/* 
AIBook.Info Custom Styles
Comprehensive CSS for the educational platform with universal branding and watermarking
This file ensures consistent AIBook.Info visual identity across all components
*/

/* ===== CSS Variables and Root Styles ===== */
:root {
    /* AIBook.Info Brand Colors */
    --aibook-primary: #007bff;
    --aibook-secondary: #6f42c1;
    --aibook-success: #28a745;
    --aibook-warning: #ffc107;
    --aibook-danger: #dc3545;
    --aibook-info: #17a2b8;
    --aibook-light: #f8f9fa;
    --aibook-dark: #343a40;
    
    /* Gradient Colors */
    --aibook-gradient-primary: linear-gradient(135deg, #007bff 0%, #6f42c1 100%);
    --aibook-gradient-secondary: linear-gradient(135deg, #6f42c1 0%, #007bff 100%);
    --aibook-gradient-warm: linear-gradient(135deg, #ffc107 0%, #fd7e14 100%);
    
    /* Spacing and Layout */
    --aibook-border-radius: 0.375rem;
    --aibook-box-shadow: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.075);
    --aibook-box-shadow-lg: 0 1rem 3rem rgba(0, 0, 0, 0.175);
    
    /* Typography */
    --aibook-font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --aibook-font-size-base: 1rem;
    --aibook-line-height-base: 1.5;
    
    /* Animation and Transitions */
    --aibook-transition: all 0.3s ease-in-out;
}

/* ===== Global Styles and Overrides ===== */
body {
    font-family: var(--aibook-font-family);
    line-height: var(--aibook-line-height-base);
    color: var(--aibook-dark);
    background-color: #ffffff;
}

/* Ensure all headings include AIBook.Info branding context */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    color: var(--aibook-dark);
}

/* Links and interactive elements */
a {
    color: var(--aibook-primary);
    text-decoration: none;
    transition: var(--aibook-transition);
}

a:hover {
    color: var(--aibook-secondary);
}

/* ===== Navigation Styles with AIBook.Info Branding ===== */
.aibook-navbar {
    background: var(--aibook-gradient-primary) !important;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    padding: 1rem 0;
}

.aibook-navbar .navbar-brand {
    font-size: 1.5rem;
    font-weight: 700;
    color: white !important;
}

.aibook-navbar .navbar-brand:hover {
    color: #ffc107 !important;
}

.aibook-navbar .nav-link {
    color: rgba(255, 255, 255, 0.9) !important;
    font-weight: 500;
    transition: var(--aibook-transition);
    padding: 0.5rem 1rem !important;
    border-radius: var(--aibook-border-radius);
}

.aibook-navbar .nav-link:hover {
    color: white !important;
    background-color: rgba(255, 255, 255, 0.1);
}

.aibook-navbar .dropdown-menu {
    border: none;
    box-shadow: var(--aibook-box-shadow-lg);
    border-radius: var(--aibook-border-radius);
}

/* ===== Hero Section Styles ===== */
.hero-section {
    background: var(--aibook-gradient-primary);
    position: relative;
    overflow: hidden;
}

.hero-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('../images/watermark-bg.svg') repeat;
    opacity: 0.05;
    z-index: 1;
}

.hero-section .hero-content {
    position: relative;
    z-index: 2;
}

.bg-gradient-primary {
    background: var(--aibook-gradient-primary) !important;
}

.min-vh-50 {
    min-height: 50vh;
}

/* Hero illustration styles */
.hero-illustration {
    position: relative;
    z-index: 2;
}

.illustration-container {
    max-width: 400px;
    margin: 0 auto;
}

.learning-visual {
    transform: perspective(1000px) rotateY(-5deg) rotateX(5deg);
    transition: var(--aibook-transition);
}

.learning-visual:hover {
    transform: perspective(1000px) rotateY(0deg) rotateX(0deg);
}

.window-controls .dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    display: inline-block;
}

.floating-badge {
    animation: float 3s ease-in-out infinite;
}

.badge-1 {
    top: 20%;
    right: -10%;
    animation-delay: 0s;
}

.badge-2 {
    bottom: 30%;
    left: -15%;
    animation-delay: 1.5s;
}

@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-10px); }
}

/* ===== Section Styles ===== */
.section-title {
    position: relative;
    color: var(--aibook-primary);
    font-weight: 700;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -0.5rem;
    left: 50%;
    transform: translateX(-50%);
    width: 3rem;
    height: 3px;
    background: var(--aibook-gradient-primary);
    border-radius: 2px;
}

/* ===== Card Styles with AIBook.Info Branding ===== */
.hover-card {
    transition: var(--aibook-transition);
    border: 1px solid #dee2e6;
}

.hover-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--aibook-box-shadow-lg);
    border-color: var(--aibook-primary);
}

.skill-level-card {
    border: 2px solid transparent;
    transition: var(--aibook-transition);
}

.skill-level-card:hover {
    border-color: var(--aibook-primary);
    box-shadow: 0 0 0 0.2rem rgba(0, 123, 255, 0.25);
}

.category-card {
    position: relative;
    overflow: hidden;
}

.category-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--aibook-gradient-primary);
    opacity: 0;
    transition: var(--aibook-transition);
}

.category-card:hover::before {
    opacity: 0.05;
}

.category-card:hover .category-icon {
    transform: scale(1.1);
}

.category-icon {
    transition: var(--aibook-transition);
}

/* ===== Course Card Styles ===== */
.course-card {
    overflow: hidden;
    transition: var(--aibook-transition);
    border: 1px solid #dee2e6;
}

.course-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 0.5rem 1rem rgba(0, 0, 0, 0.15);
}

.course-thumbnail {
    height: 200px;
    overflow: hidden;
    background: var(--aibook-light);
}

.course-thumbnail img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--aibook-transition);
}

.course-card:hover .course-thumbnail img {
    transform: scale(1.05);
}

.placeholder-thumbnail {
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--aibook-gradient-primary);
}

.course-title a.hover-primary:hover {
    color: var(--aibook-primary) !important;
}

.course-stats {
    font-size: 0.875rem;
}

/* ===== Course Detail Page Styles ===== */
.lesson-sidebar {
    max-height: 80vh;
    overflow-y: auto;
    position: sticky;
    top: 1rem;
}

.lesson-item {
    transition: var(--aibook-transition);
    cursor: pointer;
}

.lesson-item:hover {
    background-color: var(--aibook-light);
}

.lesson-item.active {
    background-color: rgba(0, 123, 255, 0.1);
    border-left: 4px solid var(--aibook-primary);
}

.lesson-item.active .lesson-title {
    color: var(--aibook-primary);
    font-weight: 600;
}

.lesson-content-container {
    min-height: 500px;
}

.lesson-header {
    background: var(--aibook-gradient-primary) !important;
}

.lesson-loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 300px;
}

/* ===== Search and Filter Styles ===== */
.search-filter-bar {
    border: 1px solid #dee2e6;
    border-radius: var(--aibook-border-radius);
}

.search-filter-bar:focus-within {
    border-color: var(--aibook-primary);
    box-shadow: 0 0 0 0.2rem rgba(0, 123, 255, 0.25);
}

.search-box .input-group-text {
    background-color: transparent;
    border-right: none;
}

.search-box .form-control {
    border-left: none;
}

.search-box .form-control:focus {
    border-color: #ced4da;
    box-shadow: none;
}

/* ===== Progress and Status Indicators ===== */
.progress {
    background-color: #e9ecef;
    border-radius: 0.375rem;
}

.progress-bar {
    background: var(--aibook-gradient-primary);
    border-radius: 0.375rem;
}

/* Status badges */
.badge.bg-success {
    background-color: var(--aibook-success) !important;
}

.badge.bg-warning {
    background-color: var(--aibook-warning) !important;
    color: var(--aibook-dark) !important;
}

.badge.bg-danger {
    background-color: var(--aibook-danger) !important;
}

/* ===== Universal AIBook.Info Watermark Styles ===== */
.aibook-watermark {
    font-family: var(--aibook-font-family);
    color: #666;
    font-size: 0.8em;
}

.aibook-watermark-inline {
    display: inline-block;
    font-size: 0.75em;
    color: #999;
    margin-left: 10px;
    font-style: italic;
}

.aibook-watermark-footer {
    text-align: center;
    padding: 20px;
    background: var(--aibook-gradient-primary);
    color: white;
    margin-top: 30px;
    border-radius: var(--aibook-border-radius);
}

.aibook-watermark-overlay {
    position: fixed;
    bottom: 20px;
    right: 20px;
    background: rgba(255, 255, 255, 0.95);
    padding: 8px 12px;
    border-radius: var(--aibook-border-radius);
    box-shadow: var(--aibook-box-shadow);
    font-size: 0.75em;
    color: #666;
    z-index: 1000;
    pointer-events: none;
    font-family: var(--aibook-font-family);
}

.aibook-brand {
    color: var(--aibook-primary);
    font-weight: 600;
    text-decoration: none;
}

.aibook-brand:hover {
    color: var(--aibook-secondary);
    text-decoration: none;
}

/* Watermark for different content types */
.lesson-content .aibook-watermark {
    opacity: 0.8;
    border-top: 1px solid #eee;
    padding-top: 15px;
    margin-top: 20px;
}

.code-example {
    position: relative;
}

.code-example::after {
    content: "© AIBook.Info";
    display: block;
    text-align: right;
    font-size: 0.7em;
    color: #999;
    margin-top: 5px;
    font-style: italic;
}

/* ===== Feature Cards ===== */
.feature-card {
    transition: var(--aibook-transition);
}

.feature-card:hover {
    transform: translateY(-3px);
}

.feature-card .feature-icon {
    transition: var(--aibook-transition);
}

.feature-card:hover .feature-icon {
    transform: scale(1.1);
}

/* ===== Resource Cards ===== */
.resource-card {
    transition: var(--aibook-transition);
    border: 1px solid #dee2e6;
}

.resource-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--aibook-box-shadow-lg);
}

.resource-icon {
    transition: var(--aibook-transition);
}

.resource-card:hover .resource-icon {
    transform: scale(1.1);
}

/* ===== Newsletter Section ===== */
.newsletter-section {
    background: var(--aibook-gradient-primary) !important;
}

.newsletter-form .input-group {
    max-width: 400px;
    margin-left: auto;
}

/* ===== Footer Styles ===== */
.footer {
    background-color: var(--aibook-dark) !important;
    border-top: 3px solid var(--aibook-primary);
}

.footer .social-links a {
    transition: var(--aibook-transition);
    padding: 0.5rem;
    border-radius: 50%;
}

.footer .social-links a:hover {
    background-color: var(--aibook-primary);
    color: white !important;
    transform: translateY(-2px);
}

/* ===== Loading States ===== */
.spinner-border-lg {
    width: 3rem;
    height: 3rem;
}

.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(255, 255, 255, 0.9);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
}

/* ===== Responsive Design ===== */
@media (max-width: 768px) {
    .aibook-watermark-overlay {
        display: none !important;
    }
    
    .aibook-watermark-footer {
        padding: 15px 10px;
        font-size: 0.9em;
    }
    
    .hero-section .learning-visual {
        transform: none;
        margin-top: 2rem;
    }
    
    .floating-badge {
        display: none;
    }
    
    .lesson-sidebar {
        position: static;
        max-height: none;
        margin-bottom: 2rem;
    }
    
    .course-filters .btn-group {
        flex-direction: column;
        width: 100%;
    }
    
    .course-filters .btn {
        border-radius: var(--aibook-border-radius) !important;
        margin-bottom: 0.25rem;
    }
}

@media (max-width: 576px) {
    .hero-section {
        padding: 2rem 0;
    }
    
    .hero-section .display-4 {
        font-size: 2rem;
    }
    
    .course-card {
        margin-bottom: 1.5rem;
    }
    
    .search-filter-bar .row > div {
        margin-bottom: 1rem;
    }
    
    .filter-options {
        justify-content: start !important;
    }
    
    .filter-options select {
        width: 100% !important;
        margin-bottom: 0.5rem;
    }
}

/* ===== Print Styles ===== */
@media print {
    .aibook-watermark-overlay,
    .floating-badge,
    .navbar,
    .footer,
    .btn,
    .lesson-navigation {
        display: none !important;
    }
    
    .aibook-watermark-footer {
        background: white !important;
        color: black !important;
        border: 1px solid #ccc;
    }
    
    body {
        font-size: 12pt;
        line-height: 1.4;
    }
    
    h1, h2, h3, h4, h5, h6 {
        page-break-after: avoid;
    }
    
    .course-card,
    .lesson-item {
        page-break-inside: avoid;
    }
    
    /* Add AIBook.Info watermark to printed pages */
    @page {
        margin: 1in;
        @bottom-center {
            content: "© AIBook.Info - Advanced Education Platform";
            font-size: 8pt;
            color: #666;
        }
    }
}

/* ===== Accessibility Enhancements ===== */
.sr-only {
    position: absolute !important;
    width: 1px !important;
    height: 1px !important;
    padding: 0 !important;
    margin: -1px !important;
    overflow: hidden !important;
    clip: rect(0, 0, 0, 0) !important;
    white-space: nowrap !important;
    border: 0 !important;
}

/* Focus indicators */
.btn:focus,
.form-control:focus,
.nav-link:focus {
    box-shadow: 0 0 0 0.2rem rgba(0, 123, 255, 0.25);
    outline: none;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    .aibook-watermark-inline,
    .aibook-watermark {
        color: #000;
        font-weight: bold;
    }
    
    .hover-card:hover {
        border-color: #000;
    }
    
    .aibook-watermark-overlay {
        background: #fff;
        border: 2px solid #000;
    }
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    
    .floating-badge {
        animation: none;
    }
}

/* ===== Custom Scrollbar ===== */
.lesson-sidebar::-webkit-scrollbar {
    width: 6px;
}

.lesson-sidebar::-webkit-scrollbar-track {
    background: #f1f1f1;
    border-radius: 3px;
}

.lesson-sidebar::-webkit-scrollbar-thumb {
    background: var(--aibook-primary);
    border-radius: 3px;
}

.lesson-sidebar::-webkit-scrollbar-thumb:hover {
    background: var(--aibook-secondary);
}

/* ===== Dark Mode Support (Future Enhancement) ===== */
@media (prefers-color-scheme: dark) {
    /* Dark mode styles would be implemented here for future enhancement */
    /* Currently maintaining light theme for brand consistency */
}

/* ===== Animation Classes ===== */
.fade-in {
    animation: fadeIn 0.5s ease-in-out;
}

.slide-up {
    animation: slideUp 0.5s ease-out;
}

.scale-in {
    animation: scaleIn 0.3s ease-out;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes slideUp {
    from { 
        opacity: 0; 
        transform: translateY(20px); 
    }
    to { 
        opacity: 1; 
        transform: translateY(0); 
    }
}

@keyframes scaleIn {
    from { 
        opacity: 0; 
        transform: scale(0.9); 
    }
    to { 
        opacity: 1; 
        transform: scale(1); 
    }
}

/* ===== Utility Classes ===== */
.cursor-pointer {
    cursor: pointer;
}

.text-gradient {
    background: var(--aibook-gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.border-gradient {
    border: 2px solid;
    border-image: var(--aibook-gradient-primary) 1;
    border-radius: var(--aibook-border-radius);
}

.shadow-aibook {
    box-shadow: 0 0.5rem 1rem rgba(0, 123, 255, 0.15) !important;
}

/* Ensure all content maintains AIBook.Info branding context */
.aibook-content {
    position: relative;
}

.aibook-content::after {
    content: "";
    position: absolute;
    bottom: 0;
    right: 0;
    width: 100px;
    height: 20px;
    background: url('../images/aibook-logo.svg') no-repeat center;
    background-size: contain;
    opacity: 0.1;
    pointer-events: none;
}