:root {
            --brand-blue: #0d3b66;
            --brand-deep: #07273f;
            --brand-accent: #f28c38;
            --brand-accent-hover: #e07a2a;
            --brand-light-blue: #e8f2fa;
            --brand-ice: #f0f7fc;
            --text-dark: #1a1a1a;
            --text-mid: #3d3d3d;
            --text-light: #6b6b6b;
            --border-soft: #e0e7ef;
            --bg-gray: #f9fafb;
            --bg-white: #ffffff;
            --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
            --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.08);
            --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.12);
            --radius-sm: 6px;
            --radius-md: 10px;
            --radius-lg: 16px;
            --font-main: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
            --transition-fast: 0.2s ease;
            --transition-normal: 0.3s ease;
            --max-width: 1280px;
            --header-height: 68px;
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        html {
            scroll-behavior: smooth;
            font-size: 16px;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        body {
            font-family: var(--font-main);
            color: var(--text-dark);
            background: var(--bg-white);
            line-height: 1.7;
            min-width: 320px;
            overflow-x: hidden;
            padding-top: var(--header-height);
        }
        /* 图片通用防崩容器 */
        .img-container {
            position: relative;
            width: 100%;
            overflow: hidden;
            background: #eef3f8;
        }
        .img-container img {
            display: block;
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.4s ease;
        }
        .img-container:hover img {
            transform: scale(1.03);
        }
        .aspect-4-3 { aspect-ratio: 4 / 3; }
        .aspect-16-10 { aspect-ratio: 16 / 10; }
        .aspect-16-9 { aspect-ratio: 16 / 9; }



.header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            height: var(--header-height);
            background: #fff;
            border-bottom: 1px solid var(--border-soft);
            box-shadow: var(--shadow-sm);
            display: flex;
            align-items: center;
            padding: 0 20px;
            transition: box-shadow var(--transition-normal);
        }
        .header.scrolled { box-shadow: var(--shadow-md); }
        .header .container {
            max-width: var(--max-width);
            margin: 0 auto;
            width: 100%;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .logo-wrap { flex-shrink: 0; display: flex; align-items: center; gap: 8px; }
        .logo-wrap a { display: flex; align-items: center; text-decoration: none; gap: 8px; }
        .logo-icon {width: 42px; 
    display: flex; 
    font-weight: 700;
    font-size: 1.3rem; 
    flex-shrink: 0; 
    overflow: hidden;
        }
        .logo-icon img {
    /* 最大占容器90%，四周留白，不贴边框 */
    max-width: 100%;
    max-height: 100%;
    width: auto;
    height: auto;
    /* 等比例完整显示图片，不会拉伸压扁 */
    object-fit: contain;
    display: block;
}
        .logo-icon::after {
            content: ''; position: absolute; bottom: -6px; right: -6px;
            width: 18px; height: 18px; background: var(--brand-accent); border-radius: 50%; opacity: 0.8;
        }
        .logo-text { font-weight: 700; font-size: 1.25rem; color: var(--brand-blue); letter-spacing: 0.04em; white-space: nowrap; }
        .logo-text small { display: block; font-size: 0.65rem; font-weight: 400; color: var(--text-light); letter-spacing: 0.06em; line-height: 1; }
        .nav-links { display: flex; list-style: none; gap: 6px; align-items: center; }
        .nav-links>li { position: relative; }
        .nav-links>li>a {
            display: block; padding: 10px 15px; text-decoration: none; color: var(--text-dark);
            font-weight: 500; font-size: 0.93rem; border-radius: var(--radius-sm); transition: all var(--transition-fast); white-space: nowrap;
        }
        .nav-links>li>a:hover, .nav-links>li>a.active { color: var(--brand-blue); background: var(--brand-light-blue); }
        .nav-links>li.has-dropdown>a::after {
            content: ''; display: inline-block; width: 6px; height: 6px;
            border-right: 1.5px solid currentColor; border-bottom: 1.5px solid currentColor;
            transform: rotate(45deg); margin-left: 6px; vertical-align: middle; transition: transform var(--transition-fast);
        }
        .nav-links>li.has-dropdown:hover>a::after { transform: rotate(-135deg); }
        .nav-links .dropdown {
            position: absolute; top: 100%; left: 0; background: #fff; border-radius: var(--radius-md);
            box-shadow: var(--shadow-lg); min-width: 220px; opacity: 0; visibility: hidden;
            transform: translateY(8px); transition: all var(--transition-normal); z-index: 999; padding: 8px 0; border: 1px solid var(--border-soft);
        }
        .nav-links>li.has-dropdown:hover .dropdown { opacity: 1; visibility: visible; transform: translateY(0); }
        .nav-links .dropdown li { list-style: none; }
        .nav-links .dropdown li a {
            display: block; padding: 9px 20px; text-decoration: none; color: var(--text-mid); font-size: 0.88rem; transition: all var(--transition-fast); white-space: nowrap;
        }
        .nav-links .dropdown li a:hover { background: var(--brand-ice); color: var(--brand-blue); padding-left: 24px; }
        .header-cta { flex-shrink: 0; display: flex; align-items: center; gap: 12px; }
        .header-cta .tel-header { font-weight: 700; font-size: 1.1rem; color: var(--brand-blue); text-decoration: none; white-space: nowrap; }
        .header-cta .tel-header:hover { color: var(--brand-accent); }
        .city-switch-link {
            font-size: 0.82rem; color: var(--text-light); text-decoration: none; border: 1px solid var(--border-soft);
            padding: 6px 14px; border-radius: 20px; transition: all var(--transition-fast); white-space: nowrap;
        }
        .city-switch-link:hover { background: var(--brand-light-blue); color: var(--brand-blue); }
        .btn-nav-cta {
            display: inline-block; padding: 10px 20px; background: var(--brand-accent); color: #fff; border-radius: 30px;
            text-decoration: none; font-weight: 600; font-size: 0.88rem; transition: all var(--transition-fast); white-space: nowrap;
        }
        .btn-nav-cta:hover { background: var(--brand-accent-hover); transform: translateY(-1px); box-shadow: 0 4px 12px rgba(242,140,56,0.35); }
        .mobile-toggle { display: none; background: none; border: none; cursor: pointer; padding: 8px; }
        .mobile-toggle span { display: block; width: 26px; height: 2.5px; background: var(--brand-blue); margin: 5px 0; border-radius: 2px; transition: all var(--transition-fast); }

        .container { max-width: var(--max-width); margin: 0 auto; padding: 0 20px; width: 100%; }
        .section { padding: 60px 0; }
        .section-sm { padding: 40px 0; }
        .section-title { text-align: center; margin-bottom: 40px; }
        .section-title h2 { font-size: 1.8rem; font-weight: 700; color: var(--brand-deep); margin-bottom: 8px; }
        .section-title .sub { font-size: 0.95rem; color: var(--text-light); }
        .section-title .divider { display: block; width: 50px; height: 3px; background: var(--brand-accent); margin: 12px auto 0; border-radius: 2px; }
        
        
        
        
        
.footer { background: #0b2a40; color: #b8ccdb; padding: 48px 0 20px; }
        .footer-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); margin-bottom: 30px; }
        .footer-grid h5 { color: #fff; font-size: 0.9rem; margin-bottom: 12px; }
        .footer-grid ul { list-style: none; }
        .footer-grid ul li { margin-bottom: 6px; }
        .footer-grid ul li a { color: #b8ccdb; text-decoration: none; font-size: 0.8rem; }
        .footer-grid ul li a:hover { color: #fff; }
        .footer-bottom { border-top: 1px solid rgba(255,255,255,0.1); padding-top: 16px; display: flex; flex-wrap: wrap; justify-content: space-between; font-size: 0.75rem; color: #889eaf; }
        .footer-bottom a{color:#889eaf}
        .side-fixed-bar { position: fixed; right: 12px; bottom: 80px; z-index: 999; display: flex; flex-direction: column; gap: 8px; }
        .side-fixed-bar a { display: flex; align-items: center; justify-content: center; width: 44px; height: 44px; border-radius: 50%; background: #fff; box-shadow: var(--shadow-md); text-decoration: none; color: var(--brand-blue); font-size: 1.1rem; border: 1px solid var(--border-soft); }
        .side-fixed-bar a:hover { background: var(--brand-blue); color: #fff; }
        .side-fixed-bar .side-emergency { background: #e53935; color: #fff; border-color: #e53935; animation: pulse 2s infinite; }
        @keyframes pulse { 0%,100%{box-shadow:0 0 0 0 rgba(229,57,53,0.5);} 50%{box-shadow:0 0 0 10px rgba(229,57,53,0);} }

        @media (max-width: 1024px) {
            .nav-links { display: none; position: absolute; top: 100%; left: 0; right: 0; background: #fff; flex-direction: column; padding: 10px 0; box-shadow: var(--shadow-lg); max-height: 70vh; overflow-y: auto; }
            .nav-links.show { display: flex; }
            .nav-links .dropdown { position: static; opacity: 1; visibility: visible; transform: none; box-shadow: none; border: none; padding-left: 20px; display: none; }
            .nav-links>li.has-dropdown.open .dropdown { display: block; }
            .mobile-toggle { display: block; }
            .header-cta .btn-nav-cta { display: none; }
            .hero .container { flex-direction: column; text-align: center; }
            .hero-content .hero-desc { max-width: 100%; }
            .hero-btns { justify-content: center; }
        }
        @media (max-width: 640px) {
            :root { --header-height: 56px; }
            .header { padding: 0 12px; }
            .logo-text { font-size: 1rem; }
            .hero-content h1 { font-size: 1.4rem; }
            .services-grid { grid-template-columns: repeat(auto-fill, minmax(140px, 1fr)); }
            .price-grid { grid-template-columns: repeat(auto-fill, minmax(130px, 1fr)); }
        }