/* Excel Academy - Main Stylesheet */

/* CSS Variables */
:root {
    --excel-green: #217346;
    --excel-green-light: #2d9254;
    --excel-green-dark: #1a5c38;
    --excel-green-rgb: 33, 115, 70;
    --bg-light: #F8F9FA;
    --bg-white: #FFFFFF;
    --text-primary: #212529;
    --text-secondary: #6c757d;
    --border-color: #dee2e6;
    --shadow-sm: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.075);
    --shadow: 0 0.5rem 1rem rgba(0, 0, 0, 0.15);
    --shadow-lg: 0 1rem 3rem rgba(0, 0, 0, 0.175);
    --transition-fast: 0.15s ease-in-out;
    --transition-normal: 0.3s ease-in-out;
}

/* Base Styles */
body {
    background-color: var(--bg-light);
    color: var(--text-primary);
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
}

/* Excel Green Theme */
.btn-excel {
    background-color: var(--excel-green);
    border-color: var(--excel-green);
    color: #fff;
    transition: all var(--transition-fast);
}

.btn-excel:hover,
.btn-excel:focus {
    background-color: var(--excel-green-dark);
    border-color: var(--excel-green-dark);
    color: #fff;
    box-shadow: 0 0 0 0.25rem rgba(var(--excel-green-rgb), 0.25);
}

.btn-outline-excel {
    color: var(--excel-green);
    border-color: var(--excel-green);
    background-color: transparent;
    transition: all var(--transition-fast);
}

.btn-outline-excel:hover,
.btn-outline-excel:focus {
    background-color: var(--excel-green);
    border-color: var(--excel-green);
    color: #fff;
}

.text-excel {
    color: var(--excel-green) !important;
}

.bg-excel {
    background-color: var(--excel-green) !important;
}

.border-excel {
    border-color: var(--excel-green) !important;
}

/* Link Styles */
a {
    color: var(--excel-green);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--excel-green-dark);
}

/* Card Styles */
.card {
    border: none;
    border-radius: 0.75rem;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
}

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

.card-course {
    height: 100%;
}

.card-course .card-img-top {
    border-radius: 0.75rem 0.75rem 0 0;
    height: 200px;
    object-fit: cover;
}

/* Premium Badge */
.premium-badge {
    background: linear-gradient(135deg, #ffd700 0%, #ffaa00 100%);
    color: #000;
    font-size: 0.75rem;
    font-weight: 600;
    padding: 0.25rem 0.75rem;
    border-radius: 1rem;
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
}

.premium-content-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 0.75rem;
    color: #fff;
    text-align: center;
    padding: 2rem;
}

/* Progress Bar */
.progress {
    height: 0.5rem;
    border-radius: 1rem;
    background-color: #e9ecef;
}

.progress-bar {
    background-color: var(--excel-green);
    border-radius: 1rem;
    transition: width var(--transition-normal);
}

/* Course Progress */
.course-progress {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.course-progress .progress {
    flex: 1;
}

.course-progress .progress-text {
    font-size: 0.875rem;
    color: var(--text-secondary);
    white-space: nowrap;
}

/* Hero Section */
.hero-section {
    background: linear-gradient(135deg, var(--excel-green) 0%, var(--excel-green-dark) 100%);
    color: #fff;
    padding: 4rem 0;
    position: relative;
    overflow: hidden;
}

.hero-section::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -10%;
    width: 60%;
    height: 200%;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.05'%3E%3Crect x='0' y='0' width='30' height='30'/%3E%3Crect x='30' y='30' width='30' height='30'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
    transform: rotate(15deg);
}

.hero-section .container {
    position: relative;
    z-index: 1;
}

/* Feature Cards */
.feature-card {
    text-align: center;
    padding: 2rem;
}

.feature-card .feature-icon {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--excel-green-light) 0%, var(--excel-green) 100%);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    margin: 0 auto 1.5rem;
}

/* Lesson Navigation */
.lesson-nav {
    display: flex;
    justify-content: space-between;
    padding: 1rem 0;
    border-top: 1px solid var(--border-color);
    margin-top: 2rem;
}

.lesson-nav a {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.25rem;
    border-radius: 0.5rem;
    background: var(--bg-white);
    border: 1px solid var(--border-color);
    transition: all var(--transition-fast);
}

.lesson-nav a:hover {
    border-color: var(--excel-green);
    color: var(--excel-green);
}

/* Sidebar */
.sidebar {
    position: sticky;
    top: 100px;
}

.sidebar .list-group-item {
    border: none;
    border-left: 3px solid transparent;
    padding: 0.75rem 1rem;
    transition: all var(--transition-fast);
}

.sidebar .list-group-item:hover {
    background-color: rgba(var(--excel-green-rgb), 0.1);
    border-left-color: var(--excel-green-light);
}

.sidebar .list-group-item.active {
    background-color: rgba(var(--excel-green-rgb), 0.15);
    border-left-color: var(--excel-green);
    color: var(--excel-green);
    font-weight: 600;
}

.sidebar .list-group-item.completed::after {
    content: '\F272';
    font-family: 'bootstrap-icons';
    color: var(--excel-green);
    margin-left: auto;
}

/* FAQ Accordion */
.faq-accordion .accordion-button {
    font-weight: 500;
}

.faq-accordion .accordion-button:not(.collapsed) {
    background-color: rgba(var(--excel-green-rgb), 0.1);
    color: var(--excel-green);
}

.faq-accordion .accordion-button:focus {
    box-shadow: none;
    border-color: var(--excel-green);
}

.faq-probability {
    font-size: 0.75rem;
    color: var(--text-secondary);
    background: #e9ecef;
    padding: 0.25rem 0.5rem;
    border-radius: 1rem;
}

/* Blog Card */
.blog-card .card-img-top {
    height: 180px;
    object-fit: cover;
}

.blog-card .card-body {
    display: flex;
    flex-direction: column;
}

.blog-card .card-title {
    flex: 1;
}

.blog-meta {
    font-size: 0.875rem;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 1rem;
}

/* Tags */
.tag {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background-color: rgba(var(--excel-green-rgb), 0.1);
    color: var(--excel-green);
    border-radius: 1rem;
    font-size: 0.875rem;
    transition: all var(--transition-fast);
}

.tag:hover {
    background-color: var(--excel-green);
    color: #fff;
}

/* Search Form */
.search-form {
    position: relative;
}

.search-form .form-control {
    padding-left: 2.5rem;
    border-radius: 2rem;
}

.search-form .search-icon {
    position: absolute;
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-secondary);
}

/* Responsive */
@media (max-width: 768px) {
    .hero-section {
        padding: 3rem 0;
    }
    
    .hero-section h1 {
        font-size: 2rem;
    }
    
    .feature-card {
        padding: 1.5rem;
    }
    
    .sidebar {
        position: static;
        margin-bottom: 2rem;
    }
}

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

.fade-in {
    animation: fadeIn 0.3s ease-out;
}

/* HTMX Loading States */
.htmx-request .htmx-indicator {
    display: inline-block;
}

.htmx-indicator {
    display: none;
}

/* Print Styles */
@media print {
    .navbar,
    .footer,
    .sidebar,
    .lesson-nav,
    .cookie-banner {
        display: none !important;
    }
    
    .card {
        box-shadow: none;
        border: 1px solid #ddd;
    }
}

/* Lazy Loading */
img[loading="lazy"] {
    opacity: 0;
    transition: opacity var(--transition-normal);
}

img[loading="lazy"].loaded {
    opacity: 1;
}

/* Advertisement Styles */
.ad-container {
    background: #f8f9fa;
    border: 1px solid #e9ecef;
    border-radius: 0.5rem;
    padding: 1rem;
    text-align: center;
    margin: 1.5rem 0;
}

.ad-container small {
    display: block;
    color: var(--text-secondary);
    font-size: 0.75rem;
    margin-bottom: 0.5rem;
}

.ad-banner {
    max-width: 100%;
    height: auto;
}

.ad-sidebar {
    position: sticky;
    top: 100px;
}