:root{
  --ink:#171b1e;
  --paper:#ffffff;
  --line:#d9dddc;
  --red:#ef593c;
  --canvas:#e8eae8;
  --control:#f8f9f8;
  --hover:#eef0ee;
  --muted:#6c757b;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--canvas);color:var(--ink);font-family:Arial,sans-serif;transition:background .2s ease,color .2s ease}
header{height:68px;display:flex;align-items:center;gap:18px;padding:0 28px;border-bottom:1px solid var(--line);background:var(--paper);position:sticky;top:0;z-index:5}
.brand{font-size:11px;font-weight:800;letter-spacing:.12em;color:var(--ink);text-decoration:none;white-space:nowrap}
.brand b{display:inline-grid;place-items:center;width:26px;height:26px;border-radius:50%;background:var(--red);color:#fff;font-size:15px;letter-spacing:0;margin-right:8px}
.edition{padding-left:18px;border-left:1px solid var(--line);font:10px monospace;color:var(--muted);letter-spacing:.08em}
.language-switch{display:flex;border:1px solid var(--line);border-radius:2px;overflow:hidden;background:var(--control);box-shadow:0 1px 1px #1010100a}
.language-switch button{min-width:38px;appearance:none;border:0;background:var(--control);color:var(--muted);padding:8px 10px;font:10px monospace;letter-spacing:.08em;cursor:pointer;transition:background .16s ease,color .16s ease}
.language-switch button+button{border-left:1px solid var(--line)}
.language-switch button.active{background:var(--red);color:#fff}
.theme-toggle{width:34px;height:34px;display:grid;place-items:center;margin-left:auto;padding:0;border:1px solid var(--line);border-radius:2px;background:var(--control);color:var(--ink);font-size:18px;line-height:1;cursor:pointer;transition:background .16s ease,border-color .16s ease,color .16s ease}
.theme-toggle:hover{border-color:var(--red);color:var(--red)}
.menu{display:none;background:none;border:0;color:var(--ink);font-size:21px}
.reader{display:grid;grid-template-columns:292px minmax(0,1fr);min-height:calc(100vh - 68px)}
aside{position:sticky;top:68px;height:calc(100vh - 68px);padding:32px 22px 20px;background:var(--paper);border-right:1px solid var(--line);display:flex;flex-direction:column}
aside p{margin:0 0 18px;font:10px monospace;font-weight:700;letter-spacing:.1em;color:var(--muted)}
nav{display:flex;flex-direction:column;gap:2px;overflow:auto}
.chapter-link{display:block;padding:10px 9px;border-left:2px solid transparent;text-decoration:none;color:var(--muted);font-size:12px;line-height:1.3;transition:background .16s ease,color .16s ease,border-color .16s ease}
.chapter-link b{display:block;margin-bottom:4px;font:10px monospace;color:var(--muted)}
.chapter-link:hover{color:var(--ink);background:var(--hover);border-left-color:var(--red)}
aside small{margin-top:auto;padding:17px 3px 0;border-top:1px solid var(--line);font:11px/1.5 Arial;color:var(--muted)}
main{padding:28px 32px;background:var(--canvas)}
.drive-document{display:block;width:100%;height:calc(100vh - 124px);border:0;background:#252525;box-shadow:0 14px 34px #0005}
body.dark{--ink:#f4f1ea;--paper:#171717;--line:#3b3b3b;--canvas:#262626;--control:#222;--hover:#2c2c2c;--muted:#aaa49b}
body.dark header{border-bottom-color:#303030}
body.dark .chapter-link:hover{color:#fff}
body.dark .theme-toggle{background:#ef593c;border-color:#ef593c;color:#fff}
@media(max-width:760px){
  header{height:58px;padding:0 15px;gap:10px}
  .edition{display:none}
  .menu{display:block;margin-left:0}
  .reader{display:block}
  .reader aside{display:none;position:fixed;z-index:4;top:58px;left:0;width:100%;height:calc(100vh - 58px);padding:25px}
  .reader aside.open{display:flex}
  main{padding:0}
  .drive-document{height:calc(100vh - 58px);box-shadow:none}
}