/* Optimus Solutions · Reference — shares tokens with optimus.in.th */
:root{
  --paper:#F5F4FB; --surface:#FFFFFF; --ink:#15104A; --muted:#55527A; --line:#E2DFF1;
  --brand:#D03A12; --brand-2:#FF7A2E; --signal:#4A36D6; --signal-soft:rgba(74,54,214,.10);
  --btn:#E4461B; --btn-h:#F2561F; --line-green:#06C755;
  --night:#130B52; --night-2:#0A0633; --night-ink:#F5F4FF; --night-muted:#BAB5E8; --night-line:rgba(255,255,255,.13);
  --f-display:"Outfit","Kanit","IBM Plex Sans Thai",system-ui,sans-serif;
  --f-thai-display:"Kanit","Outfit",system-ui,sans-serif;
  --f-body:"IBM Plex Sans Thai","Outfit",Tahoma,system-ui,sans-serif;
  --f-label:"Outfit","IBM Plex Sans Thai",system-ui,sans-serif;
  --wrap:1200px; --r:16px;
}
@media (prefers-color-scheme: dark){:root:not([data-theme="light"]){
  --paper:#0C0832; --surface:#151049; --ink:#EEEDFB; --muted:#A9A5D6; --line:#2A2470;
  --brand:#FF6A3D; --brand-2:#FF9A4A; --signal:#9C8CFF; --signal-soft:rgba(156,140,255,.14);
  --btn:#F0501F; --btn-h:#FF6532; color-scheme:dark}}
:root[data-theme="dark"]{
  --paper:#0C0832; --surface:#151049; --ink:#EEEDFB; --muted:#A9A5D6; --line:#2A2470;
  --brand:#FF6A3D; --brand-2:#FF9A4A; --signal:#9C8CFF; --signal-soft:rgba(156,140,255,.14);
  --btn:#F0501F; --btn-h:#FF6532; color-scheme:dark}

*{box-sizing:border-box}
html{font-size:106.25%;scroll-behavior:smooth}
body{margin:0;background:var(--paper);color:var(--ink);font-family:var(--f-body);line-height:1.7;-webkit-font-smoothing:antialiased}
img{max-width:100%}
[hidden]{display:none!important}
html[data-lang="en"] .th{display:none!important}
html:not([data-lang="en"]) .en{display:none!important}
a{color:inherit}
h1,h2,h3{font-family:var(--f-display);line-height:1.2;margin:0;text-wrap:balance;font-weight:700}
p{margin:0}
.wrap{max-width:var(--wrap);margin-inline:auto;padding-inline:clamp(16px,4vw,40px)}
.kicker{font-family:var(--f-label);font-size:.8rem;font-weight:600;letter-spacing:.18em;text-transform:uppercase;color:var(--brand)}
:focus-visible{outline:2px solid var(--brand-2);outline-offset:3px;border-radius:4px}
.num{font-family:var(--f-label);font-weight:600;font-variant-numeric:tabular-nums}

.btn{display:inline-flex;align-items:center;gap:.5rem;padding:.8rem 1.3rem;border-radius:999px;font-weight:600;font-size:1rem;text-decoration:none;border:1.5px solid transparent;cursor:pointer;font-family:var(--f-body);line-height:1.2;transition:transform .15s,background .15s,border-color .15s}
.btn:hover{transform:translateY(-1px)}
.btn-primary{background:var(--btn);color:#fff}
.btn-primary:hover{background:var(--btn-h)}
.btn-ghost{background:var(--surface);color:var(--ink);border-color:var(--line)}
.btn-ghost:hover{border-color:var(--ink)}
.on-night .btn-ghost{background:transparent;color:#fff;border-color:rgba(255,255,255,.3)}
.btn-line{background:var(--line-green);color:#fff}
.btn svg{width:18px;height:18px}

.on-night{background:var(--night);color:var(--night-ink);position:relative;isolation:isolate;overflow:hidden}
.glow{position:absolute;inset:0;z-index:-2;pointer-events:none;
  background:radial-gradient(42% 60% at 55% 0%,rgba(150,40,120,.5),transparent 70%),radial-gradient(55% 80% at 60% 60%,rgba(70,30,190,.5),transparent 72%),radial-gradient(40% 60% at 5% 100%,rgba(30,60,170,.4),transparent 70%),linear-gradient(180deg,var(--night),var(--night-2))}
.rings{position:absolute;z-index:-1;pointer-events:none;border-radius:50%;border:1px solid rgba(255,122,46,.22)}

/* header */
.site-head{position:sticky;top:env(safe-area-inset-top,0px);z-index:50;background:rgba(14,8,62,.94);backdrop-filter:blur(12px);border-bottom:1px solid var(--night-line);color:var(--night-ink)}
.head-row{display:flex;align-items:center;gap:1.3rem;min-height:72px}
.logo img{height:40px;width:auto;display:block;max-width:none}
.nav{display:flex;gap:1.2rem;margin-left:auto;font-size:.95rem}
.nav a{text-decoration:none;color:var(--night-muted)}
.nav a:hover,.nav a[aria-current="page"]{color:#fff}
.nav a[aria-current="page"]{box-shadow:inset 0 -2px 0 #FF7A3D}
.head-tools{display:flex;align-items:center;gap:.6rem}
.lang{display:flex;border:1px solid var(--night-line);border-radius:999px;padding:2px;font-family:var(--f-label);font-size:.78rem;font-weight:600}
.lang button{border:0;background:none;color:var(--night-muted);padding:.32rem .65rem;border-radius:999px;cursor:pointer;font:inherit}
.lang button[aria-pressed="true"]{background:#fff;color:var(--night)}
.head-call{padding:.6rem 1rem;font-size:.92rem}
.menu-btn{display:none;border:1px solid var(--night-line);background:transparent;color:#fff;border-radius:10px;width:42px;height:42px;cursor:pointer}
@media (max-width:1080px){
  .nav{display:none;position:absolute;top:100%;left:0;right:0;flex-direction:column;gap:0;background:var(--night);border-bottom:1px solid var(--night-line);padding:.5rem clamp(16px,4vw,40px) 1rem}
  .nav.open{display:flex}
  .nav a{padding:.75rem 0;border-bottom:1px solid var(--night-line)}
  .nav a[aria-current="page"]{box-shadow:none;color:#FF8A4C}
  .head-tools{margin-left:auto}.menu-btn{display:grid;place-items:center}
}
@media (max-width:640px){.head-call .lbl{display:none}.head-call{padding:.6rem .75rem}.logo img{height:30px}}
@media (max-width:480px){.logo img{height:25px}.head-row{gap:.5rem}.head-tools{gap:.4rem}.lang button{padding:.3rem .5rem}}

/* page hero */
.ref-hero{padding-block:clamp(40px,6vw,72px) clamp(36px,5vw,56px)}
.ref-hero .kicker{color:#FF8A4C}
.ref-hero h1{font-size:clamp(2.2rem,5.4vw,3.8rem);margin-block:.6rem .9rem}
.ref-hero p{color:var(--night-muted);max-width:40em}
.stats{display:flex;flex-wrap:wrap;gap:.6rem 2.2rem;margin-top:1.6rem}
.stats div{display:grid}
.stats b{font-family:var(--f-label);font-size:1.9rem;font-weight:700;color:#fff;line-height:1.1}
.stats span{font-size:.85rem;color:var(--night-muted)}
.crumb{font-size:.88rem;color:var(--night-muted);margin-bottom:.6rem}
.crumb a{color:#fff;text-decoration:none;border-bottom:1px solid rgba(255,255,255,.3)}

/* filters */
.filters{position:relative;margin-top:-28px;z-index:2}
.filter-card{background:var(--surface);border:1px solid var(--line);border-radius:var(--r);box-shadow:0 16px 40px rgba(21,16,74,.10);padding:1.1rem 1.2rem;display:grid;grid-template-columns:minmax(0,1fr);gap:.9rem}
@media (max-width:520px){.search .btn span{display:none}.search .btn{padding:.7rem .85rem}}
.search{display:flex;gap:.6rem}
.search input{flex:1;min-width:0;border:1.5px solid var(--line);background:var(--paper);color:var(--ink);border-radius:999px;padding:.7rem 1.1rem;font:inherit}
.search input:focus{outline:none;border-color:var(--signal)}
.chiprow{display:flex;flex-wrap:wrap;gap:.45rem;align-items:center}
.chiprow .lbl{font-family:var(--f-label);font-size:.72rem;letter-spacing:.14em;font-weight:700;color:var(--muted);text-transform:uppercase;margin-right:.3rem}
.chip{display:inline-flex;align-items:center;gap:.35rem;padding:.38rem .85rem;border-radius:999px;border:1px solid var(--line);background:var(--surface);font-size:.9rem;text-decoration:none;color:var(--ink);white-space:nowrap}
.chip small{font-family:var(--f-label);color:var(--muted);font-size:.75rem}
.chip:hover{border-color:var(--signal)}
.chip.on{background:var(--night);border-color:var(--night);color:#fff}
.chip.on small{color:#FF9A5C}
.tag{color:var(--signal);text-decoration:none;font-family:var(--f-label);font-weight:500;font-size:.88rem}
.tag:hover{text-decoration:underline}
.tag.on{background:var(--signal);color:#fff;border-radius:999px;padding:.12rem .55rem}
.active-filters{display:flex;flex-wrap:wrap;gap:.5rem;align-items:center;font-size:.9rem;color:var(--muted)}
.active-filters a.clear{color:var(--brand);font-weight:600}

/* grid */
.results{padding-block:clamp(32px,5vw,56px) clamp(56px,8vw,96px)}
.results-head{display:flex;justify-content:space-between;align-items:baseline;gap:1rem;margin-bottom:1.1rem;flex-wrap:wrap}
.results-head h2{font-size:1.4rem}
.results-head span{color:var(--muted);font-size:.92rem}
.grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:1.2rem}
@media (max-width:980px){.grid{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media (max-width:600px){.grid{grid-template-columns:1fr}}
.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--r);overflow:hidden;display:flex;flex-direction:column;min-width:0;text-decoration:none;color:inherit;box-shadow:0 8px 24px rgba(21,16,74,.05);transition:transform .2s,box-shadow .2s}
.card:hover{transform:translateY(-3px);box-shadow:0 16px 40px rgba(21,16,74,.12)}
.card figure{margin:0;aspect-ratio:4/3;background:linear-gradient(150deg,#2A1A8F,#130B52);position:relative;max-width:100%}
.card figure img{width:100%;height:100%;object-fit:cover;display:block}
.card figure .noimg{position:absolute;inset:0;display:grid;place-items:center;color:rgba(255,255,255,.55);font-family:var(--f-label);font-size:.85rem}
.card .feat{position:absolute;top:12px;left:12px;background:linear-gradient(145deg,#FF7A2E,#F0401F);color:#fff;font-family:var(--f-label);font-size:.72rem;font-weight:700;letter-spacing:.08em;padding:.25rem .6rem;border-radius:999px}
.card-body{padding:1.1rem 1.2rem 1.25rem;display:flex;flex-direction:column;gap:.5rem;flex:1}
.cats{display:flex;flex-wrap:wrap;gap:.35rem}
.cat{font-family:var(--f-label);font-size:.7rem;font-weight:700;letter-spacing:.06em;color:var(--brand);background:color-mix(in srgb,var(--brand) 9%,transparent);border-radius:999px;padding:.15rem .6rem;text-transform:uppercase;text-decoration:none}
.card h3{font-size:1.18rem;line-height:1.35}
.meta{font-size:.88rem;color:var(--muted);display:flex;flex-wrap:wrap;gap:.2rem .9rem}
.card .tags{display:flex;flex-wrap:wrap;gap:.15rem .7rem;margin-top:auto;padding-top:.3rem}
.empty{text-align:center;padding:3.5rem 1rem;border:1.5px dashed var(--line);border-radius:var(--r);color:var(--muted)}
.empty h3{color:var(--ink);margin-bottom:.4rem}
.pager{display:flex;justify-content:center;gap:.4rem;margin-top:2rem;flex-wrap:wrap}
.pager a,.pager span{min-width:42px;height:42px;display:grid;place-items:center;border-radius:12px;border:1px solid var(--line);background:var(--surface);text-decoration:none;font-family:var(--f-label);font-weight:600;padding-inline:.6rem}
.pager span.cur{background:var(--night);color:#fff;border-color:var(--night)}

/* project detail */
.detail{padding-block:clamp(28px,4vw,48px) clamp(56px,8vw,96px)}
.detail-grid{display:grid;grid-template-columns:minmax(0,1.5fr) minmax(0,1fr);gap:clamp(24px,4vw,48px);align-items:start}
@media (max-width:900px){.detail-grid{grid-template-columns:1fr}}
.gallery{display:grid;gap:.6rem}
.gallery .main{border-radius:var(--r);overflow:hidden;background:#130B52;aspect-ratio:4/3;max-width:100%;cursor:zoom-in;border:0;padding:0;display:block;width:100%}
.gallery .main img{width:100%;height:100%;object-fit:cover;display:block}
.thumbs{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:.5rem}
.thumbs button{border:2px solid transparent;border-radius:10px;overflow:hidden;padding:0;aspect-ratio:4/3;cursor:pointer;background:var(--line)}
.thumbs button[aria-current="true"]{border-color:var(--brand-2)}
.thumbs img{width:100%;height:100%;object-fit:cover;display:block}
.info{background:var(--surface);border:1px solid var(--line);border-radius:var(--r);padding:1.4rem 1.5rem;display:grid;gap:1.1rem;position:sticky;top:96px}
.info dl{margin:0;display:grid;gap:.75rem}
.info dl div{display:grid;grid-template-columns:7rem minmax(0,1fr);gap:.8rem}
.info dt{font-family:var(--f-label);font-size:.72rem;font-weight:700;letter-spacing:.12em;text-transform:uppercase;color:var(--brand);padding-top:.2rem}
.info dd{margin:0}
.desc{font-size:1.02rem;white-space:pre-line}
.related{margin-top:clamp(40px,6vw,72px)}
.related h2{font-size:1.5rem;margin-bottom:1rem}

/* CTA + footer */
.cta{border-radius:24px;padding:clamp(24px,4vw,44px);display:flex;flex-wrap:wrap;gap:1.2rem 2rem;align-items:center;justify-content:space-between;margin-bottom:clamp(48px,7vw,88px)}
.cta h2{font-size:clamp(1.5rem,3vw,2.1rem)}
.cta p{color:var(--night-muted);margin-top:.4rem}
.cta .acts{display:flex;flex-wrap:wrap;gap:.6rem}
.foot{padding-block:2.4rem 6rem;font-size:.9rem;color:var(--night-muted)}
.foot-row{display:flex;flex-wrap:wrap;justify-content:space-between;gap:1rem;align-items:center}
.foot-slogan{font-family:var(--f-label);font-weight:600;letter-spacing:.06em;color:#fff}
.foot-slogan i{font-style:normal;color:#FF7A3D}
.foot a{color:#fff}

.fab{position:fixed;right:16px;bottom:calc(16px + env(safe-area-inset-bottom,0px));display:flex;flex-direction:column;gap:.6rem;z-index:60}
.fab a{width:54px;height:54px;border-radius:50%;display:grid;place-items:center;color:#fff;box-shadow:0 8px 22px rgba(0,0,0,.25)}
.fab .f-line{background:var(--line-green)}
.fab .f-tel{background:linear-gradient(145deg,#FF7A2E,#F0401F)}
.fab svg{width:24px;height:24px}

.lb{position:fixed;inset:0;z-index:100;background:rgba(8,5,40,.94);display:grid;grid-template-columns:auto minmax(0,1fr) auto;align-items:center;gap:.5rem;padding:16px}
.lb img{max-width:100%;max-height:84vh;margin:auto;display:block;border-radius:8px}
.lb button{background:rgba(255,255,255,.1);color:#fff;border:0;width:46px;height:46px;border-radius:50%;cursor:pointer;font-size:1.3rem}
.lb .lb-close{position:absolute;top:14px;right:14px}
.lb .lb-count{position:absolute;bottom:14px;left:0;right:0;text-align:center;color:var(--night-muted);font-family:var(--f-label)}

@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}.card,.btn{transition:none}}

/* articles */
.a-card .excerpt{color:var(--muted);font-size:.93rem;line-height:1.6;display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}
.a-card .meta{margin-top:auto;padding-top:.3rem}
.a-card figure{aspect-ratio:16/9}
.card .vid{position:absolute;right:12px;bottom:12px;display:inline-flex;align-items:center;gap:.3rem;background:rgba(10,6,51,.82);color:#fff;font-family:var(--f-label);font-size:.7rem;font-weight:700;letter-spacing:.08em;padding:.28rem .6rem .28rem .45rem;border-radius:999px}
.card .vid svg{width:14px;height:14px;color:#FF7A3D}
.a-wrap{max-width:860px}
.a-hero h1{font-size:clamp(1.9rem,4.4vw,3rem);margin-block:.5rem .8rem}
.a-by{display:flex;flex-wrap:wrap;gap:.5rem;color:var(--night-muted);font-size:.92rem}
.preview-note{display:inline-block;margin-bottom:1rem;background:#FFC266;color:#3A2400;font-weight:600;font-size:.88rem;border-radius:999px;padding:.3rem .9rem}
.a-media{margin:0 0 1.6rem;border-radius:var(--r);overflow:hidden;box-shadow:0 18px 50px rgba(21,16,74,.16)}
.a-cover img{width:100%;display:block}
.yt{position:relative;display:block;aspect-ratio:16/9;background:#000;border-radius:var(--r);overflow:hidden;max-width:100%}
.yt img{width:100%;height:100%;object-fit:cover;display:block;opacity:.92;transition:opacity .2s}
.yt:hover img{opacity:1}
.yt-play{position:absolute;left:50%;top:50%;width:76px;height:54px;margin:-27px 0 0 -38px;border-radius:16px;background:linear-gradient(145deg,#FF7A2E,#F0401F);box-shadow:0 10px 30px rgba(0,0,0,.35)}
.yt-play::after{content:"";position:absolute;left:31px;top:16px;border-style:solid;border-width:11px 0 11px 18px;border-color:transparent transparent transparent #fff}
.yt iframe{position:absolute;inset:0;width:100%;height:100%;border:0}
.a-lead{font-size:1.18rem;line-height:1.75;color:var(--ink);font-weight:500;margin-bottom:1.4rem;padding-left:1rem;border-left:3px solid var(--brand-2)}
.prose{font-size:1.06rem;line-height:1.9}
.prose p,.prose ul,.prose ol,.prose blockquote,.prose .yt,.prose figure{margin:0 0 1.1rem}
.prose h2{font-size:1.55rem;margin:2rem 0 .8rem}
.prose h3{font-size:1.25rem;margin:1.6rem 0 .6rem}
.prose ul,.prose ol{padding-left:1.4rem}
.prose li{margin-bottom:.35rem}
.prose li::marker{color:var(--brand)}
.prose a{color:var(--signal);text-underline-offset:3px}
.prose blockquote{border-left:3px solid var(--signal);background:var(--signal-soft);padding:.8rem 1.1rem;border-radius:0 12px 12px 0}
.prose strong{font-weight:600}
.a-photo img{width:100%;border-radius:12px;display:block}
.a-zoom{cursor:zoom-in;display:block}
.a-gallery{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:.6rem;margin:1.4rem 0}
.a-gallery img{width:100%;aspect-ratio:4/3;object-fit:cover;border-radius:10px;display:block}
@media (max-width:560px){.a-gallery{grid-template-columns:repeat(2,minmax(0,1fr))}}
.a-foot{display:grid;gap:1rem;margin-top:2rem;padding-top:1.4rem;border-top:1px solid var(--line)}
.share{display:flex;flex-wrap:wrap;gap:.5rem;align-items:center}
.share .lbl{font-family:var(--f-label);font-size:.72rem;letter-spacing:.14em;font-weight:700;color:var(--muted);text-transform:uppercase;margin-right:.3rem}
.btn-sm{padding:.5rem .95rem;font-size:.9rem}