:root {
  --bg: #f6f5f1;
  --paper: #ffffff;
  --paper-soft: #fbfaf7;
  --text: #17202a;
  --muted: #5f6b76;
  --line: #d9ded8;
  --line-strong: #c8d0c8;
  --accent: #24415c;
  --accent-soft: #e8eef3;
  --accent-warm: #7b5d3b;
  --max-width: 1080px;
  --content-width: 760px;
  --wide-content-width: 920px;
}

* {
  box-sizing: border-box;
}

html {
  font-size: 17px;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.65;
  color: var(--text);
  background: var(--bg);
  text-rendering: optimizeLegibility;
}

a {
  color: var(--accent);
  text-underline-offset: 0.16em;
}

a:hover {
  text-decoration-thickness: 2px;
}

.skip-link {
  position: absolute;
  left: 1rem;
  top: 0.75rem;
  transform: translateY(-150%);
  background: var(--paper);
  color: var(--accent);
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  padding: 0.35rem 0.75rem;
  font-weight: 650;
  z-index: 1000;
}

.skip-link:focus {
  transform: translateY(0);
}

.site-header {
  background: rgba(255, 255, 255, 0.94);
  border-bottom: 1px solid var(--line);
}

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 1rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}

.site-title {
  font-weight: 750;
  letter-spacing: -0.025em;
  text-decoration: none;
  color: var(--text);
  font-size: 1.02rem;
  white-space: nowrap;
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: flex-end;
  gap: 0.28rem 0.35rem;
  font-size: 0.93rem;
}

.site-nav a {
  text-decoration: none;
  color: var(--muted);
  padding: 0.25rem 0.55rem;
  border-radius: 999px;
}

.site-nav a:hover,
.site-nav a.active {
  color: var(--accent);
  background: var(--accent-soft);
}

.page {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 3rem 1.5rem 4rem;
}

.content {
  max-width: var(--content-width);
}

.content h1 {
  font-size: clamp(2rem, 4vw, 3rem);
  line-height: 1.08;
  letter-spacing: -0.045em;
  margin: 0 0 1.25rem;
}

.content h2 {
  font-size: clamp(1.35rem, 2.5vw, 1.8rem);
  line-height: 1.18;
  letter-spacing: -0.025em;
  margin-top: 2.4rem;
  margin-bottom: 0.7rem;
}

.content h3 {
  font-size: 1.1rem;
  line-height: 1.25;
  margin-top: 1.8rem;
  margin-bottom: 0.5rem;
}

.content p,
.content li {
  color: var(--text);
}

.content p {
  margin: 0 0 1rem;
}

.content ul {
  padding-left: 1.2rem;
}

.content li {
  margin-bottom: 0.45rem;
}

.kicker {
  text-transform: uppercase;
  letter-spacing: 0.13em;
  font-size: 0.74rem;
  color: var(--muted);
  font-weight: 750;
  margin: 0 0 0.85rem;
}

/* Homepage */

.home-hero {
  max-width: var(--wide-content-width);
  padding: 3.3rem 0 2.4rem;
}

.home-hero h1 {
  font-size: clamp(2.25rem, 5.2vw, 3.75rem);
  line-height: 1.04;
  letter-spacing: -0.055em;
  margin: 0 0 1.25rem;
  max-width: 850px;
}

.home-hero .lede {
  font-size: clamp(1.04rem, 1.7vw, 1.24rem);
  line-height: 1.62;
  color: var(--muted);
  max-width: 760px;
  margin-bottom: 0;
}

.current-focus {
  max-width: var(--wide-content-width);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: 1.35rem 0;
  margin: 0 0 2.2rem;
}

.current-focus p {
  max-width: 820px;
  margin: 0;
  font-size: 1.02rem;
  color: var(--text);
}

.grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1rem;
  margin: 2rem 0;
}

.card {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 1.15rem;
  box-shadow: 0 1px 0 rgba(23, 32, 42, 0.03);
}

.card h2,
.card h3 {
  margin-top: 0;
  line-height: 1.18;
  letter-spacing: -0.025em;
}

.card h2 {
  font-size: 1.22rem;
}

.card h3 {
  font-size: 1.08rem;
}

.card p {
  color: var(--muted);
  margin-bottom: 0;
}

.card a {
  text-decoration: none;
}

.card a:hover {
  text-decoration: underline;
}

.home-card {
  min-height: 178px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.card-link {
  display: inline-block;
  margin-top: 1rem;
  font-weight: 650;
  font-size: 0.95rem;
}

.section-title {
  margin-top: 3rem;
  border-top: 1px solid var(--line);
  padding-top: 2rem;
}

.section-title h2 {
  font-size: clamp(1.45rem, 3vw, 2rem);
  letter-spacing: -0.035em;
  line-height: 1.1;
}

.meta,
.status {
  color: var(--muted);
  font-size: 0.9rem;
}

.status {
  display: inline-block;
  background: var(--accent-soft);
  padding: 0.15rem 0.5rem;
  border-radius: 999px;
  margin-bottom: 0.5rem;
}


/* Section gateway cards */

.section-gateway {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
  margin: 1.75rem 0 2.25rem;
}

.gateway-card {
  display: block;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 1.1rem;
  text-decoration: none;
  box-shadow: 0 1px 0 rgba(23, 32, 42, 0.03);
}

.gateway-card:hover {
  border-color: var(--line-strong);
  text-decoration: none;
}

.gateway-card:focus-visible {
  outline: 3px solid var(--accent-soft);
  outline-offset: 3px;
}

.gateway-title {
  display: block;
  color: var(--accent);
  font-weight: 750;
  letter-spacing: -0.015em;
  margin-bottom: 0.35rem;
}

.gateway-text {
  display: block;
  color: var(--muted);
  font-size: 0.95rem;
  line-height: 1.5;
}



/* Public explanation panels */

.example-panel {
  max-width: var(--wide-content-width);
  background: var(--paper-soft);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 1.35rem 1.45rem;
  margin: 0 0 2.2rem;
}

.example-panel h2 {
  font-size: clamp(1.25rem, 2.4vw, 1.7rem);
  line-height: 1.2;
  letter-spacing: -0.03em;
  margin: 0 0 0.65rem;
}

.example-panel p:last-child {
  margin-bottom: 0;
}

.site-footer {
  border-top: 1px solid var(--line);
  background: var(--paper);
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 1.4rem 1.5rem;
  color: var(--muted);
  font-size: 0.9rem;
}

.footer-inner p {
  margin: 0.25rem 0;
}

.footer-rights {
  color: var(--muted);
}

.site-footer a {
  color: var(--accent);
  text-decoration: none;
}

.site-footer a:hover {
  text-decoration: underline;
}

@media (max-width: 900px) {
  html {
    font-size: 16px;
  }

  .header-inner {
    align-items: flex-start;
    flex-direction: column;
    gap: 0.75rem;
  }

  .site-nav {
    width: 100%;
    justify-content: flex-start;
    gap: 0.3rem;
  }

  .grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .home-hero {
    padding-top: 2.5rem;
  }
}

@media (max-width: 560px) {
  .page {
    padding: 2rem 1rem 3rem;
  }

  .header-inner {
    padding: 0.9rem 1rem;
  }

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

  .site-nav a {
    padding: 0.32rem 0.55rem;
  }

  .home-hero h1 {
    font-size: clamp(2rem, 11vw, 2.75rem);
  }

  .home-hero .lede {
    font-size: 1.02rem;
  }

  .current-focus {
    margin-bottom: 1.5rem;
  }
}
/* Notes section */

.notes-intro {
  max-width: var(--content-width);
}

.note-theme {
  margin-top: 3rem;
  border-top: 1px solid var(--line);
  padding-top: 1.75rem;
}

.note-theme h2 {
  font-size: clamp(1.45rem, 3vw, 2rem);
  letter-spacing: -0.035em;
  line-height: 1.1;
  margin: 0 0 0.6rem;
}

.note-theme-description {
  max-width: 760px;
  color: var(--muted);
  margin: 0 0 1.2rem;
}

.note-grid {
  margin-top: 1.2rem;
}

.note-card {
  display: flex;
  flex-direction: column;
}

.note-card h3 {
  margin-bottom: 0.65rem;
}

.note-card .card-link {
  margin-top: auto;
  padding-top: 1rem;
}

.note-label {
  text-transform: uppercase;
  letter-spacing: 0.11em;
  font-size: 0.72rem;
  color: var(--muted);
  font-weight: 750;
  margin: 0 0 0.6rem;
}

.note-lede {
  font-size: 1.05rem;
  color: var(--muted);
  margin-bottom: 1.7rem;
}

.back-link {
  margin-top: 2.5rem;
  font-weight: 650;
}


.note-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1rem;
  color: var(--muted);
  font-size: 0.92rem;
  margin: -0.4rem 0 1.4rem;
}

.content blockquote {
  border-left: 4px solid var(--accent);
  color: var(--muted);
  font-style: italic;
  margin: 1.6rem 0;
  padding: 0.25rem 0 0.25rem 1rem;
}

.content blockquote p {
  margin: 0;
}

@media (max-width: 760px) {
  .section-gateway {
    grid-template-columns: 1fr;
  }
}


/* Appearance patch v0.1: restrained public-systems editorial layer */

.concept-panel {
  max-width: var(--wide-content-width);
  display: grid;
  grid-template-columns: minmax(0, 0.82fr) minmax(320px, 1fr);
  gap: 1.4rem;
  align-items: center;
  background: linear-gradient(135deg, var(--paper) 0%, var(--paper-soft) 100%);
  border: 1px solid var(--line);
  border-radius: 22px;
  padding: clamp(1.15rem, 2.4vw, 1.65rem);
  margin: 0 0 2.2rem;
  box-shadow: 0 16px 36px rgba(23, 32, 42, 0.05);
}

.concept-copy h2 {
  font-size: clamp(1.45rem, 3vw, 2.1rem);
  line-height: 1.1;
  letter-spacing: -0.04em;
  margin: 0 0 0.7rem;
}

.concept-copy p:last-child {
  margin-bottom: 0;
}

.route-sketch {
  margin: 0;
  background: rgba(232, 238, 243, 0.48);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 0.55rem 0.55rem 0.75rem;
}

.route-sketch svg {
  display: block;
  width: 100%;
  height: auto;
}

.route-sketch figcaption {
  max-width: 34rem;
  margin: 0.45rem auto 0;
  color: var(--muted);
  font-size: 0.86rem;
  line-height: 1.45;
  text-align: center;
}

.route-node {
  fill: #ffffff;
  stroke: var(--line-strong);
  stroke-width: 2;
}

.route-node-system {
  fill: var(--paper-soft);
  stroke: var(--accent);
}

.route-node-repair {
  fill: #fffaf1;
  stroke: var(--accent-warm);
}

.route-node-entry,
.route-node-outcome {
  fill: #ffffff;
}

.route-line {
  fill: none;
  stroke: var(--accent);
  stroke-width: 3;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.route-line-repair {
  stroke: var(--accent-warm);
}

.route-arrow-head {
  fill: var(--accent);
}

.route-arrow-head-warm {
  fill: var(--accent-warm);
}

.route-label {
  fill: var(--text);
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 18px;
}

.route-label-strong {
  font-weight: 720;
}

.card,
.gateway-card {
  transition: border-color 160ms ease, box-shadow 160ms ease, transform 160ms ease;
}

.card:hover,
.gateway-card:hover {
  border-color: var(--line-strong);
  box-shadow: 0 10px 24px rgba(23, 32, 42, 0.06);
  transform: translateY(-1px);
}

.card:focus-within,
.gateway-card:focus-within {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(36, 65, 92, 0.12);
}

.note-card {
  border-top: 4px solid var(--accent-soft);
}

.note-card:hover,
.note-card:focus-within {
  border-top-color: var(--accent);
}

.note-label,
.meta,
.status,
.note-meta,
.note-theme-description,
.gateway-text,
.card p,
.route-sketch figcaption {
  color: #4f5d68;
}

.note-single h2 {
  border-top: 1px solid var(--line);
  padding-top: 1.1rem;
  margin-top: 2.8rem;
}

.note-single h2:first-of-type {
  margin-top: 2.4rem;
}

:focus-visible {
  outline: 3px solid rgba(36, 65, 92, 0.34);
  outline-offset: 3px;
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    transition-duration: 0.001ms !important;
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
  }
}

@media (max-width: 760px) {
  .concept-panel {
    grid-template-columns: 1fr;
  }

  .route-sketch {
    padding: 0.35rem 0.35rem 0.65rem;
  }
}

@media (max-width: 560px) {
  .concept-panel {
    border-radius: 18px;
  }

  .route-sketch figcaption {
    text-align: left;
  }
}