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

:root {
    /* Color Palette */
    --primary: #FF6B6B;
    --secondary: #4ECDC4;
    --accent: #FFD93D;
    --dark: #1a1a2e;
    --dark-secondary: #16213e;
    --light: #ffffff;
    --gray: #a8a8a8;
    --gray-light: #f5f5f5;
    --success: #4CAF50;
    --error: #f44336;
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #FF6B6B 0%, #4ECDC4 100%);
    --gradient-secondary: linear-gradient(135deg, #4ECDC4 0%, #A8E6CF 100%);
    --gradient-accent: linear-gradient(135deg, #FFD93D 0%, #FF6B6B 100%);
    --gradient-dark: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
    
    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.12);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.16);
    --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.2);
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    
    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;
    
    /* Transitions */
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

body {
    font-family: 'Poppins', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    line-height: 1.6;
    color: var(--dark);
    background: var(--light);
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* Navbar */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    z-index: 1000;
    transition: var(--transition);
}

.nav-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) 0;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-family: 'Outfit', sans-serif;
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--dark);
    cursor: pointer;
    transition: var(--transition);
}

.logo:hover {
    transform: translateY(-2px);
}

.logo svg {
    color: var(--primary);
}

.nav-links {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
}

.nav-link {
    text-decoration: none;
    color: var(--dark);
    font-weight: 500;
    position: relative;
    padding: var(--spacing-xs) 0;
    transition: var(--transition);
}

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

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

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

/* Language Dropdown */
.language-dropdown {
    position: relative;
}

.dropdown-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-xs) var(--spacing-md);
    background: var(--gray-light);
    border: none;
    border-radius: var(--radius-full);
    cursor: pointer;
    font-family: 'Poppins', sans-serif;
    font-weight: 500;
    color: var(--dark);
    transition: var(--transition);
}

.dropdown-btn:hover {
    background: #e8e8e8;
    transform: translateY(-2px);
}

.dropdown-btn .chevron {
    transition: var(--transition);
}

.dropdown-btn:hover .chevron {
    transform: rotate(180deg);
}

.dropdown-menu {
    position: absolute;
    top: calc(100% + var(--spacing-xs));
    right: 0;
    background: white;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    min-width: 180px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: var(--transition);
    overflow: hidden;
}

.dropdown-menu.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-item {
    display: block;
    padding: var(--spacing-sm) var(--spacing-md);
    color: var(--dark);
    text-decoration: none;
    transition: var(--transition);
}

.dropdown-item:hover {
    background: var(--gray-light);
    color: var(--primary);
}

/* Hero Section */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: calc(var(--spacing-xl) + 80px) 0 var(--spacing-2xl);
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 20% 50%, rgba(255, 107, 107, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(78, 205, 196, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 50% 20%, rgba(255, 217, 61, 0.08) 0%, transparent 50%);
    animation: heroFloat 20s ease-in-out infinite;
}

@keyframes heroFloat {
    0%, 100% { transform: translate(0, 0) scale(1); }
    33% { transform: translate(30px, -30px) scale(1.05); }
    66% { transform: translate(-20px, 20px) scale(0.95); }
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.hero-title {
    font-family: 'Outfit', sans-serif;
    font-size: clamp(2.5rem, 6vw, 4rem);
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
    animation: fadeInUp 0.8s ease;
}

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

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--gray);
    margin-bottom: var(--spacing-xl);
    animation: fadeInUp 0.8s ease 0.2s backwards;
}

/* Download Box */
.download-box {
    display: flex;
    gap: var(--spacing-sm);
    max-width: 700px;
    margin: 0 auto var(--spacing-lg);
    padding: var(--spacing-sm);
    background: white;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    animation: fadeInUp 0.8s ease 0.4s backwards;
}

.input-wrapper {
    flex: 1;
    position: relative;
    display: flex;
    align-items: center;
}

.input-icon {
    position: absolute;
    left: var(--spacing-md);
    color: var(--gray);
    pointer-events: none;
}

.url-input {
    width: 100%;
    padding: var(--spacing-md) var(--spacing-md) var(--spacing-md) 3.5rem;
    border: 2px solid transparent;
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-family: 'Poppins', sans-serif;
    transition: var(--transition);
    background: var(--gray-light);
}

.url-input:focus {
    outline: none;
    border-color: var(--secondary);
    background: white;
}

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

.download-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-md) var(--spacing-xl);
    background: var(--gradient-primary);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: 600;
    font-family: 'Poppins', sans-serif;
    cursor: pointer;
    transition: var(--transition);
    white-space: nowrap;
}

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

.download-btn:active {
    transform: translateY(0);
}

/* Loading State */
.loading {
    display: none;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-xl);
    animation: fadeIn 0.3s ease;
}

.spinner {
    width: 48px;
    height: 48px;
    border: 4px solid var(--gray-light);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.loading p {
    color: var(--gray);
    font-weight: 500;
}

/* Result Section */
.result-section {
    display: none;
    max-width: 700px;
    margin: 0 auto;
    padding: var(--spacing-xl);
    background: white;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
}

.video-preview {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
    padding-bottom: var(--spacing-xl);
    border-bottom: 2px solid var(--gray-light);
}

.video-preview img {
    width: 120px;
    height: 120px;
    border-radius: var(--radius-md);
    object-fit: cover;
    box-shadow: var(--shadow-md);
}

.video-info {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.video-info h3 {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-xs);
    color: var(--dark);
}

.video-info p {
    color: var(--gray);
    font-weight: 500;
}

.download-options {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.option-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-xl);
    background: var(--gradient-primary);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: 600;
    font-family: 'Poppins', sans-serif;
    cursor: pointer;
    transition: var(--transition);
}

.option-btn:hover {
    transform: translateX(4px);
    box-shadow: var(--shadow-md);
}

.option-btn.secondary {
    background: var(--gray-light);
    color: var(--dark);
}

.option-btn.secondary:hover {
    background: var(--dark);
    color: white;
}

/* Error Message */
.error-message {
    display: none;
    align-items: center;
    gap: var(--spacing-sm);
    max-width: 700px;
    margin: 0 auto;
    padding: var(--spacing-md) var(--spacing-xl);
    background: #ffebee;
    color: var(--error);
    border-radius: var(--radius-md);
    border-left: 4px solid var(--error);
    animation: shake 0.5s ease;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-10px); }
    75% { transform: translateX(10px); }
}

.error-message svg {
    flex-shrink: 0;
}

.error-message p {
    font-weight: 500;
}

/* Features Section */
.features {
    padding: var(--spacing-2xl) 0;
    background: var(--gray-light);
}

.section-title {
    font-family: 'Outfit', sans-serif;
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 800;
    text-align: center;
    margin-bottom: var(--spacing-md);
}

.section-subtitle {
    text-align: center;
    font-size: 1.125rem;
    color: var(--gray);
    margin-bottom: var(--spacing-2xl);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-xl);
}

.feature-card {
    padding: var(--spacing-xl);
    background: white;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    opacity: 0;
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
}

.feature-icon {
    width: 64px;
    height: 64px;
    margin-bottom: var(--spacing-md);
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    transition: var(--transition);
}

.feature-card:hover .feature-icon {
    transform: scale(1.1) rotate(5deg);
}

.feature-card h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    color: var(--dark);
}

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

/* How to Use Section */
.how-to-use {
    padding: var(--spacing-2xl) 0;
    background: white;
}

.steps-container {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-lg);
    max-width: 900px;
    margin: 0 auto;
    flex-wrap: wrap;
}

.step {
    flex: 1;
    min-width: 250px;
    text-align: center;
    opacity: 0;
}

.step-number {
    width: 64px;
    height: 64px;
    margin: 0 auto var(--spacing-md);
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-primary);
    color: white;
    font-size: 1.75rem;
    font-weight: 800;
    border-radius: 50%;
    box-shadow: var(--shadow-md);
}

.step-content h3 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    color: var(--dark);
}

.step-content p {
    color: var(--gray);
    line-height: 1.7;
}

.step-connector {
    width: 60px;
    height: 2px;
    background: var(--gradient-primary);
    flex-shrink: 0;
}

/* Footer */
.footer {
    background: var(--gradient-dark);
    color: white;
    padding: var(--spacing-2xl) 0 var(--spacing-lg);
}

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

.footer-section h4 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
}

.footer-section p {
    color: rgba(255, 255, 255, 0.7);
    line-height: 1.7;
    margin-bottom: var(--spacing-md);
}

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

.footer-section ul li {
    margin-bottom: var(--spacing-xs);
}

.footer-section ul li a {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    transition: var(--transition);
}

.footer-section ul li a:hover {
    color: var(--secondary);
    padding-left: var(--spacing-xs);
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-family: 'Outfit', sans-serif;
    font-size: 1.5rem;
    font-weight: 800;
    margin-bottom: var(--spacing-md);
}

.social-links {
    display: flex;
    gap: var(--spacing-md);
}

.social-links a {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.1);
    color: white;
    border-radius: 50%;
    transition: var(--transition);
}

.social-links a:hover {
    background: var(--secondary);
    transform: translateY(-4px);
}

.footer-bottom {
    padding-top: var(--spacing-lg);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    text-align: center;
}

.footer-bottom p {
    color: rgba(255, 255, 255, 0.5);
    margin-bottom: var(--spacing-xs);
}

.disclaimer {
    font-size: 0.875rem;
}

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

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-links {
        gap: var(--spacing-md);
    }

    .nav-link {
        font-size: 0.9rem;
    }

    .hero {
        min-height: auto;
        padding: calc(var(--spacing-2xl) + 80px) 0 var(--spacing-xl);
    }

    .download-box {
        flex-direction: column;
        padding: var(--spacing-md);
    }

    .url-input {
        padding: var(--spacing-md);
        text-align: center;
    }

    .input-icon {
        display: none;
    }

    .download-btn {
        width: 100%;
        justify-content: center;
    }

    .video-preview {
        flex-direction: column;
        text-align: center;
    }

    .video-preview img {
        margin: 0 auto;
    }

    .features-grid {
        grid-template-columns: 1fr;
    }

    .step-connector {
        display: none;
    }

    .steps-container {
        flex-direction: column;
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }
}

@media (max-width: 480px) {
    .logo span {
        display: none;
    }

    .nav-link {
        display: none;
    }

    .hero-title {
        font-size: 2rem;
    }

    .hero-subtitle {
        font-size: 1rem;
    }

    .section-title {
        font-size: 1.75rem;
    }
}

/* Smooth Scroll */
html {
    scroll-behavior: smooth;
}

/* Selection */
::selection {
    background: var(--primary);
    color: white;
}

::-webkit-scrollbar {
    width: 10px;
}

::-webkit-scrollbar-track {
    background: var(--gray-light);
}

::-webkit-scrollbar-thumb {
    background: var(--gradient-primary);
    border-radius: var(--radius-full);
}

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