:root{
  --navy:#0b1f3a; --navy-2:#102a4c; --ink:#0f172a; --text:#334155; --muted:#64748b;
  --line:#e2e8f0; --bg:#ffffff; --bg-alt:#f5f8fc; --accent:#0ea5e9; --accent-2:#38bdf8;
  --radius:16px; --shadow:0 10px 30px -12px rgba(15,23,42,.18);
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;scroll-padding-top:72px}
body{font-family:"Pretendard Variable",Pretendard,-apple-system,BlinkMacSystemFont,"Apple SD Gothic Neo","Malgun Gothic","Noto Sans KR",sans-serif;color:var(--text);background:var(--bg);line-height:1.7;word-break:keep-all;-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
ul,ol{list-style:none}
.container{width:min(1120px,100% - 40px);margin-inline:auto}

/* NAV */
.nav{position:sticky;top:0;z-index:50;background:rgba(11,31,58,.86);backdrop-filter:saturate(160%) blur(12px);-webkit-backdrop-filter:saturate(160%) blur(12px);border-bottom:1px solid rgba(255,255,255,.08)}
.nav-inner{display:flex;align-items:center;justify-content:space-between;height:64px}
.brand{display:inline-flex;align-items:center;gap:10px;color:#fff;font-weight:700;font-size:1.2rem;letter-spacing:.02em}
.brand-mark{display:grid;place-items:center;width:32px;height:32px;border-radius:9px;background:linear-gradient(135deg,var(--accent),#2563eb);color:#fff;font-size:1rem;font-weight:800}
.nav-links{display:flex;gap:28px;align-items:center}
.nav-links a{color:rgba(255,255,255,.78);font-size:.95rem;font-weight:500;transition:color .2s}
.nav-links a:hover{color:#fff}
.nav-cta{padding:8px 16px;border-radius:999px;background:rgba(56,189,248,.15);color:#e0f2fe!important;border:1px solid rgba(56,189,248,.35)}

/* HERO */
.hero{position:relative;overflow:hidden;background-color:var(--navy);background-image:radial-gradient(1200px 500px at 80% -10%,rgba(56,189,248,.22),transparent 60%),radial-gradient(900px 500px at -10% 110%,rgba(37,99,235,.30),transparent 60%),linear-gradient(180deg,rgba(11,31,58,.86) 0%,rgba(11,31,58,.74) 45%,rgba(16,42,76,.95) 100%),url("hero-rail.jpg");background-size:auto,auto,auto,cover;background-position:center,center,center,center 58%;background-repeat:no-repeat;color:#fff;padding:120px 0 130px}
.hero::before{content:"";position:absolute;inset:0;background:radial-gradient(ellipse 60% 55% at 50% 48%,rgba(11,31,58,.55),transparent 75%);pointer-events:none}
.hero .rails{opacity:.6}
.hero-tagline,.hero-sub{text-shadow:0 1px 12px rgba(5,15,30,.6)}
.hero-bg{position:absolute;inset:0;pointer-events:none}
.rails{position:absolute;left:0;right:0;bottom:0;width:100%;height:60%}
.hero-inner{position:relative;text-align:center}
.eyebrow{display:inline-block;font-size:.8rem;letter-spacing:.18em;text-transform:uppercase;color:var(--accent-2);padding:6px 14px;border:1px solid rgba(56,189,248,.35);border-radius:999px;margin-bottom:24px}
.hero-title{font-size:clamp(3.5rem,10vw,6.5rem);line-height:1;font-weight:800;letter-spacing:-.03em;background:linear-gradient(180deg,#fff,#bae6fd);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero-tagline{margin-top:22px;font-size:clamp(1.15rem,2.6vw,1.6rem);font-weight:600;color:#e2e8f0;line-height:1.5}
.hero-sub{margin:18px auto 0;max-width:680px;color:rgba(226,232,240,.85);font-size:1.02rem}
.hero-actions{margin-top:36px;display:flex;gap:12px;justify-content:center;flex-wrap:wrap}
.btn{display:inline-flex;align-items:center;justify-content:center;padding:13px 26px;border-radius:12px;font-weight:600;font-size:1rem;transition:transform .15s,box-shadow .2s,background .2s}
.btn:hover{transform:translateY(-1px)}
.btn-primary{background:linear-gradient(135deg,var(--accent),#2563eb);color:#fff;box-shadow:0 10px 24px -10px rgba(14,165,233,.8)}
.btn-ghost{border:1px solid rgba(255,255,255,.25);color:#fff}
.btn-ghost:hover{background:rgba(255,255,255,.08)}
.btn-block{width:100%;margin-top:8px}
.br-sm{display:none}

/* SECTIONS */
.section{padding:100px 0}
.section-alt{background:var(--bg-alt)}
.section-label{font-size:.85rem;font-weight:700;color:var(--accent);letter-spacing:.08em;margin-bottom:10px}
.section-title{font-size:clamp(1.6rem,3.4vw,2.3rem);line-height:1.35;color:var(--ink);font-weight:750;letter-spacing:-.02em;margin-bottom:22px}
.center{text-align:center}
.lead{font-size:1.08rem;color:var(--text);margin-bottom:14px}
.muted{color:var(--muted)}
.two-col{display:grid;grid-template-columns:1.1fr 1fr;gap:56px;align-items:center}

.connect-card{background:linear-gradient(180deg,#fff,#f8fbff);border:1px solid var(--line);border-radius:22px;padding:28px;box-shadow:var(--shadow);display:flex;flex-direction:column;align-items:center}
.hub{width:100%;text-align:center;padding:16px;border-radius:14px;border:1px solid var(--line);background:#fff;display:flex;flex-direction:column;align-items:center;gap:2px;position:relative}
.hub strong{color:var(--ink)} .hub small{color:var(--muted)}
.hub-dot{width:10px;height:10px;border-radius:50%;background:#22c55e;box-shadow:0 0 0 5px rgba(34,197,94,.15);margin-bottom:6px}
.hub.mcp{background:var(--navy);border-color:var(--navy)} .hub.mcp strong{color:#fff} .hub.mcp small{color:#93c5fd}
.hub-line{width:2px;height:26px;background:linear-gradient(var(--accent),#2563eb)}
.sources{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;width:100%;margin-top:18px;position:relative}
.sources::before{content:"";position:absolute;top:-18px;left:16%;right:16%;height:18px;border:2px solid #93c5fd;border-bottom:none;border-radius:10px 10px 0 0}
.source{font-size:.88rem;text-align:center;padding:14px 8px;background:var(--bg-alt);border:1px solid var(--line);border-radius:12px;color:var(--ink);font-weight:600;display:flex;flex-direction:column;align-items:center;gap:6px}
.ico{font-size:1.3rem}

/* FEATURES */
.grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;margin-top:40px}
.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:28px 24px;transition:transform .2s,box-shadow .2s,border-color .2s}
.card:hover{transform:translateY(-4px);box-shadow:var(--shadow);border-color:#bae6fd}
.card-icon{width:48px;height:48px;border-radius:12px;background:linear-gradient(135deg,#e0f2fe,#dbeafe);display:grid;place-items:center;margin-bottom:18px}
.card-icon svg{width:24px;height:24px;fill:none;stroke:#0369a1;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}
.card h3{font-size:1.1rem;color:var(--ink);margin-bottom:8px;font-weight:700}
.card p{font-size:.95rem;color:var(--muted)}

/* STEPS */
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;margin-top:40px;counter-reset:s}
.step{position:relative;padding:28px 24px;border-radius:var(--radius);background:var(--bg-alt);border:1px solid var(--line)}
.step:not(:last-child)::after{content:"";position:absolute;top:44px;right:-16px;width:12px;height:12px;border-top:2px solid #93c5fd;border-right:2px solid #93c5fd;transform:rotate(45deg)}
.step-num{display:inline-block;font-weight:800;font-size:.95rem;color:#fff;background:var(--navy);padding:4px 10px;border-radius:8px;margin-bottom:14px;letter-spacing:.05em}
.step h3{font-size:1.08rem;color:var(--ink);margin-bottom:6px}
.step p{font-size:.94rem;color:var(--muted)}

/* CONTACT */
.contact{background:linear-gradient(135deg,var(--navy),#123764);color:#fff}
.contact-inner{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:center}
.light{color:#fff} .section-label.light{color:var(--accent-2)}
.contact-text{color:rgba(226,232,240,.8);font-size:1.05rem}
.contact-card{background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.14);border-radius:20px;padding:28px;backdrop-filter:blur(6px)}
.contact-row{display:flex;flex-direction:column;gap:4px;padding:14px 0;border-bottom:1px solid rgba(255,255,255,.1)}
.contact-row:last-of-type{border-bottom:none;margin-bottom:10px}
.contact-label{font-size:.82rem;color:#93c5fd;font-weight:600;letter-spacing:.04em}
.contact-value{font-size:1.1rem;font-weight:600;color:#fff;font-style:normal;word-break:break-all}
a.contact-value:hover{color:var(--accent-2);text-decoration:underline;text-underline-offset:4px}

/* FOOTER */
.footer{background:#08172c;color:rgba(226,232,240,.6);padding:28px 0;font-size:.88rem}
.footer-inner{display:flex;justify-content:space-between;align-items:center;gap:12px;flex-wrap:wrap}
.photo-credit{flex-basis:100%;font-size:.75rem;color:rgba(226,232,240,.45)}
.photo-credit a{color:inherit;text-decoration:underline;text-underline-offset:2px}
.photo-credit a:hover{color:rgba(226,232,240,.8)}
.brand.small{font-size:1rem} .brand.small .brand-mark{width:26px;height:26px;font-size:.85rem;border-radius:7px}

/* RESPONSIVE */
@media (max-width:960px){
  .grid,.steps{grid-template-columns:repeat(2,1fr)}
  .step:nth-child(2)::after{display:none}
  .two-col,.contact-inner{grid-template-columns:1fr;gap:36px}
}
@media (max-width:640px){
  .nav-links li:not(:last-child){display:none}
  .hero{padding:88px 0 96px;background-position:center,center,center,62% 58%}
  .section{padding:72px 0}
  .grid,.steps{grid-template-columns:1fr}
  .step::after{display:none}
  .br-sm{display:inline} .br-lg{display:none}
  .sources{grid-template-columns:1fr}
  .sources::before{display:none}
}
@media (prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}