/* ================= 全局重置 ================= */
* { margin: 0; padding: 0; box-sizing: border-box; }
body {
    font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
    color: #1E293B;
    background: #ffffff;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}
a { text-decoration: none; color: inherit; }
ul { list-style: none; }
img { max-width: 100%; display: block; }

:root {
    --navy: #1E3A8A;
    --sky: #0EA5E9;
    --orange: #F59E0B;
    --slate-900: #0F172A;
    --slate-600: #475569;
    --slate-400: #94A3B8;
    --slate-100: #F1F5F9;
    --white: #ffffff;
}

/* ================= 导航 ================= */
.navbar {
    position: fixed; top: 0; left: 0; right: 0; height: 72px;
    background: rgba(255,255,255,0.95); backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--slate-100);
    z-index: 1000; display: flex; align-items: center; justify-content: space-between;
    padding: 0 48px;
}
.nav-brand { display: flex; align-items: center; gap: 12px; }
.nav-logo {
    width: 40px; height: 40px; background: var(--navy); color: white; border-radius: 50%;
    display: flex; align-items: center; justify-content: center;
    font-weight: 900; font-size: 12px;
}
.nav-brand-text { font-size: 20px; font-weight: 800; color: var(--navy); letter-spacing: 0.5px; }
.nav-tagline { font-size: 9px; color: var(--slate-400); display: block; margin-top: -2px; }
.nav-links { display: flex; gap: 36px; font-size: 13px; font-weight: 600; color: var(--slate-600); }
.nav-links a { transition: color 0.2s; }
.nav-links a:hover, .nav-links a.active { color: var(--navy); }
.nav-cta {
    background: var(--orange); color: white; padding: 10px 22px; border-radius: 6px;
    font-size: 12px; font-weight: 700; transition: background 0.2s;
}
.nav-cta:hover { background: #D97706; }
.mobile-menu-btn { display: none; font-size: 24px; cursor: pointer; color: var(--navy); }

/* ================= 通用区块 ================= */
.section { padding: 100px 48px; max-width: 1200px; margin: 0 auto; }
.section-label { font-size: 11px; font-weight: 700; color: var(--sky); letter-spacing: 2px; text-transform: uppercase; margin-bottom: 12px; }
.section-title { font-size: 36px; font-weight: 800; color: var(--slate-900); line-height: 1.2; margin-bottom: 16px; }
.section-desc { font-size: 15px; color: var(--slate-600); max-width: 600px; line-height: 1.8; }

/* ================= 按钮 ================= */
.btn-primary { background: var(--orange); color: white; padding: 14px 32px; border-radius: 6px; font-size: 14px; font-weight: 700; transition: all 0.2s; display: inline-block; cursor: pointer; border: none; }
.btn-primary:hover { background: #D97706; transform: translateY(-1px); }
.btn-ghost { border: 1px solid rgba(255,255,255,0.3); color: white; padding: 14px 32px; border-radius: 6px; font-size: 14px; font-weight: 600; transition: all 0.2s; display: inline-block; cursor: pointer; }
.btn-ghost:hover { border-color: white; background: rgba(255,255,255,0.05); }
.btn-navy { background: var(--navy); color: white; padding: 14px 32px; border-radius: 6px; font-size: 14px; font-weight: 700; transition: all 0.2s; display: inline-block; cursor: pointer; border: none; }
.btn-navy:hover { background: #1E40AF; }

/* ================= 首页 Hero ================= */
.hero {
    margin-top: 72px; height: calc(100vh - 72px); min-height: 600px;
    background: linear-gradient(135deg, #0F172A 0%, #1E3A8A 60%, #1E40AF 100%);
    display: flex; align-items: center; position: relative; overflow: hidden;
}
.hero::before { content: ''; position: absolute; top: -20%; right: -10%; width: 600px; height: 600px; border: 1px solid rgba(255,255,255,0.08); border-radius: 50%; }
.hero::after { content: ''; position: absolute; bottom: -30%; left: -5%; width: 500px; height: 500px; border: 1px solid rgba(255,255,255,0.06); border-radius: 50%; }
.hero-inner { max-width: 1200px; margin: 0 auto; padding: 0 48px; display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; position: relative; z-index: 2; width: 100%; }
.hero-left .hero-brand { font-size: 56px; font-weight: 900; color: white; letter-spacing: 2px; line-height: 1.1; }
.hero-left .hero-sub { font-size: 18px; color: rgba(255,255,255,0.75); margin-top: 12px; }
.hero-left .hero-desc { font-size: 15px; color: rgba(255,255,255,0.6); margin-top: 28px; max-width: 480px; line-height: 1.8; }
.hero-actions { margin-top: 40px; display: flex; gap: 16px; }
.hero-stats { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
.stat-card { background: rgba(255,255,255,0.06); border: 1px solid rgba(255,255,255,0.1); border-radius: 10px; padding: 28px 24px; backdrop-filter: blur(8px); }
.stat-number { font-size: 36px; font-weight: 900; color: white; }
.stat-number span { font-size: 20px; color: var(--orange); }
.stat-label { font-size: 11px; color: rgba(255,255,255,0.55); margin-top: 8px; text-transform: uppercase; }

/* ================= 产品卡片 ================= */
.products-section { background: var(--slate-100); padding: 100px 48px; }
.products-inner { max-width: 1200px; margin: 0 auto; }
.products-header { display: flex; justify-content: space-between; align-items: flex-end; margin-bottom: 48px; }
.products-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.product-card { background: white; border-radius: 10px; overflow: hidden; transition: all 0.3s; cursor: pointer; border: 1px solid transparent; display: block; }
.product-card:hover { transform: translateY(-4px); box-shadow: 0 20px 40px rgba(0,0,0,0.08); border-color: var(--sky); }
.product-img { height: 200px; background: linear-gradient(135deg, #E2E8F0 0%, #F1F5F9 100%); display: flex; align-items: center; justify-content: center; position: relative; overflow: hidden; }
.product-img::after { content: ''; position: absolute; width: 120px; height: 120px; border: 2px solid rgba(14,165,233,0.15); border-radius: 50%; top: 50%; left: 50%; transform: translate(-50%, -50%); }
.product-img-icon { font-size: 48px; opacity: 0.3; position: relative; z-index: 1; }
.product-info { padding: 20px 24px 24px; }
.product-name { font-size: 17px; font-weight: 700; color: var(--slate-900); }
.product-name-en { font-size: 11px; color: var(--slate-400); margin-top: 2px; }
.product-specs { margin-top: 12px; display: flex; flex-wrap: wrap; gap: 6px; }
.spec-tag { font-size: 10px; background: var(--slate-100); color: var(--slate-600); padding: 3px 10px; border-radius: 20px; font-weight: 500; }
.product-cta { margin-top: 16px; font-size: 12px; font-weight: 700; color: var(--sky); display: flex; align-items: center; gap: 6px; }
.product-cta::after { content: '→'; transition: transform 0.2s; }
.product-card:hover .product-cta::after { transform: translateX(4px); }

/* ================= 询盘表单 ================= */
.inquiry-section { background: white; padding: 100px 48px; }
.inquiry-inner { max-width: 1200px; margin: 0 auto; display: grid; grid-template-columns: 1fr 1fr; gap: 80px; align-items: start; }
.inquiry-left .section-title { font-size: 32px; }
.inquiry-left .section-desc { margin-bottom: 32px; }
.inquiry-benefits { display: flex; flex-direction: column; gap: 16px; margin-top: 32px; }
.benefit-item { display: flex; align-items: flex-start; gap: 12px; font-size: 14px; color: var(--slate-600); }
.benefit-icon { width: 22px; height: 22px; background: var(--slate-100); border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 11px; color: var(--sky); flex-shrink: 0; margin-top: 1px; font-weight: 700; }
.inquiry-form { background: var(--slate-100); border-radius: 12px; padding: 40px; border: 1px solid #E2E8F0; }
.form-title { font-size: 18px; font-weight: 700; color: var(--slate-900); margin-bottom: 6px; }
.form-sub { font-size: 12px; color: var(--slate-400); margin-bottom: 28px; }
.form-group { margin-bottom: 18px; }
.form-group label { display: block; font-size: 11px; font-weight: 700; color: var(--slate-600); letter-spacing: 0.5px; text-transform: uppercase; margin-bottom: 6px; }
.form-group input, .form-group select, .form-group textarea { width: 100%; padding: 12px 14px; border: 1px solid #CBD5E1; border-radius: 6px; font-size: 14px; font-family: inherit; color: var(--slate-900); background: white; transition: border-color 0.2s; outline: none; }
.form-group input:focus, .form-group select:focus, .form-group textarea:focus { border-color: var(--sky); box-shadow: 0 0 0 3px rgba(14,165,233,0.1); }
.form-group textarea { resize: vertical; min-height: 100px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.form-submit { width: 100%; padding: 15px; background: var(--navy); color: white; border: none; border-radius: 6px; font-size: 14px; font-weight: 700; cursor: pointer; transition: background 0.2s; font-family: inherit; margin-top: 6px; }
.form-submit:hover { background: #1E40AF; }
.form-submit:disabled { opacity: 0.7; cursor: not-allowed; }
.form-note { font-size: 11px; color: var(--slate-400); margin-top: 14px; text-align: center; }

/* ================= 信任区 ================= */
.trust-section { background: var(--slate-100); padding: 80px 48px; }
.trust-inner { max-width: 1200px; margin: 0 auto; display: grid; grid-template-columns: repeat(4, 1fr); gap: 32px; text-align: center; }
.trust-item { padding: 24px; }
.trust-icon { font-size: 32px; margin-bottom: 12px; display: block; }
.trust-title { font-size: 14px; font-weight: 700; color: var(--slate-900); margin-bottom: 6px; }
.trust-desc { font-size: 12px; color: var(--slate-600); line-height: 1.6; }

/* ================= 页脚 ================= */
.footer { background: var(--slate-900); color: rgba(255,255,255,0.6); padding: 60px 48px 32px; }
.footer-inner { max-width: 1200px; margin: 0 auto; display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 48px; padding-bottom: 40px; border-bottom: 1px solid rgba(255,255,255,0.08); }
.footer-brand { font-size: 20px; font-weight: 800; color: white; margin-bottom: 12px; }
.footer-brand-sub { font-size: 10px; color: rgba(255,255,255,0.35); display: block; margin-top: -4px; margin-bottom: 16px; }
.footer-desc { font-size: 13px; line-height: 1.8; max-width: 300px; }
.footer-col h4 { font-size: 12px; font-weight: 700; color: white; letter-spacing: 1px; text-transform: uppercase; margin-bottom: 16px; }
.footer-col ul li { margin-bottom: 10px; font-size: 13px; }
.footer-col ul li a { transition: color 0.2s; }
.footer-col ul li a:hover { color: white; }
.footer-bottom { max-width: 1200px; margin: 0 auto; padding-top: 24px; display: flex; justify-content: space-between; font-size: 11px; color: rgba(255,255,255,0.3); flex-wrap: wrap; gap: 8px; }
.footer-bottom a { color: rgba(255,255,255,0.5); }
.footer-bottom a:hover { color: white; }

/* ================= 内页 Hero ================= */
.page-hero { margin-top: 72px; padding: 80px 48px 60px; background: linear-gradient(135deg, #0F172A 0%, #1E3A8A 100%); text-align: center; }
.page-hero h1 { font-size: 44px; font-weight: 900; color: white; letter-spacing: 1px; }
.page-hero p { font-size: 16px; color: rgba(255,255,255,0.6); margin-top: 12px; max-width: 600px; margin-left: auto; margin-right: auto; }

/* ================= 产品筛选 ================= */
.filter-bar { max-width: 1200px; margin: -28px auto 0; padding: 0 48px; position: relative; z-index: 5; }
.filter-inner { background: white; border-radius: 10px; padding: 20px 28px; box-shadow: 0 10px 30px rgba(0,0,0,0.08); display: flex; gap: 10px; flex-wrap: wrap; align-items: center; }
.filter-btn { padding: 8px 18px; border-radius: 20px; font-size: 12px; font-weight: 600; border: 1px solid #E2E8F0; background: white; color: var(--slate-600); cursor: pointer; transition: all 0.2s; font-family: inherit; }
.filter-btn:hover { border-color: var(--sky); color: var(--sky); }
.filter-btn.active { background: var(--navy); color: white; border-color: var(--navy); }

/* ================= 产品详情 ================= */
.detail-section { padding: 120px 48px 100px; max-width: 1200px; margin: 0 auto; }
.breadcrumb { font-size: 12px; color: var(--slate-400); margin-bottom: 32px; }
.breadcrumb a { transition: color 0.2s; }
.breadcrumb a:hover { color: var(--sky); }
.detail-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: start; }
.detail-gallery-main { background: linear-gradient(135deg, #E2E8F0 0%, #F1F5F9 100%); border-radius: 12px; height: 420px; display: flex; align-items: center; justify-content: center; position: relative; overflow: hidden; border: 1px solid #E2E8F0; }
.detail-gallery-main::after { content: ''; position: absolute; width: 200px; height: 200px; border: 2px solid rgba(14,165,233,0.15); border-radius: 50%; top: 50%; left: 50%; transform: translate(-50%, -50%); }
.detail-gallery-main span { font-size: 80px; opacity: 0.25; position: relative; z-index: 1; }
.detail-thumbs { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; margin-top: 12px; }
.detail-thumb { height: 80px; background: var(--slate-100); border-radius: 8px; display: flex; align-items: center; justify-content: center; font-size: 28px; opacity: 0.4; cursor: pointer; transition: all 0.2s; border: 2px solid transparent; }
.detail-thumb:hover, .detail-thumb.active { border-color: var(--sky); opacity: 0.7; }
.detail-info h1 { font-size: 32px; font-weight: 800; color: var(--slate-900); line-height: 1.2; }
.detail-info .detail-sub { font-size: 14px; color: var(--slate-400); margin-top: 6px; }
.detail-spec-table { margin-top: 28px; border: 1px solid #E2E8F0; border-radius: 10px; overflow: hidden; }
.spec-row { display: grid; grid-template-columns: 120px 1fr; border-bottom: 1px solid #E2E8F0; font-size: 13px; }
.spec-row:last-child { border-bottom: none; }
.spec-row .spec-key { background: var(--slate-100); padding: 12px 16px; font-weight: 700; color: var(--slate-600); }
.spec-row .spec-val { padding: 12px 16px; color: var(--slate-900); }
.detail-actions { margin-top: 28px; display: flex; gap: 12px; flex-wrap: wrap; }

/* ================= 关于我们 ================= */
.about-intro { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; }
.about-image { background: linear-gradient(135deg, #1E3A8A 0%, #0EA5E9 100%); border-radius: 12px; height: 400px; display: flex; align-items: center; justify-content: center; color: white; font-size: 80px; position: relative; overflow: hidden; }
.about-image::after { content: ''; position: absolute; width: 300px; height: 300px; border: 2px solid rgba(255,255,255,0.1); border-radius: 50%; top: 50%; left: 50%; transform: translate(-50%, -50%); }
.about-image span { position: relative; z-index: 1; }
.about-stats-row { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; margin-top: 40px; }
.about-stat { text-align: center; padding: 24px; background: white; border-radius: 10px; border: 1px solid #E2E8F0; }
.about-stat .num { font-size: 32px; font-weight: 900; color: var(--navy); }
.about-stat .num span { color: var(--orange); font-size: 18px; }
.about-stat .lbl { font-size: 11px; color: var(--slate-400); text-transform: uppercase; margin-top: 6px; }

/* 时间线 */
.timeline { position: relative; max-width: 800px; margin: 0 auto; padding-left: 40px; }
.timeline::before { content: ''; position: absolute; left: 8px; top: 0; bottom: 0; width: 2px; background: #E2E8F0; }
.timeline-item { position: relative; margin-bottom: 36px; }
.timeline-item::before { content: ''; position: absolute; left: -36px; top: 6px; width: 14px; height: 14px; border-radius: 50%; background: var(--sky); border: 3px solid white; box-shadow: 0 0 0 2px var(--sky); }
.timeline-year { font-size: 13px; font-weight: 800; color: var(--sky); letter-spacing: 1px; }
.timeline-text { font-size: 14px; color: var(--slate-600); margin-top: 4px; line-height: 1.7; }

/* ================= 质量控制 ================= */
.qc-flow { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; margin-top: 48px; }
.qc-step { background: white; border: 1px solid #E2E8F0; border-radius: 10px; padding: 28px 20px; text-align: center; transition: all 0.3s; }
.qc-step:hover { border-color: var(--sky); transform: translateY(-3px); box-shadow: 0 12px 24px rgba(0,0,0,0.06); }
.qc-step-num { width: 36px; height: 36px; border-radius: 50%; background: var(--navy); color: white; display: flex; align-items: center; justify-content: center; font-weight: 800; font-size: 14px; margin: 0 auto 16px; }
.qc-step-title { font-size: 14px; font-weight: 700; color: var(--slate-900); margin-bottom: 8px; }
.qc-step-desc { font-size: 12px; color: var(--slate-600); line-height: 1.6; }
.cert-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; margin-top: 48px; }
.cert-item { background: var(--slate-100); border-radius: 10px; padding: 28px 20px; text-align: center; border: 1px solid #E2E8F0; transition: all 0.2s; }
.cert-item:hover { background: white; border-color: var(--sky); }
.cert-icon { font-size: 36px; margin-bottom: 12px; }
.cert-name { font-size: 13px; font-weight: 700; color: var(--slate-900); }
.cert-desc { font-size: 11px; color: var(--slate-400); margin-top: 4px; }

/* ================= 联系我们 ================= */
.contact-grid { display: grid; grid-template-columns: 1fr 1.2fr; gap: 60px; align-items: start; }
.contact-info-item { display: flex; gap: 16px; margin-bottom: 28px; }
.contact-icon { width: 44px; height: 44px; background: var(--slate-100); border-radius: 10px; display: flex; align-items: center; justify-content: center; font-size: 20px; flex-shrink: 0; }
.contact-info-label { font-size: 11px; font-weight: 700; color: var(--slate-400); text-transform: uppercase; letter-spacing: 0.5px; }
.contact-info-value { font-size: 14px; color: var(--slate-900); font-weight: 500; margin-top: 4px; line-height: 1.6; }
.contact-info-value a { color: var(--sky); }

/* FAQ */
.faq-list { margin-top: 48px; }
.faq-item { border-bottom: 1px solid #E2E8F0; padding: 20px 0; }
.faq-q { font-size: 15px; font-weight: 700; color: var(--slate-900); cursor: pointer; display: flex; justify-content: space-between; align-items: center; }
.faq-q::after { content: '+'; font-size: 20px; color: var(--sky); transition: transform 0.2s; }
.faq-item.open .faq-q::after { transform: rotate(45deg); }
.faq-a { font-size: 13px; color: var(--slate-600); line-height: 1.8; max-height: 0; overflow: hidden; transition: max-height 0.3s ease, margin 0.3s; }
.faq-item.open .faq-a { max-height: 300px; margin-top: 12px; }

/* ================= CTA 横幅 ================= */
.cta-banner { background: linear-gradient(135deg, #1E3A8A 0%, #0EA5E9 100%); padding: 80px 48px; text-align: center; }
.cta-banner h2 { font-size: 32px; font-weight: 800; color: white; margin-bottom: 12px; }
.cta-banner p { font-size: 15px; color: rgba(255,255,255,0.7); margin-bottom: 32px; }

/* ================= 法律页面 ================= */
.legal-content { max-width: 800px; margin: 0 auto; padding: 120px 48px 80px; }
.legal-content h1 { font-size: 32px; font-weight: 800; color: var(--slate-900); margin-bottom: 8px; }
.legal-content .legal-date { font-size: 13px; color: var(--slate-400); margin-bottom: 40px; }
.legal-content h2 { font-size: 20px; font-weight: 700; color: var(--slate-900); margin-top: 36px; margin-bottom: 12px; }
.legal-content p, .legal-content li { font-size: 14px; color: var(--slate-600); line-height: 1.9; margin-bottom: 12px; }
.legal-content ul { padding-left: 24px; list-style: disc; }
.legal-content a { color: var(--sky); }

/* ================= Cookie 横幅 ================= */
.cookie-banner { position: fixed; bottom: 0; left: 0; right: 0; background: var(--slate-900); color: white; padding: 16px 48px; display: flex; align-items: center; justify-content: space-between; gap: 24px; z-index: 2000; font-size: 13px; transform: translateY(100%); transition: transform 0.3s; }
.cookie-banner.show { transform: translateY(0); }
.cookie-banner a { color: var(--sky); text-decoration: underline; }
.cookie-banner button { background: var(--orange); color: white; border: none; padding: 10px 24px; border-radius: 6px; font-size: 12px; font-weight: 700; cursor: pointer; font-family: inherit; flex-shrink: 0; }
.cookie-banner button:hover { background: #D97706; }

/* ================= 响应式 ================= */
@media (max-width: 1024px) {
    .hero-inner { grid-template-columns: 1fr; gap: 40px; }
    .hero-left .hero-brand { font-size: 40px; }
    .products-grid { grid-template-columns: repeat(2, 1fr); }
    .inquiry-inner { grid-template-columns: 1fr; gap: 48px; }
    .trust-inner { grid-template-columns: repeat(2, 1fr); }
    .footer-inner { grid-template-columns: 1fr 1fr; }
    .nav-links { display: none; }
    .mobile-menu-btn { display: block; }
    .detail-grid { grid-template-columns: 1fr; gap: 40px; }
    .about-intro { grid-template-columns: 1fr; gap: 40px; }
    .qc-flow, .cert-grid { grid-template-columns: repeat(2, 1fr); }
    .contact-grid { grid-template-columns: 1fr; gap: 48px; }
    .filter-bar { padding: 0 20px; }
    .cookie-banner { padding: 16px 20px; flex-direction: column; text-align: center; }
}
@media (max-width: 640px) {
    .navbar { padding: 0 20px; }
    .section, .products-section, .inquiry-section, .trust-section { padding: 60px 20px; }
    .hero-inner { padding: 0 20px; }
    .hero-left .hero-brand { font-size: 32px; }
    .products-grid { grid-template-columns: 1fr; }
    .form-row { grid-template-columns: 1fr; }
    .trust-inner { grid-template-columns: 1fr; }
    .footer-inner { grid-template-columns: 1fr; }
    .products-header { flex-direction: column; align-items: flex-start; gap: 16px; }
    .page-hero h1 { font-size: 28px; }
    .page-hero { padding: 60px 20px 40px; }
    .qc-flow, .cert-grid { grid-template-columns: 1fr; }
    .about-stats-row { grid-template-columns: 1fr; }
    .detail-section { padding: 100px 20px 60px; }
    .about-image { height: 260px; font-size: 60px; }
    .cta-banner { padding: 60px 20px; }
    .cta-banner h2 { font-size: 24px; }
    .legal-content { padding: 100px 20px 60px; }
}