/* 通用样式 */
:root {
    --primary-color: #2A5C82;
    --secondary-color: #4CAF50;
    --background: #f5f7fa;
    --warning-red: #F44336;
    --safe-green: #4CAF50;
    --info-blue: #2196F3;
}

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

body {
    background: var(--background);
    line-height: 1.6;
    color: #333;
}

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

/* 语言切换 */
.language-switcher {
    text-align: right;
    margin-bottom: 20px;
}

.lang-btn {
    padding: 8px 15px;
    margin: 0 5px;
    border: 1px solid var(--primary-color);
    border-radius: 5px;
    cursor: pointer;
    background: white;
}

/* 通用计算器样式 */
.calculator-box {
    background: white;
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 2px 15px rgba(0,0,0,0.1);
    margin-bottom: 30px;
}

.input-group {
    margin-bottom: 20px;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 15px;
}

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

input[type="number"],
select {
    width: 100%;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 5px;
    transition: border-color 0.3s;
}

input[type="number"]:focus,
select:focus {
    border-color: var(--primary-color);
    outline: none;
}

button {
    background: var(--primary-color);
    color: white;
    padding: 12px 25px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 16px;
    transition: background 0.3s;
}

button:hover {
    background: #1a3d5a;
}

/* 结果样式 */
.result-box {
    background: #f8f9fa;
    padding: 25px;
    border-radius: 10px;
    margin-top: 25px;
}

.advice-list {
    padding-left: 20px;
    margin: 15px 0;
}

.advice-list li {
    margin-bottom: 10px;
    padding-left: 10px;
    border-left: 3px solid var(--primary-color);
}

/* 特殊组件 */
.gender-selector {
    display: flex;
    gap: 15px;
    margin-bottom: 20px;
}

.gender-btn {
    padding: 15px 25px;
    border: 2px solid #ddd;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s;
    display: flex;
    align-items: center;
    gap: 8px;
}

.gender-btn.active {
    border-color: var(--primary-color);
    background: rgba(42,92,130,0.1);
}

/* 状态指示 */
.status-indicator {
    padding: 10px 15px;
    border-radius: 5px;
    color: white;
    display: inline-block;
}

.status-underweight { background: var(--info-blue); }
.status-normal { background: var(--safe-green); }
.status-overweight { background: #FFC107; }
.status-obese { background: var(--warning-red); }

/* 响应式设计 */
@media (max-width: 768px) {
    .container {
        padding: 10px;
    }
    
    .input-group {
        grid-template-columns: 1fr;
    }
    
    .gender-selector {
        flex-direction: column;
    }
}

/* 主页补充样式 */
.hero-section .subtitle {
    font-size: 1.2em;
    margin-top: 15px;
    opacity: 0.9;
}

.tool-btn {
    display: inline-block;
    background: var(--primary-color);
    color: white;
    padding: 12px 25px;
    border-radius: 5px;
    text-decoration: none;
    margin-top: 20px;
    transition: background 0.3s;
}

.tool-btn:hover {
    background: #1a3d5a;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin: 25px 0;
}

.feature-card {
    background: #f8f9fa;
    padding: 20px;
    border-radius: 8px;
    border: 1px solid #eee;
}

.feature-card h4 {
    color: var(--primary-color);
    margin-bottom: 10px;
}

@media (max-width: 480px) {
    .hero-section {
        padding: 40px 15px;
    }
    
    .tool-card {
        padding: 20px;
    }
}
        .hero-section {
            text-align: center;
            padding: 60px 20px;
            background: var(--primary-color);
            color: white;
            border-radius: 10px;
            margin-bottom: 40px;
        }

        .tool-card {
            background: white;
            padding: 25px;
            border-radius: 10px;
            box-shadow: 0 2px 15px rgba(0,0,0,0.1);
            transition: transform 0.3s;
        }

        .tool-card:hover {
            transform: translateY(-5px);
        }

        .tool-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 25px;
            margin: 40px 0;