/* ============================================
   Club de Lectura - Estilos Principales
   ============================================ */

/* Variables CSS */
:root {
    --primary-color: #6366f1;
    --primary-hover: #4f46e5;
    --secondary-color: #64748b;
    --success-color: #10b981;
    --error-color: #ef4444;
    --warning-color: #f59e0b;
    --bg-color: #f8fafc;
    --card-bg: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;
    --border-color: #e2e8f0;
    --shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --radius: 12px;
    --radius-sm: 8px;
}

/* Reset y Base */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

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

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

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

.logo-link {
    text-decoration: none;
}

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

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

/* Footer */
.footer {
    margin-top: auto;
    padding: 2rem 0;
    text-align: center;
    color: var(--text-muted);
    font-size: 0.875rem;
    border-top: 1px solid var(--border-color);
}

/* Cards */
.card {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 1.5rem;
    box-shadow: var(--shadow);
    margin-bottom: 1.5rem;
}

.welcome-card {
    text-align: center;
    padding: 3rem 2rem;
}

.emoji-large {
    font-size: 4rem;
    margin-bottom: 1rem;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
    font-weight: 500;
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    text-decoration: none;
    transition: all 0.2s ease;
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

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

.btn-primary:hover:not(:disabled) {
    background: var(--primary-hover);
}

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

.btn-secondary:hover:not(:disabled) {
    background: #475569;
}

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

.btn-success:hover:not(:disabled) {
    background: #059669;
}

.btn-small {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
}

.btn-large {
    padding: 1rem 2rem;
    font-size: 1.125rem;
}

.btn-full {
    width: 100%;
}

.button-group {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
    margin-top: 1.5rem;
}

/* Forms */
.form {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.form-group label {
    font-weight: 500;
    font-size: 0.9rem;
    color: var(--text-primary);
}

.form-group input,
.form-group select,
.form-group textarea {
    padding: 0.75rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-size: 1rem;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.form-hint {
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* Alerts */
.alert {
    padding: 1rem;
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
}

.alert-error {
    background: #fef2f2;
    color: var(--error-color);
    border: 1px solid #fecaca;
}

.alert-success {
    background: #f0fdf4;
    color: var(--success-color);
    border: 1px solid #bbf7d0;
}

.hidden {
    display: none !important;
}

/* Auth Pages */
.auth-page {
    display: flex;
    justify-content: center;
    align-items: center;
    flex: 1;
    padding: 2rem 0;
}

.auth-card {
    width: 100%;
    max-width: 400px;
}

.auth-card h2 {
    text-align: center;
    margin-bottom: 0.5rem;
}

.auth-links {
    text-align: center;
    margin-top: 1.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-color);
}

.auth-links p {
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
}

.auth-links a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
}

.auth-links a:hover {
    text-decoration: underline;
}

/* Landing Page */
.landing {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 2rem 0;
}

.subtitle {
    color: var(--text-secondary);
    margin-top: 0.5rem;
}

.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    width: 100%;
    margin-top: 2rem;
}

.feature-card {
    background: var(--card-bg);
    padding: 2rem;
    border-radius: var(--radius);
    text-align: center;
    box-shadow: var(--shadow);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.feature-card h3 {
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.feature-card p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Dashboard */
.dashboard {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.user-summary {
    background: linear-gradient(135deg, var(--primary-color), #8b5cf6);
    color: white;
}

.summary-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.avatar {
    width: 60px;
    height: 60px;
    background: rgba(255,255,255,0.2);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
}

.summary-info h2 {
    margin-bottom: 0.25rem;
}

.level-badge {
    opacity: 0.9;
    font-size: 0.9rem;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
    text-align: center;
}

.stat-item {
    display: flex;
    flex-direction: column;
}

.stat-value {
    font-size: 1.5rem;
    font-weight: bold;
}

.stat-label {
    font-size: 0.8rem;
    opacity: 0.9;
}

/* Active Cycle */
.cycle-book {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem;
    background: var(--bg-color);
    border-radius: var(--radius-sm);
    margin-top: 1rem;
}

.cycle-book-icon {
    font-size: 2.5rem;
}

.cycle-book-info h4 {
    margin-bottom: 0.25rem;
}

.cycle-book-info p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.cycle-actions {
    margin-top: 1rem;
}

/* Modal */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    padding: 1rem;
}

.modal-content {
    width: 100%;
    max-width: 500px;
    max-height: 90vh;
    overflow-y: auto;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
}

.modal-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-muted);
    padding: 0.25rem;
    line-height: 1;
}

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

/* Admin Dashboard */
.admin-dashboard {
    flex: 1;
}

.tabs {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 0.5rem;
    flex-wrap: wrap;
}

.tab-btn {
    padding: 0.75rem 1.25rem;
    background: none;
    border: none;
    border-radius: var(--radius-sm) var(--radius-sm) 0 0;
    cursor: pointer;
    font-size: 0.95rem;
    color: var(--text-secondary);
    transition: all 0.2s;
}

.tab-btn:hover {
    background: var(--bg-color);
}

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

.tab-content {
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1rem;
}

/* Table Styles */
.table-container {
    overflow-x: auto;
}

table {
    width: 100%;
    border-collapse: collapse;
    background: var(--card-bg);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
}

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

th {
    background: var(--bg-color);
    font-weight: 600;
    color: var(--text-secondary);
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

tr:hover {
    background: var(--bg-color);
}

/* Exam Page */
.exam-page {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 2rem 0;
}

.exam-page > .card {
    width: 100%;
    max-width: 700px;
}

.exam-book-info {
    text-align: center;
    margin-bottom: 2rem;
}

.book-details {
    margin-top: 1rem;
}

.book-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
}

.book-author {
    color: var(--text-secondary);
}

.exam-instructions {
    background: var(--bg-color);
    padding: 1.5rem;
    border-radius: var(--radius-sm);
    margin-bottom: 1.5rem;
}

.exam-instructions ul {
    margin-left: 1.25rem;
    margin-top: 0.75rem;
}

.exam-instructions li {
    margin-bottom: 0.5rem;
}

.exam-progress {
    display: flex;
    justify-content: space-between;
    margin-bottom: 1.5rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.question-text {
    font-size: 1.1rem;
    margin-bottom: 1.5rem;
    line-height: 1.5;
}

.options-list {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.option-btn {
    display: block;
    width: 100%;
    padding: 1rem;
    text-align: left;
    background: var(--bg-color);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all 0.2s;
    font-size: 1rem;
}

.option-btn:hover {
    border-color: var(--primary-color);
    background: rgba(99, 102, 241, 0.05);
}

.option-btn.selected {
    border-color: var(--primary-color);
    background: rgba(99, 102, 241, 0.1);
}

.exam-navigation {
    display: flex;
    justify-content: space-between;
    margin-top: 2rem;
    gap: 1rem;
}

/* Results */
.results-header {
    text-align: center;
    margin-bottom: 2rem;
}

.results-icon {
    font-size: 4rem;
    margin-bottom: 1rem;
}

.results-score {
    display: flex;
    justify-content: center;
    margin-bottom: 2rem;
}

.score-circle {
    width: 150px;
    height: 150px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-color), #8b5cf6);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: white;
}

.score-circle.passed {
    background: linear-gradient(135deg, var(--success-color), #34d399);
}

.score-circle.failed {
    background: linear-gradient(135deg, var(--error-color), #f87171);
}

.score-value {
    font-size: 3rem;
    font-weight: bold;
    line-height: 1;
}

.score-label {
    font-size: 1.25rem;
}

.results-details {
    text-align: center;
}

.results-message {
    font-size: 1.1rem;
    margin-bottom: 1.5rem;
}

.results-stats {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin-top: 1.5rem;
}

.results-stats .stat {
    text-align: center;
}

.results-stats .stat-value {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--text-primary);
}

.results-stats .stat-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.results-actions {
    text-align: center;
    margin-top: 2rem;
}

/* Spinner */
.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid var(--border-color);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 1rem;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* Utilities */
.text-center {
    text-align: center;
}

.text-muted {
    color: var(--text-muted);
}

/* Responsive */
@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        text-align: center;
    }
    
    .stats-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .tabs {
        justify-content: center;
    }
    
    .section-header {
        flex-direction: column;
        text-align: center;
    }
    
    .exam-navigation {
        flex-direction: column;
    }
    
    .results-stats {
        flex-direction: column;
        gap: 1rem;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 0.75rem;
    }
    
    .card {
        padding: 1rem;
    }
    
    .welcome-card {
        padding: 2rem 1rem;
    }
    
    .emoji-large {
        font-size: 3rem;
    }
    
    .features {
        grid-template-columns: 1fr;
    }
}