: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:#14b8a6; /* 터미널 틸 */
  --ed-bg:#15181d; --ed-bg2:#1b1f26; --ed-line:#2a2f38; --ed-text:#d8dee9; --ed-mute:#6b7383;
  --c-key:#7dd3fc; --c-str:#a7e3a1; --c-num:#f8c47c; --c-bool:#f39bd2; --c-null:#b4a7f5; --c-punc:#8a93a6;
  --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)}
.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;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--sm{height:32px;padding:0 13px;font-size:12.5px}
.btn--xs{height:26px;padding:0 10px;font-size:11.5px}
.btn--accent{background:var(--ink);color:#fff;border-color:var(--ink);font-weight:500}
.btn--accent:hover{background:var(--ink-hover)}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px}

.jf{width:100%;max-width:1400px;margin:0 auto;padding:22px 28px 48px;display:flex;flex-direction:column;gap:12px}

.toolbar{display:flex;align-items:center;gap:10px;flex-wrap:wrap}
.tb-right{margin-left:auto;display:flex;gap:6px}
.seg{display:flex;background:var(--panel);border:1px solid var(--line);border-radius:999px;padding:3px;gap:2px}
.seg-btn{height:28px;padding:0 13px;border:none;border-radius:999px;background:transparent;cursor:pointer;font-size:12.5px;color:var(--ink-2)}
.seg-btn.is-on{background:var(--ink);color:#fff}
.seg.is-dim{opacity:.4;pointer-events:none}
.toggle{display:inline-flex;align-items:center;gap:8px;height:36px;padding:0 14px 0 10px;border:1px solid var(--line);border-radius:999px;background:var(--panel);font-size:12.5px;cursor:pointer}
.toggle input{appearance:none;-webkit-appearance:none;width:28px;height:16px;border-radius:999px;background:var(--line-2);position:relative;margin:0;cursor:pointer;transition:background .15s}
.toggle input::after{content:"";position:absolute;top:2px;left:2px;width:12px;height:12px;border-radius:50%;background:#fff;transition:transform .15s}
.toggle input:checked{background:var(--accent)}
.toggle input:checked::after{transform:translateX(12px)}

.status{display:flex;align-items:center;gap:10px;flex-wrap:wrap;padding:10px 14px;border-radius:12px;background:var(--panel);border:1px solid var(--line);min-height:46px;font-size:13px}
.badge{font-family:var(--mono);font-size:11px;font-weight:700;letter-spacing:.08em;padding:4px 9px;border-radius:6px;background:var(--soft);color:var(--ink-2)}
.badge--ok{background:#d6f5ef;color:#0b6b5f}
.badge--err{background:#fde2dd;color:#b4311b}
.badge--warn{background:#fff1cc;color:#8a5a00}
.status-msg{color:var(--ink-2);min-width:0}
.status-msg b{color:var(--ink)}
.stats{margin-left:auto;display:flex;gap:12px;font-family:var(--mono);font-size:11.5px;color:var(--sub);flex-wrap:wrap}
.stats b{color:var(--ink);font-weight:500}

.panes{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:12px}
.pane{display:flex;flex-direction:column;background:var(--ed-bg);border-radius:14px;overflow:hidden;min-width:0;border:1px solid #0d0f12}
.pane-head{display:flex;align-items:center;justify-content:space-between;gap:8px;height:44px;padding:0 10px 0 16px;background:var(--ed-bg2);border-bottom:1px solid var(--ed-line);color:var(--ed-text)}
.pane-title{font-size:12.5px;font-weight:700;letter-spacing:.02em}
.pane .mono-label{color:var(--ed-mute)}

/* 입력 에디터 + 가상 줄번호 */
.editor{position:relative;height:620px;display:flex}
.gutter{position:relative;flex:none;width:56px;overflow:hidden;background:var(--ed-bg2);border-right:1px solid var(--ed-line)}
.gutter-inner{position:absolute;left:0;right:0;top:0;will-change:transform}
.gutter-inner span{display:block;height:21px;line-height:21px;padding-right:10px;text-align:right;font-family:var(--mono);font-size:11.5px;color:var(--ed-mute)}
.gutter-inner span.is-err{color:#fff;background:#c2412b}
#input{flex:1;min-width:0;height:100%;margin:0;border:none;outline:none;resize:none;padding:10px 14px;background:transparent;color:var(--ed-text);
  font-family:var(--mono);font-size:13px;line-height:21px;white-space:pre;overflow:auto;tab-size:2;caret-color:var(--accent);position:relative;z-index:1}
#input::placeholder{color:#4d5565}
#input::selection{background:rgba(20,184,166,.35)}
.err-line{position:absolute;left:56px;right:0;height:21px;background:rgba(239,68,68,.18);border-top:1px solid rgba(239,68,68,.5);border-bottom:1px solid rgba(239,68,68,.5);pointer-events:none;z-index:2}

/* 출력 */
.tabs{display:flex;gap:2px;background:#0f1216;border-radius:999px;padding:3px}
.tab{height:26px;padding:0 13px;border:none;border-radius:999px;background:transparent;color:#9aa3b5;font-size:12px;cursor:pointer}
.tab.is-on{background:#2a303b;color:#fff}
.out-body{position:relative;height:620px;display:flex;flex-direction:column;min-height:0}
.code{flex:1;position:relative;margin:0;overflow:auto;font-family:var(--mono);font-size:13px;line-height:21px;color:var(--ed-text);tab-size:2;min-height:0}
.code.is-empty::before{content:"결과가 여기에 나와요.";position:absolute;left:16px;top:10px;color:#4d5565}
.v-spacer{width:1px}
.v-layer{position:absolute;left:0;top:0;min-width:100%}
.v-line{display:flex;height:21px;white-space:pre}
.v-n{position:sticky;left:0;flex:none;width:52px;padding-right:12px;text-align:right;color:var(--ed-mute);background:var(--ed-bg);user-select:none;font-size:11.5px}
.v-t{padding-right:24px}
.v-cut{color:#f8c47c;font-style:italic}
.code.is-stale{opacity:.35}
.j-k{color:var(--c-key)}.j-s{color:var(--c-str)}.j-n{color:var(--c-num)}.j-b{color:var(--c-bool)}.j-z{color:var(--c-null)}.j-p{color:var(--c-punc)}

.tree-wrap{flex:1;display:flex;flex-direction:column;min-height:0}
.tree-bar{display:flex;align-items:center;gap:6px;padding:8px 12px;border-bottom:1px solid var(--ed-line);flex-wrap:wrap}
.tree-bar .btn{color:#cfd6e3;border-color:#363c48}
.tree-bar .btn:hover{background:#262b34}
.path{flex:1;min-width:120px;font-family:var(--mono);font-size:11.5px;color:var(--c-key);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.tree{flex:1;overflow:auto;padding:8px 6px 16px;font-family:var(--mono);font-size:13px;line-height:22px;color:var(--ed-text);min-height:0}
.t-row{display:flex;align-items:baseline;gap:6px;padding:0 8px 0 0;border-radius:5px;cursor:pointer;white-space:nowrap}
.t-row:hover{background:#20252d}
.t-row.is-sel{background:#1f3b3a}
.t-tog{width:16px;flex:none;text-align:center;color:var(--ed-mute);font-size:10px;transition:transform .12s;display:inline-block}
.t-row.is-open .t-tog{transform:rotate(90deg)}
.t-key{color:var(--c-key)}
.t-idx{color:var(--ed-mute)}
.t-sum{color:var(--ed-mute);font-size:12px}
.t-type{font-size:10px;letter-spacing:.06em;color:#5c6577;border:1px solid #333a46;border-radius:4px;padding:0 4px;margin-left:4px}
.t-kids{margin-left:15px;border-left:1px dashed #2f3540;padding-left:4px}
.t-more{margin:4px 0 4px 22px;height:24px;padding:0 10px;font-size:11.5px;border-radius:999px;border:1px solid #363c48;background:transparent;color:#cfd6e3;cursor:pointer}
.t-v{overflow:hidden;text-overflow:ellipsis;min-width:0}

.err-box{flex:1;padding:22px;color:var(--ed-text);display:flex;flex-direction:column;gap:14px;overflow:auto}
.err-title{font-size:15px;line-height:1.6}
.err-title b{color:#ff8a75}
.err-title small{display:block;font-size:12.5px;color:#9aa3b5;margin-top:4px}
.err-snip{margin:0;padding:14px 16px;background:#0f1216;border-radius:10px;border:1px solid #3a2523;font-family:var(--mono);font-size:12.5px;line-height:1.7;white-space:pre;overflow:auto}
.err-snip .ln{color:var(--ed-mute)}
.err-snip .caret{color:#ff6b55;font-weight:700}
.err-snip .bad{background:#c2412b;color:#fff;border-radius:2px}
.err-box .btn{align-self:flex-start;color:#fff;border-color:#4a505c}
.err-box .btn:hover{background:#262b34}
.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
.btn--file{display:inline-flex;align-items:center}
input[type=file]:focus-visible+.btn,.btn--file:focus-within{outline:2px solid var(--accent)}
.bigfile{display:flex;align-items:center;gap:10px;padding:8px 12px 8px 16px;background:#123733;color:#c6f3ec;font-size:12.5px;flex-wrap:wrap}
.bigfile .btn{color:#fff;border-color:#2c6b63}
.editor.is-drop{box-shadow:inset 0 0 0 2px var(--accent)}
.foot-note{margin:4px 0 0;font-size:12px;color:var(--sub)}

.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}
.toast.is-on{opacity:1;transform:translate(-50%,0)}

@media (max-width:900px){
  .panes{grid-template-columns:1fr}
  .editor{height:300px}
  .out-body{height:480px}
}
@media (max-width:640px){
  .topbar{padding:14px 16px}
  .jf{padding:16px 16px 40px}
  .tb-right{margin-left:0;width:100%}
  .tb-right .btn{flex:1}
  .stats{margin-left:0;width:100%}
  .gutter{width:44px}
  .err-line{left:44px}
  #input,.code{font-size:12px}
  .v-n{width:40px;padding-right:8px}
}
@media (prefers-reduced-motion:reduce){ .t-tog,.toggle input,.toggle input::after,.toast{transition:none} }

/* 다크 모드 (인쇄는 라이트 그대로) */
@media screen{
  :root[data-theme="dark"]{
    color-scheme:dark;
    --bg:#121417; --surface:#171a1e; --panel:#1c1f24; --panel-soft:#212429;
    --ink:#e8ebef; --ink-hover:#ffffff; --ink-2:#c3c8cf; --sub:#9aa0aa; --muted:#868c96;
    --line:#2b2f36; --line-2:#363b43; --line-3:#23262c; --hover:#262a30; --soft:#252930; --track:#30343c;
    --accent:#2dd4bf;
  }
  :root[data-theme="dark"] .btn--accent,:root[data-theme="dark"] .seg-btn.is-on,:root[data-theme="dark"] .toast{color:var(--bg)}
  :root[data-theme="dark"] .btn--accent{background:var(--accent);border-color:var(--accent)}
  :root[data-theme="dark"] .btn--accent:hover{background:#5eead4;border-color:#5eead4}
  :root[data-theme="dark"] .pane{border-color:var(--line-2)}
  :root[data-theme="dark"] .badge--ok{background:rgba(45,212,191,.16);color:#5eead4}
  :root[data-theme="dark"] .badge--err{background:rgba(248,113,113,.16);color:#fca5a5}
  :root[data-theme="dark"] .badge--warn{background:rgba(251,191,36,.16);color:#fcd34d}
}