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

:root {
    --primary-color: #ff4757;
    --primary-hover: #ff3742;
    --bg-color: #0f0f0f;
    --card-bg: #1a1a1a;
    --text-color: #ffffff;
    --text-secondary: #b0b0b0;
    --border-color: #333;
    --success-color: #2ed573;
    --error-color: #ff6b81;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    min-height: 100vh;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

header {
    text-align: center;
    margin-bottom: 40px;
    padding-top: 40px;
}

header h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
    background: linear-gradient(45deg, var(--primary-color), #ffa502);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

header p {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

.download-form {
    background: var(--card-bg);
    padding: 30px;
    border-radius: 15px;
    border: 1px solid var(--border-color);
    margin-bottom: 30px;
}

.input-group {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
}

#urlInput {
    flex: 1;
    padding: 15px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    background: var(--bg-color);
    color: var(--text-color);
    font-size: 16px;
    transition: border-color 0.3s;
}

#urlInput:focus {
    outline: none;
    border-color: var(--primary-color);
}

#downloadBtn {
    padding: 15px 30px;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 16px;
    font-weight: 600;
    transition: background 0.3s;
    display: flex;
    align-items: center;
    gap: 10px;
    min-width: 140px;
    justify-content: center;
}

#downloadBtn:hover:not(:disabled) {
    background: var(--primary-hover);
}

#downloadBtn:disabled {
    opacity: 0.7;
    cursor: not-allowed;
}

.options {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
}

.option-group {
    display: flex;
    flex-direction: column;
    gap: 5px;
}

.option-group label {
    color: var(--text-secondary);
    font-size: 14px;
}

.option-group select {
    padding: 10px;
    border: 1px solid var(--border-color);
    border-radius: 5px;
    background: var(--bg-color);
    color: var(--text-color);
    cursor: pointer;
}

.result-container {
    background: var(--card-bg);
    border-radius: 15px;
    padding: 20px;
    border: 1px solid var(--border-color);
    display: none;
}

.result-container.show {
    display: block;
    animation: fadeIn 0.3s ease;
}

.result-success {
    border-left: 4px solid var(--success-color);
}

.result-error {
    border-left: 4px solid var(--error-color);
}

.download-link {
    display: inline-block;
    padding: 12px 25px;
    background: var(--success-color);
    color: white;
    text-decoration: none;
    border-radius: 5px;
    font-weight: 600;
    transition: transform 0.2s;
    margin-top: 15px;
}

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

.error-message {
    color: var(--error-color);
    font-weight: 600;
}

.spinner {
    width: 20px;
    height: 20px;
    border: 2px solid transparent;
    border-top: 2px solid white;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    display: none;
}

.spinner.show {
    display: block;
}

footer {
    margin-top: auto;
    text-align: center;
    padding: 20px;
    color: var(--text-secondary);
    font-size: 14px;
}

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

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

@media (max-width: 768px) {
    .container {
        padding: 10px;
    }
    
    .input-group {
        flex-direction: column;
    }
    
    .options {
        flex-direction: column;
    }
    
    header h1 {
        font-size: 2rem;
    }
}