: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:#3b5bdb; /* 출석부 블루 */
  --accent-ink:#2f4ac0;
  --accent-soft:#e8edfd;
  --floor:#f0ebe1; --floor-line:rgba(120,96,60,.07);
  --chalk:#2f4a3e; --chalk-ink:#e9f1ea; --wood:#b07d4f;
  --desk:#ffffff; --desk-edge:#d9d2c4;
  --warn:#c92a2a; --warn-soft:#fff0f0;
  --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}
button,input,select,textarea{font:inherit;color:inherit}
.mono-label{font-family:var(--mono);font-size:11px;letter-spacing:.12em;color:var(--muted)}
.app{min-height:100vh;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}
.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:not(:disabled){background:var(--hover)}
.btn:disabled{opacity:.45;cursor:default}
.btn--solid{background:var(--ink);color:#fff;border:none;font-weight:500}
.btn--solid:hover:not(:disabled){background:var(--ink-hover)}
.text-input{height:38px;padding:0 10px;background:var(--surface);border:1px solid var(--line-2);border-radius:8px;font-size:13px;color:var(--ink);width:100%;min-width:0}
.text-input:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-soft)}
.text-area{height:auto;padding:8px 10px;line-height:1.6;resize:vertical}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);border:0}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
@media (max-width:640px){ .topbar{padding:14px 16px} }

.ss{flex:1;width:100%;max-width:1320px;margin:0 auto;padding:24px 28px 40px;display:grid;grid-template-columns:minmax(0,1fr) 330px;gap:24px;align-items:start}

/* 무대 */
.stage{display:flex;flex-direction:column;gap:12px;min-width:0}
.stage-tools{display:flex;align-items:center;gap:12px;flex-wrap:wrap}
.seg{display:flex;background:var(--soft);border-radius:999px;padding:3px;gap:2px;max-width:100%}
.seg-btn{height:32px;padding:0 14px;background:transparent;color:var(--sub);border:none;border-radius:999px;font-size:13px;cursor:pointer;white-space:nowrap}
.seg-btn.is-active{background:var(--panel);color:var(--ink);font-weight:500;box-shadow:0 1px 3px rgba(0,0,0,.12)}
.tool-hint{margin:0;font-size:12.5px;color:var(--sub)}

.sheet{background:var(--panel);border:1px solid var(--line);border-radius:20px;padding:18px;min-width:0}
.print-head{display:flex;align-items:baseline;justify-content:space-between;gap:12px;margin-bottom:12px;flex-wrap:wrap}
.title-wrap{flex:1;min-width:0}
.title-input{width:100%;border:none;border-bottom:1px dashed transparent;background:transparent;font-size:20px;font-weight:700;letter-spacing:-.02em;padding:2px 0;min-width:0}
.title-input:hover{border-bottom-color:var(--line-2)}
.title-input:focus{outline:none;border-bottom-color:var(--accent)}
.print-date{font-family:var(--mono);font-size:12px;color:var(--muted)}
.room-scroll{overflow-x:auto;border-radius:14px;-webkit-overflow-scrolling:touch}
.room{--seat-min:64px;--aisle:14px;min-width:min-content;display:flex;flex-direction:column;gap:18px;padding:18px;border-radius:14px;
  background:repeating-linear-gradient(90deg,var(--floor-line) 0 1px,transparent 1px 64px),var(--floor)}
.room.is-teacher{flex-direction:column-reverse}
.front{position:relative;display:flex;justify-content:center;height:34px;margin:0 6%;border-radius:6px;background:var(--chalk);box-shadow:inset 0 0 0 3px rgba(0,0,0,.12)}
.board-label{align-self:center;color:var(--chalk-ink);font-size:13px;letter-spacing:.3em;padding-left:.3em}
.desk-label{position:absolute;left:50%;top:calc(100% + 6px);transform:translateX(-50%);font-size:11px;color:#fff;background:var(--wood);border-radius:4px;padding:1px 14px}
.room.is-teacher .desk-label{top:auto;bottom:calc(100% + 6px)}
.grid{display:grid;gap:10px 8px;padding-top:12px}
.room.is-teacher .grid{padding-top:0;padding-bottom:12px}

.seat{position:relative;min-width:0;height:62px;padding:16px 6px 6px;border:1px solid var(--desk-edge);border-radius:10px;background:var(--desk);box-shadow:0 3px 0 var(--desk-edge);cursor:pointer;display:flex;align-items:center;justify-content:center;text-align:center;transition:transform .12s,box-shadow .12s,border-color .12s;perspective:400px}
.seat:hover{transform:translateY(-1px)}
.seat-no{position:absolute;left:7px;top:4px;font-family:var(--mono);font-size:10px;color:var(--muted)}
.seat-name{font-size:14px;font-weight:700;letter-spacing:-.02em;line-height:1.2;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;max-width:100%}
.seat.is-vacant .seat-name{color:var(--muted);font-weight:400}
.seat.is-empty{background:transparent;border:1.5px dashed var(--line-2);box-shadow:none}
.seat.is-empty .seat-name{font-size:11.5px;color:var(--muted);font-weight:400}
.seat.is-empty .seat-no{display:none}
.seat.is-fixed{border-color:var(--accent)}
.seat.is-fixed::after{content:"고정";position:absolute;right:5px;top:4px;font-size:9.5px;font-weight:700;color:#fff;background:var(--accent);border-radius:4px;padding:0 4px;line-height:15px}
.seat.is-picked{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-soft),0 3px 0 var(--accent);transform:translateY(-2px)}
.seat.is-hidden{background:var(--accent);border-color:var(--accent-ink);box-shadow:0 3px 0 var(--accent-ink);
  background-image:radial-gradient(rgba(255,255,255,.18) 1.5px,transparent 1.5px);background-size:10px 10px}
.seat.is-hidden .seat-name{color:#fff;font-size:18px;font-family:var(--mono)}
.seat.is-hidden .seat-no{color:rgba(255,255,255,.75)}
.seat.is-flip{animation:flip .45s ease both}
.seat.is-new{border-color:var(--accent);box-shadow:0 0 0 4px var(--accent-soft),0 3px 0 var(--accent)}
@keyframes flip{0%{transform:rotateY(90deg) scale(.9)}100%{transform:none}}

.reveal-bar{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:12px 14px;background:var(--accent-soft);border:1px solid var(--accent);border-radius:14px;flex-wrap:wrap}
.announce{display:flex;flex-direction:column;gap:2px;min-width:0}
.announce b{font-size:18px;letter-spacing:-.01em}
.announce small{font-size:13px;color:var(--ink-2);font-weight:400;margin-left:6px}
.announce.is-pop b{animation:pop .3s ease}
@keyframes pop{from{transform:scale(.92);opacity:.3}to{transform:none;opacity:1}}
.reveal-actions{display:flex;gap:6px}
.stage-foot{display:flex;align-items:center;justify-content:space-between;gap:10px;flex-wrap:wrap}
.stat{margin:0;font-size:13px;color:var(--ink-2)}
.stat b{font-family:var(--mono);font-weight:500;color:var(--accent-ink)}
.stat .bad{color:var(--warn)}
.foot-actions{display:flex;gap:6px;flex-wrap:wrap}

/* 패널 */
.panel{display:flex;flex-direction:column;gap:12px;min-width:0}
.go{height:56px;border:none;border-radius:16px;background:var(--accent);color:#fff;font-size:17px;font-weight:700;cursor:pointer;box-shadow:0 6px 0 var(--accent-ink);transition:transform .08s,box-shadow .08s}
.go:hover{filter:brightness(1.06)}
.go:active{transform:translateY(4px);box-shadow:0 2px 0 var(--accent-ink)}
.reveal-pick{display:flex;align-items:center;justify-content:space-between;gap:8px;flex-wrap:wrap}
.mini-label{font-size:12px;color:var(--sub)}
.chips{display:flex;gap:4px;flex-wrap:wrap}
.chip{height:30px;padding:0 12px;border:1px solid var(--line-2);background:var(--panel);border-radius:999px;font-size:12.5px;cursor:pointer}
.chip[aria-checked="true"]{background:var(--ink);border-color:var(--ink);color:#fff}
.err{margin:0;padding:10px 12px;border-radius:10px;background:var(--warn-soft);color:var(--warn);font-size:13px;line-height:1.5}
.card{background:var(--panel);border:1px solid var(--line);border-radius:16px;padding:16px;display:flex;flex-direction:column;gap:10px;min-width:0}
.card-head{display:flex;align-items:center;justify-content:space-between;gap:8px}
.card-title{font-size:14px;font-weight:700}
.card-title small{font-weight:400;color:var(--muted);font-size:12px;margin-left:4px}
.count{font-family:var(--mono);font-size:12px;color:var(--accent-ink);background:var(--accent-soft);border-radius:999px;padding:3px 10px}
.dims{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.dim{display:flex;flex-direction:column;gap:4px;font-size:12px;color:var(--sub);min-width:0}
.num-step{display:flex;align-items:center;border:1px solid var(--line-2);border-radius:10px;overflow:hidden;background:var(--surface)}
.num-step button{width:34px;height:38px;border:none;background:transparent;font-size:17px;cursor:pointer;flex-shrink:0;color:var(--ink-2)}
.num-step button:hover{background:var(--hover);color:var(--ink)}
.num-step input{flex:1;min-width:0;width:100%;height:38px;border:none;background:transparent;text-align:center;font-family:var(--mono);font-size:17px;font-weight:500;color:var(--ink);-moz-appearance:textfield;appearance:textfield}
.num-step input::-webkit-inner-spin-button,.num-step input::-webkit-outer-spin-button{-webkit-appearance:none;margin:0}
.num-step input:focus{outline:none;background:var(--accent-soft)}
.check{display:flex;align-items:center;gap:8px;font-size:13px;cursor:pointer}
.check input{width:16px;height:16px;accent-color:var(--accent);margin:0;flex-shrink:0}
.sel{display:flex;align-items:center;justify-content:space-between;gap:8px;font-size:13px}
.sel select{height:34px;padding:0 8px;border:1px solid var(--line-2);border-radius:8px;background:var(--panel);font-size:13px;min-width:0;max-width:210px}
.sel--sm{justify-content:flex-start}
.names{width:100%;min-height:160px;resize:vertical;padding:10px 12px;border:1px solid var(--line-2);border-radius:10px;background:var(--surface);font-size:14px;line-height:1.6}
.names:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-soft)}
.names::placeholder,.text-input::placeholder{color:var(--muted)}
.field{display:flex;flex-direction:column;gap:5px;font-size:13px}
.field small{color:var(--muted);font-size:11.5px;margin-left:4px}
.con-msg{margin:-4px 0 0;font-size:11.5px;color:var(--warn)}
.con-msg:empty{display:none}
.note{margin:0;font-size:12px;color:var(--sub);line-height:1.5}
.fair{margin:0;font-size:12px;color:var(--sub);display:flex;gap:6px;align-items:baseline;line-height:1.5}
.dot{display:inline-block;width:6px;height:6px;border-radius:50%;background:var(--accent);flex-shrink:0;transform:translateY(-1px)}

/* 고정 팝업 */
.pop{position:fixed;inset:0;z-index:30;display:flex;align-items:center;justify-content:center;padding:16px;background:rgba(20,20,18,.42)}
.pop-card{width:100%;max-width:340px;background:var(--panel);border-radius:18px;padding:20px;display:flex;flex-direction:column;gap:12px;box-shadow:0 20px 60px rgba(0,0,0,.25)}
.pop-title{margin:0;font-size:17px}
.pop-sub{margin:-6px 0 0;font-size:13px;color:var(--sub)}
.pop-sel{height:42px;padding:0 10px;border:1px solid var(--line-2);border-radius:10px;background:var(--surface);font-size:15px}
.pop-actions{display:flex;justify-content:flex-end;gap:6px}

.toast{position:fixed;left:50%;bottom:28px;transform:translate(-50%,20px);background:var(--ink);color:#fff;padding:10px 18px;border-radius:999px;font-size:13px;opacity:0;pointer-events:none;transition:opacity .2s,transform .2s;z-index:40}
.toast.is-show{opacity:1;transform:translate(-50%,0)}

@media (max-width:1000px){
  .ss{grid-template-columns:minmax(0,1fr)}
}
@media (max-width:640px){
  .ss{padding:16px 16px 32px;gap:16px}
  .sheet{padding:12px;border-radius:16px}
  .room{--seat-min:41px;--aisle:8px;padding:10px;gap:14px}
  .front{margin:0 2%}
  .grid{gap:8px 4px}
  .seat{height:54px;padding:14px 1px 5px;border-radius:8px}
  .seat-no{left:5px;font-size:9px}
  .seat.is-fixed::after{right:3px;font-size:8.5px;padding:0 3px}
  .seat-name{font-size:12px;letter-spacing:-.04em}
  .seg{width:100%}
  .seg-btn{flex:1;padding:0 6px;font-size:12px}
  .title-input{font-size:17px}
  .foot-actions{width:100%}
  .foot-actions .btn{flex:1;padding:0 8px}
}
@media (prefers-reduced-motion:reduce){
  *{animation:none !important;transition:none !important}
}

/* 인쇄: 자리표만 */
@media print{
  @page{size:landscape;margin:12mm}
  body{background:#fff}
  .tb-site,.tb-info,.tb-footer,.tb-drawer,.topbar,.panel,.stage-tools,.reveal-bar,.stage-foot,.toast,.pop,.ad-slot{display:none !important}
  .ss{display:block;padding:0;max-width:none}
  .sheet{border:none;padding:0}
  .title-input{font-size:24px;border:none}
  .room-scroll{overflow:visible}
  .room{background:#fff;padding:0;min-width:0}
  .seat{box-shadow:none;border:1.5px solid #555;height:70px;break-inside:avoid}
  .seat-name{font-size:16px}
  .seat.is-hidden{background:#fff;border-color:#555}
  .seat.is-fixed::after{display:none}
  .front{-webkit-print-color-adjust:exact;print-color-adjust:exact}
}

/* 다크 모드 (인쇄는 라이트 그대로) — PNG 저장은 항상 밝은 자리표 */
@media screen{
  :root[data-theme="dark"]{
    color-scheme:dark;
    --bg:#131418; --surface:#191a20; --panel:#1e1f26; --panel-soft:#23242c;
    --ink:#eceef3; --ink-hover:#ffffff; --ink-2:#c7cad4; --sub:#9fa3b0; --muted:#878b98;
    --line:#2c2e37; --line-2:#383a45; --line-3:#25262e; --hover:#2a2b33; --soft:#25262e; --track:#33353f;
    --accent:#8ea4ff; --accent-ink:#a9b9ff; --accent-soft:rgba(142,164,255,.16);
    --floor:#1a1b21; --floor-line:rgba(255,255,255,.03);
    --chalk:#24392f; --chalk-ink:#cfe3d4; --wood:#8a6240;
    --desk:#262833; --desk-edge:#3a3d4a;
    --warn:#ff8787; --warn-soft:rgba(255,107,107,.12);
  }
  :root[data-theme="dark"] .btn--solid,:root[data-theme="dark"] .toast,
  :root[data-theme="dark"] .chip[aria-checked="true"]{color:var(--bg)}
  :root[data-theme="dark"] .btn--solid,:root[data-theme="dark"] .chip[aria-checked="true"]{background:var(--accent);border-color:var(--accent)}
  :root[data-theme="dark"] .btn--solid:hover:not(:disabled){background:var(--accent-ink)}
  :root[data-theme="dark"] .go{background:#3b5bdb;box-shadow:0 6px 0 #26399a}
  :root[data-theme="dark"] .go:active{box-shadow:0 2px 0 #26399a}
  :root[data-theme="dark"] .seg-btn.is-active{background:var(--line-2);box-shadow:0 1px 3px rgba(0,0,0,.4)}
  :root[data-theme="dark"] .seat.is-fixed::after{color:var(--bg)}
  :root[data-theme="dark"] .seat.is-hidden{background-color:#3b5bdb;border-color:#5470e0;box-shadow:0 3px 0 #26399a}
  :root[data-theme="dark"] .pop{background:rgba(0,0,0,.6)}
}