/* The Diagnostic Manual of AI-Associated Disorders (DM-AID)
   Warm cream / oxblood clinical reference. Spectral + IBM Plex Mono. No build step. */

:root {
  /* Surfaces */
  --paper:  #F4EFE3;  /* page background — warm cream */
  --panel:  #EDE6D6;  /* sidebar / inset panels — a half-step deeper beige */
  --tint:   #E3D8C4;  /* active-nav background tint */

  /* Ink */
  --ink:    #2B2622;  /* primary text — warm near-black brown */
  --muted:  #6F6557;  /* secondary / captions / codes */

  /* Lines */
  --rule:   #D8CFBE;  /* hairline borders & section rules */

  /* Accent — single, restrained oxblood */
  --accent:       #7A2E2E;
  --accent-hover: #5E2222;

  --font-serif: "Spectral", Georgia, "Times New Roman", serif;
  --font-mono:  "IBM Plex Mono", ui-monospace, "SF Mono", Menlo, monospace;

  --sidebar-w: 19rem;
  --measure: 64ch;
}

* { box-sizing: border-box; }

html { font-size: 17px; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-serif);
  font-weight: 400;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

/* ====================== UTILITY ====================== */

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  z-index: 100;
  background: var(--accent);
  color: var(--paper);
  padding: 0.6rem 1rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  text-decoration: none;
}
.skip-link:focus { left: 0.5rem; top: 0.5rem; }

.label {
  font-family: var(--font-mono);
  font-size: 0.66rem;
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--muted);
}

a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid var(--rule);
}
a:hover { color: var(--accent-hover); border-bottom-color: var(--accent); }

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 2px;
}

/* ====================== LAYOUT ====================== */

.layout {
  display: grid;
  grid-template-columns: var(--sidebar-w) 1fr;
  min-height: 100vh;
}

/* ====================== SIDEBAR ====================== */

.sidebar {
  background: var(--panel);
  border-right: 1px solid var(--rule);
}

.sidebar-inner {
  position: sticky;
  top: 0;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  padding: 1.7rem 1.3rem 1.4rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  color: var(--ink);
  border-bottom: 0;
  padding-bottom: 1.3rem;
  margin-bottom: 1.3rem;
  border-bottom: 1px solid var(--rule);
}
.brand:hover { color: var(--accent); }

.brand-mark { width: 30px; height: 30px; flex-shrink: 0; color: var(--accent); }

.brand-text { display: flex; flex-direction: column; line-height: 1.15; }
.brand-abbr {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 0.95rem;
  letter-spacing: 0.14em;
}
.brand-full {
  font-size: 0.74rem;
  font-style: italic;
  color: var(--muted);
  margin-top: 0.15rem;
}

/* mobile contents toggle — hidden on desktop */
.nav-toggle { display: none; }

.nav-heading {
  margin: 0 0 0.7rem;
  font-family: var(--font-mono);
  font-size: 0.62rem;
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--muted);
}

.nav-list { list-style: none; margin: 0; padding: 0; }
.nav-list li { margin: 0 0 0.2rem; }

.nav-item {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  padding: 0.5rem 0.6rem;
  border-radius: 5px;
  color: var(--ink);
  border-bottom: 0;
  line-height: 1.25;
}
.nav-item .nav-ico { width: 26px; height: 26px; flex-shrink: 0; color: var(--muted); }
.nav-item .nav-name { font-size: 0.86rem; }
.nav-item .nav-code {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.6rem;
  letter-spacing: 0.06em;
  color: var(--muted);
  margin-top: 0.1rem;
}
.nav-item:hover { background: rgba(43, 38, 34, 0.045); color: var(--ink); }
.nav-item:hover .nav-ico { color: var(--accent); }
.nav-item.active { background: var(--tint); color: var(--accent); }
.nav-item.active .nav-ico,
.nav-item.active .nav-code { color: var(--accent); }

.sidebar-foot { margin: auto 0 0; padding-top: 1.2rem; }

.version-badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.62rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
  border: 1px solid var(--rule);
  border-radius: 3px;
  padding: 3px 8px;
}

/* ====================== CONTENT ====================== */

.main-col { display: flex; flex-direction: column; min-width: 0; }
.content { flex: 1; padding: 3.4rem 3rem 4rem; }
.content:focus { outline: none; }
.view { max-width: var(--measure); margin: 0 auto; }

.site-foot { padding: 1.4rem 3rem 2.2rem; border-top: 1px solid var(--rule); }
.site-foot span {
  display: block;
  max-width: var(--measure);
  margin: 0 auto;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  color: var(--muted);
}

.kicker {
  margin: 0 0 1.1rem;
  font-family: var(--font-mono);
  font-size: 0.66rem;
  font-weight: 500;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--muted);
}

h1, h2, h3, h4 { font-weight: 600; line-height: 1.18; }

.entry-title {
  font-size: 2rem;
  letter-spacing: -0.01em;
  margin: 0 0 0.4rem;
}
.entry-abbr { color: var(--muted); font-weight: 400; }

.tagline {
  font-style: italic;
  font-size: 1.12rem;
  color: var(--muted);
  margin: 0.6rem 0 1.4rem;
  line-height: 1.5;
}

.code-chip {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  color: var(--accent);
  border: 1px solid var(--accent);
  border-radius: 3px;
  padding: 3px 9px;
  font-variant-numeric: tabular-nums;
  margin-right: 0.4rem;
  vertical-align: 2px;
}

.rule { height: 0; border: 0; border-top: 1px solid var(--rule); margin: 2rem 0; }

/* Section blocks */
.section { margin: 2rem 0; }
.section-head {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 0.9rem;
  padding-bottom: 0.4rem;
  border-bottom: 1px solid var(--rule);
}

.section p { margin: 0 0 1rem; }
.section p:last-child { margin-bottom: 0; }

/* ---- Diagnostic criteria: lettered hanging indent ---- */
.criteria { list-style: none; margin: 0; padding: 0; }
.criterion {
  display: grid;
  grid-template-columns: 1.6rem 1fr;
  gap: 0.3rem 0.7rem;
  margin-bottom: 1.05rem;
}
.crit-letter {
  font-family: var(--font-mono);
  font-weight: 500;
  color: var(--accent);
  padding-top: 0.05rem;
}
.crit-body > p { margin: 0; }
.crit-sub {
  margin: 0.55rem 0 0;
  padding-left: 1.3rem;
  list-style: decimal;
}
.crit-sub li { margin-bottom: 0.4rem; padding-left: 0.25rem; }
.crit-note {
  margin: 0.55rem 0 0;
  padding-left: 0.9rem;
  border-left: 2px solid var(--rule);
  font-size: 0.92rem;
  font-style: italic;
  color: var(--muted);
}
.crit-note::before { content: "Note: "; font-style: normal; }

/* ---- Differential diagnosis ---- */
.diff-list { list-style: none; margin: 0; padding: 0; }
.diff-item { margin-bottom: 0.85rem; padding-left: 0.9rem; border-left: 2px solid var(--rule); }
.diff-name { font-weight: 500; }
.diff-name::after { content: ". "; }
.diff-note { color: var(--ink); }

/* ====================== HOME / FRONT MATTER ====================== */

.home-title {
  font-size: 2.6rem;
  letter-spacing: -0.015em;
  line-height: 1.08;
  margin: 0 0 0.8rem;
}
.home-mark { width: 46px; height: 46px; color: var(--accent); margin-bottom: 1.1rem; display: block; }
.home-sub {
  font-style: italic;
  font-size: 1.18rem;
  color: var(--muted);
  margin: 0 0 1.6rem;
  line-height: 1.5;
  max-width: 52ch;
}
.home-intro { font-size: 1.05rem; margin: 0 0 1.4rem; }

/* disorder index cards on the landing view */
.index-grid { list-style: none; margin: 1.4rem 0 0; padding: 0; display: grid; gap: 0.9rem; }
.index-card {
  display: grid;
  grid-template-columns: 2.4rem 1fr;
  gap: 0.3rem 1rem;
  align-items: start;
  padding: 1.1rem 1.2rem;
  border: 1px solid var(--rule);
  border-radius: 6px;
  color: var(--ink);
  background: transparent;
}
.index-card:hover { background: var(--panel); border-color: var(--muted); color: var(--ink); }
.index-card .card-ico { grid-row: span 2; width: 34px; height: 34px; color: var(--accent); margin-top: 0.15rem; }
.index-card .card-code {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.08em;
  color: var(--muted);
  margin-bottom: 0.15rem;
}
.index-card .card-name { font-weight: 500; font-size: 1.05rem; }
.index-card .card-tag { grid-column: 2; font-size: 0.9rem; color: var(--muted); font-style: italic; margin-top: 0.2rem; }

/* not-found */
.notfound { text-align: left; }
.notfound h1 { font-size: 1.8rem; margin: 0 0 0.6rem; }

/* per-entry footer line */
.entry-foot {
  margin-top: 2.6rem;
  padding-top: 1.2rem;
  border-top: 1px solid var(--rule);
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.06em;
  color: var(--muted);
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

/* ====================== RESPONSIVE ====================== */

@media (max-width: 760px) {
  html { font-size: 16px; }
  .layout { grid-template-columns: 1fr; }
  .sidebar { border-right: 0; border-bottom: 1px solid var(--rule); position: sticky; top: 0; z-index: 30; }
  .sidebar-inner { min-height: 0; padding: 0.9rem 1.1rem; position: static; }
  .brand { padding-bottom: 0; margin-bottom: 0; border-bottom: 0; }

  .nav-toggle {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: transparent;
    border: 1px solid var(--rule);
    border-radius: 5px;
    color: var(--ink);
    font-family: var(--font-mono);
    font-size: 0.62rem;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    padding: 0.45rem 0.7rem;
    margin-top: 0.9rem;
    cursor: pointer;
    width: 100%;
    justify-content: space-between;
  }
  .nav-toggle-icon {
    width: 11px; height: 11px;
    border-right: 1.5px solid currentColor;
    border-bottom: 1.5px solid currentColor;
    transform: rotate(45deg);
    transition: transform 0.2s ease;
  }
  .nav-toggle[aria-expanded="true"] .nav-toggle-icon { transform: rotate(-135deg); }

  .nav-region { display: none; margin-top: 0.9rem; }
  .nav-region.open { display: block; }
  .sidebar-foot { padding-top: 0.9rem; }

  .content { padding: 2rem 1.3rem 3rem; }
  .site-foot { padding: 1.2rem 1.3rem 1.8rem; }
  .home-title { font-size: 2.1rem; }
  .entry-title { font-size: 1.7rem; }
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; }
}