/* ============================================
   必通管道疏通 全站主样式 - 最终基准版
   配色：简约专业蓝调 | 适配PC+移动端
   ============================================ */

:root {
    /* 主品牌色 - 柔和专业蓝，贴合清洁服务行业属性 */
    --primary: #4A90E2;
    --primary-hover: #357ABD;

    /* 深色系 - 替代纯黑，降低压抑感 */
    --dark-bg: #2C3E50;
    --dark-hover: #1A252F;

    /* 背景系统 */
    --body-bg: #F7F9FC;
    --card-bg: #FFFFFF;
    --section-alt: #F0F4F8;

    /* 文字系统 - 多级灰度，避免纯黑压迫 */
    --text-title: #2C3E50;
    --text-body: #556677;
    --text-muted: #8A9AA8;

    /* 边框与分割线 */
    --border-light: #E5EAF0;

    /* 提示组件 */
    --tip-bg: #F0F7FF;
    --tip-border: #4A90E2;
}

/* ---------- 全局重置与基础样式 ---------- */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: "Microsoft YaHei", "PingFang SC", sans-serif;
    color: var(--text-body);
    line-height: 1.6;
    background-color: var(--body-bg);
}

a {
    text-decoration: none;
    color: var(--primary);
    transition: color 0.3s ease;
}
a:hover {
    color: var(--primary-hover);
}

ul {
    list-style: none;
}

/* ---------- 通用容器与板块 ---------- */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.section {
    padding: 60px 0;
    background-color: var(--card-bg);
}

.section:nth-child(even) {
    background-color: var(--section-alt);
}

.section-title {
    text-align: center;
    font-size: 32px;
    margin-bottom: 40px;
    color: var(--text-title);
    position: relative;
    padding-bottom: 15px;
}

.section-title::after {
    content: "";
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background-color: var(--primary);
}

/* ---------- 顶部导航 ---------- */
.header {
    width: 100%;
    background-color: var(--dark-bg);
    position: sticky;
    top: 0;
    z-index: 999;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 20px;
    height: 60px;
}

.logo a {
    color: var(--primary);
    font-size: 20px;
    font-weight: bold;
}

.nav-menu {
    display: flex;
    gap: 25px;
}

.nav-menu a {
    color: #fff;
    font-size: 16px;
    transition: color 0.3s ease;
    white-space: nowrap;
}

.nav-menu a:hover,
.nav-menu a.active {
    color: var(--primary);
}

/* 汉堡按钮 - PC端隐藏 */
.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
}

.hamburger span {
    width: 25px;
    height: 2px;
    background-color: #fff;
    transition: all 0.3s ease;
}

/* ---------- 首屏Banner ---------- */
.banner {
    width: 100%;
    background: linear-gradient(135deg, #4A90E2 0%, #357ABD 100%);
    padding: 100px 20px;
    text-align: center;
    color: #fff;
}

.banner-content h1 {
    font-size: 40px;
    margin-bottom: 20px;
    line-height: 1.4;
}

.banner-sub {
    font-size: 22px;
    margin-bottom: 40px;
    opacity: 0.95;
}

.btn-primary {
    display: inline-block;
    padding: 15px 50px;
    background-color: var(--dark-bg);
    color: var(--primary);
    font-size: 22px;
    font-weight: 500;
    border-radius: 6px;
    transition: all 0.3s ease;
}

.btn-primary:hover {
    background-color: var(--dark-hover);
    transform: translateY(-2px);
    color: var(--primary);
}

/* ---------- 核心服务项目 ---------- */
.service-list {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
}

.service-item {
    background-color: var(--card-bg);
    padding: 30px 20px;
    border-radius: 8px;
    text-align: center;
    box-shadow: 0 2px 8px rgba(0,0,0,0.04);
    transition: transform 0.3s ease;
}

.service-item:hover {
    transform: translateY(-5px);
}

.service-icon {
    font-size: 48px;
    margin-bottom: 15px;
}

.service-item h3 {
    font-size: 20px;
    margin-bottom: 10px;
    color: var(--text-title);
}

.service-item p {
    color: var(--text-body);
    font-size: 14px;
}

/* ---------- 服务优势 ---------- */
.advantage-list {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
}

.advantage-item {
    padding: 25px;
    border-left: 3px solid var(--primary);
    background-color: var(--card-bg);
}

.advantage-item h3 {
    font-size: 20px;
    margin-bottom: 10px;
    color: var(--text-title);
}

.advantage-item p {
    color: var(--text-body);
    font-size: 14px;
}

/* ---------- 服务流程 ---------- */
.process-step {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

.step-item {
    text-align: center;
    padding: 20px;
    position: relative;
}

.step-num {
    display: inline-block;
    width: 50px;
    height: 50px;
    line-height: 50px;
    border-radius: 50%;
    background-color: var(--primary);
    color: #fff;
    font-size: 18px;
    font-weight: bold;
    margin-bottom: 15px;
}

.step-item h4 {
    font-size: 18px;
    margin-bottom: 10px;
    color: var(--text-title);
}

.step-item p {
    color: var(--text-body);
    font-size: 14px;
}

/* ---------- 百科/FAQ 卡片 ---------- */
.faq-list {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    padding: 20px;
    margin-bottom: 15px;
    background-color: var(--card-bg);
    border-radius: 6px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.04);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

a.faq-item {
    display: block;
    color: inherit;
}

a.faq-item:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.06);
    color: inherit;
}

.faq-item h4 {
    font-size: 18px;
    margin-bottom: 8px;
    color: var(--text-title);
}

.faq-item p {
    color: var(--text-body);
    font-size: 15px;
}

/* ---------- 收费标准 价格表 ---------- */
.price-table {
    width: 100%;
    border-collapse: collapse;
    margin: 20px 0;
    background: var(--card-bg);
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 2px 8px rgba(0,0,0,0.04);
}

.price-table th, .price-table td {
    padding: 15px 20px;
    text-align: left;
    border-bottom: 1px solid var(--border-light);
}

.price-table th {
    background: var(--primary);
    color: #fff;
    font-weight: 500;
}

.price-tip {
    background: var(--tip-bg);
    border-left: 4px solid var(--tip-border);
    padding: 15px 20px;
    margin-top: 30px;
    border-radius: 4px;
    color: var(--text-body);
    font-size: 14px;
}

/* ---------- 首页双列板块 ---------- */
.home-two-col {
    display: grid;
    grid-template-columns: 1fr;
    gap: 50px;
    align-items: start;
}

.col-block .section-title {
    font-size: 26px;
    margin-bottom: 30px;
}

/* PC端：992px宽度以上 双列并列展示 */
@media (min-width: 992px) {
    .home-two-col {
        grid-template-columns: 1fr 1fr;
        gap: 40px;
    }
}

/* ---------- 底部页脚 ---------- */
.footer {
    background-color: var(--dark-bg);
    color: #C8D1DC;
    padding: 50px 0 20px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
    margin-bottom: 30px;
}

.footer-item h3 {
    color: var(--primary);
    font-size: 20px;
    margin-bottom: 15px;
}

.footer-item h4 {
    color: #fff;
    font-size: 18px;
    margin-bottom: 15px;
}

.footer-item p {
    margin-bottom: 8px;
    font-size: 14px;
}

.footer-bottom {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid #3D4F61;
    font-size: 13px;
    color: var(--text-muted);
}

/* ========== 响应式适配 ========== */
@media (max-width: 992px) {
    .service-list,
    .advantage-list,
    .process-step {
        grid-template-columns: repeat(2, 1fr);
    }

    .banner-content h1 {
        font-size: 32px;
    }
}

@media (max-width: 768px) {
    /* 导航移动端适配 */
    .hamburger {
        display: flex;
    }

    .nav-menu {
        position: fixed;
        top: 60px;
        left: -100%;
        flex-direction: column;
        gap: 0;
        width: 80%;
        height: calc(100vh - 60px);
        background-color: var(--dark-bg);
        padding: 20px 0;
        transition: left 0.3s ease;
        overflow-y: auto;
    }

    .nav-menu.active {
        left: 0;
    }

    .nav-menu li {
        border-bottom: 1px solid #3D4F61;
    }

    .nav-menu a {
        display: block;
        padding: 15px 20px;
        font-size: 16px;
    }

    /* Banner移动端适配 */
    .banner {
        padding: 60px 20px;
    }

    .banner-content h1 {
        font-size: 26px;
    }

    .banner-sub {
        font-size: 18px;
        margin-bottom: 30px;
    }

    .btn-primary {
        padding: 12px 40px;
        font-size: 18px;
    }

    /* 板块通用适配 */
    .section {
        padding: 40px 0;
    }

    .section-title {
        font-size: 24px;
        margin-bottom: 30px;
    }

    .service-list,
    .advantage-list,
    .process-step,
    .footer-content,
    .home-two-col {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .advantage-item {
        border-left: none;
        border-top: 3px solid var(--primary);
    }

    /* 价格表适配 */
    .price-table th, .price-table td {
        padding: 12px 10px;
        font-size: 14px;
    }

    /* 卡片移动端适配 */
    .faq-item {
        padding: 16px;
    }
    .faq-item h4 {
        font-size: 16px;
    }
    .faq-item p {
        font-size: 14px;
    }

    .col-block .section-title {
        font-size: 22px;
        margin-bottom: 24px;
    }
}
/* 文章内容图片全局自适应 - 修复PC端过大问题 */
.container img {
    max-width: 100%;
    height: auto;
    display: block;
    margin: 20px auto;
    border-radius: 6px;
}

/* PC端额外限制最大宽度，避免大图铺满全屏 */
@media (min-width: 769px) {
    .container img {
        max-width: 650px;
    }
}
/* ========== 百科页面专属样式 命名空间隔离 仅baike-wrap内生效，不污染全站其他页面 ========== */
.baike-wrap .baike-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}
.baike-wrap .baike-item {
    border: 1px solid var(--border-light);
    border-radius: 8px;
    padding: 20px;
    transition: all 0.3s ease;
    background-color: var(--card-bg);
}
.baike-wrap .baike-item:hover {
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    transform: translateY(-5px);
}
.baike-wrap .baike-item h3 {
    font-size: 18px;
    margin-bottom: 10px;
    color: var(--text-title);
}
.baike-wrap .baike-item p {
    line-height: 1.5;
    color: var(--text-body);
    margin-bottom: 15px;
    font-size: 14px;
}
.baike-wrap .baike-item a {
    color: var(--primary);
    font-size: 14px;
    text-decoration: none;
    font-weight: 500;
}
.baike-wrap .pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 10px;
    margin-top: 20px;
}
.baike-wrap .pagination a,
.baike-wrap .pagination span {
    display: inline-block;
    padding: 8px 16px;
    border: 1px solid var(--border-light);
    border-radius: 4px;
    color: var(--text-body);
    text-decoration: none;
    transition: all 0.3s ease;
}
.baike-wrap .pagination a:hover {
    background-color: var(--primary);
    color: #fff;
    border-color: var(--primary);
}
.baike-wrap .pagination .active {
    background-color: var(--primary);
    color: #fff;
    border-color: var(--primary);
    pointer-events: none;
}
.baike-wrap .pagination .disabled {
    opacity: 0.5;
    pointer-events: none;
}
.baike-wrap .page-desc {
    text-align: center;
    color: var(--text-muted);
    margin-bottom: 30px;
    font-size: 16px;
}
.baike-wrap .tip-text {
    margin-top: 40px;
    text-align: center;
    font-size: 14px;
    color: var(--text-muted);
}