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

:root {
    --primary-color: #3498db;
    --secondary-color: #2ecc71;
    --accent-color: #e74c3c;
    --background-color: #f5f5f5;
    --card-background: #ffffff;
    --text-color: #333333;
    --text-secondary: #7f8c8d;
    --border-color: #dddddd;
    --shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
}

[data-theme="dark"] {
    --background-color: #1a1a1a;
    --card-background: #2d2d2d;
    --text-color: #e0e0e0;
    --text-secondary: #b0b0b0;
    --border-color: #444444;
    --shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    line-height: 1.6;
    transition: var(--transition);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

header {
    text-align: center;
    margin-bottom: 30px;
    padding: 40px 20px;
    background-color: var(--card-background);
    border-radius: 12px;
    box-shadow: var(--shadow);
    position: relative;
    transition: var(--transition);
}

header h1 {
    color: var(--primary-color);
    margin-bottom: 10px;
    font-size: 2.8rem;
    font-weight: 700;
}

header p {
    color: var(--text-secondary);
    font-size: 1.2rem;
    margin-bottom: 20px;
}

.theme-toggle {
    position: absolute;
    top: 20px;
    right: 20px;
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    transition: var(--transition);
    color: var(--text-color);
}

.theme-toggle:hover {
    transform: scale(1.1);
}

.tabs {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-bottom: 30px;
    flex-wrap: wrap;
}

.tab-btn {
    padding: 12px 24px;
    border: none;
    border-radius: 30px;
    background-color: var(--card-background);
    color: var(--text-color);
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: var(--shadow);
}

.tab-btn:hover {
    background-color: var(--primary-color);
    color: white;
    transform: translateY(-2px);
}

.tab-btn.active {
    background-color: var(--primary-color);
    color: white;
}

.tab-content {
    display: none;
    animation: fadeIn 0.5s ease;
}

.tab-content.active {
    display: block;
}

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

.module-container {
    background-color: var(--card-background);
    border-radius: 12px;
    padding: 30px;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.module-container h2 {
    color: var(--primary-color);
    margin-bottom: 30px;
    font-size: 2rem;
    text-align: center;
}

.tool-card {
    background-color: var(--background-color);
    border-radius: 8px;
    padding: 20px;
    margin-bottom: 20px;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.tool-card h3 {
    color: var(--text-color);
    margin-bottom: 15px;
    font-size: 1.3rem;
}

input[type="file"] {
    width: 100%;
    padding: 10px;
    margin-bottom: 15px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    background-color: var(--card-background);
    color: var(--text-color);
    transition: var(--transition);
}

input[type="range"] {
    width: 100%;
    margin: 10px 0;
}

input[type="number"],
input[type="text"],
select {
    padding: 8px 12px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    background-color: var(--card-background);
    color: var(--text-color);
    margin-right: 10px;
    margin-bottom: 10px;
    transition: var(--transition);
}

button {
    padding: 10px 20px;
    border: none;
    border-radius: 4px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    margin-right: 10px;
    margin-bottom: 10px;
}

button:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

#extract-audio-btn,
#compress-video-btn,
#cut-video-btn,
#cut-audio-btn,
#adjust-volume-btn,
#audio-to-text-btn,
#convert-audio-btn {
    background-color: var(--primary-color);
    color: white;
}

#extract-audio-btn:hover,
#compress-video-btn:hover,
#cut-video-btn:hover,
#cut-audio-btn:hover,
#adjust-volume-btn:hover,
#audio-to-text-btn:hover,
#convert-audio-btn:hover {
    background-color: #2980b9;
}

.download-link {
    display: inline-block;
    padding: 10px 20px;
    background-color: var(--secondary-color);
    color: white;
    text-decoration: none;
    border-radius: 4px;
    margin-top: 10px;
    transition: var(--transition);
}

.download-link:hover {
    background-color: #27ae60;
    transform: translateY(-1px);
}

.cut-controls {
    display: flex;
    gap: 10px;
    margin-bottom: 15px;
    flex-wrap: wrap;
}

.text-input-section,
.text-output-section {
    margin-bottom: 20px;
}

textarea {
    width: 100%;
    height: 200px;
    padding: 15px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    background-color: var(--card-background);
    color: var(--text-color);
    font-family: inherit;
    resize: vertical;
    transition: var(--transition);
}

textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(52, 152, 219, 0.2);
}

.text-tools {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
    margin-bottom: 20px;
}

.tool-group {
    background-color: var(--background-color);
    border-radius: 8px;
    padding: 20px;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.tool-group h3 {
    color: var(--text-color);
    margin-bottom: 15px;
    font-size: 1.2rem;
}

.replace-controls {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    margin-bottom: 10px;
}

.text-stats {
    display: flex;
    gap: 20px;
    margin: 10px 0;
    padding: 10px;
    background-color: var(--background-color);
    border-radius: 4px;
    font-size: 14px;
    color: var(--text-secondary);
}

.text-actions {
    display: flex;
    gap: 10px;
    margin-top: 10px;
    flex-wrap: wrap;
}

#copy-result-btn {
    background-color: var(--secondary-color);
    color: white;
}

#copy-result-btn:hover {
    background-color: #27ae60;
}

#clear-text-btn {
    background-color: var(--accent-color);
    color: white;
}

#clear-text-btn:hover {
    background-color: #c0392b;
}

#remove-duplicates-btn,
#remove-empty-lines-btn,
#remove-spaces-btn,
#uppercase-btn,
#lowercase-btn,
#capitalize-btn,
#camelcase-btn,
#snakecase-btn,
#simplified-to-traditional-btn,
#replace-btn,
#compare-btn {
    background-color: var(--primary-color);
    color: white;
}

#remove-duplicates-btn:hover,
#remove-empty-lines-btn:hover,
#remove-spaces-btn:hover,
#uppercase-btn:hover,
#lowercase-btn:hover,
#capitalize-btn:hover,
#camelcase-btn:hover,
#snakecase-btn:hover,
#simplified-to-traditional-btn:hover,
#replace-btn:hover,
#compare-btn:hover {
    background-color: #2980b9;
}

.text-result {
    margin-top: 15px;
    padding: 15px;
    background-color: var(--card-background);
    border-radius: 4px;
    border: 1px solid var(--border-color);
    min-height: 100px;
    color: var(--text-color);
}

footer {
    text-align: center;
    margin-top: 40px;
    padding: 30px;
    background-color: var(--card-background);
    border-radius: 12px;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

footer p {
    color: var(--text-secondary);
    margin-bottom: 10px;
}

@media (max-width: 768px) {
    .container {
        padding: 10px;
    }
    
    header h1 {
        font-size: 2rem;
    }
    
    .module-container {
        padding: 20px;
    }
    
    .tabs {
        flex-direction: column;
        align-items: center;
    }
    
    .tab-btn {
        width: 100%;
        max-width: 300px;
    }
    
    .text-tools {
        grid-template-columns: 1fr;
    }
    
    .cut-controls,
    .replace-controls {
        flex-direction: column;
    }
    
    input[type="number"],
    input[type="text"],
    select {
        width: 100%;
        margin-right: 0;
    }
    
    button {
        width: 100%;
        margin-right: 0;
    }
    
    .text-stats {
        flex-direction: column;
        gap: 5px;
    }
}