:root{
  --bg:#F3F3F1;--surface:#FFFFFF;--surface-sunken:#E9E9E6;--line:#D2D4D4;--line-strong:#B8BBBC;
  --ink:#1A1C1E;--ink-2:#4A4F54;--ink-3:#5E646A;
  --accent:#3C4852;--accent-hover:#2C363E;--accent-soft:#E3E7EA;--accent-weak:#9AA6AE;--on-accent:#FFFFFF;
  --code-bg:#EDEEEC;--hl-1:#8A3A2E;--hl-2:#2F6B8A;--hl-3:#5E6B2A;--hl-4:#6A4C93;--hl-c:#5E646A;
  --pop:0 8px 24px rgb(0 0 0 / .08);
  --font:"Inter","Noto Sans JP",system-ui,-apple-system,"Hiragino Sans","Yu Gothic UI",sans-serif;
  --mono:"BIZ UDGothic","BIZ UDゴシック",ui-monospace,"MS Gothic",monospace;
  --ease:cubic-bezier(.2,.8,.2,1);
  color-scheme:light;
}
@media (prefers-color-scheme:dark){
  :root:not([data-theme="light"]){
    --bg:#151617;--surface:#1B1D1F;--surface-sunken:#232628;--line:#2E3134;--line-strong:#3E4246;
    --ink:#E7E8E8;--ink-2:#B4B8BB;--ink-3:#8F959A;
    --accent:#A9B8C3;--accent-hover:#C0CCD5;--accent-soft:#252B30;--accent-weak:#546470;--on-accent:#121415;
    --code-bg:#242729;--hl-1:#E59A8C;--hl-2:#7FC0DE;--hl-3:#B5C77A;--hl-4:#B9A1E0;--hl-c:#8F959A;
    --pop:0 8px 24px rgb(0 0 0 / .35);color-scheme:dark;
  }
}
:root[data-theme="dark"]{
  --bg:#151617;--surface:#1B1D1F;--surface-sunken:#232628;--line:#2E3134;--line-strong:#3E4246;
  --ink:#E7E8E8;--ink-2:#B4B8BB;--ink-3:#8F959A;
  --accent:#A9B8C3;--accent-hover:#C0CCD5;--accent-soft:#252B30;--accent-weak:#546470;--on-accent:#121415;
  --code-bg:#242729;--hl-1:#E59A8C;--hl-2:#7FC0DE;--hl-3:#B5C77A;--hl-4:#B9A1E0;--hl-c:#8F959A;
  --pop:0 8px 24px rgb(0 0 0 / .35);color-scheme:dark;
}

*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;min-height:100vh;background:var(--bg);color:var(--ink);font:400 15px/1.75 var(--font);-webkit-font-smoothing:antialiased;display:flex;flex-direction:column}
button,input,textarea,select{font:inherit;color:inherit}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
[hidden]{display:none!important}
.sprite{position:absolute;width:0;height:0;overflow:hidden}
.ic{width:18px;height:18px;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round;flex-shrink:0}

/* header */
.hdr,.privacy,main{width:100%;max-width:1600px;margin-left:auto;margin-right:auto}
.hdr{display:flex;justify-content:space-between;align-items:center;padding:18px 28px 6px}
.logo{display:inline-flex;align-items:center;gap:.42em;font:500 19px/1 Inter,sans-serif;letter-spacing:.06em;color:var(--ink);text-decoration:none}
.logo svg{width:1.2em;height:1.2em;flex-shrink:0}
.icon-btn{width:36px;height:36px;border-radius:8px;border:1px solid var(--line);background:var(--surface);cursor:pointer;display:inline-grid;place-items:center;color:var(--ink-2);transition:border-color .15s var(--ease),color .15s var(--ease)}
.icon-btn:hover{border-color:var(--line-strong);color:var(--ink)}
.privacy{display:flex;gap:6px;align-items:center;font-size:12px;color:var(--ink-3);padding:0 28px 10px;margin-top:0;margin-bottom:0}
.privacy .ic{width:14px;height:14px}
.privacy .short{display:none}
main{padding:0 28px;flex:1}

/* toolbar */
.toolbar{display:flex;flex-wrap:wrap;gap:4px 4px;align-items:center;padding:6px;background:var(--surface);border:1px solid var(--line);border-bottom:0;border-radius:10px 10px 0 0}
.tgroup{display:flex;gap:2px}
.vr{width:1px;height:20px;background:var(--line);margin:0 4px}
.tb{min-width:34px;height:32px;padding:0 8px;border:1px solid transparent;border-radius:7px;background:transparent;color:var(--ink-2);cursor:pointer;display:inline-flex;align-items:center;justify-content:center;gap:5px;font-size:14px;line-height:1;transition:background .12s var(--ease),color .12s var(--ease)}
.tb:hover:not(:disabled){background:var(--accent-soft);color:var(--ink)}
.tb.txt{font-family:Inter,"Noto Sans JP",sans-serif;font-size:13px;font-weight:600}
.hist-btn{background:var(--accent-soft);border-color:var(--accent-weak);color:var(--accent);font-size:13px;font-weight:600;padding:0 12px 0 9px}
.hist-btn:hover:not(:disabled){background:var(--accent);color:var(--on-accent)}
.tb:disabled{opacity:.5;cursor:default}
.hist-btn:disabled{background:transparent;border-color:var(--line-strong);color:var(--ink-3)}

/* view bar */
.viewbar{display:flex;flex-wrap:wrap;align-items:center;gap:8px 14px;padding:8px 2px 8px;font-size:13px}
.seg{display:inline-flex;border:1px solid var(--line-strong);border-radius:8px;overflow:hidden;background:var(--surface)}
.seg button{height:30px;padding:0 12px;border:0;background:transparent;color:var(--ink-2);cursor:pointer;font-size:13px;display:inline-flex;align-items:center;gap:5px;white-space:nowrap}
.seg button+button{border-left:1px solid var(--line)}
.seg button:hover{color:var(--ink)}
.seg button[aria-pressed="true"]{background:var(--accent);color:var(--on-accent)}
.seg .ic{width:16px;height:16px}
.chk{display:inline-flex;align-items:center;gap:6px;color:var(--ink-2);cursor:pointer}
.chk input{accent-color:var(--accent);width:15px;height:15px;margin:0}
.stats{margin-left:auto;color:var(--ink-3);font-variant-numeric:tabular-nums;white-space:nowrap}

/* studio: editor + preview, size-adjustable both ways */
.studio{--a:1fr;--b:1fr;--sp:10px;display:grid;height:var(--studio-h,max(380px,calc(100dvh - 330px)));min-height:240px;border:1px solid var(--line);border-radius:0 0 0 0;background:var(--surface);overflow:hidden}
.studio[data-layout="cols"]{grid-template-columns:minmax(0,var(--a)) var(--sp) minmax(0,var(--b));grid-template-rows:minmax(0,1fr)}
.studio[data-layout="rows"]{grid-template-rows:minmax(0,var(--a)) var(--sp) minmax(0,var(--b));grid-template-columns:minmax(0,1fr)}
.studio[data-view="edit"],.studio[data-view="preview"]{grid-template-columns:minmax(0,1fr);grid-template-rows:minmax(0,1fr)}
.studio[data-view="edit"] .splitter,.studio[data-view="edit"] .pane-prev,.studio[data-view="preview"] .splitter,.studio[data-view="preview"] .pane-edit{display:none}
.pane{min-width:0;min-height:0;position:relative;overflow:hidden}
.editor{display:block;width:100%;height:100%;resize:none;border:0;outline:0;margin:0;padding:18px 20px;background:var(--surface);color:var(--ink);font:400 14.5px/1.85 var(--mono);tab-size:2;overflow:auto;white-space:pre-wrap;overflow-wrap:anywhere}
.editor:focus-visible{outline:2px solid var(--accent);outline-offset:-2px}
.editor::placeholder{color:var(--ink-3)}
.pane-prev{background:var(--bg);overflow:auto}
.splitter{position:relative;background:var(--surface-sunken);touch-action:none;user-select:none;display:grid;place-items:center;z-index:2}
.studio[data-layout="cols"] .splitter{cursor:col-resize;border-left:1px solid var(--line);border-right:1px solid var(--line)}
.studio[data-layout="rows"] .splitter{cursor:row-resize;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.splitter i{display:block;background:var(--accent-weak);border-radius:2px;transition:background .12s}
.studio[data-layout="cols"] .splitter i{width:2px;height:32px}
.studio[data-layout="rows"] .splitter i{height:2px;width:32px}
.splitter:hover i,.splitter:focus-visible i,.splitter.drag i,.vgrip:hover i,.vgrip:focus-visible i,.vgrip.drag i{background:var(--accent)}
.vgrip{height:14px;cursor:row-resize;display:grid;place-items:center;touch-action:none;user-select:none;background:var(--surface-sunken);border:1px solid var(--line);border-top:0;border-radius:0 0 10px 10px}
.vgrip i{display:block;width:44px;height:3px;border-radius:2px;background:var(--accent-weak)}
body.dragging{user-select:none}
body.dragging .editor,body.dragging .pane-prev{pointer-events:none}

/* actions */
.actions{display:flex;flex-wrap:wrap;gap:8px;align-items:center;padding:14px 2px 0}
.grow{flex:1}
.btn{height:32px;padding:0 14px;border-radius:8px;border:1px solid var(--line-strong);background:transparent;font-size:13px;font-weight:500;cursor:pointer;color:var(--ink);white-space:nowrap;transition:background .15s var(--ease),border-color .15s var(--ease),color .15s var(--ease)}
.btn:hover{border-color:var(--ink-3)}
.btn-primary{background:var(--accent);border-color:var(--accent);color:var(--on-accent)}
.btn-primary:hover{background:var(--accent-hover);border-color:var(--accent-hover)}
.btn-text{border-color:transparent;color:var(--ink-2);font-weight:400;padding:0 8px}
.btn-text:hover{border-color:transparent;color:var(--ink)}
.tips{margin:10px 2px 0;font-size:12px;color:var(--ink-3);line-height:1.7}

/* rendered Markdown */
.md{padding:20px 28px 40px;max-width:860px;margin:0 auto;font-size:15px;line-height:1.85;overflow-wrap:anywhere}
.studio[data-view="preview"] .md{max-width:920px}
.md .empty{color:var(--ink-3)}
.md>:first-child{margin-top:0}
.md h1,.md h2,.md h3,.md h4,.md h5,.md h6{line-height:1.4;margin:1.7em 0 .6em;font-weight:700}
.md h1{font-size:1.7em;padding-bottom:.3em;border-bottom:1px solid var(--line)}
.md h2{font-size:1.4em;padding-bottom:.25em;border-bottom:1px solid var(--line)}
.md h3{font-size:1.2em}
.md h4{font-size:1.05em}
.md h5,.md h6{font-size:.95em;color:var(--ink-2)}
.md p,.md ul,.md ol,.md blockquote,.md pre,.md table,.md details{margin:0 0 1em}
.md ul,.md ol{padding-left:1.6em}
.md li+li{margin-top:.2em}
.md li>ul,.md li>ol{margin:.2em 0 0}
.md ul:has(>li>input[type="checkbox"]){list-style:none;padding-left:.4em}
.md li>input[type="checkbox"]{margin:0 .5em 0 0;accent-color:var(--accent);vertical-align:-.1em}
.md a{color:var(--accent);text-decoration:underline;text-underline-offset:.18em;text-decoration-thickness:1px}
.md a:hover{text-decoration-thickness:2px}
.md blockquote{border-left:3px solid var(--accent-weak);margin-left:0;padding:.1em 1em;color:var(--ink-2);background:var(--accent-soft);border-radius:0 6px 6px 0}
.md blockquote>:last-child{margin-bottom:0}
.md code{font-family:var(--mono);font-size:.92em;background:var(--code-bg);padding:.12em .4em;border-radius:5px}
.md pre{background:var(--code-bg);border:1px solid var(--line);border-radius:8px;padding:14px 16px;overflow:auto;line-height:1.65}
.md pre code{background:none;padding:0;font-size:13.5px;white-space:pre}
.md hr{border:0;border-top:1px solid var(--line-strong);margin:1.8em 0}
.md img{max-width:100%;height:auto;border-radius:6px}
.md table{border-collapse:collapse;display:block;max-width:100%;overflow:auto}
.md th,.md td{border:1px solid var(--line-strong);padding:6px 12px;text-align:left}
.md th{background:var(--surface-sunken);font-weight:600}
.md tbody tr:nth-child(even){background:color-mix(in srgb,var(--surface-sunken) 45%,transparent)}
.md del{color:var(--ink-3)}
/* syntax highlight (own tokens so it follows the theme) */
.hljs-keyword,.hljs-selector-tag,.hljs-literal,.hljs-section,.hljs-doctag,.hljs-type,.hljs-name,.hljs-built_in{color:var(--hl-4)}
.hljs-string,.hljs-regexp,.hljs-addition,.hljs-attribute,.hljs-meta .hljs-string{color:var(--hl-3)}
.hljs-number,.hljs-symbol,.hljs-bullet,.hljs-variable,.hljs-template-variable,.hljs-link{color:var(--hl-1)}
.hljs-title,.hljs-class .hljs-title,.hljs-function .hljs-title,.hljs-attr,.hljs-property,.hljs-selector-class,.hljs-selector-id{color:var(--hl-2)}
.hljs-comment,.hljs-quote,.hljs-meta,.hljs-deletion{color:var(--hl-c)}
.hljs-comment,.hljs-quote{font-style:italic}
.hljs-emphasis{font-style:italic}.hljs-strong{font-weight:700}

/* toast */
.toast{position:fixed;left:50%;bottom:calc(24px + env(safe-area-inset-bottom));transform:translateX(-50%);background:var(--ink);color:var(--bg);padding:8px 16px;border-radius:999px;font-size:13px;box-shadow:var(--pop);z-index:50;max-width:calc(100vw - 32px)}

@media (max-width:760px){
  .hdr{padding:14px 16px 4px}
  .privacy{padding:0 16px 8px}
  .privacy .long{display:none}
  .privacy .short{display:inline}
  main{padding:0 12px}
  .toolbar{overflow-x:auto;flex-wrap:nowrap;scrollbar-width:thin}
  .tgroup,.vr{flex-shrink:0}
  .studio{height:var(--studio-h,max(420px,calc(100dvh - 300px)))}
  .editor{padding:14px 14px;font-size:14px}
  .md{padding:16px 16px 32px}
  .stats{margin-left:0;width:100%}
  .tips{display:none}
}
@media (prefers-reduced-motion:reduce){*,*::before,*::after{transition:none!important}}
@media print{.hdr,.privacy,.toolbar,.viewbar,.splitter,.vgrip,.actions,.tips,.tz-foot,.pane-edit{display:none!important}.studio{display:block;height:auto;border:0}.pane-prev{overflow:visible;background:#fff}}

/* Tsuzura: shared footer link to the tool box (same block in every sister site) */
.tz-foot{display:flex;justify-content:center;padding:28px 16px calc(36px + env(safe-area-inset-bottom))}
.tz-link{display:inline-flex;align-items:center;gap:10px;padding:8px 18px 8px 10px;border:1px solid var(--line);border-radius:999px;background:var(--surface);color:var(--ink-2);text-decoration:none;font-size:12px;line-height:1.4;--tz-gap:var(--surface);transition:border-color .15s,color .15s}
.tz-link:hover{border-color:var(--line-strong);color:var(--ink)}
.tz-mark{width:24px;height:24px;color:#8E5532;flex-shrink:0}
.tz-name{font-size:14px;font-weight:500;letter-spacing:.12em;color:var(--ink)}
.tz-sub{color:var(--ink-3)}
:root[data-theme="dark"] .tz-mark{color:#C9A063}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]) .tz-mark{color:#C9A063}}