/* Layout: one 1120px column; hero = text + "phiếu kiểm nghiệm" card; products as an even grid; certs as document cards.
   Palette: leaf green + jade + rice gold on a green-tinted paper. Display Fraunces, body Be Vietnam Pro. */
:root{
  --paper:#F4F7F0; --card:#FFFFFF; --ink:#18261C; --muted:#56685A; --line:#DAE3D3;
  --leaf:#2E7D3A; --jade:#127A6A; --jade-ink:#FFFFFF; --rice:#B8861F; --rice-soft:#F6ECD3;
  --tint:#E6F0E1; --ok:#1F7A45; --ok-bg:#E2F3E8;
  --f-display:"Fraunces", Georgia, "Times New Roman", serif;
  --f-body:"Be Vietnam Pro", system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
  --r:14px; --wrap:1120px;
}
@media (prefers-color-scheme: dark){
  :root:not([data-theme="light"]){
    --paper:#0F1611; --card:#162019; --ink:#E6EEE4; --muted:#9BAE9E; --line:#26342A;
    --leaf:#6DC07B; --jade:#3FB8A2; --jade-ink:#06231E; --rice:#E3B655; --rice-soft:#2A2414;
    --tint:#1A281E; --ok:#6FD39A; --ok-bg:#13301F; color-scheme:dark;
  }
}
:root[data-theme="dark"]{
  --paper:#0F1611; --card:#162019; --ink:#E6EEE4; --muted:#9BAE9E; --line:#26342A;
  --leaf:#6DC07B; --jade:#3FB8A2; --jade-ink:#06231E; --rice:#E3B655; --rice-soft:#2A2414;
  --tint:#1A281E; --ok:#6FD39A; --ok-bg:#13301F; color-scheme:dark;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--paper);color:var(--ink);font:16px/1.65 var(--f-body);}
img,svg{max-width:100%;display:block}
a{color:var(--jade)}
a:focus-visible,button:focus-visible{outline:3px solid var(--rice);outline-offset:2px;border-radius:6px}
h1,h2,h3{font-family:var(--f-display);font-weight:600;line-height:1.18;text-wrap:balance;margin:0;font-optical-sizing:auto}
h1{font-size:clamp(2rem,1.3rem + 3vw,3.3rem);letter-spacing:-.01em}
h2{font-size:clamp(1.5rem,1.2rem + 1.3vw,2.1rem)}
h3{font-size:1.15rem}
p{margin:0}
.wrap{max-width:var(--wrap);margin:0 auto;padding-left:max(16px,env(safe-area-inset-left,0px));padding-right:max(16px,env(safe-area-inset-right,0px))}
.eyebrow{font-size:.78rem;font-weight:600;letter-spacing:.12em;text-transform:uppercase;color:var(--leaf)}
.lead{font-size:1.1rem;color:var(--muted);max-width:60ch}
.muted{color:var(--muted)}
.num{font-variant-numeric:tabular-nums}

/* Header */
body::before{content:"";position:fixed;inset:0 0 auto;height:env(safe-area-inset-top,0px);z-index:30;background:var(--paper)}
.site-head{position:sticky;top:env(safe-area-inset-top,0px);z-index:20;background:color-mix(in srgb,var(--paper) 92%,transparent);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
.site-head .wrap{display:flex;align-items:center;gap:16px;min-height:68px}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--ink)}
.brand b{font-family:var(--f-display);font-size:1.35rem;font-weight:700;letter-spacing:.01em;display:block;line-height:1}
.brand small{display:block;font-size:.68rem;letter-spacing:.14em;text-transform:uppercase;color:var(--rice);font-weight:600;margin-top:3px}
.nav{margin-left:auto;display:flex;gap:4px}
.nav a{color:var(--ink);text-decoration:none;font-weight:500;padding:8px 12px;border-radius:999px}
.nav a:hover,.nav a[aria-current="page"]{background:var(--tint);color:var(--leaf)}
.head-call{display:inline-flex;align-items:center;gap:8px;background:var(--jade);color:var(--jade-ink);text-decoration:none;font-weight:600;padding:9px 16px;border-radius:999px;white-space:nowrap}
.menu-btn{display:none;margin-left:auto;background:none;border:1px solid var(--line);color:var(--ink);border-radius:10px;padding:8px 12px;font:inherit;font-weight:600}
@media (max-width:860px){
  .head-call{display:none}
  .menu-btn{display:inline-block}
  .nav{display:none;position:absolute;left:0;right:0;top:100%;flex-direction:column;background:var(--paper);border-bottom:1px solid var(--line);padding:8px max(16px,env(safe-area-inset-right,0px)) 16px max(16px,env(safe-area-inset-left,0px))}
  .nav.open{display:flex}
  .nav a{padding:12px}
}

/* Buttons */
.btns{display:flex;flex-wrap:wrap;gap:12px}
.btn{display:inline-flex;align-items:center;gap:8px;padding:12px 20px;border-radius:999px;font-weight:600;text-decoration:none;border:1.5px solid transparent;font-size:1rem}
.btn-primary{background:var(--jade);color:var(--jade-ink)}
.btn-ghost{border-color:var(--line);color:var(--ink);background:var(--card)}
.btn:hover{filter:brightness(1.05)}

/* Sections */
section{padding-block:clamp(48px,7vw,88px)}
.sec-head{display:grid;gap:10px;margin-bottom:32px;max-width:720px}

/* Hero */
.hero{padding-block:clamp(36px,6vw,72px) clamp(40px,6vw,72px)}
.hero .wrap{display:grid;grid-template-columns:1.15fr .85fr;gap:clamp(28px,5vw,64px);align-items:center}
.hero-copy{display:grid;gap:22px;min-width:0}
.hero h1 em{font-style:italic;color:var(--leaf)}
@media (max-width:860px){.hero .wrap{grid-template-columns:1fr}}

/* Lab slip — the signature element */
.slip{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:22px 22px 18px;box-shadow:0 18px 40px -24px rgba(20,60,30,.35);position:relative;min-width:0}
.slip::after{content:"";position:absolute;left:18px;right:18px;top:-7px;height:14px;background:radial-gradient(circle at 7px 7px,var(--paper) 5px,transparent 5.5px) 0 0/18px 14px repeat-x}
.slip-top{display:flex;justify-content:space-between;align-items:baseline;gap:12px;border-bottom:1px dashed var(--line);padding-bottom:12px;margin-bottom:6px}
.slip-top b{font-family:var(--f-display);font-size:1.1rem}
.slip-top span{font-size:.75rem;color:var(--muted);letter-spacing:.08em;text-transform:uppercase}
.slip table{width:100%;border-collapse:collapse;font-size:.92rem}
.slip td{padding:8px 0;border-bottom:1px solid var(--line)}
.slip td:nth-child(2){color:var(--muted);font-variant-numeric:tabular-nums}
.slip td:last-child{text-align:right}
.kph{display:inline-block;background:var(--ok-bg);color:var(--ok);font-weight:700;font-size:.74rem;letter-spacing:.06em;padding:3px 8px;border-radius:999px}
.slip-foot{font-size:.78rem;color:var(--muted);margin-top:12px}

/* Cert strip */
.strip{border-block:1px solid var(--line);background:var(--card);padding-block:22px}
.strip .wrap{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.strip div{display:grid;gap:2px;min-width:0}
.strip b{font-family:var(--f-display);font-size:1.05rem}
.strip span{font-size:.85rem;color:var(--muted)}
@media (max-width:860px){.strip .wrap{grid-template-columns:repeat(2,1fr)}}

/* Product grid */
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(min(100%,160px),1fr));gap:clamp(12px,2vw,18px)}
@media (min-width:700px){.grid{grid-template-columns:repeat(auto-fill,minmax(210px,1fr))}}
.p-card{display:grid;grid-template-rows:auto 1fr;background:var(--card);border:1px solid var(--line);border-radius:var(--r);overflow:hidden;text-decoration:none;color:var(--ink);transition:transform .15s ease,box-shadow .15s ease}
.p-card:hover{transform:translateY(-3px);box-shadow:0 14px 30px -20px rgba(20,60,30,.45)}
.p-img{aspect-ratio:4/3;background:var(--tint);display:grid;place-items:center;max-width:100%}
.p-img svg{width:62%;height:auto}
.p-img img{width:100%;height:100%;object-fit:cover}
.p-body{padding:14px 16px 16px;display:grid;gap:6px;align-content:start}
.p-body p{font-size:.9rem;color:var(--muted)}
.p-tag{font-size:.75rem;font-weight:600;color:var(--ok);display:flex;align-items:center;gap:6px}
.filters{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:22px}
.filters button{font:inherit;font-weight:600;border:1px solid var(--line);background:var(--card);color:var(--ink);padding:8px 16px;border-radius:999px;cursor:pointer}
.filters button[aria-pressed="true"]{background:var(--leaf);border-color:var(--leaf);color:var(--paper)}

/* Process */
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;counter-reset:s;list-style:none;padding:0;margin:0}
.steps li{counter-increment:s;display:grid;gap:8px;padding-top:16px;border-top:2px solid var(--leaf);min-width:0}
.steps li::before{content:"Bước " counter(s);font-size:.75rem;font-weight:700;letter-spacing:.1em;text-transform:uppercase;color:var(--rice)}
.steps p{font-size:.93rem;color:var(--muted)}
@media (max-width:860px){.steps{grid-template-columns:1fr 1fr}}
@media (max-width:520px){.steps{grid-template-columns:1fr}}

/* Band */
.band{background:var(--leaf);color:var(--paper)}
.band .wrap{display:flex;flex-wrap:wrap;gap:24px;align-items:center;justify-content:space-between}
.band h2{color:var(--paper)}
.band p{opacity:.88;max-width:56ch}
.band .btn-primary{background:var(--paper);color:var(--leaf)}

/* Certificates */
.cert-group{display:grid;gap:16px;margin-bottom:40px}
.cert-group>h2{font-size:1.35rem}
.certs{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:18px}
.cert{display:grid;grid-template-columns:120px 1fr;gap:16px;background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:16px;min-width:0}
.cert img{width:120px;height:170px;object-fit:cover;object-position:top;border:1px solid var(--line);border-radius:6px;background:#fff}
.cert-body{display:grid;gap:6px;align-content:start;min-width:0}
.cert dl{margin:0;display:grid;grid-template-columns:auto 1fr;gap:2px 10px;font-size:.86rem}
.cert dt{color:var(--muted)}
.cert dd{margin:0;overflow-wrap:anywhere}
.cert .links{display:flex;gap:14px;flex-wrap:wrap;font-weight:600;font-size:.9rem;margin-top:4px}
@media (max-width:420px){.cert{grid-template-columns:88px 1fr}.cert img{width:88px;height:125px}}
.kn-table{width:100%;border-collapse:collapse;font-size:.92rem;background:var(--card);border:1px solid var(--line);border-radius:var(--r);overflow:hidden}
.kn-table th,.kn-table td{padding:10px 12px;border-bottom:1px solid var(--line);text-align:left}
.kn-table th{font-size:.75rem;letter-spacing:.08em;text-transform:uppercase;color:var(--muted);background:var(--tint)}
.table-scroll{overflow-x:auto}

/* Product page */
.crumbs{font-size:.88rem;color:var(--muted);padding-top:20px}
.crumbs a{color:var(--muted)}
.pd{display:grid;grid-template-columns:1fr 1fr;gap:clamp(24px,5vw,56px);align-items:start;padding-block:24px 48px}
.pd-img{background:var(--tint);border-radius:var(--r);aspect-ratio:1/1;display:grid;place-items:center;max-width:100%;overflow:hidden}
.pd-img svg{width:70%}
.pd-img img{width:100%;height:100%;object-fit:cover}
.pd-info{display:grid;gap:18px;min-width:0}
.specs{display:grid;grid-template-columns:auto 1fr;gap:8px 16px;margin:0;font-size:.95rem}
.specs dt{color:var(--muted)}
.specs dd{margin:0}
@media (max-width:760px){.pd{grid-template-columns:1fr}}
.kn-box{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:20px;display:grid;grid-template-columns:150px 1fr;gap:20px}
.kn-box img{width:150px;border:1px solid var(--line);border-radius:6px;background:#fff}
.kn-box .specs{font-size:.9rem}
@media (max-width:520px){.kn-box{grid-template-columns:1fr}.kn-box img{width:100%;max-width:240px}}
.note{font-size:.82rem;color:var(--muted)}

/* About */
.prose{display:grid;gap:16px;max-width:68ch}
.prose h2{margin-top:16px}
.facts{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:16px}
.fact{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:18px;display:grid;gap:4px}
.fact b{font-family:var(--f-display);font-size:1.2rem}

/* Contact */
.contact{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:18px}
.c-card{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:22px;display:grid;gap:10px;align-content:start}
.c-card .big{font-family:var(--f-display);font-size:1.6rem;font-variant-numeric:tabular-nums;user-select:all}

/* Footer */
.site-foot{border-top:1px solid var(--line);background:var(--card);padding-block:40px calc(40px + env(safe-area-inset-bottom,0px));font-size:.9rem}
.site-foot .wrap{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:28px}
.site-foot h3{font-size:1rem;margin-bottom:8px}
.site-foot ul{list-style:none;margin:0;padding:0;display:grid;gap:6px}
.site-foot a{color:var(--ink);text-decoration:none}
.site-foot a:hover{color:var(--jade)}
.legal{grid-column:1/-1;border-top:1px solid var(--line);padding-top:16px;color:var(--muted);font-size:.8rem}
@media (max-width:760px){.site-foot .wrap{grid-template-columns:1fr}}

/* Mobile action bar */
.action-bar{display:none}
@media (max-width:760px){
  .action-bar{display:grid;grid-template-columns:1fr 1fr;gap:10px;position:fixed;left:0;right:0;bottom:0;z-index:25;background:var(--card);border-top:1px solid var(--line);padding:10px max(16px,env(safe-area-inset-right,0px)) calc(10px + env(safe-area-inset-bottom,0px)) max(16px,env(safe-area-inset-left,0px))}
  .action-bar a{justify-content:center}
  body{padding-bottom:72px}
}
@media (prefers-reduced-motion:reduce){*{transition:none!important;animation:none!important}}