/**
 * Social Media Video Downloader - Main Stylesheet
 * 
 * @author Dr. Atef Ahmed
 * @version 1.0
 */

:root {
    --primary-color: #4361ee;
    --secondary-color: #3f37c9;
    --success-color: #4cc9f0;
    --light-color: #f8f9fa;
    --dark-color: #212529;
    --gray-color: #6c757d;
    --border-radius: 0.5rem;
    --box-shadow: 0 0.5rem 1rem rgba(0, 0, 0, 0.15);
    --transition: all 0.3s ease;
}

/* Base Styles */
body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--dark-color);
    background-color: #fff;
    transition: var(--transition);
}

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

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

/* Dark Mode */
body.dark-mode {
    background-color: #121212;
    color: #f8f9fa;
}

body.dark-mode .navbar {
    background-color: #1e1e1e !important;
}

body.dark-mode .navbar-light .navbar-brand,
body.dark-mode .navbar-light .navbar-nav .nav-link {
    color: #f8f9fa;
}

body.dark-mode .bg-light {
    background-color: #1e1e1e !important;
}

body.dark-mode .card {
    background-color: #2d2d2d;
    color: #f8f9fa;
}

body.dark-mode .text-muted {
    color: #adb5bd !important;
}

body.dark-mode .form-control,
body.dark-mode .form-select {
    background-color: #333;
    border-color: #444;
    color: #f8f9fa;
}

body.dark-mode .accordion-button {
    background-color: #2d2d2d;
    color: #f8f9fa;
}

body.dark-mode .accordion-button:not(.collapsed) {
    background-color: #3d3d3d;
    color: #f8f9fa;
}

body.dark-mode .accordion-body {
    background-color: #2d2d2d;
    color: #f8f9fa;
}

/* Header Styles */
.navbar {
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    transition: var(--transition);
}

.navbar-brand img {
    border-radius: 50%;
}

/* Hero Section */
.hero-section {
    padding: 5rem 0;
    background: linear-gradient(135deg, #4cc9f0 0%, #4361ee 100%);
    color: white;
}

.hero-section h1 {
    font-weight: 700;
    margin-bottom: 1.5rem;
}

.hero-section .lead {
    font-size: 1.25rem;
    margin-bottom: 2rem;
}

/* URL Input Form */
#downloadForm .input-group {
    box-shadow: var(--box-shadow);
    border-radius: var(--border-radius);
    overflow: hidden;
}

#videoUrl {
    border: none;
    padding: 1rem 1.5rem;
    font-size: 1.1rem;
}

#downloadForm .btn {
    padding: 0 1.5rem;
}

/* Video Preview Section */
.video-preview .card {
    border: none;
    border-radius: var(--border-radius);
    overflow: hidden;
    transition: var(--transition);
}

.video-preview .card:hover {
    transform: translateY(-5px);
    box-shadow: var(--box-shadow);
}

.video-preview img {
    width: 100%;
    height: auto;
    object-fit: cover;
}

/* Platform Cards */
.platform-card {
    border: none;
    border-radius: var(--border-radius);
    transition: var(--transition);
    text-align: center;
}

.platform-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--box-shadow);
}

.platform-card i {
    color: var(--primary-color);
}

/* How It Works Section */
.step-circle {
    width: 60px;
    height: 60px;
    background-color: var(--primary-color);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: bold;
    margin: 0 auto;
}

/* Testimonials */
.testimonial-card {
    background-color: white;
    border-radius: var(--border-radius);
    padding: 2rem;
    margin: 1rem;
    box-shadow: var(--box-shadow);
    text-align: center;
}

body.dark-mode .testimonial-card {
    background-color: #2d2d2d;
}

.testimonial-text {
    font-style: italic;
    font-size: 1.1rem;
    margin-bottom: 1.5rem;
}

.testimonial-author {
    display: flex;
    align-items: center;
    justify-content: center;
}

.testimonial-avatar {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    margin-right: 1rem;
    object-fit: cover;
}

/* Feature List */
.feature-list {
    list-style: none;
    padding-left: 0;
}

.feature-list li {
    margin-bottom: 0.75rem;
    font-size: 1.1rem;
}

/* FAQ Section */
.accordion-button:focus {
    box-shadow: none;
    border-color: rgba(0, 0, 0, 0.125);
}

.accordion-button:not(.collapsed) {
    background-color: rgba(67, 97, 238, 0.1);
    color: var(--primary-color);
}

/* Footer */
footer {
    background-color: var(--dark-color);
}

.social-icons a {
    display: inline-block;
    margin-right: 0.5rem;
    margin-bottom: 0.5rem;
    transition: var(--transition);
}

.social-icons a:hover {
    transform: translateY(-3px);
    opacity: 0.8;
}

/* Responsive Adjustments */
@media (max-width: 768px) {
    .hero-section {
        padding: 3rem 0;
    }
    
    .hero-section h1 {
        font-size: 2rem;
    }
    
    .testimonial-card {
        padding: 1.5rem;
    }
}

/* Animation Effects */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.fade-in {
    animation: fadeIn 0.5s ease-in;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 10px;
}

::-webkit-scrollbar-track {
    background: #f1f1f1;
}

::-webkit-scrollbar-thumb {
    background: var(--primary-color);
    border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--secondary-color);
}

body.dark-mode ::-webkit-scrollbar-track {
    background: #333;
}

/* Download History */
.download-history-item {
    border-left: 3px solid var(--primary-color);
    padding-left: 1rem;
    margin-bottom: 1rem;
}

/* Premium Badge */
.premium-badge {
    background-color: #ffd700;
    color: #000;
    font-size: 0.75rem;
    padding: 0.25rem 0.5rem;
    border-radius: 1rem;
    margin-left: 0.5rem;
    font-weight: bold;
}

/* Loading Spinner */
.spinner-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 9999;
}

.spinner-container {
    background-color: white;
    padding: 2rem;
    border-radius: var(--border-radius);
    text-align: center;
    box-shadow: var(--box-shadow);
}

body.dark-mode .spinner-container {
    background-color: #2d2d2d;
}

.spinner {
    width: 3rem;
    height: 3rem;
    margin-bottom: 1rem;
}