/* 全局样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #667eea;
    --secondary-color: #764ba2;
    --success-color: #48bb78;
    --danger-color: #f56565;
    --background: #f7fafc;
    --card-background: #ffffff;
    --text-primary: #2d3748;
    --text-secondary: #718096;
    --border-color: #e2e8f0;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.15);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB',
        'Microsoft YaHei', 'Helvetica Neue', Helvetica, Arial, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 20px;
    color: var(--text-primary);
}

.container {
    max-width: 900px;
    margin: 0 auto;
    background: var(--card-background);
    border-radius: 16px;
    box-shadow: var(--shadow-lg);
    overflow: hidden;
}

/* 头部样式 */
header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 40px 30px;
    text-align: center;
}

header h1 {
    font-size: 2.5em;
    margin-bottom: 10px;
    font-weight: 700;
}

.subtitle {
    font-size: 1em;
    opacity: 0.95;
}

/* 标签页样式 */
.tabs {
    display: flex;
    background: #f7fafc;
    border-bottom: 2px solid var(--border-color);
}

.tab-button {
    flex: 1;
    padding: 18px 20px;
    border: none;
    background: transparent;
    cursor: pointer;
    font-size: 1em;
    font-weight: 600;
    color: var(--text-secondary);
    transition: all 0.3s ease;
    position: relative;
}

.tab-button:hover {
    background: rgba(102, 126, 234, 0.1);
    color: var(--primary-color);
}

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

.tab-button.active::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--primary-color);
}

/* 标签页内容 */
.tab-content {
    display: none;
    padding: 30px;
    animation: fadeIn 0.3s ease;
}

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

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 工具区域 */
.tool-section h2 {
    margin-bottom: 25px;
    color: var(--text-primary);
    font-size: 1.5em;
    font-weight: 600;
}

/* 输入组 */
.input-group {
    margin-bottom: 20px;
}

.input-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: var(--text-primary);
}

.input-text,
.output-text {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 0.95em;
    font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
    resize: vertical;
    min-height: 120px;
    transition: border-color 0.3s ease;
}

.input-text:focus,
.output-text:focus {
    outline: none;
    border-color: var(--primary-color);
}

.input-field {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 0.95em;
    transition: border-color 0.3s ease;
}

.input-field:focus {
    outline: none;
    border-color: var(--primary-color);
}

/* 算法选择器 */
.algorithm-selector {
    margin-bottom: 20px;
    padding: 15px;
    background: #f7fafc;
    border-radius: 8px;
}

.algorithm-selector label {
    display: block;
    margin-bottom: 12px;
    font-weight: 600;
    color: var(--text-primary);
}

.radio-group {
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
}

.radio-group label {
    display: inline-flex;
    align-items: center;
    cursor: pointer;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 0;
}

.radio-group input[type="radio"] {
    margin-right: 6px;
    cursor: pointer;
    accent-color: var(--primary-color);
}

/* 按钮样式 */
.button-group {
    display: flex;
    gap: 12px;
    margin-bottom: 20px;
}

.btn-primary,
.btn-secondary,
.btn-copy {
    padding: 12px 24px;
    border: none;
    border-radius: 8px;
    font-size: 1em;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.btn-primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    flex: 1;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

.btn-secondary {
    background: white;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
    flex: 1;
}

.btn-secondary:hover {
    background: var(--primary-color);
    color: white;
}

.btn-copy {
    background: var(--success-color);
    color: white;
    padding: 8px 16px;
    font-size: 0.9em;
}

.btn-copy:hover {
    background: #38a169;
}

/* 输出区域 */
.output-group {
    margin-top: 20px;
}

.output-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: var(--text-primary);
}

.output-wrapper {
    position: relative;
}

.output-text {
    background: #f7fafc;
}

.btn-copy {
    position: absolute;
    top: 10px;
    right: 10px;
}

/* 底部 */
footer {
    text-align: center;
    padding: 20px;
    background: #f7fafc;
    color: var(--text-secondary);
    font-size: 0.9em;
    border-top: 1px solid var(--border-color);
}

/* 响应式设计 */
@media (max-width: 768px) {
    body {
        padding: 10px;
    }

    header h1 {
        font-size: 1.8em;
    }

    .tab-button {
        padding: 14px 10px;
        font-size: 0.9em;
    }

    .tab-content {
        padding: 20px 15px;
    }

    .radio-group {
        flex-direction: column;
        gap: 10px;
    }

    .button-group {
        flex-direction: column;
    }
}

/* 提示消息 */
.toast {
    position: fixed;
    top: 20px;
    right: 20px;
    padding: 12px 20px;
    background: var(--success-color);
    color: white;
    border-radius: 8px;
    box-shadow: var(--shadow);
    z-index: 1000;
    animation: slideIn 0.3s ease;
}

@keyframes slideIn {
    from {
        transform: translateX(400px);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

.toast.error {
    background: var(--danger-color);
}