:root {
    --primary: #0a4c9a;
    --primary-dark: #06336b;
    --primary-light: #2f80ed;
    --accent: #4dabf7;
    --bg-white: #ffffff;
    --bg-light: #f4f8fd;
    --bg-gradient: linear-gradient(135deg, #eaf2fb 0%, #ffffff 60%, #dcebff 100%);
    --text: #1c2b3a;
    --text-light: #4a5c6e;
    --text-lighter: #7d8ea0;
    --border: #dfe8f2;
    --shadow: 0 6px 24px rgba(10, 76, 154, 0.08);
    --shadow-hover: 0 12px 32px rgba(10, 76, 154, 0.16);
    --transition: all 0.3s ease;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }

/* Logo 图片（替换原来的 JC 文字标记） */
.logo img.logo-img,
.footer-logo img.logo-img-small {
    height: 40px;
    width: auto;
    vertical-align: middle;
    border-radius: 50%;
    background: #fff;
    padding: 2px;
    box-shadow: 0 2px 8px rgba(10,76,154,0.15);
}
.footer-logo img.logo-img-small { height: 34px; }
.logo-text { margin-left: 10px; }

/* 产品参数表 */
.spec-table {
    width: 100%;
    border-collapse: collapse;
    margin: 16px 0 20px;
    font-size: 14px;
    background: #fff;
    box-shadow: 0 2px 12px rgba(10,76,154,0.06);
}
.spec-table th {
    background: linear-gradient(90deg, var(--primary), var(--primary-light));
    color: #fff;
    font-weight: 600;
    padding: 10px 12px;
    text-align: left;
    white-space: nowrap;
}
.spec-table td {
    padding: 9px 12px;
    border-bottom: 1px solid var(--border);
    color: var(--text);
}
.spec-table tbody tr:nth-child(even) { background: #f7fbff; }
.spec-table tbody tr:hover { background: #eef5ff; }
.table-responsive { overflow-x: auto; }

/* 产品图 / 尺寸图 */
.product-figure {
    margin: 18px 0;
    text-align: center;
}
.product-figure img {
    max-width: 100%;
    height: auto;
    max-height: 320px;
    object-fit: contain;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: var(--bg-gradient);
    padding: 12px;
}
.fig-caption {
    font-size: 13px;
    color: var(--text-lighter);
    margin-top: 8px;
}

/* 产品系列锚点：定位时避开吸顶导航遮挡 */
.product-category[id] {
    scroll-margin-top: 110px;
}
body {
    font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
    color: var(--text);
    line-height: 1.7;
    background: var(--bg-white);
    -webkit-font-smoothing: antialiased;
}
a { text-decoration: none; color: inherit; }
ul { list-style: none; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
.text-center { text-align: center; }
.mt-40 { margin-top: 40px; }

/* ===== Top Bar ===== */
.top-bar {
    background: linear-gradient(90deg, var(--primary-dark), var(--primary));
    color: rgba(255,255,255,0.85);
    font-size: 13px;
    padding: 8px 0;
}
.top-bar .container { display: flex; justify-content: space-between; align-items: center; }
.top-bar-left span { margin-right: 22px; }
.top-bar-left i { margin-right: 6px; color: var(--accent); }
.top-bar-right .lang-label { color: rgba(255,255,255,0.7); cursor: default; }

/* ===== Header ===== */
.header {
    background: rgba(255,255,255,0.95);
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 20px rgba(10,76,154,0.08);
    position: sticky;
    top: 0;
    z-index: 100;
}
.header .container { display: flex; align-items: center; justify-content: space-between; height: 76px; }
.logo a { display: flex; align-items: center; gap: 12px; }
.logo-mark {
    width: 44px; height: 44px; border-radius: 10px;
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    color: #fff; font-weight: 700; font-size: 18px;
    display: flex; align-items: center; justify-content: center;
    box-shadow: 0 4px 12px rgba(10,76,154,0.3);
}
.logo-text {
    font-size: 20px; font-weight: 700; color: var(--primary-dark);
    display: flex; flex-direction: column; line-height: 1.1;
}
.logo-sub { font-size: 9px; letter-spacing: 1px; color: var(--text-lighter); font-weight: 400; }

.nav ul { display: flex; gap: 8px; align-items: center; }
.nav a {
    display: block; padding: 8px 14px; border-radius: 8px;
    color: var(--text); font-size: 15px; font-weight: 500;
    transition: var(--transition);
}
.nav a:hover { color: var(--primary); background: var(--bg-light); }
.has-dropdown { position: relative; }
.dropdown {
    position: absolute; top: calc(100% + 8px); left: 0;
    background: #fff; min-width: 240px; border-radius: 12px;
    box-shadow: var(--shadow-hover); padding: 10px;
    opacity: 0; visibility: hidden; transform: translateY(10px);
    transition: var(--transition); z-index: 10;
}
.has-dropdown:hover .dropdown { opacity: 1; visibility: visible; transform: translateY(0); }
.dropdown li a { padding: 10px 14px; font-size: 14px; border-radius: 8px; }
.dropdown li a:hover { background: var(--bg-light); color: var(--primary); }

.mobile-menu-toggle { display: none; font-size: 24px; color: var(--primary); cursor: pointer; }

/* ===== Buttons ===== */
.btn {
    display: inline-flex; align-items: center; gap: 8px;
    padding: 13px 28px; border-radius: 10px; font-size: 15px;
    font-weight: 600; border: none; cursor: pointer;
    transition: var(--transition); white-space: nowrap;
}
.btn-primary { background: linear-gradient(135deg, var(--primary), var(--primary-light)); color: #fff; box-shadow: 0 6px 18px rgba(10,76,154,0.3); }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 10px 26px rgba(10,76,154,0.4); }
.btn-ghost { background: rgba(255,255,255,0.15); color: #fff; border: 1px solid rgba(255,255,255,0.6); }
.btn-ghost:hover { background: #fff; color: var(--primary); }
.btn-outline { background: transparent; color: var(--primary); border: 2px solid var(--primary); }
.btn-outline:hover { background: var(--primary); color: #fff; }
.btn-large { padding: 15px 34px; font-size: 16px; }

/* ===== Hero ===== */
.hero {
    position: relative; min-height: 600px; display: flex; align-items: center;
    overflow: hidden; color: #fff;
}
.hero-bg {
    position: absolute; inset: 0;
    background:
        radial-gradient(circle at 80% 20%, rgba(77,171,247,0.35), transparent 45%),
        radial-gradient(circle at 20% 80%, rgba(47,128,237,0.25), transparent 45%),
        linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 55%, #1a6fd6 100%);
}
.hero-bg::after {
    content: ""; position: absolute; inset: 0;
    background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='120' height='120'%3E%3Cpath d='M0 60 L60 0 L120 60 L60 120 Z' fill='none' stroke='rgba(255,255,255,0.06)' stroke-width='1'/%3E%3C/svg%3E") repeat;
}
.hero-content { position: relative; max-width: 720px; }
.hero-badge {
    display: inline-flex; align-items: center; gap: 8px;
    background: rgba(255,255,255,0.15); border: 1px solid rgba(255,255,255,0.3);
    padding: 8px 18px; border-radius: 30px; font-size: 14px; margin-bottom: 24px;
    backdrop-filter: blur(4px);
}
.hero h1 { font-size: 46px; font-weight: 800; line-height: 1.25; margin-bottom: 20px; }
.hero-sub { font-size: 18px; color: rgba(255,255,255,0.9); margin-bottom: 32px; }
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }
.hero-scroll {
    position: absolute; bottom: 28px; left: 50%; transform: translateX(-50%);
    color: rgba(255,255,255,0.7); font-size: 22px; animation: bounce 2s infinite;
}
@keyframes bounce { 0,100%{transform:translate(-50%,0);} 50%{transform:translate(-50%,10px);} }

/* ===== Section Header ===== */
.section-header { text-align: center; margin-bottom: 50px; }
.section-eyebrow { font-size: 13px; letter-spacing: 3px; color: var(--primary-light); font-weight: 600; text-transform: uppercase; }
.section-header h2 { font-size: 32px; color: var(--primary-dark); margin: 10px 0 12px; font-weight: 700; }
.section-header p { color: var(--text-light); font-size: 16px; }

/* ===== Advantages ===== */
.advantages { padding: 90px 0; background: var(--bg-white); }
.adv-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 26px; }
.adv-card {
    background: var(--bg-gradient); border: 1px solid var(--border);
    border-radius: 16px; padding: 36px 26px; text-align: center;
    transition: var(--transition); box-shadow: var(--shadow);
}
.adv-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-hover); border-color: var(--accent); }
.adv-icon {
    width: 68px; height: 68px; margin: 0 auto 18px; border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    color: #fff; font-size: 28px; display: flex; align-items: center; justify-content: center;
}
.adv-card h3 { font-size: 18px; color: var(--primary-dark); margin-bottom: 10px; }
.adv-card p { font-size: 14px; color: var(--text-light); }

/* ===== Product Preview ===== */
.product-preview { padding: 90px 0; background: var(--bg-light); }
.product-preview-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.pp-card {
    background: #fff; border-radius: 14px; padding: 30px 24px;
    box-shadow: var(--shadow); transition: var(--transition);
    border: 1px solid transparent; display: block;
}
.pp-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-hover); border-color: var(--primary); }
.pp-icon {
    width: 56px; height: 56px; border-radius: 12px;
    background: linear-gradient(135deg, #eaf2fb, #dcebff); color: var(--primary);
    display: flex; align-items: center; justify-content: center; font-size: 24px; margin-bottom: 16px;
}
.pp-card h3 { font-size: 17px; color: var(--primary-dark); margin-bottom: 6px; }
.pp-card p { font-size: 13px; color: var(--text-lighter); }

/* ===== CTA ===== */
.cta-section {
    background: linear-gradient(135deg, var(--primary-dark), var(--primary), var(--primary-light));
    color: #fff; padding: 70px 0; text-align: center; position: relative; overflow: hidden;
}
.cta-section::before {
    content: ""; position: absolute; inset: 0;
    background: radial-gradient(circle at 50% 50%, rgba(255,255,255,0.08), transparent 60%);
}
.cta-content { position: relative; }
.cta-content h2 { font-size: 30px; margin-bottom: 12px; }
.cta-content p { font-size: 16px; opacity: 0.9; margin-bottom: 28px; }

/* ===== Page Banner ===== */
.page-banner {
    background: linear-gradient(135deg, var(--primary-dark), var(--primary));
    color: #fff; padding: 70px 0 60px; position: relative; overflow: hidden;
}
.page-banner::after {
    content: ""; position: absolute; right: -80px; top: -80px;
    width: 320px; height: 320px; border-radius: 50%;
    background: radial-gradient(circle, rgba(255,255,255,0.08), transparent 70%);
}
.page-banner h1 { font-size: 36px; font-weight: 700; }
.page-banner p { margin-top: 8px; opacity: 0.9; }
.breadcrumb { margin-top: 14px; font-size: 14px; opacity: 0.85; }
.breadcrumb a { color: #fff; }

/* ===== About ===== */
.about-main { padding: 80px 0; }
.about-grid { display: grid; grid-template-columns: 1.3fr 0.7fr; gap: 50px; align-items: center; }
.about-text h2 { font-size: 28px; color: var(--primary-dark); margin: 8px 0 20px; }
.about-text p { color: var(--text-light); margin-bottom: 16px; }
.about-stats { display: flex; gap: 40px; margin-top: 30px; padding-top: 26px; border-top: 1px solid var(--border); }
.about-stat b { font-size: 40px; font-weight: 800; color: var(--primary); display: block; line-height: 1; }
.about-stat span { font-size: 14px; color: var(--text-lighter); }
.about-visual .about-card {
    background: linear-gradient(135deg, var(--primary-dark), var(--primary), var(--primary-light));
    color: #fff; border-radius: 20px; padding: 60px 30px; text-align: center;
    box-shadow: var(--shadow-hover); position: relative; overflow: hidden;
}
.about-visual .about-card::before {
    content: ""; position: absolute; inset: 0;
    background: radial-gradient(circle at 70% 30%, rgba(255,255,255,0.12), transparent 50%);
}
.about-visual i { font-size: 56px; margin-bottom: 18px; position: relative; }
.about-visual h3 { font-size: 22px; position: relative; }
.about-visual p { opacity: 0.8; font-size: 12px; letter-spacing: 1px; margin-top: 8px; position: relative; }

/* ===== Timeline ===== */
.timeline-section { padding: 60px 0 90px; background: var(--bg-light); }
.timeline { max-width: 820px; margin: 0 auto; position: relative; padding-left: 40px; }
.timeline::before { content: ""; position: absolute; left: 8px; top: 0; bottom: 0; width: 3px; background: linear-gradient(var(--primary), var(--accent)); }
.timeline-item { position: relative; margin-bottom: 36px; }
.timeline-item::before {
    content: ""; position: absolute; left: -36px; top: 4px;
    width: 18px; height: 18px; border-radius: 50%;
    background: #fff; border: 4px solid var(--primary); box-shadow: var(--shadow);
}
.timeline-year { font-size: 22px; font-weight: 800; color: var(--primary); }
.timeline-body h4 { font-size: 17px; color: var(--text); margin: 4px 0; }
.timeline-body p { color: var(--text-light); font-size: 14px; }

/* ===== Cert ===== */
.cert-section { padding: 80px 0; background: var(--bg-white); }
.cert-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.cert-item {
    background: var(--bg-gradient); border: 1px solid var(--border);
    border-radius: 14px; padding: 34px 20px; text-align: center;
    transition: var(--transition); box-shadow: var(--shadow);
}
.cert-item:hover { transform: translateY(-5px); box-shadow: var(--shadow-hover); }
.cert-item i { font-size: 38px; color: var(--primary); margin-bottom: 14px; }
.cert-item h4 { font-size: 15px; color: var(--primary-dark); }

/* ===== Product Nav ===== */
.product-nav { padding: 30px 0; background: var(--bg-light); border-bottom: 1px solid var(--border); }
.product-nav-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(190px, 1fr)); gap: 12px; }
.product-nav-item {
    display: flex; align-items: center; gap: 10px; padding: 12px 16px;
    background: #fff; border-radius: 10px; box-shadow: var(--shadow);
    color: var(--text); font-size: 14px; transition: var(--transition);
}
.product-nav-item i { color: var(--primary); font-size: 17px; }
.product-nav-item:hover { background: var(--primary); color: #fff; transform: translateY(-2px); }
.product-nav-item:hover i { color: #fff; }

.products-page { padding: 60px 0 80px; }
.product-detail-section { margin-bottom: 50px; padding-bottom: 40px; border-bottom: 1px solid var(--border); scroll-margin-top: 100px; }
.product-detail-section:last-child { border-bottom: none; }
.product-category-header { display: flex; align-items: center; gap: 15px; margin-bottom: 15px; }
.product-category-header i { font-size: 30px; color: var(--primary-light); }
.product-category-header h2 { color: var(--primary-dark); font-size: 22px; font-weight: 700; }
.product-desc-box { background: var(--bg-light); padding: 24px 28px; border-radius: 12px; margin: 15px 0; border: 1px solid var(--border); }
.product-desc-box h4 { color: var(--primary); margin-bottom: 10px; font-size: 15px; }
.product-desc-box p, .product-desc-box li { color: var(--text-light); font-size: 14px; line-height: 1.8; }
.product-desc-box ul { padding-left: 18px; }
.product-desc-box ul li { list-style: disc; }

.spec-table { width: 100%; border-collapse: collapse; margin: 15px 0; font-size: 13px; }
.spec-table th { background: linear-gradient(135deg, var(--primary), var(--primary-light)); color: #fff; padding: 11px 8px; text-align: center; font-weight: 500; }
.spec-table td { padding: 9px 8px; border-bottom: 1px solid var(--border); text-align: center; }
.spec-table tr:nth-child(even) td { background: rgba(244,248,253,0.6); }
.spec-table tr:hover td { background: rgba(47,128,237,0.06); }

/* ===== Contact ===== */
.contact-main { padding: 80px 0; }
.contact-grid { display: grid; grid-template-columns: 1fr 1.2fr; gap: 50px; }
.contact-info-panel h2, .contact-form-panel h2 { font-size: 26px; color: var(--primary-dark); margin: 8px 0 24px; }
.contact-list { display: flex; flex-direction: column; gap: 22px; }
.contact-item { display: flex; gap: 16px; align-items: flex-start; }
.contact-icon {
    width: 46px; height: 46px; border-radius: 12px; flex-shrink: 0;
    background: linear-gradient(135deg, #eaf2fb, #dcebff); color: var(--primary);
    display: flex; align-items: center; justify-content: center; font-size: 18px;
}
.contact-item h4 { font-size: 14px; color: var(--text-lighter); font-weight: 500; }
.contact-item p { font-size: 15px; color: var(--text); font-weight: 500; }

.contact-form-panel { background: var(--bg-gradient); border: 1px solid var(--border); border-radius: 18px; padding: 36px; box-shadow: var(--shadow); }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.form-group { margin-bottom: 18px; }
.form-group label { display: block; font-size: 14px; color: var(--text); margin-bottom: 7px; font-weight: 500; }
.form-group input, .form-group select, .form-group textarea {
    width: 100%; padding: 12px 14px; border: 1px solid var(--border); border-radius: 10px;
    font-size: 14px; font-family: inherit; color: var(--text); background: #fff;
    transition: var(--transition);
}
.form-group input:focus, .form-group select:focus, .form-group textarea:focus {
    outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px rgba(47,128,237,0.12);
}
.contact-form .btn { width: 100%; justify-content: center; margin-top: 8px; }

.offices { padding: 40px 0 90px; background: var(--bg-light); }
.office-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; max-width: 700px; margin: 0 auto; }
.office-card {
    background: #fff; border-radius: 14px; padding: 30px; text-align: center;
    box-shadow: var(--shadow); transition: var(--transition); border: 1px solid var(--border);
}
.office-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-hover); border-color: var(--primary); }
.office-card i { font-size: 34px; color: var(--primary); margin-bottom: 14px; }
.office-card h4 { color: var(--primary-dark); font-size: 17px; margin-bottom: 6px; }
.office-card p { color: var(--text-light); font-size: 14px; }

/* ===== Footer ===== */
.footer { background: linear-gradient(180deg, var(--primary-dark), #031f42); color: rgba(255,255,255,0.8); padding: 60px 0 0; }
.footer-grid { display: grid; grid-template-columns: 1.6fr 1fr 1fr 1.2fr; gap: 40px; padding-bottom: 40px; }
.footer-logo { display: flex; align-items: center; gap: 12px; font-size: 20px; font-weight: 700; color: #fff; margin-bottom: 16px; }
.footer-logo .logo-mark { width: 40px; height: 40px; font-size: 16px; }
.footer p { font-size: 14px; }
.footer-col h4 { color: #fff; font-size: 16px; margin-bottom: 18px; position: relative; padding-bottom: 10px; }
.footer-col h4::after { content: ""; position: absolute; left: 0; bottom: 0; width: 36px; height: 3px; background: var(--accent); border-radius: 2px; }
.footer-col ul li { margin-bottom: 10px; }
.footer-col ul li a { font-size: 14px; color: rgba(255,255,255,0.7); transition: var(--transition); }
.footer-col ul li a:hover { color: #fff; padding-left: 4px; }
.contact-info li { display: flex; gap: 10px; align-items: flex-start; }
.contact-info li i { color: var(--accent); margin-top: 4px; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,0.1); padding: 20px 0; text-align: center; font-size: 13px; color: rgba(255,255,255,0.5); }
.social-links { margin-top: 20px; display: flex; gap: 12px; }
.social-links .social-placeholder {
    width: 36px; height: 36px; border-radius: 50%;
    background: rgba(255,255,255,0.08); display: flex; align-items: center; justify-content: center;
    font-size: 16px; color: rgba(255,255,255,0.5); cursor: default;
}

/* ===== Responsive ===== */
@media (max-width: 960px) {
    .nav { display: none; }
    .mobile-menu-toggle { display: block; }
    .nav.open { display: block; position: absolute; top: 76px; left: 0; right: 0; background: #fff; padding: 20px; box-shadow: var(--shadow); }
    .nav.open ul { flex-direction: column; gap: 4px; }
    .nav.open .dropdown { position: static; box-shadow: none; opacity: 1; visibility: visible; transform: none; padding-left: 16px; }
    .adv-grid { grid-template-columns: repeat(2, 1fr); }
    .product-preview-grid { grid-template-columns: repeat(2, 1fr); }
    .cert-grid { grid-template-columns: repeat(2, 1fr); }
    .about-grid, .contact-grid { grid-template-columns: 1fr; }
    .footer-grid { grid-template-columns: repeat(2, 1fr); }
    .hero h1 { font-size: 34px; }
}
@media (max-width: 560px) {
    .adv-grid, .product-preview-grid, .cert-grid, .footer-grid, .office-grid { grid-template-columns: 1fr; }
    .form-row { grid-template-columns: 1fr; }
    .hero h1 { font-size: 28px; }
    .section-header h2 { font-size: 24px; }
    .about-stats { gap: 24px; }
}

/* ===== Toast ===== */
.toast {
    position: fixed; bottom: 36px; left: 50%; transform: translateX(-50%) translateY(20px);
    background: #fff; color: var(--text); padding: 14px 26px; border-radius: 12px;
    box-shadow: 0 10px 40px rgba(0,0,0,0.15); font-size: 15px; z-index: 9999;
    opacity: 0; transition: all 0.3s ease; border-left: 4px solid var(--primary);
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }
.toast-success { border-left-color: #22b07d; }
.toast-error { border-left-color: #e05263; }