/* Bigstone Vina — site styles */
:root{
  --bg:#F3F4F7;
  --surface:#FFFFFF;
  --sunken:#E9EBF0;
  --ink:#141833;
  --muted:#555A70;
  --faint:#888CA0;
  --line:#D8DBE4;
  --line-soft:#E6E8EE;
  --navy:#1D2087;
  --accent:#1D2087;
  --magenta:#A2165F;
  --accent-hover:#151864;
  --dark:#13164F;
  --on-dark:#FFFFFF;
  --on-dark-muted:#C9CBE4;
  --on-dark-label:#9EA1C8;
  --radius:12px;
  --wrap:1280px;
  --gutter:clamp(16px,5vw,80px);
  --sans:"IBM Plex Sans KR","Apple SD Gothic Neo","Malgun Gothic",sans-serif;
  --mono:"IBM Plex Mono",ui-monospace,Menlo,Consolas,monospace;
  color-scheme:light;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none!important}}
body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--sans);font-size:16px;line-height:1.6;word-break:keep-all;overflow-wrap:break-word}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
a:hover{color:var(--accent)}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:4px}
h1,h2,h3{margin:0;text-wrap:balance;letter-spacing:-0.01em}
p{margin:0}
.wrap{width:100%;max-width:calc(var(--wrap) + var(--gutter)*2);margin:0 auto;padding-inline:var(--gutter)}
.skip{position:absolute;left:-999px}
.skip:focus{left:16px;top:16px;background:var(--surface);padding:8px 12px;z-index:100}

/* Buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:48px;padding:0 24px;border-radius:8px;font-weight:600;font-size:15px;border:1px solid transparent;cursor:pointer;font-family:inherit;transition:background .15s,color .15s,border-color .15s}
.btn-primary{background:var(--accent);color:#fff}
.btn-primary:hover{background:var(--accent-hover);color:#fff}
.btn-line{border-color:var(--ink);color:var(--ink);background:transparent}
.btn-line:hover{background:var(--ink);color:#fff}
.btn-sm{min-height:44px;padding:0 20px;font-size:14px}

/* Header */
.site-header{position:sticky;top:env(safe-area-inset-top,0px);z-index:50;background:var(--surface);border-bottom:1px solid var(--line)}
.header-inner{display:flex;align-items:center;justify-content:space-between;gap:24px;height:76px}
.brand{display:flex;align-items:center;gap:12px}
.brand-logo{height:44px;width:auto;flex-shrink:0}
.brand-mark{width:36px;height:36px;border-radius:8px;background:var(--navy);color:#fff;display:grid;place-items:center;font-weight:700;font-size:14px;letter-spacing:.02em}
.brand-text{display:flex;flex-direction:column;line-height:1.15}
.brand-text b{font-size:17px;letter-spacing:.03em}
.brand-text span{font-size:12px;color:var(--muted)}
.nav{display:flex;align-items:center;gap:36px;font-size:15px;font-weight:500}
.nav a[aria-current="page"]{color:var(--magenta)}
.header-cta{display:flex;align-items:center;gap:12px}
.menu-btn{display:none;width:44px;height:44px;border:0;background:transparent;color:var(--ink);cursor:pointer;padding:0;align-items:center;justify-content:center}
@media (max-width:900px){
  .header-inner{height:64px}
  .menu-btn{display:inline-flex}
  .header-cta .btn{display:none}
  .nav{position:absolute;top:100%;left:0;right:0;background:var(--surface);border-bottom:1px solid var(--line);flex-direction:column;align-items:stretch;gap:0;padding:8px var(--gutter) 16px;display:none}
  .nav.open{display:flex}
  .nav a{padding:14px 0;border-bottom:1px solid var(--line-soft)}
  .nav .btn{display:flex;margin-top:12px;border-bottom:0}
}
@media (min-width:901px){.nav .nav-cta{display:none}}

/* Section heads */
.section{padding-block:clamp(72px,9vw,120px) 0}
.eyebrow{font-family:var(--mono);font-size:13px;letter-spacing:.08em;color:var(--magenta);text-transform:uppercase}
.sec-head{display:flex;justify-content:space-between;align-items:flex-end;gap:24px;flex-wrap:wrap;margin-bottom:40px}
.sec-head .titles{display:flex;flex-direction:column;gap:10px}
.sec-head h2{font-size:clamp(28px,3.2vw,36px);font-weight:700}
.sec-head p{color:var(--muted);max-width:440px}
.more{display:inline-flex;align-items:center;gap:6px;font-weight:600;font-size:15px;min-height:44px}

/* Hero */
.hero{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:64px;align-items:center;padding-block:clamp(48px,7vw,88px) clamp(40px,5vw,72px)}
.hero-copy{display:flex;flex-direction:column;gap:26px}
.hero h1{font-size:clamp(34px,4.4vw,54px);line-height:1.22;font-weight:700;letter-spacing:-0.02em}
.hero .lead{font-size:clamp(16px,1.4vw,18px);color:var(--muted);max-width:34em;line-height:1.75}
.hero-actions{display:flex;gap:12px;flex-wrap:wrap}
.hero-media{display:flex;flex-direction:column;gap:12px}
.hero-media .photo{aspect-ratio:4/3.2;border-radius:16px;background:var(--surface);border:1px solid var(--line)}
.hero-caption{display:flex;justify-content:space-between;gap:12px;font-size:14px;color:var(--muted);flex-wrap:wrap}
.hero-caption b{color:var(--ink);font-weight:600}
@media (max-width:900px){.hero{grid-template-columns:minmax(0,1fr);gap:32px}}

/* Photo slot: shows the image when present, else a labelled placeholder */
.photo{position:relative;overflow:hidden;background:var(--sunken);display:grid;place-items:center;color:var(--faint);font-size:13px;text-align:center;max-width:100%}
.photo .ph{display:flex;flex-direction:column;align-items:center;gap:8px;padding:12px}
.photo img{position:absolute;inset:0;width:100%;height:100%;object-fit:contain;background:var(--surface)}

/* Facts */
.facts{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:24px;padding:28px 36px;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius)}
.fact{display:flex;flex-direction:column;gap:4px}
.fact span{font-size:13px;color:var(--muted)}
.fact b{font-size:18px;font-weight:600}
@media (max-width:900px){.facts{grid-template-columns:repeat(2,minmax(0,1fr));padding:24px}}
@media (max-width:480px){.facts{grid-template-columns:minmax(0,1fr)}}

/* Business cards */
.biz-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:20px}
.biz{display:flex;flex-direction:column;gap:14px;padding:30px 26px;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);transition:border-color .15s}
.biz:hover{border-color:var(--ink);color:var(--ink)}
.biz .code{font-family:var(--mono);font-size:12px;color:var(--muted);letter-spacing:.06em}
.biz h3{font-size:22px}
.biz p{font-size:15px;color:var(--muted);flex-grow:1}
.biz .ex{font-size:13px;border-top:1px solid var(--line-soft);padding-top:14px;line-height:1.6}
.biz .go{font-size:14px;font-weight:600;color:var(--accent)}
@media (max-width:1100px){.biz-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media (max-width:560px){.biz-grid{grid-template-columns:minmax(0,1fr)}}

/* Product cards */
.prod-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:20px}
.prod{display:flex;flex-direction:column;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;transition:border-color .15s}
.prod:hover{border-color:var(--ink);color:var(--ink)}
.prod .photo{aspect-ratio:4/3}
.prod-body{display:flex;flex-direction:column;gap:12px;padding:22px;flex-grow:1}
.prod .cat{font-size:12px;font-weight:600;color:var(--magenta);letter-spacing:.04em}
.prod h3{font-size:18px;line-height:1.35}
.prod .ko{font-size:14px;color:var(--muted);margin-top:-6px}
.spec{display:grid;grid-template-columns:44px minmax(0,1fr);row-gap:4px;column-gap:8px;font-size:13px;border-top:1px solid var(--line-soft);padding-top:12px;margin-top:auto}
.spec dt{color:var(--muted)}
.spec dd{margin:0;font-family:var(--mono);font-variant-numeric:tabular-nums}
@media (max-width:1100px){.prod-grid{grid-template-columns:repeat(3,minmax(0,1fr))}}
@media (max-width:820px){.prod-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media (max-width:480px){.prod-grid{grid-template-columns:minmax(0,1fr)}}

/* Process */
.steps{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));border-top:2px solid var(--ink);list-style:none;margin:0;padding:0}
.steps li{padding:22px 24px 0 0;display:flex;flex-direction:column;gap:8px}
.steps .n{font-family:var(--mono);font-size:13px;color:var(--magenta)}
.steps b{font-size:19px}
.steps p{font-size:14px;color:var(--muted)}
@media (max-width:900px){
  .steps{grid-template-columns:minmax(0,1fr);border-top:0;border-left:2px solid var(--ink)}
  .steps li{padding:0 0 22px 20px}
}

/* Clients */
.clients{display:grid;grid-template-columns:repeat(7,minmax(0,1fr));border-top:1px solid var(--line);border-left:1px solid var(--line)}
.clients div{min-height:100px;display:grid;place-items:center;border-right:1px solid var(--line);border-bottom:1px solid var(--line);background:var(--surface);font-weight:700;letter-spacing:.05em;color:#6A6F85;font-size:15px;padding:8px;text-align:center}

.clients img{display:block;max-width:100%;max-height:44px;width:auto;height:auto;object-fit:contain}
@media (max-width:1000px){.clients{grid-template-columns:repeat(4,minmax(0,1fr))}}
@media (max-width:560px){.clients{grid-template-columns:repeat(2,minmax(0,1fr))}.clients div{min-height:72px;font-size:14px}}

/* CTA band */
.cta{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:56px;padding:clamp(32px,5vw,64px);border-radius:16px;background:var(--dark);color:var(--on-dark)}
.cta h2{font-size:clamp(26px,3vw,36px);line-height:1.35}
.cta p{color:var(--on-dark-muted);margin-top:16px}
.cta .btn{margin-top:28px}
.cta dl{display:grid;grid-template-columns:88px minmax(0,1fr);row-gap:16px;margin:0;align-content:center}
.cta dt{color:var(--on-dark-label)}
.cta dd{margin:0}
.cta a:hover{color:#F2A9CB}
@media (max-width:900px){.cta{grid-template-columns:minmax(0,1fr);gap:32px}}

/* Footer */
.site-footer{margin-top:clamp(72px,8vw,112px);background:var(--surface);border-top:1px solid var(--line);font-size:13px;color:var(--muted)}
.footer-inner{display:flex;justify-content:space-between;gap:32px;flex-wrap:wrap;padding-block:40px}
.footer-inner .col{display:flex;flex-direction:column;gap:6px}
.footer-inner b{font-size:15px;color:var(--ink)}
.footer-links{display:flex;gap:20px;flex-wrap:wrap}
.footer-links a{min-height:32px;display:inline-flex;align-items:center}

/* Sub pages */
.page-head{padding-block:clamp(48px,6vw,80px) clamp(32px,4vw,48px);border-bottom:1px solid var(--line)}
.page-head h1{font-size:clamp(32px,4vw,46px);font-weight:700;margin-top:12px}
.page-head p{color:var(--muted);margin-top:14px;max-width:40em;font-size:17px}
.crumbs{font-size:13px;color:var(--muted);display:flex;gap:8px;flex-wrap:wrap}
.crumbs a{text-decoration:underline;text-underline-offset:3px}

/* About */
.two-col{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.4fr);gap:64px}
@media (max-width:900px){.two-col{grid-template-columns:minmax(0,1fr);gap:24px}}
.overview{display:grid;grid-template-columns:140px minmax(0,1fr);margin:0;border-top:2px solid var(--ink)}
.overview dt,.overview dd{padding:16px 0;border-bottom:1px solid var(--line)}
.overview dt{color:var(--muted);font-size:15px}
.overview dd{margin:0}
@media (max-width:560px){.overview{grid-template-columns:minmax(0,1fr)}.overview dt{border-bottom:0;padding-bottom:0}.overview dd{padding-top:4px}}
.cap-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:20px}
.cap{padding:26px;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);display:flex;flex-direction:column;gap:12px}
.cap h3{font-size:19px}
.cap ul{margin:0;padding-left:18px;color:var(--muted);font-size:14px;display:flex;flex-direction:column;gap:4px}
@media (max-width:1000px){.cap-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media (max-width:560px){.cap-grid{grid-template-columns:minmax(0,1fr)}}
.map-card{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:24px;align-items:center;padding:28px 32px;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius)}
.map-card .addr{display:flex;flex-direction:column;gap:6px}
.map-card .addr b{font-size:18px}
.map-card .addr span{color:var(--muted)}
@media (max-width:700px){.map-card{grid-template-columns:minmax(0,1fr)}}
.todo{display:inline-block;padding:1px 8px;border-radius:4px;background:#F7E3EC;color:#8A1350;font-size:.9em}

/* Product list page */
.filters{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:32px}
.chip{min-height:44px;padding:0 18px;border-radius:999px;border:1px solid var(--line);background:var(--surface);font:inherit;font-size:14px;font-weight:600;color:var(--ink);cursor:pointer}
.chip:hover{border-color:var(--ink)}
.chip[aria-pressed="true"]{background:var(--ink);border-color:var(--ink);color:#fff}
.chip .cnt{font-family:var(--mono);font-weight:500;opacity:.7;margin-left:4px}
.cat-block{display:flex;flex-direction:column;gap:20px;padding-top:40px}
.cat-block:first-of-type{padding-top:0}
.cat-block h2{font-size:24px;display:flex;align-items:baseline;gap:12px}
.cat-block h2 small{font-size:14px;font-weight:400;color:var(--muted)}

/* Product detail */
.detail{display:grid;grid-template-columns:minmax(0,1.1fr) minmax(0,1fr);gap:56px;align-items:start;padding-block:40px 0}
.detail .photo{aspect-ratio:4/3;border-radius:16px;border:1px solid var(--line);background:var(--surface)}
.detail-info{display:flex;flex-direction:column;gap:20px}
.detail-info h1{font-size:clamp(28px,3.4vw,40px);line-height:1.2}
.detail-info .ko{font-size:18px;color:var(--muted);margin-top:-8px}
.detail-info .desc{font-size:16px;line-height:1.8}
.spec-table{width:100%;border-collapse:collapse;border-top:2px solid var(--ink);font-size:15px}
.spec-table th,.spec-table td{text-align:left;padding:14px 0;border-bottom:1px solid var(--line);vertical-align:top}
.spec-table th{width:110px;color:var(--muted);font-weight:500}
.spec-table td{font-family:var(--mono);font-variant-numeric:tabular-nums}
.spec-table td.txt{font-family:var(--sans)}
.detail-actions{display:flex;gap:12px;flex-wrap:wrap}
@media (max-width:900px){.detail{grid-template-columns:minmax(0,1fr);gap:28px;padding-block:24px 0}}

/* Contact */
.contact-grid{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.5fr);gap:56px;align-items:start}
@media (max-width:900px){.contact-grid{grid-template-columns:minmax(0,1fr);gap:32px}}
.info-list{display:flex;flex-direction:column;border-top:2px solid var(--ink)}
.info-item{display:flex;flex-direction:column;gap:4px;padding:18px 0;border-bottom:1px solid var(--line)}
.info-item span{font-size:13px;color:var(--muted)}
.info-item .val{display:flex;align-items:center;gap:10px;flex-wrap:wrap;font-size:17px;font-weight:500}
.copy{min-height:32px;padding:0 12px;border-radius:6px;border:1px solid var(--line);background:var(--surface);font:inherit;font-size:13px;cursor:pointer;color:var(--ink)}
.copy:hover{border-color:var(--ink)}
.form{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px 20px;padding:clamp(24px,3vw,36px);background:var(--surface);border:1px solid var(--line);border-radius:var(--radius)}
.form h2{grid-column:1/-1;font-size:22px}
.form .full{grid-column:1/-1}
.field{display:flex;flex-direction:column;gap:6px}
.field label{font-size:14px;font-weight:600}
.field label em{color:var(--magenta);font-style:normal;margin-left:2px}
.field input,.field select,.field textarea{font:inherit;font-size:15px;color:var(--ink);background:var(--bg);border:1px solid var(--line);border-radius:8px;padding:12px 14px;min-height:48px;width:100%}
.field textarea{min-height:150px;resize:vertical}
.field input:focus,.field select:focus,.field textarea:focus{outline:2px solid var(--accent);outline-offset:0;border-color:transparent}
.form .hint{font-size:13px;color:var(--muted)}
.form .btn{justify-self:start}
@media (max-width:600px){.form{grid-template-columns:minmax(0,1fr)}}
.result{grid-column:1/-1;display:flex;flex-direction:column;gap:12px;padding:20px;border-radius:10px;background:var(--bg);border:1px solid var(--line)}
.result pre{margin:0;white-space:pre-wrap;font-family:var(--sans);font-size:14px;line-height:1.7;max-height:260px;overflow:auto}
.result .row{display:flex;gap:10px;flex-wrap:wrap;align-items:center}
.result .note{font-size:13px;color:var(--muted)}
.error{font-size:13px;color:#A12A1A}

/* Language-specific type */
html[lang="en"],html[lang="vi"]{--sans:"IBM Plex Sans","Segoe UI",Roboto,sans-serif}
html[lang="zh-Hans"]{--sans:"Noto Sans SC","PingFang SC","Microsoft YaHei",sans-serif}
html[lang="en"] body,html[lang="vi"] body,html[lang="zh-Hans"] body{word-break:normal}
.brand-text b{white-space:nowrap}
@media (max-width:480px){.brand-text b{font-size:15px}.brand{gap:8px}}

/* Language switcher */
.langs{display:flex;align-items:center;gap:2px;color:var(--muted);font-size:13px;font-weight:600}
.langs svg{margin-right:4px}
.langs a{min-height:36px;min-width:32px;padding:0 6px;display:inline-flex;align-items:center;justify-content:center;border-radius:6px;color:var(--muted)}
.langs a:hover{color:var(--ink);background:var(--bg)}
.langs a[aria-current="page"]{color:var(--ink);background:var(--bg)}
@media (max-width:1100px){.nav{gap:24px}}
@media (max-width:480px){.langs svg{display:none}.langs a{min-width:28px;padding:0 4px;font-size:12px}.brand-text span{display:none}}

.spec dd.txt{font-family:var(--sans)}
.overview .sub{color:var(--muted);font-size:14px}
.info-item .val.small{font-size:15px;font-weight:400}

/* CTA band: magenta hairline from the logo */
.cta{position:relative;overflow:hidden}
.cta::before{content:"";position:absolute;left:0;top:0;bottom:0;width:6px;background:var(--magenta)}
@media (max-width:900px){.brand-logo{height:36px}}
.cta .btn-primary{background:var(--magenta)}
.cta .btn-primary:hover{background:#86104E;color:#fff}