:root {
  --bg: #f4efe7;
  --panel: rgba(255, 255, 255, 0.9);
  --panel-border: rgba(0, 0, 0, 0.78);
  --text: #111111;
  --muted: #444444;
  --accent: #0f766e;
  --accent-soft: rgba(15, 118, 110, 0.12);
  --line: #1c1714;
  --warning: #a16207;
  --danger: #b42318;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Avenir Next", "Segoe UI", "Helvetica Neue", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(15, 118, 110, 0.14), transparent 32%),
    radial-gradient(circle at top right, rgba(180, 83, 9, 0.12), transparent 28%),
    linear-gradient(180deg, #fcfaf6 0%, var(--bg) 100%);
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(rgba(28, 23, 20, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(28, 23, 20, 0.03) 1px, transparent 1px);
  background-size: 28px 28px;
  pointer-events: none;
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.7), transparent 92%);
}

.shell {
  width: min(1200px, calc(100vw - 32px));
  margin: 0 auto;
  padding: 40px 0 56px;
  position: relative;
}

.hero,
.layout {
  position: relative;
  z-index: 1;
}

.hero {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  align-items: end;
  margin-bottom: 24px;
}

h1,
h2 {
  font-family: "Arial Narrow", "Avenir Next Condensed", "Segoe UI", sans-serif;
  margin: 0;
}

h1 {
  font-size: clamp(2.2rem, 4vw, 4.4rem);
  line-height: 0.94;
  max-width: 12ch;
}

.lead,
.section-heading p,
.status,
.summary dd,
.field small {
  color: var(--muted);
}

.ghost-button {
  border: 1px solid var(--panel-border);
  background: rgba(255, 255, 255, 0.9);
  color: var(--text);
  border-radius: 0;
  padding: 12px 18px;
  font: inherit;
  cursor: pointer;
}

.layout {
  display: grid;
  grid-template-columns: minmax(320px, 420px) minmax(420px, 1fr);
  gap: 24px;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: 0;
  padding: 24px;
}

.section-heading {
  margin-bottom: 14px;
}

.section-heading h2 {
  font-size: 1.35rem;
  margin-bottom: 6px;
}

.section-heading p,
.field small,
.toggle small,
.lead {
  display: none;
}

.field-grid {
  display: grid;
  gap: 14px;
}

.field {
  display: grid;
  gap: 6px;
}

.field-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.toggle {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 4px 12px;
  align-items: center;
  padding: 14px 16px;
  border-radius: 0;
  background: rgba(255, 255, 255, 0.96);
  border: 1px solid rgba(0, 0, 0, 0.78);
}

.toggle input {
  width: 18px;
  height: 18px;
  margin: 0;
  accent-color: var(--accent);
}

.toggle span {
  font-weight: 600;
}

.field span {
  font-weight: 600;
}

.field-clear {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  padding: 0;
  border: 1px solid rgba(0, 0, 0, 0.32);
  background: rgba(255, 255, 255, 0.96);
  color: var(--muted);
  font: inherit;
  font-size: 1rem;
  line-height: 1;
  cursor: pointer;
}

.field-clear[hidden] {
  display: none;
}

.field input {
  width: 100%;
  padding: 14px 16px;
  border-radius: 0;
  border: 1px solid rgba(0, 0, 0, 0.78);
  background: rgba(255, 255, 255, 0.98);
  font: inherit;
  color: var(--text);
}

.field input:focus {
  outline: 2px solid rgba(15, 118, 110, 0.24);
  border-color: rgba(15, 118, 110, 0.34);
}

.field input[data-state="derived"] {
  background: rgba(255, 255, 255, 0.98);
}

.field input[data-state="invalid"] {
  border-color: rgba(180, 35, 24, 0.4);
  background: rgba(180, 35, 24, 0.05);
}

.field input[data-state="resolved"] {
  border-color: rgba(0, 0, 0, 0.18);
  background: rgba(0, 0, 0, 0.04);
  color: rgba(17, 17, 17, 0.58);
}

.field input[data-state="warning"] {
  border-color: rgba(161, 98, 7, 0.4);
  background: rgba(161, 98, 7, 0.08);
}

.status {
  min-height: 24px;
  margin-top: 18px;
  font-size: 0.95rem;
}

.status[data-tone="warning"] {
  color: var(--warning);
}

.status[data-tone="danger"] {
  color: var(--danger);
}

.diagram-panel {
  display: grid;
  gap: 18px;
}

.diagram-frame {
  border-radius: 0;
  padding: 16px;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.72), rgba(255, 255, 255, 0.9)),
    var(--accent-soft);
  border: 1px solid rgba(0, 0, 0, 0.78);
}

#diagram {
  width: 100%;
  height: auto;
  display: block;
}

.summary {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
  gap: 14px 20px;
  margin: 0;
}

.summary-item {
  padding: 12px 14px;
  border-radius: 0;
  background: rgba(255, 255, 255, 0.92);
  border: 1px solid rgba(0, 0, 0, 0.78);
}

.summary-item[data-state="derived"] {
  background: rgba(15, 118, 110, 0.08);
}

.summary-item[data-state="invalid"] {
  background: rgba(180, 35, 24, 0.08);
  border-color: rgba(180, 35, 24, 0.22);
}

.summary-item[data-state="warning"] {
  background: rgba(161, 98, 7, 0.08);
  border-color: rgba(161, 98, 7, 0.22);
}

.summary dt {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
  margin-bottom: 4px;
}

.summary dd {
  margin: 0;
  font-weight: 600;
  font-size: 1rem;
  color: var(--text);
}

.summary-badge {
  display: inline-flex;
  margin-top: 8px;
  padding: 4px 8px;
  border-radius: 0;
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  background: rgba(28, 23, 20, 0.08);
  color: var(--muted);
}

.summary-fix {
  display: inline-flex;
  margin-top: 10px;
  align-items: center;
  justify-content: center;
  padding: 9px 12px;
  border-radius: 0;
  border: 1px solid rgba(0, 0, 0, 0.78);
  background: rgba(255, 255, 255, 0.92);
  color: var(--text);
  font: inherit;
  font-size: 0.84rem;
  font-weight: 600;
  cursor: pointer;
}

.summary-item[data-state="derived"] .summary-badge {
  background: rgba(15, 118, 110, 0.14);
  color: var(--accent);
}

.summary-item[data-state="invalid"] .summary-badge {
  background: rgba(180, 35, 24, 0.14);
  color: var(--danger);
}

.summary-item[data-state="warning"] .summary-badge {
  background: rgba(161, 98, 7, 0.14);
  color: var(--warning);
}

@media (max-width: 920px) {
  .hero,
  .layout {
    grid-template-columns: 1fr;
    display: grid;
  }

  .hero {
    align-items: start;
  }

  h1 {
    max-width: 14ch;
  }
}