:root{
    --red-deep:#9E1B20;
    --red:#B3242A;
    --red-bright:#C62F31;
    --red-line:rgba(179,36,42,0.25);
    --gold:#C9A227;
    --gold-light:#E8C766;
    --gold-deep:#8B6914;
    --zalo:#0068FF;
    --zalo-light:#2D95FF;
    --zalo-deep:#0052CC;
    --ivory:#FFFBF2;
    --ivory-2:#F7ECD3;
    --cream-dark:#F0E0B8;
    --text-dark:#2A1B14;
    --text-soft:#78624E;
    --shadow:0 20px 44px -24px rgba(158,27,32,0.28);
    --radius:16px;
  }
  *{box-sizing:border-box;}
  html{scroll-behavior:smooth;}
  body{
    margin:0;
    background:var(--ivory);
    color:var(--text-dark);
    font-family:'Be Vietnam Pro', sans-serif;
    -webkit-font-smoothing:antialiased;
    overflow-x:hidden;
    padding-bottom:82px;
  }
  h1,h2,h3,.display{font-family:'Fraunces', serif;font-weight:600;letter-spacing:-0.01em;margin:0;}
  a{color:inherit;text-decoration:none;}
  img{max-width:100%;display:block;}
  .container{max-width:1140px;margin:0 auto;padding:0 24px;}
  .eyebrow{display:inline-flex;align-items:center;gap:9px;font-size:12.5px;letter-spacing:0.16em;text-transform:uppercase;color:var(--red-bright);font-weight:700;}
  .eyebrow::before{content:"";width:24px;height:1px;background:var(--gold-deep);display:inline-block;}
  .on-red .eyebrow{color:var(--gold-light);}
  .on-red .eyebrow::before{background:var(--gold-light);}

  /* ---------- Top bar ---------- */
  .topbar{background:var(--ivory-2);color:var(--text-dark);font-size:12.5px;border-bottom:1px solid var(--cream-dark);}
  .topbar .container{display:flex;justify-content:space-between;align-items:center;padding:9px 24px;gap:12px;flex-wrap:wrap;}
  .topbar span{color:var(--text-soft);}
  .topbar a.badge{color:var(--red-bright);font-weight:700;}

  /* ---------- Header ---------- */
  header.site{position:sticky;top:0;z-index:50;background:rgba(255,251,242,0.92);backdrop-filter:blur(8px);border-bottom:1px solid var(--cream-dark);}
  .nav{display:flex;align-items:center;justify-content:space-between;padding:13px 24px;}
  .brand{display:flex;align-items:center;gap:11px;font-family:'Fraunces',serif;font-size:16.5px;font-weight:600;color:var(--red-deep);line-height:1.15;}
  .brand .mark{width:36px;height:36px;flex:none;}
  .brand small{display:block;font-family:'Be Vietnam Pro',sans-serif;font-size:10px;font-weight:600;letter-spacing:0.06em;color:var(--gold-deep);text-transform:uppercase;}
  .nav-cta{display:flex;gap:10px;}
  .btn{display:inline-flex;align-items:center;gap:8px;padding:11px 20px;border-radius:999px;font-weight:700;font-size:14px;cursor:pointer;border:1px solid transparent;white-space:nowrap;}
  .btn-red{background:linear-gradient(180deg,var(--red-bright),var(--red-deep));color:#FFF6E9;box-shadow:0 12px 24px -12px rgba(158,27,32,0.55);}
  .btn-gold{background:linear-gradient(180deg,var(--gold-light),var(--gold));color:#2A1B08;box-shadow:0 12px 24px -12px rgba(201,162,39,0.5);}
  .btn-outline-red{color:var(--red-bright);border-color:rgba(179,36,42,0.4);}
  @media(max-width:640px){.nav-cta .btn-outline-red{display:none;}}

  /* ---------- Hero ---------- */
  .hero{
    position:relative;
    background:linear-gradient(150deg,#CC3A38 0%, var(--red) 45%, var(--red-deep) 100%);
    color:#FFF6E9;
    padding:56px 0 110px;
    overflow:hidden;
  }
  .hero .pattern{position:absolute;inset:0;opacity:0.14;pointer-events:none;}
  .hero .pattern svg{width:100%;height:100%;}
  .hero::after{content:"";position:absolute;inset:auto -10% -55% -10%;height:300px;background:radial-gradient(50% 100% at 50% 100%,rgba(232,199,102,0.35),transparent 70%);pointer-events:none;}
  .hero-grid{position:relative;display:grid;grid-template-columns:1.05fr 0.95fr;gap:50px;align-items:center;}
  @media(max-width:900px){.hero-grid{grid-template-columns:1fr;}}
  .cert-badge{display:inline-flex;align-items:center;gap:10px;background:rgba(255,246,233,0.16);border:1px solid rgba(232,199,102,0.55);padding:7px 14px 7px 7px;border-radius:999px;margin-bottom:20px;}
  .cert-badge .dot{width:28px;height:28px;border-radius:50%;background:linear-gradient(160deg,var(--gold-light),var(--gold-deep));display:flex;align-items:center;justify-content:center;font-size:14px;}
  .cert-badge span{font-size:12px;font-weight:700;letter-spacing:0.03em;color:#FFF3DC;}
  .hero h1{font-size:clamp(32px,5vw,55px);line-height:1.08;margin:0 0 20px;}
  .hero h1 em{font-style:normal;color:var(--gold-light);}
  .hero p.lead{font-size:17px;line-height:1.68;color:#FCEADC;max-width:520px;margin-bottom:28px;}
  .hero-cta{display:flex;gap:12px;flex-wrap:wrap;}
  .btn-zalo{background:linear-gradient(180deg,var(--zalo-light),var(--zalo));color:#fff;box-shadow:0 12px 24px -12px rgba(0,104,255,0.55);}
  .hero-trust{margin-top:36px;display:flex;gap:0;flex-wrap:wrap;border-top:1px solid rgba(232,199,102,0.32);padding-top:22px;}
  .hero-trust div{padding-right:28px;margin-right:28px;border-right:1px solid rgba(232,199,102,0.25);font-size:12.5px;color:#FBDFC6;}
  .hero-trust div:last-child{border-right:none;}
  .hero-trust b{display:block;font-family:'Fraunces',serif;font-size:20px;color:var(--gold-light);font-weight:600;}
  .hero-visual{position:relative;padding:10px;border-radius:22px;background:linear-gradient(160deg,rgba(232,199,102,0.65),rgba(255,246,233,0.15));box-shadow:var(--shadow);}
  .hero-visual .frame{border-radius:16px;overflow:hidden;border:1px solid rgba(232,199,102,0.6);position:relative;}
  .hero-visual img{width:100%;height:100%;object-fit:cover;aspect-ratio:4/5;}
  .hero-visual .tag{position:absolute;left:14px;bottom:14px;background:rgba(158,27,32,0.85);backdrop-filter:blur(4px);color:#FFF3DC;padding:9px 14px;border-radius:10px;font-size:12px;font-weight:700;border:1px solid rgba(232,199,102,0.45);}
  .hero-visual .corner{position:absolute;width:26px;height:26px;border:2px solid var(--gold-light);opacity:0.9;}
  .hero-visual .corner.tl{top:-4px;left:-4px;border-right:none;border-bottom:none;}
  .hero-visual .corner.br{bottom:-4px;right:-4px;border-left:none;border-top:none;}

  /* ---------- Section shell ---------- */
  section{padding:76px 0;position:relative;}
  .section-head{max-width:640px;margin-bottom:44px;}
  .section-head h2{font-size:clamp(26px,3.4vw,38px);margin-top:14px;line-height:1.15;color:var(--text-dark);}
  .section-head p{color:var(--text-soft);font-size:16px;line-height:1.6;margin-top:14px;}
  .on-red .section-head h2{color:#FFF6E9;}
  .on-red .section-head p{color:#FBDFC6;}

  /* ---------- Products ---------- */
  .products{background:var(--ivory);}
  .product-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px;}
  @media(max-width:960px){.product-grid{grid-template-columns:repeat(2,1fr);}}
  @media(max-width:520px){.product-grid{grid-template-columns:1fr;}}
  .p-card{background:#fff;border-radius:var(--radius);overflow:hidden;box-shadow:0 14px 28px -22px rgba(42,27,20,0.35);border:1px solid var(--cream-dark);transition:transform .25s ease, box-shadow .25s ease;position:relative;}
  .p-card:hover{transform:translateY(-6px);box-shadow:0 20px 34px -20px rgba(42,27,20,0.4);}
  .p-card .thumb{aspect-ratio:1/1;overflow:hidden;background:var(--ivory-2);position:relative;padding:8px;}
  .p-card .thumb .inner{width:100%;height:100%;border-radius:10px;overflow:hidden;border:1px solid var(--cream-dark);}
  .p-card .thumb img{width:100%;height:100%;object-fit:cover;}
  .p-card .body{padding:16px 18px 20px;}
  .p-card .num{font-family:'Fraunces',serif;color:var(--gold-deep);font-size:12.5px;font-weight:700;letter-spacing:0.08em;}
  .p-card h3{font-size:17px;margin-top:6px;line-height:1.3;}
  .p-card .desc{font-size:13.5px;color:var(--text-soft);margin-top:8px;line-height:1.5;}
  .p-card .actions{margin-top:14px;display:flex;gap:8px;}
  .mini-btn{flex:1;display:flex;align-items:center;justify-content:center;gap:6px;padding:9px 8px;border-radius:10px;font-size:12.5px;font-weight:700;border:1px solid transparent;}
  .mini-btn.call{background:linear-gradient(180deg,var(--red-bright),var(--red-deep));color:#FFF6E9;}
  .mini-btn.zalo{background:linear-gradient(180deg,var(--zalo-light),var(--zalo));color:#fff;}

  /* ---------- Science / trust ---------- */
  .science{background:var(--ivory-2);}
  .science-grid{display:grid;grid-template-columns:1fr 1fr;gap:44px;align-items:center;}
  @media(max-width:860px){.science-grid{grid-template-columns:1fr;}}
  .science-list{display:grid;gap:20px;}
  .science-item{display:flex;gap:16px;padding-bottom:20px;border-bottom:1px solid var(--cream-dark);}
  .science-item:last-child{border-bottom:none;padding-bottom:0;}
  .science-icon{flex:none;width:44px;height:44px;border-radius:12px;background:#fff;border:1px solid var(--cream-dark);display:flex;align-items:center;justify-content:center;color:var(--red-bright);font-size:18px;}
  .science-item h4{font-family:'Fraunces',serif;font-size:17px;font-weight:600;margin:0 0 4px;color:var(--text-dark);}
  .science-item p{margin:0;font-size:14px;color:var(--text-soft);line-height:1.55;}
  .science-photo{border-radius:20px;padding:10px;background:linear-gradient(160deg,rgba(232,199,102,0.55),rgba(179,36,42,0.12));box-shadow:var(--shadow);}
  .science-photo .inner{border-radius:14px;overflow:hidden;border:1px solid var(--cream-dark);}
  .science-photo img{width:100%;object-fit:cover;aspect-ratio:5/4;}
  .cert-row{display:flex;gap:14px;margin-top:28px;flex-wrap:wrap;}
  .cert-pill{display:flex;align-items:center;gap:8px;background:#fff;border:1px solid var(--cream-dark);border-radius:999px;padding:8px 14px;font-size:12.5px;font-weight:700;color:var(--red-bright);}

  /* ---------- How to buy ---------- */
  .buy{background:var(--ivory);}
  .buy-grid{display:grid;grid-template-columns:1fr 1fr;gap:22px;}
  @media(max-width:760px){.buy-grid{grid-template-columns:1fr;}}
  .buy-card{background:#fff;border-radius:var(--radius);padding:28px 26px;border:1px solid var(--cream-dark);position:relative;}
  .buy-card .step{font-family:'Fraunces',serif;font-size:34px;color:var(--red-bright);font-weight:600;line-height:1;}
  .buy-card h3{font-size:18px;margin:14px 0 8px;}
  .buy-card p{font-size:14.5px;color:var(--text-soft);line-height:1.6;margin:0;}
  .buy-card .addr{margin-top:14px;font-size:13.5px;font-weight:600;color:var(--text-dark);padding:10px 14px;background:var(--ivory-2);border-radius:10px;border:1px dashed var(--red-line);}
  .buy-note{grid-column:1/-1;background:linear-gradient(135deg,var(--red-bright),var(--red-deep));color:#FFF6E9;border-radius:var(--radius);padding:24px 26px;display:flex;gap:16px;align-items:center;flex-wrap:wrap;justify-content:space-between;}
  .buy-note p{margin:0;font-size:14.5px;color:#FCEADC;max-width:520px;}
  .buy-note strong{color:var(--gold-light);}

  /* ---------- Contact ---------- */
  .contact{background:var(--ivory-2);}
  .contact-grid{display:grid;grid-template-columns:1.1fr 0.9fr;gap:24px;align-items:stretch;}
  @media(max-width:860px){.contact-grid{grid-template-columns:1fr;}}
  .map-wrap,.fb-wrap{border-radius:var(--radius);overflow:hidden;border:1px solid var(--cream-dark);box-shadow:var(--shadow);background:#fff;}
  .map-wrap iframe{width:100%;height:100%;min-height:340px;border:0;display:block;}
  .fb-wrap iframe{width:100%;min-height:340px;border:0;display:block;}
  .contact-card{background:#fff;color:var(--text-dark);border-radius:var(--radius);padding:28px;margin-bottom:20px;border:1px solid var(--cream-dark);box-shadow:var(--shadow);}
  .contact-card h3{font-size:19px;margin-bottom:10px;color:var(--text-dark);}
  .contact-card p{font-size:14.5px;color:var(--text-soft);line-height:1.65;margin:0 0 18px;}
  .contact-row{display:flex;align-items:center;gap:12px;font-size:15px;font-weight:700;margin-bottom:12px;}
  .contact-row .ic{width:36px;height:36px;border-radius:10px;background:var(--ivory-2);border:1px solid var(--cream-dark);display:flex;align-items:center;justify-content:center;color:var(--red-bright);flex:none;}
  .contact-row .ic-zalo{background:rgba(0,104,255,0.1);border-color:rgba(0,104,255,0.35);color:var(--zalo);}

  /* ---------- Footer ---------- */
  footer{background:var(--ivory-2);color:var(--text-soft);padding:40px 0 46px;font-size:13px;line-height:1.7;border-top:2px solid var(--gold);}
  footer .container{display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap;}
  footer strong{color:var(--red-deep);}
  footer .col{max-width:420px;}
  footer a{color:var(--red-bright);font-weight:600;}

  /* ---------- Sticky CTA — always visible, desktop + mobile ---------- */
  .sticky-cta{
    position:fixed;
    left:0;right:0;bottom:0;
    z-index:70;
    display:flex;
    gap:10px;
    background:var(--ivory);
    border-top:1px solid var(--cream-dark);
    box-shadow:0 -10px 30px -18px rgba(42,27,20,0.25);
    padding:10px 14px calc(10px + env(safe-area-inset-bottom));
  }
  .sticky-cta a{flex:1;display:flex;align-items:center;justify-content:center;gap:8px;padding:13px;border-radius:12px;font-weight:700;font-size:14.5px;}
  .sticky-cta .call{background:linear-gradient(180deg,var(--red-bright),var(--red-deep));color:#FFF6E9;}
  .sticky-cta .zalo{background:linear-gradient(180deg,var(--zalo-light),var(--zalo));color:#fff;}
  @media(min-width:860px){
    .sticky-cta{
      left:50%;right:auto;bottom:24px;
      transform:translateX(-50%);
      width:auto;
      border-radius:999px;
      border:1px solid var(--cream-dark);
      box-shadow:0 18px 40px -18px rgba(158,27,32,0.35);
      padding:8px;
      gap:8px;
    }
    .sticky-cta a{flex:none;padding:12px 26px;}
  }

  ::selection{background:var(--gold-light);color:#2A1B08;}