/* ============================================
   city-main.css - 城市分站主体内容独立样式
   作用范围：Banner、产品、案例、FAQ、优势、联系模块、移动端底部导航
   要求：不与原站头部/页脚样式冲突
   适配：PC端、平板、手机三端
   ============================================ */

/* ---------- 基础变量（与原站jh-robot.com配色协调） ---------- */
:root {
    --primary-color: #1a5276;
    --primary-hover: #154360;
    --primary-light: #2e86c1;
    --cta-color: #e74c3c;
    --cta-hover: #c0392b;
    --secondary-color: #f39c12;
    --text-dark: #2c3e50;
    --text-gray: #555555;
    --text-light: #888888;
    --bg-white: #ffffff;
    --bg-light: #f5f7fa;
    --bg-gray: #eef1f5;
    --border-color: #dce1e8;
    --shadow-sm: 0 2px 8px rgba(0,0,0,0.06);
    --shadow-md: 0 4px 16px rgba(0,0,0,0.1);
    --shadow-lg: 0 8px 32px rgba(0,0,0,0.12);
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --transition: all 0.3s ease;
    --container-max: 1200px;
    --section-padding: 80px;
}

/* --- 全局样式覆盖（修复style.css冲突） --- */
body {
    color: #333 !important;
    background-color: #f5f5f5 !important;
}

a {
    color: inherit;
}

/* 确保style.css中的contact-section深色背景不作用于我们的页面 */
.city-section.contact-section {
    background: linear-gradient(135deg, #154360 0%, #1a5276 100%) !important;
    color: #fff !important;
}

.city-section.contact-section .section-title {
    color: #fff;
}

.city-section.contact-section .section-subtitle {
    color: rgba(255,255,255,0.7);
}

.city-section.contact-section .title-line {
    background: var(--cta-color);
}

.city-section.contact-section .contact-info {
    background: rgba(255,255,255,0.1);
    border-color: rgba(255,255,255,0.15);
}

.city-section.contact-section .contact-info h3 {
    color: #fff;
    border-bottom-color: var(--cta-color);
}

.city-section.contact-section .contact-label {
    color: rgba(255,255,255,0.7);
}

.city-section.contact-section .contact-value {
    color: #fff;
}

.city-section.contact-section .contact-item i {
    background: rgba(255,255,255,0.15);
}

.city-section.contact-section .contact-big-btn {
    background: var(--cta-color);
    color: #fff;
}

/* ---------- 公共容器 ---------- */
.city-section {
    padding: var(--section-padding) 0;
    position: relative;
}

.city-section:nth-child(even) {
    background-color: var(--bg-light);
}

.city-section:nth-child(odd) {
    background-color: var(--bg-white);
}

.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 20px;
    box-sizing: border-box;
}

/* ---------- 公共标题样式 ---------- */
.section-header {
    text-align: center;
    margin-bottom: 50px;
}

.section-title {
    font-size: 32px;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 8px;
    position: relative;
    display: inline-block;
}

.section-subtitle {
    font-size: 14px;
    color: var(--text-light);
    letter-spacing: 4px;
    text-transform: uppercase;
    margin-bottom: 12px;
}

.title-line {
    width: 60px;
    height: 3px;
    background: var(--primary-color);
    margin: 0 auto;
    border-radius: 2px;
}

/* ---------- 按钮样式 ---------- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 32px;
    border-radius: var(--radius-md);
    font-size: 16px;
    font-weight: 600;
    text-decoration: none;
    transition: var(--transition);
    cursor: pointer;
    border: none;
    gap: 8px;
}

.btn-primary {
    background: var(--cta-color);
    color: #fff;
}

.btn-primary:hover {
    background: var(--cta-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background: transparent;
    color: #fff;
    border: 2px solid #fff;
}

.btn-secondary:hover {
    background: #fff;
    color: var(--primary-color);
}

/* ============================================
   模块2：首页横幅Banner
   ============================================ */
.city-banner {
    position: relative;
    width: 100%;
    height: 600px;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
}

.banner-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
}

.banner-bg img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.banner-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.55);
    z-index: 2;
}

.banner-content {
    position: relative;
    z-index: 3;
    text-align: center;
    color: #fff;
    width: 100%;
}

.banner-title {
    font-size: 48px;
    font-weight: 800;
    margin-bottom: 16px;
    text-shadow: 0 2px 10px rgba(0,0,0,0.3);
    letter-spacing: 2px;
}

.banner-subtitle {
    font-size: 22px;
    font-weight: 500;
    margin-bottom: 12px;
    opacity: 0.95;
}

.banner-desc {
    font-size: 16px;
    margin-bottom: 32px;
    opacity: 0.85;
    letter-spacing: 1px;
}

.banner-btns {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

/* 悬浮电话按钮 */
.banner-float-phone {
    position: absolute;
    right: 30px;
    bottom: 30px;
    z-index: 4;
    background: var(--cta-color);
    color: #fff;
    padding: 14px 24px;
    border-radius: 50px;
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 16px;
    font-weight: 600;
    box-shadow: var(--shadow-lg);
    animation: pulse 2s infinite;
    transition: var(--transition);
}

.banner-float-phone:hover {
    background: var(--cta-hover);
    transform: scale(1.05);
}

@keyframes pulse {
    0%, 100% { box-shadow: 0 0 0 0 rgba(231, 76, 60, 0.5); }
    50% { box-shadow: 0 0 0 12px rgba(231, 76, 60, 0); }
}

/* ============================================
   模块3：关于我们板块
   ============================================ */
.about-content {
    display: flex;
    gap: 50px;
    align-items: center;
}

.about-image {
    flex: 0 0 45%;
    max-width: 500px;
}

.about-image img {
    width: 100%;
    height: auto;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

.about-text {
    flex: 1;
}

.about-text h3 {
    font-size: 24px;
    color: var(--text-dark);
    margin-bottom: 20px;
    font-weight: 700;
}

.about-desc {
    font-size: 15px;
    line-height: 1.8;
    color: var(--text-gray);
    margin-bottom: 16px;
    text-align: justify;
}

.about-features {
    display: flex;
    gap: 24px;
    margin: 28px 0;
    flex-wrap: wrap;
}

.feature-item {
    text-align: center;
    padding: 16px 20px;
    background: var(--bg-white);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    min-width: 100px;
    border: 1px solid var(--border-color);
}

.feature-num {
    display: block;
    font-size: 28px;
    font-weight: 800;
    color: var(--primary-color);
    line-height: 1;
}

.feature-label {
    display: block;
    font-size: 13px;
    color: var(--text-gray);
    margin-top: 6px;
}

.about-phone-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: var(--cta-color);
    color: #fff;
    padding: 14px 28px;
    border-radius: var(--radius-md);
    text-decoration: none;
    font-size: 16px;
    font-weight: 600;
    transition: var(--transition);
    margin-top: 8px;
}

.about-phone-btn:hover {
    background: var(--cta-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* ============================================
   模块4：吊车展示板块
   ============================================ */
.product-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.product-card {
    background: var(--bg-white);
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    border: 1px solid var(--border-color);
}

.product-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}

.product-image {
    width: 100%;
    height: 200px;
    overflow: hidden;
    background: var(--bg-gray);
    display: flex;
    align-items: center;
    justify-content: center;
}

.product-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}

.product-card:hover .product-image img {
    transform: scale(1.08);
}

/* 产品空白占位样式 */
.product-image-placeholder {
    background: linear-gradient(135deg, #e8edf2 0%, #d5dde5 100%);
    border-bottom: 1px solid var(--border-color);
}

.placeholder-text {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-light);
    letter-spacing: 1px;
}

.product-info {
    padding: 20px;
}

.product-name {
    font-size: 18px;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 12px;
}

.product-params {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-bottom: 12px;
}

.param {
    font-size: 12px;
    color: var(--text-gray);
    background: var(--bg-light);
    padding: 4px 10px;
    border-radius: 20px;
    border: 1px solid var(--border-color);
}

.product-desc {
    font-size: 13px;
    color: var(--text-light);
    line-height: 1.6;
    margin-bottom: 16px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.product-btn {
    display: block;
    text-align: center;
    background: var(--cta-color);
    color: #fff;
    padding: 10px;
    border-radius: var(--radius-sm);
    text-decoration: none;
    font-size: 14px;
    font-weight: 600;
    transition: var(--transition);
}

.product-btn:hover {
    background: var(--cta-hover);
}

/* ============================================
   模块5：施工案例板块
   ============================================ */
.case-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.case-card {
    background: var(--bg-white);
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    border: 1px solid var(--border-color);
}

.case-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
}

.case-image {
    width: 100%;
    height: 220px;
    overflow: hidden;
    background: var(--bg-gray);
    display: flex;
    align-items: center;
    justify-content: center;
}

.case-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}

.case-card:hover .case-image img {
    transform: scale(1.06);
}

.case-info {
    padding: 20px;
}

.case-name {
    font-size: 17px;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 8px;
}

.case-type {
    font-size: 13px;
    color: var(--primary-color);
    font-weight: 600;
    margin-bottom: 10px;
}

.case-desc {
    font-size: 13px;
    color: var(--text-gray);
    line-height: 1.6;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* ============================================
   模块6：常见问题板块
   ============================================ */
.faq-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
}

.faq-card {
    background: var(--bg-white);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.faq-card:hover {
    box-shadow: var(--shadow-md);
}

.faq-question {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 18px 20px;
    cursor: pointer;
    background: var(--bg-white);
    transition: var(--transition);
    user-select: none;
}

.faq-question:hover {
    background: var(--bg-light);
}

.faq-icon {
    width: 32px;
    height: 32px;
    background: var(--cta-color);
    color: #fff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 14px;
    flex-shrink: 0;
}

.faq-question h3 {
    flex: 1;
    font-size: 15px;
    font-weight: 600;
    color: var(--text-dark);
    margin: 0;
    line-height: 1.4;
}

.faq-toggle {
    font-size: 22px;
    font-weight: 300;
    color: var(--cta-color);
    transition: var(--transition);
    flex-shrink: 0;
    width: 24px;
    text-align: center;
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.35s ease;
    background: var(--bg-light);
}

.faq-answer.open {
    max-height: 500px;
}

.faq-answer p {
    padding: 0 20px 18px 64px;
    font-size: 14px;
    line-height: 1.8;
    color: var(--text-gray);
    margin: 0;
}

/* ============================================
   模块7：我们的优势板块
   ============================================ */
.advantage-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.advantage-card {
    background: var(--bg-white);
    border-radius: var(--radius-md);
    padding: 36px 28px;
    text-align: center;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.advantage-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-color);
}

.advantage-icon {
    width: 70px;
    height: 70px;
    background: var(--bg-light);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    font-size: 28px;
    color: var(--primary-color);
    transition: var(--transition);
}

.advantage-card:hover .advantage-icon {
    background: var(--cta-color);
    color: #fff;
}

.advantage-card h3 {
    font-size: 18px;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 12px;
}

.advantage-card p {
    font-size: 14px;
    color: var(--text-gray);
    line-height: 1.7;
}

/* 图标样式（使用CSS绘制） */
.icon-crane::before { content: "🏗"; }
.icon-team::before { content: "👷"; }
.icon-service::before { content: "🔄"; }
.icon-price::before { content: "💰"; }
.icon-fast::before { content: "⚡"; }
.icon-safe::before { content: "🛡"; }

/* ============================================
   模块8：联系方式板块
   ============================================ */
.contact-content {
    display: flex;
    gap: 30px;
    align-items: stretch;
}

.contact-content-single {
    justify-content: center;
}

.contact-content-single .contact-info {
    flex: 0 0 100%;
    max-width: 600px;
}

.contact-info {
    flex: 1;
    background: var(--bg-white);
    border-radius: var(--radius-lg);
    padding: 36px;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
}

.contact-info h3 {
    font-size: 22px;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 28px;
    padding-bottom: 16px;
    border-bottom: 2px solid var(--cta-color);
}

.contact-item {
    display: flex;
    gap: 16px;
    margin-bottom: 20px;
    align-items: flex-start;
}

.contact-item i {
    width: 40px;
    height: 40px;
    background: var(--bg-light);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    color: var(--cta-color);
    flex-shrink: 0;
    font-style: normal;
}

.contact-label {
    display: block;
    font-size: 13px;
    color: var(--text-light);
    margin-bottom: 4px;
}

.contact-value {
    font-size: 15px;
    color: var(--text-dark);
    font-weight: 500;
    line-height: 1.5;
}

.phone-highlight {
    font-size: 22px;
    font-weight: 800;
    color: var(--cta-color);
    text-decoration: none;
}

.contact-big-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    background: var(--cta-color);
    color: #fff;
    padding: 16px;
    border-radius: var(--radius-md);
    text-decoration: none;
    font-size: 18px;
    font-weight: 700;
    margin-top: 24px;
    transition: var(--transition);
}

.contact-big-btn:hover {
    background: var(--cta-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.contact-map {
    flex: 1;
    min-height: 400px;
}

.map-placeholder {
    width: 100%;
    height: 100%;
    min-height: 400px;
    background: var(--bg-gray);
    border-radius: var(--radius-lg);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    border: 2px dashed var(--border-color);
    overflow: hidden;
    position: relative;
}

.map-placeholder img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    opacity: 0.6;
}

.map-tip {
    position: absolute;
    background: rgba(0,0,0,0.7);
    color: #fff;
    padding: 10px 20px;
    border-radius: var(--radius-sm);
    font-size: 14px;
    text-align: center;
}

/* 联系图标 */
.icon-contact-phone::before { content: "📞"; }
.icon-contact-service::before { content: "📋"; }
.icon-contact-area::before { content: "📍"; }
.icon-contact-time::before { content: "🕐"; }

/* ============================================
   右侧悬浮电话按钮
   ============================================ */
.float-contact {
    position: fixed;
    right: 20px;
    bottom: 100px;
    z-index: 999;
    display: flex;
    flex-direction: column;
    gap: 12px;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
}

.float-contact.show {
    opacity: 1;
    visibility: visible;
}

.float-phone {
    display: flex;
    align-items: center;
    gap: 8px;
    background: var(--cta-color);
    color: #fff;
    padding: 12px 20px;
    border-radius: 50px;
    text-decoration: none;
    font-size: 15px;
    font-weight: 600;
    box-shadow: var(--shadow-lg);
    transition: var(--transition);
    white-space: nowrap;
}

.float-phone:hover {
    background: var(--cta-hover);
    transform: scale(1.05);
}

.float-text {
    display: inline;
}

.float-top {
    width: 48px;
    height: 48px;
    background: var(--text-dark);
    color: #fff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    margin-left: auto;
}

.float-top:hover {
    background: var(--cta-color);
    transform: translateY(-3px);
}

.icon-top::before { content: "↑"; font-size: 20px; }
.icon-phone-float::before { content: "📞"; }

/* ============================================
   移动端底部固定导航栏
   ============================================ */
.mobile-bottom-nav {
    display: none;
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
    background: #1a2332;
    box-shadow: 0 -2px 10px rgba(0,0,0,0.2);
    z-index: 1000;
    padding-bottom: env(safe-area-inset-bottom, 0);
}

.mob-nav-item {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 10px 4px;
    text-decoration: none;
    color: rgba(255,255,255,0.8);
    font-size: 11px;
    transition: var(--transition);
    gap: 4px;
}

.mob-nav-item:hover {
    color: #fff;
}

.mob-nav-item i {
    font-size: 20px;
    font-style: normal;
}

.mob-nav-item:nth-child(4) {
    background: var(--cta-color);
    color: #fff;
    border-radius: 8px 8px 0 0;
    margin-top: -6px;
    padding-top: 14px;
}

.mob-nav-item:nth-child(4):hover {
    background: var(--cta-hover);
}

.icon-home::before { content: "🏠"; }
.icon-call::before { content: "📞"; }
.icon-case::before { content: "📁"; }
.icon-chat::before { content: "💬"; }

/* ============================================
   页脚样式补充（主体区域）
   ============================================ */
.site-footer {
    background: #2c3e50;
    color: #fff;
}

.footer-main {
    padding: 60px 0 30px;
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 40px;
}

.footer-about h4,
.footer-links h4,
.footer-contact h4 {
    font-size: 18px;
    margin-bottom: 20px;
    color: #fff;
}

.footer-about p {
    font-size: 14px;
    line-height: 1.8;
    color: rgba(255,255,255,0.7);
}

.footer-links ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.footer-links li {
    margin-bottom: 10px;
}

.footer-links a {
    color: rgba(255,255,255,0.7);
    text-decoration: none;
    font-size: 14px;
    transition: var(--transition);
}

.footer-links a:hover {
    color: var(--primary-color);
}

.footer-contact p {
    font-size: 14px;
    color: rgba(255,255,255,0.7);
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.footer-bottom {
    background: #1a252f;
    padding: 20px 0;
    text-align: center;
}

.footer-bottom p {
    font-size: 13px;
    color: rgba(255,255,255,0.5);
    margin: 4px 0;
}

.footer-bottom a {
    color: rgba(255,255,255,0.5);
    text-decoration: none;
}

.footer-bottom a:hover {
    color: var(--primary-color);
}

/* ============================================
   响应式适配 - 平板端 (768px - 1024px)
   ============================================ */
@media screen and (max-width: 1024px) {
    :root {
        --section-padding: 60px;
    }

    .section-title {
        font-size: 28px;
    }

    .about-content {
        flex-direction: column;
        gap: 30px;
    }

    .about-image {
        flex: none;
        max-width: 100%;
    }

    .product-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .case-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .faq-grid {
        grid-template-columns: 1fr;
    }

    .advantage-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .contact-content {
        flex-direction: column;
    }

    .contact-info {
        flex: none;
    }

    .footer-content {
        grid-template-columns: 1fr 1fr;
    }
}

/* ============================================
   响应式适配 - 手机端 (< 768px)
   ============================================ */
@media screen and (max-width: 768px) {
    :root {
        --section-padding: 40px;
    }

    .container {
        padding: 0 16px;
    }

    .section-header {
        margin-bottom: 30px;
    }

    .section-title {
        font-size: 22px;
    }

    .section-subtitle {
        font-size: 12px;
    }

    /* Banner移动端 */
    .city-banner {
        height: 450px;
    }

    .banner-title {
        font-size: 28px;
    }

    .banner-subtitle {
        font-size: 16px;
    }

    .banner-desc {
        font-size: 13px;
        padding: 0 20px;
    }

    .banner-btns {
        flex-direction: column;
        align-items: center;
        padding: 0 20px;
    }

    .btn {
        width: 100%;
        max-width: 280px;
    }

    .banner-float-phone {
        right: 10px;
        bottom: 80px;
        padding: 10px 16px;
        font-size: 14px;
    }

    /* 关于我们移动端 */
    .about-features {
        gap: 12px;
    }

    .feature-item {
        min-width: 70px;
        padding: 12px 14px;
    }

    .feature-num {
        font-size: 22px;
    }

    .feature-label {
        font-size: 11px;
    }

    /* 产品展示移动端 - 2个一行 */
    .product-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 12px;
    }

    .product-image {
        height: 140px;
    }

    .product-info {
        padding: 12px;
    }

    .product-name {
        font-size: 14px;
    }

    .param {
        font-size: 10px;
        padding: 2px 6px;
    }

    .product-desc {
        font-size: 11px;
        -webkit-line-clamp: 2;
    }

    .product-btn {
        padding: 8px;
        font-size: 12px;
    }

    /* 施工案例移动端 - 2个一行 */
    .case-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 12px;
    }

    .case-image {
        height: 140px;
    }

    .case-info {
        padding: 12px;
    }

    .case-name {
        font-size: 13px;
    }

    .case-type {
        font-size: 11px;
    }

    .case-desc {
        font-size: 11px;
    }

    /* FAQ移动端 - 1个一行 */
    .faq-grid {
        grid-template-columns: 1fr;
        gap: 12px;
    }

    .faq-question {
        padding: 14px 16px;
    }

    .faq-question h3 {
        font-size: 13px;
    }

    .faq-icon {
        width: 26px;
        height: 26px;
        font-size: 12px;
    }

    .faq-answer p {
        padding: 0 16px 14px 48px;
        font-size: 12px;
    }

    /* 优势板块移动端 */
    .advantage-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 12px;
    }

    .advantage-card {
        padding: 24px 16px;
    }

    .advantage-icon {
        width: 50px;
        height: 50px;
        font-size: 22px;
    }

    .advantage-card h3 {
        font-size: 14px;
    }

    .advantage-card p {
        font-size: 12px;
    }

    /* 联系方式移动端 */
    .contact-info {
        padding: 24px;
    }

    .contact-info h3 {
        font-size: 18px;
    }

    .contact-item {
        gap: 12px;
    }

    .contact-item i {
        width: 32px;
        height: 32px;
        font-size: 14px;
    }

    .phone-highlight {
        font-size: 18px;
    }

    .contact-big-btn {
        font-size: 16px;
        padding: 14px;
    }

    .map-placeholder {
        min-height: 250px;
    }

    /* 页脚移动端 */
    .footer-content {
        grid-template-columns: 1fr;
        gap: 30px;
    }

    .footer-main {
        padding: 40px 0 20px;
    }

    /* 悬浮按钮移动端调整 */
    .float-contact {
        right: 10px;
        bottom: 80px;
    }

    .float-text {
        display: none;
    }

    .float-phone {
        width: 48px;
        height: 48px;
        border-radius: 50%;
        padding: 0;
        justify-content: center;
    }

    /* 移动端隐藏右侧悬浮电话按钮（靠近顶部时可见的那个） */
    .banner-float-phone {
        display: none !important;
    }

    /* 移动端底部固定导航栏显示 */
    .mobile-bottom-nav {
        display: flex !important;
    }

    /* 页面底部增加padding，避免被底部导航遮挡 */
    body {
        padding-bottom: 60px;
    }
}

/* ============================================
   响应式适配 - 小屏手机 (< 480px)
   ============================================ */
@media screen and (max-width: 480px) {
    .city-banner {
        height: 380px;
    }

    .banner-title {
        font-size: 22px;
    }

    .banner-subtitle {
        font-size: 14px;
    }

    .product-grid,
    .case-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 10px;
    }

    .product-image,
    .case-image {
        height: 120px;
    }

    .about-features {
        justify-content: center;
    }

    .feature-item {
        min-width: 60px;
        padding: 10px 12px;
    }

    .feature-num {
        font-size: 18px;
    }

    .advantage-grid {
        grid-template-columns: 1fr;
    }

    .faq-question h3 {
        font-size: 12px;
    }
}

/* ============================================
   头部导航补充样式（兼容移动端）
   ============================================ */
/* --- 头部区域样式覆盖（确保与原站一致） --- */
.site-header {
    background-color: #fff;
    position: relative;
    width: 100%;
}

.top-bar {
    background-color: var(--primary-color);
    color: #fff;
    padding: 8px 0;
    font-size: 13px;
}

.top-bar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.top-bar-left .welcome-text {
    color: rgba(255,255,255,0.9);
}

.top-bar-right .hotline {
    color: rgba(255,255,255,0.9);
}

.top-bar-right .hotline i {
    margin-right: 4px;
}

.main-nav {
    background-color: #fff;
    box-shadow: 0 1px 6px rgba(0,0,0,0.08);
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo a {
    display: flex;
    align-items: center;
    text-decoration: none;
}

.logo-img {
    height: 45px;
    width: auto;
}

.logo-text h1 {
    font-size: 18px;
    font-weight: 700;
    color: var(--primary-color);
    line-height: 1.2;
}

.logo-text p {
    font-size: 12px;
    color: var(--text-light);
}

.nav-list {
    display: flex;
    list-style: none;
    gap: 4px;
    margin: 0;
    padding: 0;
}

.nav-list li a {
    display: block;
    padding: 8px 14px;
    color: var(--text-dark);
    text-decoration: none;
    font-size: 15px;
    border-radius: 4px;
    transition: var(--transition);
    white-space: nowrap;
}

.nav-list li a:hover {
    color: #fff;
    background-color: var(--primary-color);
}

.header-phone {
    flex-shrink: 0;
}

.phone-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    background: var(--cta-color);
    color: #fff;
    padding: 10px 20px;
    border-radius: 50px;
    text-decoration: none;
    font-size: 15px;
    font-weight: 600;
    transition: var(--transition);
}

.phone-btn:hover {
    background: var(--cta-hover);
    transform: translateY(-1px);
}

.phone-number {
    font-size: 15px;
    font-weight: 600;
    color: #fff;
}

/* 头部横幅占位 */
.header-banner {
    width: 100%;
    overflow: hidden;
    background: var(--bg-gray);
}

.header-banner img {
    width: 100%;
    height: auto;
    display: block;
}

/* --- 图标占位（头部用到的） --- */
.icon-phone::before { content: "📞"; }
.icon-phone-big::before { content: "📞"; }

/* 移动端菜单按钮 */
.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
    z-index: 1002;
}

.mobile-menu-btn span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text-dark);
    transition: var(--transition);
}

.mobile-menu-btn.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.mobile-menu-btn.active span:nth-child(2) {
    opacity: 0;
}

.mobile-menu-btn.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* 移动端菜单遮罩层 */
.nav-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.5);
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
}

.nav-overlay.open {
    opacity: 1;
    visibility: visible;
    pointer-events: none; /* 让点击穿透到导航菜单，通过document监听关闭 */
}

@media screen and (max-width: 768px) {
    .mobile-menu-btn {
        display: flex;
    }

    .nav-overlay {
        display: block;
    }

    .nav-menu {
        position: fixed !important;
        top: 0 !important;
        right: -100% !important;
        left: auto !important;
        width: 70% !important;
        max-width: 300px;
        height: 100vh !important;
        background: var(--bg-white) !important;
        z-index: 1001 !important;
        transition: right 0.3s ease !important;
        box-shadow: -4px 0 20px rgba(0,0,0,0.15) !important;
        padding: 80px 20px 20px !important;
        overflow-y: auto;
        display: flex !important;
        flex-direction: column;
    }

    .nav-menu.open {
        right: 0 !important;
    }

    .nav-list {
        flex-direction: column;
        list-style: none;
        padding: 0;
        margin: 0;
    }

    .nav-list li {
        border-bottom: 1px solid var(--border-color);
    }

    .nav-list a {
        display: block;
        padding: 14px 0;
        color: var(--text-dark);
        text-decoration: none;
        font-size: 15px;
    }

    .nav-list a:hover {
        color: var(--primary-color);
        background: none;
    }

    .header-phone {
        display: none;
    }

    .logo-text h1 {
        font-size: 15px;
    }

    .logo-text p {
        font-size: 11px;
    }

    .logo-img {
        height: 36px;
    }

    .nav-container {
        height: 60px;
    }

    .top-bar {
        font-size: 12px;
        padding: 6px 0;
    }
}

/* ============================================
   打印样式
   ============================================ */
@media print {
    .float-contact,
    .mobile-bottom-nav,
    .banner-float-phone {
        display: none !important;
    }

    .city-section {
        padding: 30px 0;
        page-break-inside: avoid;
    }
}