/* Bao Bì Trung Quân — style.css */
:root{
  --ivory:#FAF7F2;
  --cream:#F2EFE9;
  --sand:#E2DDD3;
  --ink:#16234A;
  --ink-2:#3C4566;
  --muted:#7A8098;
  --gold:#C8202A;
  --gold-2:#E8666C;
  --line:rgba(22,35,74,.12);
  --white:#fff;
  --serif:"Cormorant Garamond","Times New Roman",serif;
  --sans:"Be Vietnam Pro",system-ui,-apple-system,"Segoe UI",sans-serif;
  --wrap:1200px;
  --radius:2px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;overflow-x:clip}
body{overflow-x:clip}
body{font-family:var(--sans);font-weight:300;color:var(--ink);background:var(--ivory);line-height:1.7;font-size:16px;-webkit-font-smoothing:antialiased}
img,svg{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
.wrap{max-width:var(--wrap);margin:0 auto;padding:0 24px}
h1,h2,h3,h4{font-family:var(--serif);font-weight:500;line-height:1.15;letter-spacing:.01em}
.eyebrow{font-size:12px;letter-spacing:.28em;text-transform:uppercase;color:var(--gold);font-weight:500}
.lead{font-size:18px;color:var(--ink-2);max-width:620px}
.btn{display:inline-flex;align-items:center;gap:10px;padding:15px 30px;border:1px solid var(--ink);font-size:13px;letter-spacing:.18em;text-transform:uppercase;font-weight:500;transition:.3s;cursor:pointer;background:transparent;font-family:var(--sans);color:var(--ink)}
.btn:hover{background:var(--ink);color:var(--ivory)}
.btn-dark{background:var(--ink);color:var(--ivory)}
.btn-dark:hover{background:var(--gold);border-color:var(--gold)}
.btn-gold{background:var(--gold);border-color:var(--gold);color:#fff}
.btn-gold:hover{background:var(--ink);border-color:var(--ink)}

/* Header */
.topbar{background:var(--ink);color:#D5D9E6;font-size:12.5px;letter-spacing:.04em}
.topbar .wrap{display:flex;justify-content:space-between;gap:16px;padding-top:8px;padding-bottom:8px}
.topbar a:hover{color:var(--gold-2)}
.header{position:sticky;top:0;z-index:50;background:rgba(250,247,242,.94);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.header .wrap{display:flex;align-items:center;justify-content:space-between;height:80px}
.logo{display:flex;align-items:center;gap:12px}
.logo img{height:46px;width:auto}
.footer .logo img{height:54px}
.logo-text{font-family:var(--serif);font-size:24px;font-weight:600;letter-spacing:.06em;line-height:1}
.logo-text small{display:block;font-family:var(--sans);font-size:9.5px;letter-spacing:.32em;color:var(--gold);font-weight:500;margin-top:5px}
.nav{display:flex;gap:36px}
.nav a{font-size:13px;letter-spacing:.14em;text-transform:uppercase;font-weight:400;position:relative;padding:6px 0}
.nav a::after{content:"";position:absolute;left:0;bottom:0;width:0;height:1px;background:var(--gold);transition:.3s}
.nav a:hover::after,.nav a.active::after{width:100%}
.nav a.active{color:var(--gold)}
.header-cta{font-size:12px;padding:12px 22px}
.menu-btn{display:none;background:none;border:0;width:40px;height:40px;cursor:pointer}
.menu-btn span{display:block;width:24px;height:1px;background:var(--ink);margin:6px auto;transition:.3s}

/* Hero */
.hero{position:relative;overflow:hidden;background:linear-gradient(120deg,var(--ivory) 0%,var(--cream) 60%,var(--sand) 100%)}
.hero .wrap{display:grid;grid-template-columns:1.05fr 1fr;align-items:center;gap:40px;min-height:640px;padding-top:60px;padding-bottom:60px}
.hero h1{font-size:clamp(42px,6vw,76px);margin:22px 0 24px}
.hero h1 em{font-style:italic;color:var(--gold)}
.hero .lead{margin-bottom:38px}
.hero-actions{display:flex;gap:14px;flex-wrap:wrap}
.hero-art{position:relative;display:flex;justify-content:center;align-items:flex-end;gap:6px;height:480px}
.hero-art .b{filter:drop-shadow(0 30px 30px rgba(22,35,74,.16))}
.hero-art::before{content:"";position:absolute;width:420px;height:420px;border-radius:50%;background:radial-gradient(circle,#fff 0%,rgba(255,255,255,0) 70%);top:20px;left:50%;transform:translateX(-50%)}
.hero-art::after{content:"";position:absolute;bottom:0;left:8%;right:8%;height:1px;background:var(--gold-2)}
.hero-stats{display:flex;gap:44px;margin-top:54px;padding-top:30px;border-top:1px solid var(--line)}
.hero-stats b{font-family:var(--serif);font-size:38px;font-weight:500;display:block;line-height:1}
.hero-stats span{font-size:12px;letter-spacing:.12em;text-transform:uppercase;color:var(--muted)}

/* Sections */
.section{padding:110px 0}
.section-alt{background:var(--white)}
.section-dark{background:var(--ink);color:var(--ivory)}
.section-dark .lead{color:#C9CEDD}
.section-head{display:flex;justify-content:space-between;align-items:flex-end;gap:30px;margin-bottom:60px;flex-wrap:wrap}
.section-head h2{font-size:clamp(34px,4vw,52px);margin-top:14px}
.center{text-align:center}
.center .lead{margin:18px auto 0}

/* Category grid */
.cats{display:grid;grid-template-columns:repeat(6,1fr);gap:1px;background:var(--line);border:1px solid var(--line)}
.cat{background:var(--ivory);padding:40px 28px 34px;text-align:center;transition:.4s;position:relative}
.section-alt .cat{background:var(--white)}
.cat:hover{background:var(--cream)}
.cat .art{height:170px;display:flex;align-items:flex-end;justify-content:center;margin-bottom:26px;transition:.4s}
.cat:hover .art{transform:translateY(-6px)}
.cat h3{font-size:24px;margin-bottom:6px}
.cat p{font-size:13.5px;color:var(--muted)}
.cat .more{display:inline-block;margin-top:16px;font-size:11px;letter-spacing:.2em;text-transform:uppercase;color:var(--gold)}

/* Features */
.features{display:grid;grid-template-columns:repeat(4,1fr);gap:40px}
.feature .num{font-family:var(--serif);font-size:15px;color:var(--gold);letter-spacing:.1em}
.feature h3{font-size:24px;margin:14px 0 10px}
.feature p{font-size:14.5px;color:var(--ink-2)}
.section-dark .feature p{color:#C9CEDD}
.feature .ic{width:46px;height:46px;border:1px solid var(--gold-2);border-radius:50%;display:flex;align-items:center;justify-content:center;margin-bottom:22px;color:var(--gold-2)}

/* Split */
.split{display:grid;grid-template-columns:1fr 1fr;gap:80px;align-items:center}
.split-art{background:var(--cream);aspect-ratio:4/5;display:flex;align-items:flex-end;justify-content:center;gap:10px;padding:50px 30px;position:relative}
.split-art::before{content:"";position:absolute;inset:22px;border:1px solid rgba(200,32,42,.25)}
.split h2{font-size:clamp(32px,4vw,48px);margin:14px 0 22px}
.split p{color:var(--ink-2);margin-bottom:16px}
.checks{list-style:none;margin:26px 0 34px}
.checks li{padding:10px 0 10px 32px;position:relative;border-bottom:1px solid var(--line);font-size:15px}
.checks li::before{content:"";position:absolute;left:4px;top:19px;width:12px;height:6px;border-left:1.5px solid var(--gold);border-bottom:1.5px solid var(--gold);transform:rotate(-45deg)}

/* Process */
.steps{display:grid;grid-template-columns:repeat(5,1fr);gap:0;counter-reset:s}
.step{padding:0 22px;border-left:1px solid rgba(230,220,204,.2);position:relative}
.step:first-child{border-left:0;padding-left:0}
.step b{font-family:var(--serif);font-size:54px;color:var(--gold-2);font-weight:400;line-height:1;display:block;margin-bottom:16px}
.step h4{font-family:var(--sans);font-size:15px;font-weight:500;letter-spacing:.06em;margin-bottom:8px;text-transform:uppercase}
.step p{font-size:14px;color:#C9CEDD}

/* Products */
.filters{display:flex;gap:10px;flex-wrap:wrap;margin-bottom:46px}
.filter{padding:10px 20px;border:1px solid var(--line);background:transparent;font-family:var(--sans);font-size:12.5px;letter-spacing:.1em;text-transform:uppercase;cursor:pointer;color:var(--ink-2);transition:.25s}
.filter:hover{border-color:var(--ink)}
.filter.on{background:var(--ink);color:var(--ivory);border-color:var(--ink)}
.products{display:grid;grid-template-columns:repeat(4,1fr);gap:28px}
.product{background:var(--white);transition:.35s;display:flex;flex-direction:column}
.product:hover{box-shadow:0 20px 40px rgba(22,35,74,.08);transform:translateY(-4px)}
.product .pimg{background:linear-gradient(180deg,var(--cream),var(--ivory));height:260px;display:flex;align-items:flex-end;justify-content:center;padding-bottom:26px;position:relative}
.product .tag{position:absolute;top:14px;left:14px;font-size:10.5px;letter-spacing:.16em;text-transform:uppercase;background:var(--ivory);padding:5px 10px;color:var(--gold)}
.product .pbody{padding:22px 22px 24px;display:flex;flex-direction:column;flex:1}
.product .code{font-size:11px;letter-spacing:.18em;color:var(--muted)}
.product h3{font-size:22px;margin:6px 0 12px}
.specs{list-style:none;font-size:13px;color:var(--ink-2);margin-bottom:18px}
.specs li{display:flex;justify-content:space-between;padding:5px 0;border-bottom:1px dashed var(--line)}
.specs li span:first-child{color:var(--muted)}
.product .btn{margin-top:auto;justify-content:center;padding:12px;font-size:11.5px}
.product.hide{display:none}

/* Page hero */
.page-hero{background:linear-gradient(120deg,var(--ivory),var(--cream));padding:90px 0 80px;border-bottom:1px solid var(--line)}
.page-hero h1{font-size:clamp(40px,5vw,64px);margin:14px 0 16px}
.crumbs{font-size:12.5px;color:var(--muted);letter-spacing:.06em;margin-bottom:6px}
.crumbs a:hover{color:var(--gold)}

/* Values / about */
.values{display:grid;grid-template-columns:repeat(3,1fr);gap:1px;background:var(--line);border:1px solid var(--line)}
.value{background:var(--white);padding:46px 36px}
.value h3{font-size:28px;margin:12px 0 12px}
.value p{color:var(--ink-2);font-size:15px}
.quote{font-family:var(--serif);font-size:clamp(26px,3vw,38px);font-style:italic;line-height:1.35;max-width:880px;margin:0 auto;text-align:center}
.quote::before{content:"“";display:block;font-size:90px;color:var(--gold);line-height:.6;margin-bottom:16px}

/* Blog */
.posts{display:grid;grid-template-columns:repeat(3,1fr);gap:34px}
.post .thumb{aspect-ratio:4/3;background:var(--cream);display:flex;align-items:flex-end;justify-content:center;gap:4px;padding-bottom:28px;margin-bottom:22px;overflow:hidden;transition:.4s}
.post:hover .thumb{background:var(--sand)}
.post .meta{font-size:11.5px;letter-spacing:.16em;text-transform:uppercase;color:var(--gold)}
.post h3{font-size:26px;margin:10px 0 10px;transition:.25s}
.post:hover h3{color:var(--gold)}
.post p{font-size:14.5px;color:var(--ink-2)}
.article{max-width:760px;margin:0 auto}
.article h2{font-size:34px;margin:44px 0 14px}
.article p,.article li{font-size:17px;color:var(--ink-2);margin-bottom:16px}
.article ul{padding-left:22px;margin-bottom:16px}
.article .note{background:var(--cream);border-left:2px solid var(--gold);padding:22px 26px;margin:30px 0;font-size:16px}

/* Contact */
.contact{display:grid;grid-template-columns:1fr 1.25fr;gap:70px}
.info-item{display:flex;gap:18px;padding:22px 0;border-bottom:1px solid var(--line)}
.info-item .ic{width:44px;height:44px;flex:none;border:1px solid var(--gold-2);border-radius:50%;display:flex;align-items:center;justify-content:center;color:var(--gold)}
.info-item h4{font-family:var(--sans);font-size:12px;letter-spacing:.2em;text-transform:uppercase;font-weight:500;color:var(--muted);margin-bottom:4px}
.info-item p{font-size:16px}
.form{background:var(--white);padding:48px}
.form h3{font-size:32px;margin-bottom:8px}
.form .sub{color:var(--muted);font-size:14px;margin-bottom:30px}
.row{display:grid;grid-template-columns:1fr 1fr;gap:18px}
.field{margin-bottom:18px}
.field label{display:block;font-size:11.5px;letter-spacing:.16em;text-transform:uppercase;color:var(--muted);margin-bottom:8px;font-weight:500}
.field input,.field select,.field textarea{width:100%;padding:14px 16px;border:1px solid var(--line);background:var(--ivory);font-family:var(--sans);font-size:15px;color:var(--ink);font-weight:300;border-radius:var(--radius);transition:.25s}
.field input:focus,.field select:focus,.field textarea:focus{outline:0;border-color:var(--gold);background:#fff}
.field textarea{min-height:130px;resize:vertical}
.form-note{font-size:13px;color:var(--muted);margin-top:14px}
.form-ok{display:none;background:var(--cream);border-left:2px solid var(--gold);padding:16px 20px;margin-top:18px;font-size:14.5px}
.maps{display:grid;grid-template-columns:1fr 1fr;gap:40px;margin-top:80px}
.map-item h4{font-family:var(--sans);font-size:12px;letter-spacing:.2em;text-transform:uppercase;color:var(--gold);font-weight:500;margin-bottom:6px}
.map-item p{margin-bottom:16px;color:var(--ink-2)}
.map-item .btn{margin-top:16px;padding:12px 24px;font-size:12px}
.map{background:var(--cream);height:320px}
@media (max-width:860px){.maps{grid-template-columns:1fr}}
.map iframe{width:100%;height:100%;border:0}

/* CTA band */
.cta{background:var(--gold);color:#fff;padding:80px 0}
.cta .wrap{display:flex;justify-content:space-between;align-items:center;gap:30px;flex-wrap:wrap}
.cta h2{font-size:clamp(30px,3.6vw,46px);max-width:640px}
.cta .btn{border-color:#fff;color:#fff}
.cta .btn:hover{background:#fff;color:var(--ink)}

/* Footer */
.footer{background:var(--ink);color:#D5D9E6;padding:80px 0 0;font-size:14px}
.footer .grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1.2fr;gap:50px;padding-bottom:60px}
.footer .logo-text{color:var(--ivory)}
.footer p{margin-top:18px;max-width:300px;color:#AEB5CC}
.footer h4{font-family:var(--sans);font-size:12px;letter-spacing:.22em;text-transform:uppercase;color:var(--ivory);font-weight:500;margin-bottom:20px}
.footer ul{list-style:none}
.footer li{margin-bottom:10px;color:#AEB5CC}
.footer a:hover{color:var(--gold-2)}
.copy{border-top:1px solid rgba(230,220,204,.14);padding:22px 0;font-size:12.5px;color:#8890AA;display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap}

/* Floating contact */
.float{position:fixed;right:20px;bottom:20px;z-index:60;display:flex;flex-direction:column;gap:10px}
.float a{width:52px;height:52px;border-radius:50%;display:flex;align-items:center;justify-content:center;color:#fff;box-shadow:0 8px 22px rgba(0,0,0,.18);transition:.25s;font-weight:600;font-size:13px}
.float a:hover{transform:scale(1.08)}
.float .zalo{background:#0068FF}
.float .call{background:var(--gold)}

/* Reveal */
.reveal{opacity:0;transform:translateY(24px);transition:opacity .9s ease,transform .9s ease}
.reveal.in{opacity:1;transform:none}

/* Responsive */
@media (max-width:1024px){
  .cats{grid-template-columns:repeat(3,1fr)}
  .products{grid-template-columns:repeat(3,1fr)}
  .features{grid-template-columns:repeat(2,1fr)}
  .steps{grid-template-columns:repeat(3,1fr);row-gap:40px}
  .step:nth-child(4){border-left:0;padding-left:0}
  .footer .grid{grid-template-columns:1fr 1fr}
}
@media (max-width:860px){
  .nav{position:fixed;inset:0;background:var(--ivory);flex-direction:column;gap:0;padding:110px 30px;opacity:0;visibility:hidden;transition:.3s}
  .nav.open{opacity:1;visibility:visible}
  .nav a{padding:16px 0;border-bottom:1px solid var(--line);font-size:14px}
  .menu-btn{display:block;z-index:70;position:relative}
  .menu-btn.x span:nth-child(1){transform:translateY(7px) rotate(45deg)}
  .menu-btn.x span:nth-child(2){opacity:0}
  .menu-btn.x span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
  .header-cta{display:none}
  .hero .wrap,.split,.contact{grid-template-columns:1fr}
  .hero .wrap{min-height:auto;padding-top:50px;gap:10px}
  .hero-art{height:340px;order:-1}
  .hero-art svg{height:auto}
  .hero-art .b1{width:22%}.hero-art .b2{width:30%}.hero-art .b3{width:24%}.hero-art .b4{width:20%}
  .split{gap:40px}
  .values,.posts{grid-template-columns:1fr}
  .topbar .hide-sm{display:none}
  .section{padding:80px 0}
}
@media (max-width:640px){
  .wrap{padding:0 16px}
  .cats,.products{grid-template-columns:1fr 1fr;gap:14px}
  .cats{gap:1px}
  .cat{padding:28px 12px}
  .cat .art{height:120px}
  .cat .art svg{height:120px;width:auto}
  .cat h3{font-size:20px}
  .product .pimg{height:190px}
  .product .pimg svg{height:150px;width:auto}
  .product .pbody{padding:16px 14px 18px}
  .product h3{font-size:19px}
  .specs{font-size:12px}
  .specs li{gap:6px}
  .specs li span:last-child{text-align:right}
  .product .btn{letter-spacing:.06em;padding:11px 6px}
  .filter{padding:9px 14px;font-size:11.5px}
  .features{grid-template-columns:1fr}
  .steps{grid-template-columns:1fr}
  .step{border-left:0;padding:0 0 0 0}
  .hero-stats{gap:24px}
  .hero-stats b{font-size:30px}
  .row{grid-template-columns:1fr}
  .form{padding:30px 20px}
  .footer .grid{grid-template-columns:1fr}
  .logo img{height:38px}
}

/* Product photos + lightbox */
.product .pimg.photo{padding:0;height:auto;aspect-ratio:1/1;overflow:hidden;cursor:zoom-in;display:block}
.product .pimg.photo img{width:100%;height:100%;object-fit:cover;transition:transform .6s}
.product:hover .pimg.photo img{transform:scale(1.04)}
.product .pimg.photo .tag{z-index:2}
.lb{position:fixed;inset:0;z-index:100;background:rgba(10,16,36,.92);display:none;align-items:center;justify-content:center;padding:20px}
.lb.on{display:flex}
.lb img{max-width:100%;max-height:88vh;box-shadow:0 20px 60px rgba(0,0,0,.4)}
.lb button{position:absolute;background:none;border:0;color:#fff;font-size:34px;cursor:pointer;padding:10px 16px;line-height:1}
.lb .x{top:10px;right:10px}.lb .pv{left:6px;top:50%;transform:translateY(-50%)}.lb .nx{right:6px;top:50%;transform:translateY(-50%)}
@media (max-width:640px){.product .pimg.photo{height:auto}}