.tool-container {
    max-width: 800px;
    margin: 30px auto;
    padding: 0 20px;
}
.tool-title {
    font-size: 24px;
    font-weight: bold;
    margin-bottom: 20px;
}
.form-group {
    margin-bottom: 20px;
}
textarea {
    width: 100%;
    padding: 12px 15px;
    border: 1px solid #ddd;
    border-radius: 6px;
    font-size: 14px;
    resize: vertical;
    box-sizing: border-box;
}

/* 优美的大小写单选按钮 */
.case-options {
    display: flex;
    gap: 20px;
    margin-bottom: 15px;
}
.case-options label {
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 14px;
    color: #333;
}
.case-options input[type="radio"] {
    appearance: auto;
    -webkit-appearance: radio;
    width: 16px;
    height: 16px;
    margin: 0;
    accent-color: #007bff;
}

/* 加密按钮组（和MD5风格一致） */
.btn-row {
    display: flex;
    gap: 12px;
    margin-bottom: 25px;
}
.btn {
    padding: 10px 20px;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 14px;
}
.btn-primary {
    background: #007bff;
    color: white;
}
.btn-default {
    background: #f1f1f1;
    color: #333;
}

/* 结果行（和MD5工具完全一致） */
.result-item {
    display: flex;
    align-items: center;
    margin-bottom: 10px;
}
.result-label {
    width: 80px;
    font-weight: 500;
    font-size: 14px;
    color: #333;
}
.result-input-group {
    flex: 1;
    display: flex;
    align-items: center;
    border: 1px solid #ddd;
    border-radius: 6px;
    overflow: hidden;
}
.result-input {
    flex: 1;
    border: none;
    padding: 10px 12px;
    font-family: monospace;
    font-size: 14px;
    outline: none;
}
.copy-btn {
    background: transparent;
    border: none;
    padding: 0 12px;
    cursor: pointer;
    color: #666;
    font-size: 16px;
}
.copy-btn:hover {
    color: #007bff;
}

.case-btn {
    padding: 8px 20px;
    border: 1px solid #ddd;
    border-radius: 6px;
    background: #fff;
    color: #333;
    cursor: pointer;
    font-size: 14px;
    transition: all 0.2s;
}
.case-btn.active {
    background: #007bff;
    color: #fff;
    border-color: #007bff;
}