/* AI인사이트 메인 — 몰입형 (SOP 42)
   구조: SC-05 고정 히어로 → 스크롤 연동 교정 장면(pin+scrub) → SC-04 고정 가로 → SC-03 패널 덮기 → 밝은 판 전환
   효과: 3D 로고(Three.js, VG 히어로 스터디 응용) · 입자 신호(비지오플랜 로더 응용) · GSAP ScrollTrigger · Lenis */
body.home{background:#07080b;color:#eceef2}
body.home .proto{background:#000;color:#9aa0aa}
body.home .hd{background:transparent;border-bottom-color:transparent;position:fixed;left:0;right:0;transition:background .4s,border-color .4s}
body.home .hd .brand,body.home .hd .nav a{color:#eceef2}
body.home .hd .nav a:hover{background:rgba(255,255,255,.08)}
body.home .hd .icon-btn{color:#c7cbd3}
body.home .hd .icon-btn:hover{background:rgba(255,255,255,.08)}
body.home .hd .btn-ghost{color:#eceef2;border-color:rgba(255,255,255,.22)}
body.home .hd .btn-ink{background:#eceef2;color:#07080b}
body.home.light-hd .hd{background:var(--paper);border-bottom-color:var(--rule)}
body.home.light-hd .hd .brand,body.home.light-hd .hd .nav a{color:var(--ink)}
body.home.light-hd .hd .btn-ghost{color:var(--ink);border-color:var(--rule-2)}
body.home.light-hd .hd .btn-ink{background:var(--ink);color:var(--paper)}
body.home.light-hd .hd .icon-btn{color:var(--gray)}
body.home.dark-hd .hd{background:rgba(7,8,11,.92);border-bottom-color:rgba(255,255,255,.08)}

/* 3D 무대(고정) */
.gl{position:fixed;inset:0;z-index:0;pointer-events:none}
.gl canvas{width:100%;height:100%;display:block}
.gl-poster{position:absolute;left:50%;top:44%;width:min(46vw,420px);transform:translate(-50%,-50%);opacity:.95;transition:opacity .6s}
.gl.ready .gl-poster{opacity:0}
.home main{position:relative;z-index:1}

/* 장면 1: 첫 화면 */
.stage{min-height:100vh;display:grid;align-items:end;padding:0 0 clamp(40px,7vh,88px)}
.stage-copy{display:grid;grid-template-columns:minmax(0,1fr) auto;align-items:end;gap:32px}
.stage h1{margin:0;font-size:clamp(44px,7vw,112px);line-height:.96;letter-spacing:-.065em;font-weight:800;color:#f4f5f7}
.stage h1 .ln{display:block;overflow:hidden;padding-bottom:.04em}
.stage h1 .ln>span{display:block;transform:translateY(108%);transition:transform 1.2s var(--ease)}
.stage.on h1 .ln>span{transform:none}
.stage h1 .ln:nth-child(2)>span{transition-delay:.12s}
.stage-side{max-width:330px;color:#a9aeb8;font-size:var(--t-md);line-height:1.6;opacity:0;transform:translateY(16px);transition:opacity 1s .5s,transform 1.2s .5s var(--ease)}
.stage.on .stage-side{opacity:1;transform:none}
.stage-side .row{display:flex;gap:10px;margin-top:22px;flex-wrap:wrap}
.btn-light{background:#eceef2;color:#07080b}
.btn-light:hover{background:#fff}
.btn-dim{border-color:rgba(255,255,255,.24);color:#eceef2}
.btn-dim:hover{border-color:#eceef2}
.scroll-cue{position:absolute;left:50%;bottom:22px;transform:translateX(-50%);display:grid;justify-items:center;gap:8px;font-size:12px;color:#7d838e}
.scroll-cue i{width:1px;height:42px;background:linear-gradient(#7d838e,transparent);animation:cue 2.2s var(--ease) infinite}
@keyframes cue{0%{transform:scaleY(0);transform-origin:top}50%{transform:scaleY(1);transform-origin:top}51%{transform-origin:bottom}100%{transform:scaleY(0);transform-origin:bottom}}
@media (max-width:820px){.stage-copy{grid-template-columns:1fr}.stage{align-items:end;padding-bottom:64px}}

/* 장면 2: 스크롤 교정판 (pin + scrub) */
.proofx{position:relative;min-height:100vh;display:grid;align-items:center}
.proofx-in{display:grid;grid-template-columns:minmax(0,1.15fr) minmax(0,.85fr);gap:clamp(24px,4vw,64px);align-items:center;width:100%}
.proofx h2{margin:0 0 8px;font-size:clamp(34px,4.6vw,66px);line-height:1.02;letter-spacing:-.06em;color:#f4f5f7}
.proofx .sub{color:#8d939e;margin:0 0 30px}
.dx{list-style:none;margin:0;padding:0;border-top:1px solid rgba(255,255,255,.18)}
.dx li{border-bottom:1px solid rgba(255,255,255,.1)}
.dx a{display:grid;grid-template-columns:118px minmax(0,1fr);gap:18px;align-items:baseline;padding:20px 0}
.dx .w{font-size:13px;color:#7d838e;font-weight:600;line-height:1.4}
.dx .l{font-size:clamp(21px,2.4vw,34px);line-height:1.22;letter-spacing:-.05em;font-weight:800;color:#f4f5f7}
.dx del{position:relative;text-decoration:none;color:#6c727d;font-weight:500;margin-right:.35em}
.dx del::after{content:"";position:absolute;left:-3px;right:-3px;top:54%;height:3px;border-radius:2px;background:var(--pencil-glow);transform-origin:left;transform:scaleX(var(--k,1))}
.dx ins{text-decoration:none;display:inline-block;clip-path:inset(0 calc(100% - var(--n,100%)) 0 0)}
.dx ins .p{color:var(--pencil-glow);font-weight:500;margin-right:.1em}
.dx a:hover ins{color:#fff}
.proofx-note{color:#8d939e;font-size:var(--t-sm);display:grid;grid-template-columns:1fr 1fr;gap:24px;margin-top:28px;max-width:640px}
.proofx-note p{margin:0}.proofx-note b{display:block;color:#eceef2;font-size:var(--t-base)}
:root{--pencil-glow:#5b7cff}
@media (max-width:900px){.proofx-in{grid-template-columns:1fr}.dx a{grid-template-columns:1fr;gap:4px}.proofx-note{margin-left:0;max-width:none}}

/* 장면 3: 고정 가로 (SC-04) */
.hx{position:relative;overflow:hidden}
.hx-head{display:flex;justify-content:space-between;align-items:flex-end;gap:24px;padding-top:clamp(48px,8vh,96px)}
.hx-head h2{margin:0;font-size:clamp(34px,4.6vw,66px);line-height:1.02;letter-spacing:-.06em;color:#f4f5f7;max-width:12ch}
.hx-count{font-size:var(--t-sm);color:#8d939e}
.hx-count b{color:#eceef2;font-size:var(--t-lg);letter-spacing:-.04em}
.hx-track{display:flex;gap:clamp(16px,2vw,28px);padding:clamp(28px,5vh,56px) var(--gut) clamp(48px,8vh,96px);width:max-content;will-change:transform}
.hx-card{width:clamp(270px,26vw,380px);flex:none;display:grid;gap:14px;color:#eceef2}
.hx-card .m{aspect-ratio:4/5;border-radius:16px;overflow:hidden;background:#14161b;position:relative;transform:translateZ(0)}
.hx-card .m video,.hx-card .m img{width:100%;height:100%;object-fit:cover;transition:transform 1.2s var(--ease)}
.hx-card:hover .m video,.hx-card:hover .m img{transform:scale(1.05)}
.hx-card h3{margin:0;font-size:var(--t-md);line-height:1.38;letter-spacing:-.045em}
.hx-card h3 em{color:var(--pencil-glow)}
.hx-card .byline{color:#8d939e}
.hx-card .byline .cat{color:var(--pencil-glow)}
.hx-end{width:clamp(240px,22vw,320px);flex:none;display:grid;place-content:center;gap:14px;border:1px solid rgba(255,255,255,.14);border-radius:16px;aspect-ratio:4/5;padding:24px;color:#eceef2}
.hx-end b{font-size:var(--t-lg);letter-spacing:-.045em}
@media (max-width:820px){.hx-track{width:auto;flex-direction:column;padding-inline:var(--gut)}.hx-card,.hx-end{width:auto}.hx-card .m{aspect-ratio:4/3}}

/* 장면 4: 패널 덮기 (SC-03) — 써 보기 3단계 */
.stack-sec{position:relative;padding-top:clamp(48px,8vh,96px)}
.stack-sec>.wrap>h2{margin:0 0 6px;font-size:clamp(34px,4.6vw,66px);line-height:1.02;letter-spacing:-.06em;color:#f4f5f7}
.stack-sec>.wrap>p{color:#8d939e;margin:0 0 40px}
.panel3{position:sticky;top:calc(80px + var(--i) * 18px);margin-bottom:40px;border-radius:22px;overflow:hidden;background:#11131a;border:1px solid rgba(255,255,255,.1);display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);min-height:min(68vh,560px);box-shadow:0 -30px 60px rgba(0,0,0,.45)}
.panel3 .pm{background:#0c0d12;overflow:hidden}
.panel3 .pm img,.panel3 .pm video{width:100%;height:100%;object-fit:cover;object-position:center top}
.panel3 .pb{padding:clamp(24px,3.4vw,48px);display:flex;flex-direction:column;gap:18px}
.panel3 h3{margin:0;font-size:clamp(26px,2.8vw,40px);line-height:1.12;letter-spacing:-.055em;color:#f4f5f7}
.panel3 h3 em{color:var(--pencil-glow)}
.panel3 .byline{color:#8d939e}.panel3 .byline .cat{color:var(--pencil-glow)}
.panel3 ol{list-style:none;margin:0;padding:0;display:grid;gap:14px;counter-reset:s}
.panel3 li{counter-increment:s;display:grid;grid-template-columns:34px 1fr;gap:12px;align-items:baseline;color:#c7cbd3;font-size:var(--t-md);line-height:1.45}
.panel3 li::before{content:counter(s);width:34px;height:34px;border-radius:50%;border:1.5px solid var(--pencil-glow);color:var(--pencil-glow);display:grid;place-items:center;font-weight:800;font-size:14px}
.panel3 .go{margin-top:auto;align-self:flex-start}
@media (max-width:820px){.panel3{grid-template-columns:1fr;position:relative;top:auto}.panel3 .pm{aspect-ratio:16/9}}

/* 밝은 판 전환 */
.light-zone{background:var(--paper);color:var(--ink);position:relative;z-index:2;border-radius:28px 28px 0 0;margin-top:40px}
.light-zone .sec:first-child{border-top:0}
body.home .ft{background:var(--paper);position:relative;z-index:2}

/* 커뮤니티 흐르는 띠 */
.feed{overflow:hidden;border-top:1px solid var(--rule);border-bottom:1px solid var(--rule);background:var(--sheet)}
.feed-track{display:flex;width:max-content;animation:feed 60s linear infinite}
.feed:hover .feed-track{animation-play-state:paused}
.feed a{display:flex;align-items:center;gap:10px;padding:14px 26px;border-right:1px solid var(--rule);white-space:nowrap;font-size:var(--t-sm);color:var(--ink-2)}
.feed a .av{width:26px;height:26px;font-size:11px}
.feed a b{color:var(--pencil);font-weight:700}
@keyframes feed{to{transform:translateX(-50%)}}

@media (prefers-reduced-motion:reduce){
  .stage h1 .ln>span{transform:none}.stage-side{opacity:1;transform:none}
  .dx ins{clip-path:none}.dx del::after{transform:none}
  .feed-track{animation:none}.scroll-cue i{animation:none}
}
/* 시제품 표시 띠: 메인에서는 아래쪽에 고정(머리글과 겹치지 않게) */
body.home .proto{position:fixed;left:0;right:0;bottom:0;z-index:80}

/* ===== v3: 레터·커뮤니티·클래스가 보이는 메인 ===== */
.stage-copy{grid-template-columns:minmax(0,1fr)!important;gap:28px}
.stage h1{font-size:clamp(46px,7.6vw,124px)}
.stage-lede{max-width:40ch;color:#b6bbc5;font-size:clamp(16px,1.35vw,20px);line-height:1.6;margin:22px 0 0;opacity:0;transform:translateY(14px);transition:opacity 1s .45s,transform 1.2s .45s var(--ease)}
.stage.on .stage-lede{opacity:1;transform:none}
.stage-form{display:flex;gap:10px;flex-wrap:wrap;align-items:flex-start;margin-top:26px;opacity:0;transition:opacity 1s .65s}
.stage.on .stage-form{opacity:1}
.sub-form{display:flex;gap:8px;flex-wrap:wrap}
.sub-form input{height:48px;min-width:min(300px,100%);flex:1;border-radius:10px;border:1px solid rgba(255,255,255,.22);background:rgba(255,255,255,.06);color:#fff;padding:0 16px;outline:none}
.sub-form input::placeholder{color:#8d939e}
.sub-form input:focus{border-color:var(--pencil-glow)}
.sub-form .btn{height:48px}
.stage-form .form-msg{flex-basis:100%;margin:0;color:#b6bbc5}
.stage-form>.btn-dim{height:48px}
.pillars{list-style:none;margin:8px 0 0;padding:0;display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px;max-width:980px;opacity:0;transform:translateY(16px);transition:opacity 1s .85s,transform 1.2s .85s var(--ease)}
.stage.on .pillars{opacity:1;transform:none}
.pillars a{display:grid;gap:6px;padding:16px 18px;border:1px solid rgba(255,255,255,.12);border-radius:14px;background:rgba(10,12,18,.55);transition:border-color .3s,background .3s}
.pillars a:hover{border-color:var(--pencil-glow);background:rgba(43,79,216,.12)}
.pillars b{color:#f4f5f7;font-size:var(--t-md);letter-spacing:-.03em}
.pillars span{color:#9aa0aa;font-size:var(--t-sm);line-height:1.5}
@media (max-width:820px){.pillars{grid-template-columns:1fr}.stage{min-height:auto;padding-top:120px}}

/* 레터 장면 */
.mail{border:1px solid rgba(255,255,255,.14);border-radius:18px;background:rgba(14,16,22,.82);overflow:hidden;max-width:720px;box-shadow:0 40px 80px rgba(0,0,0,.45)}
.mail-hd{padding:16px 20px;border-bottom:1px solid rgba(255,255,255,.1);display:grid;gap:8px}
.mail-hd .from{display:flex;align-items:center;gap:10px;color:#eceef2}
.mail-hd .from img{border-radius:7px}
.mail-hd .from small{color:#7d838e;margin-left:auto}
.mail-hd .subj{font-size:var(--t-md);font-weight:800;letter-spacing:-.035em;color:#fff}
.mail-bd{padding:6px 20px 14px}
.lt-sec{padding:14px 0;border-bottom:1px solid rgba(255,255,255,.08);opacity:var(--o,1);transform:translateY(calc((1 - var(--o,1)) * 18px))}
.lt-sec:last-child{border-bottom:0}
.lt-h{display:flex;align-items:center;gap:10px;color:#eceef2;font-weight:800;margin-bottom:6px}
.lt-h b{width:24px;height:24px;border-radius:50%;background:var(--pencil-glow);color:#fff;display:grid;place-items:center;font-size:12.5px}
.letter .dx{border-top:0}
.letter .dx li{border-bottom:0}
.letter .dx li{display:grid;grid-template-columns:96px minmax(0,1fr);gap:14px;align-items:baseline;padding:5px 0}
.letter .dx .l{font-size:clamp(16px,1.5vw,21px);font-weight:700;letter-spacing:-.035em}
.letter .dx del::after{height:2px}
@media (max-width:820px){.letter .dx li{grid-template-columns:1fr;gap:2px}}

/* 패널 속 화면 모형 */
.pm.mk{display:grid;place-items:center;padding:clamp(18px,3vw,36px);background:radial-gradient(120% 90% at 20% 10%,#1a2240 0%,#0c0d12 60%)}
.mk-mail,.mk-thread,.mk-lms{width:100%;max-width:440px;border-radius:14px;background:#f4f4f1;color:#121316;overflow:hidden;box-shadow:0 30px 60px rgba(0,0,0,.5)}
.mk-bar{display:flex;align-items:center;gap:6px;padding:10px 12px;background:#e3e3dd;font-size:12px;color:#5e6168}
.mk-bar i{width:9px;height:9px;border-radius:50%;background:#c6c7c1}
.mk-bar span{margin-left:8px;font-weight:700}
.mk-li{display:grid;grid-template-columns:1fr auto;gap:2px 10px;padding:12px 14px;border-bottom:1px solid #dcdcd6;font-size:13px}
.mk-li b{font-size:12.5px} .mk-li small{color:#8d9096;grid-row:1/3;grid-column:2;align-self:center}
.mk-li span{color:#2a2c31}
.mk-li.on{background:#e6ebfb} .mk-li.on b{color:#2b4fd8}
.mk-thread{padding:6px 14px}
.mk-row{display:grid;grid-template-columns:42px minmax(0,1fr);gap:10px;padding:12px 0;border-bottom:1px solid #dcdcd6}
.mk-row:last-child{border-bottom:0}
.mk-row .vote b{font-size:13px}
.mk-row .top{display:flex;gap:6px;align-items:center;font-size:11.5px;color:#5e6168}
.mk-row h4{margin:4px 0 2px;font-size:14.5px;line-height:1.38;letter-spacing:-.03em}
.mk-row .c{font-size:12px;color:#8d9096}
.mk-player{position:relative;aspect-ratio:16/9;background:#000}
.mk-player img{width:100%;height:100%;object-fit:cover;opacity:.85}
.mk-player .play{position:absolute;left:50%;top:50%;width:52px;height:52px;margin:-26px;border-radius:50%;background:rgba(255,255,255,.9)}
.mk-player .play::after{content:"";position:absolute;left:21px;top:16px;border-left:15px solid #121316;border-top:10px solid transparent;border-bottom:10px solid transparent}
.mk-prog{display:flex;align-items:center;gap:10px;padding:10px 14px;font-size:12px;font-weight:700}
.mk-prog i{flex:1;height:6px;border-radius:9px;background:#dcdcd6;position:relative;overflow:hidden}
.mk-prog i::after{content:"";position:absolute;inset:0 auto 0 0;width:var(--w);background:#2b4fd8;border-radius:9px}
.mk-lms ol{list-style:none;margin:0;padding:0 14px 12px;display:grid;gap:2px}
.mk-lms li{display:flex;gap:10px;align-items:center;font-size:13px;padding:7px 0;color:#5e6168}
.mk-lms li span{width:22px;height:22px;border-radius:50%;display:grid;place-items:center;background:#e3e3dd;font-size:11px;font-weight:800}
.mk-lms li.done span{background:#2b4fd8;color:#fff}
.mk-lms li.now{color:#121316;font-weight:800}
.mk-lms li.now span{background:#121316;color:#fff}
.panel3 .sub-form{margin-top:auto}
.light-zone .top10 .rk{-webkit-text-stroke-color:var(--ink)}

/* v3.1 배치 보정 */
.stage{align-items:center!important;padding:110px 0 70px!important}
.stage h1{font-size:clamp(40px,6.2vw,100px)!important}
.letter{align-items:start!important;padding-top:92px}
.letter h2{font-size:clamp(28px,3.4vw,48px)!important}
.letter .sub{margin-bottom:16px!important}
.mail-hd{padding:12px 18px}.mail-bd{padding:2px 18px 10px}
.lt-sec{padding:9px 0}
.letter .dx li{padding:2px 0}
.letter .dx .l{font-size:clamp(15px,1.3vw,18px)}
.lt-h{margin-bottom:3px}
/* v3.2 첫 화면 백지 방지: 제목 줄만 움직이고 나머지는 처음부터 보인다 */
.stage-lede,.stage-form,.pillars{opacity:1!important;transform:none!important}
.letter{padding-top:84px}
.letter h2{margin-bottom:2px!important}
.mail{max-height:calc(100vh - 220px);overflow:hidden}
.stage>.wrap{width:100%}
.stage-form{flex-wrap:wrap;align-items:center}
.stage-form .sub-form{flex:0 1 560px;flex-wrap:nowrap}
.stage-form .sub-form input{min-width:0}
@media (max-width:640px){.stage-form .sub-form{flex-wrap:wrap}.stage-form .sub-form .btn{width:100%}}