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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
}

.container {
    max-width: 900px;
    width: 100%;
    background: white;
    border-radius: 20px;
    box-shadow: 0 20px 60px rgba(0,0,0,0.1);
    padding: 40px;
    animation: fadeIn 0.5s ease-in;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

header {
    text-align: center;
    margin-bottom: 30px;
}

header h1 {
    font-size: 2.5em;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 10px;
}

header p {
    color: #666;
    font-size: 1.1em;
}

.input-section {
    display: flex;
    flex-direction: column;
    gap: 15px;
    margin-bottom: 20px;
}

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

#video-url {
    flex: 1;
    padding: 12px 15px;
    border: 2px solid #e0e0e0;
    border-radius: 10px;
    font-size: 16px;
    transition: border-color 0.3s;
}

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

#language-select {
    padding: 12px 15px;
    border: 2px solid #e0e0e0;
    border-radius: 10px;
    font-size: 16px;
    background: white;
    cursor: pointer;
    transition: border-color 0.3s;
}

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

#summarize-btn {
    padding: 14px 30px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    border-radius: 10px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
}

#summarize-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 20px rgba(102, 126, 234, 0.4);
}

#summarize-btn:active {
    transform: translateY(0);
}

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

.examples {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    padding: 15px 0;
    align-items: center;
}

.examples span {
    color: #666;
    font-weight: 500;
    margin-right: 5px;
}

.example-btn {
    padding: 6px 14px;
    background: #f0f0f0;
    border: 1px solid #ddd;
    border-radius: 20px;
    font-size: 13px;
    cursor: pointer;
    transition: all 0.2s;
    color: #333;
}

.example-btn:hover {
    background: #667eea;
    color: white;
    border-color: #667eea;
    transform: scale(1.05);
}

.status {
    padding: 10px;
    text-align: center;
    color: #666;
    font-style: italic;
    margin: 10px 0;
}

.status.loading {
    color: #667eea;
    font-weight: 500;
}

.status.error {
    color: #dc3545;
    font-weight: 500;
}

#output-container {
    background: #f8f9fa;
    border-radius: 12px;
    padding: 20px;
    min-height: 200px;
    margin: 10px 0;
    border: 2px solid #e9ecef;
    transition: all 0.3s;
}

#output-container.loading {
    border-color: #667eea;
    background: #f0f3ff;
}

#output {
    color: #333;
    line-height: 1.8;
    white-space: pre-wrap;
    word-wrap: break-word;
}

.output-placeholder {
    color: #999;
    text-align: center;
    padding: 40px 20px;
}

.output-placeholder p {
    margin: 0;
}

.stats {
    padding: 10px;
    text-align: center;
    color: #666;
    font-size: 14px;
    background: #f8f9fa;
    border-radius: 8px;
    margin-top: 10px;
}

footer {
    text-align: center;
    margin-top: 30px;
    padding-top: 20px;
    border-top: 1px solid #e0e0e0;
    color: #666;
}

footer a {
    color: #667eea;
    text-decoration: none;
}

footer a:hover {
    text-decoration: underline;
}

@media (max-width: 768px) {
    .container {
        padding: 20px;
    }
    
    header h1 {
        font-size: 1.8em;
    }
    
    .input-group {
        flex-direction: column;
    }
    
    #language-select {
        width: 100%;
    }
    
    .examples {
        justify-content: center;
    }
}

.loading-spinner {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid #f3f3f3;
    border-top: 3px solid #667eea;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

.error-message {
    color: #dc3545;
    padding: 20px;
    background: #f8d7da;
    border-radius: 8px;
    border: 1px solid #f5c6cb;
}

.success-message {
    color: #155724;
    padding: 20px;
    background: #d4edda;
    border-radius: 8px;
    border: 1px solid #c3e6cb;
}