/* =========================================================
   Chuang Hong Sponge — Static Site Styles
   Theme: rgb(100, 181, 246)  #64B5F6
   ========================================================= */
:root{
  --theme: rgb(100, 181, 246);
  --theme: #64B5F6;
  --theme-dark: #1e88e5;
  --theme-darker: #1565c0;
  --navy: #0e2742;
  --navy-2: #14365c;
  --ink: #1f2d3d;
  --muted: #6b7a8d;
  --line: #e6eef6;
  --bg: #ffffff;
  --bg-soft: #f4f9fe;
  --radius: 16px;
  --shadow: 0 18px 40px rgba(20, 54, 92, .10);
  --shadow-sm: 0 8px 22px rgba(20, 54, 92, .08);
  --container: 1200px;
  --header-h: 78px;
}

*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;overflow-x:hidden}
body{
  font-family:'Inter', system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
  color:var(--ink);
  background:var(--bg);
  line-height:1.7;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
  width:100%;
}
img{max-width:100%;display:block}
a{text-decoration:none;color:inherit}
h1,h2,h3,h4,h5{font-family:'Poppins', system-ui, sans-serif;line-height:1.2;color:var(--navy)}
.container{max-width:var(--container);margin:0 auto;padding:0 22px}

/* ---------- Buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:13px 26px;border-radius:50px;font-weight:600;font-size:15px;
  font-family:'Poppins',sans-serif;cursor:pointer;border:2px solid transparent;
  transition:transform .25s ease, box-shadow .25s ease, background .25s ease, color .25s ease;
  white-space:nowrap;
}
.btn-primary{background:var(--theme);color:#fff;box-shadow:0 10px 24px rgba(100,181,246,.40)}
.btn-primary:hover{background:var(--theme-dark);transform:translateY(-2px);box-shadow:0 14px 30px rgba(30,136,229,.45)}
.btn-outline{background:transparent;color:#fff;border-color:rgba(255,255,255,.75)}
.btn-outline:hover{background:#fff;color:var(--navy);border-color:#fff}
.btn-block{width:100%}
.link-arrow{color:var(--theme-dark);font-weight:600;font-family:'Poppins',sans-serif;transition:gap .2s}
.link-arrow:hover{color:var(--theme-darker)}

/* ---------- Top bar ---------- */
.topbar{background:var(--navy);color:#cfe2f5;font-size:13.5px}
.topbar-inner{display:flex;justify-content:space-between;align-items:center;height:42px;gap:12px;flex-wrap:wrap}
.topbar a{color:#cfe2f5}
.topbar a:hover{color:#fff}
.topbar .dot{opacity:.5;margin:0 4px}
.topbar-right{opacity:.9}

/* ---------- Header ---------- */
.site-header{
  position:fixed;top:42px;left:0;right:0;z-index:100;
  height:var(--header-h);display:flex;align-items:center;
  transition:background .3s ease, box-shadow .3s ease, top .3s ease;
}
.site-header.scrolled{background:#fff;box-shadow:0 6px 24px rgba(14,39,66,.08);top:0}
.header-inner{display:flex;align-items:center;justify-content:space-between;width:100%}
.brand{display:flex;align-items:center;gap:12px;color:#fff}
.site-header.scrolled .brand{color:var(--navy)}
.brand-logo{height:42px;width:auto;display:block}
/* Real logo is white-on-transparent: keep white over the dark hero, invert to dark once the header turns white on scroll */
.site-header.scrolled .brand-logo{filter:invert(1) grayscale(1) brightness(.25)}
.brand-name{font-family:'Poppins',sans-serif;font-weight:700;font-size:19px;letter-spacing:.5px;line-height:1}
.brand-sub{display:block;font-family:'Inter',sans-serif;font-weight:500;font-size:11px;letter-spacing:1.5px;text-transform:uppercase;opacity:.8;margin-top:3px}

.nav{display:flex;align-items:center;gap:26px}
.nav a{color:#eaf3fb;font-weight:500;font-size:15px;position:relative;transition:color .25s}
.site-header.scrolled .nav a{color:var(--ink)}
.nav a:not(.nav-cta)::after{
  content:"";position:absolute;left:0;bottom:-6px;height:2px;width:0;background:var(--theme);transition:width .25s
}
.nav a:not(.nav-cta):hover::after{width:100%}
.nav a:hover{color:var(--theme)}
.site-header.scrolled .nav a:hover{color:var(--theme-dark)}
.nav-cta{padding:9px 20px;font-size:14px}

.nav-toggle{display:none;flex-direction:column;gap:5px;background:none;border:0;cursor:pointer;padding:6px}
.nav-toggle span{width:26px;height:3px;background:#fff;border-radius:3px;transition:.3s}
.site-header.scrolled .nav-toggle span{background:var(--navy)}

/* ---------- Hero ---------- */
.hero{position:relative;height:100vh;min-height:620px;overflow:hidden;display:flex;align-items:center}
.slides{position:absolute;inset:0}
.slide{position:absolute;inset:0;background-size:cover;background-position:center;opacity:0;transform:scale(1.08);transition:opacity 1.2s ease, transform 6s ease}
.slide.active{opacity:1;transform:scale(1)}
.hero-overlay{position:absolute;inset:0;background:linear-gradient(105deg, rgba(8,24,44,.82) 0%, rgba(14,39,66,.55) 45%, rgba(14,39,66,.25) 100%)}
.hero-content{position:relative;z-index:2;color:#fff;max-width:780px;padding:0 22px;margin:0 auto;width:100%;text-align:left}
.hero-eyebrow{text-transform:uppercase;letter-spacing:3px;font-size:13px;font-weight:600;color:var(--theme);margin-bottom:18px}
.hero h1{color:#fff;font-size:clamp(34px,5.2vw,62px);font-weight:800;margin-bottom:22px;text-shadow:0 2px 20px rgba(0,0,0,.3)}
.hero-sub{font-size:clamp(15px,1.6vw,19px);color:#dce9f6;max-width:620px;margin-bottom:34px}
.hero-actions{display:flex;gap:16px;flex-wrap:wrap}
.hero-dots{position:absolute;bottom:34px;left:50%;transform:translateX(-50%);z-index:3;display:flex;gap:10px}
.hero-dots .dot{width:11px;height:11px;border-radius:50%;background:rgba(255,255,255,.4);cursor:pointer;transition:.3s}
.hero-dots .dot.active{background:var(--theme);width:30px;border-radius:6px}
.scroll-down{position:absolute;bottom:30px;right:34px;z-index:3;width:26px;height:42px;border:2px solid rgba(255,255,255,.6);border-radius:14px;display:grid;place-items:start center;padding-top:7px}
.scroll-down span{width:4px;height:8px;border-radius:3px;background:#fff;animation:scrolldot 1.6s infinite}
@keyframes scrolldot{0%{transform:translateY(0);opacity:1}80%{transform:translateY(14px);opacity:0}100%{opacity:0}}

/* ---------- Section base ---------- */
.section{padding:96px 0}
.section-soft{background:var(--bg-soft)}
.section-head{max-width:720px;margin:0 auto 56px;text-align:center}
.eyebrow{text-transform:uppercase;letter-spacing:3px;font-size:13px;font-weight:700;color:var(--theme-dark);margin-bottom:14px}
.section-head h2{font-size:clamp(28px,3.4vw,42px);font-weight:700;margin-bottom:16px}
.section-sub{color:var(--muted);font-size:16.5px}

/* ---------- About ---------- */
.about-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:56px;align-items:center}
.about-text h2{font-size:clamp(26px,3vw,38px);font-weight:700;margin:8px 0 20px}
.about-text p{color:#52606d;margin-bottom:16px}
.about-actions{display:flex;align-items:center;gap:24px;margin-top:26px;flex-wrap:wrap}
.about-media{position:relative}
.about-media img{border-radius:var(--radius);box-shadow:var(--shadow)}
.about-media img:first-child{width:100%}
.about-media-small{position:absolute;right:-22px;bottom:-26px;width:46%!important;border:6px solid #fff!important}

/* ---------- Stats ---------- */
.stats{background:linear-gradient(120deg, var(--navy) 0%, var(--navy-2) 100%);color:#fff;padding:64px 0}
.stats-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;text-align:center}
.stat-num{font-family:'Poppins',sans-serif;font-weight:800;font-size:clamp(38px,5vw,58px);color:var(--theme);line-height:1}
.stat-plus{font-family:'Poppins',sans-serif;font-weight:800;font-size:34px;color:var(--theme);vertical-align:super}
.stat p{margin-top:8px;color:#bcd3ea;font-size:15px;letter-spacing:.5px}

/* ---------- Products ---------- */
.product-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:26px}
.product-card{background:#fff;border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow-sm);border:1px solid var(--line);transition:transform .3s ease, box-shadow .3s ease}
.product-card:hover{transform:translateY(-8px);box-shadow:var(--shadow)}
.product-thumb{overflow:hidden;aspect-ratio:4/3}
.product-thumb img{width:100%;height:100%;object-fit:cover;transition:transform .6s ease}
.product-card:hover .product-thumb img{transform:scale(1.08)}
.product-body{padding:22px 22px 26px}
.product-tag{display:inline-block;background:rgba(100,181,246,.14);color:var(--theme-darker);font-size:12px;font-weight:700;letter-spacing:1px;text-transform:uppercase;padding:5px 12px;border-radius:50px;margin-bottom:12px}
.product-body h3{font-size:19px;font-weight:700;margin-bottom:10px}
.product-body p{color:var(--muted);font-size:14.5px;margin-bottom:16px}

/* ---------- Gallery ---------- */
.gallery-filters{display:flex;flex-wrap:wrap;gap:10px;justify-content:center;margin-bottom:36px}
.filter-btn{background:#fff;border:1.5px solid var(--line);color:var(--muted);padding:9px 20px;border-radius:50px;font-weight:600;font-size:14px;cursor:pointer;transition:.25s;font-family:'Inter',sans-serif}
.filter-btn:hover{border-color:var(--theme);color:var(--theme-dark)}
.filter-btn.active{background:var(--theme);border-color:var(--theme);color:#fff}
.gallery-grid{column-count:4;column-gap:18px}
.gallery-item{display:block;break-inside:avoid;margin-bottom:18px;position:relative;border-radius:14px;overflow:hidden;cursor:pointer;box-shadow:var(--shadow-sm)}
.gallery-item img{width:100%;transition:transform .5s ease}
.gallery-item:hover img{transform:scale(1.06)}
.gallery-cap{position:absolute;left:0;right:0;bottom:0;padding:14px 16px;color:#fff;font-family:'Poppins',sans-serif;font-weight:600;font-size:14px;background:linear-gradient(to top, rgba(8,24,44,.8), transparent);opacity:0;transform:translateY(8px);transition:.3s}
.gallery-item:hover .gallery-cap{opacity:1;transform:translateY(0)}
.gallery-item.hide{display:none}

/* ---------- Factory ---------- */
.factory-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.factory-card{background:#fff;border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow-sm);border:1px solid var(--line)}
.factory-card img{width:100%;aspect-ratio:4/3;object-fit:cover}
.factory-card figcaption{padding:20px}
.factory-card h4{font-size:17px;margin-bottom:8px}
.factory-card p{color:var(--muted);font-size:14px}

/* ---------- Certifications ---------- */
.cert-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:22px}
.cert-card{background:#fff;border-radius:var(--radius);padding:30px 22px;text-align:center;box-shadow:var(--shadow-sm);border:1px solid var(--line);transition:.3s}
.cert-card:hover{transform:translateY(-6px);box-shadow:var(--shadow)}
.cert-badge{width:64px;height:64px;margin:0 auto 16px;border-radius:50%;background:linear-gradient(135deg,var(--theme),var(--theme-dark));color:#fff;display:grid;place-items:center;font-family:'Poppins',sans-serif;font-weight:800;font-size:22px;box-shadow:0 10px 22px rgba(100,181,246,.45)}
.cert-card h4{font-size:17px;margin-bottom:8px}
.cert-card p{color:var(--muted);font-size:13.5px}
.cert-card a{color:var(--theme-dark);font-weight:600}

/* ---------- Videos ---------- */
.video-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.video-card{background:#000;border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow-sm);position:relative}
.video-card video{width:100%;display:block;aspect-ratio:4/3;object-fit:cover;background:#0e2742}
.video-card .play-badge{position:absolute;inset:0;display:grid;place-items:center;pointer-events:none}
.video-card .play-badge span{width:62px;height:62px;border-radius:50%;background:rgba(100,181,246,.92);display:grid;place-items:center;color:#fff;font-size:22px;box-shadow:0 10px 26px rgba(0,0,0,.45);transition:.3s}
.video-card:hover .play-badge span{transform:scale(1.12)}
.video-card.playing .play-badge{display:none}
.video-cap{position:absolute;left:0;top:0;padding:12px 16px;color:#fff;font-family:'Poppins',sans-serif;font-weight:600;font-size:14px;text-shadow:0 1px 6px rgba(0,0,0,.65);pointer-events:none;background:linear-gradient(to bottom, rgba(8,24,44,.55), transparent)}

/* ---------- Contact ---------- */
.contact-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:40px;align-items:start}
.contact-form{background:#fff;border-radius:var(--radius);padding:34px;box-shadow:var(--shadow);border:1px solid var(--line)}
.field{margin-bottom:18px}
.field label{display:block;font-weight:600;font-size:14px;margin-bottom:7px;color:var(--navy)}
.field input,.field textarea{
  width:100%;padding:13px 15px;border:1.5px solid var(--line);border-radius:11px;
  font-family:'Inter',sans-serif;font-size:15px;color:var(--ink);background:#fbfdff;transition:.25s;resize:vertical;
}
.field input:focus,.field textarea:focus{outline:none;border-color:var(--theme);background:#fff;box-shadow:0 0 0 4px rgba(100,181,246,.15)}
.form-note{font-size:13px;color:var(--muted);margin-top:12px;text-align:center}

.contact-info{background:var(--navy);color:#dce9f6;border-radius:var(--radius);padding:34px;box-shadow:var(--shadow)}
.contact-info h3{color:#fff;font-size:21px;margin-bottom:18px}
.info-list{list-style:none}
.info-list li{display:flex;align-items:flex-start;gap:12px;padding:9px 0;font-size:15px;border-bottom:1px solid rgba(255,255,255,.08)}
.info-list li:last-child{border-bottom:0}
.info-list a{color:var(--theme)}
.info-map{margin-top:20px;border-radius:12px;overflow:hidden}
.info-map img{width:100%;height:140px;object-fit:cover}

/* ---------- Footer ---------- */
.site-footer{background:var(--navy-2);color:#b9cfe6;padding:60px 0 0}
.footer-bottom a{color:var(--theme);font-weight:600;text-decoration:none}
.footer-bottom a:hover{text-decoration:underline}
.footer-logo{height:46px;width:auto;margin-bottom:16px;display:block}
.footer-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:34px;padding-bottom:42px}
.footer-brand h4{color:#fff;font-size:20px;letter-spacing:1px;margin-bottom:10px}
.footer-brand p{font-size:14px;color:#9fb8d2;max-width:280px}
.footer-col h5{color:#fff;font-size:15px;text-transform:uppercase;letter-spacing:1.5px;margin-bottom:16px}
.footer-col a{display:block;color:#b9cfe6;font-size:14.5px;padding:6px 0;transition:.2s}
.footer-col a:hover{color:var(--theme);padding-left:5px}
.footer-bottom{border-top:1px solid rgba(255,255,255,.1);padding:20px 0;font-size:13px;color:#8ba6c4}
.footer-bottom .container{display:flex;justify-content:space-between;flex-wrap:wrap;gap:8px}

/* ---------- Lightbox ---------- */
.lightbox{position:fixed;inset:0;background:rgba(8,20,38,.92);display:none;align-items:center;justify-content:center;z-index:200;padding:30px}
.lightbox.open{display:flex}
.lightbox img{max-width:92%;max-height:88%;border-radius:8px;box-shadow:0 20px 60px rgba(0,0,0,.6)}
.lightbox-close{position:absolute;top:22px;right:28px;background:none;border:0;color:#fff;font-size:42px;cursor:pointer;line-height:1;opacity:.85}
.lightbox-close:hover{opacity:1}

/* ---------- Reveal animation ---------- */
.reveal{opacity:0;transform:translateY(28px);transition:opacity .7s ease, transform .7s ease}
.reveal.in{opacity:1;transform:none}

/* ---------- Responsive ---------- */
@media (max-width:1080px){
  .product-grid,.factory-grid,.video-grid{grid-template-columns:repeat(2,1fr)}
  .cert-grid{grid-template-columns:repeat(3,1fr)}
  .gallery-grid{column-count:3}
  .about-grid{grid-template-columns:1fr;gap:40px}
  .about-media-small{right:10px}
  .contact-grid{grid-template-columns:1fr}
}
@media (max-width:860px){
  .nav{
    position:fixed;top:var(--header-h);right:0;height:calc(100vh - var(--header-h));width:78%;max-width:320px;
    background:#fff;flex-direction:column;align-items:flex-start;gap:4px;padding:24px 26px;
    transform:translateX(100%);transition:transform .35s ease;box-shadow:-10px 0 40px rgba(0,0,0,.15);overflow-y:auto;
  }
  .site-header.scrolled .nav{top:var(--header-h)}
  .nav.open{transform:translateX(0)}
  .nav a{color:var(--ink)!important;font-size:17px;padding:12px 0;width:100%;border-bottom:1px solid var(--line)}
  .nav a::after{display:none}
  .nav-cta{margin-top:14px;width:100%;justify-content:center}
  .nav-toggle{display:flex}
  .nav-toggle.open span:nth-child(1){transform:translateY(8px) rotate(45deg)}
  .nav-toggle.open span:nth-child(2){opacity:0}
  .nav-toggle.open span:nth-child(3){transform:translateY(-8px) rotate(-45deg)}
  .stats-grid{grid-template-columns:repeat(2,1fr);gap:32px 16px}
}
@media (max-width:640px){
  .section{padding:64px 0}
  .topbar-right{display:none}
  .topbar-inner{justify-content:center;height:auto;padding:7px 0}
  .topbar-left{display:flex;align-items:center;gap:8px;font-size:11.5px;white-space:nowrap}
  .topbar-left .dot{margin:0}
  .hero{height:auto;min-height:0;padding:140px 0 90px}
  .hero-content{text-align:center}
  .hero-actions{justify-content:center}
  .scroll-down{display:none}
  .product-grid,.factory-grid,.video-grid{grid-template-columns:1fr}
  .cert-grid{grid-template-columns:repeat(2,1fr)}
  .gallery-grid{column-count:2}
  .footer-grid{grid-template-columns:1fr 1fr}
  .about-media-small{position:static;width:70%!important;margin:16px auto 0;border:5px solid #fff!important}
  .brand-logo{height:36px}
  .brand-name{font-size:16px}
  .brand-sub{font-size:9px;letter-spacing:1px}
}
@media (max-width:380px){
  .gallery-grid{column-count:1}
  .footer-grid{grid-template-columns:1fr}
  .topbar-left .loc,.topbar-left .dot{display:none}
  .brand-sub{display:none}
}
@media (max-width:380px){
  .gallery-grid{column-count:1}
  .footer-grid{grid-template-columns:1fr}
  .topbar-left .loc,.topbar-left .dot{display:none}
}