/* ==========================================================================
   Chalcon Engineering — website theme "Engineering Record"
   ทิศทางแบรนด์ปี 2026 — บันทึกไว้ใน Chalcon CI Manual v2.0
   ========================================================================== */
:root{
  --ink:#14181a; --ink-2:#333c40;
  --deep:#06323f; --deep-2:#0a4353;
  --brand:#0088b0; --brand-lift:#41bade; --brand-deep:#046985;
  --paper:#ffffff; --mist:#f1f4f5; --line:#d9dfe1; --muted:#6b777c;
  --wrap:1280px;
  --display:'Archivo','Noto Sans Thai','Noto Sans SC',system-ui,sans-serif;
  --body:'Archivo','Noto Sans Thai','Noto Sans SC',system-ui,sans-serif;
  --mono:'IBM Plex Mono',ui-monospace,SFMono-Regular,monospace;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;scroll-padding-top:76px}
body{font-family:var(--body);color:var(--ink);background:var(--paper);
  font-size:16px;line-height:1.6;-webkit-font-smoothing:antialiased;overflow-x:hidden}
img{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
.wrap{max-width:var(--wrap);margin:0 auto;padding:0 clamp(20px,4vw,56px)}

/* ---------- type ---------- */
.display{font-family:var(--display);font-weight:800;font-stretch:84%;
  text-transform:uppercase;letter-spacing:-.015em;line-height:.95;text-wrap:balance}
html[lang="th"] .display,html[lang="zh-Hans"] .display{
  text-transform:none;font-stretch:100%;line-height:1.24;letter-spacing:0}
.h1{font-size:clamp(38px,6.6vw,84px)}
.h2{font-size:clamp(30px,4.6vw,58px)}
.h3{font-size:clamp(21px,2.3vw,28px);font-weight:700}
.kicker{font-family:var(--mono);font-size:11px;letter-spacing:.22em;
  text-transform:uppercase;color:var(--brand)}
.kicker.on-dark{color:var(--brand-lift)}
html[lang="th"] .kicker,html[lang="zh-Hans"] .kicker{letter-spacing:.02em}
.lede{font-size:clamp(16px,1.55vw,19px);line-height:1.65;color:var(--ink-2);max-width:60ch}
.lede.on-dark{color:#c3d3d8}

/* ---------- buttons ---------- */
.btn{display:inline-flex;align-items:center;gap:12px;font-family:var(--display);
  font-weight:700;font-size:13px;letter-spacing:.1em;text-transform:uppercase;
  padding:16px 26px;border:1px solid transparent;cursor:pointer;transition:.18s ease}
html[lang="th"] .btn,html[lang="zh-Hans"] .btn{text-transform:none;letter-spacing:.02em;font-size:14px}
.btn svg{flex:none;transition:transform .18s ease}
.btn:hover svg{transform:translateX(4px)}
.btn-primary{background:var(--brand);color:#fff}
.btn-primary:hover{background:var(--brand-deep)}
.btn-ghost{border-color:currentColor;color:var(--ink)}
.btn-ghost:hover{background:var(--ink);color:#fff;border-color:var(--ink)}
.btn-ghost.on-dark{color:#fff}
.btn-ghost.on-dark:hover{background:#fff;color:var(--deep);border-color:#fff}

/* ---------- drawing-sheet corner marks ---------- */
.marks{position:absolute;inset:0;pointer-events:none;z-index:3;color:#fff}
.marks i{position:absolute;width:13px;height:13px;opacity:.55;
  background:
    linear-gradient(currentColor,currentColor) center/1px 100% no-repeat,
    linear-gradient(currentColor,currentColor) center/100% 1px no-repeat}
.marks i:nth-child(1){top:14px;left:14px}
.marks i:nth-child(2){top:14px;right:14px}
.marks i:nth-child(3){bottom:14px;left:14px}
.marks i:nth-child(4){bottom:14px;right:14px}

/* ---------- duotone photo (atmosphere only) ---------- */
.duo{position:absolute;inset:0;overflow:hidden}
.duo img{width:100%;height:100%;object-fit:cover;
  filter:grayscale(1) contrast(1.06) brightness(.96)}
.duo .tint{position:absolute;inset:0;background:var(--brand);mix-blend-mode:color;opacity:.9}
.duo .shade{position:absolute;inset:0;background:
  linear-gradient(180deg,rgba(4,28,36,.62) 0%,rgba(4,28,36,.18) 34%,rgba(4,28,36,.9) 100%)}

/* ---------- nav ---------- */
.nav{position:fixed;top:0;left:0;right:0;z-index:60;transition:background .25s,border-color .25s}
.nav-in{display:flex;align-items:center;gap:clamp(16px,3vw,44px);height:76px;color:#fff}
.nav.solid,.nav.menu-open{background:rgba(6,50,63,.97);
  border-bottom:1px solid rgba(255,255,255,.12);backdrop-filter:blur(8px)}
.brand{display:flex;align-items:center;margin-right:auto}
/* กล่อง 68px = วง 34px + clear space 17px (3.5x) ทุกด้าน ตาม CI หน้า 05 */
.brand .mark{width:68px;height:68px;flex:none;margin:-17px 0;
  color:#fff;transition:color .25s}
.nav.solid .brand .mark,.nav.menu-open .brand .mark{color:var(--brand-lift)}
.brand .wm{margin-left:0}
.brand .wm b{display:block;font-family:var(--display);font-weight:800;font-size:19px;
  letter-spacing:-.01em;line-height:1;text-transform:none}
.brand .wm>span{display:block;font-family:var(--mono);font-size:8.5px;letter-spacing:.26em;
  text-transform:uppercase;margin-top:3px;opacity:.85}
.nav-links{display:flex;gap:clamp(14px,2.2vw,30px)}
.nav-links a{font-family:var(--display);font-weight:600;font-size:13px;letter-spacing:.08em;
  text-transform:uppercase;padding:8px 0;border-bottom:2px solid transparent;transition:.18s}
html[lang="th"] .nav-links a,html[lang="zh-Hans"] .nav-links a{
  text-transform:none;letter-spacing:.01em;font-size:14.5px}
.nav-links a:hover{border-color:var(--brand-lift)}
.langs{display:flex;align-items:center;gap:2px}
.langs button{font-family:var(--mono),var(--body);font-size:11px;letter-spacing:.1em;
  background:none;border:none;color:rgba(255,255,255,.55);padding:6px 7px;cursor:pointer;
  transition:.15s}
.langs button:hover{color:#fff}
.langs button[aria-pressed="true"]{color:#fff;box-shadow:inset 0 -2px 0 var(--brand-lift)}
.login{font-family:var(--display);font-weight:700;font-size:12px;letter-spacing:.08em;
  text-transform:uppercase;border:1px solid rgba(255,255,255,.4);padding:10px 16px;
  white-space:nowrap;transition:.18s}
html[lang="th"] .login,html[lang="zh-Hans"] .login{text-transform:none;letter-spacing:0;font-size:13px}
.login:hover{background:#fff;color:var(--deep);border-color:#fff}
.burger{display:none;background:none;border:1px solid rgba(255,255,255,.4);
  width:42px;height:38px;cursor:pointer;position:relative}
.burger span{position:absolute;left:11px;right:11px;height:2px;background:#fff;transition:.2s}
.burger span:nth-child(1){top:12px}
.burger span:nth-child(2){top:18px}
.burger span:nth-child(3){top:24px}

/* ---------- hero ---------- */
.hero{position:relative;min-height:min(94vh,900px);display:flex;align-items:flex-end;
  background:var(--deep);overflow:hidden}
.hero-slides{position:absolute;inset:0}
.hero-slide{position:absolute;inset:0;opacity:0;transition:opacity 1.1s ease}
.hero-slide.on{opacity:1}
.hero-slide img{transform:scale(1.06);transition:transform 7s linear}
.hero-slide.on img{transform:scale(1)}
.hero-in{position:relative;z-index:4;width:100%;padding-top:150px;padding-bottom:46px;color:#fff}
.hero h1{margin:20px 0 0;max-width:15ch}
.hero-foot{display:flex;flex-wrap:wrap;align-items:flex-end;gap:28px 44px;margin-top:40px}
.hero-foot .lede{flex:1 1 320px}
.hero-cta{display:flex;flex-wrap:wrap;gap:12px}
.hero-meta{margin-left:auto;text-align:right;color:#fff;max-width:250px;flex:0 1 auto}
.hero-meta .loc{font-family:var(--mono);font-size:10px;letter-spacing:.2em;
  text-transform:uppercase;color:var(--brand-lift)}
html[lang="th"] .hero-meta .loc,html[lang="zh-Hans"] .hero-meta .loc{letter-spacing:.02em}
.hero-meta .nm{font-family:var(--display);font-weight:700;font-size:15px;line-height:1.35;
  margin-top:6px}
.dots{display:flex;gap:7px;justify-content:flex-end;margin-top:16px}
.dots button{width:26px;height:3px;background:rgba(255,255,255,.35);border:none;padding:0;
  cursor:pointer;transition:.2s}
.dots button[aria-pressed="true"]{background:var(--brand-lift)}

/* ---------- stat band ---------- */
.band{background:var(--deep);color:#fff;padding:clamp(46px,6vw,74px) 0}
.band-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(160px,1fr));
  gap:clamp(26px,4vw,54px)}
.stat b{font-family:var(--display);font-weight:800;font-stretch:84%;
  font-size:clamp(44px,5.4vw,68px);line-height:.9;display:block;color:#fff}
.stat .lbl{margin-top:12px;font-size:14px;line-height:1.45;color:#a9c1c8}
.stat .bar{display:block;width:44px;height:3px;background:var(--brand-lift);margin-bottom:18px}

/* ---------- generic section ---------- */
.sec{padding:clamp(64px,8.5vw,124px) 0}
.sec.mist{background:var(--mist)}
.sec-head{display:flex;flex-wrap:wrap;gap:26px 60px;align-items:flex-end;
  margin-bottom:clamp(38px,5vw,64px)}
.sec-head .t{flex:1 1 420px;min-width:0}
.sec-head .t h2{margin-top:18px}
.sec-head .p{flex:1 1 330px;min-width:0}

/* ---------- capabilities ---------- */
.stages{border-top:1px solid var(--line)}
.stage{display:grid;grid-template-columns:clamp(64px,8vw,110px) minmax(0,1.05fr) minmax(0,1.25fr);
  gap:clamp(12px,3vw,44px);padding:clamp(24px,3.4vw,38px) 0;
  border-bottom:1px solid var(--line);transition:.2s}
.stage:hover{background:#fff}
.stage .n{font-family:var(--display);font-weight:800;font-stretch:84%;
  font-size:clamp(30px,4vw,46px);line-height:.9;color:var(--brand)}
.stage .ttl{font-family:var(--display);font-weight:700;font-size:clamp(18px,1.9vw,23px);
  line-height:1.3}
.stage .sub{font-family:var(--mono);font-size:10.5px;letter-spacing:.14em;
  text-transform:uppercase;color:var(--muted);margin-top:8px}
.stage p{font-size:15px;line-height:1.68;color:var(--ink-2)}
.stage .deliv{margin-top:17px;padding-top:13px;border-top:1px solid var(--line)}
.stage .deliv .lbl{font-family:var(--mono);font-size:9.5px;letter-spacing:.18em;
  text-transform:uppercase;color:var(--muted);margin-bottom:9px}
.stage .dl{display:flex;flex-wrap:wrap;row-gap:5px}
.stage .dl span{font-family:var(--mono);font-size:11px;line-height:1.5;color:var(--ink-2)}
.stage .dl span:not(:last-child)::after{content:'·';color:var(--brand);margin:0 9px}
html[lang="th"] .stage .sub,html[lang="zh-Hans"] .stage .sub,
html[lang="th"] .stage .deliv .lbl,html[lang="zh-Hans"] .stage .deliv .lbl,
html[lang="th"] .stage .dl span,html[lang="zh-Hans"] .stage .dl span{letter-spacing:.02em}

/* ---------- work — project photos stay in natural colour ---------- */
.work-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(320px,1fr));
  gap:clamp(28px,3.4vw,44px)}
.card{display:flex;flex-direction:column}
.shot{position:relative;aspect-ratio:3/2;overflow:hidden;background:var(--deep)}
.shot .reel{display:flex;height:100%;transition:transform .45s cubic-bezier(.4,0,.2,1)}
.shot .reel figure{flex:0 0 100%;height:100%}
.shot .reel img{width:100%;height:100%;object-fit:cover}
.shot .cat{position:absolute;top:0;left:0;z-index:4;background:var(--brand);color:#fff;
  font-family:var(--mono);font-size:10px;letter-spacing:.16em;text-transform:uppercase;
  padding:7px 12px}
html[lang="th"] .shot .cat,html[lang="zh-Hans"] .shot .cat{letter-spacing:.02em}
.shot .arrows{position:absolute;inset:auto 0 0 0;z-index:4;display:flex;
  justify-content:space-between;align-items:center;padding:10px;opacity:0;transition:.2s}
.card:hover .arrows,.shot:focus-within .arrows{opacity:1}
.shot .arrows button{width:36px;height:36px;display:grid;place-items:center;cursor:pointer;
  background:rgba(4,28,36,.72);border:1px solid rgba(255,255,255,.35);color:#fff;transition:.15s}
.shot .arrows button:hover{background:var(--brand);border-color:var(--brand)}
.shot .count{font-family:var(--mono);font-size:10px;letter-spacing:.12em;color:#fff;
  background:rgba(4,28,36,.72);padding:7px 10px}
.card .body{padding-top:18px}
.card h3{font-family:var(--display);font-weight:700;font-size:20px;line-height:1.32;
  text-wrap:pretty}
.card .meta{display:flex;flex-wrap:wrap;gap:6px 18px;margin-top:12px;
  padding-top:12px;border-top:1px solid var(--line)}
.card .meta div{font-family:var(--mono);font-size:10.5px;letter-spacing:.1em;
  text-transform:uppercase;color:var(--muted)}
.card .meta b{color:var(--ink);font-weight:600}
.card .meta.is-empty{display:none}
html[lang="th"] .card .meta div,html[lang="zh-Hans"] .card .meta div{letter-spacing:.02em}
.card p{font-size:14.5px;line-height:1.6;color:var(--ink-2);margin-top:12px}

/* ---------- about ---------- */
.about{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));
  gap:clamp(30px,4.5vw,72px);align-items:center}
.about-fig{position:relative;aspect-ratio:4/3;overflow:hidden}
.about p{margin-top:18px}
.creds{display:flex;flex-wrap:wrap;gap:10px;margin-top:30px}
.cred{font-family:var(--mono);font-size:10.5px;letter-spacing:.13em;text-transform:uppercase;
  border:1px solid var(--line);padding:9px 14px;color:var(--ink-2)}
.cred.fill{background:var(--brand);border-color:var(--brand);color:#fff}
html[lang="th"] .cred,html[lang="zh-Hans"] .cred{letter-spacing:.02em;font-size:12px}

/* ---------- contact ---------- */
.contact{background:var(--deep);color:#fff}
.contact-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(290px,1fr));
  gap:clamp(32px,4.5vw,76px)}
.contact h2{margin:20px 0 22px}
.cinfo{display:flex;flex-direction:column;gap:26px}
.cinfo .lbl{font-family:var(--mono);font-size:10px;letter-spacing:.2em;text-transform:uppercase;
  color:var(--brand-lift);margin-bottom:8px}
html[lang="th"] .cinfo .lbl,html[lang="zh-Hans"] .cinfo .lbl{letter-spacing:.02em}
.cinfo .val{font-size:16.5px;line-height:1.6}
.cinfo a:hover{color:var(--brand-lift)}
.person{display:flex;gap:12px;align-items:baseline}
.person span{font-size:13.5px;color:#93aeb6}

/* ---------- footer ---------- */
.foot{background:#041c24;color:#8fa8b0;padding:44px 0}
.foot-in{display:flex;flex-wrap:wrap;gap:18px 32px;align-items:center;justify-content:space-between}
.foot-links{display:flex;flex-wrap:wrap;gap:22px;font-size:13px}
.foot-links a:hover{color:#fff}
.foot .cp{font-size:13px}

/* ---------- reveal ---------- */
.rise{opacity:0;transform:translateY(22px);transition:opacity .7s ease,transform .7s ease}
.rise.in{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){
  .rise{opacity:1;transform:none;transition:none}
  .hero-slide img{transition:none;transform:none}
  html{scroll-behavior:auto}
}

/* ---------- responsive ---------- */
@media (max-width:900px){
  .stage{grid-template-columns:56px 1fr;row-gap:12px}
  .stage>div:last-child{grid-column:2}
  .nav-links,.login{display:none}
  .burger{display:block;order:3}
  .nav-links.open{display:flex;position:absolute;top:76px;left:0;right:0;flex-direction:column;
    background:var(--deep);padding:12px clamp(20px,4vw,56px) 24px;gap:2px;
    border-bottom:1px solid rgba(255,255,255,.14);box-shadow:0 18px 34px rgba(4,28,36,.32)}
  .nav-links.open a{padding:13px 0;border-bottom:1px solid rgba(255,255,255,.1)}
  .hero-meta{text-align:left;max-width:none;margin-left:0;margin-top:8px}
  .dots{justify-content:flex-start}
  .hero-in{padding-top:120px}
}