/* ============ 基础与变量（对齐管理系统 VI：黑色侧边改商务深蓝，强调沿用系统红） ============ */
:root{
    --navy:#1C3348;        /* 商务深蓝（替代系统深灰侧边 #252D36） */
    --navy-2:#26495F;
    --primary:#E60013;     /* 系统主强调红 */
    --primary-dark:#CF131C;
    --blue:#1359A8;
    --sky:#EDF2F7;
    --ink:#2F3E50;         /* 系统文字色 */
    --muted:#5C6B7A;
    --bg:#F4F6F8;          /* 系统主区背景 */
    --line:#E5EAF0;
    --shadow:0 8px 26px rgba(28,51,72,.10);
    --radius:14px;
}
*{margin:0;padding:0;box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
    font-family:"HarmonyOS Sans SC","PingFang SC","Microsoft YaHei","Source Han Sans SC","Helvetica Neue",Arial,sans-serif;
    color:var(--ink);background:#fff;line-height:1.7;-webkit-font-smoothing:antialiased;
}
a{text-decoration:none;color:inherit;}
img{max-width:100%;display:block;-webkit-user-select:none;user-select:none;-webkit-touch-callout:none;-webkit-user-drag:none;}
.container{max-width:1200px;margin:0 auto;padding:0 24px;}

/* ============ 按钮 ============ */
.btn{
    display:inline-flex;align-items:center;gap:8px;justify-content:center;
    padding:12px 26px;border-radius:10px;font-size:15px;font-weight:600;
    border:1px solid transparent;cursor:pointer;transition:all .25s ease;white-space:nowrap;
}
.btn-primary{background:var(--primary);color:#fff;box-shadow:0 8px 20px rgba(230,0,19,.28);}
.btn-primary:hover{background:var(--primary-dark);transform:translateY(-2px);}
.btn-system{background:var(--primary-dark);color:#fff;border:1px solid rgba(255,255,255,.25);}
.btn-system:hover{background:#B30F18;}
.btn-block{width:100%;}

/* ============ 顶部导航 ============ */
.site-header{
    position:fixed;top:0;left:0;right:0;z-index:1000;
    background:var(--primary);border-bottom:1px solid rgba(255,255,255,.12);
}
.nav-wrap{display:flex;align-items:center;justify-content:space-between;height:72px;gap:24px;}
.brand{display:flex;align-items:center;gap:12px;}
.brand-logo{height:38px;width:auto;}
.site-nav{display:flex;gap:28px;}
.nav-link{color:rgba(255,255,255,.82);font-size:15px;font-weight:500;position:relative;padding:6px 0;}
.nav-link::after{content:"";position:absolute;left:0;bottom:0;width:0;height:2px;background:rgba(255,255,255,.85);transition:width .25s;}
.nav-link:hover,.nav-link.active{color:#fff;}
.nav-link:hover::after,.nav-link.active::after{width:100%;}
.nav-actions{display:flex;align-items:center;gap:14px;}
.nav-toggle{display:none;flex-direction:column;gap:5px;background:none;border:0;cursor:padding:6px;}
.nav-toggle span{width:24px;height:2px;background:#fff;border-radius:2px;}

/* ============ Hero（浅色简洁背景，对齐系统登录页中性光影） ============ */
.hero{position:relative;min-height:100vh;display:flex;align-items:center;color:var(--ink);overflow:hidden;}
.hero-bg{position:absolute;inset:0;z-index:0;}
.hero-grid{
    position:absolute;inset:0;
    background-image:linear-gradient(rgba(28,51,72,.045) 1px,transparent 1px),linear-gradient(90deg,rgba(28,51,72,.045) 1px,transparent 1px);
    background-size:56px 56px;
}
.hero-glow{
    position:absolute;right:-10%;top:-20%;width:60%;height:120%;
    background:radial-gradient(ellipse at center,rgba(28,51,72,.06),transparent 60%);
}
.hero::before{
    content:"";position:absolute;inset:0;z-index:0;
    background:linear-gradient(135deg,#F4F6F8 0%,#EDF1F5 100%);
}
.hero-inner{position:relative;z-index:1;padding-top:120px;padding-bottom:80px;}
.hero-eyebrow{font-size:14px;letter-spacing:3px;color:var(--navy);font-weight:600;margin-bottom:20px;}
.hero-title{font-size:52px;font-weight:800;line-height:1.25;letter-spacing:2px;color:var(--navy);margin-bottom:20px;}
.hero-sub{font-size:20px;color:var(--ink);letter-spacing:4px;margin-bottom:18px;font-weight:600;}
.hero-desc{max-width:640px;color:var(--muted);font-size:16px;margin-bottom:32px;}
.hero-cta{display:flex;gap:16px;flex-wrap:wrap;margin-bottom:56px;}
.hero-stats{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;max-width:880px;
    border-top:1px solid var(--line);padding-top:32px;}
.stat-num{display:block;font-size:34px;font-weight:800;color:var(--navy);}
.stat-unit{font-size:15px;font-weight:600;margin-left:2px;color:var(--navy);}
.stat-label{font-size:13px;color:var(--muted);}

/* ============ 通用 Section ============ */
.section{padding:96px 0;}
.section-alt{background:var(--bg);}
.section-head{text-align:center;max-width:640px;margin:0 auto 52px;}
.section-tag{display:inline-block;font-size:12px;letter-spacing:3px;color:var(--navy);font-weight:700;margin-bottom:12px;}
.section-title{font-size:34px;font-weight:800;color:var(--navy);letter-spacing:1px;margin-bottom:14px;}
.section-sub{color:var(--muted);font-size:16px;}

/* ============ 简介 ============ */
.about-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:48px;align-items:start;}
.about-text p{color:var(--muted);margin-bottom:18px;font-size:15.5px;}
.about-text p:first-child{color:var(--ink);}
.about-cards{display:grid;grid-template-columns:1fr 1fr;gap:20px;}
.info-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:24px;box-shadow:var(--shadow);}
.info-icon{width:46px;height:46px;border-radius:12px;background:var(--sky);color:var(--navy);
    display:flex;align-items:center;justify-content:center;font-size:20px;margin-bottom:14px;}
.info-card h4{font-size:16px;margin-bottom:8px;color:var(--navy);}
.info-card p{font-size:13.5px;color:var(--muted);}

/* ============ 资质 ============ */
.qual-tags{display:flex;flex-wrap:wrap;gap:12px;justify-content:center;margin-bottom:44px;}
.qual-tag{background:#fff;border:1px solid var(--line);border-left:3px solid var(--navy);
    padding:10px 18px;border-radius:10px;font-size:14px;font-weight:600;color:var(--navy);box-shadow:0 4px 12px rgba(28,51,72,.06);}
.cert-grid{columns:4;column-gap:20px;}
.cert-item{border-radius:var(--radius);overflow:hidden;border:1px solid var(--line);background:#fff;cursor:zoom-in;
    box-shadow:var(--shadow);transition:transform .25s;break-inside:avoid;margin-bottom:20px;}
.cert-item:hover{transform:translateY(-4px);}
.cert-item img{width:100%;height:auto;display:block;}
.cert-cap{padding:10px 14px;font-size:13px;color:var(--muted);text-align:center;}

/* ============ 业务领域 ============ */
.biz-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;}
.biz-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:30px 26px;transition:all .25s;}
.biz-card:hover{border-color:var(--navy);box-shadow:var(--shadow);transform:translateY(-4px);}
.biz-icon{width:54px;height:54px;border-radius:14px;background:var(--navy);
    color:#fff;display:flex;align-items:center;justify-content:center;font-size:24px;margin-bottom:18px;}
.biz-card h3{font-size:18px;color:var(--navy);margin-bottom:10px;}
.biz-card p{font-size:14px;color:var(--muted);}

/* ============ 业绩 ============ */
.case-list{display:grid;grid-template-columns:1fr 1fr;gap:24px;}
.case-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:28px;display:flex;gap:20px;transition:all .25s;}
.case-card:hover{box-shadow:var(--shadow);border-color:var(--navy);}
.case-index{font-size:28px;font-weight:800;color:var(--sky);line-height:1;min-width:44px;}
.case-body h3{font-size:17px;color:var(--navy);margin-bottom:10px;}
.case-tags{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:10px;}
.case-tags span{font-size:12px;color:var(--navy);background:var(--sky);padding:3px 10px;border-radius:20px;}
.case-body p{font-size:14px;color:var(--muted);}

/* ============ 项目实拍画廊 ============ */
.photo-grid{columns:4;column-gap:20px;}
.photo-item{border-radius:var(--radius);overflow:hidden;border:1px solid var(--line);background:#fff;cursor:zoom-in;
    box-shadow:var(--shadow);transition:transform .25s;break-inside:avoid;margin-bottom:20px;}
.photo-item:hover{transform:translateY(-4px);}
.photo-item img{width:100%;height:auto;display:block;}
.photo-cap{padding:10px 14px;font-size:13px;color:var(--muted);text-align:center;}

/* ============ 联系 ============ */
.contact-grid{display:grid;grid-template-columns:.9fr 1.1fr;gap:48px;align-items:start;}
.contact-info{display:flex;flex-direction:column;gap:26px;}
.contact-item{display:flex;gap:18px;align-items:flex-start;}
.contact-icon{width:48px;height:48px;border-radius:12px;background:var(--sky);color:var(--navy);
    display:flex;align-items:center;justify-content:center;font-size:19px;flex-shrink:0;}
.contact-item h4{font-size:15px;color:var(--navy);margin-bottom:4px;}
.contact-item a,.contact-item p{font-size:15px;color:var(--muted);}
.contact-item a:hover{color:var(--navy);}
.contact-panel{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:32px;box-shadow:var(--shadow);}
.contact-panel h4{font-size:18px;color:var(--navy);margin-bottom:12px;}
.panel-desc{font-size:15px;color:var(--muted);line-height:1.8;margin-bottom:22px;}
.panel-tags{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:24px;}
.panel-tags span{background:var(--sky);color:var(--navy);border-radius:8px;padding:8px 14px;font-size:14px;}
.panel-meta{list-style:none;display:flex;flex-direction:column;gap:14px;}
.panel-meta li{display:flex;gap:12px;align-items:flex-start;font-size:15px;color:var(--muted);}
.panel-meta i{color:var(--navy);margin-top:3px;}

/* ============ 页脚 ============ */
.site-footer{background:var(--navy);color:rgba(255,255,255,.8);padding:56px 0 0;}
.footer-main{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:40px;padding-bottom:40px;}
.footer-brand{display:flex;gap:14px;align-items:center;}
.footer-logo{height:44px;width:auto;}
.footer-col h5{color:#fff;font-size:15px;margin-bottom:16px;}
.footer-col a{display:block;font-size:14px;color:rgba(255,255,255,.7);margin-bottom:10px;}
.footer-col a:hover{color:#fff;}
.footer-bottom{display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;
    border-top:1px solid rgba(255,255,255,.1);padding:22px 24px;font-size:13px;color:rgba(255,255,255,.55);}

/* ============ 灯箱 ============ */
.lightbox{position:fixed;inset:0;z-index:2000;background:rgba(16,30,43,.92);display:none;
    align-items:center;justify-content:center;padding:40px;}
.lightbox.open{display:flex;}
.lightbox-media{position:relative;max-width:100%;max-height:88vh;}
.lightbox-media img{max-width:100%;max-height:88vh;border-radius:10px;box-shadow:0 20px 60px rgba(0,0,0,.5);display:block;}
.lightbox-watermark{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center;
    gap:26px;transform:rotate(-20deg);pointer-events:none;overflow:hidden;}
.lightbox-watermark span{white-space:nowrap;color:rgba(255,255,255,.22);font-size:21px;font-weight:600;letter-spacing:2px;}
.lightbox-close{position:absolute;top:24px;right:30px;background:none;border:0;color:#fff;font-size:40px;cursor:pointer;line-height:1;}

/* ============ 响应式 ============ */
@media (max-width:992px){
    .hero-title{font-size:38px;}
    .about-grid,.contact-grid{grid-template-columns:1fr;gap:32px;}
    .biz-grid{grid-template-columns:repeat(2,1fr);}
    .cert-grid,.photo-grid{columns:2;}
    .footer-main{grid-template-columns:1fr 1fr;}
}
@media (max-width:768px){
    .site-nav{position:fixed;top:72px;left:0;right:0;background:var(--primary);flex-direction:column;
        gap:0;padding:12px 24px;border-bottom:1px solid rgba(255,255,255,.1);display:none;}
    .site-nav.open{display:flex;}
    .nav-link{padding:14px 0;border-bottom:1px solid rgba(255,255,255,.08);}
    .nav-toggle{display:flex;}
    .btn-system{display:none;}
    .hero{min-height:auto;}
    .hero-title{font-size:30px;}
    .hero-stats{grid-template-columns:repeat(2,1fr);gap:20px;}
    .section{padding:64px 0;}
    .section-title{font-size:26px;}
    .case-list{grid-template-columns:1fr;}
    .cert-grid,.photo-grid{columns:1;}
    .footer-main{grid-template-columns:1fr;gap:28px;}
}