:root {
  --ink: #123039;
  --deep: #0c2027;
  --text: #1c3438;
  --muted: #5b7174;
  --paper: #ffffff;
  --wash: #f0fbf7;
  --aqua: #00aeb6;
  --green: #3fba65;
  --gold: #f4b63f;
  --coral: #f26d55;
  --blue: #227bc2;
  --line: #cfe6df;
  --line-strong: #9ed2c7;
  --panel: #ffffff;
  --shadow: 0 18px 42px rgba(18, 48, 57, 0.12);
  --radius: 8px;
  --max: 1180px;
  --heading: "Nunito Sans", "Avenir Next", Arial, sans-serif;
  --body: "Atkinson Hyperlegible", "Source Sans 3", Arial, sans-serif;
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  background: var(--paper);
}

body {
  margin: 0;
  color: var(--text);
  background:
    linear-gradient(180deg, rgba(0, 174, 182, 0.09), rgba(63, 186, 101, 0.02) 24rem, transparent 38rem),
    var(--paper);
  font-family: var(--body);
  font-size: 18px;
  line-height: 1.55;
}

img {
  display: block;
  max-width: 100%;
}

a { color: var(--blue); }

a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible,
select:focus-visible {
  outline: 3px solid var(--gold);
  outline-offset: 3px;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(255, 255, 255, 0.94);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(12px);
}

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

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  text-decoration: none;
  font: 900 1rem var(--heading);
  letter-spacing: 0;
}

.brand-mark {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background:
    radial-gradient(circle at 33% 28%, #ffffff 0 11%, transparent 12%),
    conic-gradient(from 15deg, var(--aqua), var(--green), var(--gold), var(--coral), var(--aqua));
  box-shadow: inset 0 0 0 2px rgba(18, 48, 57, 0.16);
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 4px;
}

.site-nav a {
  min-height: 42px;
  display: inline-flex;
  align-items: center;
  padding: 0 12px;
  border-radius: var(--radius);
  color: var(--muted);
  text-decoration: none;
  font: 800 0.9rem var(--heading);
}

.site-nav a:hover,
.site-nav a:focus,
.site-nav a[aria-current="page"] {
  color: var(--ink);
  background: var(--wash);
}

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 5px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--paper);
}

.nav-toggle span:not(.sr-only) {
  width: 20px;
  height: 2px;
  background: var(--ink);
}

.opening-panel {
  width: min(var(--max), calc(100% - 32px));
  min-height: calc(100vh - 72px);
  margin: 0 auto;
  padding: 54px 0 40px;
  display: grid;
  grid-template-columns: minmax(0, 1.02fr) minmax(300px, 0.78fr);
  gap: 40px;
  align-items: center;
}

.opening-copy h1,
.page-intro h1 {
  margin: 0;
  color: var(--ink);
  font-family: var(--heading);
  font-size: clamp(2.6rem, 6vw, 5.8rem);
  line-height: 0.98;
  letter-spacing: 0;
}

.lede {
  max-width: 760px;
  margin: 22px 0 0;
  color: var(--muted);
  font-size: 1.18rem;
}

.opening-visual {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--panel);
  box-shadow: var(--shadow);
}

.opening-visual img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.opening-visual figcaption {
  padding: 14px 16px;
  color: var(--muted);
  font: 800 0.88rem var(--heading);
}

.button-row,
.builder-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 26px;
}

.button {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 16px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: var(--panel);
  color: var(--ink);
  text-decoration: none;
  font: 900 0.92rem var(--heading);
  cursor: pointer;
}

.button.primary {
  border-color: var(--aqua);
  background: var(--aqua);
  color: #052226;
}

.button.secondary {
  background: var(--wash);
}

.button.quiet {
  color: var(--muted);
}

.button:hover {
  transform: translateY(-1px);
}

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

.page-band {
  padding: 60px 0;
  border-top: 1px solid var(--line);
}

.page-band.bright {
  width: 100%;
  max-width: none;
  padding: 60px max(16px, calc((100% - var(--max)) / 2));
  background: linear-gradient(135deg, rgba(0, 174, 182, 0.1), rgba(63, 186, 101, 0.12));
}

.section-head h2,
.preview-head h2 {
  margin: 0;
  color: var(--ink);
  font-family: var(--heading);
  font-size: clamp(1.7rem, 3vw, 2.6rem);
  line-height: 1.08;
  letter-spacing: 0;
}

.section-head p {
  max-width: 820px;
  margin: 12px 0 0;
  color: var(--muted);
}

.signal-grid,
.builder-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
  margin-top: 28px;
}

.reference-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
  margin-top: 28px;
}

.signal-card,
.builder-card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  box-shadow: 0 10px 26px rgba(18, 48, 57, 0.07);
}

.signal-card {
  padding: 20px;
}

.signal-card h3,
.builder-card h3 {
  margin: 12px 0 8px;
  color: var(--ink);
  font-family: var(--heading);
  font-size: 1.1rem;
  line-height: 1.18;
}

.signal-card p,
.builder-card p {
  margin: 0;
  color: var(--muted);
  font-size: 0.96rem;
}

.signal-mark {
  width: 36px;
  height: 8px;
  display: block;
  border-radius: 999px;
}

.signal-mark.aqua { background: var(--aqua); }
.signal-mark.green { background: var(--green); }
.signal-mark.gold { background: var(--gold); }
.signal-mark.coral { background: var(--coral); }

.evidence-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  margin-top: 26px;
}

.evidence-list p {
  margin: 0;
  padding: 18px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.82);
}

.evidence-intro {
  padding-bottom: 36px;
}

.evidence-meta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 20px;
}

.evidence-meta-row span {
  padding: 7px 10px;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  background: var(--wash);
  color: var(--muted);
  font: 900 0.78rem var(--heading);
}

.evidence-front .section-head {
  max-width: 980px;
}

.evidence-feature-grid,
.evidence-lane-grid,
.system-stat-grid,
.source-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  margin-top: 28px;
}

.evidence-card,
.evidence-lane,
.source-card {
  min-width: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.9);
  box-shadow: 0 10px 26px rgba(18, 48, 57, 0.07);
}

.evidence-card,
.source-card {
  padding: 20px;
}

.evidence-card.strong {
  border-color: var(--line-strong);
  background: #fbfffd;
}

.evidence-label {
  display: inline-flex;
  width: fit-content;
  margin-bottom: 10px;
  padding: 4px 8px;
  border-radius: 999px;
  background: var(--wash);
  color: var(--aqua);
  font: 900 0.74rem var(--heading);
  text-transform: uppercase;
}

.evidence-card h3,
.evidence-lane h3,
.source-card h3 {
  margin: 0 0 10px;
  color: var(--ink);
  font-family: var(--heading);
  font-size: 1.18rem;
  line-height: 1.18;
}

.evidence-card p,
.evidence-lane p,
.source-card p {
  margin: 0;
  color: var(--muted);
  font-size: 0.96rem;
}

.evidence-card a,
.evidence-lane a,
.source-card a {
  display: inline-block;
  margin-top: 14px;
  overflow-wrap: anywhere;
  font: 900 0.86rem var(--heading);
}

.evidence-lane {
  padding: 18px;
  border-left: 7px solid var(--aqua);
}

.evidence-lane:nth-child(2) {
  border-left-color: var(--green);
}

.evidence-lane:nth-child(3) {
  border-left-color: var(--gold);
}

.evidence-actions {
  margin-top: 24px;
}

.future-band {
  position: relative;
  width: 100%;
  padding: 76px max(16px, calc((100% - var(--max)) / 2));
  overflow: hidden;
  border-top: 1px solid rgba(255, 255, 255, 0.22);
  background:
    repeating-linear-gradient(135deg, rgba(255, 255, 255, 0.08) 0 1px, transparent 1px 24px),
    linear-gradient(130deg, #0b3339 0%, #11605b 58%, #f4b63f 100%);
  color: #f7fffb;
}

.future-inner {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(320px, 0.95fr);
  gap: clamp(28px, 5vw, 68px);
  align-items: center;
}

.future-copy h2 {
  max-width: 820px;
  margin: 0;
  color: #ffffff;
  font-family: var(--heading);
  font-size: clamp(2.15rem, 5vw, 4.8rem);
  line-height: 1;
  letter-spacing: 0;
}

.future-copy p {
  max-width: 780px;
  margin: 22px 0 0;
  color: rgba(247, 255, 251, 0.92);
  font-size: clamp(1.05rem, 1.6vw, 1.28rem);
}

.future-steps {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.future-steps div {
  min-width: 0;
  padding: 16px;
  border: 1px solid rgba(255, 255, 255, 0.22);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(10px);
}

.future-steps span {
  display: block;
  margin-bottom: 16px;
  color: #ffe7a3;
  font: 900 0.86rem var(--heading);
}

.future-steps strong {
  display: block;
  color: #ffffff;
  font: 900 1.08rem/1.18 var(--heading);
}

.future-steps p {
  margin: 8px 0 0;
  color: rgba(247, 255, 251, 0.84);
  font-size: 0.94rem;
  line-height: 1.45;
}

.future-actions {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 30px;
}

.future-actions .button.primary {
  border-color: #ffe7a3;
  background: #ffe7a3;
  color: #123039;
}

.future-actions .button.secondary {
  border-color: rgba(255, 255, 255, 0.6);
  background: rgba(255, 255, 255, 0.12);
  color: #ffffff;
}

.claim-table {
  display: grid;
  gap: 1px;
  margin-top: 28px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--line);
}

.claim-table > div {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
}

.claim-table strong,
.claim-table p {
  margin: 0;
  padding: 16px;
  background: var(--panel);
  overflow-wrap: anywhere;
}

.claim-table strong {
  color: var(--ink);
  font: 900 0.9rem var(--heading);
}

.claim-table p {
  color: var(--text);
  font-size: 0.94rem;
}

.source-private {
  margin-top: 14px !important;
  padding-top: 12px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font: 800 0.84rem var(--heading);
}

.system-stat {
  min-width: 0;
  padding: 18px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.88);
}

.system-stat strong {
  display: block;
  color: var(--ink);
  font: 900 1.7rem var(--heading);
  line-height: 1;
}

.system-stat span {
  display: block;
  margin-top: 10px;
  color: var(--muted);
  font-size: 0.94rem;
}

.system-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
}

.system-links a {
  display: inline-flex;
  min-height: 38px;
  align-items: center;
  padding: 0 12px;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  background: var(--panel);
  color: var(--ink);
  text-decoration: none;
  font: 900 0.82rem var(--heading);
}

.builder-card {
  display: flex;
  min-height: 210px;
  padding: 18px;
  flex-direction: column;
  color: inherit;
  text-decoration: none;
  transition: transform 160ms ease, border-color 160ms ease;
}

.builder-card:hover,
.builder-card:focus {
  transform: translateY(-2px);
  border-color: var(--aqua);
}

.builder-number {
  width: fit-content;
  padding: 4px 8px;
  border-radius: 999px;
  background: var(--wash);
  color: var(--aqua);
  font: 900 0.78rem var(--heading);
}

.builder-file {
  margin-top: auto;
  padding-top: 16px;
  color: var(--muted);
  font: 800 0.8rem var(--heading);
  overflow-wrap: anywhere;
}

.reference-card {
  min-width: 0;
  min-height: 180px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  color: inherit;
  text-decoration: none;
  box-shadow: 0 10px 26px rgba(18, 48, 57, 0.07);
}

.reference-card:hover,
.reference-card:focus {
  transform: translateY(-2px);
  border-color: var(--aqua);
}

.reference-card span {
  width: fit-content;
  padding: 4px 8px;
  border-radius: 999px;
  background: var(--wash);
  color: var(--aqua);
  font: 900 0.72rem var(--heading);
  text-transform: uppercase;
}

.reference-card strong {
  color: var(--ink);
  font: 900 1.05rem var(--heading);
  line-height: 1.18;
}

.reference-card p {
  margin: 0;
  color: var(--muted);
  font-size: 0.94rem;
}

.reference-band {
  width: 100%;
}

.page-intro {
  padding: 54px 0 24px;
}

.page-intro .step-label {
  margin: 0 0 12px;
  color: var(--aqua);
  font: 900 0.84rem var(--heading);
  text-transform: uppercase;
}

.builder-intro h1 {
  max-width: 900px;
  font-size: clamp(2.3rem, 5vw, 4.7rem);
}

.claim-boundary {
  max-width: 880px;
  margin: 18px 0 0;
  padding: 14px 16px;
  border-left: 5px solid var(--coral);
  border-radius: var(--radius);
  background: #fff6f2;
  color: var(--text);
}

.builder-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.08fr) minmax(420px, 0.92fr);
  gap: 28px;
  align-items: start;
  padding: 24px 0 36px;
}

.builder-form,
.preview-panel {
  min-width: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  box-shadow: 0 12px 28px rgba(18, 48, 57, 0.08);
}

.builder-form {
  padding: 20px;
}

.builder-form fieldset {
  margin: 0;
  padding: 20px 0;
  border: 0;
  border-top: 1px solid var(--line);
}

.builder-form fieldset:first-child {
  padding-top: 0;
  border-top: 0;
}

.builder-form legend {
  margin-bottom: 14px;
  color: var(--ink);
  font: 900 1.05rem var(--heading);
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 20px;
  align-items: start;
}

.field {
  min-width: 0;
  display: grid;
  gap: 8px;
  align-content: start;
  color: var(--muted);
  font: 900 0.9rem var(--heading);
}

.field-wide {
  grid-column: 1 / -1;
}

.field > span {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 10px;
  line-height: 1.2;
  overflow-wrap: anywhere;
}

.field-flag {
  display: inline-flex;
  padding: 2px 7px;
  border-radius: 999px;
  background: #fff1e8;
  color: #a1432c;
  font-size: 0.72rem;
}

input,
textarea,
select {
  width: 100%;
  max-width: 100%;
  min-width: 0;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: #fbfffd;
  color: var(--text);
  font: 700 0.98rem var(--body);
  line-height: 1.35;
}

input,
select {
  min-height: 50px;
  padding: 0 14px;
}

select {
  padding-right: 44px;
  text-overflow: ellipsis;
}

textarea {
  min-height: 116px;
  padding: 12px;
  resize: vertical;
  overflow-x: hidden;
}

.field-hints,
small {
  color: var(--muted);
  font: 700 0.82rem var(--body);
}

.field-hints {
  display: grid;
  gap: 4px;
  max-width: min(72ch, 100%);
  line-height: 1.3;
  overflow-wrap: anywhere;
  word-break: normal;
}

.field-hints span {
  display: block;
}

.field-wide .field-hints {
  max-width: min(96ch, 100%);
}

.field-hints strong {
  color: var(--ink);
  font-weight: 900;
}

.checkbox-group {
  margin: 0;
  padding: 0;
  border: 0;
}

.checkbox-group legend {
  margin: 0 0 8px;
  color: var(--muted);
  font: 900 0.9rem var(--heading);
}

.checkbox-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
}

.checkbox-grid label {
  min-height: 40px;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 10px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--wash);
  color: var(--text);
  font: 800 0.9rem var(--body);
}

.checkbox-grid input {
  width: auto;
  min-height: auto;
  accent-color: var(--aqua);
}

.status-line {
  margin: 14px 0 0;
  color: var(--muted);
  font: 800 0.9rem var(--heading);
}

.preview-panel {
  position: sticky;
  top: 92px;
  overflow: hidden;
}

.preview-head {
  padding: 16px;
  border-bottom: 1px solid var(--line);
  background: var(--wash);
}

.preview-head h2 {
  font-size: 1.25rem;
}

.preview-head span {
  display: block;
  color: var(--muted);
  font: 800 0.82rem var(--heading);
  overflow-wrap: anywhere;
}

[data-markdown-output] {
  width: 100%;
  min-height: 720px;
  border: 0;
  border-radius: 0;
  background: #10282f;
  color: #f5fffb;
  font: 500 0.9rem Consolas, "Cascadia Mono", monospace;
  line-height: 1.45;
  overflow-x: hidden;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}

.builder-pager {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  padding: 0 0 64px;
}

.pager-link {
  min-height: 64px;
  display: flex;
  align-items: center;
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  color: var(--ink);
  text-decoration: none;
  font: 900 0.95rem var(--heading);
}

.pager-link.next {
  justify-content: flex-end;
  text-align: right;
}

.site-footer {
  border-top: 1px solid var(--line);
  background: var(--deep);
  color: #dff7f1;
}

.footer-inner {
  width: min(var(--max), calc(100% - 32px));
  margin: 0 auto;
  padding: 28px 0;
  display: grid;
  gap: 8px;
}

.footer-inner p {
  margin: 0;
}

.top-button {
  position: fixed;
  right: 18px;
  bottom: 18px;
  z-index: 40;
  width: 48px;
  height: 48px;
  border: 1px solid var(--line-strong);
  border-radius: 50%;
  background: var(--ink);
  color: #ffffff;
  font: 900 1.35rem var(--heading);
  box-shadow: var(--shadow);
  cursor: pointer;
}

@media (max-width: 1040px) {
  .signal-grid,
  .builder-grid,
  .reference-grid,
  .evidence-feature-grid,
  .evidence-lane-grid,
  .system-stat-grid,
  .source-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .opening-panel,
  .builder-layout {
    grid-template-columns: 1fr;
  }

  .opening-panel {
    min-height: auto;
  }

  .preview-panel {
    position: static;
  }
}

@media (max-width: 820px) {
  .nav-toggle {
    display: inline-flex;
  }

  .site-nav {
    position: absolute;
    left: 16px;
    right: 16px;
    top: 72px;
    display: none;
    padding: 10px;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    background: var(--paper);
    box-shadow: var(--shadow);
  }

  .site-nav.is-open {
    display: grid;
  }

  .site-nav a {
    justify-content: flex-start;
  }

  .future-inner {
    grid-template-columns: 1fr;
  }

  .evidence-list,
  .form-grid,
  .checkbox-grid,
  .claim-table > div {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 620px) {
  body {
    font-size: 17px;
  }

  .opening-panel,
  .page-shell,
  .page-band,
  .footer-inner,
  .nav-shell {
    width: min(100% - 24px, var(--max));
  }

  .page-band.bright {
    padding-left: 12px;
    padding-right: 12px;
  }

  .future-band {
    padding: 54px 12px;
  }

  .future-steps {
    grid-template-columns: 1fr;
  }

  .future-actions .button {
    width: 100%;
  }

  .signal-grid,
  .builder-grid,
  .reference-grid,
  .evidence-feature-grid,
  .evidence-lane-grid,
  .system-stat-grid,
  .source-grid,
  .builder-pager {
    grid-template-columns: 1fr;
  }

  .opening-copy h1,
  .page-intro h1 {
    font-size: 2.5rem;
  }

  .builder-form,
  .preview-panel {
    border-radius: var(--radius);
  }

  .builder-actions .button {
    width: 100%;
  }
}