:root{
  --bg:#f5f4f0; --surface:#fbfbf9; --panel:#ffffff; --panel-soft:#f7f6f2;
  --ink:#1c1c1a; --ink-hover:#3a3935; --ink-2:#55534d; --sub:#7a776f; --muted:#8a877f;
  --line:#e3e1db; --line-2:#dcdad3; --line-3:#efeee9; --hover:#efeee9; --soft:#f3f2ee; --track:#ebe9e3;
  --accent:#5b4bdb; /* 바이올렛 */
  --accent-soft:#ebe8fb;
  --font:"IBM Plex Sans KR",sans-serif; --mono:"JetBrains Mono",monospace;
}
*{box-sizing:border-box}
[hidden]{display:none !important}
body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--font);-webkit-font-smoothing:antialiased;word-break:keep-all}
button{font:inherit;color:inherit}
.mono-label{font-family:var(--mono);font-size:11px;letter-spacing:.12em;color:var(--muted)}
.app{min-height:calc(100vh - 48px);display:flex;flex-direction:column}
.topbar{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:16px 28px;border-bottom:1px solid var(--line);background:var(--surface);flex-wrap:wrap}
.brand{display:flex;align-items:baseline;gap:14px;min-width:0;flex-wrap:wrap}
.home{font-size:13px;color:var(--ink-2);text-decoration:none}
.home:hover{color:var(--ink)}
.brand-title{font-size:17px;font-weight:700;letter-spacing:-.01em}
.actions{display:flex;gap:8px;flex-wrap:wrap}
.btn{height:36px;padding:0 14px;background:transparent;border:1px solid var(--line-2);border-radius:999px;font-size:13px;cursor:pointer;white-space:nowrap}
.btn:hover{background:var(--hover)}
.btn:disabled{opacity:.4;cursor:default}
.btn--solid{background:var(--accent);color:#fff;border:none;font-weight:500}
.btn--solid:hover{background:#4a3bc4}
.btn--solid:disabled:hover{background:var(--accent)}
.text-input{height:40px;padding:0 12px;background:var(--surface);border:1px solid var(--line-2);border-radius:8px;font:inherit;font-size:14px;color:var(--ink)}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
.note{margin:0;font-size:12px;line-height:1.6;color:var(--muted)}
.link{padding:2px 0;background:transparent;border:none;font-size:12px;color:var(--sub);text-decoration:underline;text-underline-offset:3px;cursor:pointer}
.link:hover{color:var(--ink)}
.check{display:flex;align-items:center;gap:8px;font-size:13px;color:var(--ink-2);cursor:pointer}
.check input{width:16px;height:16px;margin:0;accent-color:var(--accent)}

/* ---------- 레이아웃 ---------- */
.layout{flex:1;display:flex;align-items:flex-start}
.board{flex:1;min-width:0;padding:32px 36px 48px;display:flex;flex-direction:column;align-items:center;gap:20px}
.panel{flex:0 0 360px;align-self:stretch;padding:28px;border-left:1px solid var(--line);background:var(--surface);display:flex;flex-direction:column;gap:28px}
.board-hint{margin:0;font-size:13px;color:var(--sub);text-align:center}

/* ---------- 사다리 카드 ---------- */
.ladder-card{width:100%;max-width:820px;padding:22px 18px;border-radius:22px;background:var(--panel);border:1px solid var(--line);
  background-image:linear-gradient(var(--line-3) 1px,transparent 1px),linear-gradient(90deg,var(--line-3) 1px,transparent 1px);background-size:22px 22px;background-position:-1px -1px}
.names,.results{display:grid;grid-template-columns:repeat(var(--n),minmax(0,1fr));gap:4px}
.name-btn{position:relative;display:flex;flex-direction:column;align-items:center;gap:5px;min-width:0;padding:8px 2px 6px;border:none;border-radius:12px;background:transparent;cursor:pointer;transition:background .15s,transform .15s}
.name-btn:hover{background:var(--soft)}
.name-btn:active{transform:scale(.96)}
.name-btn:disabled{cursor:default}
.token{width:30px;height:30px;border-radius:50%;background:var(--c);color:#fff;display:flex;align-items:center;justify-content:center;font-family:var(--mono);font-size:13px;font-weight:500;box-shadow:0 3px 8px color-mix(in srgb,var(--c) 40%,transparent)}
.name-btn.is-done .token{box-shadow:0 0 0 3px #fff,0 0 0 5px var(--c)}
.name-text{max-width:100%;font-size:13px;font-weight:500;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.ladder-box{position:relative;height:380px;margin:4px 0}
#ladder{display:block;width:100%;height:100%;overflow:visible}
#ladder .rail{stroke:var(--ink);stroke-width:3;stroke-linecap:round}
#ladder .rung{stroke:var(--ink);stroke-width:3;stroke-linecap:round}
#ladder .path{fill:none;stroke-width:6;stroke-linecap:round;stroke-linejoin:round;opacity:.92}
#ladder .head{stroke:#fff;stroke-width:3}
.result-cell{position:relative;min-width:0;min-height:52px;padding:8px 2px;border-radius:12px;border:1.5px dashed var(--line-2);background:var(--panel);display:flex;align-items:center;justify-content:center;text-align:center;font-size:13px;font-weight:500;transition:border-color .3s,background .3s}
.result-cell span{display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;overflow-wrap:anywhere;line-height:1.35}
.result-cell.is-hidden span{font-family:var(--mono);font-size:18px;color:var(--muted)}
.result-cell.is-open{border-style:solid;border-color:var(--c);background:color-mix(in srgb,var(--c) 10%,#fff);animation:flip .45s ease-out}
@keyframes flip{0%{transform:rotateX(90deg)}100%{transform:none}}

/* ---------- 결과표 ---------- */
.table-wrap{width:100%;max-width:820px;display:flex;flex-direction:column;gap:12px;animation:rise .4s ease-out}
.table-head{display:flex;justify-content:space-between;align-items:center}
.table-title{margin:0;font-size:16px;font-weight:700}
.table{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(auto-fill,minmax(180px,1fr));gap:8px}
.table li{display:flex;align-items:center;gap:10px;padding:12px 14px;background:var(--panel);border:1px solid var(--line);border-left:4px solid var(--c);border-radius:12px;font-size:14px;min-width:0;animation:rise .3s ease-out}
.table .t-name{font-weight:500;flex-shrink:0;max-width:45%;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.table .t-arrow{color:var(--muted);font-family:var(--mono)}
.table .t-res{min-width:0;overflow-wrap:anywhere}
@keyframes rise{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}

/* ---------- 패널 ---------- */
.group{display:flex;flex-direction:column;gap:12px}
.group-head{display:flex;justify-content:space-between;align-items:center}
.group-label{font-size:13px;font-weight:500;color:var(--ink-2)}
.stepper{display:flex;align-items:center;gap:10px}
.step{width:40px;height:40px;border:1px solid var(--line-2);border-radius:50%;background:var(--panel);font-size:18px;cursor:pointer}
.step:hover{background:var(--hover)}
.step:disabled{opacity:.35;cursor:default}
.step-val{min-width:36px;text-align:center;font-family:var(--mono);font-size:26px;font-weight:500}
.io-head{display:grid;grid-template-columns:28px 1fr 1fr;gap:8px}
.io-head span:first-child{grid-column:2}
.io-list{display:flex;flex-direction:column;gap:6px}
.io-row{display:grid;grid-template-columns:28px 1fr 1fr;gap:8px;align-items:center}
.io-row .dot{width:22px;height:22px;border-radius:50%;background:var(--c);color:#fff;display:flex;align-items:center;justify-content:center;font-family:var(--mono);font-size:11px}
.io-row .text-input{width:100%;min-width:0;height:38px;font-size:13px}
.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}

.toast{position:fixed;left:50%;bottom:28px;z-index:60;transform:translateX(-50%);padding:10px 18px;border-radius:999px;background:var(--ink);color:#fff;font-size:13px;animation:rise .25s ease-out}

@media (max-width:960px){
  .layout{flex-direction:column}
  .board{width:100%;padding:24px 16px 32px}
  .panel{flex:none;width:100%;border-left:none;border-top:1px solid var(--line);padding:24px 16px 40px}
}
@media (max-width:640px){
  .topbar{padding:14px 16px}
  .ladder-card{padding:16px 8px;border-radius:18px}
  .ladder-box{height:320px}
  .token{width:24px;height:24px;font-size:11px}
  .name-text,.result-cell{font-size:11px}
  .names,.results{gap:2px}
  .result-cell{min-height:46px;border-radius:9px}
}
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.01ms !important;animation-iteration-count:1 !important;transition-duration:.01ms !important}
}

/* 다크 모드 (인쇄는 라이트 그대로) — 참가자 색은 그대로 */
@media screen{
  :root[data-theme="dark"]{
    color-scheme:dark;
    --bg:#141318; --surface:#1a1920; --panel:#1f1e26; --panel-soft:#24232c;
    --ink:#ecebf0; --ink-hover:#ffffff; --ink-2:#c9c7d1; --sub:#a09eab; --muted:#8a8895;
    --line:#2e2d36; --line-2:#393843; --line-3:#26252d; --hover:#2a2932; --soft:#26252d; --track:#34333d;
    --accent:#9283ff; --accent-soft:rgba(146,131,255,.16);
  }
  :root[data-theme="dark"] .btn--solid{background:#5b4bdb}
  :root[data-theme="dark"] .btn--solid:hover{background:#6b5cec}
  :root[data-theme="dark"] .btn--solid:disabled:hover{background:#5b4bdb}
  :root[data-theme="dark"] .toast,:root[data-theme="dark"] .tb-presets button[aria-pressed="true"]{color:var(--bg)}
  :root[data-theme="dark"] #ladder .rail,:root[data-theme="dark"] #ladder .rung{stroke:#c9c7d1}
  :root[data-theme="dark"] #ladder .head{stroke:var(--panel)}
  :root[data-theme="dark"] .name-btn.is-done .token{box-shadow:0 0 0 3px var(--panel),0 0 0 5px var(--c)}
  :root[data-theme="dark"] .result-cell.is-open{background:color-mix(in srgb,var(--c) 18%,var(--panel))}
}