/* ===== RESET & BASE ===== */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;font-size:16px}
body{font-family:system-ui,-apple-system,"Segoe UI","Microsoft YaHei",sans-serif;color:#334155;background:var(--body-bg);line-height:1.7;overflow-x:hidden}
a{color:inherit;text-decoration:none}
img{max-width:100%;height:auto;display:block}
ul{list-style:none}

/* ===== VARIABLES ===== */
:root{
  --red:#3C9EFF;
  --red-dark:#2C7CD0;
  --red-light:#E4F2FE;
  --dark:#1E2F3F;
  --cream:#F9FDFF;
  --body-bg:#F2F9FF;
  --footer-bg:#1E2F3F;
  --earth:#C49A6C;
  --sun:#D35400;
  --sun-light:#FFF5EC;
  --white:#FFFFFF;
  --gray:#6B7280;
  --gray-light:#E2E8F0;
  --shadow-sm:0 2px 8px rgba(30,47,63,0.08);
  --shadow-md:0 4px 16px rgba(30,47,63,0.12);
  --shadow-lg:0 8px 32px rgba(30,47,63,0.16);
  --radius:12px;
  --radius-sm:8px;
  --max-w:1200px;
}

@media (prefers-color-scheme: dark) {
  :root{
    --red:#5AADFF;
    --red-dark:#3471B3;
    --red-light:#1E364A;
    --dark:#0B1420;
    --cream:#18232F;
    --body-bg:#0C1622;
    --footer-bg:#0B1420;
    --earth:#8B7A65;
    --sun:#E67E22;
    --sun-light:#1E1812;
    --white:#E8ECF0;
    --gray:#9CA3AF;
    --gray-light:#1E2A36;
    --shadow-sm:0 2px 8px rgba(0,0,0,0.3);
    --shadow-md:0 4px 16px rgba(0,0,0,0.4);
    --shadow-lg:0 8px 32px rgba(0,0,0,0.5);
  }
}

/* ===== HEADER & NAV ===== */
header{position:fixed;top:0;width:100%;z-index:1000;transition:all .3s;background:linear-gradient(180deg,rgba(2, 68, 129, 0.75) 0%,transparent 100%)}
header.scrolled{background:rgba(255,255,255,.95);backdrop-filter:blur(8px);box-shadow:var(--shadow-sm)}
header .inner{max-width:var(--max-w);margin:0 auto;padding:12px 20px;display:flex;align-items:center;justify-content:space-between}
header.scrolled .inner{padding:10px 20px}
.logo{display:flex;align-items:center;text-decoration:none;flex-shrink:0}
.logo img{height:40px;display:block}
.logo-text{font-size:1.15rem;font-weight:700;color:var(--white);margin-left:10px;letter-spacing:2px;white-space:nowrap}
header.scrolled .logo-text{color:var(--dark)}
@media(max-width:480px){.logo img{height:32px}.logo-text{font-size:1rem}}
nav{display:flex;gap:4px;flex-wrap:wrap}
nav a{color:var(--white);padding:6px 14px;border-radius:20px;font-size:.92rem;transition:all .25s;white-space:nowrap}
nav a:hover,nav a.active{background:rgba(255,255,255,.2)}
header.scrolled nav a{color:var(--dark)}
header.scrolled nav a:hover,header.scrolled nav a.active{background:var(--red-light);color:var(--red-dark)}
.menu-toggle{display:none;background:none;border:none;color:var(--white);font-size:1.6rem;cursor:pointer;padding:4px 8px}

/* ===== HERO CAROUSEL ===== */
.hero{position:relative;height:100vh;min-height:560px;overflow:hidden}
.hero .slides{position:relative;width:100%;height:100%}
.hero .slide{position:absolute;inset:0;background-size:cover;background-position:center;opacity:0;transition:opacity .8s ease}
.hero .slide.active{opacity:1}
.hero .slide::after{content:'';position:absolute;inset:0;background:linear-gradient(180deg,rgba(30,47,63,.55) 0%,rgba(60,158,255,.15) 50%,rgba(30,47,63,.5) 100%)}
.hero .hero-text{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center;color:#fff;text-align:center;z-index:2;padding:20px}
.hero .hero-text h1{font-size:clamp(2rem,5vw,3.2rem);font-weight:800;margin-bottom:16px;text-shadow:0 2px 12px rgba(0,0,0,.4);line-height:1.3}
.hero .hero-text p{font-size:clamp(1rem,2vw,1.25rem);opacity:.9;max-width:600px;margin-bottom:28px;text-shadow:0 1px 6px rgba(0,0,0,.3)}
.hero .hero-text .btns{display:flex;gap:14px;flex-wrap:wrap;justify-content:center}
.hero .hero-text .btn{padding:12px 32px;border-radius:30px;font-size:1rem;font-weight:600;cursor:pointer;transition:all .3s;border:none}
.hero .hero-text .btn-primary{background:var(--sun);color:#3D2E1F}
.hero .hero-text .btn-primary:hover{background:#E0A228;transform:translateY(-2px);box-shadow:0 6px 20px rgba(242,179,61,.4)}
.hero .hero-text .btn-outline{background:transparent;color:#fff;border:2px solid #fff}
.hero .hero-text .btn-outline:hover{background:rgba(255,255,255,.15);transform:translateY(-2px)}
.hero .dots{position:absolute;bottom:24px;left:50%;transform:translateX(-50%);display:flex;gap:10px;z-index:3}
.hero .dots span{width:10px;height:10px;border-radius:50%;background:rgba(255,255,255,.4);cursor:pointer;transition:all .3s}
.hero .dots span.active{background:var(--sun);width:28px;border-radius:5px}

/* ===== STATS BAR ===== */
.stats-bar{background:var(--red);color:#fff;padding:24px 0}
.stats-bar .inner{max-width:var(--max-w);margin:0 auto;display:flex;justify-content:space-around;flex-wrap:wrap;gap:20px;padding:0 20px}
.stat-item{text-align:center}
.stat-item .num{font-size:2rem;font-weight:800;display:block;line-height:1}
.stat-item .label{font-size:.88rem;opacity:.85;margin-top:4px}

/* ===== SECTION COMMON ===== */
section{padding:80px 20px}
section .inner{max-width:var(--max-w);margin:0 auto}
section.bg-light{background:var(--red-light)}
section.bg-cream{background:var(--cream)}
.section-title{text-align:center;margin-bottom:56px}
.section-title .tag{display:inline-block;background:var(--sun-light);color:#C2410C;padding:4px 16px;border-radius:20px;font-size:.85rem;font-weight:600;margin-bottom:12px}
.section-title h2{font-size:clamp(1.6rem,3vw,2.2rem);font-weight:800;color:var(--dark)}
.section-title h2 span{color:var(--red)}
.section-title .sub{color:var(--gray);font-size:.95rem;margin-top:8px}

/* ===== ABOUT ===== */
.about-grid{display:grid;grid-template-columns:1fr 1fr;gap:50px;align-items:center}
.about-img{position:relative;border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow-lg)}
.about-img img{width:100%;height:400px;object-fit:cover}
.about-text h3{font-size:1.5rem;margin-bottom:16px;color:var(--dark)}
.about-text p{color:#555;margin-bottom:12px}
.timeline{margin-top:24px}
.timeline h4{font-size:1.1rem;color:var(--red-dark);margin-bottom:12px}
.timeline-list{display:flex;flex-direction:column;gap:10px}
.tl-item{display:flex;gap:14px;align-items:baseline}
.tl-item .year{font-weight:800;color:var(--red);font-size:.95rem;flex-shrink:0;min-width:50px}
.tl-item .desc{color:#666;font-size:.92rem}

/* ===== PRODUCTS ===== */
.products-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.product-card{background:var(--white);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow-sm);cursor:pointer;transition:all .3s;text-align:center}
.product-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-lg)}
.product-card .img-box{height:200px;overflow:hidden;position:relative}
.product-card .img-box img{width:100%;height:100%;object-fit:cover;transition:transform .5s}
.product-card:hover .img-box img{transform:scale(1.08)}
.product-card .img-box.placeholder{background:linear-gradient(135deg,#E8F2FC,#C4DBF0);display:flex;align-items:center;justify-content:center;font-size:3.5rem}
.product-card .info{padding:16px}
.product-card .info .tag{display:inline-block;background:var(--red-light);color:var(--red-dark);padding:3px 12px;border-radius:12px;font-size:.78rem;margin-bottom:8px}
.product-card .info h4{font-size:1.05rem;color:var(--dark);margin-bottom:6px}
.product-card .info .spec{font-size:.82rem;color:var(--gray)}

/* ===== PRODUCT MODAL ===== */
.modal-overlay{display:none;position:fixed;inset:0;background:rgba(0,0,0,.65);z-index:2000;align-items:center;justify-content:center;padding:20px}
.modal-overlay.show{display:flex}
.modal{background:var(--white);border-radius:var(--radius);max-width:960px;width:100%;max-height:90vh;overflow-y:auto;position:relative;animation:modalIn .3s ease}
@keyframes modalIn{from{opacity:0;transform:translateY(30px)}to{opacity:1;transform:translateY(0)}}
.modal-close{position:sticky;top:8px;right:8px;background:rgba(0,0,0,.08);border:none;width:36px;height:36px;border-radius:50%;font-size:1.2rem;cursor:pointer;z-index:20;display:flex;align-items:center;justify-content:center;margin:8px 8px 0 auto}
.modal-close:hover{background:rgba(0,0,0,.16)}
.modal-content{display:none}
.modal-content.show{display:grid;grid-template-columns:1fr;gap:0}
.modal .modal-main{width:100%;max-height:300px;object-fit:contain;background:#f0f0f0;cursor:default}
.modal .modal-body{padding:20px 24px 24px}
.modal .modal-tag{display:inline-block;background:var(--sun-light);color:#B87A10;padding:4px 14px;border-radius:14px;font-size:.82rem;margin-bottom:12px}
.modal h3{font-size:1.5rem;color:var(--dark);margin-bottom:8px}
.modal .modal-gallery{display:flex;gap:8px;margin:0 0 16px;overflow-x:auto;padding-bottom:4px;-webkit-overflow-scrolling:touch}
.modal .modal-gallery img{width:100px;height:75px;object-fit:cover;border-radius:6px;cursor:pointer;flex-shrink:0;border:2px solid transparent;transition:all .2s}
.modal .modal-gallery img:hover,.modal .modal-gallery img.active{border-color:var(--red)}
.modal .spec-table{width:100%;border-collapse:collapse;margin:16px 0 0}
.modal .spec-table td{padding:10px 14px;border-bottom:1px solid var(--gray-light);font-size:.92rem}
.modal .spec-table td:first-child{font-weight:600;color:var(--dark);width:110px;white-space:nowrap}
.modal .spec-table td:last-child{color:#555}
/* Desktop two-column */
@media(min-width:768px){
  .modal-overlay{padding:24px}
  .modal-close{grid-column:1/-1;grid-row:1;margin:6px 10px 0 auto}
  .modal-content.show{grid-template-columns:420px 1fr;grid-template-rows:auto 1fr;gap:0}
  .modal .modal-main{grid-column:1;grid-row:2;max-height:420px;position:sticky;top:56px;align-self:start}
  .modal .modal-body{grid-column:2;grid-row:2;max-height:82vh;overflow-y:auto;padding:24px 28px 28px}
  .modal .modal-gallery{position:sticky;top:calc(420px + 60px);background:var(--white);z-index:5;margin:8px 0 0;padding:8px 0}
  .modal .modal-gallery img{width:90px;height:68px}
  .modal h3{font-size:1.35rem}
}
/* Mobile */
@media(max-width:767px){
  .modal-overlay{padding:10px}
  .modal{border-radius:12px 12px 0 0;align-self:end;max-height:92vh}
  .modal .modal-main{max-height:240px}
  .modal .modal-body{padding:16px 18px 20px}
  .modal .modal-gallery img{width:88px;height:66px}
}

/* ===== ADVANTAGES ===== */
.adv-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.adv-card{background:var(--white);padding:32px 24px;border-radius:var(--radius);box-shadow:var(--shadow-sm);text-align:center;transition:all .3s;border-top:4px solid transparent}
.adv-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-md);border-top-color:var(--red)}
.adv-card .icon{font-size:2.8rem;margin-bottom:14px}
.adv-card h4{font-size:1.1rem;color:var(--dark);margin-bottom:8px}
.adv-card p{font-size:.9rem;color:var(--gray);line-height:1.6}

/* ===== CERTIFICATES ===== */
.cert-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:30px;max-width:800px;margin:0 auto}
.cert-card{background:var(--white);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow-sm);cursor:pointer;transition:all .3s}
.cert-card:hover{transform:scale(1.03);box-shadow:var(--shadow-lg)}
.cert-card img{width:100%;height:320px;object-fit:contain;background:#fafafa;padding:20px}
.cert-card .caption{text-align:center;padding:12px;font-weight:600;color:var(--dark);font-size:.95rem}

/* ===== PROJECTS ===== */
.proj-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.proj-card{position:relative;border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow-sm);height:250px}
.proj-card img{width:100%;height:100%;object-fit:cover;transition:transform .5s}
.proj-card:hover img{transform:scale(1.06)}
.proj-card .overlay{position:absolute;bottom:0;left:0;right:0;background:linear-gradient(transparent,rgba(0,0,0,.7));color:#fff;padding:20px;font-weight:600;font-size:1rem}

/* ===== MAP & CONTACT ===== */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:start}
.map-box{position:relative;border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow-md);height:360px;background:var(--red-light);display:flex;align-items:center;justify-content:center;cursor:pointer}
.map-placeholder{text-align:center;color:var(--red-dark)}
.map-placeholder .pin{font-size:3rem;margin-bottom:8px}
.map-placeholder p{font-size:.9rem}
.contact-info h3{font-size:1.3rem;color:var(--dark);margin-bottom:20px}
.contact-list{display:flex;flex-direction:column;gap:14px}
.contact-item{display:flex;align-items:center;gap:12px;font-size:.95rem;color:#555}
.contact-item .ico{font-size:1.3rem;width:28px;text-align:center}

/* ===== MESSAGE FORM ===== */
.form-box{max-width:600px;margin:0 auto;background:var(--white);padding:36px;border-radius:var(--radius);box-shadow:var(--shadow-md)}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-bottom:16px}
.form-group{display:flex;flex-direction:column;gap:6px}
.form-group label{font-size:.88rem;font-weight:600;color:var(--dark)}
.form-group input,.form-group textarea{padding:10px 14px;border:1.5px solid var(--gray-light);border-radius:var(--radius-sm);font-size:.95rem;font-family:inherit;transition:border .2s;outline:none}
.form-group input:focus,.form-group textarea:focus{border-color:var(--red)}
.form-group textarea{resize:vertical;min-height:100px}
.form-submit{width:100%;padding:14px;background:var(--red);color:#fff;border:none;border-radius:30px;font-size:1.05rem;font-weight:600;cursor:pointer;transition:all .3s;margin-top:8px}
.form-submit:hover{background:var(--red-dark);transform:translateY(-2px);box-shadow:0 6px 20px rgba(60,158,255,.3)}

/* ===== FOOTER ===== */
footer{background:var(--footer-bg);color:rgba(255,255,255,.7);padding:40px 20px 24px;text-align:center}
footer .inner{max-width:var(--max-w);margin:0 auto}
footer .company{color:#fff;font-size:1.1rem;font-weight:700;margin-bottom:8px}
footer .links{margin:16px 0;display:flex;justify-content:center;gap:20px;font-size:.88rem}
footer .links a{color:rgba(255,255,255,.6);transition:color .2s}
footer .links a:hover{color:var(--sun)}
footer .copyright{font-size:.8rem;margin-top:12px}
footer .icp a{color:rgba(255,255,255,.4);font-size:.78rem}

/* ===== FLOATING BUTTONS ===== */
.float-btns{position:fixed;bottom:60px;right:20px;display:flex;flex-direction:column;gap:12px;z-index:999}
.float-btn{width:50px;height:50px;border-radius:50%;border:none;cursor:pointer;box-shadow:var(--shadow-md);display:flex;align-items:center;justify-content:center;font-size:1.3rem;transition:all .3s;color:#fff}
.float-btn.tel{background:var(--red);animation:pulse 2s infinite}
.float-btn.wx{background:#07C160}
.float-btn.top{background:var(--earth)}
.float-btn:hover{transform:scale(1.1)}
@keyframes pulse{0%,100%{box-shadow:0 0 0 0 rgba(60,158,255,.5)}50%{box-shadow:0 0 0 14px rgba(60,158,255,0)}}

/* ===== MAP CHOOSER MODAL ===== */
.map-chooser{display:none;position:fixed;inset:0;background:rgba(0,0,0,.5);z-index:3000;align-items:flex-end}
.map-chooser.show{display:flex}
.map-chooser .chooser-panel{background:#fff;width:100%;border-radius:16px 16px 0 0;padding:24px 20px;animation:slideUp .3s ease}
@keyframes slideUp{from{transform:translateY(100%)}to{transform:translateY(0)}}
.map-chooser .chooser-panel h3{text-align:center;color:var(--dark);margin-bottom:16px}
.map-chooser .chooser-panel button{display:block;width:100%;margin:8px 0;padding:14px;font-size:1rem;border:1.5px solid var(--gray-light);border-radius:var(--radius-sm);background:var(--white);cursor:pointer;transition:all .2s;text-align:left}
.map-chooser .chooser-panel button:hover{background:var(--red-light);border-color:var(--red)}
.map-chooser .chooser-panel .cancel{text-align:center;color:var(--gray);background:none;border:none}

/* ===== RESPONSIVE ===== */
@media(max-width:1024px){
  .products-grid{grid-template-columns:repeat(3,1fr)}
}
@media(max-width:768px){
  .menu-toggle{display:block}
  nav{display:none;position:absolute;top:100%;left:0;right:0;background:var(--white);flex-direction:column;padding:16px;box-shadow:var(--shadow-md)}
  nav.open{display:flex}
  header.scrolled nav{background:var(--white)}
  header:not(.scrolled) nav{background:rgba(30,47,63,.95)}
  nav a{color:var(--dark)!important;padding:12px 16px;border-radius:8px}
  header:not(.scrolled) nav a{color:var(--white)!important}
  .about-grid{grid-template-columns:1fr}
  .about-img{height:260px}
  .about-img img{height:260px}
  .products-grid{grid-template-columns:repeat(2,1fr)}
  .adv-grid{grid-template-columns:1fr}
  .cert-grid{grid-template-columns:1fr}
  .proj-grid{grid-template-columns:1fr}
  .contact-grid{grid-template-columns:1fr}
  .map-box{height:280px}
  .form-row{grid-template-columns:1fr}
  .hero{min-height:460px}
  .hero .hero-text h1{font-size:1.7rem}
}
@media(max-width:480px){
  .products-grid{grid-template-columns:1fr}
  .stats-bar .inner{gap:12px}
  .stat-item .num{font-size:1.5rem}
  section{padding:48px 16px}
}

/* ===== LIGHTBOX ===== */
#lightbox{display:none;position:fixed;inset:0;z-index:9999;background:rgba(0,0,0,.92);cursor:zoom-out;align-items:center;justify-content:center}
#lightbox.show{display:flex}
#lightbox img{max-width:95vw;max-height:95vh;object-fit:contain;border-radius:4px;box-shadow:0 4px 40px rgba(0,0,0,.5);transition:transform .3s}
#lightbox .lb-close{position:absolute;top:20px;right:32px;color:#fff;font-size:2.2rem;cursor:pointer;z-index:1;width:44px;height:44px;display:flex;align-items:center;justify-content:center;border-radius:50%;background:rgba(255,255,255,.1);transition:background .2s}
#lightbox .lb-close:hover{background:rgba(255,255,255,.25)}
#lightbox .lb-prev,#lightbox .lb-next{position:absolute;top:50%;transform:translateY(-50%);color:#fff;font-size:2.4rem;cursor:pointer;z-index:1;width:52px;height:52px;display:flex;align-items:center;justify-content:center;border-radius:50%;background:rgba(255,255,255,.08);transition:background .2s}
#lightbox .lb-prev{left:16px}
#lightbox .lb-next{right:16px}
#lightbox .lb-prev:hover,#lightbox .lb-next:hover{background:rgba(255,255,255,.2)}
img.zoomable{cursor:zoom-in}