:root{
  --blue:#14506e; --blue-deep:#0d3a51; --teal:#17897a; --teal-ink:#0f6b5f; --teal-soft:#d9ece8;
  --ink:#14202a; --ink-2:#44525c; --paper:#f6f4ef; --paper-2:#ecE8df; --line:#d9d3c7; --white:#fff;
  --r:14px; --ease:cubic-bezier(.2,.8,.2,1);
  --wrap:min(1120px, calc(100% - 32px));
}
*{box-sizing:border-box;margin:0;padding:0}
html{-webkit-text-size-adjust:100%}
body{font-family:"Pretendard Variable",Pretendard,-apple-system,"Apple SD Gothic Neo","Malgun Gothic",sans-serif;background:var(--paper);color:var(--ink);line-height:1.6;word-break:keep-all;overflow-wrap:break-word;-webkit-font-smoothing:antialiased}
a{color:inherit}
img{display:block;max-width:100%;height:auto}
.wrap{width:var(--wrap);margin-inline:auto}
:focus-visible{outline:3px solid var(--teal);outline-offset:3px;border-radius:6px}

/* header */
.top{position:sticky;top:0;z-index:10;background:color-mix(in srgb,var(--paper) 88%,transparent);backdrop-filter:saturate(1.4) blur(10px);border-bottom:1px solid transparent;transition:border-color .3s}
.top.scrolled{border-bottom-color:var(--line)}
.top .wrap{display:flex;align-items:center;justify-content:space-between;gap:16px;height:68px}
.top img{width:132px}
.top .tel{font-weight:600;font-size:15px;text-decoration:none;color:var(--blue);display:flex;gap:8px;align-items:center;padding:8px 14px;border-radius:999px;transition:background .2s}
.top .tel:hover{background:var(--teal-soft)}

/* hero */
.hero{position:relative;padding:72px 0 88px;overflow:hidden}
.hero .wrap{display:grid;grid-template-columns:1.25fr .75fr;gap:48px;align-items:center}
.kicker{display:inline-flex;gap:10px;align-items:center;font-size:13px;font-weight:600;letter-spacing:.06em;text-transform:uppercase;color:var(--teal-ink)}
h1.kicker{margin:0;line-height:1.6}
.kicker::before{content:"";width:28px;height:2px;background:var(--teal-ink)}
h1,.display{font-size:clamp(34px,5.6vw,68px);line-height:1.12;letter-spacing:-.035em;font-weight:800;margin:20px 0 24px}
h1 em,.display em{font-style:normal;color:var(--blue);background:linear-gradient(transparent 68%,var(--teal-soft) 68%)}
.lede{font-size:clamp(16px,1.6vw,19px);color:var(--ink-2);max-width:34em}
.cta{display:flex;flex-wrap:wrap;gap:12px;margin-top:36px}
.btn{display:inline-flex;align-items:center;gap:10px;padding:16px 26px;border-radius:12px;font-weight:700;font-size:16px;text-decoration:none;transition:transform .25s var(--ease),box-shadow .25s var(--ease),background .2s}
.btn-primary{background:var(--blue);color:var(--white);box-shadow:0 1px 0 var(--blue-deep),0 10px 24px -12px rgba(20,80,110,.7)}
.btn-primary:hover{transform:translateY(-2px);background:var(--blue-deep);box-shadow:0 1px 0 var(--blue-deep),0 16px 30px -12px rgba(20,80,110,.8)}
.btn-primary:active{transform:translateY(0)}
.btn-ghost{border:1.5px solid var(--ink);color:var(--ink)}
.btn-ghost:hover{background:var(--ink);color:var(--paper)}
.btn svg{width:18px;height:18px;flex:none}

/* hex cluster */
.hexes{position:relative;aspect-ratio:1/1.08;max-width:380px;justify-self:end;width:100%}
.hex{position:absolute;width:38%;aspect-ratio:1/1.1547;clip-path:polygon(50% 0,100% 25%,100% 75%,50% 100%,0 75%,0 25%);display:grid;place-items:center;font-weight:800;font-size:clamp(22px,3vw,34px);letter-spacing:-.02em;color:var(--white);animation:rise .9s var(--ease) both}
.hex span{display:block;font-size:11px;font-weight:500;letter-spacing:.04em;text-align:center;margin-top:-6px}
.h1{left:31%;top:0;background:var(--blue)}
.h2{left:0;top:26%;background:var(--teal-ink);animation-delay:.08s}
.h3{left:62%;top:26%;background:#1d6a8c;animation-delay:.16s}
.h4{left:0;top:59%;background:#1d6a8c;animation-delay:.24s}
.h5{left:62%;top:59%;background:var(--blue-deep);animation-delay:.32s}
.hc{left:31%;top:43%;background:var(--paper-2);color:var(--blue);font-size:15px;line-height:1.2;text-align:center;animation-delay:.4s}
@keyframes rise{from{opacity:0;transform:translateY(14px) scale(.96)}to{opacity:1;transform:none}}

/* sections */
section{padding:96px 0}
.label{font-size:13px;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--teal-ink);margin-bottom:14px}
h2{font-size:clamp(26px,3.4vw,42px);line-height:1.2;letter-spacing:-.03em;font-weight:800}
.sec-head{display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:end;margin-bottom:48px}
.sec-head p{color:var(--ink-2);font-size:17px}

/* about */
.about{background:var(--white);border-block:1px solid var(--line)}
.points{display:grid;grid-template-columns:repeat(3,1fr);border-top:2px solid var(--ink)}
.point{padding:28px 28px 8px 0}
.point + .point{padding-left:28px;border-left:1px solid var(--line)}
.point h3::before{content:"";display:block;width:14px;height:16px;margin-bottom:14px;background:var(--teal);clip-path:polygon(50% 0,100% 25%,100% 75%,50% 100%,0 75%,0 25%)}
.point h3{font-size:21px;letter-spacing:-.02em;margin-bottom:8px}
.point p{color:var(--ink-2);font-size:15.5px}

/* subjects */
.subjects{display:grid;grid-template-columns:repeat(5,1fr);gap:14px}
.subj{background:var(--white);border:1px solid var(--line);border-radius:var(--r);padding:22px 20px 24px;transition:transform .3s var(--ease),border-color .3s,box-shadow .3s}
.subj:hover{transform:translateY(-4px);border-color:var(--teal);box-shadow:0 18px 30px -22px rgba(20,32,42,.45)}
.code{width:52px;height:52px;border-radius:10px;display:grid;place-items:center;font-weight:800;font-size:21px;color:var(--white);background:var(--blue);margin-bottom:22px}
.subj:nth-child(2n) .code{background:var(--teal)}
.subj h3{font-size:18px;letter-spacing:-.01em}
.subj p{font-size:14.5px;color:var(--ink-2);margin-top:6px}

/* specialist */
.spec{margin-top:18px;display:grid;grid-template-columns:auto 1fr;gap:36px;align-items:center;background:var(--ink);color:var(--paper);border-radius:calc(var(--r) + 6px);padding:40px 44px}
.formula{display:flex;align-items:center;gap:10px;font-weight:800;font-size:22px}
.formula i{font-style:normal;color:#7fb9b0;font-weight:500}
.formula .c{width:54px;height:54px;border-radius:10px;display:grid;place-items:center;background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.18)}
.spec h3{font-size:clamp(22px,2.6vw,30px);letter-spacing:-.02em;line-height:1.25}
.spec h3 small{display:block;font-size:14px;font-weight:600;color:#7fb9b0;letter-spacing:.06em;text-transform:uppercase;margin-bottom:6px}
.spec p{color:#c9d1d6;margin-top:8px}

/* steps */
.steps{list-style:none;display:grid;grid-template-columns:repeat(3,1fr);gap:0;counter-reset:s}
.steps li{counter-increment:s;padding:0 28px 0 0;position:relative}
.steps li::before{content:counter(s,decimal-leading-zero);display:block;font-size:48px;font-weight:800;letter-spacing:-.04em;color:transparent;-webkit-text-stroke:1.5px var(--blue);line-height:1;margin-bottom:18px}
.steps li + li{padding-left:28px;border-left:1px solid var(--line)}
.steps h3{font-size:19px;margin-bottom:6px}
.steps p{color:var(--ink-2);font-size:15.5px}

/* buy band */
.buy{background:var(--blue);color:var(--white);position:relative;overflow:hidden}
.buy::after{content:"";position:absolute;right:-80px;top:-60px;width:420px;aspect-ratio:1/1.1547;clip-path:polygon(50% 0,100% 25%,100% 75%,50% 100%,0 75%,0 25%);background:linear-gradient(160deg,var(--teal),transparent 75%);opacity:.45;pointer-events:none}
.buy .wrap{position:relative;z-index:1;display:grid;grid-template-columns:1.2fr .8fr;gap:40px;align-items:center}
.buy h2{color:var(--white)}
.buy p{color:#cfe0e8;margin-top:14px;font-size:17px;max-width:32em}
.buy .actions{display:flex;flex-direction:column;gap:12px;align-items:stretch}
.btn-light{background:var(--white);color:var(--blue);justify-content:center}
.btn-light:hover{transform:translateY(-2px);background:var(--teal-soft)}
.btn-line{border:1.5px solid rgba(255,255,255,.6);color:var(--white);justify-content:center}
.btn-line:hover{background:rgba(255,255,255,.1)}
.buy small{display:block;color:#a9c4d1;font-size:13.5px;text-align:center}

footer{padding:40px 0 48px;font-size:14px;color:var(--ink-2)}
footer .wrap{display:flex;flex-wrap:wrap;gap:16px 32px;justify-content:space-between;align-items:center}
footer img{width:110px;opacity:.9}
footer a{text-decoration:none;font-weight:600;color:var(--blue)}

.reveal{opacity:0;transform:translateY(18px);transition:opacity .7s var(--ease),transform .7s var(--ease)}
.reveal.in{opacity:1;transform:none}

/* nav */
.nav{display:flex;align-items:center;gap:4px;margin-left:auto}
.nav a{font-size:15px;font-weight:600;text-decoration:none;color:var(--ink-2);padding:8px 12px;border-radius:999px;transition:background .2s,color .2s}
.nav a:hover{background:var(--paper-2);color:var(--ink)}
.nav a[aria-current="page"]{color:var(--blue);background:var(--teal-soft)}

/* sub pages */
.page-hero{padding:56px 0 40px}
.page-hero h1{font-size:clamp(30px,4.4vw,52px);margin:16px 0 16px}
.page-hero .lede{max-width:40em}
.prose{max-width:760px}
.prose h2{font-size:clamp(22px,2.6vw,30px);margin:56px 0 16px}
.prose h2:first-child{margin-top:0}
.prose h3{font-size:19px;margin:28px 0 8px}
.prose p,.prose li{color:var(--ink-2);font-size:16.5px}
.prose p+p{margin-top:12px}
.prose ul,.prose ol{padding-left:22px;margin-top:10px}
.prose li+li{margin-top:6px}
.prose a{color:var(--blue);font-weight:600}
.prose strong{color:var(--ink)}
.facts{display:grid;grid-template-columns:repeat(4,1fr);border-top:2px solid var(--ink);margin:8px 0 0}
.fact{padding:22px 20px 6px 0}
.fact + .fact{padding-left:20px;border-left:1px solid var(--line)}
.fact b{display:block;font-size:clamp(26px,3vw,36px);font-weight:800;letter-spacing:-.03em;color:var(--blue);line-height:1.1}
.fact span{display:block;font-size:14.5px;color:var(--ink-2);margin-top:6px}
.table-wrap{overflow-x:auto;margin-top:14px;-webkit-overflow-scrolling:touch}
.tbl{width:100%;border-collapse:collapse;font-size:15.5px;background:var(--white);border:1px solid var(--line);border-radius:var(--r);overflow:hidden}
.tbl th,.tbl td{text-align:left;padding:14px 16px;border-bottom:1px solid var(--line);vertical-align:top}
.tbl thead th{background:var(--paper-2);font-size:13.5px;letter-spacing:.02em;color:var(--ink)}
.tbl tr:last-child td{border-bottom:0}
.tbl td:first-child{font-weight:700;color:var(--ink);white-space:nowrap}
.note{font-size:14px;color:var(--ink-2);margin-top:10px}
.pairs{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin-top:22px}
.pair{background:var(--ink);color:var(--paper);border-radius:var(--r);padding:24px 22px}
.pair small{display:block;font-size:12.5px;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:#7fb9b0;margin-bottom:6px}
.pair h3{font-size:20px;letter-spacing:-.02em}
.pair p{color:#c9d1d6;font-size:15px;margin-top:10px}
.pair .formula{font-size:17px;margin-top:16px;flex-wrap:wrap}
.pair .formula .c{width:42px;height:42px;font-size:15px}

/* faq */
.faq{border-top:2px solid var(--ink)}
.faq details{border-bottom:1px solid var(--line)}
.faq summary{list-style:none;cursor:pointer;padding:22px 44px 22px 0;font-size:18px;font-weight:700;letter-spacing:-.01em;position:relative}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"";position:absolute;right:6px;top:50%;width:12px;height:12px;border-right:2px solid var(--blue);border-bottom:2px solid var(--blue);transform:translateY(-70%) rotate(45deg);transition:transform .25s var(--ease)}
.faq details[open] summary::after{transform:translateY(-30%) rotate(-135deg)}
.faq summary:hover{color:var(--blue)}
.faq .a{padding:0 0 24px;color:var(--ink-2);font-size:16px;max-width:46em}
.faq .a p+p{margin-top:10px}
.faq .a a{color:var(--blue);font-weight:600}

/* inquiry form */
.inquiry .wrap{display:grid;grid-template-columns:.85fr 1.15fr;gap:48px;align-items:start}
.inquiry .side p{color:var(--ink-2);font-size:17px;margin-top:14px}
.inquiry .side ul{list-style:none;margin-top:22px;display:grid;gap:10px}
.inquiry .side li{display:flex;gap:10px;color:var(--ink-2);font-size:15.5px}
.inquiry .side li::before{content:"";flex:none;width:12px;height:14px;margin-top:6px;background:var(--teal);clip-path:polygon(50% 0,100% 25%,100% 75%,50% 100%,0 75%,0 25%)}
.form{background:var(--white);border:1px solid var(--line);border-radius:calc(var(--r) + 6px);padding:32px;display:grid;gap:18px}
.row{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.field{display:grid;gap:7px}
.field > span,.field legend{font-size:14.5px;font-weight:700;color:var(--ink)}
.field em{font-style:normal;color:var(--teal-ink);font-weight:600;font-size:13px;margin-left:4px}
.field input,.field textarea,.field select{font:inherit;font-size:16px;color:var(--ink);background:var(--paper);border:1.5px solid var(--line);border-radius:10px;padding:12px 14px;transition:border-color .2s,background .2s;width:100%}
.field textarea{min-height:120px;resize:vertical}
.field input:focus,.field textarea:focus,.field select:focus{outline:none;border-color:var(--teal);background:var(--white)}
.field input[aria-invalid="true"],.field textarea[aria-invalid="true"]{border-color:#b3261e}
fieldset.field{border:0;min-width:0}
.chips{display:flex;flex-wrap:wrap;gap:8px}
.chip{position:relative}
.chip input{position:absolute;opacity:0;width:1px;height:1px}
.chip label{display:inline-flex;align-items:center;padding:9px 14px;border:1.5px solid var(--line);border-radius:999px;font-size:15px;font-weight:600;color:var(--ink-2);cursor:pointer;background:var(--paper);transition:all .2s}
.chip input:checked + label{background:var(--blue);border-color:var(--blue);color:var(--white)}
.chip input:focus-visible + label{outline:3px solid var(--teal);outline-offset:2px}
.consent{display:flex;gap:10px;align-items:flex-start;font-size:14.5px;color:var(--ink-2)}
.consent input{width:18px;height:18px;margin-top:3px;accent-color:var(--blue);flex:none}
.consent a{color:var(--blue);font-weight:600}
.hp{position:absolute;left:-9999px;width:1px;height:1px;overflow:hidden}
.form .btn{justify-content:center;border:0;cursor:pointer;font-family:inherit}
.form .btn[disabled]{opacity:.6;cursor:wait;transform:none}
.form-msg{font-size:15px;font-weight:600;min-height:1.4em}
.form-msg.ok{color:var(--teal-ink)}
.form-msg.err{color:#b3261e}

footer .links{display:flex;gap:16px}
.section-facts{padding:56px 0}
.section-tight{padding-top:24px}
.faq + .note{margin-top:24px}
.spec a{color:#7fb9b0;font-weight:700}
.inquiry .side a{color:var(--blue);font-weight:700;white-space:nowrap}

@media (max-width:900px){
  .inquiry .wrap{grid-template-columns:1fr;gap:28px}
  .facts{grid-template-columns:repeat(2,1fr)}
  .fact:nth-child(3){padding-left:0;border-left:0}
  .pairs{grid-template-columns:1fr}
  .hero{padding:40px 0 64px}
  .hero .wrap,.sec-head,.buy .wrap{grid-template-columns:1fr}
  .hexes{justify-self:center;max-width:300px}
  .subjects{grid-template-columns:repeat(2,1fr)}
  .subj:last-child{grid-column:1/-1}
  .points,.steps{grid-template-columns:1fr}
  .point,.point + .point{padding:24px 0 8px;border-left:0;border-top:1px solid var(--line)}
  .point:first-child{border-top:0}
  .steps li,.steps li + li{padding:24px 0;border-left:0;border-top:1px solid var(--line)}
  .steps li:first-child{border-top:0;padding-top:0}
  .spec{grid-template-columns:1fr;padding:32px 24px}
  section{padding:72px 0}
}
@media (max-width:640px){
  .nav a{padding:8px 9px;font-size:14px}
  .top .tel{display:none}
  .row{grid-template-columns:1fr}
  .form{padding:22px}
}
@media (max-width:420px){
  .top img{width:110px}
  .top .tel span{display:none}
  .formula{font-size:18px;gap:6px}
  .formula .c{width:44px;height:44px}
  .btn{width:100%;justify-content:center}
}
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation:none!important;transition:none!important}
  .reveal{opacity:1;transform:none}
}