/* 基础样式重置与变量定义 - 匹配SolutionMall风格 */
:root {
    --primary-color: #0F62FE;
    --primary-light: #4589FF;
    --primary-lighter: #A6C8FF;
    --primary-lightest: #E8F4FD;
    --hero-bg: #E8F4FD;
    --secondary-color: #393939;
    --text-color: #161616;
    --text-light: #525252;
    --text-lighter: #8D8D8D;
    --bg-color: #FFFFFF;
    --sidebar-bg: #FFFFFF;
    --white: #FFFFFF;
    --success: #24A148;
    --warning: #F1C21B;
    --danger: #DA1E28;
    --info: #0043CE;
    --sidebar-width: 220px;
    --border-color: #E0E0E0;
    --border-radius: 8px;
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 4px 16px rgba(0, 0, 0, 0.12);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
}

/* 侧边导航栏 - 白色背景风格 */
.sidebar {
    position: fixed;
    left: 0;
    top: 0;
    width: var(--sidebar-width);
    height: 100vh;
    background: var(--sidebar-bg);
    color: var(--text-color);
    display: flex;
    flex-direction: column;
    z-index: 1000;
    overflow-y: auto;
    border-right: 1px solid var(--border-color);
}

.logo-section {
    padding: 20px 16px;
    border-bottom: 1px solid var(--border-color);
    text-align: center;
}

.logo {
    max-width: 160px;
    height: auto;
    margin-bottom: 8px;
}

.website-link {
    display: block;
    color: var(--primary-color);
    font-family: Arial, sans-serif;
    font-size: 12px;
    text-decoration: none;
    transition: color 0.3s;
}

.website-link:hover {
    color: var(--primary-light);
    text-decoration: underline;
}

.nav-menu {
    list-style: none;
    padding: 12px 0;
    flex: 1;
}

.nav-item {
    margin: 2px 8px;
}

.nav-item a {
    display: flex;
    align-items: center;
    padding: 10px 12px;
    color: var(--text-color);
    text-decoration: none;
    border-radius: 6px;
    transition: all 0.3s;
    font-size: 13px;
    position: relative;
}

.nav-item a i {
    width: 18px;
    margin-right: 10px;
    font-size: 14px;
    color: var(--primary-color);
}

.nav-item a::after {
    content: '›';
    position: absolute;
    right: 12px;
    color: var(--text-lighter);
    font-size: 16px;
    transition: transform 0.3s;
}

.nav-item a:hover {
    background: var(--primary-lightest);
    color: var(--primary-color);
}

.nav-item a:hover::after {
    transform: translateX(3px);
}

.nav-item.active a {
    background: var(--primary-lightest);
    color: var(--primary-color);
    font-weight: 500;
}

.sidebar-footer {
    padding: 16px;
    border-top: 1px solid var(--border-color);
    font-size: 11px;
    color: var(--text-lighter);
    text-align: center;
}

/* 主内容区 */
.main-content {
    margin-left: var(--sidebar-width);
    min-height: 100vh;
    background: var(--bg-color);
}

.section {
    display: none;
    animation: fadeIn 0.3s ease;
}

.section.active {
    display: block;
}

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

/* Hero区域 - 浅蓝色背景 */
.hero-section {
    background: var(--hero-bg);
    color: var(--text-color);
    padding: 60px 48px;
    text-align: left;
}

.hero-badge {
    display: inline-block;
    background: var(--primary-color);
    color: var(--white);
    padding: 4px 12px;
    border-radius: 4px;
    font-size: 12px;
    margin-bottom: 20px;
}

.hero-section h1 {
    font-size: 36px;
    font-weight: 700;
    margin-bottom: 16px;
    color: var(--text-color);
    line-height: 1.3;
}

.hero-subtitle {
    font-size: 16px;
    max-width: 700px;
    margin-bottom: 28px;
    line-height: 1.8;
    color: var(--text-light);
}

.hero-buttons {
    display: flex;
    gap: 12px;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    border-radius: 6px;
    font-size: 14px;
    font-weight: 500;
    text-decoration: none;
    transition: all 0.3s;
    cursor: pointer;
}

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

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

.btn-outline {
    background: var(--white);
    color: var(--text-color);
    border: 1px solid var(--border-color);
}

.btn-outline:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

/* 内容区域 */
.content-section {
    padding: 40px 48px;
    max-width: 1200px;
    background: var(--white);
}

.content-section h2 {
    font-size: 22px;
    color: var(--text-color);
    margin: 36px 0 16px;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--primary-color);
}

.content-section h2:first-child {
    margin-top: 0;
}

.content-section p {
    color: var(--text-light);
    margin-bottom: 16px;
    line-height: 1.8;
    font-size: 15px;
}

/* 章节头部 - 浅蓝色背景 */
.chapter-header {
    background: var(--hero-bg);
    color: var(--text-color);
    padding: 40px 48px;
}

.chapter-badge {
    display: inline-block;
    background: var(--primary-color);
    color: var(--white);
    padding: 4px 12px;
    border-radius: 4px;
    font-size: 12px;
    margin-bottom: 12px;
}

.chapter-header h1 {
    font-size: 32px;
    margin-bottom: 10px;
    color: var(--text-color);
}

.chapter-header p {
    font-size: 15px;
    color: var(--text-light);
}

/* 架构区域 */
.architecture-section {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 32px;
    align-items: start;
    margin: 24px 0;
}

.arch-text {
    padding-right: 16px;
}

.layer-item {
    display: flex;
    align-items: flex-start;
    margin-bottom: 14px;
    padding: 10px 12px;
    background: var(--primary-lightest);
    border-radius: 6px;
    border-left: 3px solid var(--primary-color);
}

.layer-badge {
    background: var(--primary-color);
    color: var(--white);
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 11px;
    font-weight: 600;
    margin-right: 10px;
    flex-shrink: 0;
}

.arch-image img {
    width: 100%;
    border-radius: 8px;
    box-shadow: var(--shadow);
}

/* 功能卡片网格 */
.features-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    margin: 24px 0;
}

.feature-card {
    background: var(--white);
    padding: 24px 20px;
    border-radius: 8px;
    text-align: center;
    border: 1px solid var(--border-color);
    transition: all 0.3s;
}

.feature-card:hover {
    border-color: var(--primary-color);
    box-shadow: var(--shadow);
}

.feature-card i {
    font-size: 32px;
    color: var(--primary-color);
    margin-bottom: 14px;
}

.feature-card h3 {
    font-size: 16px;
    margin-bottom: 10px;
    color: var(--text-color);
}

.feature-card p {
    font-size: 13px;
    color: var(--text-light);
    margin: 0;
}

/* 章节导航网格 - 虚线边框样式 */
.chapter-nav-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 14px;
    margin: 24px 0;
}

.chapter-nav-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 14px 16px;
    background: var(--white);
    color: var(--text-color);
    border: 2px dashed var(--primary-lighter);
    border-radius: 8px;
    text-decoration: none;
    font-size: 13px;
    font-weight: 500;
    transition: all 0.3s;
}

.chapter-nav-btn i {
    color: var(--primary-color);
    font-size: 16px;
}

.chapter-nav-btn:hover {
    background: var(--primary-lightest);
    border-color: var(--primary-color);
    border-style: solid;
    color: var(--primary-color);
}

/* 图片展示 */
.image-showcase {
    margin: 24px 0;
    text-align: center;
}

.image-showcase img {
    max-width: 100%;
    border-radius: 8px;
    box-shadow: var(--shadow);
}

.image-caption {
    font-size: 13px;
    color: var(--text-lighter);
    margin-top: 10px;
}

/* 组件卡片网格 */
.component-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    margin: 24px 0;
}

.component-card {
    background: var(--white);
    border-radius: 8px;
    overflow: hidden;
    border: 1px solid var(--border-color);
    transition: all 0.3s;
}

.component-card:hover {
    border-color: var(--primary-color);
    box-shadow: var(--shadow);
}

.component-card img {
    width: 100%;
    height: 160px;
    object-fit: cover;
}

.component-card h3 {
    font-size: 15px;
    padding: 14px 14px 6px;
    color: var(--text-color);
}

.component-card p {
    font-size: 12px;
    padding: 0 14px 14px;
    color: var(--text-light);
    margin: 0;
}

/* 工作流程 */
.workflow-section {
    margin: 24px 0;
}

.workflow-step {
    display: flex;
    align-items: flex-start;
    margin-bottom: 20px;
    padding: 18px;
    background: var(--white);
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.step-number {
    width: 36px;
    height: 36px;
    background: var(--primary-color);
    color: var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 16px;
    flex-shrink: 0;
    margin-right: 16px;
}

.step-content h4 {
    font-size: 16px;
    color: var(--text-color);
    margin-bottom: 6px;
}

.step-content p {
    margin: 0;
    color: var(--text-light);
    font-size: 14px;
}

/* 设计原则网格 */
.principles-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    margin: 24px 0;
}

.principle-card {
    background: var(--white);
    padding: 20px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    text-align: center;
}

.principle-icon {
    width: 52px;
    height: 52px;
    background: var(--primary-lightest);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 14px;
}

.principle-icon i {
    font-size: 22px;
    color: var(--primary-color);
}

.principle-card h3 {
    font-size: 15px;
    margin-bottom: 10px;
}

.principle-card p {
    font-size: 13px;
    color: var(--text-light);
    margin: 0;
}

/* 逻辑流程 */
.logic-flow {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin: 24px 0;
    flex-wrap: wrap;
    gap: 14px;
}

.logic-item {
    flex: 1;
    min-width: 180px;
    background: var(--white);
    padding: 18px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    text-align: center;
}

.logic-step {
    display: inline-block;
    background: var(--primary-color);
    color: var(--white);
    padding: 3px 10px;
    border-radius: 10px;
    font-size: 11px;
    margin-bottom: 10px;
}

.logic-item h4 {
    font-size: 15px;
    margin-bottom: 6px;
}

.logic-item p {
    font-size: 12px;
    color: var(--text-light);
    margin: 0;
}

.logic-arrow {
    color: var(--primary-color);
    font-size: 20px;
}

/* 数据表格 */
.data-table {
    width: 100%;
    border-collapse: collapse;
    margin: 24px 0;
    background: var(--white);
    border-radius: 8px;
    overflow: hidden;
    border: 1px solid var(--border-color);
}

.data-table th,
.data-table td {
    padding: 12px 14px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.data-table th {
    background: var(--primary-lightest);
    color: var(--text-color);
    font-weight: 600;
    font-size: 13px;
}

.data-table td {
    font-size: 13px;
    color: var(--text-light);
}

.data-table tr:last-child td {
    border-bottom: none;
}

.data-table tr:hover td {
    background: #FAFAFA;
}

/* 场景卡片 */
.scenario-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
    margin: 24px 0;
}

.scenario-card {
    background: var(--white);
    border-radius: 8px;
    overflow: hidden;
    border: 1px solid var(--border-color);
}

.scenario-header {
    background: var(--primary-lightest);
    color: var(--text-color);
    padding: 16px 18px;
    display: flex;
    align-items: center;
    gap: 10px;
    border-bottom: 1px solid var(--border-color);
}

.scenario-header i {
    font-size: 20px;
    color: var(--primary-color);
}

.scenario-header h3 {
    font-size: 16px;
    margin: 0;
}

.scenario-content {
    padding: 18px;
}

.scenario-content h4 {
    font-size: 13px;
    color: var(--primary-color);
    margin: 14px 0 6px;
}

.scenario-content h4:first-child {
    margin-top: 0;
}

.scenario-content p {
    font-size: 13px;
    margin: 0;
}

/* 技术分析卡片 */
.tech-analysis {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin: 24px 0;
}

.tech-card {
    background: var(--white);
    padding: 20px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.tech-card h3 {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 16px;
    color: var(--primary-color);
    margin-bottom: 14px;
}

.tech-card p {
    font-size: 13px;
    margin-bottom: 10px;
}

.tech-card p:last-child {
    margin-bottom: 0;
}

/* 接口网格 */
.interface-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    margin: 24px 0;
}

.interface-card {
    background: var(--white);
    border-radius: 8px;
    overflow: hidden;
    border: 1px solid var(--border-color);
}

.interface-card img {
    width: 100%;
    height: 140px;
    object-fit: cover;
}

.interface-card h3 {
    font-size: 14px;
    padding: 14px 14px 6px;
}

.interface-card p {
    font-size: 12px;
    padding: 0 14px 14px;
    margin: 0;
}

/* 连接图 */
.connection-diagram {
    margin: 24px 0;
    text-align: center;
}

.connection-diagram img {
    max-width: 100%;
    border-radius: 8px;
    box-shadow: var(--shadow);
}

/* 接线卡片 */
.wiring-section {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin: 24px 0;
}

.wiring-card {
    background: var(--white);
    border-radius: 8px;
    overflow: hidden;
    border: 1px solid var(--border-color);
}

.wiring-card h3 {
    background: var(--primary-lightest);
    color: var(--text-color);
    padding: 12px 16px;
    font-size: 15px;
    border-bottom: 1px solid var(--border-color);
}

.wiring-content {
    padding: 16px;
}

.wiring-content p {
    font-size: 13px;
    margin-bottom: 8px;
}

.wiring-content p:last-child {
    margin-bottom: 0;
}

/* 风险类别 */
.risk-category-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin: 24px 0;
}

.risk-category {
    background: var(--white);
    padding: 20px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.risk-icon {
    width: 44px;
    height: 44px;
    background: var(--primary-lightest);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 14px;
}

.risk-icon i {
    font-size: 20px;
    color: var(--primary-color);
}

.risk-category h3 {
    font-size: 16px;
    margin-bottom: 14px;
}

.risk-category ul {
    list-style: none;
    padding: 0;
}

.risk-category li {
    font-size: 13px;
    color: var(--text-light);
    padding: 6px 0;
    border-bottom: 1px solid var(--border-color);
}

.risk-category li:last-child {
    border-bottom: none;
}

/* 风险矩阵 */
.risk-matrix {
    background: var(--white);
    padding: 20px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    margin: 24px 0;
}

.risk-matrix h3 {
    font-size: 16px;
    margin-bottom: 14px;
}

.risk-low { background: #24A148; color: white; }
.risk-medium { background: #F1C21B; color: #161616; }
.risk-high { background: #FF832B; color: white; }
.risk-critical { background: #DA1E28; color: white; }

.risk-table td.risk-low,
.risk-table td.risk-medium,
.risk-table td.risk-high,
.risk-table td.risk-critical {
    font-weight: 600;
    text-align: center;
}

.risk-legend {
    display: flex;
    gap: 20px;
    margin-top: 14px;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 12px;
}

.legend-color {
    width: 14px;
    height: 14px;
    border-radius: 3px;
}

/* 策略网格 */
.strategy-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    margin: 24px 0;
}

.strategy-card {
    background: var(--white);
    border-radius: 8px;
    overflow: hidden;
    border: 1px solid var(--border-color);
}

.strategy-header {
    padding: 14px 16px;
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--white);
}

.strategy-header.avoid { background: #DA1E28; }
.strategy-header.mitigate { background: #0F62FE; }
.strategy-header.transfer { background: #FF832B; }
.strategy-header.accept { background: #24A148; }

.strategy-header i {
    font-size: 18px;
}

.strategy-header h3 {
    font-size: 15px;
    margin: 0;
}

.strategy-card p {
    padding: 14px 16px;
    font-size: 13px;
    margin: 0;
}

/* 应急措施 */
.emergency-section {
    margin: 24px 0;
}

.emergency-item {
    background: var(--white);
    padding: 18px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    margin-bottom: 14px;
    border-left: 3px solid var(--primary-color);
}

.emergency-item h3 {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 15px;
    color: var(--primary-color);
    margin-bottom: 10px;
}

.emergency-item p {
    margin: 0;
    font-size: 13px;
}

/* 配套系统网格 */
.support-system-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    margin: 24px 0;
}

.support-card {
    background: var(--white);
    border-radius: 8px;
    overflow: hidden;
    border: 1px solid var(--border-color);
}

.support-card img {
    width: 100%;
    height: 140px;
    object-fit: cover;
}

.support-card h3 {
    font-size: 14px;
    padding: 14px 14px 6px;
}

.support-card p {
    font-size: 12px;
    padding: 0 14px 14px;
    margin: 0;
}

/* 样式列表 */
.styled-list {
    list-style: none;
    padding: 0;
    margin: 16px 0;
}

.styled-list li {
    padding: 10px 14px;
    background: var(--white);
    margin-bottom: 6px;
    border-radius: 6px;
    border: 1px solid var(--border-color);
    font-size: 13px;
}

/* 工具网格 */
.tools-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    margin: 24px 0;
}

.tool-card {
    background: var(--white);
    border-radius: 8px;
    overflow: hidden;
    border: 1px solid var(--border-color);
}

.tool-card img {
    width: 100%;
    height: 140px;
    object-fit: cover;
}

.tool-card h3 {
    font-size: 14px;
    padding: 14px 14px 6px;
}

.tool-card p {
    font-size: 12px;
    padding: 0 14px 14px;
    margin: 0;
}

/* 材料网格 */
.materials-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin: 24px 0;
}

.material-card {
    background: var(--white);
    padding: 20px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    text-align: center;
}

.material-icon {
    width: 52px;
    height: 52px;
    background: var(--primary-lightest);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 14px;
}

.material-icon i {
    font-size: 22px;
    color: var(--primary-color);
}

.material-card h3 {
    font-size: 15px;
    margin-bottom: 10px;
}

.material-card p {
    font-size: 12px;
    margin-bottom: 6px;
    text-align: left;
}

/* 质量网格 */
.quality-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
    margin: 24px 0;
}

.quality-card {
    background: var(--white);
    border-radius: 8px;
    overflow: hidden;
    border: 1px solid var(--border-color);
}

.quality-header {
    background: var(--primary-lightest);
    color: var(--text-color);
    padding: 14px 18px;
    display: flex;
    align-items: center;
    gap: 10px;
    border-bottom: 1px solid var(--border-color);
}

.quality-header i {
    font-size: 18px;
    color: var(--primary-color);
}

.quality-header h3 {
    font-size: 15px;
    margin: 0;
}

.mini-table {
    width: 100%;
    border-collapse: collapse;
}

.mini-table th,
.mini-table td {
    padding: 10px 14px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
    font-size: 12px;
}

.mini-table th {
    background: #FAFAFA;
    font-weight: 500;
}

/* 问题列表 */
.problem-list {
    margin: 24px 0;
}

.problem-item {
    display: flex;
    background: var(--white);
    border-radius: 8px;
    border: 1px solid var(--border-color);
    margin-bottom: 14px;
    overflow: hidden;
}

.problem-icon {
    width: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.problem-icon.danger {
    background: #DA1E28;
    color: white;
}

.problem-icon.warning {
    background: #FF832B;
    color: white;
}

.problem-icon i {
    font-size: 20px;
}

.problem-content {
    padding: 14px 18px;
}

.problem-content h4 {
    font-size: 15px;
    margin-bottom: 6px;
}

.problem-content p {
    font-size: 13px;
    margin: 0;
}

/* 实践网格 */
.practice-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    margin: 24px 0;
}

.practice-card {
    background: var(--white);
    padding: 20px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.practice-card h3 {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 15px;
    color: var(--primary-color);
    margin-bottom: 10px;
}

.practice-card p {
    font-size: 13px;
    margin: 0;
}

/* 计算器网格 */
.calculator-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
    margin: 24px 0;
}

.calculator-card {
    background: var(--white);
    padding: 20px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.calculator-card h2 {
    font-size: 16px;
    color: var(--primary-color);
    margin: 0 0 6px;
    padding: 0;
    border: none;
}

.calculator-card > p {
    font-size: 13px;
    color: var(--text-lighter);
    margin-bottom: 18px;
}

.calc-form {
    display: grid;
    gap: 14px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.form-group label {
    font-size: 12px;
    color: var(--text-light);
    font-weight: 500;
}

.form-group input,
.form-group select {
    padding: 8px 12px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: 13px;
    transition: border-color 0.3s;
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary-color);
}

.calc-btn {
    background: var(--primary-color);
    color: var(--white);
    padding: 10px 20px;
    border: none;
    border-radius: 4px;
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    transition: background 0.3s;
    margin-top: 6px;
}

.calc-btn:hover {
    background: var(--primary-light);
}

.calc-result {
    margin-top: 18px;
    padding: 14px;
    background: var(--primary-lightest);
    border-radius: 6px;
}

.calc-result p {
    font-size: 13px;
    margin: 6px 0;
    color: var(--text-color);
}

.calc-result span {
    font-weight: 600;
    color: var(--primary-color);
}

/* 安装前要求 */
.prereq-section {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin: 24px 0;
}

.prereq-card {
    background: var(--white);
    padding: 20px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.prereq-card h3 {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 15px;
    color: var(--primary-color);
    margin-bottom: 14px;
}

.prereq-card ul {
    list-style: none;
    padding: 0;
}

.prereq-card li {
    font-size: 13px;
    color: var(--text-light);
    padding: 6px 0;
    border-bottom: 1px solid var(--border-color);
    padding-left: 14px;
    position: relative;
}

.prereq-card li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--primary-color);
}

.prereq-card li:last-child {
    border-bottom: none;
}

/* 安装网格 */
.install-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
    margin: 24px 0;
}

.install-card {
    background: var(--white);
    border-radius: 8px;
    overflow: hidden;
    border: 1px solid var(--border-color);
}

.install-card img {
    width: 100%;
    height: 180px;
    object-fit: cover;
}

.install-card h3 {
    font-size: 16px;
    padding: 18px 18px 10px;
}

.install-specs {
    padding: 0 18px 18px;
}

.install-specs p {
    font-size: 13px;
    margin-bottom: 6px;
}

/* 调试步骤 */
.debug-steps {
    margin: 24px 0;
}

.debug-step {
    display: flex;
    background: var(--white);
    border-radius: 8px;
    border: 1px solid var(--border-color);
    margin-bottom: 14px;
    overflow: hidden;
}

.step-num {
    width: 50px;
    background: var(--primary-color);
    color: var(--white);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    font-weight: 700;
    flex-shrink: 0;
}

.step-detail {
    padding: 18px;
}

.step-detail h4 {
    font-size: 15px;
    margin-bottom: 6px;
}

.step-detail p {
    font-size: 13px;
    margin: 0;
}

/* 安全网格 */
.safety-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin: 24px 0;
}

.safety-card {
    background: var(--white);
    padding: 20px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.safety-icon {
    width: 44px;
    height: 44px;
    background: var(--primary-lightest);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 14px;
}

.safety-icon i {
    font-size: 20px;
    color: var(--primary-color);
}

.safety-card h3 {
    font-size: 16px;
    margin-bottom: 14px;
}

.safety-card ul {
    list-style: none;
    padding: 0;
}

.safety-card li {
    font-size: 13px;
    color: var(--text-light);
    padding: 6px 0;
    border-bottom: 1px solid var(--border-color);
}

.safety-card li:last-child {
    border-bottom: none;
}

/* 维护区域 */
.maintenance-section {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
    margin: 24px 0;
}

.maintenance-card {
    background: var(--white);
    padding: 20px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.maintenance-card h3 {
    font-size: 16px;
    color: var(--primary-color);
    margin-bottom: 14px;
}

.maintenance-card ul {
    list-style: none;
    padding: 0;
}

.maintenance-card li {
    font-size: 13px;
    color: var(--text-light);
    padding: 8px 0;
    border-bottom: 1px solid var(--border-color);
}

.maintenance-card li:last-child {
    border-bottom: none;
}

/* 联系区域 */
.contact-section {
    background: var(--primary-lightest);
    color: var(--text-color);
    padding: 32px;
    border-radius: 8px;
    text-align: center;
    margin-top: 36px;
    border: 1px solid var(--primary-lighter);
}

.contact-section h3 {
    font-size: 22px;
    margin-bottom: 10px;
}

.contact-section p {
    color: var(--text-light);
    margin-bottom: 18px;
}

.contact-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: var(--white);
    color: var(--primary-color);
    padding: 12px 24px;
    border-radius: 6px;
    text-decoration: none;
    font-weight: 500;
    font-family: Arial, sans-serif;
    border: 1px solid var(--primary-color);
    transition: all 0.3s;
}

.contact-link:hover {
    background: var(--primary-color);
    color: var(--white);
}

/* 响应式设计 */
@media (max-width: 1400px) {
    .features-grid,
    .component-grid,
    .interface-grid,
    .tools-grid,
    .support-system-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .principles-grid,
    .strategy-grid,
    .practice-grid,
    .chapter-nav-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 1024px) {
    .sidebar {
        width: 200px;
    }
    
    .main-content {
        margin-left: 200px;
    }
    
    .hero-section,
    .chapter-header {
        padding: 36px;
    }
    
    .content-section {
        padding: 28px 36px;
    }
    
    .architecture-section {
        grid-template-columns: 1fr;
    }
    
    .scenario-grid,
    .calculator-grid,
    .quality-grid,
    .install-grid,
    .maintenance-section {
        grid-template-columns: 1fr;
    }
    
    .tech-analysis,
    .wiring-section,
    .risk-category-grid,
    .prereq-section,
    .safety-grid,
    .materials-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
        transition: transform 0.3s;
    }
    
    .sidebar.open {
        transform: translateX(0);
    }
    
    .main-content {
        margin-left: 0;
    }
    
    .features-grid,
    .component-grid,
    .interface-grid,
    .tools-grid,
    .support-system-grid,
    .principles-grid,
    .strategy-grid,
    .practice-grid,
    .chapter-nav-grid {
        grid-template-columns: 1fr;
    }
    
    .logic-flow {
        flex-direction: column;
    }
    
    .logic-arrow {
        transform: rotate(90deg);
    }
    
    .hero-section h1 {
        font-size: 26px;
    }
    
    .hero-buttons {
        flex-direction: column;
    }
}