/* ============================================================
   GMC Standard Operating Procedures — documentation site
   Design: ledger/charter aesthetic. Ink sidebar, paper canvas,
   gold thread for obligation language (SHALL / MUST / MAY),
   monospace for numbers, addresses, thresholds and dates.
   ============================================================ */

:root {
  --ink:        #14181D;
  --ink-soft:   #1F262E;
  --ink-line:   #2B333C;
  --paper:      #F6F5F1;
  --paper-dim:  #ECEAE3;
  --paper-line: #DEDBD1;
  --text:       #22201B;
  --text-dim:   #6B6A63;
  --gold:       #B0733E;
  --gold-soft:  #E7CDB4;
  --red:        #8A3B2E;
  --sidebar-w:  308px;

  --serif: "Source Serif 4", "Iowan Old Style", "Palatino Linotype", Georgia, serif;
  --sans: "Inter", "Helvetica Neue", Arial, sans-serif;
  --mono: "JetBrains Mono", "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--text);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }

/* ---------- Skip link / focus ---------- */
:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 2px;
}
.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--ink);
  color: var(--paper);
  padding: 8px 14px;
  z-index: 200;
}
.skip-link:focus { left: 8px; top: 8px; }

/* ================= LAYOUT SHELL ================= */
.shell {
  display: grid;
  grid-template-columns: var(--sidebar-w) 1fr;
  min-height: 100vh;
}

/* ================= SIDEBAR ================= */
.sidebar-scrim { display: none; }

.sidebar {
  background: var(--ink);
  color: #C9CDD2;
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
  padding: 28px 0 40px;
  border-right: 1px solid var(--ink-line);
}

.brand {
  padding: 0 24px 20px;
  border-bottom: 1px solid var(--ink-line);
  margin-bottom: 18px;
}
.brand .mark {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--gold-soft);
}
.brand .mark svg { flex-shrink: 0; }
.brand .mark img { flex-shrink: 0; width: 20px; height: 20px; object-fit: contain; border-radius: 4px; }
.brand-title {
  font-family: var(--serif);
  font-size: 19px;
  color: #F1EFE9;
  margin: 12px 0 4px;
  line-height: 1.25;
}
.brand-sub {
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: .06em;
  color: #8B9198;
  text-transform: uppercase;
}

.search-wrap {
  padding: 0 20px 16px;
  border-bottom: 1px solid var(--ink-line);
  margin-bottom: 10px;
}
.search-box {
  position: relative;
}
.search-box input {
  width: 100%;
  background: var(--ink-soft);
  border: 1px solid var(--ink-line);
  color: #E7E5DE;
  font-family: var(--sans);
  font-size: 13.5px;
  padding: 9px 12px 9px 32px;
  border-radius: 6px;
}
.search-box input::placeholder { color: #6E7681; }
.search-box svg {
  position: absolute;
  left: 10px;
  top: 50%;
  transform: translateY(-50%);
  color: #6E7681;
}
.search-count {
  font-family: var(--mono);
  font-size: 11px;
  color: #6E7681;
  margin-top: 6px;
  padding-left: 2px;
  min-height: 14px;
}

.nav {
  list-style: none;
  margin: 0;
  padding: 4px 12px 0;
}
.navitem { margin-bottom: 1px; }
.navlink {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 8px 12px;
  border-radius: 6px;
  font-size: 13.6px;
  color: #ABB0B6;
  transition: background .12s ease, color .12s ease;
}
.navlink:hover { background: var(--ink-soft); color: #F1EFE9; }
.navnum {
  font-family: var(--mono);
  font-size: 11px;
  color: #656C74;
  flex-shrink: 0;
  padding-top: 1px;
}
.navlink.active { background: var(--ink-soft); color: #F1EFE9; }
.navlink.active .navnum { color: var(--gold); }
.navitem.active > .navlink { border-left: 2px solid var(--gold); padding-left: 10px; }

.subnav {
  list-style: none;
  margin: 2px 0 8px;
  padding: 0 0 0 30px;
  border-left: 1px solid var(--ink-line);
  margin-left: 18px;
}
.subnav li a {
  display: block;
  padding: 5px 10px;
  font-size: 12.6px;
  color: #7B818A;
  border-radius: 5px;
}
.subnav li a:hover { color: #E7E5DE; background: var(--ink-soft); }
.subnav li a.active { color: var(--gold-soft); }

.sidebar-foot {
  padding: 18px 24px 0;
  margin-top: 14px;
  border-top: 1px solid var(--ink-line);
  font-family: var(--mono);
  font-size: 11px;
  color: #565C63;
  line-height: 1.7;
}

/* mobile toggle */
.menu-toggle {
  display: none;
}

/* ================= MAIN ================= */
.main {
  min-width: 0;
  position: relative;
}

.topbar {
  display: none;
}

.doc-header {
  max-width: 760px;
  margin: 0 auto;
  padding: 72px 40px 40px;
  border-bottom: 1px solid var(--paper-line);
}
.doc-eyebrow {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 14px;
}
.doc-title {
  font-family: var(--serif);
  font-size: 42px;
  line-height: 1.15;
  margin: 0 0 16px;
  color: var(--ink);
}
.doc-lede {
  font-size: 16.5px;
  color: var(--text-dim);
  max-width: 620px;
  margin: 0 0 22px;
}
.doc-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 22px;
  font-family: var(--mono);
  font-size: 12px;
  color: var(--text-dim);
}
.doc-meta strong { color: var(--text); font-weight: 600; }

.doc-body {
  max-width: 760px;
  margin: 0 auto;
  padding: 8px 40px 120px;
}

/* ---------- section blocks ---------- */
.doc-section {
  padding-top: 56px;
  border-top: 1px solid var(--paper-line);
  scroll-margin-top: 24px;
}
.doc-section:first-of-type { border-top: none; }

.section-head {
  display: flex;
  align-items: baseline;
  gap: 16px;
  margin-bottom: 22px;
}
.section-num {
  font-family: var(--mono);
  font-size: 14px;
  color: var(--gold);
  border: 1px solid var(--gold-soft);
  background: #FBF6EA;
  padding: 2px 8px;
  border-radius: 4px;
  flex-shrink: 0;
  transform: translateY(-2px);
}
.section-head h1 {
  font-family: var(--serif);
  font-size: 27px;
  margin: 0;
  color: var(--ink);
  scroll-margin-top: 24px;
}

.section-body h2 {
  font-family: var(--serif);
  font-size: 20px;
  color: var(--ink);
  margin: 34px 0 12px;
  scroll-margin-top: 24px;
}
.section-body h3 {
  font-family: var(--sans);
  font-weight: 700;
  font-size: 14.5px;
  letter-spacing: .01em;
  color: var(--ink);
  margin: 26px 0 10px;
  scroll-margin-top: 24px;
}
.section-body h4 {
  font-family: var(--mono);
  font-size: 12.5px;
  text-transform: uppercase;
  letter-spacing: .05em;
  color: var(--text-dim);
  margin: 20px 0 8px;
}

.section-body p { margin: 0 0 14px; }
.section-body ul, .section-body ol {
  margin: 0 0 16px;
  padding-left: 22px;
}
.section-body li { margin-bottom: 9px; }
.section-body li > ul, .section-body li > ol { margin-top: 9px; }
.section-body strong { color: var(--ink); font-weight: 700; }
.section-body em { color: var(--text); }

.section-body a {
  color: var(--red);
  border-bottom: 1px solid rgba(138,59,46,.35);
}
.section-body a:hover { border-bottom-color: var(--red); }

/* obligation-language markers (RFC-2119 style) */
.ob-strong, .ob-neg, .ob-mild {
  font-family: var(--mono);
  font-size: .82em;
  font-weight: 700;
  letter-spacing: .02em;
  padding: 1px 5px;
  border-radius: 3px;
  white-space: nowrap;
}
.ob-strong { color: #7A4516; background: #FBE7D6; }
.ob-neg    { color: #8A3B2E; background: #F7E3DD; }
.ob-mild   { color: #4B6353; background: #E4EEE6; }

/* mark highlight from source doc */
.section-body mark { background: #FCE1C7; color: inherit; padding: 0 3px; }

.doc-footer {
  max-width: 760px;
  margin: 0 auto;
  padding: 30px 40px 90px;
  font-size: 12.5px;
  color: var(--text-dim);
  border-top: 1px solid var(--paper-line);
}

/* search highlight in content */
.search-hit { background: var(--gold-soft); border-radius: 2px; }

.no-results {
  padding: 60px 20px;
  text-align: center;
  color: var(--text-dim);
  font-family: var(--mono);
  font-size: 13px;
  display: none;
}

.back-to-top {
  position: fixed;
  right: 28px;
  bottom: 28px;
  background: var(--ink);
  color: var(--paper);
  border-radius: 999px;
  width: 42px;
  height: 42px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 6px 18px rgba(0,0,0,.22);
  opacity: 0;
  transform: translateY(8px);
  transition: opacity .18s ease, transform .18s ease;
  pointer-events: none;
}
.back-to-top.show { opacity: 1; transform: translateY(0); pointer-events: auto; }

/* ================= RESPONSIVE ================= */
@media (max-width: 980px) {
  .shell { grid-template-columns: 1fr; }
  .sidebar {
    position: fixed;
    left: 0; top: 0;
    width: 300px;
    height: 100vh;
    transform: translateX(-100%);
    transition: transform .22s ease;
    z-index: 100;
    box-shadow: 8px 0 30px rgba(0,0,0,.25);
  }
  .sidebar.open { transform: translateX(0); }
  .sidebar-scrim {
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,.4);
    z-index: 90;
  }
  .sidebar-scrim.show { display: block; }

  .topbar {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 14px 18px;
    border-bottom: 1px solid var(--paper-line);
    background: var(--paper);
    position: sticky;
    top: 0;
    z-index: 80;
  }
  .menu-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: 7px;
    background: var(--ink);
    color: var(--paper);
    border: none;
    flex-shrink: 0;
  }
  .topbar-title {
    font-family: var(--serif);
    font-size: 15px;
    color: var(--ink);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
  }

  .doc-header { padding: 30px 22px 30px; }
  .doc-title { font-size: 30px; }
  .doc-body { padding: 8px 22px 100px; }
  .doc-footer { padding: 24px 22px 70px; }
}

@media (max-width: 560px) {
  .doc-meta { gap: 12px 18px; }
  .section-head { gap: 10px; }
  .section-head h1 { font-size: 23px; }
}

/* print */
@media print {
  .sidebar, .topbar, .back-to-top { display: none !important; }
  .shell { grid-template-columns: 1fr; }
}

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