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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: #0a0a0a;
    color: #ffffff;
    line-height: 1.6;
    min-height: 100vh;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 2rem;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

header {
    text-align: center;
    margin-bottom: 3rem;
}

header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

header p {
    color: #888;
    font-size: 1.1rem;
}

main {
    flex: 1;
}

.download-section {
    background: #1a1a1a;
    border-radius: 12px;
    padding: 2rem;
    margin-bottom: 2rem;
    border: 1px solid #333;
}

.input-group {
    display: flex;
    gap: 1rem;
    margin-bottom: 1rem;
}

#videoUrl {
    flex: 1;
    padding: 1rem;
    border: 2px solid #333;
    border-radius: 8px;
    background: #2a2a2a;
    color: #fff;
    font-size: 1rem;
    transition: border-color 0.3s ease;
}

#videoUrl:focus {
    outline: none;
    border-color: #667eea;
}

#videoUrl::placeholder {
    color: #666;
}

#downloadBtn {
    padding: 1rem 2rem;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    min-width: 120px;
    display: flex;
    align-items: center;
    justify-content: center;
}

#downloadBtn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(102, 126, 234, 0.3);
}

#downloadBtn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

.loader {
    width: 20px;
    height: 20px;
    border: 2px solid #ffffff33;
    border-top: 2px solid #ffffff;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

.result {
    background: #1a4d3a;
    border: 1px solid #2d7a4d;
    border-radius: 8px;
    padding: 1rem;
    margin-top: 1rem;
}

.result a {
    color: #4ade80;
    text-decoration: none;
    font-weight: 600;
}

.result a:hover {
    text-decoration: underline;
}

.error {
    background: #4d1a1a;
    border: 1px solid #7a2d2d;
    border-radius: 8px;
    padding: 1rem;
    margin-top: 1rem;
    color: #ff6b6b;
}

.info-section {
    background: #1a1a1a;
    border-radius: 12px;
    padding: 2rem;
    border: 1px solid #333;
}

.info-section h3 {
    margin-bottom: 1rem;
    color: #fff;
}

.info-section ol {
    padding-left: 1.5rem;
}

.info-section li {
    margin-bottom: 0.5rem;
    color: #ccc;
}

.info-section a {
    color: #667eea;
    text-decoration: none;
}

.info-section a:hover {
    text-decoration: underline;
}

footer {
    text-align: center;
    margin-top: 2rem;
    padding-top: 2rem;
    border-top: 1px solid #333;
    color: #666;
    font-size: 0.9rem;
}

@media (max-width: 768px) {
    .container {
        padding: 1rem;
    }
    
    header h1 {
        font-size: 2rem;
    }
    
    .input-group {
        flex-direction: column;
    }
    
    .download-section,
    .info-section {
        padding: 1.5rem;
    }
}