:root {
  --charcoal-ink: #171A1C;
  --diagnostic-slate: #33414A;
  --signal-blue: #2457D6;
  --paper-white: #FFFDF8;
  --field-note: #F6F3EA;
  --line-gray: #C8C0B3;
  --margin-gray: #6F6A61;
  --proof-green: #3F6B56;
  --max-width: 1120px;
  --rule: 1px solid var(--line-gray);
}

* {
  box-sizing: border-box;
}

html {
  color: var(--charcoal-ink);
  background: var(--paper-white);
  font-family: "IBM Plex Sans", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.55;
  text-rendering: optimizeLegibility;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--charcoal-ink);
  background:
    linear-gradient(90deg, rgba(200, 192, 179, 0.22) 1px, transparent 1px) 0 0 / 96px 96px,
    var(--paper-white);
}

a {
  color: var(--signal-blue);
  text-underline-offset: 0.16em;
}

a:hover {
  color: var(--diagnostic-slate);
}

a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible,
select:focus-visible {
  outline: 3px solid rgba(36, 87, 214, 0.35);
  outline-offset: 3px;
}

.site-header {
  border-bottom: var(--rule);
  background: rgba(255, 253, 248, 0.94);
}

.nav {
  width: min(100% - 32px, var(--max-width));
  margin: 0 auto;
  min-height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  font-weight: 650;
  color: var(--charcoal-ink);
  text-decoration: none;
  letter-spacing: 0;
}

.nav-links {
  display: flex;
  gap: 18px;
  align-items: center;
  flex-wrap: wrap;
  font-family: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.82rem;
}

.nav-links a {
  color: var(--diagnostic-slate);
  text-decoration: none;
}

.nav-links a:hover {
  color: var(--signal-blue);
}

.shell {
  width: min(100% - 32px, var(--max-width));
  margin: 0 auto;
  padding: 72px 0;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(280px, 0.65fr);
  gap: 56px;
  align-items: end;
  padding-bottom: 56px;
  border-bottom: 2px solid var(--charcoal-ink);
}

.hero.compact {
  grid-template-columns: minmax(0, 1fr);
  max-width: 860px;
}

.kicker,
.label,
.eyebrow {
  margin: 0 0 14px;
  font-family: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.78rem;
  line-height: 1.2;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--proof-green);
}

h1,
h2,
h3 {
  margin: 0;
  line-height: 1.08;
  letter-spacing: 0;
}

h1 {
  max-width: 880px;
  font-size: clamp(2.7rem, 7vw, 5.9rem);
  font-weight: 520;
}

h2 {
  font-size: clamp(1.55rem, 3vw, 2.25rem);
  font-weight: 560;
}

h3 {
  font-size: 1.08rem;
  font-weight: 650;
}

p {
  margin: 0;
}

.lede {
  max-width: 760px;
  margin-top: 24px;
  font-size: clamp(1.08rem, 2vw, 1.35rem);
  color: var(--diagnostic-slate);
}

.hero-note {
  padding: 18px;
  border-left: 3px solid var(--proof-green);
  background: var(--field-note);
  color: var(--diagnostic-slate);
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 11px 16px;
  border: 1px solid var(--charcoal-ink);
  background: var(--charcoal-ink);
  color: var(--paper-white);
  text-decoration: none;
  font-weight: 600;
}

.button.secondary {
  background: transparent;
  color: var(--charcoal-ink);
}

.button:hover {
  border-color: var(--signal-blue);
  background: var(--signal-blue);
  color: var(--paper-white);
}

.section {
  padding: 48px 0;
  border-bottom: var(--rule);
}

.section:last-child {
  border-bottom: 0;
}

.section-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 24px;
}

.grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.grid.three {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.card {
  border: var(--rule);
  border-radius: 6px;
  background: rgba(255, 253, 248, 0.86);
  padding: 20px;
}

.card p,
.section p,
li {
  color: var(--diagnostic-slate);
}

.card h3 + p {
  margin-top: 10px;
}

.list {
  display: grid;
  gap: 10px;
  padding: 0;
  margin: 0;
  list-style: none;
}

.list li {
  padding-left: 18px;
  position: relative;
}

.list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.76em;
  width: 7px;
  height: 1px;
  background: var(--margin-gray);
}

.numbered {
  counter-reset: steps;
  display: grid;
  gap: 12px;
  padding: 0;
  margin: 0;
  list-style: none;
}

.numbered li {
  counter-increment: steps;
  display: grid;
  grid-template-columns: 52px minmax(0, 1fr);
  gap: 16px;
  align-items: center;
  padding: 14px;
  border: var(--rule);
  background: rgba(246, 243, 234, 0.62);
}

.numbered li::before {
  content: counter(steps, decimal-leading-zero);
  font-family: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  color: var(--proof-green);
}

.note,
.warning {
  padding: 18px;
  border: var(--rule);
  background: var(--field-note);
  color: var(--diagnostic-slate);
}

.warning {
  border-color: #9D6C3A;
  background: #FBF1E5;
  color: var(--charcoal-ink);
}

.form {
  display: grid;
  gap: 18px;
  max-width: 860px;
}

.field {
  display: grid;
  gap: 7px;
}

label,
legend {
  font-weight: 650;
}

input,
textarea,
select {
  width: 100%;
  border: 1px solid var(--line-gray);
  border-radius: 4px;
  background: #fffefa;
  color: var(--charcoal-ink);
  font: inherit;
  padding: 11px 12px;
}

textarea {
  min-height: 118px;
  resize: vertical;
}

fieldset {
  margin: 0;
  padding: 16px;
  border: var(--rule);
}

.radio-row {
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
  margin-top: 10px;
}

.radio-row label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-weight: 500;
}

.radio-row input {
  width: auto;
}

.visually-hidden-field {
  position: absolute;
  left: -10000px;
  width: 1px;
  height: 1px;
  overflow: hidden;
}

.footer {
  border-top: var(--rule);
  padding: 28px 0;
  color: var(--margin-gray);
  font-family: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.82rem;
}

.footer-inner {
  width: min(100% - 32px, var(--max-width));
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  gap: 18px;
  flex-wrap: wrap;
}

@media (max-width: 820px) {
  .nav {
    align-items: flex-start;
    flex-direction: column;
    padding: 18px 0;
  }

  .hero,
  .grid,
  .grid.three {
    grid-template-columns: 1fr;
  }

  .shell {
    padding: 48px 0;
  }

  h1 {
    font-size: clamp(2.45rem, 14vw, 4.4rem);
  }
}