@font-face{font-family:"FS";src:url(fonts/fs-500.woff2) format("woff2");font-weight:400 500;font-display:swap}
@font-face{font-family:"FS";src:url(fonts/fs-600.woff2) format("woff2");font-weight:600;font-display:swap}
@font-face{font-family:"FS";src:url(fonts/fs-700.woff2) format("woff2");font-weight:700;font-display:swap}
@font-face{font-family:"FS";src:url(fonts/fs-800.woff2) format("woff2");font-weight:800 900;font-display:swap}

:root{
  --coral:#FF5A4F;--blue:#2964FF;--magenta:#E8358C;--purple:#6B47DC;
  --blue-deep:#1E3FB0;--blue-50:#EEF3FF;--ink:#181818;--ink-2:#4A4A4A;--ink-3:#7A7A7A;
  --line:#E6E6E6;--surface:#F6F6F4;--paper:#FFFFFF;--ok:#13A05A;--ok-bg:#E6F6EC;--bad:#E5402F;--bad-bg:#FDECEA;
  --r:16px;--shadow:0 1px 2px rgba(0,0,0,.04),0 8px 24px rgba(0,0,0,.06);
  --top:64px;
  color-scheme:light;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{margin:0;background:var(--paper);color:var(--ink);font-family:"FS",-apple-system,BlinkMacSystemFont,"Apple SD Gothic Neo","Malgun Gothic",sans-serif;
  font-size:16px;line-height:1.6;letter-spacing:-.01em;word-break:keep-all;-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;cursor:pointer;border:0;background:none}
img{max-width:100%}
.wrap{max-width:1180px;margin:0 auto;padding:0 24px}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0)}
svg{width:20px;height:20px;fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round;stroke-linejoin:round}

/* ---------- header ---------- */
.top{position:sticky;top:0;z-index:50;height:var(--top);background:rgba(255,255,255,.92);backdrop-filter:saturate(1.4) blur(10px);border-bottom:1px solid var(--line)}
.top-in{max-width:1180px;margin:0 auto;padding:0 24px;height:100%;display:flex;align-items:center;justify-content:space-between}
.brand{display:flex;align-items:center;gap:10px}
.brand-mark{display:grid;place-items:center;width:38px;height:38px;border-radius:10px;background:var(--coral);color:#fff;font-weight:800;font-size:14px;letter-spacing:-.02em}
.brand-txt{font-weight:700;font-size:16px}
.brand-txt b{color:var(--coral);margin-left:4px;font-weight:800}
.nav{display:flex;gap:4px}
.nav a{padding:8px 14px;border-radius:999px;font-weight:600;color:var(--ink-2);font-size:15px}
.nav a:hover{background:var(--surface)}
.nav a.on{background:var(--ink);color:#fff}

/* ---------- views ---------- */
.view{display:none}
.view.on{display:block}

/* ---------- home ---------- */
.hero{display:grid;grid-template-columns:1.15fr .85fr;gap:48px;align-items:center;padding-top:72px;padding-bottom:56px}
.eyebrow{color:var(--blue);font-weight:600;font-size:15px;margin:0 0 14px}
h1{font-size:clamp(36px,5.2vw,62px);line-height:1.16;letter-spacing:-.035em;margin:0 0 20px;font-weight:800}
h1 em{font-style:normal;color:var(--coral)}
.lead{font-size:18px;color:var(--ink-2);margin:0 0 28px}
.lead b{color:var(--ink)}
.cta{display:flex;gap:10px;flex-wrap:wrap;margin-bottom:36px}
.btn{display:inline-flex;align-items:center;justify-content:center;height:52px;padding:0 26px;border-radius:999px;font-weight:700;font-size:16px;transition:transform .15s,box-shadow .15s}
.btn-primary{background:var(--coral);color:#fff;box-shadow:0 6px 18px rgba(255,90,79,.32)}
.btn-primary:hover{transform:translateY(-1px);box-shadow:0 10px 24px rgba(255,90,79,.38)}
.btn-ghost{border:1.5px solid var(--ink);color:var(--ink)}
.btn-ghost:hover{background:var(--ink);color:#fff}
.stats{display:flex;gap:32px;margin:0;flex-wrap:wrap}
.stats div{display:flex;flex-direction:column-reverse}
.stats dt{font-size:13px;color:var(--ink-3)}
.stats dd{margin:0;font-size:30px;font-weight:800;letter-spacing:-.02em;line-height:1.2}
.hero-book{display:flex;justify-content:center;perspective:1600px}
.book3d{position:relative;width:min(340px,80%);aspect-ratio:595/842;transform:rotateY(-14deg) rotateX(4deg);transform-style:preserve-3d;transition:transform .5s cubic-bezier(.2,.7,.2,1)}
.hero-book:hover .book3d{transform:rotateY(-4deg) rotateX(2deg) translateY(-4px)}
.book3d-cover{position:absolute;inset:0;border-radius:4px 10px 10px 4px;background:#fff center/cover no-repeat;
  box-shadow:inset 6px 0 10px -6px rgba(0,0,0,.25),24px 30px 50px rgba(20,30,60,.22),4px 6px 14px rgba(0,0,0,.12)}
.book3d-cover::after{content:"";position:absolute;inset:0;border-radius:inherit;background:linear-gradient(100deg,rgba(255,255,255,0) 60%,rgba(255,255,255,.35) 75%,rgba(255,255,255,0) 90%)}
.book3d-edge{position:absolute;top:6px;bottom:6px;right:-10px;width:12px;border-radius:0 6px 6px 0;background:repeating-linear-gradient(90deg,#f1f1f1 0 1px,#dcdcdc 1px 2px);transform:translateZ(-1px)}

.entries{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;padding-bottom:24px}
.entry{position:relative;display:flex;flex-direction:column;padding:26px 26px 22px;border-radius:var(--r);background:var(--surface);border-top:4px solid var(--c);transition:transform .15s,box-shadow .15s}
.entry:hover{transform:translateY(-3px);box-shadow:var(--shadow);background:#fff}
.entry-no{font-weight:800;color:var(--c);font-size:14px}
.entry h3{margin:6px 0 8px;font-size:22px;letter-spacing:-.02em}
.entry p{margin:0 0 16px;color:var(--ink-2);font-size:15px;flex:1}
.entry-go{font-weight:700;color:var(--c);font-size:15px}

.sec{padding-top:64px;padding-bottom:16px}
.sec-head{max-width:720px;margin-bottom:28px}
.sec-head h2{font-size:32px;letter-spacing:-.03em;margin:0 0 10px;font-weight:800}
.sec-head p{margin:0;color:var(--ink-2);font-size:17px}
.sec-head b{color:var(--ink)}
.cats{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.cat{display:flex;flex-direction:column;border-radius:var(--r);overflow:hidden;border:1px solid var(--line);background:#fff;transition:transform .15s,box-shadow .15s}
.cat:hover{transform:translateY(-3px);box-shadow:var(--shadow)}
.cat-img{aspect-ratio:1168/880;background:#fafafa center/cover no-repeat;border-bottom:3px solid var(--c)}
.cat-b{padding:14px 16px 16px;display:flex;flex-direction:column;flex:1}
.cat-n{font-size:13px;font-weight:700;color:var(--c)}
.cat-t{font-size:18px;font-weight:800;letter-spacing:-.02em;margin:2px 0 6px}
.cat-w{font-size:14px;color:var(--ink-2);margin:0 0 12px;flex:1;line-height:1.5}
.cat-a{display:flex;gap:6px}
.cat-a a{flex:1;text-align:center;font-size:13px;font-weight:700;padding:8px 0;border-radius:10px;background:var(--surface)}
.cat-a a:hover{background:var(--c);color:#fff}

.compare{display:grid;grid-template-columns:1fr 1.6fr;gap:16px;padding-bottom:40px}
.cmp{border-radius:var(--r);padding:26px}
.cmp p{margin:0;font-size:17px;line-height:1.75}
.cmp-tag{display:inline-block;font-size:13px;font-weight:700;padding:4px 10px;border-radius:999px;margin-bottom:12px}
.cmp-a{background:var(--surface)}
.cmp-a .cmp-tag{background:#e3e3e3;color:var(--ink-2)}
.cmp-a p{color:var(--ink-2)}
.cmp-b{background:var(--blue-50)}
.cmp-b .cmp-tag{background:var(--blue);color:#fff}
.cmp-b mark{background:none;color:var(--blue-deep);font-weight:700;box-shadow:inset 0 -.45em 0 rgba(41,100,255,.14)}

/* ---------- footer ---------- */
.foot{border-top:1px solid var(--line);margin-top:40px;padding:28px 0 32px;font-size:14px;color:var(--ink-3)}
.foot b{color:var(--ink)}
.foot-in{display:flex;justify-content:space-between;gap:24px;flex-wrap:wrap}
.foot-legal{text-align:right}
body.r-book .foot{display:none}

/* ---------- book ---------- */
body.r-book{background:#E9E8E4}
#v-book{position:relative;background:radial-gradient(120% 90% at 50% 30%,#F4F3F0 0%,#E4E2DD 70%,#DAD8D2 100%);min-height:calc(100vh - var(--top))}
.book-stage{display:flex;justify-content:center;align-items:center;padding:24px 16px 8px;min-height:calc(100vh - var(--top) - 72px)}
.book-holder{position:relative}
.book-holder .stf__wrapper{width:100%;height:100%}
.pg{background:#fff center/100% 100% no-repeat}
.page{background-color:#fff}
.page .pg{position:absolute;inset:0}
.page .pg::before{content:"";position:absolute;inset:0;background:linear-gradient(90deg,rgba(0,0,0,.07),rgba(0,0,0,0) 7%)}
.page.--right .pg::before{background:linear-gradient(90deg,rgba(0,0,0,.09),rgba(0,0,0,0) 6%)}
.page.--left .pg::before{background:linear-gradient(270deg,rgba(0,0,0,.09),rgba(0,0,0,0) 6%)}
.book-holder.solo .page .pg::before{display:none}
.stf__parent{filter:drop-shadow(0 18px 30px rgba(40,35,25,.18))}
.book-bar{position:sticky;bottom:0;display:flex;align-items:center;justify-content:center;gap:8px;padding:12px 16px 18px;flex-wrap:wrap}
.ib,.tb{height:44px;border-radius:999px;background:#fff;box-shadow:0 1px 3px rgba(0,0,0,.12);display:inline-flex;align-items:center;justify-content:center}
.ib{width:44px}
.tb{padding:0 16px;gap:6px;font-weight:600;font-size:14px}
.ib:hover,.tb:hover{background:var(--ink);color:#fff}
.ib:disabled{opacity:.35;pointer-events:none}
.bk-pos{min-width:96px;text-align:center;font-weight:700;font-variant-numeric:tabular-nums}
.bk-sep{width:8px}
.bk-toc select{height:44px;border-radius:999px;border:0;background:#fff;box-shadow:0 1px 3px rgba(0,0,0,.12);padding:0 36px 0 16px;font:inherit;font-weight:600;font-size:14px;max-width:240px;
  appearance:none;-webkit-appearance:none;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23181818' stroke-width='2'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right 12px center;background-size:16px}
.zoom{position:fixed;inset:0;z-index:80;background:rgba(24,24,24,.92);overflow:auto;-webkit-overflow-scrolling:touch}
.zoom[hidden]{display:none}
.zoom-ctl{position:fixed;top:14px;right:16px;z-index:2;display:flex;align-items:center;gap:6px;background:#fff;border-radius:999px;padding:4px;box-shadow:0 4px 14px rgba(0,0,0,.3)}
.zoom-ctl button{min-width:38px;height:38px;border-radius:999px;font-weight:800;font-size:18px}
.zoom-ctl button:hover{background:var(--surface)}
#zoom-lv{min-width:44px;text-align:center;font-weight:700;font-size:13px;font-variant-numeric:tabular-nums}
.zoom-x{font-size:14px!important;padding:0 14px;background:var(--ink)!important;color:#fff}
.zoom-in{display:flex;flex-direction:column;align-items:center;gap:16px;padding:72px 12px 40px;width:max-content;min-width:100%}
.zoom-in .pg{flex:none;aspect-ratio:595/842;box-shadow:0 10px 30px rgba(0,0,0,.4)}
.book-holder,.zoom-in,.book3d,.cat-img{-webkit-user-select:none;user-select:none;-webkit-touch-callout:none}

/* ---------- terms ---------- */
.tbar{position:sticky;top:var(--top);z-index:20;background:rgba(255,255,255,.96);backdrop-filter:blur(8px);border-bottom:1px solid var(--line);padding:16px 0 12px}
.tbar-in{display:flex;flex-direction:column;gap:12px}
.search{position:relative}
.search svg{position:absolute;left:16px;top:50%;transform:translateY(-50%);color:var(--ink-3)}
.search input{width:100%;height:50px;border-radius:14px;border:1.5px solid var(--line);background:var(--surface);padding:0 16px 0 46px;font:inherit;font-size:16px;outline:none}
.search input:focus{border-color:var(--blue);background:#fff}
.chips{display:flex;gap:6px;overflow-x:auto;scrollbar-width:none;padding-bottom:2px}
.chips::-webkit-scrollbar{display:none}
.chip{flex:none;height:34px;padding:0 13px;border-radius:999px;border:1.5px solid var(--line);font-size:14px;font-weight:600;color:var(--ink-2);background:#fff;white-space:nowrap}
.chip.on{border-color:var(--c,var(--ink));background:var(--c,var(--ink));color:#fff}
.tbar-row{display:flex;align-items:center;gap:16px;flex-wrap:wrap}
.seg{display:inline-flex;background:var(--surface);border-radius:12px;padding:3px}
.seg button{height:32px;padding:0 12px;border-radius:9px;font-size:14px;font-weight:600;color:var(--ink-2)}
.seg button.on{background:#fff;color:var(--ink);box-shadow:0 1px 3px rgba(0,0,0,.12)}
.tog{display:inline-flex;align-items:center;gap:6px;font-size:14px;font-weight:600;color:var(--ink-2);cursor:pointer}
.tog input{width:18px;height:18px;accent-color:var(--blue)}
.known-meter{margin-left:auto;display:inline-flex;align-items:center;gap:8px;font-size:14px;color:var(--ink-2);font-weight:600}
.km-bar{width:120px;height:8px;border-radius:99px;background:var(--surface);overflow:hidden}
.km-bar i{display:block;height:100%;width:0;background:var(--ok);border-radius:99px;transition:width .3s}
.t-count{color:var(--ink-3);font-size:14px;margin:18px 0 12px}
.tgrid{display:grid;grid-template-columns:repeat(auto-fill,minmax(330px,1fr));gap:14px;padding-bottom:48px}
.tc{position:relative;display:flex;flex-direction:column;border:1px solid var(--line);border-radius:var(--r);background:#fff;padding:18px 20px 14px;border-top:4px solid var(--c);
  -webkit-user-select:none;user-select:none}
.tc.known{background:#FBFBFA}
.tc.known .tc-t{color:var(--ink-3)}
.tc-h{display:flex;align-items:center;gap:8px;font-size:12px;font-weight:700;color:var(--ink-3)}
.tc-cat{color:var(--c)}
.st{color:#F5A524;letter-spacing:1px;font-size:13px}
.st.s3{color:var(--coral)}
.tag-new{background:var(--blue);color:#fff;border-radius:6px;padding:1px 6px;font-size:11px;letter-spacing:.02em}
.tc-t{font-size:23px;font-weight:800;letter-spacing:-.025em;margin:6px 0 0;line-height:1.3}
.tc-en{font-size:13px;word-spacing:.08em;color:var(--ink-3);margin:2px 0 10px}
.tc-d{font-size:15.5px;margin:0 0 12px;line-height:1.6}
.tc-p{font-size:14px;background:var(--surface);border-radius:10px;padding:10px 12px;margin:0 0 12px;color:var(--ink-2);line-height:1.55}
.tc-p b{color:var(--blue-deep);cursor:pointer;border-bottom:1px dashed currentColor}
.tc-f{display:flex;align-items:center;justify-content:space-between;margin-top:auto;padding-top:8px;border-top:1px solid #F0F0F0}
.tc-f a{font-size:13px;font-weight:700;color:var(--ink-3)}
.tc-f a:hover{color:var(--blue)}
.kbtn{display:inline-flex;align-items:center;gap:6px;font-size:13px;font-weight:700;color:var(--ink-3);padding:6px 10px;border-radius:999px;border:1.5px solid var(--line)}
.kbtn svg{width:15px;height:15px}
.kbtn.on{background:var(--ok);border-color:var(--ok);color:#fff}
.empty{grid-column:1/-1;text-align:center;color:var(--ink-3);padding:60px 0}

/* ---------- quiz ---------- */
.qwrap{max-width:760px;padding-top:40px;padding-bottom:60px}
.qcard{background:#fff;border:1px solid var(--line);border-radius:20px;padding:32px;box-shadow:var(--shadow)}
.q-title{font-size:30px;font-weight:800;letter-spacing:-.03em;margin:0 0 6px}
.q-sub{color:var(--ink-2);margin:0 0 26px}
.q-lbl{font-size:14px;font-weight:700;color:var(--ink-3);margin:0 0 8px}
.q-scopes{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:8px;margin-bottom:22px}
.scope{display:flex;justify-content:space-between;align-items:center;text-align:left;padding:12px 14px;border-radius:12px;border:1.5px solid var(--line);font-weight:600;font-size:15px;background:#fff}
.scope small{color:var(--ink-3);font-weight:600}
.scope.on{border-color:var(--ink);background:var(--ink);color:#fff}
.scope.on small{color:#ccc}
.scope:disabled{opacity:.4;cursor:default}
.q-n{display:flex;gap:8px;margin-bottom:28px}
.q-n button{height:40px;padding:0 18px;border-radius:999px;border:1.5px solid var(--line);font-weight:700}
.q-n button.on{border-color:var(--ink);background:var(--ink);color:#fff}
.q-top{display:flex;justify-content:space-between;align-items:center;margin-bottom:10px;font-size:14px;font-weight:700;color:var(--ink-3)}
.q-quit{color:var(--ink-3);font-size:14px;font-weight:600}
.q-prog{height:6px;border-radius:99px;background:var(--surface);overflow:hidden;margin-bottom:26px}
.q-prog i{display:block;height:100%;background:var(--coral);transition:width .3s}
.q-ask{font-size:15px;font-weight:700;color:var(--blue);margin:0 0 10px}
.q-def{font-size:22px;line-height:1.6;font-weight:600;letter-spacing:-.02em;margin:0 0 26px;-webkit-user-select:none;user-select:none}
.q-opts{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.opt{min-height:64px;padding:12px 16px;border-radius:14px;border:1.5px solid var(--line);background:#fff;font-size:18px;font-weight:700;text-align:left;display:flex;align-items:center;gap:12px;transition:border-color .12s,background .12s}
.opt:hover:not(:disabled){border-color:var(--ink)}
.opt i{flex:none;display:grid;place-items:center;width:28px;height:28px;border-radius:8px;background:var(--surface);font-style:normal;font-size:14px;color:var(--ink-3)}
.opt.ok{border-color:var(--ok);background:var(--ok-bg)}
.opt.ok i{background:var(--ok);color:#fff}
.opt.no{border-color:var(--bad);background:var(--bad-bg)}
.opt.no i{background:var(--bad);color:#fff}
.opt:disabled{cursor:default}
.q-exp{margin-top:20px;border-radius:14px;padding:16px 18px;background:var(--surface);font-size:15px;line-height:1.6}
.q-exp h4{margin:0 0 4px;font-size:17px}
.q-exp h4.ok{color:var(--ok)}.q-exp h4.no{color:var(--bad)}
.q-exp p{margin:4px 0 0;color:var(--ink-2)}
.q-exp a{color:var(--blue);font-weight:700}
.q-next{margin-top:18px;width:100%}
.btn-dark{background:var(--ink);color:#fff}
.btn-dark:hover{background:#000}
.r-score{font-size:72px;font-weight:800;letter-spacing:-.04em;line-height:1;margin:8px 0 6px}
.r-score small{font-size:28px;color:var(--ink-3)}
.r-list{list-style:none;padding:0;margin:20px 0 26px;border-top:1px solid var(--line)}
.r-list li{padding:12px 0;border-bottom:1px solid var(--line);font-size:15px}
.r-list b{display:block;font-size:17px}
.r-list span{color:var(--ink-2)}
.r-btns{display:flex;gap:10px;flex-wrap:wrap}

/* ---------- toast & tabbar ---------- */
.toast{position:fixed;left:50%;bottom:28px;transform:translate(-50%,20px);background:var(--ink);color:#fff;padding:12px 18px;border-radius:999px;font-size:14px;font-weight:600;opacity:0;pointer-events:none;transition:.25s;z-index:100;white-space:nowrap}
.toast.on{opacity:1;transform:translate(-50%,0)}
.tabbar{display:none}

@media print{body>*{display:none!important}body::after{content:"이 자료는 인쇄할 수 없습니다. © 김덕진 · ITCL";display:block;padding:40px;font-size:18px}}

/* ---------- responsive ---------- */
@media (max-width:980px){
  .cats{grid-template-columns:repeat(3,1fr)}
  .hero{grid-template-columns:1fr;gap:36px;padding-top:48px}
  .hero-book{order:-1}
  .book3d{width:min(240px,60%)}
  .compare{grid-template-columns:1fr}
}
@media (max-width:720px){
  :root{--top:56px}
  .wrap,.top-in{padding:0 16px}
  .nav{display:none}
  .brand-txt{font-size:15px}
  .tabbar{display:flex;position:fixed;left:0;right:0;bottom:0;z-index:60;background:rgba(255,255,255,.97);backdrop-filter:blur(10px);border-top:1px solid var(--line);padding:6px 4px calc(6px + env(safe-area-inset-bottom))}
  .tabbar a{flex:1;display:flex;flex-direction:column;align-items:center;gap:2px;font-size:11px;font-weight:600;color:var(--ink-3);padding:4px 0}
  .tabbar a.on{color:var(--coral)}
  .tabbar svg{width:22px;height:22px}
  body{padding-bottom:64px}
  .toast{bottom:84px}
  .hero{padding-top:32px;padding-bottom:32px}
  .lead{font-size:16px}
  .lead br{display:none}
  .stats{gap:22px}
  .stats dd{font-size:24px}
  .entries{grid-template-columns:1fr;gap:10px}
  .entry{padding:18px 18px 16px}
  .entry h3{font-size:19px}
  .sec{padding-top:44px}
  .sec-head h2{font-size:25px}
  .sec-head p{font-size:15px}
  .cats{grid-template-columns:1fr 1fr;gap:10px}
  .cat-b{padding:10px 12px 12px}
  .cat-t{font-size:15px}
  .cat-w{font-size:12.5px}
  .cat-a a{font-size:12px;padding:7px 0}
  .cmp{padding:20px}
  .cmp p{font-size:15px}
  .foot-legal{text-align:left}
  .book-stage{padding:12px 8px 4px;min-height:auto}
  .book-bar{bottom:64px;gap:6px;padding:10px 8px 12px}
  .bk-sep{display:none}
  .bk-toc select{max-width:132px;padding:0 30px 0 12px;font-size:13px}
  .bk-pos{min-width:58px;font-size:14px}
  .ib{width:42px}
  .tb span{display:none}
  .tb{width:44px;padding:0}
  .tbar{padding:10px 0 8px}
  .tbar-in{gap:8px}
  .search input{height:44px}
  .known-meter{margin-left:0}
  .km-bar{width:80px}
  .tgrid{grid-template-columns:1fr}
  .tc-t{font-size:21px}
  .qwrap{padding-top:20px}
  .qcard{padding:22px 18px;border-radius:16px}
  .q-title{font-size:24px}
  .q-def{font-size:18px}
  .q-opts{grid-template-columns:1fr}
  .opt{min-height:54px;font-size:16px}
  .r-score{font-size:56px}
}