: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:#d9481c; --accent-soft:rgba(217,72,28,.12); --on-accent:#fff;
  --err:#b3261e;
  --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{font:inherit;color:inherit}
.mono-label{font-family:var(--mono);font-size:11px;letter-spacing:.12em;color:var(--muted);font-weight:400}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
.hint{font-size:12px;line-height:1.55;color:var(--muted);margin:0}
.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;margin:0}
.actions{display:flex;align-items:center;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--accent{background:var(--accent);color:var(--on-accent);border:none;font-weight:500}
.btn--accent:hover{filter:brightness(1.08);background:var(--accent)}
.btn--light{border-color:rgba(255,255,255,.22);color:#efeee9}
.btn--light:hover{background:rgba(255,255,255,.08)}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
.text-input{width:100%;height:38px;padding:0 12px;background:var(--surface);border:1px solid var(--line-2);border-radius:10px;font:inherit;font-size:14px;color:var(--ink)}
.text-input:focus,.sel:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-soft)}
.text-input.is-bad{border-color:var(--err)}
.sel{height:36px;padding:0 12px;background:var(--surface);color:var(--ink);border:1px solid var(--line-2);border-radius:10px;font:inherit;font-size:13px}
.sel--pill{border-radius:999px;padding:0 14px}

/* 레이아웃 */
.layout{flex:1;display:flex;flex-wrap:wrap;align-items:flex-start;min-height:0}
.panel{flex:1 1 320px;max-width:380px;min-width:0;align-self:stretch;border-right:1px solid var(--line);padding:22px 22px 40px;display:flex;flex-direction:column;gap:20px;background:var(--panel)}
.stage{flex:999 1 520px;min-width:0;display:flex;flex-direction:column;gap:16px;padding:28px 28px 48px}
.group{display:flex;flex-direction:column;gap:10px}
.group--line{border-top:1px solid var(--line-3);padding-top:18px}
.group-head{display:flex;justify-content:space-between;align-items:center;gap:8px;flex-wrap:wrap}
.g-title{margin:0;font-size:14px;font-weight:700;letter-spacing:-.01em;display:flex;align-items:baseline;gap:8px}
.fld{display:flex;flex-direction:column;gap:6px;min-width:0}
.fld--inline{flex-direction:row;align-items:center;gap:10px}
.fld-k{font-size:12.5px;color:var(--ink-2)}
.fld-in{position:relative;display:block;width:110px}
.fld-in input{width:100%;height:38px;padding:0 32px 0 10px;background:var(--surface);color:var(--ink);border:1px solid var(--line-2);border-radius:10px;font-family:var(--mono);font-size:14px;text-align:right}
.fld-in input:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-soft)}
.fld-in i{position:absolute;right:10px;top:50%;transform:translateY(-50%);font-style:normal;font-family:var(--mono);font-size:11px;color:var(--muted);pointer-events:none}
.pair{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:8px}
.check{display:flex;align-items:flex-start;gap:8px;font-size:13px;color:var(--ink-2);cursor:pointer;line-height:1.45}
.check input{width:16px;height:16px;margin:2px 0 0;accent-color:var(--accent);flex:0 0 auto}
.check--sm{font-size:12px}

/* 스테퍼 · 트랙 */
.stepper{display:flex;align-items:center;gap:2px;background:var(--soft);border-radius:999px;padding:3px}
.step-btn{width:30px;height:30px;border:none;border-radius:999px;background:transparent;font-size:16px;cursor:pointer;color:var(--ink-2)}
.step-btn:hover:not(:disabled){background:var(--panel);color:var(--ink)}
.step-btn:disabled{opacity:.35;cursor:default}
.step-n{min-width:26px;text-align:center;font-family:var(--mono);font-size:13px;font-weight:500}
.tracks{display:flex;flex-direction:column;gap:6px}
.track{display:grid;grid-template-columns:28px minmax(0,1fr);gap:6px;align-items:center}
.track-i{font-family:var(--mono);font-size:11px;color:var(--muted);text-align:center}
.track input{width:100%;height:34px;padding:0 10px;background:var(--surface);color:var(--ink);border:1px solid var(--line-2);border-radius:8px;font-family:var(--mono);font-size:13px}
.track input:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-soft)}
.track input.is-bad{border-color:var(--err);background:rgba(179,38,30,.05)}
.track-err{grid-column:2;font-size:11.5px;color:var(--err);margin:0}
.quick{display:flex;flex-wrap:wrap;gap:6px;align-items:center}
.quick .fld-k{margin-right:2px;font-size:12px;color:var(--muted)}
.chip{height:28px;padding:0 10px;border:1px solid var(--line-2);border-radius:999px;background:transparent;font-family:var(--mono);font-size:11.5px;color:var(--ink-2);cursor:pointer;white-space:nowrap}
.chip:hover{border-color:var(--accent);color:var(--ink)}

/* 슬라이더 */
.field{display:flex;flex-direction:column;gap:6px}
.field-head{display:flex;justify-content:space-between;align-items:center;gap:8px;font-size:12.5px;color:var(--ink-2)}
.field-head .tb-num,.pv-width .tb-num{width:58px;height:30px;background:var(--surface);border-color:var(--line-2);color:var(--ink)}
.field .tb-presets{margin-top:0;gap:4px}
.field .tb-presets button{height:26px;min-width:0;padding:0 9px;font-size:11.5px}
input[type=range]{width:100%;accent-color:var(--accent);margin:0}

/* 미리보기 */
.pv-card{background:var(--panel);border:1px solid var(--line);border-radius:18px;padding:18px 18px 16px;display:flex;flex-direction:column;gap:12px;min-width:0}
.pv-head{display:flex;justify-content:space-between;align-items:flex-end;gap:12px;flex-wrap:wrap}
.pv-title{display:flex;flex-direction:column;gap:3px;min-width:0;flex:1 1 260px}
.pv-width{display:flex;align-items:center;gap:8px}
.pv-card > .tb-presets{margin-top:0}
.pv-outer{position:relative;padding-right:22px;overflow:hidden;min-width:0}
.pv-frame{position:relative;background:#fbfbf9;color:#1c1c1a;border-radius:12px;box-shadow:inset 0 0 0 1px #e3e1db;padding:30px 16px 16px;transform-origin:0 0}
.ruler{position:relative;height:0}
.rl{position:absolute;top:-24px;height:18px;display:flex;align-items:center;justify-content:center;gap:4px;border-bottom:1px solid #d9d6ce;font-family:var(--mono);font-size:10px;color:#7a776f;white-space:nowrap;overflow:hidden}
.rl b{font-weight:500;color:#55534d}
.g{position:relative;display:grid;touch-action:none;user-select:none;-webkit-user-select:none}
.cell{min-height:56px;min-width:40px;border:1.5px dashed #cfccc3;border-radius:8px;background:transparent;font-family:var(--mono);font-size:10px;color:#a3a097;cursor:crosshair;display:flex;align-items:flex-start;justify-content:flex-start;padding:5px 6px;z-index:1;transition:background .1s,border-color .1s}
.cell:hover{border-color:#a3a097;background:rgba(0,0,0,.02)}
.cell:focus-visible{outline:2px solid var(--accent);outline-offset:1px}
.cell.is-sel{background:rgba(217,72,28,.14);border-color:#d9481c;border-style:solid;color:#b33a14}
.cell.is-anchor{box-shadow:inset 0 0 0 2px #d9481c}
.area{position:relative;z-index:2;pointer-events:none;border-radius:8px;padding:8px 10px;display:flex;align-items:flex-start;justify-content:space-between;gap:6px;min-width:0;min-height:40px;overflow:hidden;box-shadow:inset 0 0 0 1.5px rgba(0,0,0,.14)}
.area-name{font-family:var(--mono);font-size:12px;font-weight:500;color:#1c1c1a;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.area-x{pointer-events:auto;flex:0 0 auto;width:22px;height:22px;border:none;border-radius:999px;background:rgba(255,255,255,.75);color:#55534d;font-size:13px;line-height:1;cursor:pointer}
.area-x:hover{background:#fff;color:#b3261e}
.g.is-stacked .cell{display:none}
.g.is-stacked .area{min-height:56px}
.g.is-sel-mode .area{opacity:.55}
.pv-handle{position:absolute;top:0;bottom:0;width:22px;cursor:ew-resize;touch-action:none;display:flex;align-items:center;justify-content:center}
.pv-handle span{width:6px;height:44px;border-radius:999px;background:var(--accent);box-shadow:0 0 0 3px var(--panel)}
.pv-handle:hover span,.pv-handle.is-drag span{height:60px}

/* 이름 입력 */
.namebar{display:flex;flex-wrap:wrap;gap:8px;align-items:center;padding:10px;border-radius:14px;background:var(--accent-soft);animation:pop .18s ease-out}
.namebar .text-input{flex:1 1 180px;width:auto;height:36px;background:var(--panel)}
.nb-sel{font-family:var(--mono);font-size:12px;color:var(--accent);font-weight:500;white-space:nowrap}
.nb-err{flex-basis:100%;margin:0;font-size:12px;color:var(--err)}
@keyframes pop{from{opacity:0;transform:translateY(-4px)}to{opacity:1;transform:none}}

/* 영역 목록 */
.areas{display:flex;flex-wrap:wrap;gap:6px}
.areas:empty{display:none}
.ach{display:flex;align-items:center;gap:6px;height:34px;padding:0 4px 0 6px;border:1px solid var(--line-2);border-radius:999px;background:var(--panel-soft)}
.ach i{width:16px;height:16px;border-radius:5px;flex:0 0 auto;box-shadow:inset 0 0 0 1px rgba(0,0,0,.12)}
.ach input{width:9ch;min-width:0;height:26px;padding:0 6px;border:1px solid transparent;border-radius:6px;background:transparent;font-family:var(--mono);font-size:12px;color:var(--ink)}
.ach input:hover{border-color:var(--line-2)}
.ach input:focus{outline:none;border-color:var(--accent);background:var(--panel)}
.ach input.is-bad{border-color:var(--err)}
.ach span{font-family:var(--mono);font-size:10.5px;color:var(--muted);white-space:nowrap}
.ach button{width:26px;height:26px;border:none;border-radius:999px;background:transparent;color:var(--muted);cursor:pointer;font-size:14px}
.ach button:hover{background:var(--hover);color:var(--err)}

/* 코드 */
.code-card{display:flex;flex-direction:column;gap:12px;padding:14px 16px 16px;background:#1c1c1a;border-radius:18px;color:#efeee9;min-width:0}
.code-head{display:flex;justify-content:space-between;align-items:center;gap:10px;flex-wrap:wrap}
.code-tabs{display:flex;gap:2px;background:rgba(255,255,255,.07);border-radius:999px;padding:3px}
.ctab{height:30px;padding:0 14px;border:none;border-radius:999px;background:transparent;color:#a9a69c;font-family:var(--mono);font-size:12px;cursor:pointer}
.ctab[aria-selected="true"]{background:#efeee9;color:#1c1c1a;font-weight:500}
.code-actions{display:flex;gap:8px;flex-wrap:wrap}
.code{margin:0;font-family:var(--mono);font-size:12.5px;line-height:1.7;white-space:pre;overflow:auto;max-height:440px;color:#efeee9;padding:2px}
.code:focus-visible{outline:2px solid #ff9d7a;outline-offset:2px;border-radius:6px}
.code .s{color:#ffc58a}
.code .p{color:#9fd3ff}
.code .t{color:#ff9d7a}
.code .c{color:#8a877f}

/* 토스트 */
.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:50;max-width:calc(100% - 32px);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.toast.is-on{opacity:1;transform:translate(-50%,0)}

@media (max-width:900px){
  .panel{max-width:none;border-right:none;border-bottom:1px solid var(--line)}
}
@media (max-width:640px){
  .topbar{padding:14px 16px}
  .actions{width:100%}
  .preset-pick{flex:1}
  .preset-pick .sel{width:100%}
  .panel{padding:20px 16px 28px}
  .stage{padding:20px 16px 32px}
  .pv-card{padding:14px 12px}
  .pv-frame{padding:28px 10px 10px}
  .cell{min-width:28px;min-height:48px}
  .track input,.text-input,.fld-in input{font-size:16px}
  .code-actions,.code-actions .btn{flex:1 1 auto}
}
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{transition:none !important;animation:none !important}
}

/* 다크 모드 (인쇄는 라이트 그대로) — 레이아웃 미리보기는 웹페이지 모습이라 밝게 둠 */
@media screen{
  :root[data-theme="dark"]{
    color-scheme:dark;
    --bg:#16141a; --surface:#1c1a20; --panel:#211f26; --panel-soft:#26242b;
    --ink:#eeebf0; --ink-hover:#ffffff; --ink-2:#ccc8d1; --sub:#a39fab; --muted:#8d8995;
    --line:#302d36; --line-2:#3b3842; --line-3:#28262d; --hover:#2c2a32; --soft:#28262d; --track:#36333d;
    --accent:#ff8a63; --accent-soft:rgba(255,138,99,.16); --on-accent:#1a1210;
    --err:#ff8a80;
  }
  :root[data-theme="dark"] .toast,:root[data-theme="dark"] .tb-presets button[aria-pressed="true"]{color:var(--bg)}
  :root[data-theme="dark"] .code-card{background:#0f0e12;box-shadow:inset 0 0 0 1px var(--line-2)}
  :root[data-theme="dark"] .track input.is-bad{background:rgba(255,138,128,.08)}
  :root[data-theme="dark"] .pv-frame{box-shadow:inset 0 0 0 1px #e3e1db,0 0 0 1px var(--line-2)}
}