/* YTMax Pro - Advanced YouTube Downloader CSS */

/* CSS Variables for Theme Management */
:root {
    /* Primary Colors */
    --primary-color: #ff4757;
    --primary-gradient: linear-gradient(135deg, #ff4757 0%, #ff3742 50%, #ff1744 100%);
    --secondary-color: #2f3640;
    --accent-color: #00d4aa;
    
    /* Background Colors */
    --bg-primary: #0a0e1a;
    --bg-secondary: #1a1f2e;
    --bg-tertiary: #252b3d;
    --bg-card: rgba(42, 48, 66, 0.8);
    --bg-glass: rgba(255, 255, 255, 0.05);
    
    /* Text Colors */
    --text-primary: #ffffff;
    --text-secondary: #b8c5d1;
    --text-muted: #7a8394;
    
    /* Border & Shadow */
    --border-color: rgba(255, 255, 255, 0.1);
    --shadow-light: 0 4px 20px rgba(0, 0, 0, 0.1);
    --shadow-medium: 0 8px 32px rgba(0, 0, 0, 0.2);
    --shadow-heavy: 0 16px 64px rgba(0, 0, 0, 0.3);
    
    /* Spacing */
    --container-max-width: 1200px;
    --section-padding: 80px 0;
    --card-padding: 32px;
    
    /* Border Radius */
    --border-radius-sm: 8px;
    --border-radius-md: 16px;
    --border-radius-lg: 24px;
    --border-radius-xl: 32px;
    
    /* Transitions */
    --transition-fast: 0.2s ease-in-out;
    --transition-normal: 0.3s ease-in-out;
    --transition-slow: 0.5s ease-in-out;
}

/* Reset & Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

/* Background Animation */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(circle at 20% 80%, rgba(255, 71, 87, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(0, 212, 170, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 40% 40%, rgba(255, 71, 87, 0.05) 0%, transparent 50%);
    z-index: -1;
    animation: float 20s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0px) rotate(0deg); }
    50% { transform: translateY(-20px) rotate(1deg); }
}

/* Container */
.container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 20px;
}

/* Header & Navigation */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: rgba(10, 14, 26, 0.95);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
}

.navbar {
    padding: 16px 0;
}

.nav-container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 24px;
    font-weight: 800;
    color: var(--text-primary);
    text-decoration: none;
}

.brand-icon {
    color: var(--primary-color);
    font-size: 28px;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 32px;
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    position: relative;
    transition: var(--transition-normal);
}

.nav-link:hover,
.nav-link.active {
    color: var(--primary-color);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-gradient);
    transition: var(--transition-normal);
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}

.nav-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 20px;
    cursor: pointer;
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    padding: 120px 0 80px;
}

.hero-container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 20px;
    text-align: center;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: var(--bg-glass);
    border: 1px solid var(--border-color);
    padding: 8px 16px;
    border-radius: 50px;
    font-size: 14px;
    color: var(--accent-color);
    margin-bottom: 24px;
    backdrop-filter: blur(10px);
}

.hero-title {
    font-size: clamp(2.5rem, 6vw, 4rem);
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 24px;
    background: linear-gradient(135deg, var(--text-primary) 0%, var(--text-secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.gradient-text {
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    display: block;
    animation: gradientShift 3s ease-in-out infinite;
}

@keyframes gradientShift {
    0%, 100% { filter: hue-rotate(0deg); }
    50% { filter: hue-rotate(20deg); }
}

.hero-description {
    font-size: 18px;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto 48px;
    line-height: 1.7;
}

/* Download Form */
.download-form {
    max-width: 600px;
    margin: 0 auto 40px;
    position: relative;
}

.input-container {
    position: relative;
    display: flex;
    background: var(--bg-card);
    border: 2px solid transparent;
    border-radius: var(--border-radius-md);
    overflow: hidden;
    backdrop-filter: blur(20px);
    transition: var(--transition-normal);
}

.input-container:focus-within {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 4px rgba(255, 71, 87, 0.1);
}

.url-input {
    flex: 1;
    background: none;
    border: none;
    padding: 20px 24px;
    color: var(--text-primary);
    font-size: 16px;
    outline: none;
}

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

.input-actions {
    display: flex;
    align-items: center;
    padding: 12px;
    gap: 8px;
}

.action-btn {
    background: var(--bg-glass);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 8px;
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    transition: var(--transition-fast);
}

.action-btn:hover {
    background: var(--primary-color);
    color: white;
    transform: scale(1.05);
}

.download-btn {
    background: var(--primary-gradient);
    border: none;
    color: white;
    padding: 20px 40px;
    border-radius: var(--border-radius-md);
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 12px;
    margin-top: 16px;
    width: 100%;
    justify-content: center;
    position: relative;
    overflow: hidden;
    transition: var(--transition-normal);
}

.download-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: var(--transition-slow);
}

.download-btn:hover::before {
    left: 100%;
}

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

/* Quick Actions */
.quick-actions {
    display: flex;
    justify-content: center;
    gap: 16px;
    margin-bottom: 48px;
    flex-wrap: wrap;
}

.quick-btn {
    background: var(--bg-glass);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 12px 20px;
    border-radius: var(--border-radius-md);
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    font-weight: 500;
    backdrop-filter: blur(10px);
    transition: var(--transition-normal);
}

.quick-btn:hover {
    background: var(--primary-color);
    color: white;
    transform: translateY(-2px);
    box-shadow: var(--shadow-light);
}

/* Stats */
.stats {
    display: flex;
    justify-content: center;
    gap: 48px;
    flex-wrap: wrap;
}

.stat-item {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 2rem;
    font-weight: 800;
    color: var(--primary-color);
    margin-bottom: 4px;
}

.stat-label {
    color: var(--text-muted);
    font-size: 14px;
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(10px);
    z-index: 2000;
    animation: fadeIn var(--transition-normal);
}

.modal.show {
    display: flex;
    align-items: center;
    justify-content: center;
}

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

.modal-content {
    background: var(--bg-secondary);
    border-radius: var(--border-radius-lg);
    border: 1px solid var(--border-color);
    max-width: 800px;
    width: 90%;
    max-height: 80vh;
    overflow-y: auto;
    position: relative;
    animation: slideUp var(--transition-normal);
}

@keyframes slideUp {
    from { 
        opacity: 0;
        transform: translateY(50px) scale(0.95);
    }
    to { 
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 24px 32px;
    border-bottom: 1px solid var(--border-color);
}

.modal-header h3 {
    font-size: 24px;
    font-weight: 700;
}

.modal-close {
    background: var(--bg-glass);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 8px;
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    transition: var(--transition-fast);
}

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

.modal-body {
    padding: 32px;
}

/* Loading State */
.loading-container {
    text-align: center;
    padding: 48px 0;
}

.loading-spinner {
    width: 48px;
    height: 48px;
    border: 4px solid var(--border-color);
    border-top: 4px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 24px;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Video Info */
.video-info {
    display: flex;
    gap: 24px;
    margin-bottom: 32px;
    padding: 24px;
    background: var(--bg-glass);
    border-radius: var(--border-radius-md);
    border: 1px solid var(--border-color);
}

.video-thumbnail {
    position: relative;
    flex-shrink: 0;
}

.video-thumbnail img {
    width: 200px;
    height: 112px;
    object-fit: cover;
    border-radius: var(--border-radius-sm);
}

.video-duration {
    position: absolute;
    bottom: 8px;
    right: 8px;
    background: rgba(0, 0, 0, 0.8);
    color: white;
    padding: 4px 8px;
    border-radius: 4px;
    font-size: 12px;
    font-weight: 600;
}

.video-details h4 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 8px;
    line-height: 1.4;
}

.video-meta {
    color: var(--text-muted);
    font-size: 14px;
}

/* Download Options */
.download-options h4 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 24px;
}

.format-section {
    margin-bottom: 32px;
}

.format-section h5 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--text-secondary);
}

.format-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 16px;
}

.format-btn {
    background: var(--bg-glass);
    border: 2px solid var(--border-color);
    color: var(--text-primary);
    padding: 20px;
    border-radius: var(--border-radius-md);
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 16px;
    transition: var(--transition-normal);
    backdrop-filter: blur(10px);
}

.format-btn:hover {
    border-color: var(--primary-color);
    background: rgba(255, 71, 87, 0.1);
    transform: translateY(-2px);
}

.format-btn.selected {
    border-color: var(--primary-color);
    background: rgba(255, 71, 87, 0.2);
}

.format-btn i {
    font-size: 24px;
    color: var(--primary-color);
}

.format-btn div span {
    display: block;
    font-weight: 600;
    margin-bottom: 4px;
}

.format-btn div small {
    color: var(--text-muted);
    font-size: 12px;
}

.download-actions {
    margin-top: 32px;
    text-align: center;
}

.download-selected-btn {
    background: var(--primary-gradient);
    border: none;
    color: white;
    padding: 16px 32px;
    border-radius: var(--border-radius-md);
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 12px;
    transition: var(--transition-normal);
}

.download-selected-btn:hover:not(.disabled) {
    transform: translateY(-2px);
    box-shadow: var(--shadow-medium);
}

.download-selected-btn.disabled {
    background: var(--bg-tertiary);
    color: var(--text-muted);
    cursor: not-allowed;
}

/* Features Section */
.features {
    padding: var(--section-padding);
    position: relative;
}

.section-header {
    text-align: center;
    margin-bottom: 64px;
}

.section-title {
    font-size: 3rem;
    font-weight: 800;
    margin-bottom: 16px;
    background: linear-gradient(135deg, var(--text-primary) 0%, var(--text-secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-description {
    font-size: 18px;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 32px;
}

.feature-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    padding: var(--card-padding);
    text-align: center;
    backdrop-filter: blur(20px);
    transition: var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 2px;
    background: var(--primary-gradient);
    transition: var(--transition-slow);
}

.feature-card:hover::before {
    left: 0;
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-heavy);
    border-color: var(--primary-color);
}

.feature-icon {
    width: 80px;
    height: 80px;
    background: var(--primary-gradient);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 24px;
    font-size: 32px;
    color: white;
}

.feature-card h3 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 16px;
}

.feature-card p {
    color: var(--text-secondary);
    line-height: 1.7;
}

/* How To Use Section */
.how-to {
    padding: var(--section-padding);
    background: var(--bg-secondary);
}

.steps-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 48px;
    margin-top: 64px;
}

.step {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    position: relative;
}

.step-number {
    width: 60px;
    height: 60px;
    background: var(--primary-gradient);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    font-weight: 800;
    margin-bottom: 24px;
    position: relative;
    z-index: 2;
}

.step-content h3 {
    font-size: 24px;
    font-weight: 600;
    margin-bottom: 16px;
}

.step-content p {
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 24px;
}

.step-icon {
    font-size: 48px;
    color: var(--accent-color);
    opacity: 0.3;
}

/* About Section */
.about {
    padding: var(--section-padding);
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 64px;
    align-items: center;
}

.about-text h2 {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 24px;
}

.about-text p {
    font-size: 18px;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 32px;
}

.about-features {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.about-feature {
    display: flex;
    align-items: center;
    gap: 16px;
    font-weight: 500;
}

.about-feature i {
    color: var(--accent-color);
    font-size: 20px;
    width: 24px;
}

.about-visual {
    display: flex;
    align-items: center;
    justify-content: center;
}

.visual-element {
    width: 200px;
    height: 200px;
    background: var(--primary-gradient);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 80px;
    color: white;
    animation: float 6s ease-in-out infinite;
}

/* Footer */
.footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: 48px 0 24px;
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 48px;
    margin-bottom: 32px;
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 24px;
    font-weight: 800;
    color: var(--text-primary);
    margin-bottom: 16px;
}

.footer-brand i {
    color: var(--primary-color);
}

.footer-section h4 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 16px;
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: 8px;
}

.footer-section ul li a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: var(--transition-fast);
}

.footer-section ul li a:hover {
    color: var(--primary-color);
}

.footer-bottom {
    text-align: center;
    padding-top: 24px;
    border-top: 1px solid var(--border-color);
    color: var(--text-muted);
}

/* Utility Classes */
.hidden {
    display: none !important;
}

.disabled {
    opacity: 0.5;
    pointer-events: none;
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-menu {
        display: none;
    }
    
    .nav-toggle {
        display: block;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .about-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .stats {
        gap: 24px;
    }
    
    .quick-actions {
        gap: 8px;
    }
    
    .quick-btn {
        padding: 8px 16px;
        font-size: 12px;
    }
    
    .video-info {
        flex-direction: column;
        text-align: center;
    }
    
    .format-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }
    
    .nav-container {
        padding: 0 16px;
    }
    
    .hero {
        padding: 100px 0 60px;
    }
    
    .hero-description {
        font-size: 16px;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .modal-content {
        width: 95%;
        margin: 20px;
    }
    
    .modal-header,
    .modal-body {
        padding: 20px;
    }
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Print Styles */
@media print {
    .header,
    .nav-toggle,
    .modal {
        display: none !important;
    }
    
    body {
        background: white !important;
        color: black !important;
    }
}