:root {
  --paper: #fcfbf8;
  --ink: #1c2128;
  --muted: #636b76;
  --rule: #e7e4dc;
  --accent: #b5402f;
  --accent-wash: #faf0ee;
  --code-bg: #f3f1eb;
  --side-w: 272px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } * { transition: none !important; } }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  font-size: 16px;
  line-height: 1.65;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
a:focus-visible, button:focus-visible, input:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

/* ---------- Sidebar ---------- */
.sidebar {
  position: fixed; top: 0; left: 0; bottom: 0;
  width: var(--side-w);
  border-right: 1px solid var(--rule);
  background: var(--paper);
  overflow-y: auto;
  z-index: 20;
}
.side-inner { padding: 24px 20px 48px; }

.brand {
  display: flex; align-items: baseline; gap: 8px;
  font-family: 'Sora', sans-serif; font-weight: 700; font-size: 18px;
  color: var(--ink); margin-bottom: 18px;
}
.brand:hover { text-decoration: none; }
.brand-mark { color: var(--accent); font-size: 22px; line-height: 1; }
.brand-sub { font-family: 'JetBrains Mono', monospace; font-size: 11px; font-weight: 500; color: var(--muted); letter-spacing: 0.08em; text-transform: uppercase; }

.search-wrap { position: relative; margin-bottom: 20px; }
#search {
  width: 100%; padding: 8px 10px;
  border: 1px solid var(--rule); border-radius: 6px;
  background: #fff; font: inherit; font-size: 14px; color: var(--ink);
}
.search-results {
  position: absolute; top: calc(100% + 4px); left: 0; right: 0;
  background: #fff; border: 1px solid var(--rule); border-radius: 8px;
  box-shadow: 0 8px 24px rgba(28, 33, 40, 0.1);
  max-height: 320px; overflow-y: auto; z-index: 30;
}
.search-results a { display: block; padding: 9px 12px; border-bottom: 1px solid var(--rule); color: var(--ink); font-size: 14px; }
.search-results a:last-child { border-bottom: 0; }
.search-results a:hover { background: var(--accent-wash); text-decoration: none; }
.search-results .sr-section { display: block; font-family: 'JetBrains Mono', monospace; font-size: 10px; color: var(--muted); letter-spacing: 0.06em; text-transform: uppercase; }
.search-results .sr-empty { padding: 10px 12px; color: var(--muted); font-size: 14px; }

.side-group { margin-bottom: 18px; }
.side-label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px; font-weight: 500; letter-spacing: 0.08em; text-transform: uppercase;
  color: var(--muted); margin-bottom: 6px;
}
.side-group a {
  display: block; padding: 4px 10px; margin-left: -10px;
  color: var(--ink); font-size: 14px; border-left: 2px solid transparent; border-radius: 0 4px 4px 0;
}
.side-group a:hover { background: var(--accent-wash); text-decoration: none; }
.side-group a.active { border-left-color: var(--accent); color: var(--accent); font-weight: 600; background: var(--accent-wash); }

.menu-btn { display: none; }

/* ---------- Content ---------- */
.content { margin-left: var(--side-w); padding: 48px 40px 64px; }
.art-layout { display: flex; justify-content: center; gap: 56px; }
article { max-width: 720px; min-width: 0; flex: 0 1 720px; }

.toc { width: 200px; flex: none; position: sticky; top: 48px; align-self: flex-start; font-size: 13px; }
.toc-label { font-family: 'JetBrains Mono', monospace; font-size: 11px; font-weight: 500; letter-spacing: 0.08em; text-transform: uppercase; color: var(--muted); margin-bottom: 8px; }
.toc a { display: block; color: var(--muted); padding: 3px 0 3px 12px; border-left: 1px solid var(--rule); }
.toc a:hover { color: var(--accent); text-decoration: none; border-left-color: var(--accent); }
@media (max-width: 1180px) { .toc { display: none; } }

/* Signature: the grader's margin line */
.art-head { border-left: 2px solid var(--accent); padding-left: 22px; margin-bottom: 36px; }
.eyebrow {
  font-family: 'JetBrains Mono', monospace; font-size: 12px; font-weight: 500;
  letter-spacing: 0.1em; text-transform: uppercase; color: var(--accent); margin-bottom: 8px;
}
h1 { font-family: 'Sora', sans-serif; font-weight: 700; font-size: 32px; line-height: 1.2; margin: 0 0 10px; letter-spacing: -0.01em; }
.lede { font-size: 17px; color: var(--muted); margin: 0; }

h2 { font-family: 'Sora', sans-serif; font-weight: 600; font-size: 21px; margin: 40px 0 12px; letter-spacing: -0.01em; }
h3 { font-family: 'Sora', sans-serif; font-weight: 600; font-size: 16px; margin: 28px 0 8px; }
p { margin: 0 0 16px; }
ul, ol { margin: 0 0 16px; padding-left: 24px; }
li { margin-bottom: 6px; }
li::marker { color: var(--accent); }
hr { border: 0; border-top: 1px solid var(--rule); margin: 32px 0; }
strong { font-weight: 600; }

blockquote {
  margin: 0 0 16px; padding: 12px 16px;
  background: var(--accent-wash); border-left: 2px solid var(--accent); border-radius: 0 6px 6px 0;
  font-size: 15px;
}
blockquote p:last-child { margin-bottom: 0; }

code {
  font-family: 'JetBrains Mono', monospace; font-size: 0.88em;
  background: var(--code-bg); padding: 1px 5px; border-radius: 4px;
}
pre { background: var(--code-bg); border: 1px solid var(--rule); border-radius: 8px; padding: 14px 16px; overflow-x: auto; margin: 0 0 16px; }
pre code { background: none; padding: 0; }

kbd {
  font-family: 'JetBrains Mono', monospace; font-size: 12px;
  background: #fff; border: 1px solid var(--rule); border-bottom-width: 2px;
  border-radius: 4px; padding: 1px 6px;
}

table { border-collapse: collapse; width: 100%; margin: 0 0 16px; font-size: 15px; }
th { text-align: left; font-family: 'JetBrains Mono', monospace; font-size: 12px; letter-spacing: 0.05em; text-transform: uppercase; color: var(--muted); font-weight: 500; }
th, td { border-bottom: 1px solid var(--rule); padding: 8px 12px 8px 0; vertical-align: top; }

.placeholder {
  border: 1px dashed var(--rule); border-radius: 8px;
  padding: 18px 16px; margin: 0 0 16px;
  color: var(--muted); font-size: 14px; background: #fff;
}
.ph-label {
  display: block; font-family: 'JetBrains Mono', monospace; font-size: 10px;
  letter-spacing: 0.08em; text-transform: uppercase; margin-bottom: 4px;
}
.placeholder.shot .ph-label { color: var(--muted); }
.placeholder.todo { border-color: var(--accent); background: var(--accent-wash); }
.placeholder.todo .ph-label { color: var(--accent); }

/* ---------- Home ---------- */
.card-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 16px; }
.home { max-width: 880px; margin: 0 auto; }
.card { border: 1px solid var(--rule); border-radius: 10px; padding: 20px 22px; background: #fff; }
.card h2 { margin: 0 0 10px; font-size: 16px; }
.card ul { list-style: none; padding: 0; margin: 0; }
.card li { margin-bottom: 5px; }
.card a { color: var(--ink); font-size: 14px; }
.card a:hover { color: var(--accent); }

/* ---------- Pager / footer ---------- */
.pager { display: flex; justify-content: space-between; gap: 16px; margin-top: 48px; border-top: 1px solid var(--rule); padding-top: 20px; }
.pg { display: block; max-width: 48%; color: var(--ink); font-weight: 600; font-size: 14px; }
.pg span { display: block; font-family: 'JetBrains Mono', monospace; font-size: 10px; letter-spacing: 0.08em; text-transform: uppercase; color: var(--muted); font-weight: 500; margin-bottom: 2px; }
.pg.next { text-align: right; }
.pg:hover { color: var(--accent); text-decoration: none; }

.foot { max-width: 720px; margin-top: 56px; padding-top: 18px; border-top: 1px solid var(--rule); font-size: 13px; color: var(--muted); }

/* ---------- Mobile ---------- */
@media (max-width: 860px) {
  .menu-btn {
    display: block; position: fixed; top: 12px; right: 12px; z-index: 40;
    font-family: 'JetBrains Mono', monospace; font-size: 12px;
    background: #fff; border: 1px solid var(--rule); border-radius: 6px; padding: 6px 12px; cursor: pointer;
  }
  .sidebar { transform: translateX(-100%); transition: transform 0.2s ease; width: min(86vw, 320px); box-shadow: 0 0 40px rgba(28,33,40,0.15); }
  .sidebar.open { transform: translateX(0); }
  .content { margin-left: 0; padding: 28px 20px 56px; }
  h1 { font-size: 26px; }
}

/* ---------- Scrolling polish ---------- */
h2 { scroll-margin-top: 28px; }

.sidebar { scrollbar-width: thin; scrollbar-color: var(--rule) transparent; }
.sidebar::-webkit-scrollbar { width: 6px; }
.sidebar::-webkit-scrollbar-thumb { background: var(--rule); border-radius: 3px; }
.sidebar::-webkit-scrollbar-thumb:hover { background: var(--muted); }

body::-webkit-scrollbar { width: 10px; }
body::-webkit-scrollbar-thumb { background: var(--rule); border-radius: 5px; }
body::-webkit-scrollbar-thumb:hover { background: var(--muted); }