.converter-container {
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
    font-family: 'Arial', 'Helvetica', sans-serif;
    background: #f8f9fa;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.converter-header {
    text-align: center;
    margin-bottom: 30px;
    padding-bottom: 20px;
    border-bottom: 2px solid #e9ecef;
}

.converter-header h2 {
    color: #2c3e50;
    margin-bottom: 10px;
    font-size: 28px;
}

.converter-header p {
    color: #7f8c8d;
    font-size: 16px;
}

.converter-tabs {
    display: flex;
    margin-bottom: 20px;
    background: white;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

.tab-button {
    flex: 1;
    padding: 15px 20px;
    border: none;
    background: #ecf0f1;
    color: #2c3e50;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.tab-button:hover {
    background: #d5dbdb;
}

.tab-button.active {
    background: #3498db;
    color: white;
}

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

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

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.input-group {
    margin-bottom: 20px;
}

.input-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: #2c3e50;
}

.input-group textarea {
    width: 100%;
    padding: 15px;
    border: 2px solid #e9ecef;
    border-radius: 8px;
    font-size: 16px;
    resize: vertical;
    transition: border-color 0.3s ease;
    font-family: 'Arial Unicode MS', 'Microsoft Sans Serif', sans-serif;
}

.input-group textarea:focus {
    outline: none;
    border-color: #3498db;
}

.input-group textarea[readonly] {
    background-color: #f8f9fa;
    color: #495057;
}

.convert-btn, .copy-btn {
    padding: 12px 30px;
    border: none;
    border-radius: 6px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    margin-right: 10px;
    margin-bottom: 10px;
}

.convert-btn {
    background: #27ae60;
    color: white;
}

.convert-btn:hover {
    background: #219a52;
    transform: translateY(-2px);
}

.copy-btn {
    background: #e67e22;
    color: white;
}

.copy-btn:hover {
    background: #d35400;
    transform: translateY(-2px);
}

.hint {
    color: #7f8c8d;
    font-style: italic;
    margin-top: 5px;
    display: block;
}

.converter-footer {
    margin-top: 30px;
    padding-top: 20px;
    border-top: 2px solid #e9ecef;
}

.quick-help h4 {
    color: #2c3e50;
    margin-bottom: 15px;
}

.quick-help ul {
    list-style-type: none;
    padding: 0;
}

.quick-help li {
    padding: 8px 0;
    color: #7f8c8d;
    position: relative;
    padding-left: 20px;
}

.quick-help li:before {
    content: '•';
    color: #3498db;
    position: absolute;
    left: 0;
    font-weight: bold;
}

/* Responsive Design */
@media (max-width: 768px) {
    .converter-container {
        padding: 15px;
        margin: 10px;
    }
    
    .converter-tabs {
        flex-direction: column;
    }
    
    .tab-button {
        padding: 12px 15px;
        font-size: 13px;
    }
    
    .converter-header h2 {
        font-size: 24px;
    }
    
    .input-group textarea {
        font-size: 14px;
        padding: 12px;
    }
    
    .convert-btn, .copy-btn {
        width: 100%;
        margin-right: 0;
        margin-bottom: 10px;
    }
}

/* Loading state */
.loading {
    opacity: 0.7;
    pointer-events: none;
}

/* Success animation */
@keyframes success {
    0% { background-color: #27ae60; }
    50% { background-color: #2ecc71; }
    100% { background-color: #27ae60; }
}

.success {
    animation: success 0.5s ease;
}