.tool-container {
    max-width: 900px;
    margin: 30px auto;
    padding: 0 15px;
}
.tool-title {
    font-size: 24px;
    font-weight: 600;
    text-align: center;
    margin-bottom: 20px;
    color: #333;
}
.tool-desc {
    text-align: center;
    color: #666;
    margin-bottom: 30px;
    line-height: 1.6;
}
.converter-box {
    display: flex;
    flex-direction: column;
    gap: 20px;
}
.text-area-box {
    display: flex;
    flex-direction: column;
    gap: 10px;
}
.text-area-box label {
    font-weight: 500;
    color: #333;
    font-size: 16px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
textarea {
    width: 100%;
    min-height: 180px;
    padding: 15px;
    border: 1px solid #e0e0e0;
    border-radius: 8px;
    resize: vertical;
    font-size: 15px;
    line-height: 1.6;
    font-family: inherit;
    outline: none;
    transition: border 0.2s;
}
textarea:focus {
    border-color: #409eff;
}
.btn-group {
    display: flex;
    justify-content: center;
    gap: 15px;
    flex-wrap: wrap;
}
.converter-btn {
    padding: 10px 24px;
    border-radius: 6px;
    border: none;
    background: #409eff;
    color: #fff;
    font-size: 15px;
    cursor: pointer;
    transition: background 0.2s;
}
.converter-btn:hover {
    background: #338eef;
}
.converter-btn.gray {
    background: #9099a3;
}
.copy-btn {
    padding: 4px 10px;
    font-size: 13px;
    background: #f5f5f5;
    border: 1px solid #e0e0e0;
    border-radius: 4px;
    cursor: pointer;
}