/* ============================================================
   Walden Docs — paper, ink & pine, in reading form.
   Shares the landing's palette; owns its own layout.
   ============================================================ */

:root {
  --paper:      #f2eee4;
  --paper-2:    #ece6d8;
  --paper-3:    #e4ddcc;
  --ink:        #181610;
  --ink-soft:   rgba(24, 22, 16, 0.66);
  --ink-mute:   rgba(24, 22, 16, 0.45);
  --rule:       rgba(24, 22, 16, 0.14);
  --rule-soft:  rgba(24, 22, 16, 0.08);
  --pine:       #2c4734;
  --pine-deep:  #1f3527;
  --pine-bright:#3b6049;

  --serif: "Fraunces", Georgia, "Times New Roman", serif;
  --mono:  "JetBrains Mono", ui-monospace, "SFMono-Regular", Menlo, monospace;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--serif);
  font-optical-sizing: auto;
  font-size: clamp(1rem, 0.4vw + 0.94rem, 1.1rem);
  line-height: 1.65;
  font-weight: 380;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

::selection { background: var(--pine); color: var(--paper); }

/* header ---------------------------------------------------------------- */
.site-head {
  display: flex; align-items: baseline; justify-content: space-between;
  gap: 1.5rem; flex-wrap: wrap;
  padding: 1.1rem clamp(1.2rem, 4vw, 3rem);
  border-bottom: 1px solid var(--rule);
}
.brand { display: flex; align-items: baseline; gap: 0.7rem; }
.wordmark {
  font-family: var(--serif); font-weight: 600; font-size: 1.15rem;
  color: var(--ink); text-decoration: none; letter-spacing: 0.01em;
}
.wordmark .mark { color: var(--pine); }
.version-tag {
  font-family: var(--mono); font-size: 0.66rem; letter-spacing: 0.12em;
  text-transform: uppercase; color: var(--pine);
  border: 1px solid var(--rule); border-radius: 999px;
  padding: 0.14rem 0.6rem; text-decoration: none;
}
.nav { display: flex; gap: 1.3rem; font-family: var(--mono); font-size: 0.78rem; }
.nav a { color: var(--ink-soft); text-decoration: none; }
.nav a:hover { color: var(--pine); }

/* layout ---------------------------------------------------------------- */
.layout {
  display: grid; grid-template-columns: 15.5rem minmax(0, 1fr);
  gap: clamp(1.5rem, 4vw, 4rem);
  max-width: 76rem; margin: 0 auto;
  padding: 2.2rem clamp(1.2rem, 4vw, 3rem) 4rem;
}

/* sidebar --------------------------------------------------------------- */
.sidebar {
  font-family: var(--mono); font-size: 0.78rem; line-height: 1.5;
  align-self: start; position: sticky; top: 1.4rem;
}
/* Desktop: the menu is a plain always-open panel — the summary control
   disappears, and with it the only way to collapse the details. */
.sidenav > summary { display: none; }
.sidebar .lane {
  margin: 1.3rem 0 0.45rem; font-size: 0.62rem; letter-spacing: 0.16em;
  text-transform: uppercase; color: var(--ink-mute);
}
.sidebar .lane:first-child { margin-top: 0; }
.sidebar ul { list-style: none; margin: 0; padding: 0; }
.sidebar li { margin: 0.28rem 0; }
.sidebar a {
  color: var(--ink-soft); text-decoration: none;
  border-left: 2px solid transparent; padding-left: 0.6rem; display: inline-block;
}
.sidebar a:hover { color: var(--pine); }
.sidebar a.here { color: var(--pine); border-left-color: var(--pine); font-weight: 500; }

/* Mobile: single column, static collapsible menu. This block must stay
   after the .sidebar base rules — equal specificity, source order wins. */
@media (max-width: 54rem) {
  .layout { grid-template-columns: 1fr; padding-top: 1.4rem; }
  .sidebar { position: static; }
  .sidenav {
    border: 1px solid var(--rule); border-radius: 8px;
    background: var(--paper-2); padding: 0.65rem 0.9rem; margin-bottom: 1.6rem;
  }
  .sidenav > summary {
    display: list-item; cursor: pointer;
    font-size: 0.7rem; letter-spacing: 0.14em; text-transform: uppercase;
    color: var(--pine); font-weight: 500;
  }
  .sidenav[open] > summary { margin-bottom: 0.8rem; }
}

/* article --------------------------------------------------------------- */
.doc { max-width: 46rem; min-width: 0; }
.doc h1 {
  font-size: clamp(1.7rem, 3.4vw, 2.2rem); font-weight: 600;
  line-height: 1.15; letter-spacing: -0.01em; margin: 0 0 1rem;
}
.doc h2 {
  font-size: 1.32rem; font-weight: 600; letter-spacing: -0.005em;
  margin: 2.4rem 0 0.7rem; padding-top: 1.2rem; border-top: 1px solid var(--rule-soft);
}
.doc h3 { font-size: 1.08rem; font-weight: 600; margin: 1.8rem 0 0.5rem; }
.doc h4 { font-size: 0.95rem; font-weight: 600; margin: 1.4rem 0 0.4rem; }
.doc h1 code, .doc h2 code, .doc h3 code, .doc h4 code { font-size: 0.85em; }
.doc p { margin: 0 0 1rem; }
.doc strong { color: var(--pine-deep); font-weight: 600; }
.doc a { color: var(--pine); text-decoration: underline; text-decoration-thickness: 1px; text-underline-offset: 2px; }
.doc a:hover { color: var(--pine-deep); }

.doc code {
  font-family: var(--mono); font-size: 0.82em;
  background: var(--paper-2); border: 1px solid var(--rule-soft);
  border-radius: 4px; padding: 0.08em 0.35em;
}
.doc pre {
  background: var(--pine-deep); color: #e9e5d8;
  border-radius: 8px; padding: 1rem 1.2rem; margin: 1.1rem 0 1.4rem;
  overflow-x: auto; font-size: 0.8rem; line-height: 1.7;
}
.doc pre code { background: none; border: none; padding: 0; color: inherit; font-size: inherit; }

.doc ul, .doc ol { margin: 0 0 1rem; padding-left: 1.4rem; }
.doc li { margin: 0.3rem 0; }
.doc li > ul, .doc li > ol { margin: 0.3rem 0 0.3rem; }

.doc blockquote {
  margin: 1.2rem 0; padding: 0.5rem 0 0.5rem 1.1rem;
  border-left: 3px solid var(--pine);
  font-style: italic; color: var(--ink-soft);
}
.doc blockquote p { margin: 0; }

.table-scroll { overflow-x: auto; margin: 1.1rem 0 1.4rem; }
.doc table { border-collapse: collapse; width: 100%; font-size: 0.92rem; }
.doc th {
  font-family: var(--mono); font-size: 0.64rem; letter-spacing: 0.12em;
  text-transform: uppercase; color: var(--ink-mute); text-align: left;
  padding: 0.4rem 0.9rem 0.4rem 0; border-bottom: 1px solid var(--rule);
}
.doc td {
  padding: 0.55rem 0.9rem 0.55rem 0; border-bottom: 1px solid var(--rule-soft);
  vertical-align: top;
}

/* footer ---------------------------------------------------------------- */
.foot {
  display: flex; justify-content: space-between; gap: 1rem; flex-wrap: wrap;
  max-width: 76rem; margin: 0 auto;
  padding: 1.2rem clamp(1.2rem, 4vw, 3rem) 2.5rem;
  border-top: 1px solid var(--rule);
  font-family: var(--mono); font-size: 0.68rem; letter-spacing: 0.06em;
  color: var(--ink-mute);
}
.foot a { color: var(--ink-soft); text-decoration: none; }
.foot a:hover { color: var(--pine); }