:root {
  --fs: 17px;
  --paper-w: 760px;
  --bg: #faf7f2;
  --bg-elevated: #ffffff;
  --fg: #2a2420;
  --fg-dim: #6b6358;
  --accent: #8a5a3c;
  --border: #e4dcd0;
  --sidebar-bg: #f3ede3;
  --code-bg: #efe8da;
  --mark-bg: #ffe9a8;
}

html[data-theme="dark"] {
  --bg: #1c1a17;
  --bg-elevated: #242220;
  --fg: #e9e3d8;
  --fg-dim: #a79c8c;
  --accent: #d6a373;
  --border: #3a352e;
  --sidebar-bg: #221f1b;
  --code-bg: #2c2824;
  --mark-bg: #5c4a1e;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; height: 100%; }
body {
  background: var(--bg);
  color: var(--fg);
  font-family: "Apple SD Gothic Neo", "Noto Sans KR", system-ui, sans-serif;
  font-size: var(--fs);
  line-height: 1.75;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  overflow: hidden;
}

button, input { font: inherit; color: inherit; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.icon-btn, .btn, .wide-btn, .link-btn {
  border: 1px solid var(--border);
  background: var(--bg-elevated);
  color: var(--fg);
  border-radius: 8px;
  cursor: pointer;
  padding: 6px 10px;
}
.icon-btn svg { width: 18px; height: 18px; fill: none; stroke: currentColor; stroke-width: 1.6; }

.topbar {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 16px;
  border-bottom: 1px solid var(--border);
  background: var(--bg-elevated);
  flex: 0 0 auto;
  z-index: 20;
}
.topbar .mark svg { width: 26px; height: 26px; stroke: var(--accent); fill: none; stroke-width: 1.6; }
.titles { color: inherit; text-decoration: none; display: block; flex: 1 1 auto; min-width: 0; }
.titles:hover { text-decoration: none; opacity: 0.85; }
.titles h1, .titles p { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.titles h1 { font-size: 15px; margin: 0; }
.titles p { font-size: 12px; margin: 0; color: var(--fg-dim); }
.tools { margin-left: auto; display: flex; align-items: center; gap: 8px; flex: 0 0 auto; }
.only-narrow { display: none; }

.star { display: flex; align-items: center; }
.star-act {
  display: flex; align-items: center; gap: 6px;
  border: 1px solid var(--border); border-radius: 8px 0 0 8px;
  padding: 6px 10px; background: var(--bg-elevated); color: var(--fg);
}
.star-act svg { width: 15px; height: 15px; fill: none; stroke: currentColor; stroke-width: 1.6; }
.star-act:hover { background: var(--sidebar-bg); text-decoration: none; }
.star-n {
  border: 1px solid var(--border); border-left: none; border-radius: 0 8px 8px 0;
  padding: 6px 10px; background: var(--sidebar-bg); color: var(--fg-dim);
  font-size: 13px; font-weight: 600;
}
.star-n:hover { text-decoration: none; }

html[data-theme="dark"] .ic-sun { display: none; }
html[data-theme="light"] .ic-moon { display: none; }

.shell {
  display: grid;
  grid-template-columns: 280px 1fr;
  flex: 1 1 auto;
  min-height: 0;
}

#sidebar {
  background: var(--sidebar-bg);
  border-right: 1px solid var(--border);
  padding: 14px;
  overflow-y: auto;
  min-height: 0;
}
.side-search .field {
  display: flex; align-items: center; gap: 6px;
  border: 1px solid var(--border); border-radius: 8px;
  padding: 6px 8px; background: var(--bg-elevated);
}
.side-search .field svg { width: 15px; height: 15px; stroke: var(--fg-dim); fill: none; stroke-width: 1.6; flex: none; }
.side-search input { flex: 1; border: none; background: none; outline: none; }
.wide-btn { width: 100%; margin-top: 8px; text-align: left; }
.hint { font-size: 12px; color: var(--fg-dim); margin: 6px 2px; }

.toc .part-h {
  width: 100%; display: flex; align-items: center; gap: 6px;
  background: none; border: none; padding: 10px 2px 4px;
  font-weight: 600; font-size: 13px; color: var(--fg-dim);
  cursor: pointer;
}
.toc .caret { width: 12px; height: 12px; stroke: currentColor; fill: none; stroke-width: 2; transition: transform .15s; }
.toc .part[data-open="0"] .caret { transform: rotate(-90deg); }
.toc .part[data-open="0"] ul { display: none; }
.toc ul { list-style: none; margin: 0; padding: 0; }
.toc li a {
  display: flex; gap: 8px; padding: 6px 8px; border-radius: 6px; color: var(--fg);
  font-size: 14px;
}
.toc li a:hover { background: var(--bg-elevated); text-decoration: none; }
.toc li a.active { background: var(--accent); color: #fff; }
.toc li a.read .num { opacity: .5; }
.toc .num { color: var(--fg-dim); flex: none; min-width: 2.4em; }
.toc .t {
  display: -webkit-box; -webkit-box-orient: vertical; -webkit-line-clamp: 2;
  overflow: hidden; word-break: keep-all; line-height: 1.35;
}
.toc li.hidden, .toc .part.hidden { display: none; }
.toc mark { background: var(--mark-bg); color: inherit; }

main#main { position: relative; overflow-y: auto; min-height: 0; }
.progress { position: sticky; top: 0; height: 3px; background: transparent; z-index: 10; }
.progress i { display: block; height: 100%; width: 0; background: var(--accent); }
.paper { max-width: var(--paper-w); margin: 0 auto; padding: 36px 24px 80px; }

article.md h1 { font-size: 1.6em; margin-top: 0; }
article.md h2 { font-size: 1.3em; margin-top: 2em; border-bottom: 1px solid var(--border); padding-bottom: .3em; }
article.md h3 { font-size: 1.1em; margin-top: 1.6em; }
article.md p, article.md li { color: var(--fg); }
article.md blockquote {
  margin: 1.4em 0; padding: .6em 1em; border-left: 3px solid var(--accent);
  background: var(--sidebar-bg); border-radius: 0 8px 8px 0;
}
article.md code { background: var(--code-bg); padding: .1em .35em; border-radius: 4px; font-size: .92em; }
article.md pre { background: var(--code-bg); padding: 12px 14px; border-radius: 8px; overflow-x: auto; }
article.md pre code { background: none; padding: 0; }
article.md table { border-collapse: collapse; width: 100%; }
.table-wrap { overflow-x: auto; }
article.md th, article.md td { border: 1px solid var(--border); padding: 6px 10px; text-align: left; }
article.md img { max-width: 100%; border-radius: 6px; }
article.md p:has(> img:only-child) {
  text-align: center; margin: 1.6em 0 0.4em;
}
article.md p:has(> em:only-child) {
  text-align: center; color: var(--fg-dim); font-size: 0.92em;
  margin: 0 0 1.6em;
}
article.md input[type="checkbox"] { width: 16px; height: 16px; margin-right: 6px; vertical-align: -2px; }
article.md li.task-list-item { list-style: none; margin-left: -1.4em; }

.pager { display: flex; justify-content: space-between; gap: 12px; margin-top: 3em; padding-top: 1.4em; border-top: 1px solid var(--border); }
.pg { flex: 1; border: 1px solid var(--border); border-radius: 10px; padding: 10px 14px; }
.pg.next { text-align: right; }
.pg .dir { display: block; font-size: 12px; color: var(--fg-dim); }
.pg .t { display: block; font-size: 14px; margin-top: 2px; }

.totop { position: fixed; right: 20px; bottom: 20px; border-radius: 50%; width: 38px; height: 38px; }

.bottombar {
  display: flex; justify-content: space-between; gap: 12px;
  padding: 8px 16px; border-top: 1px solid var(--border);
  background: var(--bg-elevated); font-size: 12px; color: var(--fg-dim);
  flex: 0 0 auto;
}

.err { border: 1px solid var(--border); border-radius: 10px; padding: 16px; }
.loading { color: var(--fg-dim); }

#scrim { position: fixed; inset: 0; background: rgba(0,0,0,.4); z-index: 15; }

@media (max-width: 860px) {
  .shell { grid-template-columns: 1fr; }
  .only-narrow { display: inline-flex; }
  .titles p { display: none; }
  #sidebar {
    position: fixed; top: 0; bottom: 0; left: 0; width: 82vw; max-width: 320px;
    transform: translateX(-100%); transition: transform .2s; z-index: 16;
  }
  body.nav-open #sidebar { transform: translateX(0); }
  body:not(.nav-open) #scrim { display: none; }
  .bottombar .keys { display: none; }
  .star-act span { display: none; }

  .topbar { padding: 8px 12px; gap: 8px; }
  .icon-btn { min-width: 40px; min-height: 40px; padding: 6px; display: inline-flex; align-items: center; justify-content: center; }
  .paper { padding: 24px 16px 60px; }
  .pager { flex-direction: column; }
  .bottombar { padding-bottom: max(8px, env(safe-area-inset-bottom)); }
  .totop { bottom: max(20px, calc(env(safe-area-inset-bottom) + 12px)); }
}

@media (max-width: 480px) {
  .topbar { gap: 6px; }
  .topbar .mark { display: none; }
  #print-page { display: none; }
  .titles h1 { font-size: 14px; }
  .tools { gap: 4px; }
  article.md h1 { font-size: 1.4em; }
  article.md h2 { font-size: 1.2em; }
}

.snip { font-size: 13px; color: var(--fg-dim); margin: 2px 0 10px; }
.snip mark { background: var(--mark-bg); color: var(--fg); }

@media print {
  @page { size: A4; margin: 12mm; }
  body * { visibility: hidden; }
  .paper, .paper * { visibility: visible; }
  .paper {
    position: absolute; left: 0; top: 0; width: 100%; max-width: none;
    margin: 0; padding: 0; background: #fff; color: #000;
  }
  article.md p:has(> img:only-child),
  article.md p:has(> em:only-child) { text-align: left; }
  .pager, .totop, .progress { display: none !important; }
  article.md h1 { font-size: 16pt; }
  article.md h2 { font-size: 13pt; border-color: #999; }
  article.md table { width: 100%; border-collapse: collapse; }
  article.md th, article.md td {
    border: 0.6pt solid #999; padding: 6pt 8pt; vertical-align: top;
    font-size: 10.5pt; color: #000;
  }
  article.md blockquote { background: none; border-left-color: #999; }
  article.md img { max-width: 100%; }
}