/* ========== 基础重置 ========== */
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    font-family: "Microsoft YaHei", "微软雅黑", "PingFang SC", "Helvetica Neue", Arial, sans-serif;
    color: #333;
    background: #fff;
    line-height: 1.6;
    overflow-x: hidden;
}
a { text-decoration: none; color: inherit; }
ul, ol { list-style: none; }
img { max-width: 100%; display: block; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
/* ========== 顶部信息条 ========== */
.top-bar {
    background: #1a2a3a;
    color: #b8c5d6;
    font-size: 12px;
    padding: 6px 0;
    border-bottom: 1px solid #0f1c28;
}
.top-bar .container { display: flex; justify-content: space-between; align-items: center; }
.top-bar .welcome { font-size: 12px; }
.top-bar .top-links a { color: #b8c5d6; margin-left: 18px; }
.top-bar .top-links a:hover { color: #2d8cf0; }
/* ========== 主导航 ========== */
.header {
    background: #fff;
    box-shadow: 0 2px 8px rgba(0,0,0,0.08);
    position: sticky;
    top: 0;
    z-index: 999;
}
.header .container { display: flex; align-items: center; justify-content: space-between; height: 84px; }
.logo { display: flex; align-items: center; gap: 12px; }
.logo-img-box {
    width: 52px; height: 52px;
    background: linear-gradient(135deg, #1e5fbf, #0a3a82);
    border-radius: 6px;
    display: flex; align-items: center; justify-content: center;
    color: #fff; font-size: 22px; font-weight: bold;
}
.logo-text { display: flex; flex-direction: column; }
.logo-text .cn { font-size: 22px; font-weight: bold; color: #1a2a3a; letter-spacing: 2px; }
.logo-text .en { font-size: 11px; color: #8a99ab; letter-spacing: 1px; text-transform: uppercase; }
.nav { display: flex; align-items: center; }
.nav > li > a {
    display: block;
    padding: 0 22px;
    height: 84px;
    line-height: 84px;
    font-size: 16px;
    color: #1a2a3a;
    font-weight: 500;
    position: relative;
    transition: color 0.2s;
}
.nav > li > a:hover, .nav > li.active > a { color: #1e5fbf; }
.nav > li > a::after {
    content: "";
    position: absolute;
    bottom: 0; left: 50%;
    width: 0; height: 3px;
    background: #1e5fbf;
    transition: all 0.3s;
    transform: translateX(-50%);
}
.nav > li > a:hover::after, .nav > li.active > a::after { width: 60%; }
.nav .has-sub > a::before {
    content: "▾";
    font-size: 10px;
    margin-left: 6px;
    color: #8a99ab;
}
/* 二级菜单 */
.submenu {
    position: absolute;
    top: 84px; left: 0;
    background: #fff;
    min-width: 180px;
    box-shadow: 0 6px 20px rgba(0,0,0,0.12);
    opacity: 0; visibility: hidden;
    transform: translateY(10px);
    transition: all 0.3s;
    z-index: 100;
}
.nav > li { position: relative; }
.nav > li:hover .submenu { opacity: 1; visibility: visible; transform: translateY(0); }
.submenu li a {
    display: block;
    padding: 12px 20px;
    font-size: 14px;
    color: #555;
    border-bottom: 1px solid #f0f0f0;
    transition: all 0.2s;
}
.submenu li a:hover { background: #f5f9ff; color: #1e5fbf; padding-left: 26px; }
.header-actions { display: flex; align-items: center; gap: 16px; }
.search-btn, .lang-btn {
    width: 36px; height: 36px;
    border: 1px solid #e0e0e0;
    border-radius: 50%;
    display: flex; align-items: center; justify-content: center;
    cursor: pointer;
    transition: all 0.2s;
    background: #fff;
    font-size: 14px;
    color: #1a2a3a;
}
.search-btn:hover, .lang-btn:hover { background: #1e5fbf; color: #fff; border-color: #1e5fbf; }
/* ========== Banner 轮播 ========== */
.banner {
    position: relative;
    height: 560px;
    overflow: hidden;
    background: #0a1a2e;
}
.banner-slides { position: relative; width: 100%; height: 100%; }
.banner-slide {
    position: absolute;
    top: 0; left: 0;
    width: 100%; height: 100%;
    opacity: 0;
    transition: opacity 0.8s;
    display: flex; align-items: center;
}
.banner-slide.active { opacity: 1; }
.banner-slide .slide-bg {
    position: absolute;
    top: 0; left: 0;
    width: 100%; height: 100%;
    z-index: 1;
}
.banner-slide .slide-bg::after {
    content: "";
    position: absolute;
    top: 0; left: 0;
    width: 100%; height: 100%;
    background: linear-gradient(90deg, rgba(10,26,46,0.85) 0%, rgba(10,26,46,0.4) 60%, transparent 100%);
}
.banner-content { position: relative; z-index: 2; color: #fff; max-width: 1200px; margin: 0 auto; padding: 0 20px; width: 100%; }
.banner-content .sub-title {
    font-size: 16px;
    color: #8cb8f0;
    letter-spacing: 4px;
    margin-bottom: 16px;
    text-transform: uppercase;
}
.banner-content .main-title {
    font-size: 44px;
    font-weight: bold;
    line-height: 1.3;
    margin-bottom: 24px;
    text-shadow: 0 2px 12px rgba(0,0,0,0.3);
}
.banner-content .desc {
    font-size: 18px;
    color: #c5d5e8;
    max-width: 560px;
    line-height: 1.8;
    margin-bottom: 32px;
}
.banner-btn {
    display: inline-block;
    padding: 14px 38px;
    background: #1e5fbf;
    color: #fff;
    font-size: 15px;
    border-radius: 4px;
    transition: all 0.3s;
    border: 2px solid #1e5fbf;
}
.banner-btn:hover { background: transparent; border-color: #fff; }
.banner-arrows { position: absolute; top: 50%; transform: translateY(-50%); width: 100%; z-index: 3; display: flex; justify-content: space-between; padding: 0 20px; }
.banner-arrows .arrow {
    width: 48px; height: 48px;
    background: rgba(255,255,255,0.15);
    border: 1px solid rgba(255,255,255,0.3);
    border-radius: 50%;
    display: flex; align-items: center; justify-content: center;
    color: #fff;
    cursor: pointer;
    font-size: 20px;
    transition: all 0.3s;
}
.banner-arrows .arrow:hover { background: #1e5fbf; border-color: #1e5fbf; }
.banner-dots { position: absolute; bottom: 30px; left: 50%; transform: translateX(-50%); z-index: 3; display: flex; gap: 12px; }
.banner-dots .dot {
    width: 40px; height: 3px;
    background: rgba(255,255,255,0.3);
    cursor: pointer;
    transition: all 0.3s;
}
.banner-dots .dot.active { background: #fff; }
/* ========== 通用区块标题 ========== */
.section { padding: 70px 0; }
.section-header { text-align: center; margin-bottom: 50px; }
.section-header .en-title {
    font-size: 14px;
    color: #1e5fbf;
    letter-spacing: 4px;
    text-transform: uppercase;
    margin-bottom: 10px;
    font-weight: 600;
}
.section-header .cn-title {
    font-size: 32px;
    font-weight: bold;
    color: #1a2a3a;
    margin-bottom: 16px;
}
.section-header .cn-title span { color: #1e5fbf; }
.section-header .divider {
    width: 50px; height: 3px;
    background: #1e5fbf;
    margin: 0 auto 18px;
}
.section-header .desc {
    font-size: 15px;
    color: #777;
    max-width: 720px;
    margin: 0 auto;
    line-height: 1.8;
}
/* ========== 关于粤科 ========== */
.about { background: #f7f9fc; }
.about-wrap { display: flex; gap: 50px; align-items: stretch; }
.about-media { flex: 0 0 50%; position: relative; }
.about-media img { width: 100%; height: 380px; object-fit: cover; border-radius: 4px; }
.about-media .play-btn {
    position: absolute;
    top: 50%; left: 50%;
    transform: translate(-50%,-50%);
    width: 70px; height: 70px;
    background: rgba(30,95,191,0.9);
    border-radius: 50%;
    display: flex; align-items: center; justify-content: center;
    cursor: pointer;
    transition: all 0.3s;
}
.about-media .play-btn::after {
    content: "";
    width: 0; height: 0;
    border-left: 18px solid #fff;
    border-top: 12px solid transparent;
    border-bottom: 12px solid transparent;
    margin-left: 6px;
}
.about-media .play-btn:hover { background: #1e5fbf; transform: translate(-50%,-50%) scale(1.1); }
.about-info { flex: 1; display: flex; flex-direction: column; }
.about-info .sub-en { font-size: 13px; color: #1e5fbf; letter-spacing: 3px; text-transform: uppercase; margin-bottom: 8px; }
.about-info h2 { font-size: 28px; color: #1a2a3a; margin-bottom: 20px; }
.about-info p { font-size: 14px; color: #666; line-height: 2; margin-bottom: 24px; }
.about-features { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-bottom: 24px; }
.about-feature {
    display: flex; align-items: center; gap: 12px;
    padding: 16px;
    background: #fff;
    border-radius: 4px;
    transition: all 0.3s;
    border: 1px solid #eef2f7;
}
.about-feature:hover { border-color: #1e5fbf; box-shadow: 0 4px 16px rgba(30,95,191,0.1); transform: translateY(-2px); }
.about-feature .ico {
    width: 44px; height: 44px;
    background: linear-gradient(135deg, #1e5fbf, #0a3a82);
    border-radius: 6px;
    display: flex; align-items: center; justify-content: center;
    color: #fff; font-size: 20px;
    flex-shrink: 0;
}
.about-feature .txt { font-size: 14px; color: #1a2a3a; font-weight: 600; }
.about-more {
    display: inline-block;
    align-self: flex-start;
    padding: 12px 32px;
    background: #1e5fbf;
    color: #fff;
    font-size: 14px;
    border-radius: 4px;
    transition: all 0.3s;
}
.about-more:hover { background: #0a3a82; transform: translateX(4px); }
/* ========== 产品中心 ========== */
.products { background: #fff; }
.product-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.product-card {
    background: #fff;
    border: 1px solid #eef2f7;
    border-radius: 4px;
    overflow: hidden;
    transition: all 0.3s;
    cursor: pointer;
}
.product-card:hover { box-shadow: 0 8px 30px rgba(30,95,191,0.15); transform: translateY(-4px); }
.product-card .img-wrap { height: 200px; overflow: hidden; position: relative; }
.product-card .img-wrap img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.5s; }
.product-card:hover .img-wrap img { transform: scale(1.08); }
.product-card .img-wrap::after {
    content: "";
    position: absolute;
    top: 0; left: 0;
    width: 100%; height: 100%;
    background: linear-gradient(to top, rgba(10,26,46,0.3), transparent 50%);
    opacity: 0;
    transition: opacity 0.3s;
}
.product-card:hover .img-wrap::after { opacity: 1; }
.product-card .info { padding: 16px; background: #1a2a3a; }
.product-card .info .name { font-size: 16px; color: #fff; font-weight: 600; margin-bottom: 6px; }
.product-card .info .en { font-size: 11px; color: #8a99ab; text-transform: uppercase; letter-spacing: 1px; }
/* ========== 应用领域 ========== */
.applications { background: #f7f9fc; }
.app-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 20px; }
.app-item {
    position: relative;
    height: 160px;
    overflow: hidden;
    border-radius: 4px;
    cursor: pointer;
}
.app-item img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.5s; }
.app-item:hover img { transform: scale(1.1); }
.app-item .overlay {
    position: absolute;
    top: 0; left: 0;
    width: 100%; height: 100%;
    background: linear-gradient(135deg, rgba(10,26,46,0.7), rgba(10,26,46,0.5));
    display: flex; flex-direction: column; align-items: center; justify-content: center;
    color: #fff;
    transition: all 0.3s;
}
.app-item:hover .overlay { background: linear-gradient(135deg, rgba(30,95,191,0.85), rgba(10,58,130,0.85)); }
.app-item .ico { font-size: 28px; margin-bottom: 8px; }
.app-item .name { font-size: 16px; font-weight: 600; }
.app-item .en-name { font-size: 11px; opacity: 0.8; margin-top: 4px; text-transform: uppercase; letter-spacing: 1px; }
/* ========== 新闻中心 ========== */
.news { background: #fff; }
.news-wrap { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; }
.news-featured {
    position: relative;
    overflow: hidden;
    border-radius: 4px;
    cursor: pointer;
}
.news-featured img { width: 100%; height: 320px; object-fit: cover; transition: transform 0.5s; }
.news-featured:hover img { transform: scale(1.05); }
.news-featured .overlay {
    position: absolute;
    bottom: 0; left: 0;
    width: 100%;
    padding: 24px;
    background: linear-gradient(to top, rgba(10,26,46,0.95), transparent);
    color: #fff;
}
.news-featured .date { font-size: 14px; color: #8cb8f0; margin-bottom: 8px; }
.news-featured .title { font-size: 18px; font-weight: 600; line-height: 1.5; }
.news-list { display: flex; flex-direction: column; gap: 20px; }
.news-item {
    display: flex; gap: 20px;
    padding-bottom: 20px;
    border-bottom: 1px dashed #e0e0e0;
    cursor: pointer;
    transition: all 0.2s;
}
.news-item:last-child { border-bottom: none; }
.news-item:hover .news-title { color: #1e5fbf; }
.news-date {
    flex-shrink: 0;
    width: 80px;
    text-align: center;
    border-right: 2px solid #1e5fbf;
    padding-right: 16px;
}
.news-date .day { font-size: 32px; font-weight: bold; color: #1a2a3a; line-height: 1; }
.news-date .ym { font-size: 12px; color: #999; margin-top: 4px; }
.news-content { flex: 1; }
.news-title {
    font-size: 16px;
    font-weight: 600;
    color: #1a2a3a;
    margin-bottom: 8px;
    transition: color 0.2s;
    line-height: 1.5;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}
.news-desc { font-size: 13px; color: #777; line-height: 1.7; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
/* ========== 为什么选择我们 ========== */
.why-us { background: #0f1c2e; color: #fff; padding: 70px 0; }
.why-us .section-header .cn-title { color: #fff; }
.why-us .section-header .desc { color: #b8c5d6; }
.why-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.why-card {
    text-align: center;
    padding: 36px 20px;
    background: rgba(255,255,255,0.04);
    border: 1px solid rgba(255,255,255,0.08);
    border-radius: 4px;
    transition: all 0.3s;
}
.why-card:hover { background: rgba(30,95,191,0.15); border-color: #1e5fbf; transform: translateY(-4px); }
.why-card .num { font-size: 42px; font-weight: bold; color: #1e5fbf; margin-bottom: 12px; }
.why-card .num span { font-size: 20px; }
.why-card .title { font-size: 16px; font-weight: 600; margin-bottom: 8px; }
.why-card .desc { font-size: 13px; color: #8a99ab; line-height: 1.7; }
/* ========== 客户案例 ========== */
.clients { background: #f7f9fc; }
.clients-marquee { overflow: hidden; position: relative; }
.clients-track {
    display: flex;
    gap: 30px;
    animation: marquee 30s linear infinite;
    width: max-content;
}
.clients-track:hover { animation-play-state: paused; }
@keyframes marquee {
    0% { transform: translateX(0); }
    100% { transform: translateX(-50%); }
}
.client-item {
    flex-shrink: 0;
    width: 200px; height: 100px;
    background: #fff;
    border: 1px solid #eef2f7;
    border-radius: 4px;
    display: flex; align-items: center; justify-content: center;
    font-size: 14px;
    color: #8a99ab;
    transition: all 0.3s;
}
.client-item:hover { border-color: #1e5fbf; color: #1e5fbf; box-shadow: 0 4px 16px rgba(30,95,191,0.1); }
/* ========== CTA 区块 ========== */
.cta-band {
    background: linear-gradient(135deg, #0a3a82, #1e5fbf);
    padding: 50px 0;
    color: #fff;
    text-align: center;
}
.cta-band h3 { font-size: 28px; font-weight: bold; margin-bottom: 12px; }
.cta-band p { font-size: 15px; opacity: 0.9; margin-bottom: 24px; }
.cta-band .cta-btn {
    display: inline-block;
    padding: 14px 40px;
    background: #fff;
    color: #1e5fbf;
    font-size: 15px;
    font-weight: 600;
    border-radius: 4px;
    transition: all 0.3s;
}
.cta-band .cta-btn:hover { transform: translateY(-2px); box-shadow: 0 6px 20px rgba(0,0,0,0.2); }
/* ========== Footer ========== */
.footer { background: #0a1a2e; color: #b8c5d6; padding-top: 60px; }
.footer-main { display: grid; grid-template-columns: 2fr 1fr 1fr 1.5fr; gap: 40px; padding-bottom: 40px; border-bottom: 1px solid #1a2a3a; }
.footer-col h4 { color: #fff; font-size: 16px; margin-bottom: 20px; font-weight: 600; }
.footer-col p { font-size: 13px; line-height: 2; color: #8a99ab; }
.footer-col p .ico { color: #1e5fbf; margin-right: 8px; }
.footer-col ul li { margin-bottom: 10px; }
.footer-col ul li a { font-size: 13px; color: #8a99ab; transition: color 0.2s; }
.footer-col ul li a:hover { color: #1e5fbf; }
.footer-contact .qr {
    width: 120px; height: 120px;
    background: #fff;
    border-radius: 4px;
    display: flex; align-items: center; justify-content: center;
    color: #0a1a2e;
    font-size: 12px;
    text-align: center;
    margin-top: 10px;
}
.footer-bottom {
    padding: 20px 0;
    text-align: center;
    font-size: 12px;
    color: #5a6a7e;
}
.footer-bottom a { color: #5a6a7e; margin: 0 8px; }
.footer-bottom a:hover { color: #8a99ab; }
/* ========== 侧边悬浮 ========== */
.side-tools {
    position: fixed;
    right: 20px; bottom: 80px;
    z-index: 99;
    display: flex; flex-direction: column; gap: 10px;
}
.side-tool {
    width: 50px; height: 50px;
    background: #1e5fbf;
    color: #fff;
    border-radius: 6px;
    display: flex; flex-direction: column; align-items: center; justify-content: center;
    cursor: pointer;
    transition: all 0.3s;
    box-shadow: 0 4px 12px rgba(30,95,191,0.3);
    font-size: 12px;
    border: none;
}
.side-tool:hover { background: #0a3a82; transform: translateX(-4px); }
.side-tool.top { background: rgba(30,95,191,0.9); }
/* ========== 响应式 ========== */
@media (max-width: 1024px) {
    .nav > li > a { padding: 0 16px; font-size: 15px; }
    .product-grid { grid-template-columns: repeat(2, 1fr); }
    .app-grid { grid-template-columns: repeat(4, 1fr); }
    .why-grid { grid-template-columns: repeat(2, 1fr); }
    .footer-main { grid-template-columns: 1fr 1fr; }
    .about-wrap { flex-direction: column; }
    .about-media { flex: none; }
    .news-wrap { grid-template-columns: 1fr; }
}
@media (max-width: 768px) {
    .top-bar { display: none; }
    .header .container { height: 64px; }
    .nav { display: none; }
    .logo-text .cn { font-size: 18px; }
    .banner { height: 380px; }
    .banner-content .main-title { font-size: 28px; }
    .banner-content .desc { font-size: 14px; }
    .section { padding: 40px 0; }
    .section-header .cn-title { font-size: 24px; }
    .product-grid { grid-template-columns: 1fr; }
    .app-grid { grid-template-columns: repeat(2, 1fr); }
    .why-grid { grid-template-columns: 1fr; }
    .footer-main { grid-template-columns: 1fr; gap: 30px; }
    .about-features { grid-template-columns: 1fr; }
    .news-wrap { grid-template-columns: 1fr; }
    .news-featured { height: 200px; }
    .prod-grid { grid-template-columns: 1fr; }
    .art-article-grid { grid-template-columns: 1fr; }
    .art-layout { grid-template-columns: 1fr; }
    .art-filter-bar { flex-direction: column; align-items: stretch; }
    .art-search-input { width: 100%; flex: 1; }
    .art-side-nav { display: none; }
}

/* ========== 移动端汉堡菜单按钮 ========== */
.nav-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 40px;
    height: 40px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0;
    position: absolute;
    right: 16px;
    top: 50%;
    transform: translateY(-50%);
    z-index: 1200;
}

.nav-toggle span {
    display: block;
    width: 26px;
    height: 3px;
    background: #1e5fbf;
    border-radius: 2px;
    transition: all 0.3s ease;
    margin: 0 auto;
}

.nav-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(6px, 6px);
}
.nav-toggle.active span:nth-child(2) {
    opacity: 0;
}
.nav-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(6px, -6px);
}

/* ========== 移动端导航抽屉 ========== */
.mobile-nav-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1300;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.mobile-nav-overlay.active {
    display: block;
    opacity: 1;
}

.mobile-nav {
    position: fixed;
    top: 0;
    right: -280px;
    width: 280px;
    height: 100vh;
    background: #fff;
    z-index: 1400;
    overflow-y: auto;
    transition: right 0.35s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: -4px 0 20px rgba(0, 0, 0, 0.15);
}

.mobile-nav.active {
    right: 0;
}

.mobile-nav-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 18px 20px;
    background: #1e5fbf;
    color: #fff;
}

.mobile-nav-title {
    font-size: 17px;
    font-weight: 600;
}

.mobile-nav-close {
    background: none;
    border: none;
    color: #fff;
    font-size: 28px;
    line-height: 1;
    cursor: pointer;
    padding: 0;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.mobile-nav-list {
    list-style: none;
    margin: 0;
    padding: 0;
}

.mobile-nav-item {
    border-bottom: 1px solid #f0f3f7;
    position: relative;
}

.mobile-nav-item > a {
    display: block;
    padding: 15px 20px;
    font-size: 15px;
    color: #2c3e50;
    text-decoration: none;
    transition: all 0.2s;
}

.mobile-nav-item > a:hover,
.mobile-nav-item > a:active {
    background: #f0f6ff;
    color: #1e5fbf;
}

.mobile-sub-toggle {
    position: absolute;
    right: 8px;
    top: 50%;
    transform: translateY(-50%);
    width: 36px;
    height: 36px;
    border: none;
    background: none;
    font-size: 22px;
    color: #999;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform 0.3s;
}

.mobile-sub-toggle.active {
    transform: translateY(-50%) rotate(45deg);
    color: #1e5fbf;
}

.mobile-sub-nav {
    list-style: none;
    margin: 0;
    padding: 0;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.35s ease;
    background: #f8fafc;
}

.mobile-sub-nav.active {
    max-height: 500px;
}

.mobile-sub-nav li a {
    display: block;
    padding: 12px 20px 12px 36px;
    font-size: 14px;
    color: #5a6572;
    text-decoration: none;
    border-bottom: 1px solid #f0f3f7;
    transition: all 0.2s;
}

.mobile-sub-nav li a:hover {
    color: #1e5fbf;
    background: #eef5ff;
}

/* 桌面端隐藏汉堡按钮 */
@media (min-width: 769px) {
    .nav-toggle { display: none; }
}

/* 移动端显示汉堡按钮 */
@media (max-width: 768px) {
    .nav-toggle { display: flex; }
    .header .container { position: relative; }
}