: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:#6741d9; /* 잉크 바이올렛 */
  --accent-soft:#efeafd;
  --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)}
.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
.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{background:var(--hover)}
.btn--solid{background:var(--ink);color:#fff;border:none;font-weight:500}
.btn--solid:hover{background:var(--ink-hover)}

/* ---------- 작업 영역 ---------- */
.studio{flex:1;display:flex;flex-direction:column;padding:16px 24px 24px;gap:12px;max-width:1600px;width:100%;margin:0 auto}
.toolbar{display:flex;flex-wrap:wrap;align-items:center;gap:6px;padding:6px;background:var(--panel);border:1px solid var(--line);border-radius:14px}
.tgroup{display:flex;gap:2px;padding-right:6px;border-right:1px solid var(--line-3)}
.tgroup:last-child{border-right:none}
.tgroup.right{margin-left:auto;align-items:center;gap:12px;padding-left:6px}
.tb{min-width:34px;height:34px;padding:0 8px;display:grid;place-items:center;border:none;background:transparent;border-radius:9px;cursor:pointer;font-size:13px;font-weight:600;color:var(--ink-2)}
.tb:hover{background:var(--accent-soft);color:var(--accent)}
.tb:active{transform:translateY(1px)}
.tb.mono{font-family:var(--mono);font-size:12px}
.tb svg{width:18px;height:18px;fill:none;stroke:currentColor;stroke-width:1.5;stroke-linecap:round;stroke-linejoin:round}
.tb svg circle[r="1.5"]{fill:currentColor;stroke:none}
.tb svg text{fill:currentColor;stroke:none;font-family:var(--mono);font-weight:700}
.opt{display:flex;align-items:center;gap:6px;font-size:12.5px;color:var(--ink-2);cursor:pointer;white-space:nowrap}
.opt input{accent-color:var(--accent);margin:0}
.sel{height:32px;border:1px solid var(--line-2);border-radius:999px;background:var(--surface);font:inherit;font-size:12.5px;padding:0 10px;color:var(--ink)}

.mtabs{display:none}
.panes{display:grid;grid-template-columns:1fr 1fr;gap:12px;height:calc(100vh - 230px);min-height:460px}
.pane{position:relative;display:flex;flex-direction:column;min-width:0;min-height:0;border:1px solid var(--line);border-radius:16px;overflow:hidden}
.pane-head{display:flex;align-items:center;justify-content:space-between;gap:10px;height:38px;padding:0 16px;border-bottom:1px solid var(--line-3);flex:none}
.pane-edit{background:#faf8f3}
.pane-edit .pane-head{background:#f3f0e8}
.fname{font-family:var(--mono);font-size:11.5px;color:var(--ink-2);max-width:60%;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;cursor:text}
.saved{font-family:var(--mono);font-size:11px;color:var(--muted)}
#src{flex:1;width:100%;min-height:0;resize:none;border:none;outline:none;margin:0;padding:22px 26px 60px;background:transparent;color:#2a2826;
  font-family:var(--mono),"IBM Plex Sans KR",monospace;font-size:14px;line-height:1.75;tab-size:4;caret-color:var(--accent)}
#src::selection{background:#ddd2fb}
.pane-edit:focus-within{border-color:#cdbff5;box-shadow:0 0 0 3px var(--accent-soft)}
.drop{position:absolute;inset:38px 0 0;display:grid;place-items:center;background:rgba(239,234,253,.92);border:2px dashed var(--accent);border-radius:0 0 16px 16px;color:var(--accent);font-weight:600;pointer-events:none}
.pane-view{background:#fff}
.view-scroll{flex:1;overflow:auto;min-height:0}
.status{display:flex;gap:16px;flex-wrap:wrap;font-family:var(--mono);font-size:11px;color:var(--muted);padding:0 4px}
.status-r{margin-left:auto;font-family:var(--font)}

/* ---------- 미리보기 타이포그래피 ---------- */
.md{max-width:760px;margin:0 auto;padding:32px 40px 80px;color:#24231f;font-size:15.5px;line-height:1.8;word-break:keep-all;overflow-wrap:anywhere}
.md.theme-serif{font-family:"Noto Serif KR",serif;font-size:15.5px;line-height:1.9}
.md>*:first-child{margin-top:0}
.md h1,.md h2,.md h3,.md h4,.md h5,.md h6{font-family:var(--font);line-height:1.35;letter-spacing:-.015em;margin:1.8em 0 .6em;color:#151412;scroll-margin-top:12px}
.md.theme-serif h1,.md.theme-serif h2,.md.theme-serif h3{font-family:"Noto Serif KR",serif;font-weight:700}
.md h1{font-size:2em;font-weight:700;padding-bottom:.35em;border-bottom:2px solid #151412}
.md h2{font-size:1.5em;font-weight:700;padding-bottom:.3em;border-bottom:1px solid var(--line)}
.md h3{font-size:1.22em;font-weight:700}
.md h4{font-size:1.05em;font-weight:700}
.md h5,.md h6{font-size:.95em;font-weight:700;color:var(--ink-2)}
.md p{margin:0 0 1em}
.md a{color:var(--accent);text-decoration:underline;text-decoration-thickness:1px;text-underline-offset:3px}
.md strong{font-weight:700;color:#111}
.md del{color:var(--muted)}
.md mark{background:#fff0a8;padding:0 .15em}
.md code{font-family:var(--mono);font-size:.86em;background:#f3f1ec;border:1px solid #ebe8e1;border-radius:5px;padding:.08em .38em}
.md pre{margin:0 0 1.2em;padding:16px 18px;background:#1f1d1a;color:#ece9e1;border-radius:12px;overflow:auto;line-height:1.6}
.md pre code{background:none;border:none;padding:0;color:inherit;font-size:13px}
.md kbd{font-family:var(--mono);font-size:.78em;padding:.12em .45em;border:1px solid var(--line-2);border-bottom-width:2px;border-radius:5px;background:#fff}
.md blockquote{margin:0 0 1.2em;padding:.6em 1.1em;border-left:3px solid var(--accent);background:#faf8fe;color:#4a4740;border-radius:0 10px 10px 0}
.md blockquote p:last-child{margin-bottom:0}
.md ul,.md ol{margin:0 0 1em;padding-left:1.6em}
.md li{margin:.25em 0}
.md li>ul,.md li>ol{margin:.25em 0 .25em}
.md li::marker{color:var(--accent)}
.md ul.tasks{list-style:none;padding-left:.2em}
.md li.task{display:block}
.md li.task::marker{content:""}
.md li.task>input{width:16px;height:16px;margin:0 .5em 0 0;vertical-align:-2px;accent-color:var(--accent);cursor:pointer}
.md li.task>input:checked+*,.md li.task:has(>input:checked){color:var(--muted)}
.md hr{border:none;height:1px;background:var(--line-2);margin:2em 0;position:relative;overflow:visible}
.md hr::after{content:"✳";position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);background:#fff;padding:0 10px;color:var(--accent);font-size:13px}
.md img{max-width:100%;height:auto;border-radius:8px}
.md .table-wrap{overflow-x:auto;margin:0 0 1.2em}
.md table{border-collapse:collapse;width:100%;font-size:.93em}
.md th,.md td{border-bottom:1px solid var(--line);padding:.55em .8em;text-align:left;vertical-align:top}
.md th{border-bottom:2px solid #24231f;font-weight:700;white-space:nowrap}
.md tbody tr:nth-child(even){background:#faf9f6}
.md .al-center{text-align:center}.md .al-right{text-align:right}.md .al-left{text-align:left}
.md .blocked{color:#b42318;background:#fdecea;border-radius:4px;padding:0 .3em;font-size:.9em}

.toast{position:fixed;left:50%;bottom:28px;transform:translate(-50%,20px);opacity:0;pointer-events:none;background:var(--ink);color:#fff;padding:10px 16px;border-radius:999px;font-size:13px;transition:.25s;z-index:120;max-width:calc(100% - 32px)}
.toast.is-on{opacity:1;transform:translate(-50%,0)}

@media (max-width:860px){
  .studio{padding:12px 16px 20px}
  .tgroup.right{margin-left:0;width:100%;justify-content:flex-start;padding:6px 4px 2px;border-top:1px solid var(--line-3)}
  .mtabs{display:flex;gap:4px}
  .mtab{flex:1;height:36px;border:1px solid var(--line-2);background:transparent;border-radius:999px;font-size:13.5px;cursor:pointer}
  .mtab.is-on{background:var(--ink);color:#fff;border-color:var(--ink)}
  .panes{grid-template-columns:minmax(0,1fr);height:calc(100vh - 260px);min-height:420px}
  .panes[data-view="edit"] .pane-view{display:none}
  .panes[data-view="preview"] .pane-edit{display:none}
  .md{padding:22px 18px 60px;font-size:15px}
  #src{padding:16px 16px 40px;font-size:13.5px}
  .status-r{margin-left:0;width:100%}
}
@media (max-width:640px){
  .topbar{padding:14px 16px}
  .actions .btn{height:34px;padding:0 11px;font-size:12.5px}
  .toolbar{gap:2px;padding:4px}
  .tgroup{padding-right:2px}
  .tb{min-width:30px;height:32px;padding:0 5px}
}
@media (prefers-reduced-motion:reduce){*{transition:none !important}}

/* ---------- 인쇄: 미리보기만 A4 ---------- */
@page{size:A4;margin:18mm 17mm}
@media print{
  html,body{background:#fff !important}
  body>:not(.app){display:none !important}
  .topbar,.toolbar,.mtabs,.pane-edit,.pane-head,.status,.toast{display:none !important}
  .app,.studio{display:block !important;padding:0 !important;margin:0 !important;max-width:none !important;min-height:0 !important}
  .panes{display:block !important;height:auto !important;min-height:0 !important}
  .panes .pane-view{display:block !important;border:none !important;border-radius:0 !important;overflow:visible !important}
  .view-scroll{overflow:visible !important}
  .md{max-width:none;padding:0;font-size:10.5pt}
  .md pre{white-space:pre-wrap;break-inside:avoid;-webkit-print-color-adjust:exact;print-color-adjust:exact}
  .md h1,.md h2,.md h3{break-after:avoid}
  .md tr,.md img,.md blockquote{break-inside:avoid}
  .md a{color:inherit}
}

/* 다크 모드 (화면 전용 — 인쇄/PDF·복사 HTML은 라이트 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:#a58cff; --accent-soft:rgba(165,140,255,.16);
  }
  :root[data-theme="dark"] .btn--solid,:root[data-theme="dark"] .toast,:root[data-theme="dark"] .mtab.is-on{color:var(--bg)}
  :root[data-theme="dark"] .pane{border-color:var(--line-2)}
  :root[data-theme="dark"] .pane-edit{background:#1b1a20}
  :root[data-theme="dark"] .pane-edit .pane-head{background:#212027}
  :root[data-theme="dark"] #src{color:#e2e0e8}
  :root[data-theme="dark"] #src::selection{background:rgba(165,140,255,.38)}
  :root[data-theme="dark"] .pane-edit:focus-within{border-color:#5d4f99}
  :root[data-theme="dark"] .drop{background:rgba(31,30,38,.94)}
  :root[data-theme="dark"] .pane-view{background:#1f1e26}
  :root[data-theme="dark"] .md{color:#dddbe4}
  :root[data-theme="dark"] .md h1,:root[data-theme="dark"] .md h2,:root[data-theme="dark"] .md h3,:root[data-theme="dark"] .md h4{color:#f4f3f8}
  :root[data-theme="dark"] .md h1{border-bottom-color:var(--ink-2)}
  :root[data-theme="dark"] .md strong{color:#fff}
  :root[data-theme="dark"] .md mark{background:rgba(250,214,80,.32);color:inherit}
  :root[data-theme="dark"] .md code{background:#2a2932;border-color:#35343e}
  :root[data-theme="dark"] .md pre{background:#141318;border:1px solid var(--line-2)}
  :root[data-theme="dark"] .md pre code{background:none;border:none}
  :root[data-theme="dark"] .md kbd{background:#2a2932}
  :root[data-theme="dark"] .md blockquote{background:rgba(165,140,255,.08);color:#c4c1cd}
  :root[data-theme="dark"] .md hr::after{background:#1f1e26}
  :root[data-theme="dark"] .md th{border-bottom-color:var(--ink-2)}
  :root[data-theme="dark"] .md tbody tr:nth-child(even){background:#24232b}
  :root[data-theme="dark"] .md .blocked{color:#ffaaa3;background:rgba(229,72,77,.16)}
}