:root{
  --ink:#0e1116;
  --paper:#f7f6f2;
  --line:#dcd9d2;
  --accent:#1e5eff;       /* 선명 블루 */
  --accent-soft:#e8efff;
  --muted:#5c6470;
  --maxw:1040px;
  }
  [data-theme="dark"] {
  --ink:#f7f6f2;
  --paper:#0e1116;
  --line:#2a2d32;
  --accent:#4d85ff;
  --accent-soft:rgba(30,94,255,0.1);
  --muted:#a0a7b1;
  }
  *{margin:0;padding:0;box-sizing:border-box}
  html{scroll-behavior:smooth}
  body{
  font-family:"Pretendard Variable",Pretendard,-apple-system,"Segoe UI","Malgun Gothic",sans-serif;
  background:var(--paper);color:var(--ink);
  line-height:1.7;-webkit-font-smoothing:antialiased;
  transition: background-color 0.3s ease, color 0.3s ease;
  }
  .wrap{max-width:var(--maxw);margin:0 auto;padding:0 24px}

  /* ---------- nav ---------- */
  nav{
  position:sticky;top:0;z-index:50;
  background:rgba(var(--nav-bg-rgb, 247,246,242),.88);backdrop-filter:blur(12px);
  border-bottom:1px solid var(--line);
  }
  [data-theme="dark"] nav {
  --nav-bg-rgb: 14,17,22;
  }
  nav .wrap{display:flex;align-items:center;justify-content:space-between;height:60px}
  .nav-right{display:flex;align-items:center;gap:20px}
  #theme-toggle{
  background:none;border:none;cursor:pointer;color:var(--ink);
  padding:8px;border-radius:50%;transition:background 0.2s;
  display:flex;align-items:center;justify-content:center;
  }
  #theme-toggle:hover{background:var(--accent-soft)}
  #theme-toggle .sun-icon{display:none}
  [data-theme="dark"] #theme-toggle .sun-icon{display:block}
  [data-theme="dark"] #theme-toggle .moon-icon{display:none}

  .logo{
  display:flex;align-items:center;gap:10px;color:var(--ink);text-decoration:none;
  min-width:0;
}
.logo-mark{
  position:relative;width:42px;height:34px;border-radius:8px;background:var(--ink);color:var(--paper);
  display:flex;align-items:center;justify-content:center;gap:1px;
  font-weight:800;font-size:.88rem;letter-spacing:.02em;line-height:1;
  box-shadow:0 8px 18px rgba(14,17,22,.16);
  overflow:hidden;
}
.logo-mark::before{
  content:"";position:absolute;inset:0;
  background:linear-gradient(135deg,transparent 0 38%,rgba(255,255,255,.2) 38% 44%,transparent 44% 100%);
}
.logo-mark::after{
  content:"";position:absolute;right:6px;bottom:6px;width:16px;height:2px;border-radius:999px;
  background:var(--accent);
}
.logo-mark span{
  position:relative;z-index:1;
}
.logo-text{
  display:grid;gap:1px;line-height:1.1;letter-spacing:-.02em;
}
.logo strong{font-size:1rem;font-weight:800}
.logo em{font-style:normal;color:var(--accent);font-size:.82rem;font-weight:700}
nav ul{display:flex;gap:26px;list-style:none}
nav ul a{color:var(--muted);text-decoration:none;font-size:.9rem;font-weight:600;transition:color .2s}
nav ul a:hover{color:var(--ink)}
@media(max-width:680px){
  nav ul{display:none}
  .nav-right{gap:10px}
  .logo-mark{width:38px;height:32px;font-size:.82rem}
  .logo strong{font-size:.95rem}
  .logo em{font-size:.78rem}
}

/* ---------- hero : 막연함 → 선명함 ---------- */
header{padding:110px 0 90px;border-bottom:1px solid var(--line);overflow:hidden}
.kicker{
  display:inline-block;font-size:.82rem;font-weight:700;letter-spacing:.14em;
  color:var(--accent);text-transform:uppercase;margin-bottom:22px;
}
h1{
  font-size:clamp(2.4rem,6.4vw,4.4rem);font-weight:800;
  letter-spacing:-.035em;line-height:1.18;
}
h1 .vague{
  color:var(--muted);
  filter:blur(5px);opacity:.55;
  animation:sharpen 2.4s cubic-bezier(.2,.7,.2,1) .5s forwards;
  display:inline-block;
}
h1 .clear{color:var(--accent)}
@keyframes sharpen{to{filter:blur(0);opacity:1;color:var(--ink)}}
.hero-sub{
  margin-top:28px;max-width:620px;font-size:1.08rem;color:var(--muted);
}
.hero-sub strong{color:var(--ink);font-weight:700}
.hero-en{
  margin-top:14px;font-size:.92rem;color:var(--muted);letter-spacing:.02em;font-weight:500;
}
.hero-cta{margin-top:40px;display:flex;gap:14px;flex-wrap:wrap}
.btn{
  display:inline-block;padding:13px 26px;border-radius:8px;font-weight:700;font-size:.94rem;
  text-decoration:none;transition:transform .15s,box-shadow .15s;
}
.btn-primary{background:var(--accent);color:#fff;box-shadow:0 6px 18px rgba(30,94,255,.25)}
.btn-primary:hover{transform:translateY(-2px)}
.btn-ghost{border:1.5px solid var(--ink);color:var(--ink)}
.btn-ghost:hover{background:var(--ink);color:var(--paper)}

/* ---------- section base ---------- */
section{padding:88px 0;border-bottom:1px solid var(--line)}
.sec-label{
  font-size:.8rem;font-weight:700;letter-spacing:.14em;color:var(--accent);
  text-transform:uppercase;margin-bottom:14px;
}
h2{font-size:clamp(1.5rem,3.4vw,2.1rem);font-weight:800;letter-spacing:-.025em;line-height:1.35;margin-bottom:18px}
.lead{max-width:640px;color:var(--muted);font-size:1.02rem}
.lead strong{color:var(--ink)}

/* ---------- 명제 ---------- */
.thesis{
  margin-top:44px;background:var(--ink);color:var(--paper);
  border-radius:14px;padding:46px 44px;
}
.thesis p.big{font-size:clamp(1.2rem,2.6vw,1.55rem);font-weight:700;letter-spacing:-.02em;line-height:1.6}
.thesis p.big em{font-style:normal;color:#7da3ff}
.thesis .arrow-row{
  display:flex;align-items:center;gap:18px;margin-top:30px;flex-wrap:wrap;
}
.state{
  padding:12px 22px;border-radius:999px;font-weight:700;font-size:.95rem;white-space:nowrap;
}
.state.fog{border:1.5px dashed rgba(247,246,242,.45);color:rgba(247,246,242,.65)}
.state.sharp{background:var(--accent);color:#fff}
.arrow{font-size:1.3rem;color:rgba(247,246,242,.5)}
@media(max-width:560px){.thesis{padding:34px 26px}}

/* ---------- 정체성 3 ---------- */
.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:44px}
@media(max-width:760px){.cards{grid-template-columns:1fr}}
.card{
  background:#fff;border:1px solid var(--line);border-radius:12px;padding:30px 26px;
  transition:transform .2s,box-shadow .2s;
}
.card:hover{transform:translateY(-4px);box-shadow:0 14px 30px rgba(14,17,22,.08)}
.card .num{font-size:.8rem;font-weight:700;color:var(--accent);letter-spacing:.1em;margin-bottom:12px}
.card h3{font-size:1.12rem;font-weight:800;letter-spacing:-.02em;margin-bottom:10px}
.card p{font-size:.92rem;color:var(--muted)}

/* ---------- 숫자 ---------- */
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;margin-top:44px}
@media(max-width:760px){.stats{grid-template-columns:repeat(2,1fr)}}
.stat{
  background:var(--accent-soft);border-radius:12px;padding:28px 22px;text-align:left;
}
.stat .val{font-size:clamp(1.7rem,4vw,2.3rem);font-weight:800;letter-spacing:-.03em;color:var(--accent)}
.stat .key{font-size:.88rem;font-weight:600;color:var(--ink);margin-top:6px}
.stat .src{font-size:.76rem;color:var(--muted);margin-top:4px}
.stats-note{margin-top:16px;font-size:.82rem;color:var(--muted)}

/* ---------- 트랙 레코드 ---------- */
.orgs{margin-top:40px;display:flex;flex-wrap:wrap;gap:10px}
.org{
  padding:9px 18px;border:1px solid var(--line);border-radius:999px;background:#fff;
  font-size:.88rem;font-weight:600;color:var(--ink);
}
.record-line{margin-top:26px;font-size:.95rem;color:var(--muted)}
.record-line strong{color:var(--ink)}

/* ---------- 강의 주제 ---------- */
.topics{margin-top:40px;display:grid;grid-template-columns:repeat(2,1fr);gap:14px}
@media(max-width:680px){.topics{grid-template-columns:1fr}}
.topic{
  background:#fff;border:1px solid var(--line);border-left:4px solid var(--accent);
  border-radius:10px;padding:22px 24px;
}
.topic h3{font-size:1rem;font-weight:800;margin-bottom:6px;letter-spacing:-.01em}
.topic p{font-size:.88rem;color:var(--muted)}

/* ---------- 브랜드 기준 ---------- */
.origin{display:grid;grid-template-columns:160px 1fr;gap:44px;align-items:center;margin-top:44px}
@media(max-width:680px){.origin{grid-template-columns:1fr;gap:24px}}
.clarity-mark{
  min-height:140px;border-radius:14px;background:var(--ink);position:relative;
  display:flex;align-items:center;justify-content:center;gap:12px;overflow:hidden;
}
.clarity-mark::before{
  content:"AI";position:absolute;left:18px;top:16px;color:rgba(247,246,242,.24);
  font-size:.9rem;font-weight:800;letter-spacing:.18em;
}
.clarity-mark::after{
  content:"";position:absolute;inset:auto 18px 18px 18px;height:2px;background:linear-gradient(90deg,transparent,var(--accent));
}
.signal{
  display:block;width:18px;border-radius:999px;background:var(--accent);
}
.signal-soft{height:42px;opacity:.28;filter:blur(2px)}
.signal-mid{height:72px;opacity:.58;filter:blur(.7px)}
.signal-clear{height:104px;opacity:1}
[data-theme="dark"] .logo-mark{
  background:var(--paper);color:#0e1116;box-shadow:0 8px 18px rgba(0,0,0,.22);
}
blockquote{
  font-size:1.05rem;line-height:1.85;color:var(--ink);
  border-left:3px solid var(--accent);padding-left:24px;font-weight:500;
}
blockquote em{font-style:normal;color:var(--accent);font-weight:700}

/* ---------- contact ---------- */
.contact{background:var(--ink);color:var(--paper);border-bottom:none}
.contact .sec-label{color:#7da3ff}
.contact h2{color:var(--paper)}
.contact .lead{color:rgba(247,246,242,.7)}
.contact-row{margin-top:36px;display:flex;gap:14px;flex-wrap:wrap}
.contact .btn-ghost{border-color:rgba(247,246,242,.6);color:var(--paper)}
.contact .btn-ghost:hover{background:var(--paper);color:var(--ink)}
.contact-form{
  margin-top:38px;max-width:760px;display:grid;gap:18px;
}
.form-grid{
  display:grid;grid-template-columns:repeat(2,1fr);gap:16px;
}
.contact-form label{
  display:grid;gap:8px;font-size:.9rem;font-weight:700;color:rgba(247,246,242,.82);
}
.contact-form input,
.contact-form select,
.contact-form textarea{
  width:100%;border:1px solid rgba(247,246,242,.22);border-radius:8px;
  background:rgba(247,246,242,.08);color:var(--paper);
  padding:13px 14px;font:inherit;font-size:.95rem;outline:none;
  transition:border-color .15s,background .15s,box-shadow .15s;
}
.contact-form select{appearance:auto}
.contact-form textarea{resize:vertical;min-height:150px}
.contact-form input::placeholder,
.contact-form textarea::placeholder{color:rgba(247,246,242,.42)}
.contact-form input:focus,
.contact-form select:focus,
.contact-form textarea:focus{
  border-color:#7da3ff;background:rgba(247,246,242,.12);
  box-shadow:0 0 0 3px rgba(125,163,255,.18);
}
.contact-form option{color:#0e1116}
.hidden-field{position:absolute;left:-9999px;width:1px;height:1px;overflow:hidden}
.form-actions{display:flex;gap:14px;flex-wrap:wrap;align-items:center;margin-top:4px}
.contact-form button{border:0;cursor:pointer;font-family:inherit}
@media(max-width:680px){
  .form-grid{grid-template-columns:1fr}
  .contact-form{gap:16px}
  .form-actions .btn{width:100%;text-align:center}
}

footer{background:var(--ink);color:rgba(247,246,242,.45);padding:34px 0;font-size:.82rem}
footer .wrap{display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px}

/* reveal on scroll */
.reveal{opacity:0;transform:translateY(22px);transition:opacity .7s ease,transform .7s ease}
.reveal.on{opacity:1;transform:none}