html,body{margin:0}img{max-width:100%}[hidden]{display:none!important}
/* Layout: a full-bleed night-blue hero carrying a route map that ends in Seoul; quiet white sections below, generous whitespace, one celadon accent and one gold line colour reserved for the CN2 route */
:root{
  --bg:#FFFFFF; --soft:#F3F6F6; --ink:#0D1A22; --muted:#5A6A72; --line:#E2E8E9;
  --accent:#1F7A68; --accent-soft:#E3F1EC;
  --night:#0A1620; --night-2:#102230; --night-ink:#EAF2F0; --night-muted:#8EA3A6; --night-line:rgba(234,242,240,.12);
  --celadon:#6CCAB4; --gold:#E2B45C;
  --display:"Manrope","Noto Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  --body:"Noto Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  --mono:"IBM Plex Mono",ui-monospace,Menlo,Consolas,monospace;
  --gutter:clamp(20px,5vw,56px);
}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]){
  --bg:#0B141A; --soft:#101C24; --ink:#E7EFEE; --muted:#93A6AA; --line:#1F2E37;
  --accent:#6CCAB4; --accent-soft:#13302A; color-scheme:dark}}
:root[data-theme="dark"]{
  --bg:#0B141A; --soft:#101C24; --ink:#E7EFEE; --muted:#93A6AA; --line:#1F2E37;
  --accent:#6CCAB4; --accent-soft:#13302A; color-scheme:dark}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
body{background:var(--bg);color:var(--ink);font-family:var(--body);font-size:17px;line-height:1.75;font-weight:400;-webkit-font-smoothing:antialiased;padding-inline:0;padding-block:0}
.wrap{max-width:1200px;margin:0 auto;padding-inline:var(--gutter)}
h1,h2,h3{font-family:var(--display);margin:0;text-wrap:balance;font-weight:700}
p{margin:0}
a{color:inherit}
:focus-visible{outline:2px solid var(--celadon);outline-offset:3px;border-radius:4px}
.label{font-family:var(--mono);font-size:13px;letter-spacing:.14em;text-transform:uppercase;color:var(--accent)}

/* ---------- nav ---------- */
.nav{position:sticky;top:env(safe-area-inset-top,0px);z-index:20;background:rgba(10,22,32,.86);backdrop-filter:saturate(1.4) blur(14px);-webkit-backdrop-filter:saturate(1.4) blur(14px);border-bottom:1px solid var(--night-line);color:var(--night-ink)}
.nav .wrap{display:flex;align-items:center;justify-content:space-between;height:76px;gap:24px}
.brand{display:flex;align-items:center;gap:12px;text-decoration:none;font-family:var(--display);font-weight:800;font-size:22px;letter-spacing:-.01em;color:var(--night-ink)}
.brand .ph{font-family:var(--mono);font-size:11px;font-weight:400;color:var(--night-muted);border:1px solid var(--night-line);border-radius:4px;padding:1px 6px;letter-spacing:0}
.menu{display:flex;align-items:center;gap:40px}
.menu a{text-decoration:none;font-size:17px;font-weight:500;color:var(--night-muted);transition:color .2s}
.menu a:hover{color:var(--night-ink)}
.menu a.btn,.menu a.btn:hover{color:var(--night)}
.mobile a.btn{color:var(--night)}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;border-radius:999px;padding:14px 28px;font-family:var(--body);font-size:17px;font-weight:500;text-decoration:none;border:1px solid transparent;cursor:pointer;transition:transform .2s,background .2s}
.btn:hover{transform:translateY(-1px)}
.btn-light{background:var(--night-ink);color:var(--night)}
.btn-line{border-color:rgba(234,242,240,.35);color:var(--night-ink);background:transparent}
.btn-line:hover{background:rgba(234,242,240,.08)}
.btn-accent{background:var(--accent);color:#fff}
:root[data-theme="dark"] .btn-accent{color:var(--night)}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]) .btn-accent{color:var(--night)}}
.nav .btn{padding:11px 22px;font-size:16px}
.burger{display:none;background:none;border:1px solid var(--night-line);color:var(--night-ink);border-radius:10px;width:48px;height:48px;cursor:pointer}
.mobile{display:none}
@media (max-width:860px){
  .menu{display:none}.burger{display:grid;place-items:center}
  .mobile{display:block;position:fixed;inset:76px 0 0 0;top:calc(76px + env(safe-area-inset-top,0px));background:var(--night);z-index:19;padding:32px var(--gutter)}
  .mobile[hidden]{display:none!important}
  .mobile a{display:block;font-size:26px;font-weight:500;color:var(--night-ink);text-decoration:none;padding:18px 0;border-bottom:1px solid var(--night-line)}
  .mobile .btn{margin-top:32px;width:100%;font-size:18px;border-bottom:0;padding:16px}
}

/* ---------- hero ---------- */
.hero{background:radial-gradient(1200px 600px at 78% 40%,#123044 0%,transparent 60%),var(--night);color:var(--night-ink);overflow:hidden}
.hero .wrap{display:grid;grid-template-columns:1.1fr 1fr;gap:48px;align-items:center;padding-block:120px 112px}
.hero .label{color:var(--celadon)}
.hero h1{font-size:clamp(40px,5.4vw,72px);line-height:1.08;letter-spacing:-.035em;margin-top:24px;font-weight:700}
.hero h1 .k{color:var(--celadon)}
.hero .lead{margin-top:28px;font-size:clamp(17px,1.6vw,20px);font-weight:300;color:#C4D3D3;max-width:30em;line-height:1.8}
.hero .cta{display:flex;flex-wrap:wrap;gap:14px;margin-top:40px}
.map{min-width:0;width:100%}
.map svg{display:block;width:100%;height:auto}
.map text{font-family:var(--body)}
@media (max-width:960px){.hero .wrap{grid-template-columns:1fr;padding-block:72px 64px;gap:40px}}
@media (prefers-reduced-motion:no-preference){
  .flow{stroke-dasharray:6 10;animation:flow 2.2s linear infinite}
  @keyframes flow{to{stroke-dashoffset:-32}}
  .pulse{animation:pulse 2.6s ease-out infinite;transform-origin:center;transform-box:fill-box}
  @keyframes pulse{0%{opacity:.7;transform:scale(1)}100%{opacity:0;transform:scale(3.2)}}
}

/* proof strip */
.strip{background:var(--night-2);color:var(--night-ink);border-top:1px solid var(--night-line)}
.strip .wrap{display:grid;grid-template-columns:repeat(3,1fr);gap:0}
.strip div.item{padding:34px 28px 34px 0;min-width:0}
.strip div.item + div.item{padding-left:28px;border-left:1px solid var(--night-line)}
.strip b{display:block;font-family:var(--display);font-size:20px;font-weight:700}
.strip span{font-size:15px;color:var(--night-muted)}
@media (max-width:760px){.strip .wrap{grid-template-columns:1fr}.strip div.item,.strip div.item + div.item{padding:22px 0;border-left:0;border-top:1px solid var(--night-line)}.strip div.item:first-child{border-top:0}}

/* ---------- sections ---------- */
section.sec{padding-block:clamp(88px,11vw,152px)}
section.alt{background:var(--soft)}
.sec-head{max-width:760px;margin-bottom:clamp(48px,6vw,80px)}
.sec-head h2{font-size:clamp(32px,4.4vw,56px);line-height:1.15;letter-spacing:-.03em;margin-top:18px}
.sec-head p{margin-top:22px;font-size:19px;font-weight:300;color:var(--muted);max-width:36em}

/* seoul pillars */
.pillars{display:grid;grid-template-columns:repeat(3,1fr);gap:clamp(24px,3vw,48px)}
.pillar{min-width:0;border-top:2px solid var(--ink);padding-top:28px}
.pillar .big{font-family:var(--display);font-size:clamp(28px,3vw,40px);font-weight:700;letter-spacing:-.02em;line-height:1.2}
.pillar .big small{display:block;font-family:var(--mono);font-size:13px;font-weight:400;color:var(--accent);letter-spacing:.08em;margin-bottom:12px}
.pillar p{margin-top:18px;color:var(--muted);font-size:16px}
.pillar ul{list-style:none;padding:0;margin:20px 0 0;display:grid;gap:10px;font-size:15px}
.pillar li{display:flex;gap:12px;align-items:baseline}
.pillar li::before{content:"";flex:none;width:6px;height:6px;border-radius:50%;background:var(--accent);transform:translateY(-3px)}
@media (max-width:900px){.pillars{grid-template-columns:1fr;gap:56px}}

/* models */
.models{display:grid;grid-template-columns:repeat(2,1fr);gap:20px}
.model{background:var(--bg);border:1px solid var(--line);border-radius:24px;padding:clamp(28px,3.4vw,44px);display:grid;grid-template-columns:1fr auto;gap:8px 24px;align-items:start;min-width:0;transition:border-color .25s,transform .25s}
.model:hover{border-color:var(--accent);transform:translateY(-2px)}
.model h3{font-size:clamp(34px,3.6vw,48px);letter-spacing:-.03em;font-weight:800;line-height:1}
.model .vendor{font-family:var(--mono);font-size:13px;color:var(--muted);letter-spacing:.06em;align-self:center}
.model p{grid-column:1/-1;margin-top:18px;font-size:17px;color:var(--ink)}
.model .route{grid-column:1/-1;margin-top:22px;padding-top:18px;border-top:1px solid var(--line);font-size:14px;color:var(--muted);display:flex;flex-wrap:wrap;gap:6px 18px}
.model .route b{font-weight:500;color:var(--ink)}
.note{margin-top:28px;font-size:14px;color:var(--muted);max-width:60em}
@media (max-width:760px){.models{grid-template-columns:1fr}}

/* why */
.why{display:grid;grid-template-columns:repeat(3,1fr);gap:1px;background:var(--line);border:1px solid var(--line);border-radius:24px;overflow:hidden}
.why > div{min-width:0;background:var(--bg);padding:clamp(28px,3vw,44px)}
.why svg{color:var(--accent)}
.why h3{font-size:22px;margin-top:22px;letter-spacing:-.01em}
.why p{margin-top:12px;font-size:16px;color:var(--muted)}
@media (max-width:960px){.why{grid-template-columns:1fr 1fr}}
@media (max-width:520px){.why{grid-template-columns:1fr}}

/* contact */
.contact-band{background:var(--night);color:var(--night-ink)}
.contact-band .label{color:var(--celadon)}
.contact-band .sec-head p{color:#B9C9C9}
.contact{display:grid;grid-template-columns:.8fr 1.2fr;gap:clamp(40px,6vw,96px);align-items:start}
.contact aside{display:grid;gap:32px}
.contact aside h3{font-size:18px;font-weight:600}
.contact aside p{margin-top:8px;font-size:16px;color:var(--night-muted)}
.contact aside .mail{font-family:var(--mono);font-size:15px;color:var(--night-ink);user-select:all}
form.lead{background:var(--bg);color:var(--ink);border-radius:28px;padding:clamp(24px,4vw,48px);display:grid;grid-template-columns:1fr 1fr;gap:22px 20px;min-width:0}
.field{display:grid;gap:8px;min-width:0}
.field.full{grid-column:1/-1}
label,.legend{font-size:14px;font-weight:500;color:var(--ink)}
.req{color:var(--accent)}
input,select,textarea{font:inherit;font-size:16px;color:var(--ink);background:var(--soft);border:1px solid transparent;border-radius:12px;padding:14px 16px;width:100%;transition:border-color .2s,background .2s}
input:focus,select:focus,textarea:focus{outline:none;border-color:var(--accent);background:var(--bg)}
textarea{min-height:120px;resize:vertical}
.checks{display:flex;flex-wrap:wrap;gap:10px}
.checks label{display:inline-flex;align-items:center;gap:8px;background:var(--soft);border-radius:999px;padding:10px 18px;font-weight:400;cursor:pointer;font-size:15px}
.checks input{width:18px;height:18px;margin:0;accent-color:var(--accent);padding:0}
.form-foot{grid-column:1/-1;display:flex;align-items:center;gap:18px;flex-wrap:wrap;margin-top:6px}
.status{font-size:15px;color:var(--muted)}
.status.ok{color:var(--accent);font-weight:500}
.status.err{color:#B4561E}
:root[data-theme="dark"] .status.err{color:var(--gold)}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]) .status.err{color:var(--gold)}}
@media (max-width:860px){.contact{grid-template-columns:1fr}form.lead{grid-template-columns:1fr}}

#inbox{margin-top:56px;background:var(--bg);color:var(--ink);border-radius:24px;padding:clamp(20px,3vw,36px)}
#inbox h3{font-size:20px;display:flex;flex-wrap:wrap;gap:12px;align-items:baseline}
#inbox h3 span{font-family:var(--mono);font-size:12px;color:var(--muted);font-weight:400}
.tablewrap{overflow-x:auto;margin-top:16px}
#inbox table{border-collapse:collapse;width:100%;font-size:14px;min-width:760px}
#inbox th,#inbox td{text-align:left;padding:12px;border-bottom:1px solid var(--line);vertical-align:top}
#inbox th{font-size:12px;color:var(--muted);font-weight:500}
#inbox td.t{font-family:var(--mono);font-size:12px;white-space:nowrap;font-variant-numeric:tabular-nums}

footer{background:var(--night);color:var(--night-muted);font-size:14px;border-top:1px solid var(--night-line)}
footer .wrap{display:flex;justify-content:space-between;flex-wrap:wrap;gap:16px;padding-block:36px 48px}
@media (max-width:600px){
  body{font-size:17px}
  .pillar p,.why p,.strip span,.model .route{font-size:16px}
  .model p{font-size:17px}
  .sec-head p{font-size:17px}
  .label{font-size:13px}
}

/* multi-page additions */
.brand .mark{display:grid;place-items:center;width:34px;height:34px;border-radius:9px;background:linear-gradient(135deg,#6CCAB4,#2E8C7A);color:#0A1620;font-family:var(--display);font-weight:800;font-size:15px;letter-spacing:-.02em}
.brand .word b{font-weight:800}.brand .word span{font-weight:500;color:var(--night-muted);margin-left:6px}
.menu a[aria-current="page"]:not(.btn){color:var(--night-ink);box-shadow:inset 0 -2px 0 var(--celadon);padding-bottom:6px}
.mobile a[aria-current="page"]:not(.btn){color:var(--celadon)}
.page-hero{background:radial-gradient(900px 420px at 85% 0%,#123044 0%,transparent 60%),var(--night);color:var(--night-ink)}
.page-hero .wrap{padding-block:clamp(72px,9vw,128px) clamp(56px,7vw,96px)}
.page-hero .label{color:var(--celadon)}
.page-hero h1{font-size:clamp(36px,5vw,64px);line-height:1.12;letter-spacing:-.03em;margin-top:20px;max-width:16em}
.page-hero p.lead{margin-top:24px;font-size:clamp(17px,1.5vw,20px);font-weight:300;color:#C4D3D3;max-width:34em}
.crumb{font-size:14px;color:var(--night-muted);margin-bottom:28px}.crumb a{color:var(--night-muted);text-decoration:none}.crumb a:hover{color:var(--night-ink)}
section.sec.first{padding-top:clamp(64px,8vw,112px)}
.explore{display:grid;grid-template-columns:repeat(2,1fr);gap:20px}
.card{display:flex;flex-direction:column;gap:14px;min-width:0;text-decoration:none;background:var(--bg);border:1px solid var(--line);border-radius:24px;padding:clamp(28px,3.4vw,44px);transition:border-color .25s,transform .25s}
.card:hover{border-color:var(--accent);transform:translateY(-3px)}
.card .k{font-family:var(--mono);font-size:13px;letter-spacing:.12em;color:var(--accent)}
.card h3{font-size:clamp(26px,2.6vw,34px);letter-spacing:-.02em}
.card p{color:var(--muted);font-size:16px}
.card .go{margin-top:auto;padding-top:12px;font-weight:500;color:var(--ink);display:flex;align-items:center;gap:8px}
.card .go svg{transition:transform .25s}.card:hover .go svg{transform:translateX(4px)}
@media (max-width:760px){.explore{grid-template-columns:1fr}}
.next{background:var(--soft);border-top:1px solid var(--line)}
.next .wrap{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:24px;padding-block:56px}
.next h2{font-size:clamp(24px,2.6vw,32px);letter-spacing:-.02em}
.next p{color:var(--muted);margin-top:8px}
.footer-links{display:flex;flex-wrap:wrap;gap:20px}.footer-links a{color:var(--night-muted);text-decoration:none}.footer-links a:hover{color:var(--night-ink)}