:root {
  --ink: #211e1a;
  --paper: #f5f2ea;
  --surface: #ffffff;
  --muted: #7c766c;
  --line: #e4ded2;
  --line-strong: #d3ccbd;
  --accent: #bf4126;
  --accent-soft: #f6ddd3;
  --opt-ink: #9a6b12;
  --opt-soft: #f4e8c4;
  --radius: 10px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --ink: #e8e4dc;
    --paper: #1a1815;
    --surface: #23201c;
    --muted: #8a8278;
    --line: #2e2a24;
    --line-strong: #3a352d;
    --accent: #e0644a;
    --accent-soft: #3a2420;
    --opt-ink: #c49030;
    --opt-soft: #2e2510;
  }
}

*, *::before, *::after {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: "IBM Plex Sans", system-ui, sans-serif;
  line-height: 1.6;
}

a {
  color: var(--accent);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

/* ---- layout ---- */

.wrap {
  max-width: 760px;
  margin: 0 auto;
  padding: clamp(16px, 4vw, 40px);
}

/* ---- nav ---- */

.site-nav {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  color: var(--muted);
  margin-bottom: 40px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--line);
}

.site-nav a {
  color: var(--muted);
}

.site-nav a:hover {
  color: var(--ink);
  text-decoration: none;
}

.site-nav .sep {
  color: var(--line-strong);
}

/* ---- eyebrow + headings ---- */

.eyebrow {
  font-family: "IBM Plex Mono", monospace;
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
  font-weight: 600;
  margin: 0 0 10px;
}

h1 {
  font-family: "Space Grotesk", system-ui, sans-serif;
  font-weight: 700;
  font-size: clamp(26px, 5vw, 40px);
  line-height: 1.08;
  letter-spacing: -0.02em;
  margin: 0 0 12px;
  color: var(--ink);
}

h2 {
  font-family: "Space Grotesk", system-ui, sans-serif;
  font-weight: 600;
  font-size: clamp(17px, 2.5vw, 21px);
  line-height: 1.2;
  letter-spacing: -0.01em;
  margin: 36px 0 10px;
  color: var(--ink);
}

h3 {
  font-family: "IBM Plex Sans", system-ui, sans-serif;
  font-weight: 600;
  font-size: 15px;
  margin: 24px 0 6px;
  color: var(--ink);
}

p {
  margin: 0 0 16px;
  max-width: 68ch;
}

.lead {
  font-size: 17px;
  color: var(--muted);
  max-width: 60ch;
  margin-bottom: 32px;
}

.lead b {
  color: var(--ink);
  font-weight: 600;
}

/* ---- stat strip ---- */

.stats {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 28px 0;
}

.stat {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 14px 18px;
  flex: 1 1 120px;
}

.stat .num {
  font-family: "Space Grotesk", sans-serif;
  font-weight: 700;
  font-size: 28px;
  line-height: 1;
  letter-spacing: -0.01em;
}

.stat .lab {
  font-size: 12px;
  color: var(--muted);
  margin-top: 5px;
}

/* ---- cards ---- */

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 12px;
  margin: 24px 0;
}

.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px 20px;
  text-decoration: none;
  display: block;
  transition: border-color 0.15s;
}

.card:hover {
  border-color: var(--ink);
  text-decoration: none;
}

.card .card-title {
  font-family: "Space Grotesk", sans-serif;
  font-weight: 600;
  font-size: 15px;
  color: var(--ink);
  margin: 0 0 6px;
}

.card .card-desc {
  font-size: 13px;
  color: var(--muted);
  margin: 0;
  line-height: 1.5;
}

.card .card-tag {
  font-family: "IBM Plex Mono", monospace;
  font-size: 10px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  font-weight: 600;
  margin-bottom: 8px;
}

/* ---- note / callout ---- */

.note {
  background: var(--surface);
  border: 1px solid var(--line);
  border-left: 3px solid var(--opt-soft);
  border-radius: 8px;
  padding: 12px 16px;
  font-size: 13px;
  color: var(--muted);
  margin: 20px 0;
}

.note b {
  color: var(--ink);
  font-weight: 600;
}

/* ---- phase escalation ---- */

.stat.escalation {
  flex: 2 1 300px;
}

.esc-row {
  display: flex;
  align-items: flex-end;
  gap: 8px;
  margin-top: 10px;
}

.esc-step {
  flex: 1;
  text-align: center;
}

.esc-step .n {
  font-family: "Space Grotesk", sans-serif;
  font-weight: 700;
  font-size: 22px;
  line-height: 1;
  color: var(--ink);
}

.esc-step .l {
  font-size: 10.5px;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-top: 5px;
}

.esc-step .bar {
  height: 5px;
  border-radius: 3px;
  background: var(--accent);
  margin-top: 7px;
}

.esc-arrow {
  color: var(--line-strong);
  font-size: 14px;
  padding-bottom: 22px;
}

/* ---- group list ---- */

.group-list {
  display: flex;
  flex-direction: column;
  gap: 1px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  margin: 20px 0;
}

.group-row {
  display: grid;
  grid-template-columns: 28px 1fr auto;
  align-items: center;
  gap: 14px;
  background: var(--surface);
  padding: 14px 16px;
  border-bottom: 1px solid var(--line);
}

.group-row:last-child {
  border-bottom: none;
}

.g-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  display: block;
  flex-shrink: 0;
}

.g-body {
  min-width: 0;
}

.g-name {
  font-family: "IBM Plex Mono", monospace;
  font-size: 12.5px;
  font-weight: 600;
  color: var(--ink);
  display: block;
  margin-bottom: 2px;
}

.g-desc {
  font-size: 12.5px;
  color: var(--muted);
  margin: 0;
  max-width: none;
}

.g-count {
  font-family: "IBM Plex Mono", monospace;
  font-size: 11px;
  color: var(--muted);
  white-space: nowrap;
  flex-shrink: 0;
}

/* ---- field guidance pages ---- */

.field-entry {
  padding: 18px 0;
  border-top: 1px solid var(--line);
  scroll-margin-top: 24px;
}

.field-entry:first-child {
  border-top: none;
  padding-top: 4px;
}

.field-entry h3 {
  font-family: "IBM Plex Mono", monospace;
  font-size: 15px;
  font-weight: 600;
  margin: 4px 0 8px;
  color: var(--ink);
  letter-spacing: 0;
}

.field-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
  margin-bottom: 4px;
  align-items: center;
}

.field-num {
  font-family: "IBM Plex Mono", monospace;
  font-size: 10px;
  font-weight: 700;
  color: var(--muted);
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 4px;
  padding: 2px 7px;
  flex-shrink: 0;
}

.field-tag {
  font-family: "IBM Plex Mono", monospace;
  font-size: 10.5px;
  padding: 2px 7px;
  border-radius: 4px;
  background: var(--paper);
  border: 1px solid var(--line);
  color: var(--muted);
  white-space: nowrap;
}

.field-tag.ess {
  background: var(--accent-soft);
  border-color: transparent;
  color: var(--accent);
}

.field-tag.opt {
  background: var(--opt-soft);
  border-color: transparent;
  color: var(--opt-ink);
}

.section-group {
  margin-top: 32px;
}

.section-group:first-child {
  margin-top: 0;
}

.section-group-label {
  font-family: "IBM Plex Mono", monospace;
  font-size: 10.5px;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
  padding-bottom: 8px;
  border-bottom: 1px solid var(--line-strong);
  margin-bottom: 0;
}

/* guide link in field reference table */
.guide-link {
  color: inherit;
  text-decoration: none;
}

.guide-link:hover {
  color: var(--accent);
  text-decoration: none;
}

/* ---- annex tables ---- */

.table-wrap {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--surface);
  margin: 20px 0;
}

.annex-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13.5px;
}

.annex-table thead th {
  font-family: "IBM Plex Mono", monospace;
  font-size: 10.5px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
  text-align: left;
  padding: 10px 14px;
  border-bottom: 1px solid var(--line-strong);
  background: var(--surface);
  white-space: nowrap;
}

.annex-table tbody td {
  padding: 11px 14px;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
  line-height: 1.55;
}

.annex-table tbody tr:last-child td {
  border-bottom: none;
}

.annex-table tbody tr:hover td {
  background: var(--paper);
}

.annex-table .group-header td {
  font-family: "IBM Plex Mono", monospace;
  font-size: 10.5px;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink);
  padding: 9px 14px;
  background: var(--paper);
  border-bottom: 1px solid var(--line-strong);
  border-top: 1px solid var(--line-strong);
}

.annex-table .group-header:first-child td {
  border-top: none;
}

.annex-table td p {
  max-width: none;
  margin: 0 0 6px;
}

.annex-table td p:last-child {
  margin: 0;
}

.annex-table td ul {
  margin: 4px 0 0;
  padding-left: 18px;
}

.annex-table td li {
  margin-bottom: 2px;
}

/* ---- level badges (severity / impact scales) ---- */

.level-badge {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 5px;
  font-family: "IBM Plex Mono", monospace;
  font-size: 11.5px;
  font-weight: 600;
  white-space: nowrap;
}

.level-none { background: #ece9e1; color: #7c766c; }
.level-1    { background: #d4edda; color: #155724; }
.level-2    { background: #c8e6c9; color: #2e7d32; }
.level-3    { background: #fff9c4; color: #7c6c00; }
.level-4    { background: #ffe0b2; color: #7a3500; }
.level-5    { background: #ffcdd2; color: #7b1f26; }

.scale-transition {
  font-family: "IBM Plex Sans", system-ui, sans-serif;
  font-style: italic;
  font-size: 12px;
  color: var(--muted);
  padding: 5px 14px;
  background: var(--paper);
  border-bottom: 1px solid var(--line);
}

/* ---- footer ---- */

footer {
  margin-top: 48px;
  padding-top: 20px;
  border-top: 1px solid var(--line);
  font-size: 12px;
  color: var(--muted);
  line-height: 1.7;
}

footer a {
  color: var(--muted);
}

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