:root {
  color-scheme: light dark;
  --bg: #f4f6f8;
  --surface: #ffffff;
  --surface-2: #eef2f5;
  --text: #172033;
  --muted: #5d6879;
  --line: #d7dce5;
  --accent: #235a74;
  --accent-strong: #17465e;
  --accent-soft: #e4f0f5;
  --on-accent: #ffffff;
  --success: #176b52;
  --warning: #8a5a12;
  --danger: #9d3030;
  --shadow: 0 18px 50px rgba(23, 32, 51, .08);
  --radius: 18px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0e141d;
    --surface: #151d28;
    --surface-2: #1c2633;
    --text: #edf2f7;
    --muted: #aab5c3;
    --line: #334052;
    --accent: #79b8d3;
    --accent-strong: #a2d2e5;
    --accent-soft: #193447;
    --on-accent: #0e141d;
    --success: #77c9aa;
    --warning: #e6b45f;
    --danger: #ef9292;
    --shadow: none;
  }
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  min-width: 320px;
  background: var(--bg);
  color: var(--text);
  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.55;
  overflow-x: clip;
}
button, input, select, textarea { font: inherit; }
a { color: var(--accent-strong); }
button, .button {
  min-height: 44px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--surface);
  color: var(--text);
  padding: .72rem 1rem;
  cursor: pointer;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .45rem;
}
button:hover, .button:hover { border-color: var(--accent); }
button:focus-visible, a:focus-visible, input:focus-visible, select:focus-visible, textarea:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--accent) 45%, transparent);
  outline-offset: 2px;
}
button.primary, .button.primary {
  border-color: var(--accent);
  background: var(--accent);
  color: var(--on-accent);
}
button.primary:hover, .button.primary:hover { background: var(--accent-strong); }
button.ghost, .button.ghost { background: transparent; }
button:disabled { cursor: not-allowed; opacity: .5; }

.skip-link {
  position: absolute;
  left: 1rem;
  top: -5rem;
  z-index: 20;
  background: var(--surface);
  padding: .75rem 1rem;
  border-radius: 10px;
}
.skip-link:focus { top: 1rem; }
.shell { width: min(1120px, calc(100% - 2rem)); margin-inline: auto; }
.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  border-bottom: 1px solid color-mix(in srgb, var(--line) 75%, transparent);
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(16px);
}
.header-inner { min-height: 68px; display: flex; align-items: center; justify-content: space-between; gap: 1.5rem; }
.brand { display: inline-flex; align-items: center; gap: .75rem; color: var(--text); text-decoration: none; font-weight: 700; }
.brand-mark { display: inline-grid; place-items: center; width: 38px; height: 38px; border-radius: 12px; background: var(--accent); color: var(--on-accent); font-size: .78rem; letter-spacing: .08em; }
nav { display: flex; align-items: center; gap: 1.1rem; }
nav a { text-decoration: none; color: var(--muted); font-weight: 600; font-size: .95rem; }
nav a:hover { color: var(--text); }
main { min-height: calc(100vh - 150px); padding-block: 3.5rem 5rem; }
main:focus { outline: none; }
#decision-step-heading, #case-step-heading { scroll-margin-top: 86px; }
.site-footer { border-top: 1px solid var(--line); color: var(--muted); }
.footer-inner { display: flex; justify-content: space-between; gap: 1rem; padding-block: 1.4rem; font-size: .9rem; }

.hero { display: grid; gap: 2rem; align-items: center; grid-template-columns: minmax(0, 1.35fr) minmax(280px, .65fr); padding-block: 2rem 3rem; }
.eyebrow { color: var(--accent-strong); font-weight: 800; letter-spacing: .08em; text-transform: uppercase; font-size: .77rem; }
h1, h2, h3 { line-height: 1.15; margin: 0; }
h1 { font-size: clamp(2.3rem, 5vw, 4.7rem); letter-spacing: -.045em; max-width: 14ch; }
h2 { font-size: clamp(1.65rem, 3vw, 2.45rem); letter-spacing: -.025em; }
h3 { font-size: 1.08rem; }
p { margin: 0; }
.lede { color: var(--muted); font-size: clamp(1.05rem, 2vw, 1.24rem); max-width: 66ch; }
.stack { display: grid; gap: 1rem; }
.actions { display: flex; flex-wrap: wrap; gap: .75rem; }

.panel, .card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}
.panel { padding: clamp(1.25rem, 3vw, 2rem); min-width: 0; }
.card { padding: 1.25rem; }
.card-link { color: inherit; text-decoration: none; transition: transform .16s ease, border-color .16s ease; }
.card-link:hover { transform: translateY(-2px); border-color: var(--accent); }
.soft-panel { background: var(--accent-soft); border: 1px solid var(--line); border-radius: var(--radius); padding: 1.25rem; }
.grid-3 { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1rem; }
.grid-2 { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1rem; }
.metrics { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: .85rem; }
.metric { background: var(--surface); border: 1px solid var(--line); border-radius: 16px; padding: 1rem; }
.metric .value { display: block; margin-top: .2rem; font-size: clamp(1.45rem, 3vw, 2.1rem); font-weight: 800; letter-spacing: -.03em; }
.metric .label, .muted, .help { color: var(--muted); }
.metric .label, .help { font-size: .88rem; }

.badge { display: inline-flex; align-items: center; gap: .35rem; width: fit-content; padding: .28rem .65rem; border: 1px solid var(--line); border-radius: 999px; background: var(--surface-2); color: var(--text); font-size: .78rem; font-weight: 700; }
.badge.measured { color: var(--success); }
.badge.reported { color: var(--warning); }
.badge.interpreted { color: var(--danger); }
.badge.assumed { color: var(--warning); border-style: dashed; }
.section-head { display: flex; justify-content: space-between; gap: 1rem; align-items: end; margin-bottom: 1.25rem; }
.section-head p { color: var(--muted); max-width: 65ch; }
.breadcrumbs { display: flex; gap: .5rem; align-items: center; color: var(--muted); font-size: .9rem; margin-bottom: 1rem; }
.breadcrumbs a { color: inherit; }

.flow { display: grid; grid-template-columns: repeat(6, minmax(0, 1fr)); gap: .65rem; }
.flow-step { padding: .9rem; border: 1px solid var(--line); border-radius: 14px; background: var(--surface); font-size: .9rem; }
.flow-step strong { display: block; margin-bottom: .25rem; }

.dataset-head { display: grid; gap: 1.1rem; margin-bottom: 1.5rem; }
.toolbar { display: flex; flex-wrap: wrap; align-items: end; gap: .75rem; }
.field { display: grid; gap: .35rem; min-width: 180px; flex: 1; }
.field label, label.field { color: var(--text); font-size: .9rem; font-weight: 700; }
input, select, textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--surface);
  color: var(--text);
  padding: .72rem .8rem;
}
textarea { min-height: 110px; resize: vertical; }
.table-wrap { overflow-x: auto; max-width: 100%; min-width: 0; contain: layout paint; border: 1px solid var(--line); border-radius: 14px; }
table { width: 100%; border-collapse: collapse; min-width: 680px; background: var(--surface); }
th, td { padding: .78rem .85rem; text-align: left; border-bottom: 1px solid var(--line); vertical-align: top; }

caption {
  text-align: left;
  padding: .75rem .85rem;
  font-weight: 800;
  color: var(--text);
  background: var(--surface-2);
  border-bottom: 1px solid var(--line);
}
.matrix-details > summary {
  display: grid;
  gap: .25rem;
  padding: .25rem 0;
}
.matrix-details .table-wrap {
  max-height: min(68vh, 760px);
}
th { position: sticky; top: 0; background: var(--surface-2); font-size: .82rem; }
td { font-size: .9rem; }
tr:last-child td { border-bottom: 0; }
code { overflow-wrap: anywhere; }

.bar-list { display: grid; gap: .75rem; }
.bar-row { display: grid; grid-template-columns: minmax(130px, .8fr) minmax(160px, 2fr) auto; gap: .75rem; align-items: center; font-size: .9rem; }
.bar-track { height: 10px; border-radius: 999px; background: var(--surface-2); overflow: hidden; }
.bar-fill { height: 100%; border-radius: inherit; background: var(--accent); }

.wizard { display: grid; grid-template-columns: 220px minmax(0, 1fr); gap: 1rem; align-items: start; }
.wizard-nav { display: grid; gap: .45rem; padding: .65rem; position: sticky; top: 86px; }
.wizard-step { justify-content: flex-start; text-align: left; background: transparent; border-color: transparent; }
.wizard-step[aria-current="step"] { background: var(--accent-soft); border-color: var(--accent); }
.wizard-step .number { display: grid; place-items: center; width: 28px; height: 28px; border-radius: 999px; background: var(--surface-2); font-size: .8rem; font-weight: 800; }
.wizard-step[aria-current="step"] .number { background: var(--accent); color: var(--on-accent); }
.wizard-content { min-width: 0; }
.wizard-actions { display: flex; justify-content: space-between; align-items: center; gap: 1rem; margin-top: 1.25rem; }
.dropzone { padding: 2rem; border: 1.5px dashed var(--line); border-radius: 16px; background: var(--surface-2); text-align: center; }
.file-summary { display: grid; gap: .75rem; margin-top: 1rem; }
.hash { font-family: ui-monospace, SFMono-Regular, Consolas, monospace; font-size: .78rem; overflow-wrap: anywhere; color: var(--muted); }
.canvas-shell { position: relative; border: 1px solid var(--line); border-radius: 16px; overflow: hidden; background: #0f1720; min-height: 300px; display: grid; place-items: center; }
canvas { display: block; max-width: 100%; height: auto; cursor: crosshair; }
.canvas-empty { padding: 2rem; text-align: center; color: #ccd4de; }
.result-grid { display: grid; grid-template-columns: repeat(3, minmax(0,1fr)); gap: .75rem; }
.result { border: 1px solid var(--line); border-radius: 14px; padding: .9rem; }
.result strong { display: block; font-size: 1.25rem; margin-top: .2rem; }
.callout { border-left: 4px solid var(--accent); background: var(--accent-soft); border-radius: 0 14px 14px 0; padding: 1rem 1.1rem; }
.warning { border-left-color: var(--warning); }
.danger { border-left-color: var(--danger); }
.check-list { display: grid; gap: .6rem; }
.check-row { display: flex; align-items: flex-start; gap: .65rem; }
.check-row input { width: auto; margin-top: .25rem; }
.evidence-ladder { display: grid; grid-template-columns: repeat(8, minmax(0,1fr)); gap: .25rem; }
.evidence-segment { height: 11px; border-radius: 999px; background: var(--surface-2); }
.evidence-segment.active { background: var(--accent); }
.empty { padding: 2rem; text-align: center; color: var(--muted); }
.status-line { min-height: 1.5rem; color: var(--muted); font-size: .9rem; }

@media (max-width: 860px) {
  nav a:nth-last-child(1) { display: none; }
  .hero, .wizard { grid-template-columns: 1fr; }
  .wizard-nav { position: static; grid-template-columns: repeat(5, minmax(0,1fr)); overflow-x: auto; }
  .wizard-step { justify-content: center; padding-inline: .5rem; }
  .wizard-step .step-label { display: none; }
  .grid-3, .metrics { grid-template-columns: repeat(2, minmax(0,1fr)); }
  .flow { grid-template-columns: repeat(3, minmax(0,1fr)); }
}

@media (max-width: 760px) {
  .shell { width: min(100% - 1rem, 1120px); }
  .header-inner { min-height: 60px; }
  .brand span:last-child { display: none; }
  nav { gap: .7rem; }
  nav a { font-size: .85rem; }
  main { padding-block: 2rem 3rem; }
  .grid-2, .grid-3, .metrics, .result-grid { grid-template-columns: 1fr; }
  .flow { grid-template-columns: repeat(2, minmax(0,1fr)); }
  .section-head, .footer-inner { align-items: flex-start; flex-direction: column; }
  .bar-row { grid-template-columns: 110px minmax(100px,1fr) auto; }
  .wizard-nav { grid-template-columns: repeat(5, 1fr); }
}

/* Frontier Decision Engine v0.2 decision workflow */
.page-title { font-size: clamp(2.1rem, 5vw, 4rem); max-width: 16ch; }
.decision-wizard { grid-template-columns: 240px minmax(0, 1fr); }
.decision-map { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1rem; }
.map-item { border-top: 1px solid var(--line); padding-top: .85rem; display: grid; gap: .45rem; }
.map-item:first-of-type { border-top: 0; padding-top: 0; }
.score-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: .75rem; }
.score-field { display: grid; gap: .35rem; font-size: .88rem; font-weight: 700; }
.metric-card-like { background: var(--surface); border: 1px solid var(--line); border-radius: 16px; padding: 1rem; display: grid; gap: .55rem; }
.metric-card-like.candidate { border-color: var(--accent); background: var(--accent-soft); }
.metric-card-like.candidate.has-critical-gaps { border-color: var(--warning); }
.metric-card-like > strong { min-height: 2.5em; }
.big-number { font-size: clamp(2rem, 4vw, 3rem); font-weight: 850; letter-spacing: -.04em; }
.result-line { display: flex; justify-content: space-between; gap: 1rem; border-top: 1px solid var(--line); padding-top: .55rem; font-size: .9rem; }
.vulnerability { display: grid; grid-template-columns: minmax(0, 1.2fr) minmax(220px, .8fr); gap: 1rem; padding: 1rem 0; border-top: 1px solid var(--line); align-items: center; }
.vulnerability:first-of-type { border-top: 0; }
.vulnerability.is-vulnerable { border-left: 3px solid var(--warning); padding-left: .8rem; }
.vulnerability.is-resilient { border-left: 3px solid var(--success); padding-left: .8rem; }
.decision-brief { display: grid; gap: 1.25rem; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: clamp(1.25rem, 3vw, 2rem); }
.brief-head { display: flex; justify-content: space-between; gap: 1rem; align-items: flex-start; }
.brief-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: .75rem; }
.brief-grid > div { border: 1px solid var(--line); border-radius: 14px; padding: .85rem; display: grid; gap: .25rem; }
.decision-brief ul { margin: 0; padding-left: 1.25rem; }
.decision-brief li + li { margin-top: .4rem; }
details > summary { cursor: pointer; }

@media (max-width: 960px) {
  .decision-wizard { grid-template-columns: 1fr; }
  .decision-wizard .wizard-nav { position: static; grid-template-columns: repeat(6, minmax(0, 1fr)); overflow-x: auto; }
  .score-grid, .brief-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 680px) {
  .decision-map, .score-grid, .brief-grid { grid-template-columns: 1fr; }
  .vulnerability, .brief-head { grid-template-columns: 1fr; display: grid; }
  .decision-wizard .wizard-nav { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .decision-wizard .wizard-step .step-label { display: inline; font-size: .75rem; }
}

#decision-step-heading:focus-visible { outline: 3px solid color-mix(in srgb, var(--accent) 45%, transparent); outline-offset: .3rem; }
[aria-invalid="true"] { border-color: var(--danger); box-shadow: 0 0 0 2px color-mix(in srgb, var(--danger) 24%, transparent); }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
}
@media (max-width: 620px) { nav a:nth-child(4) { display: none; } }
@media (max-width: 390px) { nav a:nth-child(3) { display: none; } }

#case-step-heading:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--accent) 45%, transparent);
  outline-offset: .3rem;
}

.decision-section > summary {
  list-style-position: outside;
  padding: .25rem 0;
}
.decision-section-body {
  margin-top: 1rem;
}
@media print {
  .site-header, .site-footer, .breadcrumbs, .wizard-nav, .wizard-actions,
  .decision-brief > .actions, .decision-brief + .actions { display: none !important; }
  body { background: #fff; color: #000; }
  main, .shell { width: 100%; max-width: none; padding: 0; margin: 0; }
  .decision-wizard { display: block; }
  .wizard-content.panel, .decision-brief { border: 0; box-shadow: none; padding: 0; }
  .decision-section > summary { display: none; }
  .decision-section { border: 0; padding: 0; break-inside: avoid; }
}