:root{
  --bg:#FFFFFF;--soft:#F6F7FB;--surface:#FFFFFF;--ink:#2D3150;--muted:#7A7F9A;--line:#E6E8F0;
  --accent:#8C96F2;--accent-deep:#5A66D6;--accent-ink:#3C47B5;--accent-soft:#E9EBFF;--accent-mid:#D5DAFF;
  --good:#7FD3BF;--good-deep:#1E8C75;--good-soft:#E3F7F1;--good-mid:#C4EEE2;
  --bad:#F6A5B8;--bad-deep:#C94468;--bad-soft:#FDECF0;--bad-mid:#FAD2DC;
  --display:"Malgun Gothic","맑은 고딕","Apple SD Gothic Neo","Noto Sans KR",system-ui,sans-serif;
  --sans:"Malgun Gothic","맑은 고딕","Apple SD Gothic Neo","Noto Sans KR",system-ui,sans-serif;
  --shadow:0 6px 24px -14px rgba(45,49,80,.18);
  color-scheme:light;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;color:var(--ink);font-family:var(--sans);font-size:16px;line-height:1.65;
  background-color:var(--bg);
}
[hidden]{display:none!important}
img{max-width:100%}
a{color:var(--accent-deep)}
#root{max-width:720px;margin:0 auto;padding-inline:16px;padding-block:24px 64px;display:flex;flex-direction:column;gap:20px}
button{font:inherit;color:inherit;cursor:pointer}
button:focus-visible,input:focus-visible,textarea:focus-visible,a:focus-visible{outline:3px solid var(--accent);outline-offset:2px}

/* header */
.top{display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap}
.brand{display:flex;align-items:center;gap:12px;color:inherit;text-decoration:none}
.seal{
  width:50px;height:50px;display:grid;place-items:center;flex:0 0 auto;
  background:var(--accent);color:var(--accent-ink);font-family:var(--display);font-size:24px;
  border-radius:50% 50% 46% 54% / 55% 48% 52% 45%;
  box-shadow:0 4px 0 var(--accent-deep);transform:rotate(-8deg);
  position:relative;
}
.seal::after{content:"";position:absolute;right:-3px;top:-2px;width:14px;height:14px;border-radius:50%;background:var(--sun);border:3px solid var(--bg)}
.brand:hover .seal{animation:wobble .6s ease}
.brand h1{margin:0;font-family:var(--display);font-size:28px;font-weight:700;line-height:1.1;letter-spacing:.01em}
.brand h1 .o{color:var(--good-deep)}
.brand h1 .x{color:var(--bad-deep)}
.brand p{margin:2px 0 0;color:var(--muted);font-size:13.5px}

/* weeks */
.weeks{display:flex;gap:8px;overflow-x:auto;padding:4px 2px 8px;scrollbar-width:thin}
.wk{
  flex:0 0 auto;border:2px solid var(--line);background:var(--surface);border-radius:16px;
  padding:6px 14px;display:flex;flex-direction:column;align-items:center;line-height:1.3;
  transition:transform .15s,border-color .15s;
}
.wk:hover{transform:translateY(-2px)}
.wk b{font-weight:700;font-family:var(--display);font-weight:700;font-size:16px}
.wk small{font-size:12px;color:var(--muted);font-variant-numeric:tabular-nums}
.wk.on{border-color:var(--accent-mid);background:var(--accent-soft);color:var(--accent-ink)}
.wk.on small{color:inherit;opacity:.85}

.weekhead{display:flex;align-items:center;justify-content:space-between;gap:10px;flex-wrap:wrap}
.weekhead h2{margin:0;font-family:var(--display);font-weight:700;font-size:23px;text-wrap:balance}
.score{font-size:13.5px;color:var(--muted);font-variant-numeric:tabular-nums;background:var(--surface);border:2px solid var(--line);border-radius:999px;padding:3px 12px}
.score b{color:var(--good-deep)}

/* progress dots */
.dots{display:flex;gap:6px;flex-wrap:wrap}
.dot{font-weight:700;
  width:32px;height:32px;border-radius:12px;border:2px solid var(--line);background:var(--surface);
  font-family:var(--display);font-size:14px;color:var(--muted);padding:0;font-variant-numeric:tabular-nums;
  transition:transform .15s;
}
.dot:hover{transform:translateY(-2px)}
.dot.right{background:var(--good-soft);border-color:var(--good);color:var(--good-deep)}
.dot.wrong{background:var(--bad-soft);border-color:var(--bad);color:var(--bad-deep)}
.dot.cur{border-color:var(--accent-deep);color:var(--accent-ink);box-shadow:0 0 0 2px var(--accent-soft)}
.gap{align-self:center;color:var(--muted);font-size:14px;padding:0 2px;letter-spacing:.1em}

/* question card */
.card{
  background:var(--surface);border:2px solid var(--line);border-radius:24px;padding:26px;
  display:flex;flex-direction:column;gap:22px;box-shadow:var(--shadow);
}
.qmeta{font-weight:700;
  align-self:flex-start;font-family:var(--display);font-size:14px;color:var(--accent-deep);
  background:var(--accent-soft);border-radius:999px;padding:3px 14px;
}
.qtext{margin:0;font-size:21px;font-weight:700;line-height:1.7;word-break:keep-all;overflow-wrap:anywhere}

.ox{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.oxbtn{
  border:0;border-radius:24px;padding:16px 0 12px;display:flex;flex-direction:column;align-items:center;gap:2px;
  transition:transform .12s,box-shadow .12s,opacity .2s,filter .2s;
}
#btnO{background:var(--good-soft);color:var(--good-deep);border:2px solid var(--good-mid)}
#btnX{background:var(--bad-soft);color:var(--bad-deep);border:2px solid var(--bad-mid)}
.oxbtn .g{font-family:var(--display);font-size:56px;font-weight:400;line-height:1}
.oxbtn .l{font-weight:700;font-family:var(--display);font-size:15px}
.oxbtn:hover:not(:disabled){transform:translateY(-3px)}
#btnO:hover:not(:disabled){border-color:var(--good)}
#btnX:hover:not(:disabled){border-color:var(--bad)}
.oxbtn:active:not(:disabled){transform:scale(.97)!important}
.oxbtn:disabled{cursor:default}
.oxbtn.dim{opacity:.35;filter:grayscale(.6)}
#btnO.answer,#btnX.answer{background:var(--good-mid);color:var(--good-deep);border-color:var(--good);animation:pop .45s cubic-bezier(.3,1.6,.5,1)}
#btnO.miss,#btnX.miss{background:var(--bad-mid);color:var(--bad-deep);border-color:var(--bad);animation:shake .4s}

/* result */
.result{border-top:2px dashed var(--line);padding-top:18px;display:flex;flex-direction:column;gap:14px;animation:rise .3s ease-out}
.verdict{display:flex;align-items:center;gap:10px;flex-wrap:wrap;font-family:var(--display);font-size:21px}
.verdict .chip{font-size:14px;padding:3px 12px;border-radius:999px;color:var(--surface)}
.verdict.good{color:var(--good-deep)}
.verdict.good .chip{background:var(--good);animation:pop .45s cubic-bezier(.3,1.6,.5,1)}
.verdict.bad{color:var(--bad-deep)}
.verdict.bad .chip{background:var(--bad)}
.expl{background:var(--soft);border-radius:18px;padding:14px 16px}
.expl h3{margin:0 0 6px;display:flex;align-items:center;gap:8px;font-family:var(--display);font-weight:700;font-size:15px;color:var(--accent-deep)}
.expl p{margin:0;white-space:pre-wrap;word-break:keep-all;overflow-wrap:anywhere}
.basis{margin-top:10px!important;display:inline-block;font-size:13.5px;font-weight:700;color:var(--accent-deep);background:var(--surface);border:2px solid var(--accent-soft);padding:2px 12px;border-radius:999px}

/* buttons */
.nav{display:flex;gap:8px;justify-content:space-between;flex-wrap:wrap}
.btn{font-weight:700;
  display:inline-flex;align-items:center;justify-content:center;
  border:2px solid var(--line);background:var(--surface);border-radius:999px;padding:8px 18px;
  font-family:var(--display);font-size:15px;text-decoration:none;color:var(--ink);
  transition:transform .12s;
}
.btn:hover:not(:disabled){transform:translateY(-2px)}
.btn:disabled{opacity:.4;cursor:default}
.btn.primary{background:var(--accent-soft);border-color:var(--accent-mid);color:var(--accent-ink)}
.btn.primary:hover:not(:disabled){background:var(--accent-mid)}
.btn.primary:active:not(:disabled){transform:scale(.97)}
.btn.ghost{border-color:transparent;background:none;color:var(--muted)}
.btn.danger{color:var(--bad-deep)}
.btn.danger.armed{background:var(--bad-mid);border-color:var(--bad);color:var(--bad-deep)}
.empty{font-weight:700;background:var(--surface);border:2px dashed var(--line);border-radius:28px;padding:36px 20px;text-align:center;color:var(--muted);margin:0;font-family:var(--display);font-size:17px}
.hint{font-size:13px;color:var(--muted);margin:0;text-align:center}
.hint kbd{font-weight:700;font-family:var(--display);border:2px solid var(--line);border-bottom-width:3px;border-radius:6px;padding:0 6px;font-size:12px;background:var(--surface)}

/* admin */
.panel{background:var(--surface);border:2px solid var(--line);border-radius:24px;padding:22px;display:flex;flex-direction:column;gap:14px;box-shadow:var(--shadow)}
.panel h2{margin:0;font-family:var(--display);font-weight:700;font-size:20px}
.note{margin:0;font-size:14px;color:var(--muted);background:var(--soft);border-radius:14px;padding:10px 14px}
.field{font-weight:700;display:flex;flex-direction:column;gap:4px;font-family:var(--display);font-size:14px;color:var(--muted)}
.field input,.field textarea{
  font-family:var(--sans);font-size:16px;color:var(--ink);background:var(--soft);
  border:2px solid var(--line);border-radius:14px;padding:9px 12px;width:100%;resize:vertical;
  transition:border-color .15s;
}
.field input:focus,.field textarea:focus{border-color:var(--accent);outline:none}
.row2{display:grid;grid-template-columns:120px 1fr;gap:12px}
.ans{display:flex;gap:10px;border:0;padding:0;margin:0}
.ans legend{font-weight:700;font-family:var(--display);font-size:14px;color:var(--muted);padding:0;margin-bottom:4px}
.ans label{font-weight:700;flex:1;display:flex;align-items:center;justify-content:center;gap:6px;border:2px solid var(--line);border-radius:16px;padding:8px;font-family:var(--display);font-size:16px;cursor:pointer;position:relative}
.ans label:has(#fAnsO:checked){border-color:var(--good);background:var(--good-soft);color:var(--good-deep)}
.ans label:has(#fAnsX:checked){border-color:var(--bad);background:var(--bad-soft);color:var(--bad-deep)}
.ans input{position:absolute;opacity:0;pointer-events:none}
.ans .g{font-size:22px;line-height:1}
.formbtns{display:flex;gap:8px;flex-wrap:wrap}
.listhead{display:flex;justify-content:space-between;align-items:baseline}
.listhead span{font-size:13.5px;color:var(--muted);font-variant-numeric:tabular-nums}
.group{display:flex;flex-direction:column;gap:8px}
.group h3{margin:6px 0 0;font-family:var(--display);font-weight:700;font-size:16px;color:var(--accent-deep)}
.item{display:grid;grid-template-columns:34px 1fr auto;gap:10px;align-items:start;border:2px solid var(--line);border-radius:18px;padding:10px 12px}
.item.editing{border-color:var(--accent);background:var(--accent-soft)}
.item .a{font-weight:700;width:32px;height:32px;border-radius:50%;display:grid;place-items:center;font-family:var(--display);font-size:18px}
.item .a.O{background:var(--good-soft);color:var(--good-deep)}
.item .a.X{background:var(--bad-soft);color:var(--bad-deep)}
.item .t{font-size:15px;word-break:keep-all;overflow-wrap:anywhere}
.item .t small{display:block;color:var(--muted);font-size:13px;margin-top:2px}
.item .acts{display:flex;gap:4px}
.item .acts .btn{padding:4px 12px;font-size:13.5px}
.savebar{
  position:sticky;bottom:calc(12px + env(safe-area-inset-bottom,0px));display:flex;align-items:center;gap:8px;flex-wrap:wrap;
  background:var(--accent-soft);color:var(--ink);border:2px solid var(--accent-mid);border-radius:20px;padding:10px 12px 10px 18px;box-shadow:var(--shadow)
}
.savebar span{flex:1;min-width:160px;font-size:14.5px}
.savebar .btn.ghost{color:var(--muted)}
.savebar .btn.primary{background:var(--surface)}
.msg{font-size:14px;border-radius:14px;padding:10px 14px;margin:0;background:var(--accent-soft);color:var(--ink)}
.msg.err{background:var(--bad-soft)}
.status{font-size:14px;color:var(--muted)}
.status.ok{color:var(--good-deep)}
.status.err{color:var(--bad-deep)}
details.help{font-size:14px;color:var(--muted)}
details.help summary{font-weight:700;cursor:pointer;font-family:var(--display);color:var(--ink)}
details.help ol{margin:8px 0 0;padding-left:20px;display:flex;flex-direction:column;gap:4px}
.foot{font-size:13px;color:var(--muted);text-align:center;margin:0}

@keyframes pop{0%{transform:scale(.85)}60%{transform:scale(1.08)}100%{transform:scale(1)}}
@keyframes shake{0%,100%{transform:translateX(0)}25%{transform:translateX(-6px)}50%{transform:translateX(5px)}75%{transform:translateX(-3px)}}
@keyframes rise{from{opacity:.4;transform:translateY(6px)}to{opacity:1;transform:none}}
@keyframes wobble{0%,100%{transform:rotate(-8deg)}30%{transform:rotate(6deg)}60%{transform:rotate(-12deg)}}

@media (max-width:520px){
  .card{padding:20px;border-radius:24px}
  .qtext{font-size:18.5px}
  .oxbtn .g{font-size:52px}
  .nav .btn{padding:8px 12px;font-size:14px}
  .row2{grid-template-columns:1fr}
  .item{grid-template-columns:32px 1fr}
  .item .acts{grid-column:2}
}
@media (prefers-reduced-motion:reduce){*{transition:none!important;animation:none!important}}
.ans-chip{font-size:13px;font-weight:700;padding:1px 10px;border-radius:999px}
.ans-chip.O{background:var(--good-mid);color:var(--good-deep)}
.ans-chip.X{background:var(--bad-mid);color:var(--bad-deep)}
.brand h1{font-size:26px}

/* per-week pastel colors */
.c0{--c-bg:#E3F7F1;--c-bd:#C4EEE2;--c-ink:#1E8C75}
.c1{--c-bg:#FDECF0;--c-bd:#FAD2DC;--c-ink:#C94468}
.c2{--c-bg:#E9EBFF;--c-bd:#D5DAFF;--c-ink:#3C47B5}
.c3{--c-bg:#FFEFE3;--c-bd:#FFD9BF;--c-ink:#B25A1E}
.c4{--c-bg:#E3F2FD;--c-bd:#C3E2F8;--c-ink:#2A6FA8}
.c5{--c-bg:#FFF8DC;--c-bd:#F7E6A0;--c-ink:#86680C}
.wk[class*=" c"]{background:var(--surface);border-color:var(--c-bd);color:var(--c-ink)}
.wk[class*=" c"].on{background:var(--c-bg);border-color:var(--c-ink)}

/* home */
.tagline{margin:4px 0 0!important;font-size:12.5px!important;color:var(--muted)}
#quizView:not([hidden]){display:flex;flex-direction:column;gap:16px}
.home{display:flex;flex-direction:column;gap:14px}
.home-title{margin:0;font-size:17px;font-weight:700;color:var(--muted)}
.wgrid{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:12px}
.wcard{
  display:flex;flex-direction:column;align-items:flex-start;gap:6px;text-align:left;
  background:var(--c-bg);border:2px solid var(--c-bd);color:var(--c-ink);
  border-radius:22px;padding:18px;text-decoration:none;transition:transform .15s,border-color .15s;
}
.wcard:hover{transform:translateY(-3px);border-color:var(--c-ink)}
.wcard b{font-size:22px;font-weight:700}
.wcard span{font-size:13.5px;color:var(--ink);opacity:.75;font-variant-numeric:tabular-nums}
.wcard .bar{align-self:stretch;height:6px;border-radius:99px;background:var(--surface);overflow:hidden;margin-top:4px}
.wcard .bar i{display:block;height:100%;background:var(--c-ink);opacity:.55;border-radius:99px}
.wgrid .empty{grid-column:1/-1}
.quiztop{display:flex;align-items:center;gap:8px}
.quiztop .weeks{flex:1;min-width:0}
.btn.back{flex:0 0 auto;padding:6px 14px;font-size:14px}
.wk{text-decoration:none;color:var(--ink)}
.brand:hover h1{opacity:.85}

/* study link */
.studylink{
  display:flex;align-items:center;gap:14px;text-decoration:none;color:var(--ink);
  background:var(--soft);border:2px solid var(--line);border-radius:22px;padding:16px 18px;
  transition:transform .15s,border-color .15s;
}
.studylink:hover{transform:translateY(-2px);border-color:var(--accent-mid)}
.sl-icon{font-size:26px;line-height:1}
.sl-text{flex:1;display:flex;flex-direction:column;line-height:1.35}
.sl-text b{font-size:17px}
.sl-text small{font-size:13px;color:var(--muted)}
.sl-arrow{font-size:18px;color:var(--accent-deep)}
.home-title{margin-top:10px!important;color:var(--ink)!important}

/* fuller home screen */
.at-home .top{
  background:linear-gradient(135deg,#E9EBFF 0%,#FDECF0 55%,#E3F7F1 100%);
  border-radius:28px;padding:30px 24px 26px;
}
.at-home .brand h1{font-size:32px}
.at-home .tagline{font-size:13.5px!important;margin-top:8px!important;color:var(--ink);opacity:.7}
.wgrid{grid-template-columns:1fr}
.wcard{
  display:grid;grid-template-columns:1fr auto;align-items:center;gap:6px 12px;
  padding:20px 22px;border-radius:22px;
}
.wc-main{display:flex;flex-direction:column;gap:2px;min-width:0}
.wcard b{font-size:24px}
.wc-go{font-size:14.5px;font-weight:700;color:var(--c-ink);background:var(--surface);border-radius:999px;padding:6px 14px;white-space:nowrap}
.wcard .bar{grid-column:1/-1;height:7px;margin-top:8px}
@media (min-width:640px){.wgrid{grid-template-columns:1fr 1fr}}