/* =========================================================
   시안 D — 책으로 바라보는 세상 (토스식 스크롤 스토리텔링)
   ========================================================= */
:root{
  --ink:#191f28;--ink2:#333d4b;--sub:#4e5968;--mute:#8b95a1;--faint:#b0b8c1;--line:#e5e8eb;
  --gray:#f2f4f6;--gray2:#f9fafb;
  --blue:#3182f6;--blue-d:#1b64da;--blue-l:#e8f3ff;
  --paper:#fffdf7;--navy:#17264f;
  --shadow:0 12px 40px rgba(2,32,71,.10);
  --shadow-s:0 6px 20px rgba(2,32,71,.08);
  --gnb:64px;
  --side:clamp(20px,5vw,72px);
}
*{box-sizing:border-box;margin:0;padding:0}
html{-webkit-text-size-adjust:100%}
html.lenis,html.lenis body{height:auto}
.lenis.lenis-smooth{scroll-behavior:auto!important}
body{font-family:"Pretendard Variable",Pretendard,-apple-system,BlinkMacSystemFont,system-ui,sans-serif;color:var(--ink);background:#fff;word-break:keep-all;-webkit-font-smoothing:antialiased;overflow-x:hidden}
img{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font:inherit;color:inherit}
button{border:0;background:none;cursor:pointer}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}

.eyebrow{font-size:15px;font-weight:700;color:var(--blue);letter-spacing:-.01em;margin-bottom:14px}
.h2{font-size:clamp(30px,3.4vw,52px);line-height:1.3;font-weight:700;letter-spacing:-.035em}
.lead{font-size:clamp(16px,1.2vw,19px);line-height:1.7;color:var(--sub);letter-spacing:-.01em}
.pill{display:inline-flex;align-items:center;gap:10px;height:40px;padding:0 8px 0 18px;border-radius:999px;background:var(--gray);font-size:15px;font-weight:600;color:var(--ink2);transition:background .2s}
.pill:hover{background:#e5e8eb}
.pill i{width:24px;height:24px;border-radius:50%;background:var(--ink);color:#fff;display:grid;place-items:center;font-style:normal;font-size:12px}

/* ---------- GNB ---------- */
.gnb{position:fixed;inset:0 0 auto;height:var(--gnb);z-index:100;display:flex;align-items:center;gap:32px;padding:0 var(--side);background:rgba(255,255,255,.78);-webkit-backdrop-filter:saturate(180%) blur(16px);backdrop-filter:saturate(180%) blur(16px);transition:background .4s,color .4s,box-shadow .4s}
.logo{display:flex;align-items:center;gap:8px;font-size:18px;font-weight:800;letter-spacing:-.03em}
.logo .mark{width:26px;height:26px;border-radius:8px;background:linear-gradient(135deg,#4f9bff,#1b64da);position:relative;flex:0 0 auto}
.logo .mark::after{content:"";position:absolute;inset:7px 6px;border:2px solid #fff;border-top:0;border-radius:0 0 6px 6px}
.logo .mark::before{content:"";position:absolute;left:12px;top:6px;width:2px;height:12px;background:#fff;border-radius:2px}
.logo small{font-size:14px;font-weight:600;color:var(--mute);transition:color .4s}
.gnb nav{display:flex;gap:28px;margin-left:auto;font-size:15px;font-weight:500;color:var(--ink2);transition:color .4s}
.gnb nav a:hover{color:var(--blue)}
.gnb-cta{height:36px;padding:0 16px;border-radius:10px;background:var(--blue);color:#fff;font-size:14px;font-weight:700;display:inline-flex;align-items:center;transition:background .2s}
.gnb-cta:hover{background:var(--blue-d)}
body.is-dark .gnb{background:rgba(8,10,18,.32);color:#fff}
body.is-dark .gnb nav{color:rgba(255,255,255,.82)}
body.is-dark .logo small{color:rgba(255,255,255,.6)}

/* ---------- 좌측 진행 눈금 (토스) ---------- */
.ticks{position:fixed;left:18px;top:50%;transform:translateY(-50%);z-index:90;display:flex;flex-direction:column;gap:7px;pointer-events:none}
.ticks i{display:block;width:8px;height:2px;border-radius:2px;background:rgba(25,31,40,.16);transition:width .3s,background .3s}
.ticks i.on{width:14px;background:rgba(25,31,40,.75)}
.ticks i.near{width:11px;background:rgba(25,31,40,.38)}
body.is-dark .ticks i{background:rgba(255,255,255,.2)}
body.is-dark .ticks i.on{background:#fff}
body.is-dark .ticks i.near{background:rgba(255,255,255,.5)}

/* ---------- 01 HERO ---------- */
.hero-stage{position:relative;height:100vh;overflow:hidden;background:#fff;--hx:calc(20px + clamp(28px,4vw,64px));--hy:calc(20px + clamp(36px,6.5vh,72px))}
.hero-media{position:absolute;inset:0;clip-path:inset(76px 20px 20px 20px round 32px);overflow:hidden}
.hero-media img{width:100%;height:100%;object-fit:cover;object-position:50% 40%;transform:scale(1.12)}
.hero-shade{position:absolute;inset:0;background:linear-gradient(180deg,rgba(0,0,0,.06) 0%,rgba(0,0,0,0) 40%,rgba(0,0,0,.55) 100%)}
.hero-title{position:absolute;left:var(--hx);bottom:var(--hy);display:flex;flex-direction:column;align-items:flex-start;color:#fff;font-size:clamp(40px,5.2vw,84px);font-weight:700;letter-spacing:-.045em;line-height:1.14;text-shadow:0 2px 30px rgba(0,0,0,.18)}
.hero-title span{display:block;overflow:hidden;padding-bottom:.04em}
.hero-title em{display:block;font-style:normal}
.hero-title .k{font-size:clamp(13px,1vw,16px);font-weight:600;letter-spacing:.14em;opacity:.85;margin-bottom:clamp(12px,1.6vh,20px)}
.hero-meta{position:absolute;right:var(--hx);bottom:var(--hy);display:flex;flex-direction:column;align-items:flex-end;gap:22px;color:#fff;text-align:right}
.hero-meta p{font-size:15px;line-height:1.7;opacity:.85}
.hero-meta .cue{display:flex;align-items:center;gap:12px;font-size:12px;font-weight:700;letter-spacing:.24em;opacity:.85}
.hero-meta .cue i{position:relative;width:56px;height:1px;background:rgba(255,255,255,.35);overflow:hidden}
.hero-meta .cue i::after{content:"";position:absolute;inset:0;background:#fff;animation:cue 2s cubic-bezier(.6,0,.2,1) infinite}
@keyframes cue{0%{transform:translateX(-100%)}60%,100%{transform:translateX(100%)}}
.hero-sub{position:absolute;left:0;right:0;top:50%;transform:translateY(-50%);text-align:center;color:#fff;padding:0 24px;opacity:0}
.hero-sub p{font-size:clamp(16px,1.4vw,20px);font-weight:500;opacity:.85;margin-bottom:14px}
.hero-sub strong{display:block;font-size:clamp(30px,4.2vw,64px);font-weight:700;letter-spacing:-.04em;line-height:1.25}

/* ---------- 02 INTRO (채워지는 문장) ---------- */
.intro{padding:clamp(140px,24vh,260px) 24px 40px;text-align:center}
.fill-line{position:relative;display:block;width:fit-content;margin:0 auto;font-size:clamp(28px,4vw,62px);font-weight:700;letter-spacing:-.045em;line-height:1.4;color:#d6dbe1}
.fill-line b{font-weight:inherit}
.fl-top{position:absolute;inset:0;color:var(--ink);clip-path:inset(0 100% 0 0);white-space:nowrap}
.fl-top b{color:var(--blue)}
.intro .lead{margin-top:36px}

/* ---------- 03 BOOK (선 → 세운 책 → 회전 → 펼침 → 화면) ---------- */
.book-stage{position:relative;height:100vh;overflow:hidden;background:#fff;perspective:2200px}
.book-line{position:absolute;left:50%;top:50%;width:2px;height:60vh;border-radius:3px;background:#c9ced6}
.book-zoom{position:absolute;left:50%;top:50%;width:calc(var(--bw,360px)*2);height:var(--bh,480px);margin-left:calc(var(--bw,360px)*-1);margin-top:calc(var(--bh,480px)/-2);transform-style:preserve-3d;--ph:var(--bh,480px);--pw:var(--bw,360px)}
.book-shadow{position:absolute;left:54%;right:4%;bottom:-7%;height:10%;background:radial-gradient(50% 50% at 50% 50%,rgba(20,30,60,.28),rgba(20,30,60,0));filter:blur(8px);opacity:0}
.book-right{position:absolute;left:50%;top:0;width:50%;height:100%;transform-style:preserve-3d}
.book3d{position:absolute;inset:0;transform-style:preserve-3d;visibility:hidden}
.bface{position:absolute;-webkit-backface-visibility:hidden;backface-visibility:hidden}
.b-back{inset:0;transform:rotateY(180deg) translateZ(calc(var(--bt,40px)/2));border-radius:14px 3px 3px 14px;background:radial-gradient(120% 90% at 70% 20%,#2a3f7a 0%,#17264f 55%,#101b3a 100%);color:#f1d79a;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;padding:12%}
.b-back::after{content:"";position:absolute;inset:0 0 0 auto;width:7%;background:linear-gradient(270deg,rgba(0,0,0,.35),rgba(255,255,255,.06) 60%,rgba(0,0,0,.15))}
.bb-quote{font-family:"Noto Serif KR",serif;font-size:calc(var(--bh,480px)*.03);line-height:1.9;font-weight:500;opacity:.92}
.bb-pub{margin-top:10%;font-size:calc(var(--bh,480px)*.022);letter-spacing:.2em;opacity:.65}
.bb-code{position:absolute;right:11%;bottom:8%;width:26%;height:7%;border-radius:2px;background:repeating-linear-gradient(90deg,#111 0 2px,#fff 2px 3px,#111 3px 4px,#fff 4px 7px);border:4px solid #fff}
.b-spine{top:0;height:100%;width:var(--bt,40px);left:calc(50% - var(--bt,40px)/2);transform:rotateY(-90deg) translateZ(calc(var(--bw,360px)/2));background:linear-gradient(90deg,#0e1836,#24386f 45%,#1a2a58 70%,#0e1836);color:#f1d79a;display:flex;flex-direction:column;align-items:center;justify-content:space-between;padding:calc(var(--bh,480px)*.08) 0 calc(var(--bh,480px)*.06)}
.b-spine::before,.b-spine::after{content:"";position:absolute;left:0;right:0;height:2px;background:rgba(241,215,154,.6)}
.b-spine::before{top:5%}.b-spine::after{bottom:4%}
.spine-title{writing-mode:vertical-rl;font-family:"Noto Serif KR",serif;font-weight:700;font-size:calc(var(--bt,40px)*.42);letter-spacing:.24em}
.spine-pub{writing-mode:vertical-rl;font-size:calc(var(--bt,40px)*.2);letter-spacing:.2em;opacity:.7;font-weight:600}
.b-fore{top:1.5%;height:97%;width:var(--bt,40px);left:calc(50% - var(--bt,40px)/2);transform:rotateY(90deg) translateZ(calc(var(--bw,360px)/2 - 3px));background:repeating-linear-gradient(90deg,#e9e1cc 0 1px,#fffdf7 1px 3px)}
.b-top,.b-bottom{left:0;width:calc(100% - 3px);height:var(--bt,40px);top:calc(50% - var(--bt,40px)/2);background:repeating-linear-gradient(0deg,#e9e1cc 0 1px,#fffdf7 1px 3px)}
.b-top{transform:rotateX(90deg) translateZ(calc(var(--bh,480px)/2 - 2px))}
.b-bottom{transform:rotateX(-90deg) translateZ(calc(var(--bh,480px)/2 - 2px))}
.page-base{position:absolute;left:0;top:0;width:100%;height:100%;background:var(--paper);border-radius:3px 14px 14px 3px;overflow:hidden;box-shadow:3px 3px 0 -1px #efe9da,6px 6px 0 -2px #e6dfcc,8px 9px 20px rgba(20,30,60,.18)}
.page-base img{width:100%;height:100%;object-fit:cover}
.page-base .spine{position:absolute;inset:0 auto 0 0;width:14%;background:linear-gradient(90deg,rgba(60,40,10,.2),rgba(60,40,10,0))}
.leaf{position:absolute;inset:0;transform-origin:left center;transform-style:preserve-3d}
.face{position:absolute;inset:0;-webkit-backface-visibility:hidden;backface-visibility:hidden;border-radius:3px 14px 14px 3px;overflow:hidden}
.face.back{transform:rotateY(180deg);border-radius:14px 3px 3px 14px}
.paper{background:var(--paper);color:#3b3427}
.paper::after{content:"";position:absolute;inset:0;pointer-events:none;opacity:var(--shade,1);background:linear-gradient(90deg,rgba(60,40,10,.1),rgba(60,40,10,0) 12%)}
.face.back.paper::after{background:linear-gradient(270deg,rgba(60,40,10,.1),rgba(60,40,10,0) 12%)}

.cover-front{background:radial-gradient(120% 90% at 30% 20%,#2a3f7a 0%,#17264f 55%,#101b3a 100%);color:#f1d79a;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;padding:12%}
.cover-front::before{content:"";position:absolute;inset:0 auto 0 0;width:7%;background:linear-gradient(90deg,rgba(0,0,0,.35),rgba(255,255,255,.06) 60%,rgba(0,0,0,.15))}
.cover-front::after{content:"";position:absolute;inset:5%;border:1px solid rgba(241,215,154,.45);border-radius:6px 10px 10px 6px}
.cover-front svg{width:44%;height:auto;margin-bottom:9%}
.cover-front .ct{font-family:"Noto Serif KR",serif;font-size:calc(var(--bh,480px)*.064);font-weight:700;letter-spacing:-.02em;line-height:1.3}
.cover-front .cs{margin-top:5%;font-size:calc(var(--bh,480px)*.024);letter-spacing:.24em;font-weight:600;opacity:.8}
.cover-front .cv{position:absolute;bottom:9%;font-size:calc(var(--bh,480px)*.022);letter-spacing:.2em;opacity:.65}

/* 속표지 (첫 장 왼쪽) */
.title-page{display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;padding:14% 12%}
.title-page small{font-size:calc(var(--bh,480px)*.019);letter-spacing:.3em;color:#a08f6a;font-weight:600}
.tp-rule{display:block;width:28px;height:1px;background:#cbbd99;margin:7% auto}
.title-page h4{font-family:"Noto Serif KR",serif;font-size:calc(var(--bh,480px)*.058);font-weight:700;color:#221d14;letter-spacing:-.02em}
.title-page p{margin-top:5%;font-size:calc(var(--bh,480px)*.026);line-height:1.8;color:#6b5f48}
.title-page .imprint{position:absolute;bottom:9%;left:0;right:0;font-size:calc(var(--bh,480px)*.019);letter-spacing:.12em;color:#a08f6a}

/* 사이트 목차 (첫 장 오른쪽) */
.toc{padding:12% 11% 10%;display:flex;flex-direction:column}
.toc-h{display:flex;align-items:baseline;justify-content:space-between;padding-bottom:5%;margin-bottom:7%;border-bottom:1px solid #e6dcc4}
.toc-h b{font-family:"Noto Serif KR",serif;font-size:calc(var(--bh,480px)*.046);color:#221d14}
.toc-h small{font-size:calc(var(--bh,480px)*.018);letter-spacing:.24em;color:#a08f6a;font-weight:600}
.toc ol{list-style:none;display:flex;flex-direction:column;gap:calc(var(--bh,480px)*.02)}
.toc a{display:flex;align-items:baseline;gap:6px;font-size:max(9px,calc(var(--bh,480px)*.028));font-weight:600;color:#3b3427;transition:color .2s}
.toc a small{width:2.1em;flex:0 0 auto;color:#b3a37f;font-weight:700;font-size:.82em}
.toc a::after{content:"";flex:1;order:2;margin:0 4px;border-bottom:1px dotted #d4c7a6}
.toc a em{order:3;font-style:normal;color:#a08f6a;font-weight:500;font-size:.9em}
.toc a:hover{color:var(--blue-d)}

/* 문구 페이지 (둘째 장 왼쪽 → 화면 가득일 때 왼쪽 절반) */
.text-page{display:flex;flex-direction:column;justify-content:center;padding:0 12%}
.tp-eye{font-size:clamp(10px,calc(var(--ph)*.024),16px);font-weight:700;color:var(--blue);letter-spacing:.02em;margin-bottom:1em}
.text-page h3{font-family:"Noto Serif KR",serif;font-size:clamp(16px,min(calc(var(--ph)*.058),calc(var(--pw)*.088)),56px);line-height:1.38;font-weight:700;color:#221d14;letter-spacing:-.03em}
.text-page p{margin-top:1.3em;font-size:clamp(11px,min(calc(var(--ph)*.026),calc(var(--pw)*.04)),19px);line-height:1.85;color:#5b5140}
.text-page .tp-sub{margin-top:2.2em;padding-top:1.3em;border-top:1px solid #e6dcc4;font-size:clamp(10px,min(calc(var(--ph)*.019),calc(var(--pw)*.03)),15px);color:#8a7a5a;font-weight:600}

/* ---------- 04 SUBJECTS ---------- */
.subjects{background:#fff}
.subj-stage{height:100vh;display:grid;grid-template-columns:minmax(0,5fr) minmax(0,6fr);gap:clamp(32px,6vw,110px);align-items:center;max-width:1320px;margin:0 auto;padding:calc(var(--gnb) + 20px) var(--side) 32px}
.subj-list{list-style:none;margin-top:clamp(24px,4.5vh,48px);border-left:2px solid var(--line)}
.subj-list li{position:relative;padding:clamp(10px,1.6vh,16px) 0 clamp(10px,1.6vh,16px) 26px;cursor:pointer}
.subj-list li::before{content:"";position:absolute;left:-2px;top:0;bottom:0;width:2px;background:var(--ink);transform:scaleY(0);transform-origin:top;transition:transform .6s cubic-bezier(.2,.8,.2,1)}
.subj-list li.is-active::before{transform:scaleY(1)}
.subj-list .tag{font-size:14px;font-weight:600;color:var(--faint);transition:color .4s}
.subj-list h3{font-size:clamp(21px,1.8vw,28px);font-weight:700;letter-spacing:-.03em;color:var(--faint);transition:color .4s}
.subj-list li.is-active .tag{color:var(--blue)}
.subj-list li.is-active h3{color:var(--ink)}
.subj-more{display:grid;grid-template-rows:0fr;transition:grid-template-rows .6s cubic-bezier(.2,.8,.2,1)}
.subj-more>div{overflow:hidden}
.subj-list li.is-active .subj-more{grid-template-rows:1fr}
.subj-more p{font-size:clamp(15px,1.1vw,17px);line-height:1.7;color:var(--sub);padding-top:10px;max-width:440px}
.chips{display:flex;flex-wrap:wrap;gap:6px;margin:16px 0 28px}
.chips i{font-style:normal;font-size:13px;font-weight:600;color:var(--sub);background:var(--gray);border-radius:8px;padding:5px 10px}
.subj-visual{position:relative;height:min(70vh,680px);width:100%}
.subj-photo{position:absolute;inset:0;border-radius:32px;overflow:hidden;opacity:0;transition:opacity .7s ease}
.subj-photo img{width:100%;height:100%;object-fit:cover;transform:scale(1.08);transition:transform 1.4s cubic-bezier(.2,.8,.2,1)}
.subj-photo.is-active{opacity:1}
.subj-photo.is-active img{transform:scale(1)}
.fc-group{position:absolute;inset:0;pointer-events:none}
.fc{position:absolute;background:rgba(255,255,255,.94);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);border-radius:22px;box-shadow:0 18px 50px rgba(2,32,71,.16);padding:16px 20px;display:flex;align-items:center;gap:14px;opacity:0;transform:translateY(24px) scale(.96);transition:opacity .5s,transform .7s cubic-bezier(.2,.8,.2,1)}
.fc-group.is-active .fc{opacity:1;transform:none}
.fc-group.is-active .fc:nth-child(2){transition-delay:.12s}
.fc.a{left:-6%;bottom:12%}
.fc.b{right:-4%;top:9%}
.fc .ic{width:44px;height:44px;border-radius:14px;display:grid;place-items:center;font-weight:800;font-size:16px;flex:0 0 auto}
.fc small{display:block;font-size:13px;color:var(--mute);font-weight:500}
.fc strong{display:block;font-size:17px;font-weight:700;letter-spacing:-.02em;color:var(--ink)}
.fc strong em{font-style:normal;color:var(--blue)}
.fc .check{width:22px;height:22px;border-radius:50%;background:var(--blue);color:#fff;display:grid;place-items:center;font-size:12px;margin-left:6px}
.fc .meter{width:120px;height:6px;border-radius:6px;background:var(--gray);overflow:hidden;margin-top:8px}
.fc .meter b{display:block;height:100%;width:78%;background:var(--blue);border-radius:6px}
.fc svg.ring{width:44px;height:44px}

/* ---------- 05 ART (큰 붓질로 칠해지며 넘어감) ---------- */
.art-stage{position:relative;height:100vh;overflow:hidden;background:#fff}
.paint{position:absolute;inset:0;pointer-events:none}
.stroke{position:absolute;background:var(--c);--x:100%;clip-path:inset(3px);
  -webkit-mask-image:var(--s),url(../img/d/paint/edge.webp);mask-image:var(--s),url(../img/d/paint/edge.webp);
  -webkit-mask-size:100% 100%,270% 100%;mask-size:100% 100%,270% 100%;
  -webkit-mask-repeat:no-repeat;mask-repeat:no-repeat;
  -webkit-mask-position:0 0,var(--x) 0;mask-position:0 0,var(--x) 0;
  -webkit-mask-composite:source-in;mask-composite:intersect}
.stroke i{position:absolute;inset:0;background:var(--s) 0 0/100% 100% no-repeat;mix-blend-mode:multiply;opacity:.5}
.stroke{transform-origin:50% 50%}
.st1{left:-8vw;top:24vh;width:96vw;height:62vh;--r:-16deg}
.st2{left:-30vw;top:-24vh;width:170vw;height:78vh;--r:9deg;--f:-1}
.st3{left:-30vw;top:36vh;width:170vw;height:84vh;--r:-10deg}
.st4{left:-40vw;top:-6vh;width:185vw;height:118vh;--r:-5deg}
.art-inner{position:relative;z-index:2;height:100%;max-width:1280px;margin:0 auto;padding:calc(var(--gnb) + 20px) var(--side) 32px;display:grid;grid-template-columns:minmax(0,5fr) minmax(0,5fr);gap:clamp(32px,5vw,96px);align-items:center}
.art-copy{color:#fff}
.art-copy .eyebrow{color:#ffd23f}
.art-copy .lead{margin-top:18px;color:rgba(255,255,255,.86)}
.steps{list-style:none;margin-top:clamp(24px,4vh,40px);display:flex;flex-direction:column;gap:12px}
.steps li{display:flex;align-items:center;gap:14px;font-size:clamp(16px,1.2vw,18px);font-weight:600;color:#fff}
.steps li b{width:30px;height:30px;border-radius:50%;background:#ffd23f;color:var(--ink);display:grid;place-items:center;font-size:13px;flex:0 0 auto}
.art-visual{position:relative;height:min(64vh,600px)}
.art-photo{position:absolute;right:0;top:0;width:78%;border:10px solid #fff;border-radius:26px;overflow:hidden;box-shadow:0 30px 70px rgba(0,10,60,.35);rotate:3deg}
.art-photo img{width:100%;aspect-ratio:4/3;object-fit:cover}
.art-photo2{position:absolute;left:0;bottom:0;width:50%;border:8px solid #fff;border-radius:22px;overflow:hidden;box-shadow:0 24px 60px rgba(0,10,60,.35);rotate:-5deg}
.art-photo2 img{width:100%;aspect-ratio:1;object-fit:cover;object-position:30% 50%}
.art-chip{position:absolute;right:4%;bottom:14%;background:#fff;color:var(--ink);border-radius:16px;padding:12px 16px;font-size:14px;font-weight:600;box-shadow:var(--shadow)}
.art-chip small{display:block;font-size:12px;opacity:.6;font-weight:500}

/* ---------- 06 MUSIC (검은 화면 위 오선지, 흐르는 음계) ---------- */
.art-hole{position:absolute;left:50%;top:50%;width:10px;height:10px;margin:-5px 0 0 -5px;border-radius:50%;background:#000;z-index:5;transform:scale(0)}
.music-stage{position:relative;height:100vh;overflow:hidden;background:#000;color:#fff;--g:clamp(14px,2.3vh,24px)}
.mu-copy{position:absolute;top:calc(var(--gnb) + 6vh);left:0;right:0;text-align:center;padding:0 24px;z-index:2}
.mu-copy .eyebrow{color:#ffd23f}
.mu-copy .lead{color:rgba(255,255,255,.7);margin-top:12px}
.staff{position:absolute;left:0;right:0;top:58%;height:calc(var(--g)*4);transform:translateY(-50%)}
.sl{position:absolute;left:0;right:0;height:1.5px;background:rgba(255,255,255,.5);transform-origin:0 50%;transform:scaleX(0)}
.sl:nth-child(1){top:0}.sl:nth-child(2){top:25%}.sl:nth-child(3){top:50%}.sl:nth-child(4){top:75%}.sl:nth-child(5){top:100%}
.clef{position:absolute;left:clamp(16px,5vw,80px);top:50%;font-family:"Noto Music",serif;font-size:calc(var(--g)*6.4);line-height:1;transform:translateY(-54%);color:#fff;opacity:0;z-index:3;text-shadow:0 0 30px #000,0 0 18px #000}
.playhead{position:absolute;left:38%;top:calc(var(--g)*-2.5);height:calc(var(--g)*9);width:2px;margin-left:-1px;background:linear-gradient(rgba(255,210,63,0),rgba(255,210,63,.85),rgba(255,210,63,0));opacity:0}
.track{position:absolute;left:0;top:0;height:100%;will-change:transform}
.nt{position:absolute;top:calc(var(--g)*4 - var(--k)*var(--g)/2);width:calc(var(--g)*1.4);height:var(--g);margin:calc(var(--g)/-2) 0 0 calc(var(--g)*-.7);color:rgba(255,255,255,.32);transition:color .35s,transform .35s,filter .35s}
.nt .hd{position:absolute;inset:0;border-radius:50%;background:currentColor;transform:rotate(-20deg)}
.nt::after{content:"";position:absolute;right:1px;bottom:50%;width:2px;height:calc(var(--g)*3.3);background:currentColor}
.nt.dn::after{right:auto;left:1px;bottom:auto;top:50%}
.nt.lg::before{content:"";position:absolute;left:-35%;right:-35%;top:50%;height:1.5px;margin-top:-.75px;background:rgba(255,255,255,.5)}
.nt .nm{position:absolute;left:50%;top:calc(var(--k)*var(--g)/2 + var(--g)*2.6);transform:translateX(-50%);font-size:clamp(13px,1.3vw,17px);font-weight:700;white-space:nowrap;opacity:0;transition:opacity .35s}
.nt.on{color:var(--c);filter:drop-shadow(0 0 10px var(--c))}
.nt.on .nm{opacity:1}
.nt.hit{transform:scale(1.35)}
.bar{position:absolute;top:0;height:100%;width:1.5px;background:rgba(255,255,255,.4)}
.mu-chips{position:absolute;left:0;right:0;bottom:clamp(40px,9vh,90px);display:flex;justify-content:center;flex-wrap:wrap;gap:10px;list-style:none;padding:0 16px}
.mu-chips li{padding:10px 18px;border-radius:999px;border:1px solid rgba(255,255,255,.2);background:rgba(255,255,255,.06);font-size:15px;font-weight:600;opacity:0}

/* ---------- 07 CURRICULUM (선 그래프) ---------- */
.curri{background:#fff}
.curri-stage{height:100vh;display:grid;grid-template-columns:minmax(0,4fr) minmax(0,7fr);gap:clamp(28px,5vw,88px);align-items:center;max-width:1360px;margin:0 auto;padding:calc(var(--gnb) + 20px) var(--side) 32px}
.stage-list{list-style:none;margin-top:clamp(22px,4vh,40px);display:flex;flex-direction:column;gap:6px}
.stage-list li{padding:14px 18px;border-radius:18px;transition:background .4s}
.stage-list li small{font-size:14px;font-weight:700;color:var(--faint);transition:color .4s}
.stage-list li h3{font-size:clamp(18px,1.5vw,22px);font-weight:700;color:var(--faint);letter-spacing:-.02em;transition:color .4s}
.stage-list li p{font-size:15px;line-height:1.6;color:var(--sub);max-height:0;overflow:hidden;opacity:0;transition:max-height .6s,opacity .4s,margin .4s}
.stage-list li.on{background:var(--gray2)}
.stage-list li.on small{color:var(--blue)}
.stage-list li.on h3{color:var(--ink)}
.stage-list li.on p{max-height:80px;opacity:1;margin-top:6px}
.chart-card{background:#fff;border:1px solid var(--line);border-radius:28px;padding:clamp(18px,2vw,28px) clamp(16px,2vw,28px) 18px;box-shadow:var(--shadow-s)}
.chart-top{display:flex;justify-content:space-between;align-items:flex-end;gap:12px;margin-bottom:6px}
.chart-top small{font-size:14px;color:var(--mute);font-weight:500}
.chart-top strong{display:block;font-size:clamp(20px,1.8vw,26px);font-weight:700;letter-spacing:-.03em}
.chart-top .now{text-align:right}
.chart-top .now strong{color:var(--blue)}
.curve-svg{width:100%;height:auto;display:block;overflow:visible}
.curve-svg .grid line{stroke:#eef0f3;stroke-width:1.5}
.curve-svg .gx text{font-size:15px;fill:var(--mute);text-anchor:middle;font-weight:500}
.curve-svg .ms circle{fill:#fff;stroke:var(--blue);stroke-width:4}
.curve-svg .ms text{font-size:14px;font-weight:700;fill:var(--ink2);text-anchor:middle}
.curve-svg .ms{opacity:0}
.kpis{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-top:16px}
.kpi{background:var(--gray2);border-radius:20px;padding:16px 18px}
.kpi small{font-size:13px;color:var(--mute);font-weight:500;display:block}
.kpi strong{font-size:clamp(24px,2.2vw,34px);font-weight:800;letter-spacing:-.04em;color:var(--ink)}
.kpi strong span{font-size:.55em;font-weight:700;margin-left:2px;color:var(--sub)}
.kpi p{font-size:12px;color:var(--faint);margin-top:2px}

/* ---------- 08 MOMENTS ---------- */
.mo-stage{position:relative;height:100vh;overflow:hidden;background:#fff}
.mo-head{position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);text-align:center;z-index:5;width:min(640px,90vw)}
.mo-head .h2{text-shadow:0 0 24px #fff,0 0 12px #fff}
.mo-head .lead{margin-top:14px}
.mo-item{position:absolute;border-radius:24px;overflow:hidden;box-shadow:0 20px 50px rgba(2,32,71,.14);will-change:transform}
.mo-item img{width:100%;height:100%;object-fit:cover}
.mo-quote{position:absolute;background:#fff;border-radius:22px;padding:18px 20px;box-shadow:0 16px 44px rgba(2,32,71,.14);width:clamp(220px,19vw,280px);will-change:transform}
.mo-quote p{font-size:15px;line-height:1.6;font-weight:600;color:var(--ink2)}
.mo-quote small{display:flex;align-items:center;gap:8px;margin-top:10px;font-size:13px;color:var(--mute)}
.mo-quote small::before{content:"";width:22px;height:22px;border-radius:50%;background:var(--blue-l) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Ccircle cx='12' cy='9' r='4' fill='%233182f6'/%3E%3Cpath d='M4 21c1-4 4.5-6 8-6s7 2 8 6' fill='%233182f6'/%3E%3C/svg%3E") center/16px no-repeat}

/* ---------- 09 SPACE → TEACHERS ---------- */
.space-stage{position:relative;height:100vh;overflow:hidden;background:#fff}
.space-row{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;gap:clamp(16px,2vw,32px);z-index:2}
.space-row .w{flex:0 0 auto;white-space:nowrap;font-size:clamp(30px,4.4vw,70px);font-weight:700;letter-spacing:-.045em}
.space-frame{position:relative;flex:0 0 auto;width:200px;height:260px;border-radius:26px;overflow:hidden;background:#111}
.space-frame>img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;transform:scale(1.25)}
.space-dim{position:absolute;inset:0;background:#070a12;opacity:0}
.space-info{position:absolute;left:var(--side);bottom:clamp(32px,7vh,72px);z-index:3;color:#fff;opacity:0}
.space-info h3{font-size:clamp(26px,2.8vw,42px);font-weight:700;letter-spacing:-.035em;line-height:1.3;text-shadow:0 2px 20px rgba(0,0,0,.3)}
.space-info ul{list-style:none;display:flex;flex-wrap:wrap;gap:8px;margin-top:18px}
.space-info li{font-size:14px;font-weight:600;padding:9px 14px;border-radius:999px;background:rgba(255,255,255,.18);-webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px);border:1px solid rgba(255,255,255,.25)}
.t-wrap{position:absolute;inset:0;z-index:4;display:flex;flex-direction:column;justify-content:center;align-items:center;padding:calc(var(--gnb) + 12px) var(--side) 32px;color:#fff;pointer-events:none}
.t-wrap.live{pointer-events:auto}
.t-head{text-align:center;margin-bottom:clamp(24px,4.5vh,48px);opacity:0}
.t-head .eyebrow{color:#8fbcff}
.t-head .lead{color:rgba(255,255,255,.7);margin-top:10px}
.t-row{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:clamp(10px,1.2vw,18px);width:100%;max-width:1180px}
.t-card{border-radius:22px;overflow:hidden;background:rgba(255,255,255,.07);border:1px solid rgba(255,255,255,.12);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);opacity:0}
.t-card .ph{aspect-ratio:4/5;max-height:34vh;width:100%;overflow:hidden;background:#222}
.t-card .ph img{width:100%;height:100%;object-fit:cover;object-position:50% 25%}
.t-card .bd{padding:14px 16px 16px}
.t-card .ac{font-size:12px;font-weight:700;color:#8fbcff}
.t-card h4{font-size:17px;font-weight:700;margin:2px 0 4px;letter-spacing:-.02em}
.t-card p{font-size:12.5px;line-height:1.55;color:rgba(255,255,255,.66)}

/* ---------- 10 FINALE (하늘 → 우주) ---------- */
.finale{position:relative;color:#fff;background:#03040a}
.fin-bg{position:sticky;top:0;height:100vh;margin-bottom:-100vh;overflow:hidden;z-index:0}
/* 하늘(맨 아래) → 그라데이션 → 우주(맨 위). 기둥 전체가 아래로 내려가며 하늘 위로 올라가는 느낌 */
.atmo{position:absolute;left:0;right:0;bottom:0;height:300vh;will-change:transform}
.atmo-space{position:absolute;left:0;right:0;top:0;height:101vh;background:#03040a}
.atmo-grad{position:absolute;left:0;right:0;top:100vh;height:101vh;background:linear-gradient(180deg,#03040a 0%,#050a1c 22%,#0a1840 48%,#0b2c66 72%,#00427f 100%)}
.atmo-sky{position:absolute;left:0;right:0;top:200vh;height:100vh;overflow:hidden}
.atmo-sky img{width:100%;height:100%;object-fit:cover;object-position:50% 60%}
.atmo-sky::before{content:"";position:absolute;left:0;right:0;top:0;height:28%;z-index:1;background:linear-gradient(180deg,#00427f,rgba(0,66,127,0))}
.stars{position:absolute;left:0;top:0;width:100%;height:170vh}
.cloud{position:absolute;border-radius:50%;background:radial-gradient(closest-side,rgba(255,255,255,.9),rgba(255,255,255,0));filter:blur(10px)}
.fin-ascend{position:relative;height:180vh;z-index:1}
.fin-msg{position:sticky;top:0;height:100vh;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;padding:0 24px;opacity:0}
.fin-msg .h2{font-size:clamp(34px,4.6vw,72px);text-shadow:0 4px 30px rgba(0,30,80,.35)}
.fin-msg .lead{color:rgba(255,255,255,.8);margin-top:16px}
.contact{position:relative;z-index:1;max-width:1200px;margin:0 auto;padding:clamp(60px,10vh,120px) var(--side) clamp(80px,12vh,140px);display:grid;grid-template-columns:minmax(0,5fr) minmax(0,6fr);gap:clamp(32px,5vw,88px);align-items:start}
.contact .eyebrow{color:#8fbcff}
.contact .lead{color:rgba(255,255,255,.7);margin-top:16px}
.c-info{list-style:none;margin-top:40px;display:flex;flex-direction:column;gap:2px;border-top:1px solid rgba(255,255,255,.1)}
.c-info li{display:flex;gap:20px;padding:16px 0;border-bottom:1px solid rgba(255,255,255,.1);font-size:15px}
.c-info li span{width:76px;flex:0 0 auto;color:rgba(255,255,255,.5)}
.c-info li b{font-weight:600}
.c-info li b.big{font-size:22px;font-weight:800;letter-spacing:-.02em}
.form{background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.12);border-radius:28px;padding:clamp(22px,3vw,36px);-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px);box-shadow:0 30px 80px rgba(0,0,0,.4)}
.form h3{font-size:22px;font-weight:700;letter-spacing:-.02em}
.form>p{font-size:14px;color:rgba(255,255,255,.55);margin:6px 0 22px}
.f-row{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.f{display:flex;flex-direction:column;gap:8px;margin-bottom:16px}
.f label,.f .lb{font-size:14px;font-weight:600;color:rgba(255,255,255,.72)}
.f input,.f textarea{width:100%;height:52px;border-radius:14px;border:1px solid rgba(255,255,255,.1);background:rgba(255,255,255,.07);padding:0 16px;font-size:16px;color:#fff;outline:0;transition:border-color .2s,background .2s}
.f textarea{height:92px;padding:14px 16px;resize:none;line-height:1.5}
.f input::placeholder,.f textarea::placeholder{color:rgba(255,255,255,.35)}
.f input:focus,.f textarea:focus{border-color:var(--blue);background:rgba(49,130,246,.1)}
.opt{display:flex;flex-wrap:wrap;gap:6px}
.opt button{height:38px;padding:0 14px;border-radius:12px;background:rgba(255,255,255,.07);border:1px solid rgba(255,255,255,.1);font-size:14px;font-weight:600;color:rgba(255,255,255,.8);transition:all .2s}
.opt button[aria-pressed="true"]{background:var(--blue);border-color:var(--blue);color:#fff}
.agree{display:flex;align-items:center;gap:10px;font-size:14px;color:rgba(255,255,255,.65);margin:4px 0 20px;cursor:pointer}
.agree input{width:20px;height:20px;accent-color:var(--blue)}
.submit{width:100%;height:58px;border-radius:16px;background:var(--blue);color:#fff;font-size:17px;font-weight:700;transition:background .2s,transform .2s}
.submit:hover{background:var(--blue-d)}
.submit:active{transform:scale(.98)}
.footer{position:relative;z-index:1;border-top:1px solid rgba(255,255,255,.1);padding:48px var(--side) 56px;max-width:1200px;margin:0 auto;color:rgba(255,255,255,.5);font-size:13px;line-height:1.8}
.f-top{display:flex;justify-content:space-between;flex-wrap:wrap;gap:24px;margin-bottom:28px}
.f-top .logo{color:#fff}
.f-top .logo small{color:rgba(255,255,255,.5)}
.f-links{display:flex;gap:20px;flex-wrap:wrap;color:rgba(255,255,255,.75);font-weight:600}
.f-links a:first-child{color:#fff}
.f-acad{display:flex;flex-wrap:wrap;gap:6px 18px;margin-bottom:16px;color:rgba(255,255,255,.62)}
.f-family{display:flex;gap:8px;flex-wrap:wrap;margin-top:20px}
.f-family a{padding:6px 12px;border-radius:999px;border:1px solid rgba(255,255,255,.15);color:rgba(255,255,255,.65)}
.toast{position:fixed;left:50%;bottom:32px;transform:translate(-50%,40px);z-index:200;background:#fff;color:var(--ink);border-radius:16px;padding:16px 22px;font-size:15px;font-weight:600;box-shadow:0 20px 50px rgba(0,0,0,.3);opacity:0;pointer-events:none;transition:all .4s cubic-bezier(.2,.8,.2,1);display:flex;align-items:center;gap:10px}
.toast::before{content:"✓";width:22px;height:22px;border-radius:50%;background:var(--blue);color:#fff;display:grid;place-items:center;font-size:12px}
.toast.show{opacity:1;transform:translate(-50%,0)}
.m-cta{display:none}

/* ---------- 반응형 ---------- */
@media (max-width:1100px){
  .gnb nav{display:none}
  .gnb-cta{margin-left:auto}
  .ticks{display:none}
  .t-row{grid-template-columns:repeat(5,minmax(150px,1fr));overflow-x:auto;padding-bottom:8px;scrollbar-width:none}
}
@media (max-width:767px){
  :root{--gnb:56px}
  .gnb{gap:12px}
  .logo{font-size:16px}
  .hero-stage{--hx:32px;--hy:96px}
  .hero-title{font-size:clamp(34px,10vw,46px)}
  .hero-meta{display:none}
  .subj-stage,.art-inner,.curri-stage{grid-template-columns:1fr;align-content:center;gap:20px;padding-top:calc(var(--gnb) + 12px)}
  .subj-copy{order:2}
  .subj-visual{height:34vh}
  .subj-list{margin-top:14px}
  .subj-copy .h2{font-size:26px}
  .subj-copy .eyebrow{margin-bottom:8px}
  .subj-more p{font-size:14px;padding-top:4px}
  .chips{margin:8px 0 0}
  .subj-more .pill{display:none}
  .fc{padding:10px 14px;border-radius:16px;gap:10px}
  .fc .ic{width:34px;height:34px;border-radius:10px;font-size:13px}
  .fc strong{font-size:14px}
  .fc small{font-size:11px}
  .fc.a{left:-2%;bottom:6%}
  .fc.b{right:-2%;top:6%}
  .fc .meter{width:80px}
  .art-copy .lead{display:none}
  .steps{margin-top:16px;flex-direction:row;flex-wrap:wrap;gap:8px 14px}
  .steps li{font-size:14px;gap:8px}
  .steps li b{width:24px;height:24px;font-size:11px}
  .art-chip{font-size:12px;padding:8px 12px}
  .art-visual{height:38vh}
  .art-copy .h2{font-size:26px}
  .curri-copy .lead,.stage-list li p{display:none}
  .stage-list{flex-direction:row;gap:4px;margin-top:14px}
  .stage-list li{padding:8px 10px;flex:1}
  .stage-list li h3{font-size:14px}
  .stage-list li small{font-size:12px}
  .chart-top strong{font-size:17px}
  .kpis{gap:6px}
  .kpi{padding:10px;border-radius:14px}
  .kpi p{display:none}
  .kpi small{font-size:11px}
  .kpi strong{font-size:22px}
  .mo-quote{width:200px;padding:14px}
  .mo-quote p{font-size:13px}
  .space-row .w{font-size:clamp(22px,7vw,32px)}
  .t-card .ph{max-height:none}
  .t-head{margin-bottom:20px}
  .contact{grid-template-columns:1fr}
  .f-row{grid-template-columns:1fr}
  .m-cta{display:flex;position:fixed;left:16px;right:16px;bottom:16px;z-index:95;height:54px;border-radius:16px;background:var(--blue);color:#fff;font-weight:700;font-size:16px;align-items:center;justify-content:center;box-shadow:0 12px 30px rgba(49,130,246,.4);transition:transform .4s,opacity .4s}
  .m-cta.hide{transform:translateY(90px);opacity:0}
}
@media (prefers-reduced-motion:reduce){
  .hero-meta .cue i::after{animation:none}
}
.space-thumbs{display:flex;gap:8px;margin-top:20px}
.space-thumbs img{width:clamp(84px,9vw,132px);aspect-ratio:4/3;object-fit:cover;border-radius:14px;border:2px solid rgba(255,255,255,.7);box-shadow:0 8px 24px rgba(0,0,0,.25)}
/* 콜라주 레인 */
.mo-item,.mo-quote{top:0}
.lA{left:3%}.lB{left:17.5%}.lC{left:70%}.lD{left:84%}
.mo-item.lA{width:14vw}.mo-item.lB{width:11.5vw}.mo-item.lC{width:12.5vw}.mo-item.lD{width:13vw}
.mo-quote.lB{left:15%}.mo-quote.lC{left:66%}
@media (max-width:767px){
  .lA{left:3%}.lB{left:8%}.lC{left:56%}.lD{left:60%}
  .mo-item.lA,.mo-item.lB,.mo-item.lC,.mo-item.lD{width:36vw}
  .mo-quote.lB{left:4%}.mo-quote.lC{left:40%}
  .mo-quote{width:56vw}
}
/* 단어는 같은 너비의 양쪽 레인 → 사진이 항상 정중앙 */
.space-row .w{flex:1 1 0;min-width:0;overflow:visible}
.space-row .w:first-child{text-align:right}
/* 학원 안내: 책에서 내려오는 사진 + 반전 버튼 */
.subj-photos{position:absolute;left:0;top:0;width:100%;height:100%;border-radius:32px;overflow:hidden}
.subj-photos .subj-photo{border-radius:inherit}
.subj-intro{position:absolute;inset:0;border-radius:inherit;overflow:hidden;z-index:1;pointer-events:none}
.subj-intro img{width:100%;height:100%;object-fit:cover}
.subj-more .pill{background:var(--ink);color:#fff;height:44px;padding:0 8px 0 20px}
.subj-more .pill:hover{background:var(--blue)}
.subj-more .pill i{background:#fff;color:var(--ink)}