/* ========================================
   在线BMI健康检测 - 003bmi.css
   Apple风格 + 网站紫色主题融合版
   ======================================== */

/* 全局重置 */
body, html {
    margin: 0;
    padding: 0;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

*, *::before, *::after {
    box-sizing: border-box;
}

/* ========================================
   工具页面通用顶部底部样式
   所有工具页面共用
   ======================================== */

/* 顶部导航 */
.tool-header {
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    border-bottom: 0.5px solid rgba(0, 0, 0, 0.08);
    padding: 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

.tool-header-inner {
    max-width: 1400px;
    margin: 0 auto;
    padding: 16px 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
}

.tool-logo {
    display: flex;
    align-items: center;
}

.tool-logo-img {
    height: 32px;
    width: auto;
}

.tool-page-title-link {
    flex: 1;
    text-align: center;
    text-decoration: none;
    transition: opacity 0.2s ease;
}

.tool-page-title-link:hover {
    opacity: 0.8;
}

.tool-page-title {
    font-size: 18px;
    font-weight: 700;
    color: #1d1d1f;
    margin: 0;
    letter-spacing: -0.5px;
    position: relative;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.tool-page-title::before {
    content: '✦';
    font-size: 14px;
    color: #6d55fe;
    opacity: 0.6;
}

.tool-page-title::after {
    content: '✦';
    font-size: 14px;
    color: #6d55fe;
    opacity: 0.6;
}

.tool-back-btn {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 8px 16px;
    background: rgba(109, 85, 254, 0.08);
    color: #6d55fe;
    text-decoration: none;
    border-radius: 20px;
    font-size: 14px;
    font-weight: 500;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

.tool-back-btn:hover {
    background: rgba(109, 85, 254, 0.15);
    transform: scale(0.98);
}

/* 底部 */
.tool-footer {
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    border-top: 0.5px solid rgba(0, 0, 0, 0.08);
    padding: 0;
    margin-top: auto;
}

.tool-footer-inner {
    max-width: 1400px;
    margin: 0 auto;
    padding: 24px 20px;
    text-align: center;
}

.tool-copyright {
    font-size: 13px;
    color: #8E8E93;
    margin: 0;
}

.tool-copyright a {
    color: #6d55fe;
    text-decoration: none;
    margin: 0 8px;
    transition: opacity 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

.tool-copyright a:hover {
    opacity: 0.7;
}

/* 响应式 - 顶部底部 */
@media (max-width: 768px) {
    .tool-header-inner {
        padding: 12px 16px;
        gap: 12px;
    }
    
    .tool-logo-img {
        height: 28px;
    }
    
    .tool-page-title {
        font-size: 16px;
        gap: 6px;
    }
    
    .tool-page-title::before,
    .tool-page-title::after {
        font-size: 12px;
    }
    
    .tool-back-btn {
        padding: 6px 12px;
    }
    
    .tool-back-btn span {
        display: none;
    }
    
    .tool-footer-inner {
        padding: 20px 16px;
    }
}

/* ========================================
   BMI计算器专用样式
   ======================================== */

:root {
    --brand-purple: #6d55fe;
    --brand-purple-light: #8572ff;
    --brand-purple-dark: #5a45d8;
    --apple-gray: #8E8E93;
    --apple-light-gray: #F2F2F7;
    --apple-border: rgba(0, 0, 0, 0.08);
    --apple-shadow: rgba(109, 85, 254, 0.08);
    --bmi-underweight: #5dade2;
    --bmi-normal: #48c774;
    --bmi-overweight: #ffb142;
    --bmi-obese: #ff6b6b;
}

/* 主内容区 */
.bmi-main {
    min-height: calc(100vh - 120px);
}

.bmi-section {
    padding: 24px 0 40px;
    background: linear-gradient(180deg, #fafafa 0%, #f5f5f7 100%);
}

.bmi-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 20px;
}

/* BMI计算器区 - 深色主题核心功能突出设计 */
.bmi-calculator {
    background: linear-gradient(135deg, 
        #2a2440 0%, 
        #1f1a35 50%,
        #2a2440 100%);
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    border-radius: 20px;
    padding: 28px;
    margin-bottom: 24px;
    border: 2px solid rgba(109, 85, 254, 0.4);
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.3), 
                0 0 0 1px rgba(109, 85, 254, 0.2) inset,
                0 4px 8px rgba(0, 0, 0, 0.2),
                0 0 60px rgba(109, 85, 254, 0.15);
    position: relative;
    overflow: hidden;
}

.bmi-calculator::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, 
        transparent 0%, 
        rgba(109, 85, 254, 0.6) 50%, 
        transparent 100%);
}

.bmi-calculator::after {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(109, 85, 254, 0.12) 0%, transparent 70%);
    pointer-events: none;
}

.bmi-calculator-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 20px;
    flex-wrap: wrap;
    gap: 12px;
}

.bmi-calculator-title {
    font-size: 17px;
    font-weight: 700;
    color: #fff;
    margin: 0;
    letter-spacing: -0.022em;
    padding-left: 20px;
    position: relative;
    text-shadow: 0 2px 8px rgba(109, 85, 254, 0.5);
}

.bmi-calculator-title::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 5px;
    height: 24px;
    background: linear-gradient(180deg, var(--brand-purple-light) 0%, var(--brand-purple) 100%);
    border-radius: 3px;
    box-shadow: 0 0 16px rgba(109, 85, 254, 0.8), 
                0 0 32px rgba(109, 85, 254, 0.4),
                0 2px 8px rgba(109, 85, 254, 0.6);
}

/* 单位切换 */
.bmi-unit-switch {
    display: flex;
    gap: 4px;
    background: rgba(0, 0, 0, 0.3);
    padding: 4px;
    border-radius: 12px;
    border: 1px solid rgba(109, 85, 254, 0.3);
}

.unit-btn {
    padding: 6px 16px;
    background: transparent;
    border: none;
    border-radius: 8px;
    color: rgba(255, 255, 255, 0.6);
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

.unit-btn.active {
    background: linear-gradient(135deg, var(--brand-purple) 0%, var(--brand-purple-light) 100%);
    color: #fff;
    box-shadow: 0 2px 8px rgba(109, 85, 254, 0.4);
}

.unit-btn:hover:not(.active) {
    color: rgba(255, 255, 255, 0.9);
    background: rgba(255, 255, 255, 0.1);
}

/* 输入区域 */
.bmi-input-area {
    position: relative;
    z-index: 1;
}

.bmi-input-group {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin-bottom: 20px;
}

.bmi-input-item {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.bmi-label {
    font-size: 14px;
    font-weight: 500;
    color: rgba(255, 255, 255, 0.8);
    letter-spacing: -0.022em;
}

.bmi-input {
    padding: 14px 16px;
    font-size: 16px;
    border: 2px solid rgba(109, 85, 254, 0.4);
    border-radius: 12px;
    background: rgba(0, 0, 0, 0.3);
    color: #fff;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3), 
                inset 0 1px 0 rgba(109, 85, 254, 0.2);
    font-weight: 500;
}

.bmi-input:focus {
    outline: none;
    border-color: var(--brand-purple-light);
    background: rgba(0, 0, 0, 0.4);
    box-shadow: 0 0 0 5px rgba(109, 85, 254, 0.3), 
                0 6px 16px rgba(109, 85, 254, 0.3),
                inset 0 1px 0 rgba(109, 85, 254, 0.3);
    transform: translateY(-2px);
}

.bmi-input::placeholder {
    color: rgba(255, 255, 255, 0.4);
}

.bmi-input-split {
    display: flex;
    gap: 8px;
}

.bmi-input-split .bmi-input {
    flex: 1;
}

/* 计算按钮 */
.bmi-calculate-btn {
    width: 100%;
    padding: 14px 24px;
    background: linear-gradient(135deg, var(--brand-purple) 0%, var(--brand-purple-light) 100%);
    border: none;
    border-radius: 14px;
    color: #fff;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 6px 20px rgba(109, 85, 254, 0.4);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    letter-spacing: -0.022em;
}

.bmi-calculate-btn:hover {
    background: linear-gradient(135deg, var(--brand-purple-light) 0%, #9d8dff 100%);
    box-shadow: 0 8px 24px rgba(109, 85, 254, 0.5);
    transform: translateY(-2px);
}

.bmi-calculate-btn:active {
    transform: translateY(0) scale(0.98);
}

.bmi-calculate-btn.calculating {
    pointer-events: none;
}

.bmi-calculate-btn.calculating svg {
    animation: pulse 1s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.2); }
}

/* BMI结果显示区 */
.bmi-result {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    border-radius: 16px;
    padding: 24px;
    margin-bottom: 24px;
    border: 0.5px solid var(--apple-border);
    box-shadow: 0 4px 16px var(--apple-shadow);
}

.bmi-result.hidden {
    display: none;
}

.bmi-result-main {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
    margin-bottom: 24px;
    padding-bottom: 20px;
    border-bottom: 1px solid rgba(109, 85, 254, 0.1);
}

.bmi-result-value {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.bmi-value-label {
    font-size: 14px;
    color: var(--apple-gray);
    font-weight: 500;
}

.bmi-value-number {
    font-size: 48px;
    font-weight: 700;
    color: var(--brand-purple);
    line-height: 1;
    letter-spacing: -0.02em;
    transition: all 0.3s ease;
}

.bmi-result-status {
    display: flex;
    flex-direction: column;
    gap: 8px;
    align-items: flex-end;
    text-align: right;
}

.bmi-status-badge {
    padding: 8px 20px;
    border-radius: 20px;
    font-size: 15px;
    font-weight: 600;
    color: #fff;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    transition: all 0.3s ease;
}

.bmi-status-text {
    font-size: 13px;
    color: #1d1d1f;
    transition: all 0.3s ease;
}

/* BMI指示条 */
.bmi-indicator {
    margin-bottom: 20px;
}

.bmi-indicator-bar {
    height: 12px;
    background: linear-gradient(to right, 
        var(--bmi-underweight) 0%, 
        var(--bmi-underweight) 25%, 
        var(--bmi-normal) 25%, 
        var(--bmi-normal) 50%, 
        var(--bmi-overweight) 50%, 
        var(--bmi-overweight) 75%, 
        var(--bmi-obese) 75%, 
        var(--bmi-obese) 100%);
    border-radius: 6px;
    position: relative;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    margin-bottom: 8px;
}

.bmi-indicator-marker {
    position: absolute;
    top: 50%;
    transform: translate(-50%, -50%);
    width: 20px;
    height: 20px;
    background: #fff;
    border: 2px solid var(--brand-purple);
    border-radius: 50%;
    box-shadow: 0 3px 12px rgba(109, 85, 254, 0.4), 
                0 0 0 4px rgba(109, 85, 254, 0.15);
    transition: left 0.8s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 2;
}

/* 指示器出现时的脉冲动画 */
.bmi-indicator-marker.animate {
    animation: markerPulse 0.5s ease;
}

@keyframes markerPulse {
    0%, 100% {
        transform: translate(-50%, -50%) scale(1);
    }
    50% {
        transform: translate(-50%, -50%) scale(1.3);
    }
}

.bmi-indicator-labels {
    display: flex;
    justify-content: space-between;
    padding: 0 4px;
}

.bmi-indicator-labels span {
    font-size: 12px;
    color: var(--apple-gray);
    font-weight: 500;
}

/* 详细信息 */
.bmi-details {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}

.bmi-detail-item {
    display: flex;
    flex-direction: column;
    gap: 4px;
    padding: 12px;
    background: rgba(109, 85, 254, 0.05);
    border-radius: 10px;
    border: 1px solid rgba(109, 85, 254, 0.1);
}

.detail-label {
    font-size: 12px;
    color: var(--apple-gray);
}

.detail-value {
    font-size: 15px;
    font-weight: 600;
    color: #1d1d1f;
}

/* 两列布局 */
.bmi-two-columns {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin-bottom: 16px;
}

/* 初始状态下，如果只有参考区域，让它占满整行 */
.bmi-two-columns:has(.bmi-advice.hidden) {
    grid-template-columns: 1fr;
}

.bmi-two-columns:has(.bmi-advice.hidden) .bmi-reference {
    max-width: 100%;
}

/* 健康建议 */
.bmi-advice {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    border-radius: 16px;
    padding: 20px;
    border: 0.5px solid var(--apple-border);
    box-shadow: 0 4px 16px var(--apple-shadow);
    isolation: isolate;
    -webkit-transform: translateZ(0);
    transform: translateZ(0);
}

.bmi-advice.hidden {
    display: none;
}

.bmi-advice-title {
    font-size: 15px;
    font-weight: 600;
    color: #1d1d1f;
    margin: 0 0 16px;
    letter-spacing: -0.022em;
    padding-left: 12px;
    position: relative;
}

.bmi-advice-title::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 3px;
    height: 16px;
    background: linear-gradient(180deg, var(--brand-purple) 0%, var(--brand-purple-light) 100%);
    border-radius: 2px;
}

.bmi-advice-content {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.advice-item {
    position: relative;
    padding: 16px 18px;
    background: #fff;
    border-radius: 12px;
    border: 1px solid rgba(0, 0, 0, 0.06);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04);
}

.advice-item:hover {
    transform: translateX(4px);
    box-shadow: 0 4px 16px rgba(109, 85, 254, 0.12);
    border-color: rgba(109, 85, 254, 0.15);
}

.advice-item-title {
    font-size: 14px;
    font-weight: 600;
    color: #1d1d1f;
    margin-bottom: 6px;
    letter-spacing: -0.022em;
    position: relative;
    padding-left: 14px;
}

.advice-item-title::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--brand-purple) 0%, var(--brand-purple-light) 100%);
    box-shadow: 0 0 0 3px rgba(109, 85, 254, 0.1);
}

.advice-item-text {
    font-size: 13px;
    color: #6e6e73;
    line-height: 1.6;
    padding-left: 14px;
}

/* BMI标准参考 */
.bmi-reference {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    border-radius: 16px;
    padding: 20px;
    border: 0.5px solid var(--apple-border);
    box-shadow: 0 4px 16px var(--apple-shadow);
    isolation: isolate;
    -webkit-transform: translateZ(0);
    transform: translateZ(0);
}

.bmi-reference-title {
    font-size: 15px;
    font-weight: 600;
    color: #1d1d1f;
    margin: 0 0 16px;
    letter-spacing: -0.022em;
    padding-left: 12px;
    position: relative;
}

.bmi-reference-title::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 3px;
    height: 16px;
    background: linear-gradient(180deg, var(--brand-purple) 0%, var(--brand-purple-light) 100%);
    border-radius: 2px;
}

.bmi-reference-table {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
}

.bmi-ref-item {
    position: relative;
    padding: 18px 16px;
    border-radius: 14px;
    background: #fff;
    border: 1px solid rgba(0, 0, 0, 0.06);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04);
}

.bmi-ref-item:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

.bmi-ref-item.underweight:hover {
    box-shadow: 0 4px 12px rgba(93, 173, 226, 0.15);
    border-color: rgba(93, 173, 226, 0.2);
}

.bmi-ref-item.normal:hover {
    box-shadow: 0 4px 12px rgba(72, 199, 116, 0.15);
    border-color: rgba(72, 199, 116, 0.2);
}

.bmi-ref-item.overweight:hover {
    box-shadow: 0 4px 12px rgba(255, 177, 66, 0.15);
    border-color: rgba(255, 177, 66, 0.2);
}

.bmi-ref-item.obese:hover {
    box-shadow: 0 4px 12px rgba(255, 107, 107, 0.15);
    border-color: rgba(255, 107, 107, 0.2);
}

.ref-range {
    font-size: 22px;
    font-weight: 700;
    color: #1d1d1f;
    margin-bottom: 8px;
    letter-spacing: -0.03em;
}

.ref-label {
    font-size: 13px;
    font-weight: 600;
    margin-bottom: 8px;
    display: inline-block;
    padding: 5px 14px;
    border-radius: 20px;
}

.bmi-ref-item.underweight .ref-label {
    color: #fff;
    background: linear-gradient(135deg, #5dade2 0%, #85c1e9 100%);
    box-shadow: 0 2px 6px rgba(93, 173, 226, 0.25);
}

.bmi-ref-item.normal .ref-label {
    color: #fff;
    background: linear-gradient(135deg, #48c774 0%, #6dd592 100%);
    box-shadow: 0 2px 6px rgba(72, 199, 116, 0.25);
}

.bmi-ref-item.overweight .ref-label {
    color: #fff;
    background: linear-gradient(135deg, #ffb142 0%, #ffc56e 100%);
    box-shadow: 0 2px 6px rgba(255, 177, 66, 0.25);
}

.bmi-ref-item.obese .ref-label {
    color: #fff;
    background: linear-gradient(135deg, #ff6b6b 0%, #ff8787 100%);
    box-shadow: 0 2px 6px rgba(255, 107, 107, 0.25);
}

.ref-desc {
    font-size: 12px;
    color: #6e6e73;
    line-height: 1.5;
}

/* 测量方法 */
.bmi-measurement {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    border-radius: 16px;
    padding: 20px;
    margin-bottom: 16px;
    border: 0.5px solid var(--apple-border);
    box-shadow: 0 4px 16px var(--apple-shadow);
    isolation: isolate;
    -webkit-transform: translateZ(0);
    transform: translateZ(0);
}

.measurement-title {
    font-size: 15px;
    font-weight: 600;
    color: #1d1d1f;
    margin: 0 0 20px;
    letter-spacing: -0.022em;
    padding-left: 12px;
    position: relative;
}

.measurement-title::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 3px;
    height: 16px;
    background: linear-gradient(180deg, var(--brand-purple) 0%, var(--brand-purple-light) 100%);
    border-radius: 2px;
}

.measurement-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
}

.measurement-item {
    background: #fff;
    border-radius: 12px;
    padding: 20px;
    border: 1px solid rgba(0, 0, 0, 0.06);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04);
}

.measurement-item:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(109, 85, 254, 0.12);
    border-color: rgba(109, 85, 254, 0.15);
}

.measurement-icon {
    font-size: 32px;
    margin-bottom: 12px;
    text-align: center;
}

.measurement-name {
    font-size: 15px;
    font-weight: 600;
    color: #1d1d1f;
    margin: 0 0 12px;
    text-align: center;
    letter-spacing: -0.022em;
}

.measurement-steps {
    list-style: none;
    padding: 0;
    margin: 0;
}

.measurement-steps li {
    position: relative;
    padding-left: 20px;
    font-size: 13px;
    line-height: 1.6;
    color: #6e6e73;
    margin-bottom: 8px;
}

.measurement-steps li:last-child {
    margin-bottom: 0;
}

.measurement-steps li::before {
    content: '•';
    position: absolute;
    left: 6px;
    color: var(--brand-purple);
    font-weight: 700;
}

/* 功能说明 */
.bmi-tips {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    border-radius: 16px;
    padding: 20px;
    border: 0.5px solid var(--apple-border);
    box-shadow: 0 4px 16px var(--apple-shadow);
    isolation: isolate;
    -webkit-transform: translateZ(0);
    transform: translateZ(0);
}

.tips-title {
    font-size: 15px;
    font-weight: 600;
    color: #1d1d1f;
    margin-bottom: 16px;
    letter-spacing: -0.022em;
    display: flex;
    align-items: center;
    gap: 8px;
    padding-left: 12px;
    position: relative;
}

.tips-title::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 3px;
    height: 16px;
    background: linear-gradient(180deg, var(--brand-purple) 0%, var(--brand-purple-light) 100%);
    border-radius: 2px;
}

.tips-title::after {
    content: '💪';
    font-size: 18px;
    margin-left: auto;
}

.tips-list {
    list-style: none;
    padding: 0;
    margin: 0;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 10px;
}

.tips-list li {
    position: relative;
    padding: 12px 12px 12px 38px;
    font-size: 13px;
    line-height: 1.5;
    color: #1d1d1f;
    background: rgba(109, 85, 254, 0.02);
    border-radius: 10px;
    border: 1px solid rgba(109, 85, 254, 0.08);
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

.tips-list li:hover {
    background: rgba(109, 85, 254, 0.05);
    border-color: rgba(109, 85, 254, 0.15);
    transform: translateY(-1px);
    box-shadow: 0 2px 8px rgba(109, 85, 254, 0.08);
}

.tips-list li::before {
    content: '✓';
    position: absolute;
    left: 10px;
    top: 12px;
    width: 18px;
    height: 18px;
    background: linear-gradient(135deg, var(--brand-purple) 0%, var(--brand-purple-light) 100%);
    border-radius: 50%;
    color: #fff;
    font-size: 11px;
    font-weight: 600;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 2px 6px rgba(109, 85, 254, 0.3);
}

.tips-list li strong {
    color: var(--brand-purple);
    font-weight: 600;
    display: block;
    margin-bottom: 2px;
}

/* 动画 */
@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

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

@keyframes markerPulse {
    0%, 100% {
        transform: translate(-50%, -50%) scale(1);
    }
    50% {
        transform: translate(-50%, -50%) scale(1.2);
    }
}

/* 结果区域整体动画 */
.bmi-result {
    animation: fadeInUp 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

/* 结果内部元素依次出现 */
.bmi-result-main {
    animation: fadeIn 0.4s ease 0.2s both;
}

.bmi-indicator {
    animation: fadeIn 0.4s ease 0.3s both;
}

.bmi-details {
    animation: fadeIn 0.4s ease 0.4s both;
}

/* 两列区域同时淡入 */
.bmi-advice {
    animation: fadeInUp 0.5s cubic-bezier(0.4, 0, 0.2, 1) 0.3s both;
    will-change: transform, opacity;
    transform: translateZ(0);
}

.bmi-reference {
    animation: fadeInUp 0.5s cubic-bezier(0.4, 0, 0.2, 1) 0.3s both;
    will-change: transform, opacity;
    transform: translateZ(0);
}

/* 建议卡片依次出现 */
.advice-item {
    animation: fadeInUp 0.4s cubic-bezier(0.4, 0, 0.2, 1) both;
    will-change: transform, opacity;
}

.advice-item:nth-child(1) {
    animation-delay: 0.5s;
}

.advice-item:nth-child(2) {
    animation-delay: 0.6s;
}

.advice-item:nth-child(3) {
    animation-delay: 0.7s;
}

/* 参考卡片依次出现 */
.bmi-ref-item {
    animation: fadeInUp 0.4s cubic-bezier(0.4, 0, 0.2, 1) both;
    will-change: transform, opacity;
}

.bmi-ref-item:nth-child(1) {
    animation-delay: 0.5s;
}

.bmi-ref-item:nth-child(2) {
    animation-delay: 0.55s;
}

.bmi-ref-item:nth-child(3) {
    animation-delay: 0.6s;
}

.bmi-ref-item:nth-child(4) {
    animation-delay: 0.65s;
}

/* 响应式 */
@media (max-width: 768px) {
    .bmi-section {
        padding: 16px 0 32px;
    }
    
    .bmi-container {
        padding: 0 16px;
    }
    
    .bmi-calculator, .bmi-result, .bmi-advice, .bmi-reference, .bmi-measurement, .bmi-tips {
        padding: 16px;
        border-radius: 14px;
    }
    
    .bmi-calculator-header {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .bmi-input-group {
        grid-template-columns: 1fr;
    }
    
    .bmi-result-main {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .bmi-result-status {
        align-items: flex-start;
        text-align: left;
    }
    
    .bmi-value-number {
        font-size: 40px;
    }
    
    .bmi-details {
        grid-template-columns: 1fr;
    }
    
    .bmi-two-columns {
        grid-template-columns: 1fr;
    }
    
    .bmi-reference-table {
        grid-template-columns: 1fr;
    }
    
    .tips-list {
        grid-template-columns: 1fr;
    }
    
    .measurement-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .bmi-value-number {
        font-size: 36px;
    }
    
    .bmi-indicator-labels span {
        font-size: 11px;
    }
}