* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.container {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-radius: 20px;
    padding: 40px;
    max-width: 600px;
    width: 100%;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
    animation: fadeInUp 0.6s ease-out;
}

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

.hero {
    text-align: center;
    margin-bottom: 40px;
}

.hero h1 {
    font-size: 2.5rem;
    font-weight: 700;
    color: #2d3748;
    margin-bottom: 10px;
    background: linear-gradient(135deg, #667eea, #764ba2);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero p {
    font-size: 1.1rem;
    color: #718096;
    font-weight: 400;
}

.input-section {
    margin-bottom: 40px;
}

.url-input-wrapper {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

#urlInput {
    flex: 1;
    min-width: 300px;
    padding: 16px 20px;
    border: 2px solid #e2e8f0;
    border-radius: 12px;
    font-size: 1rem;
    transition: all 0.3s ease;
    background: white;
}

#urlInput:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
    transform: translateY(-1px);
}

.download-btn {
    padding: 16px 32px;
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
    border: none;
    border-radius: 12px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
    min-width: 160px;
}

.download-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(102, 126, 234, 0.3);
}

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

.download-btn.loading {
    pointer-events: none;
}

.download-btn.loading .btn-text {
    opacity: 0;
}

.spinner {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 20px;
    height: 20px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top: 2px solid white;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    opacity: 0;
}

.download-btn.loading .spinner {
    opacity: 1;
}

@keyframes spin {
    0% { transform: translate(-50%, -50%) rotate(0deg); }
    100% { transform: translate(-50%, -50%) rotate(360deg); }
}

.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 30px;
    margin-bottom: 30px;
}

.feature {
    text-align: center;
    padding: 20px;
    border-radius: 12px;
    background: rgba(255, 255, 255, 0.5);
    transition: all 0.3s ease;
}

.feature:hover {
    transform: translateY(-5px);
    background: rgba(255, 255, 255, 0.8);
}

.feature-icon {
    font-size: 2rem;
    margin-bottom: 10px;
}

.feature h3 {
    font-size: 1.1rem;
    font-weight: 600;
    color: #2d3748;
    margin-bottom: 8px;
}

.feature p {
    font-size: 0.9rem;
    color: #718096;
}

.error-message, .success-message {
    padding: 16px;
    border-radius: 12px;
    margin-top: 20px;
    font-weight: 500;
    display: none;
    animation: slideIn 0.3s ease-out;
}

.error-message {
    background: #fed7d7;
    color: #c53030;
    border: 1px solid #feb2b2;
}

.success-message {
    background: #c6f6d5;
    color: #2f855a;
    border: 1px solid #9ae6b4;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@media (max-width: 768px) {
    .container {
        padding: 30px 20px;
        margin: 10px;
    }
    
    .hero h1 {
        font-size: 2rem;
    }
    
    .url-input-wrapper {
        flex-direction: column;
    }
    
    #urlInput {
        min-width: unset;
    }
    
    .features {
        grid-template-columns: 1fr;
        gap: 20px;
    }
}