:root{
  --ink:#12100E;
  --panel:#1B1815;
  --paper:#E7E1D3;
  --paper-lit:#F3E3C8;
  --amber:#E8B23C;
  --vermilion:#C6362A;
  --vermilion-dim:#8E2A21;
  --slate:#8A8272;
  --bone:#D8D2C4;
  --cellfont:"Nanum Myeongjo","Apple SD Gothic Neo","Malgun Gothic",serif;
  --ui:"Gothic A1","Apple SD Gothic Neo","Malgun Gothic","Noto Sans KR",sans-serif;
  --display:"Black Han Sans","Gothic A1","Apple SD Gothic Neo",sans-serif;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{
  background:var(--ink);
  color:var(--bone);
  font-family:var(--ui);
  font-weight:300;
  -webkit-text-size-adjust:100%;
  padding:0 0 64px;
}
.wrap{max-width:1120px;margin:0 auto;padding:28px 20px 0}

/* ---------- 머리말 ---------- */
.head{border-bottom:2px solid var(--vermilion);padding-bottom:14px;margin-bottom:26px;position:relative}
.eyebrow{
  font-size:11px;letter-spacing:.32em;color:var(--slate);
  font-weight:700;text-transform:uppercase;margin-bottom:10px;
}
.head h1{
  font-family:var(--display);
  font-weight:400;
  font-size:clamp(30px,7vw,54px);
  line-height:.98;
  margin:0;
  color:var(--paper);
  letter-spacing:-.01em;
}
.head h1 em{font-style:normal;color:var(--vermilion);display:block}
.meta{
  display:flex;gap:18px;align-items:baseline;
  position:absolute;right:0;bottom:14px;
}
.meta b{font-family:var(--ui);font-weight:700;font-size:22px;color:var(--amber);font-variant-numeric:tabular-nums}
.meta span{font-size:11px;letter-spacing:.18em;color:var(--slate);display:block;font-weight:700}
@media (max-width:640px){
  .meta{position:static;margin-top:14px}
}

/* ---------- 본문 배치 ---------- */
.stage{display:grid;grid-template-columns:minmax(0,auto) minmax(280px,1fr);gap:40px;align-items:start}
@media (max-width:900px){.stage{grid-template-columns:1fr;gap:26px}}

/* ---------- 현재 단서 띠 ---------- */
.cluebar{
  display:flex;align-items:center;gap:12px;
  background:var(--panel);border-left:5px solid var(--vermilion);
  padding:11px 14px;margin-bottom:14px;min-height:56px;
}
.cb-num{
  background:var(--vermilion);color:#fff;font-weight:900;font-size:14px;
  min-width:26px;height:26px;display:grid;place-items:center;flex:none;
}
.cb-dir{font-size:11px;font-weight:700;letter-spacing:.2em;color:var(--amber);flex:none}
.cb-text{font-size:15px;line-height:1.45;color:var(--paper);font-weight:300}

/* ---------- 격자 ---------- */
.board-frame{position:relative;width:min(94vw,468px)}
.board{
  display:grid;grid-template-columns:repeat(9,1fr);gap:2px;
  background:#000;border:3px solid #000;
  box-shadow:9px 9px 0 var(--vermilion-dim);
  width:100%;
}
.cell{
  position:relative;aspect-ratio:1/1;background:var(--paper);
  display:grid;place-items:center;cursor:pointer;user-select:none;
  transition:background .09s linear;
}
.cell.block{background:#0B0A08;cursor:default}
.cell .n{
  position:absolute;top:2px;left:4px;font-family:var(--ui);
  font-size:clamp(8px,1.9vw,10px);font-weight:700;color:var(--vermilion);line-height:1;pointer-events:none;
}
.cell .ch{
  font-family:var(--cellfont);font-weight:700;color:#14120F;
  font-size:clamp(17px,4.4vw,27px);line-height:1;pointer-events:none;
  transform:translateY(1px);
}
.cell.lit{background:var(--paper-lit)}
.cell.cur{background:var(--amber)}
.cell.given .ch{color:var(--vermilion)}
.cell.bad::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:
    linear-gradient(to bottom left, transparent 46%, var(--vermilion) 46%, var(--vermilion) 54%, transparent 54%);
  opacity:.85;
}
.board.solved .cell:not(.block){background:#EFE4C6}
#ime{
  position:absolute;pointer-events:none;opacity:0;
  border:0;padding:0;margin:0;background:transparent;
  color:transparent;caret-color:transparent;font-size:16px;
  z-index:2;
}

/* ---------- 도구 ---------- */
.tools{display:flex;flex-wrap:wrap;gap:7px;margin-top:22px}
.tools button{
  font-family:var(--ui);font-size:12px;font-weight:700;letter-spacing:.06em;
  color:var(--bone);background:transparent;border:1px solid #3A352D;
  padding:9px 13px;cursor:pointer;transition:.14s;
}
.tools button:hover{border-color:var(--amber);color:var(--amber)}
.tools button.on{background:var(--vermilion);border-color:var(--vermilion);color:#fff}
.tools button:focus-visible{outline:2px solid var(--amber);outline-offset:2px}
.tip{font-size:12px;line-height:1.7;color:var(--slate);margin:16px 0 0;max-width:44ch}
.tip kbd{
  font-family:var(--ui);font-size:11px;font-weight:700;color:var(--bone);
  border:1px solid #3A352D;padding:1px 5px;
}

/* ---------- 단서 목록 ---------- */
.cluegroup+.cluegroup{margin-top:30px}
.cluegroup h2{
  font-family:var(--ui);font-size:11px;font-weight:900;letter-spacing:.3em;
  color:var(--ink);background:var(--amber);display:inline-block;
  padding:4px 11px;margin:0 0 12px;
}
.cluegroup ol{list-style:none;margin:0;padding:0}
.cluegroup li{
  display:grid;grid-template-columns:30px 1fr;gap:10px;align-items:baseline;
  padding:8px 10px 8px 6px;cursor:pointer;border-left:3px solid transparent;
  border-bottom:1px solid #26221D;
}
.cluegroup li b{font-weight:900;font-size:13px;color:var(--slate);text-align:right}
.cluegroup li p{margin:0;font-size:13.5px;line-height:1.5;color:#BFB8A8;font-weight:300}
.cluegroup li i{font-style:normal;color:var(--slate);font-size:11px;margin-left:5px}
.cluegroup li:hover{background:#1B1815}
.cluegroup li.cross{border-left-color:var(--vermilion-dim)}
.cluegroup li.cross b{color:var(--bone)}
.cluegroup li.on{background:var(--vermilion);border-left-color:var(--amber)}
.cluegroup li.on b,.cluegroup li.on p,.cluegroup li.on i{color:#fff}
.cluegroup li.filled b{color:var(--amber)}

/* ---------- 완료 ---------- */
.done{
  position:fixed;inset:auto 0 0;background:var(--vermilion);color:#fff;
  padding:16px 20px;display:flex;gap:14px;align-items:center;justify-content:center;
  font-weight:700;font-size:15px;letter-spacing:.02em;z-index:9;
  animation:rise .35s ease-out;
}
@keyframes rise{from{transform:translateY(100%)}to{transform:translateY(0)}}
.done[hidden]{display:none}
@media (prefers-reduced-motion:reduce){
  *{animation:none !important;transition:none !important}
}

/* ---------- 셸(index.html) 프레임 안에서 ---------- */
.framed body{padding-bottom:72px}
.framed .wrap{padding-top:18px}
.framed .head h1{font-size:clamp(26px,5.4vw,40px)}
.framed .head{padding-bottom:12px;margin-bottom:20px}