/* Layout: dark ultramarine hero with a live fiber-tree diagram (OLT > splitter > floor > ONU), then light sections: service explorer, network anatomy, building types, install steps, quote form. */
:root{
  --font-display:"Prompt","IBM Plex Sans Thai",system-ui,sans-serif;
  --font-body:"IBM Plex Sans Thai","Noto Sans Thai",system-ui,sans-serif;
  --bg:#f4f6fb; --surface:#ffffff; --surface2:#eaeff9; --text:#13203d; --muted:#56637f; --line:#d9e0ee;
  --accent:#1a4fd6; --accent-ink:#ffffff; --signal:#ff8a1f;
  --hero-bg:#081d52; --hero-text:#f2f6ff; --hero-muted:#a9b8e0; --hero-line:rgba(255,255,255,.22); --pulse:#ffb22e;
  --radius:14px;
}
@media (prefers-color-scheme: dark){:root:not([data-theme="light"]){
  --bg:#0a1226; --surface:#121c38; --surface2:#18244a; --text:#e8eefb; --muted:#9aa8c7; --line:#243260;
  --accent:#7aa0ff; --accent-ink:#0a1226; --signal:#ffb22e; --hero-bg:#050f2e; color-scheme:dark}}
:root[data-theme="dark"]{
  --bg:#0a1226; --surface:#121c38; --surface2:#18244a; --text:#e8eefb; --muted:#9aa8c7; --line:#243260;
  --accent:#7aa0ff; --accent-ink:#0a1226; --signal:#ffb22e; --hero-bg:#050f2e; color-scheme:dark}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{background:var(--bg);color:var(--text);font-family:var(--font-body);font-size:16px;line-height:1.7;margin:0}
h1,h2,h3{font-family:var(--font-display);line-height:1.25;margin:0;text-wrap:balance}
p{margin:0}
a{color:inherit}
:focus-visible{outline:3px solid var(--signal);outline-offset:2px}
.wrap{max-width:1160px;margin-inline:auto;padding-left:max(16px,env(safe-area-inset-left,0px));padding-right:max(16px,env(safe-area-inset-right,0px))}
.btn{display:inline-flex;align-items:center;gap:8px;font:600 16px var(--font-body);padding:12px 22px;border-radius:999px;border:2px solid transparent;text-decoration:none;cursor:pointer;min-height:46px}
.btn.primary{background:var(--signal);color:#1b1100}
.btn.ghost{border-color:var(--hero-line);color:var(--hero-text)}
.btn.solid{background:var(--accent);color:var(--accent-ink)}
.btn:hover{filter:brightness(1.08)}

/* header */
header.top{position:sticky;top:env(safe-area-inset-top,0px);z-index:20;background:var(--hero-bg);color:var(--hero-text);border-bottom:1px solid var(--hero-line)}
body::before{content:"";position:fixed;inset:0 0 auto;height:env(safe-area-inset-top,0px);z-index:30;background:var(--hero-bg)}
.top .wrap{display:flex;align-items:center;gap:20px;padding-block:10px}
.logo{display:flex;align-items:center;gap:10px;font:700 20px var(--font-display);text-decoration:none;white-space:nowrap}
.logo svg{width:34px;height:34px}
.top nav{display:flex;gap:4px;margin-left:auto;overflow-x:auto;scrollbar-width:none}
.top nav a{padding:8px 12px;border-radius:8px;text-decoration:none;font-size:15px;color:var(--hero-muted);white-space:nowrap}
.top nav a:hover{color:var(--hero-text);background:rgba(255,255,255,.08)}
.theme{background:none;border:1px solid var(--hero-line);color:var(--hero-text);border-radius:999px;width:40px;height:40px;cursor:pointer;font-size:16px;flex:none}
@media(max-width:820px){.top nav{display:none}.theme{margin-left:auto}}

/* hero */
.hero{background:var(--hero-bg);color:var(--hero-text);overflow:hidden}
.hero .wrap{display:grid;grid-template-columns:minmax(0,5fr) minmax(0,6fr);gap:32px;align-items:center;padding-block:56px 48px}
.hero h1{font-size:clamp(32px,5vw,56px);font-weight:700;letter-spacing:-.01em}
.hero p.lead{color:var(--hero-muted);font-size:18px;margin-top:18px;max-width:34em}
.hero .cta{display:flex;flex-wrap:wrap;gap:12px;margin-top:28px}
.facts{display:flex;flex-wrap:wrap;gap:12px 28px;margin-top:34px;padding:0;list-style:none}
.facts li{font-size:14px;color:var(--hero-muted);min-width:0}
.facts b{display:block;font:600 22px var(--font-display);color:var(--hero-text)}
.diagram{position:relative;min-width:0}
#fiber{width:100%;height:380px;display:block}
.diagram figcaption{font-size:13px;color:var(--hero-muted);margin-top:4px}
@media(max-width:860px){.hero .wrap{grid-template-columns:1fr;padding-block:36px}#fiber{height:320px}}

/* sections */
section.s{padding-block:76px}
section.s.alt{background:var(--surface2)}
.head{max-width:44em;margin-bottom:36px}
.head h2{font-size:clamp(26px,3.6vw,38px)}
.head p{color:var(--muted);margin-top:12px;font-size:17px}

/* explorer */
.explorer{display:grid;grid-template-columns:minmax(0,260px) minmax(0,1fr);gap:24px;align-items:start}
.tabs{display:flex;flex-direction:column;gap:6px}
.tabs button{display:flex;align-items:center;gap:12px;text-align:left;font:500 16px var(--font-body);color:var(--text);background:transparent;border:1px solid var(--line);border-radius:12px;padding:12px 14px;cursor:pointer;min-height:52px}
.tabs button svg{width:26px;height:26px;flex:none;stroke:var(--accent);fill:none;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round}
.tabs button[aria-selected="true"]{background:var(--accent);color:var(--accent-ink);border-color:var(--accent)}
.tabs button[aria-selected="true"] svg{stroke:var(--accent-ink)}
.panel{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:30px;min-width:0}
.panel h3{font-size:26px}
.panel .tag{color:var(--signal);font-weight:600;margin-bottom:6px;font-size:15px}
.panel .desc{color:var(--muted);margin-top:10px;max-width:42em}
.cols{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:24px;margin-top:24px}
.cols h4{font:600 16px var(--font-display);margin:0 0 8px}
.cols ul{margin:0;padding-left:20px;color:var(--text)}
.cols li{margin-bottom:5px}
.chips{display:flex;flex-wrap:wrap;gap:8px;margin-top:8px}
.chips span{background:var(--surface2);border:1px solid var(--line);border-radius:8px;padding:3px 11px;font-size:14px}
@media(max-width:820px){
 .explorer{grid-template-columns:1fr}
 .tabs{flex-direction:row;overflow-x:auto;padding-bottom:6px}
 .tabs button{flex:none;white-space:nowrap}
 .cols{grid-template-columns:1fr}.panel{padding:22px}}

/* anatomy */
.anatomy{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:28px;align-items:start}
.bldg{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:18px;min-width:0}
.bldg svg{width:100%;height:auto;display:block}
.bldg text{font-family:var(--font-body);fill:var(--text);font-size:13px}
.roles{display:flex;flex-direction:column;gap:18px}
.role{display:grid;grid-template-columns:44px minmax(0,1fr);gap:14px}
.role i{width:44px;height:44px;border-radius:12px;background:var(--accent);color:var(--accent-ink);display:grid;place-items:center;font:700 13px var(--font-display);font-style:normal}
.role h3{font-size:18px}
.role p{color:var(--muted);font-size:15px;margin-top:2px}
.tablewrap{overflow-x:auto;margin-top:32px;border:1px solid var(--line);border-radius:var(--radius);background:var(--surface)}
table{border-collapse:collapse;width:100%;min-width:560px}
th,td{padding:13px 16px;text-align:left;border-bottom:1px solid var(--line);font-size:15px;vertical-align:top}
th{font-family:var(--font-display);font-weight:600;background:var(--surface2)}
tr:last-child td{border-bottom:0}
td:first-child{font-weight:600}
@media(max-width:820px){.anatomy{grid-template-columns:1fr}}

/* building types */
.types{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:24px}
.type{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;min-width:0;display:flex;flex-direction:column}
.type .tbody{padding:22px 24px 24px;display:flex;flex-direction:column;flex:1}
.type h3{font-size:21px;margin-bottom:6px}
.type p{color:var(--muted);font-size:15.5px}
.type .stack{display:flex;flex-wrap:wrap;gap:6px;margin-top:auto;padding-top:16px}
.type .stack span{font-size:13px;background:var(--surface2);border-radius:6px;padding:2px 9px}
@media(max-width:640px){.types{grid-template-columns:1fr;gap:18px}}

/* steps */
.steps{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(var(--n,5),minmax(0,1fr));gap:0;counter-reset:s}
.steps li{position:relative;padding:44px 14px 0 0;counter-increment:s;min-width:0}
.steps li::before{content:counter(s);position:absolute;top:0;left:0;width:32px;height:32px;border-radius:50%;background:var(--accent);color:var(--accent-ink);display:grid;place-items:center;font:600 15px var(--font-display);z-index:1}
.steps li::after{content:"";position:absolute;top:15px;left:32px;right:0;height:2px;background:var(--line)}
.steps li:last-child::after{display:none}
.steps h3{font-size:17px}
.steps p{color:var(--muted);font-size:14.5px;margin-top:4px}
@media(max-width:820px){
 .steps{grid-template-columns:1fr;gap:20px}
 .steps li{padding:0 0 0 48px}
 .steps li::after{top:32px;bottom:-20px;left:15px;right:auto;width:2px;height:auto}}

/* quote */
.quote{display:grid;grid-template-columns:minmax(0,5fr) minmax(0,6fr);gap:32px;align-items:start}
.contact{display:flex;flex-direction:column;gap:14px;margin-top:22px}
.contact div{display:grid;grid-template-columns:90px minmax(0,1fr);gap:8px;font-size:16px}
.contact dt{color:var(--muted)}
.contact dd{margin:0;user-select:all;overflow-wrap:anywhere}
.note{font-size:13px;color:var(--muted);margin-top:14px}
form{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:26px;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px;min-width:0}
form .full{grid-column:1/-1}
label{display:flex;flex-direction:column;gap:5px;font-size:14px;font-weight:500;min-width:0}
input,select,textarea{font:16px var(--font-body);padding:11px 12px;border-radius:10px;border:1px solid var(--line);background:var(--bg);color:var(--text);width:100%;min-width:0}
fieldset{border:0;padding:0;margin:0;min-width:0}
legend{font-size:14px;font-weight:500;margin-bottom:8px;padding:0}
.checks{display:flex;flex-wrap:wrap;gap:8px}
.checks label{flex-direction:row;align-items:center;gap:6px;border:1px solid var(--line);border-radius:999px;padding:6px 13px;font-weight:400;cursor:pointer;background:var(--bg)}
.checks input{width:auto}
.checks label:has(input:checked){background:var(--accent);color:var(--accent-ink);border-color:var(--accent)}
#result{grid-column:1/-1;background:var(--surface2);border-radius:10px;padding:16px;font-size:15px;white-space:pre-wrap}
@media(max-width:860px){.quote{grid-template-columns:1fr}form{grid-template-columns:1fr;padding:20px}}

footer{background:var(--hero-bg);color:var(--hero-muted);padding-block:34px;font-size:14px}
footer .wrap{display:flex;flex-wrap:wrap;justify-content:space-between;gap:12px}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}

/* ---- เพิ่มสำหรับเวอร์ชันมีหลังบ้าน ---- */
.logo img{height:36px;width:auto;display:block}
.pimg{width:100%;max-height:300px;object-fit:cover;border-radius:10px;margin-bottom:20px;display:block}
.eqh{font:600 16px var(--font-display);margin:22px 0 0}
.hero-img{width:100%;max-height:440px;object-fit:cover;border-radius:18px;display:block}
.type .tmedia{aspect-ratio:16/9;overflow:hidden;background:var(--surface2)}
.type .tmedia img{width:100%;height:100%;object-fit:cover;display:block;transition:transform .5s ease}
.type:hover .tmedia img{transform:scale(1.04)}
@media(prefers-reduced-motion:reduce){.type .tmedia img{transition:none}.type:hover .tmedia img{transform:none}}
.gallery{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}
.gallery figure{margin:0;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;min-width:0}
.gallery img{width:100%;aspect-ratio:4/3;object-fit:cover;display:block}
.gallery figcaption{padding:12px 16px}
.gallery figcaption b{display:block;font-family:var(--font-display);font-weight:600}
.gallery figcaption span{color:var(--muted);font-size:14px}
@media(max-width:820px){.gallery{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:520px){.gallery{grid-template-columns:1fr}}
.hp{position:absolute;left:-9999px;width:1px;height:1px;overflow:hidden}
#result.okmsg{background:#d9f5e3;color:#0b4a22}
#result.errmsg{background:#fde0dc;color:#7a1608}
:root[data-theme="dark"] #result.okmsg{background:#12402a;color:#bff0d1}
:root[data-theme="dark"] #result.errmsg{background:#4a1a14;color:#ffd0c9}
@media (prefers-color-scheme: dark){:root:not([data-theme="light"]) #result.okmsg{background:#12402a;color:#bff0d1}:root:not([data-theme="light"]) #result.errmsg{background:#4a1a14;color:#ffd0c9}}
.contact dd a{text-decoration:underline}

/* ---- ส่วนระบบ NOC ---- */
.nocgrid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:24px}
.noc{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;display:flex;flex-direction:column;min-width:0}
.nocshot{position:relative;display:block;width:100%;aspect-ratio:16/9;padding:0;border:0;background:var(--hero-bg);cursor:zoom-in;overflow:hidden}
.nocshot img{width:100%;height:100%;object-fit:cover;display:block;transition:transform .5s ease}
.nocshot:hover img{transform:scale(1.03)}
.nocshot span{position:absolute;right:12px;bottom:12px;background:rgba(5,15,46,.78);color:#fff;font-size:13px;padding:4px 12px;border-radius:999px;opacity:0;transition:opacity .2s}
.nocshot:hover span,.nocshot:focus-visible span{opacity:1}
.nocbody{padding:20px 24px 24px}
.nocbody h3{font-size:20px;margin-bottom:6px}
.nocbody p{color:var(--muted);font-size:15.5px}
.nocbody ul{margin:14px 0 0;padding-left:20px;font-size:15px}
.nocbody li{margin-bottom:4px}
.nocnote{margin-top:18px;color:var(--muted);font-size:14px}
@media(max-width:760px){.nocgrid{grid-template-columns:1fr}.nocshot span{opacity:1}}
@media(prefers-reduced-motion:reduce){.nocshot img{transition:none}.nocshot:hover img{transform:none}}
dialog#lightbox{border:0;padding:0;background:transparent;max-width:min(96vw,1600px);max-height:92vh;overflow:visible}
dialog#lightbox::backdrop{background:rgba(3,10,30,.88)}
#lbImg{display:block;max-width:96vw;max-height:88vh;border-radius:12px;margin:auto}
#lbClose{position:absolute;top:-14px;right:-6px;width:40px;height:40px;border-radius:50%;border:0;background:var(--signal);color:#1b1100;font-size:18px;cursor:pointer;z-index:2}

@media(min-width:761px){
 .noc:last-child:nth-child(odd){grid-column:1/-1;flex-direction:row}
 .noc:last-child:nth-child(odd) .nocshot{width:55%;aspect-ratio:auto;min-height:100%}
 .noc:last-child:nth-child(odd) .nocbody{flex:1;align-self:center;padding:28px 32px}
}

/* ---- hero แบบรูปกว้าง ---- */
.hero-wide{overflow:visible;position:relative;z-index:1}
.hero-wide .wrap{display:block;padding-block:48px 40px}
.hero-wide .htop{display:grid;grid-template-columns:minmax(0,6fr) minmax(0,5fr);gap:20px 48px;align-items:end}
.hero-wide h1{font-size:clamp(30px,4.2vw,50px)}
.hero-wide .hside .lead{margin-top:0;font-size:17px}
.hero-wide .hside .cta{margin-top:20px}
.hero-wide .facts{margin-top:28px}
.widefig{margin:32px 0 0}
.widefig img{display:block;width:100%;height:auto;border-radius:18px;border:1px solid rgba(255,255,255,.28);box-shadow:0 24px 60px rgba(0,0,0,.4);cursor:zoom-in;background:#0b2566}
.widefig figcaption{margin-top:12px;text-align:right;color:var(--hero-muted);font-size:13px}
@media(max-width:860px){
 .hero-wide .wrap{padding-block:32px 28px}
 .hero-wide .htop{grid-template-columns:1fr}
 .widefig{margin-top:24px}}