@font-face {
  font-family: "Hanken Grotesk";
  src: url("../../assets/fonts/hanken-400.ttf") format("truetype");
  font-weight: 400;
  font-display: swap;
}

@font-face {
  font-family: "Hanken Grotesk";
  src: url("../../assets/fonts/hanken-600.ttf") format("truetype");
  font-weight: 600;
  font-display: swap;
}

@font-face {
  font-family: "Hanken Grotesk";
  src: url("../../assets/fonts/hanken-800.ttf") format("truetype");
  font-weight: 800;
  font-display: swap;
}

@font-face {
  font-family: "IBM Plex Mono";
  src: url("../../assets/fonts/ibm-plex-mono-500.ttf") format("truetype");
  font-weight: 500;
  font-display: swap;
}

.system-page {
  max-width: var(--max);
}

.system-nav a {
  white-space: nowrap;
}

.system-hero {
  min-height: calc(100dvh - 72px);
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(320px, 0.75fr);
  gap: clamp(44px, 7vw, 100px);
  align-items: center;
  padding: clamp(56px, 7vw, 96px) clamp(24px, 6vw, 84px);
  border-bottom: 1px solid var(--line);
}

.system-hero-copy h1 {
  max-width: 820px;
  margin: 0;
  font-size: clamp(48px, 6vw, 88px);
  line-height: 0.94;
  letter-spacing: -0.06em;
  text-wrap: balance;
}

.system-hero-summary {
  max-width: 690px;
  margin: 28px 0 0;
  color: var(--muted);
  font-size: clamp(19px, 2vw, 24px);
  line-height: 1.4;
}

.system-hero-note {
  align-self: stretch;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: clamp(28px, 4vw, 48px);
  border-left: 3px solid var(--accent);
  background: var(--surface);
}

.system-hero-note dl {
  margin: 0;
}

.system-hero-note dl div {
  padding: 20px 0;
  border-top: 1px solid var(--line);
}

.system-hero-note dl div:last-child {
  padding-bottom: 0;
}

.system-hero-note dt {
  color: var(--faint);
  font: 500 11px/1.4 "IBM Plex Mono", monospace;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.system-hero-note dd {
  margin: 7px 0 0;
  color: var(--ink);
  font-size: 17px;
  line-height: 1.45;
}

.problem-section,
.layers-section,
.value-section,
.proof-section,
.boundary-section,
.contribution-section,
.system-contact {
  padding: clamp(72px, 9vw, 124px) clamp(24px, 6vw, 84px);
  border-bottom: 1px solid var(--line);
}

.section-copy {
  max-width: 820px;
}

.section-copy h2,
.system-contact h2 {
  margin: 0;
  font-size: clamp(38px, 5vw, 68px);
  line-height: 1;
  letter-spacing: -0.048em;
  text-wrap: balance;
}

.section-copy > p:not(.eyebrow),
.system-contact > div > p {
  max-width: 690px;
  margin: 22px 0 0;
  color: var(--muted);
  font-size: clamp(18px, 1.8vw, 22px);
  line-height: 1.48;
}

.execution-compare {
  display: grid;
  grid-template-columns: 0.8fr 1.2fr;
  margin-top: clamp(42px, 6vw, 72px);
  border: 1px solid var(--line);
}

.execution-compare article {
  padding: clamp(28px, 4vw, 48px);
}

.execution-compare article + article {
  border-left: 1px solid var(--line);
}

.execution-compare .compare-active {
  background: var(--surface);
  box-shadow: inset 0 3px 0 var(--accent);
}

.execution-compare h3 {
  margin: 0;
  font-size: clamp(24px, 2.5vw, 34px);
  letter-spacing: -0.03em;
}

.execution-compare ol {
  display: grid;
  gap: 0;
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
}

.execution-compare li {
  display: grid;
  grid-template-columns: 44px 1fr;
  gap: 16px;
  align-items: center;
  min-height: 58px;
  border-top: 1px solid var(--line);
  color: var(--muted);
}

.execution-compare li span {
  color: var(--accent);
  font: 500 11px/1 "IBM Plex Mono", monospace;
}

.compare-result {
  margin: 24px 0 0;
  color: var(--ink);
  font-weight: 800;
}

.layers-section {
  background: var(--surface);
}

.layer-stack {
  margin: clamp(44px, 6vw, 72px) 0 0;
  padding: 0;
  border: 1px solid var(--line);
  list-style: none;
}

.layer-stack li {
  display: grid;
  grid-template-columns: 64px minmax(180px, 0.8fr) minmax(220px, 1.15fr) minmax(220px, 1fr);
  gap: 24px;
  align-items: center;
  padding: 26px 30px;
}

.layer-stack li + li {
  border-top: 1px solid var(--line);
}

.layer-stack .layer-highlight {
  background: var(--accent-soft);
  box-shadow: inset 3px 0 0 var(--accent);
}

.layer-stack .layer-highlight .layer-number,
.layer-stack .layer-highlight div > p {
  color: var(--ink);
}

.layer-number,
.layer-stack div > p {
  color: var(--faint);
  font: 500 11px/1.4 "IBM Plex Mono", monospace;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.layer-stack div > p,
.layer-stack li > p {
  margin: 0;
}

.layer-stack h3 {
  margin: 5px 0 0;
  font-size: 25px;
  line-height: 1.1;
}

.layer-stack li > strong {
  line-height: 1.35;
}

.layer-stack li > p {
  color: var(--muted);
  font-size: 15px;
}

.value-section {
  background: var(--surface);
}

.value-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin-top: clamp(44px, 6vw, 72px);
  border-top: 1px solid var(--line);
}

.value-list article {
  min-height: 290px;
  padding: 34px 38px 38px 0;
  border-bottom: 1px solid var(--line);
}

.value-list article:nth-child(odd) {
  padding-right: clamp(28px, 5vw, 72px);
  border-right: 1px solid var(--line);
}

.value-list article:nth-child(even) {
  padding-left: clamp(28px, 5vw, 72px);
}

.value-capability {
  margin: 0;
  color: var(--accent);
  font: 500 11px/1.4 "IBM Plex Mono", monospace;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.value-list h3 {
  max-width: 520px;
  margin: 16px 0 0;
  font-size: clamp(25px, 2.6vw, 38px);
  line-height: 1.05;
  letter-spacing: -0.035em;
}

.value-list article > p:not(.value-capability) {
  max-width: 560px;
  margin: 18px 0 0;
  color: var(--muted);
}

.value-list strong {
  display: block;
  margin-top: 24px;
  color: var(--ink);
  font-size: 15px;
}

.proof-heading {
  max-width: 900px;
}

.proof-flow {
  display: grid;
  grid-template-columns: 0.78fr 1.12fr 1fr;
  gap: 18px;
  align-items: start;
  margin-top: clamp(46px, 6vw, 74px);
}

.proof-flow figure {
  min-width: 0;
  margin: 0;
  border: 1px solid var(--line);
  background: var(--surface);
}

.proof-workorder {
  min-height: 100%;
  padding: clamp(28px, 4vw, 44px);
  border: 1px solid var(--line);
  background: var(--accent-soft);
  box-shadow: inset 3px 0 0 var(--accent);
}

.proof-workorder > .value-capability {
  color: var(--ink);
}

.proof-workorder blockquote {
  margin: 20px 0 0;
  color: var(--ink);
  font-size: clamp(27px, 2.8vw, 40px);
  font-weight: 800;
  line-height: 1.08;
  letter-spacing: -0.035em;
}

.proof-workorder ol {
  display: grid;
  gap: 0;
  margin: 30px 0 0;
  padding: 0;
  list-style: none;
}

.proof-workorder li {
  display: grid;
  gap: 7px;
  padding: 18px 0;
  border-top: 1px solid var(--line);
}

.proof-workorder li span {
  color: var(--ink);
  font: 500 11px/1.4 "IBM Plex Mono", monospace;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.proof-workorder li strong {
  font-size: 16px;
  line-height: 1.35;
}

.proof-workorder-result {
  margin: 24px 0 0;
  color: var(--ink);
  font-weight: 800;
}

.proof-image {
  aspect-ratio: 1 / 1.05;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
  background: var(--surface-strong);
}

.proof-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: top center;
}

.proof-image-resume img {
  object-fit: contain;
  padding: 14px;
  background: #d8dbe2;
}

.proof-flow figcaption {
  padding: 24px;
}

.proof-flow figcaption span {
  display: block;
  color: var(--accent);
  font: 500 11px/1.4 "IBM Plex Mono", monospace;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.proof-flow figcaption strong {
  display: block;
  margin-top: 10px;
  font-size: 22px;
  line-height: 1.15;
}

.proof-flow figcaption p {
  margin: 14px 0 0;
  color: var(--muted);
  font-size: 16px;
}

.verification-record {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin-top: 18px;
  border: 1px solid var(--line);
}

.verification-record > div {
  display: grid;
  grid-template-columns: 16px 1fr;
  gap: 14px;
  padding: 24px;
}

.verification-record > div + div {
  border-left: 1px solid var(--line);
}

.verification-record p {
  margin: 0;
  color: var(--muted);
  font-size: 15px;
}

.verification-record strong {
  color: var(--ink);
  font-size: 17px;
}

.verification-mark {
  width: 12px;
  height: 12px;
  margin-top: 6px;
  border: 3px solid var(--accent);
  background: var(--accent-soft);
}

.scenario-request {
  display: grid;
  grid-template-columns: minmax(260px, 0.9fr) minmax(280px, 1.1fr);
  gap: 24px 54px;
  align-items: end;
  margin-top: clamp(44px, 6vw, 72px);
  padding: clamp(28px, 5vw, 54px);
  border: 1px solid var(--line);
  background: var(--accent-soft);
  box-shadow: inset 3px 0 0 var(--accent);
}

.scenario-request .mono-label {
  grid-column: 1 / -1;
  margin: 0;
  color: var(--ink);
}

.scenario-request blockquote {
  margin: 0;
  color: var(--ink);
  font-size: clamp(34px, 4.3vw, 62px);
  font-weight: 800;
  line-height: 0.98;
  letter-spacing: -0.045em;
}

.scenario-request > p:last-child {
  margin: 0;
  color: var(--muted);
  font-size: clamp(18px, 1.8vw, 22px);
}

.scenario-flow {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  margin: 18px 0 0;
  padding: 1px;
  background: var(--line);
  list-style: none;
}

.scenario-flow li {
  min-height: 230px;
  padding: clamp(26px, 4vw, 40px);
  background: var(--surface);
}

.scenario-flow .scenario-approval {
  background: var(--bg);
  box-shadow: inset 0 3px 0 var(--accent);
}

.scenario-flow span {
  display: block;
  color: var(--faint);
  font: 500 11px/1 "IBM Plex Mono", monospace;
}

.scenario-flow strong {
  display: block;
  margin-top: 34px;
  font-size: 28px;
  line-height: 1;
}

.scenario-flow p {
  margin: 16px 0 0;
  color: var(--muted);
  font-size: 16px;
}

.scenario-boundary {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin-top: 18px;
  border: 1px solid var(--line);
}

.scenario-boundary article {
  padding: clamp(28px, 4vw, 44px);
}

.scenario-boundary article + article {
  border-left: 1px solid var(--line);
}

.scenario-boundary h3 {
  margin: 14px 0 0;
  font-size: clamp(26px, 3vw, 38px);
  letter-spacing: -0.035em;
}

.scenario-boundary article > p:last-child {
  margin: 18px 0 0;
  color: var(--muted);
}

.scenario-result {
  margin: 18px 0 0;
  padding: clamp(24px, 4vw, 38px);
  border: 1px solid var(--line);
  color: var(--muted);
  font-size: clamp(18px, 2vw, 23px);
}

.scenario-result strong {
  color: var(--ink);
}

.boundary-section {
  background: var(--surface);
}

.boundary-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin-top: clamp(42px, 6vw, 68px);
  border: 1px solid var(--line);
}

.boundary-grid article {
  padding: clamp(26px, 4vw, 42px);
}

.boundary-grid article + article {
  border-left: 1px solid var(--line);
}

.boundary-grid .boundary-review {
  background: var(--bg);
  box-shadow: inset 0 3px 0 var(--accent);
}

.boundary-grid h3 {
  margin: 0;
  font-size: 25px;
  letter-spacing: -0.025em;
}

.boundary-grid ul {
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
}

.boundary-grid li {
  padding: 13px 0;
  border-top: 1px solid var(--line);
  color: var(--muted);
}

.contribution-columns {
  display: grid;
  grid-template-columns: 0.85fr 1.3fr 0.85fr;
  margin-top: clamp(42px, 6vw, 68px);
  border: 1px solid var(--line);
}

.contribution-columns article {
  padding: clamp(28px, 4vw, 44px);
}

.contribution-columns article + article {
  border-left: 1px solid var(--line);
}

.contribution-columns .contribution-dan {
  background: var(--surface);
}

.contribution-columns h3 {
  margin: 0;
  font-size: 25px;
}

.contribution-columns p {
  margin: 18px 0 0;
  color: var(--muted);
}

.contribution-columns a {
  display: inline-block;
  margin-top: 24px;
  color: var(--accent);
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 5px;
}

.system-contact {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(320px, 0.8fr);
  gap: 60px;
  align-items: end;
  background: var(--accent-soft);
}

.system-contact .contact-actions {
  justify-content: flex-end;
  margin: 0;
}

@media (max-width: 980px) {
  .system-nav a:not(.nav-contact) {
    display: none;
  }

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

  .system-hero {
    min-height: auto;
  }

  .system-hero-note {
    min-height: 0;
  }

  .layer-stack li {
    grid-template-columns: 52px 1fr;
  }

  .layer-stack li > strong,
  .layer-stack li > p {
    grid-column: 2;
  }

  .proof-flow {
    grid-template-columns: 1fr 1fr;
  }

  .proof-flow figure:last-child {
    grid-column: 1 / -1;
  }

  .boundary-grid,
  .contribution-columns {
    grid-template-columns: 1fr;
  }

  .boundary-grid article + article,
  .contribution-columns article + article {
    border-left: 0;
    border-top: 1px solid var(--line);
  }

  .system-contact .contact-actions {
    justify-content: flex-start;
  }
}

@media (max-width: 720px) {
  .system-header {
    padding-inline: 16px;
  }

  .system-header .wordmark > span:last-child {
    display: none;
  }

  .system-hero {
    gap: 42px;
    padding: 54px 20px 64px;
  }

  .system-hero-copy h1 {
    font-size: clamp(44px, 13vw, 62px);
    line-height: 0.96;
  }

  .system-hero-summary {
    font-size: 19px;
  }

  .system-hero-note {
    padding: 28px;
  }

  .problem-section,
  .layers-section,
  .value-section,
  .proof-section,
  .boundary-section,
  .contribution-section,
  .system-contact {
    padding: 68px 20px;
  }

  .section-copy h2,
  .system-contact h2 {
    font-size: clamp(38px, 11vw, 52px);
  }

  .execution-compare,
  .value-list,
  .proof-flow,
  .verification-record,
  .scenario-request,
  .scenario-flow,
  .scenario-boundary {
    grid-template-columns: 1fr;
  }

  .scenario-request .mono-label {
    grid-column: auto;
  }

  .scenario-flow li {
    min-height: 0;
  }

  .scenario-boundary article + article {
    border-left: 0;
    border-top: 1px solid var(--line);
  }

  .execution-compare article + article,
  .verification-record > div + div {
    border-left: 0;
    border-top: 1px solid var(--line);
  }

  .value-list article,
  .value-list article:nth-child(odd),
  .value-list article:nth-child(even) {
    min-height: 0;
    padding: 30px 0 34px;
    border-right: 0;
  }

  .proof-flow figure:last-child {
    grid-column: auto;
  }

  .proof-image {
    aspect-ratio: 1 / 0.95;
  }

  .system-contact .contact-actions,
  .system-contact .button {
    width: 100%;
  }

  .system-contact .contact-actions {
    display: grid;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
}