert-success {
    background: rgba(46, 204, 113, 0.15);
    border: 1px solid rgba(46, 204, 113, 0.3);
    color: #2ecc71;
}

/* =============================================
   BADGES
   ============================================= */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 4px 10px;
    border-radius: 20px;
    font-size: 0.72rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}
.badge-borrador { background: rgba(95,98,112,0.3); color: var(--text-secondary); }
.badge-programado { background: rgba(52,152,219,0.2); color: var(--accent-info); }
.badge-activo { background: rgba(46,204,113,0.2); color: var(--accent-success); }
.badge-finalizado { background: rgba(108,99,255,0.2); color: var(--accent-primary); }
.badge-cancelado { background: rgba(231,76,60,0.2); color: var(--accent-danger); }

/* =============================================
   LOGIN PAGE
   ============================================= */
.login-page {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    background: linear-gradient(135deg, #0f1117 0%, #1a1d27 50%, #141722 100%);
}

.login-container { width: 100%; max-width: 420px; padding: 20px; }

.login-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 40px 32px;
    box-shadow: var(--shadow-card);
}

.login-header {
    text-align: center;
    margin-bottom: 32px;
}
.login-header h1 {
    font-size: 1.5rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--accent-primary), #8b5cf6);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.login-header p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-top: 4px;
}

/* =============================================
   ADMIN HEADER & LAYOUT
   ============================================= */
.admin-header {
    background: var(--bg-header);
    border-bottom: 1px solid var(--border-color);
    padding: 16px 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: sticky;
    top: 0;
    z-index: 100;
}
.header-left { display: flex; align-items: center; gap: 16px; }
.header-left h1 { font-size: 1.2rem; font-weight: 700; }
.header-right { display: flex; align-items: center; gap: 12px; }
.admin-name { color: var(--text-secondary); font-size: 0.85rem; }

.admin-main { max-width: 1300px; margin: 0 auto; padding: 24px; }

.panel-toolbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 20px;
}
.panel-toolbar h2 { font-size: 1.3rem; font-weight: 700; }

/* =============================================
   DATA TABLE
   ============================================= */
.table-responsive { overflow-x: auto; }

.data-table {
    width: 100%;
    border-collapse: collapse;
    background: var(--bg-card);
    border-radius: var(--radius-md);
    overflow: hidden;
    border: 1px solid var(--border-color);
}

.data-table thead { background: var(--bg-header); }
.data-table th {
    padding: 12px 16px;
    text-align: left;
    font-size: 0.78rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.data-table td {
    padding: 12px 16px;
    font-size: 0.88rem;
    border-top: 1px solid var(--border-color);
}

.data-table tbody tr { transition: var(--transition); }
.data-table tbody tr:hover { background: var(--bg-card-hover); }

.actions { display: flex; gap: 6px; }

.empty-state {
    text-align: center;
    padding: 40px;
    color: var(--text-muted);
}

/* =============================================
   PREVIEW BOX
   ============================================= */
.preview-box {
    display: flex;
    align-items: center;
    gap: 12px;
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: 12px 16px;
    margin-top: 16px;
}
.preview-label { color: var(--text-secondary); font-size: 0.85rem; }
.preview-count {
    font-size: 1.3rem;
    font-weight: 800;
}
.count-ok { color: var(--accent-success); }
.count-warning { color: var(--accent-danger); }

/* =============================================
   PUBLIC PAGE
   ============================================= */
.public-header {
    background: linear-gradient(135deg, var(--bg-header), #1a1d2e);
    border-bottom: 1px solid var(--border-color);
    padding: 40px 0;
    text-align: center;
}
.public-header h1 {
    font-size: 2rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--accent-primary), #8b5cf6, #a78bfa);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.subtitle {
    color: var(--text-secondary);
    font-size: 1rem;
    margin-top: 4px;
}

.public-main { padding: 32px 0; }

.simulacros-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: 20px;
}

.simulacro-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 24px;
    transition: var(--transition);
    display: flex;
    flex-direction: column;
}
.simulacro-card:hover {
    border-color: var(--accent-primary);
    box-shadow: var(--shadow-hover);
    transform: translateY(-2px);
}

.card-header-sim {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 12px;
}
.card-date { color: var(--text-muted); font-size: 0.82rem; }

.card-title-sim {
    font-size: 1.15rem;
    font-weight: 700;
    margin-bottom: 8px;
    line-height: 1.3;
}

.card-desc {
    color: var(--text-secondary);
    font-size: 0.85rem;
    margin-bottom: 16px;
    flex-grow: 1;
}

.card-meta {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
    font-size: 0.82rem;
    color: var(--text-muted);
    margin-bottom: 16px;
}

.card-footer-sim { margin-top: auto; }

.countdown-container {
    text-align: center;
    padding: 10px;
    background: var(--bg-input);
    border-radius: var(--radius-sm);
}
.countdown-label {
    font-size: 0.78rem;
    color: var(--text-muted);
    display: block;
}
.countdown-timer {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--accent-info);
    font-variant-numeric: tabular-nums;
}

.empty-state-public {
    text-align: center;
    padding: 80px 20px;
}
.empty-state-public h2 { font-size: 1.3rem; color: var(--text-secondary); margin-bottom: 8px; }
.empty-state-public p { color: var(--text-muted); }

/* =============================================
   MODAL
   ============================================= */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.7);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    padding: 20px;
}
.modal-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 32px;
    max-width: 500px;
    width: 100%;
    position: relative;
    box-shadow: 0 20px 60px rgba(0,0,0,0.5);
    animation: modalIn 0.3s ease;
}
@keyframes modalIn {
    from { transform: translateY(20px); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}
.modal-close {
    position: absolute;
    top: 12px;
    right: 16px;
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 1.5rem;
    cursor: pointer;
}
.modal-close:hover { color: var(--text-primary); }
.modal-card h2 {
    font-size: 1.2rem;
    margin-bottom: 20px;
    font-weight: 700;
}

/* =============================================
   EXAM PAGE
   ============================================= */
.examen-body { padding-top: 60px; }

.examen-topbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 200;
    background: var(--bg-header);
    border-bottom: 1px solid var(--border-color);
    padding: 12px 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.topbar-left .alumno-name { color: var(--text-secondary); font-size: 0.85rem; }
.topbar-center h2 { font-size: 1rem; font-weight: 600; }
.topbar-right {}

.countdown-exam {
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: 6px 16px;
    font-variant-numeric: tabular-nums;
}
#countdown-time {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--accent-success);
}
.countdown-warning { border-color: var(--accent-warning) !important; }
.countdown-warning #countdown-time { color: var(--accent-warning) !important; }
.countdown-danger { border-color: var(--accent-danger) !important; animation: pulse 1s infinite; }
.countdown-danger #countdown-time { color: var(--accent-danger) !important; }

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.6; }
}

.progress-bar-container {
    position: fixed;
    top: 56px;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--bg-input);
    z-index: 199;
}
.progress-bar {
    height: 100%;
    background: linear-gradient(90deg, var(--accent-primary), #8b5cf6);
    transition: width 0.3s ease;
}

.examen-main {
    max-width: 800px;
    margin: 0 auto;
    padding: 24px 20px 100px;
}

.pregunta-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 24px;
    margin-bottom: 16px;
    transition: var(--transition);
}
.pregunta-card:hover { border-color: #3a3d50; }

.pregunta-numero {
    font-size: 0.78rem;
    font-weight: 600;
    color: var(--accent-primary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 8px;
}
.pregunta-enunciado {
    font-size: 0.95rem;
    line-height: 1.5;
    margin-bottom: 16px;
    color: var(--text-primary);
}

.opciones { display: flex; flex-direction: column; gap: 8px; }

.opcion-label {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    padding: 10px 14px;
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: var(--transition);
}
.opcion-label:hover { border-color: var(--accent-primary); background: var(--bg-card-hover); }

.opcion-input { display: none; }
.opcion-input:checked + .opcion-letra {
    background: var(--accent-primary);
    color: #fff;
}
.opcion-input:checked ~ .opcion-texto { color: var(--text-primary); }

.opcion-letra {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 28px;
    height: 28px;
    border-radius: 50%;
    background: var(--bg-dark);
    color: var(--text-secondary);
    font-size: 0.78rem;
    font-weight: 700;
    flex-shrink: 0;
    transition: var(--transition);
}

.opcion-texto {
    font-size: 0.88rem;
    color: var(--text-secondary);
    padding-top: 3px;
    transition: var(--transition);
}

.examen-footer {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: var(--bg-header);
    border-top: 1px solid var(--border-color);
    padding: 12px 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    z-index: 200;
}
.resumen-respuestas { color: var(--text-secondary); font-size: 0.85rem; }
.resumen-respuestas span { font-weight: 700; color: var(--accent-primary); }

/* =============================================
   RESULTS PAGE
   ============================================= */
.resultados-header {
    background: linear-gradient(135deg, var(--bg-header), #1a1d2e);
    border-bottom: 1px solid var(--border-color);
    padding: 32px 0;
    text-align: center;
}
.resultados-header h1 { font-size: 1.5rem; font-weight: 700; }
.resultados-header p { color: var(--text-secondary); margin-top: 4px; }

.resultados-main { padding: 32px 0 60px; }

.resultados-resumen {
    text-align: center;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 40px 24px;
    margin-bottom: 24px;
}

.nota-grande { margin-bottom: 24px; }
.nota-valor { font-size: 4rem; font-weight: 800; }
.nota-sobre { font-size: 1.5rem; color: var(--text-muted); }
.nota-aprobado { color: var(--accent-success); }
.nota-suspendido { color: var(--accent-danger); }

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 12px;
    max-width: 500px;
    margin: 0 auto 16px;
}

.stat-card {
    background: var(--bg-input);
    border-radius: var(--radius-sm);
    padding: 16px 8px;
    text-align: center;
}
.stat-number { font-size: 1.5rem; font-weight: 800; }
.stat-label { font-size: 0.72rem; color: var(--text-muted); text-transform: uppercase; }
.stat-aciertos .stat-number { color: var(--accent-success); }
.stat-fallos .stat-number { color: var(--accent-danger); }
.stat-blanco .stat-number { color: var(--text-muted); }
.stat-total .stat-number { color: var(--accent-info); }

.estado-intento { color: var(--text-secondary); font-size: 0.85rem; }

/* Espera */
.espera-card {
    text-align: center;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 40px;
}
.espera-card h2 { font-size: 1.3rem; margin-bottom: 12px; }
.espera-card p { color: var(--text-secondary); margin-bottom: 8px; }

/* Ranking */
.ranking-section, .plantilla-section {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 24px;
    margin-bottom: 24px;
}
.ranking-section h2, .plantilla-section h2 {
    font-size: 1.2rem;
    margin-bottom: 16px;
}

.ranking-table .ranking-pos { font-size: 1.1rem; }
.ranking-yo { background: rgba(108,99,255,0.1) !important; }

/* Plantilla correctora */
.plantilla-pregunta {
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: 16px;
    margin-bottom: 12px;
}
.pregunta-correcta { border-left: 4px solid var(--accent-success); }
.pregunta-incorrecta { border-left: 4px solid var(--accent-danger); }
.pregunta-blanco { border-left: 4px solid var(--text-muted); }

.plantilla-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 8px;
}
.plantilla-num {
    background: var(--bg-input);
    border-radius: 50%;
    width: 28px;
    height: 28px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 0.78rem;
    font-weight: 700;
}
.plantilla-resultado { font-size: 0.82rem; font-weight: 600; }

.plantilla-enunciado { font-size: 0.9rem; margin-bottom: 10px; }

.plantilla-opciones {
    display: flex;
    flex-direction: column;
    gap: 4px;
}
.plantilla-opcion {
    padding: 6px 10px;
    font-size: 0.82rem;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    gap: 8px;
}
.opcion-correcta { background: rgba(46,204,113,0.15); color: var(--accent-success); }
.opcion-incorrecta { background: rgba(231,76,60,0.15); color: var(--accent-danger); }

.plantilla-explicacion {
    margin-top: 8px;
    padding: 10px;
    background: var(--bg-input);
    border-radius: var(--radius-sm);
    font-size: 0.82rem;
    color: var(--text-secondary);
}

.resultados-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 0;
}

/* =============================================
   RESPONSIVE
   ============================================= */
@media (max-width: 768px) {
    .admin-header { flex-direction: column; gap: 12px; padding: 12px 16px; }
    .header-left, .header-right { width: 100%; justify-content: center; text-align: center; }
    .panel-toolbar { flex-direction: column; gap: 12px; align-items: stretch; }

    .simulacros-grid { grid-template-columns: 1fr; }
    .stats-grid { grid-template-columns: repeat(2, 1fr); }

    .examen-topbar { padding: 8px 12px; }
    .topbar-center h2 { font-size: 0.85rem; }

    .form-row { flex-direction: column; }
    .form-row .flex-1, .form-row .flex-2 { min-width: 100%; }

    .examen-footer { flex-direction: column; gap: 8px; }

    .nota-valor { font-size: 3rem; }

    .resultados-footer { flex-direction: column; gap: 12px; }
}

@media (max-width: 480px) {
    .public-header h1 { font-size: 1.4rem; }
    .login-card { padding: 28px 20px; }
    .modal-card { padding: 24px 16px; }
}