/* ============================================
   LAYOUT.CSS - Estructura y Grid
   ============================================ */

:root {
    --primary-color: #667eea;
    --primary-dark: #5568d3;
    --secondary-color: #764ba2;
    --success-color: #4caf50;
    --warning-color: #ff9800;
    --error-color: #f44336;
    --info-color: #2196f3;
    
    --bg-color: #f5f7fa;
    --surface-color: #ffffff;
    --text-primary: #2c3e50;
    --text-secondary: #546e7a;
    --border-color: #e0e0e0;
    
    --sidebar-width: 280px;
    --header-height: 64px;
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    
    --border-radius: 8px;
    --border-radius-lg: 12px;
    --transition: all 0.3s ease;
}

* {
    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-color);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

/* Header */
.app-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
    z-index: 1000;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
    padding: 0 var(--spacing-lg);
    max-width: 1920px;
    margin: 0 auto;
}

.app-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin: 0;
}

.header-actions {
    display: flex;
    gap: var(--spacing-md);
}

/* Main Container */
.app-container {
    display: flex;
    margin-top: var(--header-height);
    min-height: calc(100vh - var(--header-height));
}

/* Sidebar */
.sidebar {
    position: fixed;
    left: 0;
    top: var(--header-height);
    width: var(--sidebar-width);
    height: calc(100vh - var(--header-height));
    background: var(--surface-color);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    transition: var(--transition);
    z-index: 900;
    overflow-y: auto;
}

.sidebar.collapsed {
    transform: translateX(-100%);
}

.sidebar-header {
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
}

.sidebar-header h2 {
    font-size: 1.25rem;
    color: var(--text-primary);
}

.sidebar-nav {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-md);
}

.sidebar-footer {
    padding: var(--spacing-lg);
    border-top: 1px solid var(--border-color);
}

/* Main Content */
.main-content {
    flex: 1;
    margin-left: var(--sidebar-width);
    padding: var(--spacing-xl);
    max-width: 1200px;
    transition: var(--transition);
}

.sidebar.collapsed ~ .main-content {
    margin-left: 0;
}

/* Welcome Screen */
.welcome-screen {
    max-width: 900px;
    margin: 0 auto;
    padding: var(--spacing-xl) 0;
}

.welcome-content {
    text-align: center;
}

.welcome-content h1 {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xl);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    margin: var(--spacing-xl) 0;
}

.feature-card {
    background: var(--surface-color);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius-lg);
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    transition: var(--transition);
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 4px 16px rgba(102, 126, 234, 0.2);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
}

.feature-card h3 {
    font-size: 1.125rem;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.feature-card p {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

/* SuperQuiz Button - Destacado */
#btn-superquiz {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white !important;
    border: 2px solid var(--primary-color);
    position: relative;
}

#btn-superquiz h3 {
    color: white;
    font-size: 1.25rem;
}

#btn-superquiz p {
    color: rgba(255, 255, 255, 0.9);
}

#btn-superquiz::before {
    content: '✨';
    position: absolute;
    top: -10px;
    right: -10px;
    font-size: 1.5rem;
}

/* Content Area */
.content-area {
    background: var(--surface-color);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-xl);
    padding-top: calc(var(--spacing-xl) + 20px);
    box-shadow: 0 2px 8px rgba(0,0,0,0.05);
    margin-top: var(--spacing-md);
}

/* Glossary Panel */
.glossary-panel {
    position: fixed;
    right: -400px;
    top: var(--header-height);
    width: 400px;
    height: calc(100vh - var(--header-height));
    background: var(--surface-color);
    border-left: 1px solid var(--border-color);
    box-shadow: -2px 0 8px rgba(0,0,0,0.1);
    transition: var(--transition);
    z-index: 950;
    display: flex;
    flex-direction: column;
}

.glossary-panel.open {
    right: 0;
}

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

.glossary-search {
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--border-color);
}

.glossary-search input {
    width: 100%;
    padding: var(--spacing-md);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    font-size: 1rem;
}

.glossary-content {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-md);
}

/* Responsive */
@media (max-width: 1024px) {
    .sidebar {
        transform: translateX(-100%);
    }
    
    .sidebar.open {
        transform: translateX(0);
    }
    
    .main-content {
        margin-left: 0;
    }
    
    .glossary-panel {
        width: 100%;
        right: -100%;
    }
}

@media (max-width: 768px) {
    .app-title {
        font-size: 1.125rem;
    }
    
    .welcome-content h1 {
        font-size: 2rem;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .main-content {
        padding: var(--spacing-md);
    }
}

@media (max-width: 480px) {
    .header-content {
        padding: 0 var(--spacing-md);
    }
    
    .welcome-content h1 {
        font-size: 1.5rem;
    }
    
    .subtitle {
        font-size: 1rem;
    }
}