/* ===== GBS&T 官网共享样式 ===== */
:root{
  --primary:#1e4a7a;--primary-dark:#1a3a5c;--primary-light:#3a6fa0;
  --accent:#4a90d9;--silver:#c0c8d0;--silver-light:#e8ecf0;
  --white:#fff;--text-dark:#1a1a2e;--text-gray:#555;
  --bg-light:#f0f4f8;--shadow:0 4px 20px rgba(26,58,92,.12);
  --shadow-hover:0 8px 40px rgba(26,58,92,.22);--radius:8px;
  --transition:all .3s ease;
}
*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:'Microsoft YaHei','PingFang SC',Arial,sans-serif;font-size:21px;color:var(--text-dark);overflow-x:hidden;line-height:1.6}
a{text-decoration:none;color:inherit}
img{max-width:100%;height:auto;display:block}
ul{list-style:none}
button{cursor:pointer;border:none;outline:none;font-family:inherit}
input,textarea,select{outline:none;font-family:inherit}
::-webkit-scrollbar{width:6px}
::-webkit-scrollbar-track{background:var(--bg-light)}
::-webkit-scrollbar-thumb{background:var(--primary-light);border-radius:3px}

/* ===== NAV ===== */
.nav{position:fixed;top:0;width:100%;z-index:1000;background:rgba(255,255,255,.97);backdrop-filter:blur(10px);height:70px;display:flex;align-items:center;padding:0 5%;transition:var(--transition);box-shadow:0 2px 12px rgba(26,58,92,.1)}
.nav.scrolled{background:rgba(255,255,255,.99);box-shadow:0 2px 20px rgba(26,58,92,.18)}
.nav-brand{display:flex;align-items:center;gap:12px;flex-shrink:0}
.nav-logo-box{width:160px;height:70px;background:transparent;border-radius:0;display:flex;align-items:center;justify-content:center;overflow:hidden;flex-shrink:0}
.nav-logo-box img{width:100%;height:100%;object-fit:contain;transform:scale(3.2);transform-origin:center center}
.nav-name .en{font-size:27px;font-weight:700;letter-spacing:2px;color:var(--primary)}
.nav-name .cn{font-size:18px;color:var(--text-gray);letter-spacing:1px;display:block}
.nav-menu{display:flex;align-items:center;gap:2px;margin-left:auto}
.nav-link{color:rgba(30,74,122,.85);padding:8px 16px;border-radius:4px;font-size:22px;transition:var(--transition);white-space:nowrap;position:relative}
.nav-link:hover,.nav-link.active{color:var(--primary);background:rgba(74,144,217,.1)}
.nav-link.active::after{content:'';position:absolute;bottom:2px;left:50%;transform:translateX(-50%);width:18px;height:2px;background:var(--accent);border-radius:1px}
.nav-cta{background:var(--accent)!important;color:#fff!important;padding:10px 22px!important;border-radius:20px!important;margin-left:8px;font-size:22px!important}
.nav-cta:hover{background:#3a80c9!important}
.lang-toggle{background:rgba(30,74,122,.08);color:var(--primary);border:1px solid rgba(30,74,122,.2);padding:6px 16px;border-radius:4px;font-size:20px;font-weight:700;letter-spacing:1px;transition:var(--transition);margin-left:12px;flex-shrink:0}
.lang-toggle:hover{background:rgba(30,74,122,.15);border-color:rgba(30,74,122,.4)}
.nav-toggle{display:none;flex-direction:column;gap:5px;padding:8px;cursor:pointer;margin-left:8px}
.nav-toggle span{width:24px;height:2px;background:var(--primary);border-radius:1px;transition:var(--transition)}

/* ===== PAGE HERO (sub-pages) ===== */
.page-hero{height:320px;background:linear-gradient(135deg,var(--primary-dark),var(--primary-light));display:flex;align-items:center;padding:0 5%;margin-top:70px;position:relative;overflow:hidden}
.page-hero::before{content:'';position:absolute;inset:0;opacity:.04;background-image:repeating-linear-gradient(0deg,transparent,transparent 50px,#fff 50px,#fff 51px),repeating-linear-gradient(90deg,transparent,transparent 50px,#fff 50px,#fff 51px)}
.page-hero-content{position:relative;z-index:1;max-width:1200px;width:100%;margin:0 auto}
.page-hero-tag{display:inline-block;background:rgba(74,144,217,.2);border:1px solid rgba(74,144,217,.4);color:var(--accent);padding:5px 14px;border-radius:20px;font-size:18px;letter-spacing:3px;margin-bottom:16px;text-transform:uppercase}
.page-hero h1{font-size:clamp(37px,4vw,61px);font-weight:900;color:#fff;line-height:1.1;margin-bottom:12px}
.page-hero h1 .hl{color:var(--accent)}
.page-hero p{font-size:22px;color:rgba(255,255,255,.6);max-width:560px}

/* ===== SECTION COMMON ===== */
.section{padding:80px 5%}
.section-alt{background:var(--bg-light)}
.container{max-width:1200px;margin:0 auto}
.section-header{text-align:center;margin-bottom:56px}
.section-tag{display:inline-block;color:var(--accent);font-size:18px;letter-spacing:3px;text-transform:uppercase;margin-bottom:10px;font-weight:700}
.section-title{font-size:clamp(35px,3vw,51px);font-weight:800;color:var(--primary);margin-bottom:14px;line-height:1.2}
.section-desc{font-size:22px;color:var(--text-gray);max-width:580px;margin:0 auto;line-height:1.9}
.divider{width:50px;height:3px;background:linear-gradient(to right,var(--accent),var(--primary-light));margin:18px auto 0;border-radius:2px}

/* ===== BUTTONS ===== */
.btn{display:inline-flex;align-items:center;gap:8px;padding:16px 36px;border-radius:4px;font-size:22px;font-weight:600;transition:var(--transition)}
.btn-primary{background:var(--accent);color:#fff}
.btn-primary:hover{background:#3a80c9;transform:translateY(-2px);box-shadow:0 8px 24px rgba(74,144,217,.4)}
.btn-outline{border:2px solid var(--primary);color:var(--primary)}
.btn-outline:hover{background:var(--primary);color:#fff}
.btn-sm{padding:8px 18px;font-size:13px}

/* ===== TABLES ===== */
.data-table{width:100%;border-collapse:collapse;font-size:20px}
.data-table th{background:var(--primary);color:#fff;padding:14px 18px;text-align:left;font-weight:600;font-size:19px;letter-spacing:.5px}
.data-table th:first-child{border-radius:6px 0 0 0}
.data-table th:last-child{border-radius:0 6px 0 0}
.data-table td{padding:13px 18px;border-bottom:1px solid var(--silver-light);vertical-align:middle}
.data-table tr:last-child td{border-bottom:none}
.data-table tr:nth-child(even){background:var(--bg-light)}
.data-table tr:hover{background:rgba(74,144,217,.05)}
.data-table .highlight{color:var(--accent);font-weight:700}
.table-wrap{overflow-x:auto;border-radius:var(--radius);box-shadow:var(--shadow)}

/* ===== CARDS ===== */
.card{background:#fff;border-radius:var(--radius);box-shadow:var(--shadow);transition:var(--transition)}
.card:hover{transform:translateY(-4px);box-shadow:var(--shadow-hover)}
.feat-tag{background:rgba(74,144,217,.1);color:var(--accent);padding:5px 12px;border-radius:20px;font-size:12px;font-weight:600;display:inline-block}
.badge{background:var(--accent);color:#fff;font-size:10px;padding:3px 10px;border-radius:10px;letter-spacing:1px;font-weight:700}

/* ===== FOOTER ===== */
footer{background:var(--primary-dark);color:rgba(255,255,255,.7);padding:56px 5% 28px}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:48px;max-width:1200px;margin:0 auto 40px}
.footer-brand .en{font-size:31px;font-weight:900;color:#fff;letter-spacing:2px;margin-bottom:4px}
.footer-brand .cn{font-size:19px;color:rgba(255,255,255,.5);margin-bottom:16px}
.footer-brand p{font-size:20px;line-height:1.8;color:rgba(255,255,255,.5);max-width:280px}
.footer-col h4{font-size:20px;font-weight:700;color:#fff;letter-spacing:1px;text-transform:uppercase;margin-bottom:16px}
.footer-col ul li{margin-bottom:8px}
.footer-col ul li a{font-size:20px;color:rgba(255,255,255,.5);transition:var(--transition)}
.footer-col ul li a:hover{color:#fff}
.footer-bottom{border-top:1px solid rgba(255,255,255,.08);padding-top:24px;display:flex;justify-content:space-between;align-items:center;max-width:1200px;margin:0 auto;flex-wrap:wrap;gap:12px}
.footer-bottom p{font-size:19px;color:rgba(255,255,255,.35)}

/* ===== REVEAL ANIMATION ===== */
.reveal{opacity:0;transform:translateY(30px);transition:opacity .6s ease,transform .6s ease}
.reveal.visible{opacity:1;transform:translateY(0)}
.reveal-delay-1{transition-delay:.1s}
.reveal-delay-2{transition-delay:.2s}
.reveal-delay-3{transition-delay:.3s}
.reveal-delay-4{transition-delay:.4s}

/* ===== RESPONSIVE ===== */
@media(max-width:1024px){
  .footer-grid{grid-template-columns:1fr 1fr}
}
@media(max-width:768px){
  .nav-menu{display:none;position:absolute;top:70px;left:0;width:100%;background:rgba(255,255,255,.99);flex-direction:column;padding:16px;gap:4px;box-shadow:0 8px 20px rgba(26,58,92,.15)}
  .nav-menu.open{display:flex}
  .nav-toggle{display:flex}
  .footer-grid{grid-template-columns:1fr}
  .page-hero{height:240px}
}