:root{
  --ink:#f7f6f2;
  --paper:#0e1116;
  --line:#2a2d32;
  --accent:#f97316;       /* 선명 오렌지 */
  --accent-soft:rgba(249,115,22,0.12);
  --muted:#b1aaa2;
  --surface:#171a20;
  --ink-fixed:#0e1116;     /* 테마와 무관하게 항상 어두운 면 */
  --paper-fixed:#f7f6f2;   /* 위 면 위의 밝은 글자 */
  --maxw:1040px;
  }
  *{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;
  }
  .wrap{max-width:var(--maxw);margin:0 auto;padding:0 24px}

  /* ---------- nav ---------- */
  nav{
  position:sticky;top:0;z-index:50;
  background:rgba(14,17,22,.88);backdrop-filter:blur(12px);
  border-bottom:1px solid var(--line);
  }
  nav .wrap{display:flex;align-items:center;justify-content:space-between;height:60px}
  .nav-right{display:flex;align-items:center;gap:20px}

  .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(--paper-fixed);color:var(--ink-fixed);
  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(0,0,0,.22);
  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)}
#nav-toggle{
  display:none;background:none;border:none;cursor:pointer;color:var(--ink);
  padding:8px;border-radius:8px;transition:background 0.2s;
  align-items:center;justify-content:center;
}
#nav-toggle:hover{background:var(--accent-soft)}
@media(max-width:680px){
  #nav-toggle{display:flex}
  .nav-right{gap:6px}
  nav ul{
    display:none;position:absolute;top:60px;left:0;right:0;
    flex-direction:column;gap:0;
    background:rgba(14,17,22,.98);backdrop-filter:blur(12px);
    border-bottom:1px solid var(--line);padding:8px 24px 16px;
  }
  nav ul.open{display:flex}
  nav ul li{padding:6px 0}
  nav ul a{font-size:1rem}
  .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;
  background:
    linear-gradient(rgba(38,17,7,.84),rgba(38,17,7,.70)),
    url("/assets/lecture-1-hero.webp") center right/cover no-repeat;
  background-attachment:scroll;color:#fff;
}
.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:rgba(247,249,255,.68);
  filter:blur(5px);opacity:.55;
  animation:hero-sharpen 2.4s cubic-bezier(.2,.7,.2,1) .5s forwards;
  display:inline-block;
}
h1 .clear{color:var(--accent)}
@keyframes hero-sharpen{to{filter:blur(0);opacity:1;color:#fff}}
@keyframes sharpen{to{filter:blur(0);opacity:1;color:var(--ink)}}
.hero-sub{
  margin-top:28px;max-width:620px;font-size:1.08rem;color:rgba(247,249,255,.82);
}
.hero-sub strong{color:#fff;font-weight:700}
.hero-en{
  margin-top:14px;font-size:.92rem;color:rgba(247,249,255,.76);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(249,115,22,.28)}
.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)}
header .btn-ghost{border-color:rgba(247,249,255,.78);color:#fff}
header .btn-ghost:hover{background:#fff;color:#0e1116}
@media(max-width:680px){
  header{
    padding:86px 0 72px;
    background:
      linear-gradient(rgba(38,17,7,.88),rgba(38,17,7,.78)),
      url("/assets/lecture-1-hero.webp") 62% center/cover no-repeat;
    background-attachment:scroll;
  }
}

/* ---------- 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-fixed);color:var(--paper-fixed);
  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:#ffb26b}
.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 ---------- */
#identity{padding:76px 0}
#identity .wrap{max-width:1080px}
.identity-head{
  display:grid;grid-template-columns:minmax(0,1.4fr) minmax(260px,1fr);gap:40px;align-items:stretch;
  background:linear-gradient(135deg,var(--surface),var(--accent-soft));
  border:1px solid var(--line);border-radius:14px;padding:44px 48px;
  box-shadow:0 12px 28px rgba(14,17,22,.05);
}
.identity-copy{display:flex;flex-direction:column}
.identity-copy .lead{max-width:660px}
.identity-summary{
  margin-top:18px;max-width:660px;font-size:1.02rem;font-weight:800;letter-spacing:-.015em;
  color:var(--ink);border-left:3px solid var(--accent);padding-left:16px;
}
.identity-mini-stats{
  display:flex;align-items:center;gap:14px;flex-wrap:wrap;margin-top:auto;padding-top:34px;
}
.identity-mini-stats div{display:flex;align-items:baseline;gap:6px}
.identity-mini-stats div+div::before{content:"";width:4px;height:4px;border-radius:50%;background:var(--line);margin-right:8px}
.identity-mini-stats strong{font-size:1.12rem;line-height:1;font-weight:800;color:var(--ink)}
.identity-mini-stats span{font-size:.75rem;font-weight:700;color:var(--muted)}
.profile-frame{
  position:relative;height:100%;min-height:340px;overflow:hidden;
  border-radius:20px;background:radial-gradient(ellipse at 50% 30%, #493122 0%, #1f1814 70%);
}
.profile-panel-label{
  position:absolute;left:22px;top:20px;z-index:2;color:#fb923c;
  font-size:11px;font-weight:800;letter-spacing:.1em;
}
.profile-photo-crop{
  position:absolute;inset:48px 18px 0;overflow:hidden;
  display:flex;align-items:flex-end;justify-content:center;
}
.profile-frame img{
  display:block;width:auto;height:100%;object-fit:contain;object-position:bottom center;
}
.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-top:32px;align-items:stretch}
@media(max-width:760px){
  #identity{padding:68px 0}
  .identity-head{grid-template-columns:1fr;gap:24px;padding:32px 24px}
  .identity-copy{display:contents}
  .identity-copy .sec-label{order:1}
  .identity-copy h2{order:2}
  .identity-copy .lead{order:3}
  .identity-summary{order:4}
  .profile-frame{order:5;min-height:360px}
  .identity-mini-stats{order:6}
  .identity-mini-stats{margin-top:0;padding-top:24px}
}
@media(max-width:760px){.cards{grid-template-columns:1fr}}
.card{
  height:100%;display:flex;flex-direction:column;
  background:var(--surface);border:1px solid var(--line);border-radius:10px;padding:26px 24px;
  box-shadow:0 8px 22px rgba(14,17,22,.04);
  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 .context{font-size:.78rem;color:var(--muted);margin-top:8px;line-height:1.5}
.stat .src{font-size:.76rem;color:var(--muted);margin-top:4px}
.proof-quotes{
  display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:28px;
}
.proof-quote{
  background:var(--surface);border:1px solid var(--line);border-left:4px solid var(--accent);
  border-radius:10px;padding:22px 22px 20px;
}
.proof-quote blockquote{
  border:0;padding:0;font-size:.96rem;line-height:1.7;font-weight:700;color:var(--ink);
}
.proof-quote figcaption{margin-top:14px;font-size:.76rem;line-height:1.55;color:var(--muted)}
.stats-note{margin-top:16px;font-size:.82rem;color:var(--muted)}
.proof-actions{margin-top:24px}
@media(max-width:860px){.proof-quotes{grid-template-columns:1fr}}

/* ---------- 트랙 레코드 ---------- */
#record{
  background:
    linear-gradient(rgba(38,17,7,.82),rgba(38,17,7,.78)),
    url("/assets/lecture-2-record.webp") center right/cover no-repeat;
  background-attachment:scroll;color:#fff;
}
#record h2{color:#fff}
#record .lead{color:rgba(247,249,255,.84)}
#record .lead strong{color:#fff}
#record .record-line{color:rgba(247,249,255,.78)}
#record .record-line strong{color:#fff}
.orgs{
  margin-top:40px;display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:12px;
}
.org{
  min-height:86px;padding:16px 14px;border:1px solid rgba(247,249,255,.16);border-radius:10px;
  background:rgba(31,18,10,.58);box-shadow:inset 0 1px 0 rgba(255,255,255,.06);
  display:flex;flex-direction:column;justify-content:space-between;gap:12px;color:#fff;
}
.org-mark{
  display:flex;align-items:center;justify-content:center;width:44px;height:28px;border-radius:6px;
  background:rgba(255,247,237,.92);color:#25130a;font-size:.76rem;font-weight:900;letter-spacing:.02em;
}
.org span:last-child{
  font-size:.86rem;font-weight:800;letter-spacing:-.02em;line-height:1.35;
}
.record-line{margin-top:26px;font-size:.95rem;color:var(--muted)}
.record-line strong{color:var(--ink)}
@media(max-width:860px){.orgs{grid-template-columns:repeat(3,minmax(0,1fr))}}
@media(max-width:680px){.orgs{grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}.org{min-height:82px}}

/* ---------- 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:var(--surface);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-fixed);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}
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-fixed);color:var(--paper-fixed);border-bottom:none}
.contact .sec-label{color:#ffb26b}
.contact h2{color:var(--paper-fixed)}
.contact .lead{color:rgba(247,246,242,.7)}
.contact .btn-ghost{border-color:rgba(247,246,242,.6);color:var(--paper-fixed)}
.contact .btn-ghost:hover{background:var(--paper-fixed);color:var(--ink-fixed)}
.response-note{margin-top:18px;font-size:.95rem;font-weight:700;color:#ffb26b}
.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-fixed);
  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:#ffb26b;background:rgba(247,246,242,.12);
  box-shadow:0 0 0 3px rgba(249,115,22,.22);
}
.contact-form option{color:#0e1116}
.hidden-field{
  position:absolute;left:-9999px;width:1px;height:1px;overflow:hidden;
  opacity:0;pointer-events:none;
}
.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}
}

@media(max-width:560px){
  .wrap{padding:0 20px}
  section{padding:64px 0}
  .hero-cta .btn{width:100%;text-align:center}
  .identity-head{padding:28px 20px;border-radius:12px}
  .profile-frame{min-height:330px;border-radius:16px}
  .profile-photo-crop{inset:46px 10px 0}
  .identity-mini-stats{display:grid;grid-template-columns:1fr;gap:8px}
  .identity-mini-stats div+div::before{display:none}
  .stats{grid-template-columns:1fr;gap:12px}
  .stat{padding:24px 20px}
  .topic,.card,.proof-quote{padding:22px 20px}
}

footer{background:var(--ink-fixed);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}
.footer-social{display:flex;gap:14px;align-items:center;flex-wrap:wrap}
.footer-social a{
  display:inline-flex;align-items:center;gap:6px;color:rgba(247,246,242,.66);
  text-decoration:none;font-weight:700;transition:color .15s;
}
.footer-social a:hover{color:#fff}
.footer-social svg{width:18px;height:18px;fill:currentColor;flex:0 0 auto}

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

/* 모션 최소화 선호 사용자 대응 */
@media(prefers-reduced-motion:reduce){
  *{animation-duration:.001ms!important;animation-iteration-count:1!important;transition-duration:.001ms!important}
  html{scroll-behavior:auto}
  .reveal{opacity:1;transform:none}
  h1 .vague{filter:none;opacity:1;color:var(--ink)}
  header h1 .vague{color:#fff}
}