:root{
  --blue:#1e4e8c; --blue-dark:#163a6b; --blue-light:#eaf1fb;
  --gray:#f5f7fa; --text:#222; --muted:#5f6b7a; --line:#e3e8ef;
  --radius:14px; --shadow:0 8px 24px rgba(20,40,80,.08);
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:"Segoe UI",-apple-system,"Microsoft YaHei",Arial,sans-serif;color:var(--text);line-height:1.7;background:#fff}
img{display:block;max-width:100%}
a{text-decoration:none;color:inherit}
.container{width:min(1140px,92vw);margin:0 auto}

/* NAV */
.nav{position:fixed;top:0;left:0;right:0;z-index:50;background:rgba(255,255,255,.92);backdrop-filter:blur(8px);border-bottom:1px solid var(--line);transition:.25s}
.nav.scrolled{box-shadow:var(--shadow)}
.nav-inner{display:flex;align-items:center;justify-content:space-between;height:64px}
.brand{display:flex;align-items:center;gap:10px;font-weight:700}
.brand-logo{height:36px;width:auto}
.brand-name{font-size:15px;color:var(--blue-dark);white-space:nowrap}
.nav-menu{display:flex;align-items:center;gap:26px}
.nav-menu a{font-size:15px;color:var(--text);position:relative;padding:4px 0;transition:.2s}
.nav-menu a:hover{color:var(--blue)}
.nav-menu a::after{content:"";position:absolute;left:0;bottom:-2px;width:0;height:2px;background:var(--blue);transition:.2s}
.nav-menu a:hover::after{width:100%}
.lang-switch{margin-left:6px;border:1px solid var(--blue);color:var(--blue);background:transparent;border-radius:20px;padding:5px 14px;cursor:pointer;font-size:14px;transition:.2s}
.lang-switch:hover{background:var(--blue);color:#fff}
.nav-toggle{display:none;flex-direction:column;gap:5px;background:none;border:0;cursor:pointer;padding:6px}
.nav-toggle span{width:24px;height:2px;background:var(--blue-dark);transition:.3s}
.nav-toggle.active span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.nav-toggle.active span:nth-child(2){opacity:0}
.nav-toggle.active span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

/* HERO */
.hero{min-height:100vh;display:flex;align-items:center;background:linear-gradient(rgba(16,34,66,.78),rgba(16,34,66,.78)),url(../img/office1.jpg) center/cover;color:#fff;padding:120px 0 80px}
.hero-inner{max-width:760px}
.hero-eyebrow{letter-spacing:3px;text-transform:uppercase;font-size:13px;color:#bcd4f5;margin-bottom:14px}
.hero-title{font-size:clamp(30px,5vw,52px);font-weight:800;line-height:1.2;margin-bottom:16px}
.hero-slogan{font-size:clamp(18px,2.4vw,26px);color:#ffd479;font-weight:600;margin-bottom:18px}
.hero-desc{font-size:17px;color:#e8eefb;max-width:620px;margin-bottom:30px}
.hero-actions{display:flex;gap:14px;flex-wrap:wrap}
.btn{display:inline-block;padding:12px 28px;border-radius:30px;font-size:15px;font-weight:600;transition:.2s}
.btn-primary{background:#ffd479;color:#1a2f55}
.btn-primary:hover{background:#ffc857;transform:translateY(-2px)}
.btn-ghost{border:1px solid #fff;color:#fff}
.btn-ghost:hover{background:#fff;color:var(--blue-dark)}

/* SECTIONS */
.section{padding:84px 0}
.section-alt{background:var(--gray)}
.section-title{text-align:center;font-size:clamp(24px,3vw,34px);color:var(--blue-dark);margin-bottom:14px;position:relative;padding-bottom:14px}
.section-title::after{content:"";position:absolute;left:50%;transform:translateX(-50%);bottom:0;width:54px;height:3px;background:var(--blue);border-radius:3px}
.section-lead{text-align:center;color:var(--muted);max-width:680px;margin:0 auto 40px}

/* ABOUT */
.about-intro{max-width:820px;margin:0 auto 44px;color:var(--muted);font-size:16px}
.about-intro p{margin-bottom:14px}
.about-grid{display:grid;grid-template-columns:1fr 1fr;gap:40px;margin-bottom:44px}
.col-title{font-size:19px;color:var(--blue-dark);margin-bottom:16px;padding-left:12px;border-left:4px solid var(--blue)}
.adv-list,.partner-list{list-style:none}
.adv-list li{position:relative;padding-left:28px;margin-bottom:12px;color:var(--text)}
.adv-list li::before{content:"";position:absolute;left:0;top:9px;width:16px;height:16px;border-radius:50%;background:var(--blue-light);box-shadow:inset 0 0 0 4px var(--blue)}
.partner-list{display:flex;flex-wrap:wrap;gap:10px}
.partner-list li{background:#fff;border:1px solid var(--line);border-radius:20px;padding:8px 16px;font-size:14px;color:var(--blue-dark)}
.gallery{display:grid;grid-template-columns:1fr 1fr;gap:18px}
.gallery img{border-radius:var(--radius);box-shadow:var(--shadow);object-fit:cover;height:280px;width:100%}

/* CARDS */
.cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:22px}
.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:28px;box-shadow:var(--shadow);transition:.25s}
.card:hover{transform:translateY(-4px);border-color:var(--blue)}
.card h3{color:var(--blue-dark);font-size:19px;margin-bottom:10px}
.card p{color:var(--muted);font-size:15px}

/* TEAM */
.team-stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(160px,1fr));gap:18px;margin-bottom:46px}
.stat-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:24px 12px;text-align:center;box-shadow:var(--shadow)}
.stat-num{font-size:30px;font-weight:800;color:var(--blue);line-height:1.2}
.stat-label{font-size:13px;color:var(--muted);margin-top:6px}
.team-video-wrap{background:#0f2140;border-radius:var(--radius);box-shadow:var(--shadow);overflow:hidden;margin-bottom:50px}
.team-video{width:100%;display:block;aspect-ratio:16/9;background:#0f2140}
.team-sub{text-align:center;font-size:20px;color:var(--blue-dark);margin:-26px 0 18px;position:relative}
.team-clips{display:grid;grid-template-columns:1fr 1fr;gap:20px;margin-bottom:50px;align-items:start}
.clip-card{background:#0f2140;border-radius:var(--radius);box-shadow:var(--shadow);overflow:hidden}
.clip-card video{width:100%;display:block;aspect-ratio:16/9;background:#0f2140}
.clip-card video.portrait{width:auto;height:min(540px,64vh);aspect-ratio:9/16;margin:0 auto}
.album-tabs{display:flex;justify-content:center;gap:12px;flex-wrap:wrap;margin-bottom:14px}
.album-tab{border:1px solid var(--line);background:#fff;border-radius:24px;padding:9px 22px;font-size:14px;color:var(--muted);cursor:pointer;transition:.2s;font-family:inherit}
.album-tab:hover{border-color:var(--blue);color:var(--blue)}
.album-tab.active{background:var(--blue);border-color:var(--blue);color:#fff}
.album-desc{text-align:center;color:var(--muted);font-size:14px;margin:0 0 24px}
.album-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:16px}
.album-grid img{width:100%;height:190px;object-fit:cover;border-radius:10px;box-shadow:var(--shadow);cursor:zoom-in;transition:.25s;background:var(--blue-light)}
.album-grid img:hover{transform:translateY(-4px) scale(1.01)}

/* LIGHTBOX */
.lightbox{position:fixed;inset:0;background:rgba(8,16,32,.92);z-index:100;display:none;align-items:center;justify-content:center;padding:4vh 4vw}
.lightbox.open{display:flex}
.lightbox img{max-width:92vw;max-height:88vh;border-radius:8px;box-shadow:0 20px 60px rgba(0,0,0,.5)}
.lb-close,.lb-prev,.lb-next{position:absolute;border:0;background:rgba(255,255,255,.14);color:#fff;font-size:26px;width:48px;height:48px;border-radius:50%;cursor:pointer;transition:.2s;display:flex;align-items:center;justify-content:center;line-height:1}
.lb-close:hover,.lb-prev:hover,.lb-next:hover{background:var(--blue)}
.lb-close{top:22px;right:26px}
.lb-prev{left:22px;top:50%;transform:translateY(-50%)}
.lb-next{right:22px;top:50%;transform:translateY(-50%)}

/* NEWS */
.news-list{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:22px}
.news-item{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:24px;box-shadow:var(--shadow)}
.news-date{display:inline-block;font-size:13px;color:var(--blue);background:var(--blue-light);padding:3px 12px;border-radius:20px;margin-bottom:12px}
.news-item h3{font-size:17px;color:var(--blue-dark);margin-bottom:8px}
.news-item p{color:var(--muted);font-size:14px}

/* CONTACT */
.contact-grid{display:grid;grid-template-columns:1.2fr .8fr;gap:40px;align-items:start}
.contact-info{list-style:none}
.contact-info li{display:flex;gap:14px;padding:16px 0;border-bottom:1px solid var(--line)}
.c-label{flex:0 0 70px;color:var(--blue);font-weight:600}
.c-value{color:var(--text)}
.contact-extra{background:var(--gray);border-radius:var(--radius);padding:20px;text-align:center}
.license{border-radius:10px;box-shadow:var(--shadow);margin-bottom:14px}
.official{color:var(--blue-dark);font-weight:600;font-size:15px}

/* FOOTER */
.footer{background:var(--blue-dark);color:#cdd9ec;padding:26px 0;text-align:center;font-size:14px}
.footer-beian{margin-top:6px;color:#8fa3c4;font-size:13px}

/* RESPONSIVE */
@media(max-width:768px){
  .nav-toggle{display:flex}
  .nav-menu{position:absolute;top:64px;left:0;right:0;flex-direction:column;gap:0;background:#fff;padding:0 6vw;max-height:0;overflow:hidden;box-shadow:var(--shadow);transition:.3s}
  .nav-menu.open{max-height:420px;padding:10px 6vw 20px}
  .nav-menu a{padding:12px 0;width:100%;border-bottom:1px solid var(--line)}
  .nav-menu a::after{display:none}
  .lang-switch{margin:12px 0 4px;align-self:flex-start}
  .about-grid,.contact-grid,.gallery{grid-template-columns:1fr}
  .about-grid{gap:28px}
  .team-stats{grid-template-columns:repeat(2,1fr);gap:12px}
  .album-grid{grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:10px}
  .album-grid img{height:130px}
  .team-clips{grid-template-columns:1fr;gap:14px}
  .lb-prev{left:8px}.lb-next{right:8px}
}