/* 基础样式重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    line-height: 1.6;
    color: #2d5a3d;
    min-height: 100vh;
}

/* 容器布局 */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* 头部样式 */
.header {
    text-align: center;
    margin-bottom: 30px;
    padding: 20px 0;
}

.title {
    font-size: 2.5rem;
    font-weight: 700;
    color: #1a4d2e;
    margin-bottom: 10px;
    text-shadow: 0 2px 4px rgba(26, 77, 46, 0.1);
}

.subtitle {
    font-size: 1.1rem;
    color: #4a7c59;
    font-weight: 400;
}

/* 主内容区域 */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 30px;
}

/* 表单区域 */
.form-section {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 20px;
    padding: 30px;
    box-shadow: 0 8px 32px rgba(26, 77, 46, 0.1);
    border: 1px solid rgba(144, 238, 144, 0.3);
}

.health-form {
    display: grid;
    gap: 20px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.form-label {
    font-weight: 600;
    color: #2d5a3d;
    font-size: 1rem;
}

.form-input,
.form-select {
    padding: 15px 20px;
    border: 2px solid #a8e6a3;
    border-radius: 12px;
    font-size: 1rem;
    background: #f8fff8;
    color: #2d5a3d;
    transition: all 0.3s ease;
}

.form-input:focus,
.form-select:focus {
    outline: none;
    border-color: #4caf50;
    box-shadow: 0 0 0 3px rgba(76, 175, 80, 0.1);
    background: #ffffff;
}

.form-input::placeholder {
    color: #81c784;
}

/* 提交按钮 */
.submit-btn {
    background: linear-gradient(135deg, #4caf50, #66bb6a);
    color: white;
    border: none;
    padding: 18px 30px;
    border-radius: 12px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
    margin-top: 10px;
}

.submit-btn:hover {
    background: linear-gradient(135deg, #45a049, #5cb85c);
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(76, 175, 80, 0.3);
}

.submit-btn:active {
    transform: translateY(0);
}

.submit-btn:disabled {
    background: #c8e6c9;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

/* 加载动画 */
.loading-spinner {
    width: 20px;
    height: 20px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top: 2px solid white;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* 结果区域 */
.result-section {
    animation: fadeInUp 0.6s ease-out;
}

.result-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 25px;
    flex-wrap: wrap;
    gap: 15px;
}

.result-title {
    font-size: 2rem;
    color: #1a4d2e;
    font-weight: 700;
}

.reset-btn {
    background: #e8f5e8;
    color: #2d5a3d;
    border: 2px solid #a8e6a3;
    padding: 10px 20px;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.reset-btn:hover {
    background: #d4edda;
    border-color: #4caf50;
}

/* 结果卡片 */
.result-content {
    display: grid;
    gap: 20px;
}

.basic-info-card,
.bmi-card,
.weight-card,
.metabolism-card,
.body-fat-card,
.measurements-card,
.advice-card,
.disclaimer-card {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 16px;
    padding: 25px;
    box-shadow: 0 6px 20px rgba(26, 77, 46, 0.08);
    border: 1px solid rgba(144, 238, 144, 0.2);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.basic-info-card:hover,
.bmi-card:hover,
.weight-card:hover,
.metabolism-card:hover,
.body-fat-card:hover,
.measurements-card:hover,
.advice-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(26, 77, 46, 0.12);
}

.card-title {
    font-size: 1.4rem;
    color: #1a4d2e;
    font-weight: 700;
    margin-bottom: 15px;
    border-bottom: 2px solid #e8f5e8;
    padding-bottom: 10px;
}

/* 信息网格 */
.info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 15px;
}

.info-item {
    background: #f8fff8;
    padding: 15px;
    border-radius: 10px;
    border-left: 4px solid #4caf50;
}

.info-label {
    font-size: 0.9rem;
    color: #4a7c59;
    font-weight: 600;
    margin-bottom: 5px;
}

.info-value {
    font-size: 1.2rem;
    color: #2d5a3d;
    font-weight: 700;
}

/* BMI 特殊样式 */
.bmi-value {
    font-size: 2.5rem;
    font-weight: 800;
    color: #4caf50;
    text-align: center;
    margin: 15px 0;
}

.bmi-category {
    text-align: center;
    font-size: 1.3rem;
    font-weight: 600;
    color: #2d5a3d;
    background: #e8f5e8;
    padding: 10px;
    border-radius: 8px;
    margin: 10px 0;
}

/* 健康建议列表 */
.health-tips {
    list-style: none;
    padding: 0;
}

.health-tips li {
    background: #f8fff8;
    margin: 10px 0;
    padding: 12px 15px;
    border-radius: 8px;
    border-left: 4px solid #81c784;
    position: relative;
}

.health-tips li::before {
    content: "✓";
    color: #4caf50;
    font-weight: bold;
    margin-right: 10px;
}

/* 免责声明 */
.disclaimer {
    background: #fff3cd;
    border: 1px solid #ffeaa7;
    color: #856404;
    padding: 15px;
    border-radius: 8px;
    font-size: 0.95rem;
    line-height: 1.5;
    text-align: center;
}

/* 错误区域 */
.error-section {
    text-align: center;
    padding: 40px 20px;
}

.error-content {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 16px;
    padding: 30px;
    box-shadow: 0 6px 20px rgba(220, 53, 69, 0.1);
    border: 1px solid rgba(220, 53, 69, 0.2);
    max-width: 400px;
    margin: 0 auto;
}

.error-title {
    color: #dc3545;
    font-size: 1.5rem;
    margin-bottom: 15px;
}

.error-message {
    color: #6c757d;
    margin-bottom: 20px;
}

.retry-btn {
    background: #dc3545;
    color: white;
    border: none;
    padding: 12px 24px;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.3s ease;
}

.retry-btn:hover {
    background: #c82333;
}

/* 底部 */
.footer {
    text-align: center;
    padding: 20px 0;
    margin-top: 30px;
    border-top: 1px solid rgba(144, 238, 144, 0.3);
}

.footer-text {
    color: #4a7c59;
    font-size: 0.9rem;
}

/* 动画效果 */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 平板端适配 (768px - 1024px) */
@media (min-width: 768px) and (max-width: 1024px) {
    .container {
        padding: 30px;
    }
    
    .title {
        font-size: 2.8rem;
    }
    
    .form-section {
        padding: 35px;
    }
    
    .health-form {
        grid-template-columns: repeat(2, 1fr);
        gap: 25px;
    }
    
    .form-group:last-child {
        grid-column: 1 / -1;
    }
    
    .result-content {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .advice-card,
    .disclaimer-card {
        grid-column: 1 / -1;
    }
}

/* 电脑端适配 (1024px+) */
@media (min-width: 1024px) {
    .container {
        padding: 40px;
        max-width: 1400px;
    }
    
    .title {
        font-size: 3.2rem;
    }
    
    .main-content {
        flex-direction: row;
        gap: 40px;
        align-items: flex-start;
    }
    
    .form-section {
        flex: 0 0 380px;
        position: sticky;
        top: 20px;
        max-height: calc(100vh - 40px);
        overflow-y: auto;
    }
    
    .result-section,
    .error-section {
        flex: 1;
        min-width: 0;
    }
    
    /* 桌面端结果区域重新设计 - 使用更清晰的布局 */
    .result-content {
        display: grid;
        grid-template-columns: repeat(3, 1fr);
        gap: 25px;
        grid-auto-rows: min-content;
    }
    
    /* 基本信息卡片 - 占满第一行 */
    .basic-info-card {
        grid-column: 1 / -1;
    }
    
    /* 第二行：BMI、体重评估、代谢分析 */
    .bmi-card,
    .weight-card,
    .metabolism-card {
        grid-column: span 1;
    }
    
    /* 第三行：体脂分析和理想三围 */
    .body-fat-card {
        grid-column: span 2;
    }
    
    .measurements-card {
        grid-column: span 1;
    }
    
    /* 第四行：健康建议 - 占满整行 */
    .advice-card {
        grid-column: 1 / -1;
    }
    
    /* 第五行：免责声明 - 占满整行 */
    .disclaimer-card {
        grid-column: 1 / -1;
    }
    
    /* 基本信息网格优化 */
    .basic-info-card .info-grid {
        grid-template-columns: repeat(4, 1fr);
        gap: 20px;
    }
    
    /* BMI卡片特殊布局 */
    .bmi-card {
        display: flex;
        flex-direction: column;
        min-height: 280px;
    }
    
    .bmi-card .bmi-content {
        flex: 1;
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        text-align: center;
    }
    
    .bmi-value {
        font-size: 3rem;
        margin: 20px 0;
    }
    
    /* 体重评估卡片布局优化 */
    .weight-card {
        display: flex;
        flex-direction: column;
        min-height: 280px;
    }
    
    .weight-card .weight-content {
        flex: 1;
        display: flex;
        flex-direction: column;
        justify-content: space-between;
    }
    
    .weight-card .info-grid {
        grid-template-columns: 1fr;
        gap: 12px;
    }
    
    /* 代谢分析卡片布局优化 */
    .metabolism-card {
        display: flex;
        flex-direction: column;
        min-height: 280px;
    }
    
    .metabolism-card .metabolism-content {
        flex: 1;
        display: flex;
        flex-direction: column;
        justify-content: space-between;
    }
    
    .metabolism-card .info-grid {
        grid-template-columns: 1fr;
        gap: 12px;
    }
    
    /* 体脂分析卡片网格优化 */
    .body-fat-card .info-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 15px;
    }
    
    /* 理想三围卡片网格优化 */
    .measurements-card {
        display: flex;
        flex-direction: column;
        min-height: 200px;
    }
    
    .measurements-card .measurements-content {
        flex: 1;
        display: flex;
        flex-direction: column;
        justify-content: center;
    }
    
    .measurements-card .info-grid {
        grid-template-columns: 1fr;
        gap: 15px;
    }
    
    /* 健康建议卡片布局优化 */
    .advice-card {
        padding: 30px;
    }
    
    .advice-card .advice-content {
        display: grid;
        grid-template-columns: repeat(3, 1fr);
        gap: 25px;
        margin-bottom: 25px;
    }
    
    .advice-card .health-tips {
        grid-column: 1 / -1;
        display: grid;
        grid-template-columns: repeat(2, 1fr);
        gap: 15px;
        list-style: none;
        padding: 0;
    }
    
    /* 表单区域优化 */
    .health-form {
        display: grid;
        gap: 25px;
    }
    
    .form-group {
        margin-bottom: 0;
    }
    
    .submit-btn {
        margin-top: 20px;
        padding: 20px 30px;
        font-size: 1.2rem;
    }
}

/* 手机端适配 (最高优先级) */
@media (max-width: 767px) {
    .container {
        padding: 15px;
    }
    
    .header {
        margin-bottom: 20px;
        padding: 15px 0;
    }
    
    .title {
        font-size: 2rem;
    }
    
    .subtitle {
        font-size: 1rem;
    }
    
    .form-section {
        padding: 20px;
        border-radius: 16px;
    }
    
    .form-input,
    .form-select {
        padding: 12px 16px;
        font-size: 16px; /* 防止iOS缩放 */
    }
    
    .submit-btn {
        padding: 16px 24px;
        font-size: 1rem;
    }
    
    .result-header {
        flex-direction: column;
        align-items: stretch;
        gap: 15px;
    }
    
    .result-title {
        font-size: 1.6rem;
        text-align: center;
    }
    
    .reset-btn {
        align-self: center;
        padding: 12px 24px;
    }
    
    .basic-info-card,
    .bmi-card,
    .weight-card,
    .metabolism-card,
    .body-fat-card,
    .measurements-card,
    .advice-card,
    .disclaimer-card {
        padding: 20px;
        border-radius: 12px;
    }
    
    .card-title {
        font-size: 1.2rem;
    }
    
    .info-grid {
        grid-template-columns: 1fr;
        gap: 12px;
    }
    
    .bmi-value {
        font-size: 2rem;
    }
    
    .bmi-category {
        font-size: 1.1rem;
    }
    
    .health-tips li {
        padding: 10px 12px;
        font-size: 0.95rem;
    }
    
    .error-content {
        padding: 25px 20px;
    }
}