/* Quality Japan Design – 青図 (mẫu C, chốt 13/11/2026) */
:root{
  --bg:#0B1628;
  --bg-deep:#070F1D;
  --panel:rgba(11,22,40,0.97);
  --line:#2A3E5C;
  --line-2:#4A6488;
  --text:#F4F7FB;
  --muted:#C9D5E3;
  --accent:#9AD6F0;
  --warn:#F2B35B;
  --max:1240px;
  --sans:'IBM Plex Sans JP',system-ui,sans-serif;
  --mono:'IBM Plex Mono',ui-monospace,monospace;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:88px}
body{
  margin:0;font-family:var(--sans);color:var(--text);font-size:17px;line-height:1.85;
  background-color:var(--bg);
  background-image:linear-gradient(rgba(154,214,240,0.035) 1px,transparent 1px),linear-gradient(90deg,rgba(154,214,240,0.035) 1px,transparent 1px);
  background-size:40px 40px;
  -webkit-font-smoothing:antialiased;
}
a{color:var(--accent)}
a:hover{color:var(--text)}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px}
img,svg{max-width:100%}
.mono{font-family:var(--mono)}
.muted{color:var(--muted)}
.wrap{max-width:var(--max);margin:0 auto;padding-inline:28px}
.skip{position:absolute;left:-9999px;top:0;background:var(--accent);color:var(--bg);padding:8px 16px;z-index:100}
.skip:focus{left:16px;top:16px}

/* Header */
.site-header{position:sticky;top:0;z-index:50;background:rgba(11,22,40,0.97);backdrop-filter:blur(6px);border-bottom:1px solid var(--line)}
.site-header .wrap{display:flex;flex-wrap:wrap;justify-content:space-between;align-items:center;gap:16px;padding-block:16px}
.brand{display:flex;align-items:baseline;gap:12px;text-decoration:none;color:var(--text)}
.brand-mark{font-family:var(--mono);font-size:20px;font-weight:500;letter-spacing:.08em}
.brand-name{font-size:14px;color:var(--muted);letter-spacing:.1em}
.nav{display:flex;flex-wrap:wrap;gap:8px 28px;align-items:center;font-family:var(--mono);font-size:14px;letter-spacing:.06em}
.nav a{text-decoration:none;color:var(--text)}
.nav a:hover{color:var(--accent)}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:44px;padding:10px 20px;text-decoration:none;font-weight:500;border:1px solid transparent;cursor:pointer;font-family:inherit;font-size:inherit;letter-spacing:.06em}
.btn-primary{background:var(--accent);color:var(--bg)}
.btn-primary:hover{background:var(--text);color:var(--bg)}
.btn-outline{border-color:var(--line-2);color:var(--text);background:transparent}
.btn-outline:hover{border-color:var(--accent);color:var(--accent)}
.btn-lg{min-height:52px;padding:16px 40px;font-weight:700;letter-spacing:.08em}
.btn[aria-disabled="true"]{opacity:.55;cursor:not-allowed}

/* Sections */
section{border-bottom:1px solid var(--line)}
.section{padding-block:104px;display:flex;flex-direction:column;gap:48px}
.eyebrow{font-family:var(--mono);font-size:14px;color:var(--accent);letter-spacing:.14em}
.head{display:flex;flex-direction:column;gap:8px}
.head-row{display:flex;flex-wrap:wrap;justify-content:space-between;align-items:flex-end;gap:24px}
.head-row p{margin:0;max-width:460px;color:var(--muted);font-size:16px}
h1,h2,h3{margin:0}
h2{font-size:clamp(28px,3.4vw,36px);font-weight:700}

/* Hero */
.hero .wrap{padding-block:96px;display:flex;flex-wrap:wrap;gap:56px;align-items:center}
.hero-text{flex:1 1 480px;min-width:0;display:flex;flex-direction:column;gap:28px}
.hero-text .eyebrow{letter-spacing:.14em}
.hero h1{font-size:clamp(36px,5.2vw,56px);line-height:1.35;font-weight:700;letter-spacing:.02em}
.hero-lead{margin:0;color:var(--muted);max-width:520px}
.spec{margin:0;border:1px solid var(--line-2);background:var(--panel);font-size:15px}
.spec div{display:flex;flex-wrap:wrap;gap:4px 24px;padding:12px 18px;border-bottom:1px solid var(--line)}
.spec div:last-child{border-bottom:0}
.spec dt{flex:0 0 96px;font-family:var(--mono);color:var(--muted)}
.spec dd{margin:0;flex:1 1 240px;min-width:0}
.plan{flex:1 1 440px;min-width:0;margin:0;border:1px solid var(--line-2);background:var(--panel);padding:28px;display:flex;flex-direction:column;gap:14px}
.plan-head,.plan figcaption{font-family:var(--mono);font-size:13px;color:var(--muted)}
.plan-head{display:flex;justify-content:space-between;gap:12px}
.plan svg{width:100%;height:auto;display:block}

/* Cards */
.cards{display:flex;flex-wrap:wrap;gap:24px}
.card{flex:1 1 320px;min-width:0;border:1px solid var(--line-2);background:var(--panel);display:flex;flex-direction:column}
.card-body{padding:32px 28px;display:flex;flex-direction:column;gap:14px;flex-grow:1}
.card-body h3{font-size:22px;font-weight:700}
.card-body p{margin:0;color:var(--muted);font-size:16px}
.titleblock{display:flex;border-top:1px solid var(--line-2);font-family:var(--mono);font-size:13px;color:var(--muted)}
.titleblock span{padding:10px 14px}
.titleblock span:first-child{flex:1 1 auto;border-right:1px solid var(--line-2)}
.work{flex-basis:340px}
.work .ph{aspect-ratio:4/3;background:#13233D;border-bottom:1px solid var(--line-2);display:flex;align-items:center;justify-content:center;color:var(--muted);font-family:var(--mono);font-size:13px}
.work .ph img{width:100%;height:100%;object-fit:cover;display:block}
.work .card-body{padding:24px 24px 28px;gap:10px}
.work .card-body h3{font-size:20px}
.work .card-body p{font-size:15px}
.tag{font-family:var(--mono);font-size:13px;color:var(--accent);letter-spacing:.1em}
.note{margin:0;font-family:var(--mono);font-size:13px;color:var(--muted)}

/* Contact band */
.cta .wrap{padding-block:104px;display:flex;flex-wrap:wrap;gap:32px;justify-content:space-between;align-items:center}
.cta-text{display:flex;flex-direction:column;gap:10px}
.cta-text p{margin:0;color:var(--muted);font-size:16px}

/* Forms */
.form-wrap .wrap{padding-block:88px;display:flex;flex-wrap:wrap;gap:56px}
.form-intro{flex:1 1 320px;min-width:0;display:flex;flex-direction:column;gap:16px}
.form-intro p{margin:0;color:var(--muted);font-size:16px}
form.contact{flex:1 1 480px;min-width:0;border:1px solid var(--line-2);background:var(--panel);padding:36px;display:flex;flex-direction:column;gap:18px}
.field{display:flex;flex-direction:column;gap:6px}
.field label{font-size:15px;font-weight:500}
.req{font-family:var(--mono);font-size:11px;color:var(--warn);margin-left:8px}
.field input,.field select,.field textarea{min-height:48px;border:1px solid var(--line-2);background:var(--bg-deep);color:var(--text);padding:10px 14px;font-size:15px;font-family:inherit;width:100%}
.field textarea{min-height:160px;resize:vertical}
.field input:focus,.field select:focus,.field textarea:focus{border-color:var(--accent);outline:none}
.check{display:flex;gap:10px;align-items:flex-start;font-size:14px}
.check input{width:20px;height:20px;margin-top:4px;accent-color:var(--accent)}
.hp{position:absolute;left:-9999px;width:1px;height:1px;overflow:hidden}
.status{margin:0;font-size:14px;min-height:1.8em}
.status.ok{color:#9ED8A8}
.status.err{color:var(--warn)}

.h1-page{font-size:clamp(28px,3.4vw,36px)}
.self-start{align-self:flex-start}

/* Text pages */
.doc .wrap{padding-block:88px;max-width:860px}
.doc h1{font-size:clamp(28px,3.4vw,36px);margin-bottom:24px}
.doc h2{font-size:20px;margin:32px 0 8px}
.doc p,.doc li{color:var(--muted)}

/* Footer */
.site-footer{border-top:1px solid var(--line)}
.site-footer .wrap{padding-block:32px;display:flex;flex-wrap:wrap;justify-content:space-between;gap:16px;font-family:var(--mono);font-size:13px;color:var(--muted)}
.site-footer a{color:var(--muted)}
.site-footer nav{display:flex;gap:20px;flex-wrap:wrap}

/* Biểu tượng trục toạ độ (UCS) + nút phóng, cố định góc dưới trái */
.ucs{position:fixed;left:24px;bottom:24px;z-index:70;color:var(--accent);pointer-events:none;width:80px;height:80px}
.ucs>svg{display:block;opacity:.85}
.zoom-btn{pointer-events:auto;position:absolute;left:28px;top:18px;width:44px;height:44px;display:flex;align-items:center;justify-content:center;border:0;background:transparent;color:var(--accent);cursor:pointer;padding:0}
.zoom-btn svg{filter:drop-shadow(0 0 2px rgba(11,22,40,0.9))}
.zoom-btn:hover{color:var(--text)}
.zoom-btn[aria-pressed="true"]{color:var(--text)}
.zoom-level{position:absolute;left:58px;top:12px;font-family:var(--mono);font-size:13px;color:var(--accent);white-space:nowrap}
.zoom-sel{position:fixed;display:none;border:1px dashed var(--accent);background:rgba(154,214,240,0.08);pointer-events:none;z-index:80}
.zoom-hint{display:none;position:fixed;left:50%;bottom:20px;transform:translateX(-50%);z-index:75;width:max-content;max-width:calc(100vw - 220px);padding:10px 12px;background:rgba(7,15,29,0.94);border:1px solid var(--line-2);color:var(--text);font-size:14px;line-height:1.6;text-align:center;pointer-events:none}
.zoom-hint span{display:inline-block;white-space:nowrap;margin:0 10px}
.zoom-hint span+span::before{content:"｜";margin-right:20px;color:var(--line-2)}
.zoom-hint kbd{font-family:var(--mono);font-size:13px;border:1px solid var(--line-2);padding:0 6px}
html.zoomed .zoom-hint{display:block}
#canvas{transform-origin:0 0}
html.zoomed,html.zoomed body{overflow:hidden;height:100%;overscroll-behavior:none}
html.zoomed #canvas{position:fixed;left:0;top:0;width:100vw}
html.zoomed .site-header{position:relative}

@media (max-width:720px){
  .ucs{left:8px;bottom:8px}
  .zoom-hint{left:auto;right:8px;bottom:96px;transform:none;max-width:calc(100vw - 16px);font-size:13px}
  .wrap{padding-inline:20px}
  .section,.hero .wrap,.cta .wrap{padding-block:72px}
  .nav{gap:6px 18px}
  form.contact{padding:24px}
  html{scroll-padding-top:150px}
}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}