* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    background-color: #f8f9fa;
    color: #333;
    line-height: 1.6;
}

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

header {
    text-align: center;
    padding: 40px 0;
    background-color: white;
    border-radius: 10px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
    margin-bottom: 30px;
}

header h1 {
    font-size: 2.5rem;
    color: #2c3e50;
    margin-bottom: 10px;
}

header p {
    color: #7f8c8d;
    font-size: 1.1rem;
}

.converter-section {
    display: flex;
    flex-wrap: wrap;
    gap: 30px;
    margin-bottom: 40px;
}

.input-section {
    flex: 1;
    min-width: 300px;
    background-color: white;
    border-radius: 10px;
    padding: 25px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}

.output-section {
    flex: 1;
    min-width: 300px;
    background-color: white;
    border-radius: 10px;
    padding: 25px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
    display: flex;
    flex-direction: column;
}

.section-title {
    display: flex;
    align-items: center;
    margin-bottom: 20px;
    color: #2c3e50;
    font-size: 1.3rem;
}

.section-title i {
    margin-right: 10px;
    color: #3498db;
}

.input-methods {
    display: flex;
    margin-bottom: 20px;
    border-bottom: 1px solid #eee;
}

.input-method {
    padding: 10px 20px;
    cursor: pointer;
    font-weight: 500;
    transition: all 0.3s;
    border-bottom: 3px solid transparent;
}

.input-method.active {
    color: #3498db;
    border-bottom: 3px solid #3498db;
}

.input-area {
    display: none;
}

.input-area.active {
    display: block;
}

#textInput {
    width: 100%;
    height: 300px;
    padding: 15px;
    border: 1px solid #e0e0e0;
    border-radius: 8px;
    resize: vertical;
    font-size: 1rem;
    line-height: 1.5;
}

.file-upload-area {
    border: 2px dashed #e0e0e0;
    border-radius: 8px;
    padding: 40px 20px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s;
}

.file-upload-area:hover {
    border-color: #3498db;
    background-color: #f8fafc;
}

.file-upload-area i {
    font-size: 3rem;
    color: #7f8c8d;
    margin-bottom: 15px;
}

.file-upload-area p {
    color: #7f8c8d;
    margin-bottom: 15px;
}

.upload-btn {
    background-color: #3498db;
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 5px;
    cursor: pointer;
    font-weight: 500;
    transition: background-color 0.3s;
}

.upload-btn:hover {
    background-color: #2980b9;
}

#fileName {
    margin-top: 10px;
    font-size: 0.9rem;
    color: #7f8c8d;
}

.preview-area {
    flex-grow: 1;
    border: 1px solid #e0e0e0;
    border-radius: 8px;
    padding: 20px;
    margin-bottom: 20px;
    overflow-y: auto;
    max-height: 400px;
    background-color: #fcfcfc;
}

.action-buttons {
    display: flex;
    gap: 15px;
}

.btn {
    flex: 1;
    padding: 12px 20px;
    border: none;
    border-radius: 5px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.btn-primary {
    background-color: #3498db;
    color: white;
}

.btn-primary:hover {
    background-color: #2980b9;
}

.btn-secondary {
    background-color: #ecf0f1;
    color: #2c3e50;
}

.btn-secondary:hover {
    background-color: #dde4e6;
}

.features {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    margin-bottom: 40px;
}

.feature-card {
    flex: 1;
    min-width: 250px;
    background-color: white;
    border-radius: 10px;
    padding: 25px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
    text-align: center;
}

.feature-card i {
    font-size: 2.5rem;
    color: #3498db;
    margin-bottom: 15px;
}

.feature-card h3 {
    color: #2c3e50;
    margin-bottom: 10px;
}

.feature-card p {
    color: #7f8c8d;
}

footer {
    text-align: center;
    padding: 20px;
    color: #7f8c8d;
    font-size: 0.9rem;
    border-top: 1px solid #eee;
    margin-top: 30px;
}

@media (max-width: 768px) {
    .converter-section {
        flex-direction: column;
    }
    
    .input-section, .output-section {
        width: 100%;
    }
}