:root {
  --white: #ffffff;
  --navy-950: #071b3d;
  --navy-900: #0b2758;
  --navy-800: #153663;
  --text: #101828;
  --muted: #526079;
  --subtle: #667085;
  --border: #d7dde7;
  --border-strong: #aeb8c8;
  --surface: #f7f9fc;
  --surface-blue: #f4f8ff;
  --crimson: #d3131f;
  --crimson-dark: #b30f19;
  --green: #0a9345;
  --green-text: #087037;
  --focus-ring: #8f0e17;
  --green-soft: #ecf9f1;
  --amber: #a15c00;
  --amber-soft: #fff8e8;
  --red-soft: #fff0f1;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Arial, sans-serif;
  --font-serif: ui-serif, Georgia, Cambria, "Times New Roman", serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  --radius-sm: 6px;
  --radius-md: 10px;
  --content-width: 1586px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--white);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.5;
}

button, input { font: inherit; }

button, a { -webkit-tap-highlight-color: transparent; }

a { color: var(--navy-900); }

button:focus-visible,
a:focus-visible,
.drop-zone:focus-within,
.digest-output:focus-visible {
  outline: 3px solid var(--focus-ring);
  outline-offset: 3px;
}

.section-anchor { scroll-margin-top: 90px; }

.app-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: stretch;
  min-height: 66px;
  padding: 0 max(20px, calc((100vw - var(--content-width)) / 2));
  border-bottom: 1px solid var(--border);
  background: var(--white);
}

.brand {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-width: 300px;
  padding-right: 36px;
  color: var(--navy-950);
  text-decoration: none;
}

.brand strong {
  font-family: var(--font-serif);
  font-size: 21px;
  font-weight: 760;
  letter-spacing: -0.025em;
  line-height: 1.05;
}

.brand small {
  margin-top: 4px;
  color: var(--muted);
  font-size: 10px;
  font-weight: 680;
  letter-spacing: 0.035em;
  text-transform: uppercase;
}

.nav-shell { position: relative; display: flex; min-width: 0; flex: 1; }
.top-nav { display: flex; min-width: 0; flex: 1; align-items: stretch; gap: 50px; overflow-x: auto; scrollbar-width: thin; }
.nav-overflow-cue { display: none; }

.nav-link {
  position: relative;
  display: flex;
  align-items: center;
  min-height: 66px;
  color: var(--navy-950);
  font-size: 15px;
  font-weight: 650;
  text-decoration: none;
  white-space: nowrap;
}

.nav-link::after {
  position: absolute;
  right: 0;
  bottom: 0;
  left: 0;
  height: 3px;
  background: transparent;
  content: "";
}

.nav-link:hover,
.nav-link.is-active { color: var(--crimson); }

.nav-link.is-active::after { background: var(--crimson); }

main {
  width: min(calc(100% - 34px), var(--content-width));
  margin: 16px auto 48px;
}

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

.panel {
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--white);
}

.architecture-panel,
.posture-panel { padding: 20px; }

.panel-heading {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 14px;
}

.panel-heading h1,
.panel-heading h2,
.concept-section h2,
.sources-section h2 {
  margin: 0;
  color: var(--navy-950);
  font-family: var(--font-serif);
  font-size: 20px;
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.016em;
}

.panel-heading p,
.concept-section > div > p,
.sources-heading p {
  margin: 4px 0 0;
  color: var(--muted);
  font-size: 13px;
}

.architecture-map {
  display: flex;
  min-height: 352px;
  flex-direction: column;
  justify-content: center;
  padding: 12px 0 6px;
}

.architecture-zone {
  display: grid;
  grid-template-columns: 88px minmax(0, 1fr);
  gap: 18px;
  align-items: stretch;
}

.mode-rail {
  display: flex;
  min-height: 130px;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border-radius: var(--radius-sm);
  background: var(--navy-900);
  color: var(--white);
  text-align: center;
  font-size: 16px;
  font-weight: 720;
  line-height: 1.2;
}

.mode-rail svg {
  width: 38px;
  height: 38px;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 1.6;
}

.node-stack { display: flex; flex-direction: column; justify-content: center; }

.architecture-node {
  display: flex;
  min-height: 62px;
  align-items: center;
  gap: 18px;
  padding: 8px 20px;
  border: 1.5px solid var(--navy-900);
  border-radius: var(--radius-sm);
}

.architecture-node > svg {
  width: 42px;
  height: 42px;
  flex: 0 0 42px;
  fill: none;
  stroke: var(--navy-900);
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 1.5;
}

.architecture-node .fill-icon { fill: var(--navy-900); stroke: none; }

.architecture-node h2 {
  margin: 0;
  color: var(--navy-950);
  font-family: var(--font-serif);
  font-size: 17px;
  line-height: 1.25;
}

.architecture-node p {
  margin: 3px 0 0;
  color: var(--muted);
  font-size: 13px;
}

.down-arrow { display: flex; height: 20px; align-items: center; justify-content: center; }

.down-arrow svg {
  width: 24px;
  height: 24px;
  fill: none;
  stroke: var(--navy-900);
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 2;
}

.privilege-boundary {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 14px;
  align-items: center;
  margin: 12px 0;
  color: var(--crimson);
  font-size: 15px;
}

.privilege-boundary span { border-top: 2px dashed var(--crimson); }

.concept-note {
  margin: 8px 0 0;
  padding: 8px 12px;
  border: 1px solid #b9cbe4;
  border-radius: var(--radius-sm);
  background: var(--surface-blue);
  color: var(--muted);
  font-size: 12px;
}

.text-button,
.secondary-button,
.primary-button {
  min-height: 44px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 14px;
  font-weight: 680;
}

.text-button {
  border: 0;
  background: transparent;
  color: var(--navy-900);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.secondary-button {
  padding: 0 18px;
  border: 1px solid var(--border-strong);
  background: var(--white);
  color: var(--navy-950);
}

.primary-button {
  padding: 0 18px;
  border: 1px solid var(--crimson);
  background: var(--crimson);
  color: var(--white);
}

.primary-button:hover:not(:disabled) { background: var(--crimson-dark); }
.secondary-button:hover:not(:disabled) { border-color: var(--navy-800); background: var(--surface-blue); }

button:disabled { cursor: not-allowed; opacity: 0.48; }

.requirement-header,
.requirement-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 120px;
  align-items: center;
}

.requirement-header {
  min-height: 38px;
  padding: 0 10px;
  border-bottom: 1px solid var(--border-strong);
  color: var(--subtle);
  font-size: 12px;
  font-weight: 720;
  text-transform: uppercase;
  letter-spacing: 0.055em;
}

.requirement-header span:last-child { text-align: right; }

.requirement-row {
  min-height: 53px;
  padding: 8px 8px 8px 10px;
  border-bottom: 1px solid var(--border);
}

.requirement-copy { display: flex; min-width: 0; align-items: center; gap: 14px; }

.requirement-copy strong { display: block; color: var(--navy-950); font-size: 14px; line-height: 1.25; }
.requirement-copy small { display: block; margin-top: 2px; color: var(--subtle); font-size: 11px; line-height: 1.25; }

.requirement-symbol {
  display: flex;
  width: 34px;
  height: 34px;
  flex: 0 0 34px;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--surface);
  color: var(--navy-900);
  font-size: 12px;
  font-weight: 800;
}

.requirement-symbol svg {
  width: 22px;
  height: 22px;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 1.7;
}

.switch {
  display: inline-grid;
  width: 102px;
  height: 44px;
  grid-template-columns: 46px 1fr;
  align-items: center;
  justify-self: end;
  border: 0;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
}

.switch::before {
  grid-column: 1;
  grid-row: 1;
  width: 44px;
  height: 24px;
  border-radius: 999px;
  background: #c7ced8;
  content: "";
}

.switch-thumb {
  z-index: 1;
  grid-column: 1;
  grid-row: 1;
  width: 18px;
  height: 18px;
  margin-left: 3px;
  border-radius: 50%;
  background: var(--white);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.28);
  transition: transform 150ms ease;
}

.switch-label { grid-column: 2; grid-row: 1; font-size: 13px; font-weight: 650; }

.switch[aria-checked="true"]::before { background: var(--green); }
.switch[aria-checked="true"] .switch-thumb { transform: translateX(20px); }
.switch[aria-checked="true"] .switch-label { color: var(--green-text); }

.posture-result {
  display: grid;
  grid-template-columns: 58px minmax(0, 1fr);
  gap: 14px;
  align-items: start;
  min-height: 112px;
  margin-top: 14px;
  padding: 14px;
  border-radius: var(--radius-sm);
}

.posture-result.is-incomplete { border: 1px solid #efd8a4; background: var(--amber-soft); }
.posture-result.is-complete { border: 1px solid #acdcbc; background: var(--green-soft); }

.result-icon {
  display: flex;
  width: 54px;
  height: 54px;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: var(--amber);
  color: var(--white);
}

.is-complete .result-icon { background: var(--green); }

.result-icon svg {
  width: 32px;
  height: 32px;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 1.8;
}

.posture-result h3 { margin: 1px 0 5px; color: var(--navy-950); font-size: 17px; line-height: 1.3; }
.posture-result p { margin: 0; color: var(--muted); font-size: 13px; }
.missing-list { display: flex; flex-wrap: wrap; gap: 4px 14px; margin: 9px 0 0; padding: 0; color: var(--amber); font-size: 11px; list-style: none; }
.missing-list li::before { margin-right: 5px; content: "•"; }

.integrity-panel { margin-top: 18px; padding: 14px 22px 16px; }

.integrity-workflow {
  display: grid;
  grid-template-columns: 1.25fr 1.45fr 0.9fr 0.95fr 0.8fr;
  border-top: 1px solid var(--border);
}

.integrity-step {
  min-width: 0;
  min-height: 164px;
  padding: 12px 20px;
  border-right: 1px solid var(--border);
}

.integrity-step:first-child { padding-left: 0; }
.integrity-step:last-child { padding-right: 0; border-right: 0; }

.integrity-step h3 {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 12px;
  color: var(--navy-950);
  font-size: 15px;
}

.integrity-step h3 span {
  display: inline-flex;
  width: 23px;
  height: 23px;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: var(--navy-900);
  color: var(--white);
  font-size: 12px;
}

.drop-zone {
  display: flex;
  min-height: 82px;
  align-items: center;
  gap: 14px;
  padding: 14px;
  border: 1.5px dashed var(--border-strong);
  border-radius: var(--radius-sm);
  background: var(--surface);
  cursor: pointer;
}

.drop-zone.is-dragging { border-color: var(--crimson); background: var(--red-soft); }
.drop-zone:hover { border-color: var(--navy-800); }

.drop-zone > svg {
  width: 38px;
  height: 38px;
  flex: 0 0 38px;
  fill: none;
  stroke: var(--navy-900);
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 1.5;
}

.drop-zone span { min-width: 0; }
.drop-zone strong { display: block; color: var(--navy-950); font-size: 13px; }
.drop-zone small { display: block; margin-top: 3px; color: var(--subtle); font-size: 11px; }
.drop-zone input { position: absolute; width: 1px; height: 1px; overflow: hidden; opacity: 0; }

.sample-actions { display: flex; flex-wrap: wrap; gap: 4px 12px; margin-top: 5px; }

.sample-button {
  min-height: 44px;
  padding: 0;
  border: 0;
  background: transparent;
  color: var(--navy-900);
  cursor: pointer;
  font-size: 11px;
  font-weight: 680;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.sample-button:hover { color: var(--crimson); }

.step-meta,
.step-copy { margin: 10px 0 14px; color: var(--muted); font-size: 12px; overflow-wrap: anywhere; }

.digest-output {
  min-height: 82px;
  padding: 13px;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  background: var(--surface);
  color: var(--navy-950);
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.55;
  overflow-wrap: anywhere;
}

.digest-step .secondary-button { margin-top: 10px; }
.button-stack { display: flex; flex-direction: column; align-items: flex-start; gap: 4px; }

.integrity-result {
  display: flex;
  min-height: 94px;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  text-align: center;
}

.integrity-result strong { color: var(--navy-950); font-size: 25px; line-height: 1; }
.integrity-result span { color: var(--muted); font-size: 11px; }
.integrity-result.is-match { border-color: #8fd0a6; background: var(--green-soft); }
.integrity-result.is-match strong { color: var(--green-text); }
.integrity-result.is-mismatch { border-color: #edb3b7; background: var(--red-soft); }
.integrity-result.is-mismatch strong { color: var(--crimson); }

.hash-status { min-height: 20px; margin: 10px 0 0; color: var(--muted); font-size: 12px; }
.hash-error { margin: 8px 0 0; padding: 9px 12px; border: 1px solid #edb3b7; border-radius: var(--radius-sm); background: var(--red-soft); color: var(--crimson-dark); font-size: 12px; }

.education-note {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-top: 18px;
  padding: 15px 20px;
  border: 1px solid #9cb5da;
  border-radius: var(--radius-sm);
  background: var(--surface-blue);
  color: var(--navy-900);
}

.education-note svg {
  width: 31px;
  height: 31px;
  flex: 0 0 31px;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 1.6;
}

.education-note p { margin: 0; font-size: 12px; }

.concept-section,
.sources-section { margin-top: 54px; }

.concept-section { display: grid; grid-template-columns: 0.72fr 1.28fr; gap: 56px; align-items: start; }

.concept-list { display: grid; grid-template-columns: 1fr 1fr; margin: 0; border-top: 1px solid var(--border-strong); }
.concept-list div { padding: 14px 20px 14px 0; border-bottom: 1px solid var(--border); }
.concept-list div:nth-child(odd) { margin-right: 22px; }
.concept-list dt { color: var(--navy-950); font-size: 14px; font-weight: 760; }
.concept-list dd { margin: 3px 0 0; color: var(--muted); font-size: 12px; }

.sources-heading { margin-bottom: 14px; }
.source-table-wrapper { overflow-x: auto; border: 1px solid var(--border); border-radius: var(--radius-sm); }
table { width: 100%; border-collapse: collapse; font-size: 12px; }
th, td { padding: 13px 15px; border-bottom: 1px solid var(--border); text-align: left; vertical-align: top; }
th { background: var(--navy-900); color: var(--white); font-size: 11px; text-transform: uppercase; letter-spacing: 0.04em; }
tbody tr:last-child td { border-bottom: 0; }
td:first-child { width: 32%; font-weight: 650; }
td:nth-child(2) { width: 31%; }
td { color: var(--muted); }
td a { color: var(--navy-900); font-weight: 720; }

.limitations-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; margin-top: 22px; }
.limitations-grid div { padding-top: 13px; border-top: 2px solid var(--crimson); }
.limitations-grid strong { display: block; color: var(--navy-950); font-size: 13px; }
.limitations-grid span { display: block; margin-top: 4px; color: var(--muted); font-size: 12px; }

footer {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  width: min(calc(100% - 34px), var(--content-width));
  margin: 0 auto;
  padding: 20px 0 28px;
  border-top: 1px solid var(--border);
  color: var(--subtle);
  font-size: 11px;
}

@media (max-width: 1180px) {
  .brand { min-width: 260px; }
  .top-nav { gap: 34px; }
  .workspace { grid-template-columns: 1fr; }
  .architecture-map { min-height: auto; }
  .integrity-workflow { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .integrity-step { border-bottom: 1px solid var(--border); }
  .integrity-step:first-child { padding-left: 20px; }
  .integrity-step:nth-child(even) { border-right: 0; }
  .integrity-step:last-child { grid-column: 1 / -1; min-height: auto; padding: 15px 20px; border-bottom: 0; }
  .integrity-result { min-height: 92px; }
}

@media (max-width: 720px) {
  .app-header { position: relative; flex-direction: column; min-height: auto; padding: 0 16px; }
  .brand { min-width: 0; min-height: 64px; align-items: flex-start; padding: 0; }
  .nav-shell { margin-right: -16px; }
  .top-nav { gap: 24px; padding-right: 58px; overflow-x: auto; scroll-snap-type: x proximity; }
  .nav-link { scroll-snap-align: start; }
  .nav-overflow-cue {
    position: absolute;
    right: 10px;
    bottom: 8px;
    display: inline-flex;
    width: 34px;
    height: 32px;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--border-strong);
    border-radius: var(--radius-sm);
    background: var(--white);
    color: var(--navy-900);
    font-size: 15px;
    font-weight: 700;
  }
  .nav-link { min-height: 48px; white-space: nowrap; }
  main { width: min(calc(100% - 24px), var(--content-width)); margin-top: 12px; }
  .section-anchor { scroll-margin-top: 12px; }
  .architecture-panel, .posture-panel, .integrity-panel { padding: 16px; }
  .panel-heading { align-items: center; }
  .panel-heading h1, .panel-heading h2, .concept-section h2, .sources-section h2 { font-size: 18px; }
  .architecture-zone { grid-template-columns: 64px minmax(0, 1fr); gap: 10px; }
  .mode-rail { min-height: 158px; font-size: 13px; }
  .mode-rail svg { width: 30px; height: 30px; }
  .architecture-node { min-height: 74px; gap: 11px; padding: 10px 12px; }
  .architecture-node > svg { width: 36px; height: 36px; flex-basis: 36px; }
  .architecture-node h2 { font-size: 14px; }
  .architecture-node p { font-size: 11px; }
  .privilege-boundary { gap: 8px; font-size: 12px; }
  .requirement-header { display: none; }
  .requirement-row { grid-template-columns: minmax(0, 1fr) 98px; padding-left: 0; }
  .requirement-copy small { display: none; }
  .switch { width: 96px; }
  .posture-result { grid-template-columns: 48px minmax(0, 1fr); gap: 12px; padding: 14px; }
  .result-icon { width: 46px; height: 46px; }
  .result-icon svg { width: 28px; height: 28px; }
  .posture-result h3 { font-size: 14px; }
  .integrity-workflow { grid-template-columns: 1fr; }
  .integrity-step, .integrity-step:first-child, .integrity-step:last-child { grid-column: auto; min-height: auto; padding: 16px 0; border-right: 0; border-bottom: 1px solid var(--border); }
  .integrity-step:last-child { border-bottom: 0; }
  .concept-section { grid-template-columns: 1fr; gap: 22px; }
  .concept-list { grid-template-columns: 1fr; }
  .concept-list div:nth-child(odd) { margin-right: 0; }
  .limitations-grid { grid-template-columns: 1fr; gap: 12px; }
  footer { flex-direction: column; width: min(calc(100% - 24px), var(--content-width)); }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .switch-thumb { transition: none; }
}