:root{
  --ground:#E9ECE8; --surface:#F6F7F4; --ink:#1B2320; --muted:#5F6B66; --line:#C9D0CB;
  --accent:#2E5B4E; --accent-ink:#F3F6F4; --rust:#9A5F27; --slot:#D8DDD8; --slot-ink:#6E7A74;
  --display:"Archivo","Arial Narrow",Arial,sans-serif;
  --body:"Source Sans 3","Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  --mono:"IBM Plex Mono",ui-monospace,Menlo,Consolas,monospace;
  --wrap:1180px;
}
@media (prefers-color-scheme: dark){
  :root:not([data-theme="light"]){
    --ground:#131816; --surface:#1A211E; --ink:#E5EAE6; --muted:#9AA7A1; --line:#2E3834;
    --accent:#7DB3A1; --accent-ink:#0F1513; --rust:#D39A5E; --slot:#222B27; --slot-ink:#8C9993;
    color-scheme:dark;
  }
}
:root[data-theme="dark"]{
  --ground:#131816; --surface:#1A211E; --ink:#E5EAE6; --muted:#9AA7A1; --line:#2E3834;
  --accent:#7DB3A1; --accent-ink:#0F1513; --rust:#D39A5E; --slot:#222B27; --slot-ink:#8C9993;
  color-scheme:dark;
}
*{box-sizing:border-box}
body{background:var(--ground);color:var(--ink);font-family:var(--body);font-size:17px;line-height:1.55;margin:0}
.wrap{max-width:var(--wrap);margin:0 auto;padding-inline:clamp(16px,4vw,40px)}
h1,h2,h3{font-family:var(--display);font-stretch:118%;letter-spacing:-.01em;line-height:1.05;text-wrap:balance;margin:0}
h1{font-size:clamp(2.3rem,5.6vw,4.4rem);font-weight:800}
h2{font-size:clamp(1.7rem,3.4vw,2.6rem);font-weight:700}
h3{font-size:1.12rem;font-weight:700;font-stretch:112%}
p{margin:0}
a{color:inherit}
.eyebrow.slogan{font-family:var(--display);font-style:italic;font-weight:700;font-stretch:100%;text-transform:none;letter-spacing:.01em;font-size:1.05rem;color:var(--rust)}
.eyebrow{font-family:var(--mono);font-size:.78rem;letter-spacing:.12em;text-transform:uppercase;color:var(--muted)}
.mono{font-family:var(--mono)}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px}
.btn{display:inline-flex;align-items:center;gap:.5em;font-family:var(--display);font-stretch:112%;font-weight:700;font-size:.95rem;padding:.85em 1.3em;border:2px solid var(--ink);color:var(--ink);text-decoration:none;background:transparent;cursor:pointer}
.btn.primary{background:var(--accent);border-color:var(--accent);color:var(--accent-ink)}
.btn:hover{transform:translateY(-1px)}

/* header */
header.top{position:sticky;top:env(safe-area-inset-top,0px);z-index:10;background:color-mix(in srgb,var(--ground) 92%,transparent);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
.top .wrap{display:flex;align-items:center;justify-content:space-between;gap:16px;padding-block:14px}
.brand{display:flex;align-items:center;gap:12px;text-decoration:none}
.mark{width:48px;height:40px;flex:none}
.brand b{font-family:var(--display);font-stretch:125%;font-weight:800;font-size:1rem;letter-spacing:.02em;display:block;line-height:1.1}
.brand small{font-family:var(--mono);font-size:.68rem;color:var(--muted);letter-spacing:.08em}
nav.menu{display:flex;gap:22px;align-items:center;font-weight:600;font-size:.95rem}
nav.menu a{text-decoration:none}
nav.menu a:hover{color:var(--accent)}
@media (max-width:860px){nav.menu a:not(.btn){display:none}}
@media (max-width:520px){.brand small{display:none}.brand b{font-size:.9rem}nav.menu .btn{padding:.6em .9em;font-size:.82rem;white-space:nowrap}}
[hidden]{display:none!important}

/* hero */
.hero{padding-block:clamp(40px,7vw,88px) clamp(32px,5vw,56px)}
.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:clamp(24px,4vw,56px);align-items:end}
.hero p.lede{font-size:1.2rem;color:var(--muted);max-width:34em;margin-top:22px}
.hero .ctas{display:flex;flex-wrap:wrap;gap:12px;margin-top:30px}
@media (max-width:860px){.hero-grid{grid-template-columns:1fr}}

/* photo slots */
.slot{position:relative;background:var(--slot);color:var(--slot-ink);display:flex;flex-direction:column;justify-content:flex-end;padding:14px;overflow:hidden;max-width:100%}
.slot::before{content:"";position:absolute;inset:0;background:repeating-linear-gradient(135deg,transparent 0 14px,color-mix(in srgb,var(--slot-ink) 12%,transparent) 14px 15px)}
.slot span{position:relative;font-family:var(--mono);font-size:.74rem;letter-spacing:.04em;line-height:1.4}
.slot span b{display:block;color:var(--ink);font-weight:500}
.hero .slot{aspect-ratio:4/3.4}

/* facts strip */
.facts{border-block:1px solid var(--line);background:var(--surface)}
.facts dl{display:grid;grid-template-columns:repeat(5,1fr);margin:0}
.facts dl>div{padding:18px 16px;border-left:1px solid var(--line)}
.facts dl>div:first-child{border-left:0;padding-left:0}
.facts dt{font-family:var(--mono);font-size:.7rem;letter-spacing:.1em;text-transform:uppercase;color:var(--muted)}
.facts dd{margin:4px 0 0;font-family:var(--display);font-stretch:112%;font-weight:700;font-size:1.02rem}
@media (max-width:900px){.facts dl{grid-template-columns:repeat(2,1fr)}.facts dl>div{border-left:0;padding-left:0;border-top:1px solid var(--line)}.facts dl>div:nth-child(-n+2){border-top:0}}

section.block{padding-block:clamp(56px,8vw,96px)}
.head{display:grid;grid-template-columns:1fr 1fr;gap:24px 48px;align-items:end;margin-bottom:40px}
.head p{color:var(--muted);max-width:36em}
@media (max-width:760px){.head{grid-template-columns:1fr}}

/* products */
.products{display:grid;grid-template-columns:repeat(3,1fr);gap:1px;background:var(--line);border:1px solid var(--line)}
.prod{background:var(--surface);padding:22px;display:grid;grid-template-rows:auto auto 1fr auto;gap:10px}
.prod svg{width:100%;height:130px;display:block}
.prod p{color:var(--muted);font-size:.98rem}
.prod .spec{font-family:var(--mono);font-size:.76rem;color:var(--muted);border-top:1px dashed var(--line);padding-top:10px}
@media (max-width:900px){.products{grid-template-columns:repeat(2,1fr)}}
@media (max-width:560px){.products{grid-template-columns:1fr}}
.shape-fill{fill:var(--slot)} .shape-line{stroke:var(--ink);stroke-width:1.6;fill:none}
.shape-accent{fill:var(--accent)}

.finishes{margin-top:34px;display:flex;flex-wrap:wrap;gap:10px 18px;align-items:center}
.chip{display:inline-flex;align-items:center;gap:8px;font-size:.92rem}
.chip i{width:18px;height:18px;border:1px solid var(--line);display:inline-block}

/* process */
.process{background:var(--ink);color:var(--ground)}
.process .eyebrow,.process .head p{color:color-mix(in srgb,var(--ground) 65%,var(--ink))}
.steps{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(4,1fr);gap:0;border-top:1px solid color-mix(in srgb,var(--ground) 22%,var(--ink))}
.steps li{padding:22px 20px 26px 0;border-bottom:1px solid color-mix(in srgb,var(--ground) 22%,var(--ink));display:grid;gap:8px;align-content:start}
.steps li+li{padding-left:20px;border-left:1px solid color-mix(in srgb,var(--ground) 22%,var(--ink))}
.steps li:nth-child(4n+1){border-left:0;padding-left:0}
.steps .n{font-family:var(--mono);font-size:.8rem;color:var(--rust)}
.steps p{font-size:.95rem;color:color-mix(in srgb,var(--ground) 78%,var(--ink))}
@media (max-width:900px){.steps{grid-template-columns:repeat(2,1fr)}.steps li:nth-child(4n+1){border-left:1px solid color-mix(in srgb,var(--ground) 22%,var(--ink));padding-left:20px}.steps li:nth-child(2n+1){border-left:0;padding-left:0}}
@media (max-width:520px){.steps{grid-template-columns:1fr}.steps li,.steps li+li{border-left:0!important;padding-left:0!important}}

.faq{border-top:1px solid var(--line)}
.faq details{border-bottom:1px solid var(--line);padding:18px 0}
.faq summary{cursor:pointer;font-weight:600;font-size:1.05rem;list-style:none;display:flex;justify-content:space-between;gap:16px}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";font-family:var(--mono);color:var(--accent)}
.faq details[open] summary::after{content:"–"}
.faq details p{color:var(--muted);margin:10px 0 0;max-width:46em}
.qlist{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(3,1fr);gap:1px;background:var(--line);border:1px solid var(--line)}
.qlist li{background:var(--surface);padding:20px 22px;display:grid;gap:6px;align-content:start}
.qlist .k{font-family:var(--mono);font-size:.74rem;letter-spacing:.06em;text-transform:uppercase;color:var(--rust)}
.qlist h3{font-size:1.05rem;margin:0}
.qlist p{margin:0;color:var(--muted);font-size:.95rem}
@media (max-width:900px){.qlist{grid-template-columns:repeat(2,1fr)}}
@media (max-width:560px){.qlist{grid-template-columns:1fr}}
/* gallery */
.gallery{display:grid;grid-template-columns:repeat(6,1fr);grid-auto-rows:clamp(120px,15vw,190px);gap:10px}
.g1{grid-column:span 3;grid-row:span 2}.g2{grid-column:span 3}.g3{grid-column:span 2}.g4{grid-column:span 1}
.g5{grid-column:span 3}.g6{grid-column:span 3}.g7{grid-column:span 3}.g8{grid-column:span 3}
@media (max-width:760px){.gallery{grid-template-columns:repeat(2,1fr)}.gallery>*{grid-column:span 1!important;grid-row:span 1!important}.g1{grid-column:span 2!important}}

/* spec table */
.spec-grid{display:grid;grid-template-columns:.9fr 1.1fr;gap:48px;align-items:start}
@media (max-width:860px){.spec-grid{grid-template-columns:1fr}}
.tbl{overflow-x:auto;border:1px solid var(--line);background:var(--surface)}
table{border-collapse:collapse;width:100%;min-width:440px;font-size:.95rem}
th,td{text-align:left;padding:12px 16px;border-bottom:1px solid var(--line);vertical-align:top}
th{font-family:var(--mono);font-weight:500;font-size:.74rem;letter-spacing:.08em;text-transform:uppercase;color:var(--muted);width:36%}
tr:last-child th,tr:last-child td{border-bottom:0}
td.mono{font-size:.9rem}

/* order flow */
.flow{display:grid;grid-template-columns:repeat(5,1fr);gap:14px;counter-reset:f}
.flow div{border-top:3px solid var(--accent);padding-top:14px;display:grid;gap:6px}
.flow .n{font-family:var(--mono);font-size:.78rem;color:var(--muted)}
.flow p{font-size:.95rem;color:var(--muted)}
@media (max-width:900px){.flow{grid-template-columns:repeat(2,1fr)}}
@media (max-width:520px){.flow{grid-template-columns:1fr}}
.docs{margin-top:28px;display:flex;flex-wrap:wrap;gap:8px}
.docs span{font-family:var(--mono);font-size:.78rem;border:1px solid var(--line);padding:5px 10px;background:var(--surface)}

/* contact */
.contact{background:var(--surface);border-top:1px solid var(--line)}
.contact-grid{display:grid;grid-template-columns:.85fr 1.15fr;gap:48px}
@media (max-width:860px){.contact-grid{grid-template-columns:1fr}}
.card-info{display:grid;gap:18px;margin-top:26px}
.card-info div{display:grid;gap:2px}
.card-info .k{font-family:var(--mono);font-size:.72rem;letter-spacing:.1em;text-transform:uppercase;color:var(--muted)}
.card-info .v{font-weight:600;user-select:all}
form{display:grid;grid-template-columns:1fr 1fr;gap:14px}
form .full{grid-column:1/-1}
label{display:grid;gap:6px;font-size:.88rem;font-weight:600}
input,select,textarea{font:inherit;font-weight:400;font-size:1rem;color:var(--ink);background:var(--ground);border:1px solid var(--line);padding:11px 12px;width:100%}
textarea{min-height:110px;resize:vertical}
@media (max-width:560px){form{grid-template-columns:1fr}}
.out{grid-column:1/-1;border:1px solid var(--accent);background:var(--ground);padding:16px;display:grid;gap:10px}
.out pre{margin:0;white-space:pre-wrap;font-family:var(--mono);font-size:.84rem;user-select:all}
.out .row{display:flex;flex-wrap:wrap;gap:10px;align-items:center}
.small{font-size:.86rem;color:var(--muted)}

footer{border-top:1px solid var(--line);padding-block:26px;font-size:.88rem;color:var(--muted)}
footer .wrap{display:flex;flex-wrap:wrap;justify-content:space-between;gap:12px}
@media (prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto!important}}
html{scroll-behavior:smooth}
section[id]{scroll-margin-top:80px}
/* ảnh thật tự phủ lên ô trống khi có file trong thư mục images/ */
.slot img,.prod .photo img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;display:block}
.slot.empty{display:none}
.hero-grid:has(.slot.empty){grid-template-columns:1fr}.hero-grid:has(.slot.empty)>div:first-child{max-width:760px}
.gallery:has(.slot.empty){grid-template-columns:repeat(3,1fr)}.gallery:has(.slot.empty)>.slot{grid-column:auto!important;grid-row:auto!important}
.gallery:not(:has(.slot:not(.empty))){display:none}
@media (max-width:760px){.gallery:has(.slot.empty){grid-template-columns:repeat(2,1fr)}}
.slot.has-img::before,.slot.has-img span{display:none}
.prod .photo{position:relative;height:130px;overflow:hidden}
.prod .photo.has-img svg{visibility:hidden}
.send{display:flex;flex-wrap:wrap;gap:10px}