:root {
  --forest: #1b3a2f;
  --forest-deep: #0f261e;
  --plaster: #f5f0e6;
  --plaster-warm: #ede4d3;
  --brass: #b08d57;
  --brass-light: #d4b483;
  --ink: #24211c;
  --ink-soft: #57534a;
  --line: #d8cdb8;
  --white: #fffdf9;
  --red: #9a3324;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', sans-serif;
  color: var(--ink);
  background: var(--plaster);
  line-height: 1.68;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3 {
  font-family: 'Spectral', serif;
  color: var(--forest-deep);
  line-height: 1.2;
}

a {
  color: inherit;
}

.mono {
  font-family: 'IBM Plex Mono', monospace;
  letter-spacing: 0.04em;
}

.wrap {
  max-width: 840px;
  margin: 0 auto;
  padding: 0 24px;
}

.wide {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 24px;
}

header {
  background: var(--forest-deep);
  padding: 18px 0;
}

header .wide {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  font-family: 'Spectral', serif;
  font-weight: 600;
  font-size: 1.15rem;
  color: var(--plaster);
  text-decoration: none;
}

.logo span {
  color: var(--brass-light);
}

header .phone {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.85rem;
  color: var(--brass-light);
  text-decoration: none;
  border: 1px solid rgba(212,180,131,0.4);
  padding: 8px 14px;
  border-radius: 3px;
}

header .phone:hover {
  background: rgba(212,180,131,0.1);
}

.crumb {
  max-width: 1080px;
  margin: 0 auto;
  padding: 14px 24px 0;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.72rem;
  color: var(--ink-soft);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.crumb a {
  color: var(--ink-soft);
  text-decoration: none;
  border-bottom: 1px solid var(--line);
}

.crumb a:hover {
  color: var(--forest);
}

/* Hero */

.hero {
  padding: 40px 0 8px;
}

.eyebrow {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--brass);
  display: block;
  margin-bottom: 14px;
}

h1 {
  font-size: clamp(2.1rem, 4.5vw, 3.1rem);
  font-weight: 600;
  margin-bottom: 16px;
  max-width: 17ch;
}

.dek {
  font-size: 1.12rem;
  color: var(--ink-soft);
  max-width: 62ch;
  margin-bottom: 8px;
}

/* Diagnostic router - signature element */

.diagnostic {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 3px;
  margin: 34px 0 44px;
  box-shadow: 0 2px 8px rgba(27,58,47,0.07);
  overflow: hidden;
}

.diagnostic-head {
  background: var(--forest-deep);
  padding: 18px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}

.diagnostic-head .tag {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--brass-light);
}

.diagnostic-head h2 {
  color: var(--plaster);
  font-size: 1.15rem;
  margin: 0;
  border: none;
  padding: 0;
}

.diagnostic-body {
  padding: 6px;
}

.diag-option {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 18px 20px;
  text-decoration: none;
  border-bottom: 1px solid var(--line);
  transition: background 0.15s ease;
}

.diag-option:last-child {
  border-bottom: none;
}

.diag-option:hover {
  background: var(--plaster-warm);
}

.diag-option .symptom {
  display: flex;
  align-items: baseline;
  gap: 14px;
}

.diag-option .num {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.78rem;
  color: var(--brass);
  flex-shrink: 0;
  width: 22px;
}

.diag-option .text {
  font-size: 1.02rem;
  color: var(--ink);
}

.diag-option .text strong {
  color: var(--forest-deep);
}

.diag-option .arrow {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.78rem;
  color: var(--forest);
  flex-shrink: 0;
  white-space: nowrap;
}

/* Content */

.content {
  padding: 8px 0 20px;
}

.content p {
  margin-bottom: 18px;
  font-size: 1.03rem;
}

.content h2 {
  font-size: 1.6rem;
  margin-top: 50px;
  margin-bottom: 18px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--forest);
  display: inline-block;
}

.content h3 {
  font-size: 1.14rem;
  margin-top: 24px;
  margin-bottom: 10px;
}

.content ul, .content ol {
  margin: 0 0 20px 22px;
}

.content li {
  margin-bottom: 9px;
  font-size: 1.01rem;
}

/* Problem grid */

.problem-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin: 22px 0 30px;
}

.problem-card {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 2px;
  padding: 20px 22px;
  text-decoration: none;
  transition: border-color 0.2s ease, transform 0.15s ease;
  display: flex;
  flex-direction: column;
}

.problem-card:hover {
  border-color: var(--brass);
  transform: translateY(-2px);
}

.problem-card .ptag {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.68rem;
  text-transform: uppercase;
  color: var(--brass);
  letter-spacing: 0.06em;
  margin-bottom: 8px;
}

.problem-card h3 {
  margin: 0 0 8px;
  font-size: 1.08rem;
}

.problem-card p {
  font-size: 0.94rem;
  color: var(--ink-soft);
  margin-bottom: 0;
  flex-grow: 1;
}

.problem-card .go {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.76rem;
  color: var(--forest);
  margin-top: 12px;
}

/* Severity table */

.severity-table {
  width: 100%;
  border-collapse: collapse;
  margin: 20px 0 28px;
  font-size: 0.94rem;
  background: var(--white);
  border: 1px solid var(--line);
}

.severity-table th {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  background: var(--forest-deep);
  color: var(--plaster);
  text-align: left;
  padding: 11px 14px;
}

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

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

.severity-table tr:nth-child(even) td {
  background: var(--plaster-warm);
}

.severity-table .flag {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.72rem;
  padding: 3px 9px;
  border-radius: 10px;
  display: inline-block;
}

.flag-watch {
  background: rgba(176,141,87,0.18);
  color: var(--brass);
}

.flag-call {
  background: rgba(154,51,36,0.12);
  color: var(--red);
}

.table-scroll {
  overflow-x: auto;
}

.callout {
  background: var(--plaster-warm);
  border-left: 3px solid var(--forest);
  padding: 16px 20px;
  margin: 24px 0;
  font-size: 0.98rem;
  border-radius: 0 2px 2px 0;
}

.callout strong {
  color: var(--forest-deep);
}

.callout.warn {
  border-left-color: var(--red);
}

/* Process steps */

.process-list {
  list-style: none;
  margin: 22px 0 30px;
  padding: 0;
  counter-reset: step;
}

.process-list li {
  display: flex;
  gap: 18px;
  padding: 16px 0;
  border-bottom: 1px dashed var(--line);
  counter-increment: step;
}

.process-list li:last-child {
  border-bottom: none;
}

.process-list li::before {
  content: counter(step, decimal-leading-zero);
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.85rem;
  color: var(--brass);
  flex-shrink: 0;
  width: 30px;
  padding-top: 2px;
}

.process-list .step-body h3 {
  margin: 0 0 4px;
  font-size: 1.02rem;
}

.process-list .step-body p {
  margin: 0;
  font-size: 0.96rem;
  color: var(--ink-soft);
}

.faq {
  padding: 20px 0 40px;
}

.faq-item {
  border-bottom: 1px solid var(--line);
}

.faq-item summary {
  font-family: 'Spectral', serif;
  font-weight: 600;
  font-size: 1.06rem;
  color: var(--forest-deep);
  padding: 18px 4px;
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
}

.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-item summary::after {
  content: '+';
  font-family: 'IBM Plex Mono', monospace;
  font-size: 1.3rem;
  color: var(--brass);
  flex-shrink: 0;
  transition: transform 0.2s ease;
}

.faq-item[open] summary::after {
  transform: rotate(45deg);
}

.faq-item p {
  padding: 0 4px 20px;
  color: var(--ink-soft);
  font-size: 0.98rem;
}

.cta-band {
  background: var(--forest-deep);
  margin-top: 20px;
  padding: 48px 0;
}

.cta-band .wrap {
  text-align: center;
}

.cta-band h2 {
  font-family: 'Spectral', serif;
  color: var(--plaster);
  font-size: 1.6rem;
  margin-bottom: 10px;
  border: none;
  padding: 0;
}

.cta-band p {
  color: rgba(245,240,230,0.75);
  margin-bottom: 22px;
  font-size: 1rem;
}

.cta-buttons {
  display: flex;
  gap: 14px;
  justify-content: center;
  flex-wrap: wrap;
}

.btn {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.85rem;
  text-decoration: none;
  padding: 13px 26px;
  border-radius: 3px;
  letter-spacing: 0.03em;
}

.btn-primary {
  background: var(--brass);
  color: var(--forest-deep);
  font-weight: 600;
}

.btn-primary:hover {
  background: var(--brass-light);
}

.btn-secondary {
  border: 1px solid rgba(212,180,131,0.5);
  color: var(--brass-light);
}

.btn-secondary:hover {
  background: rgba(212,180,131,0.08);
}

.related {
  padding: 40px 0 60px;
}

.related h2 {
  font-size: 1.2rem;
  margin-bottom: 18px;
  border: none;
  padding: 0;
}

.related-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 14px;
}

.related-card {
  background: var(--white);
  border: 1px solid var(--line);
  padding: 16px 18px;
  text-decoration: none;
  border-radius: 2px;
  transition: border-color 0.2s ease, transform 0.15s ease;
}

.related-card:hover {
  border-color: var(--brass);
  transform: translateY(-1px);
}

.related-card .tag {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.68rem;
  text-transform: uppercase;
  color: var(--brass);
  letter-spacing: 0.06em;
  display: block;
  margin-bottom: 6px;
}

.related-card .title {
  font-family: 'Spectral', serif;
  font-weight: 600;
  color: var(--forest-deep);
  font-size: 0.98rem;
}

footer {
  background: var(--forest-deep);
  padding: 30px 0;
  text-align: center;
}

footer p {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.75rem;
  color: rgba(245,240,230,0.55);
}

@media (max-width: 700px) {
  .problem-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 700px) {
  .related-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 700px) {
  header .phone {
    font-size: 0.75rem;
    padding: 7px 10px;
  }
}

@media (max-width: 700px) {
  .diag-option {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }
}

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