:root {
  color-scheme: light;
  --site-grid-minor: rgba(182, 176, 160, 0.10);
  --site-grid-major: rgba(182, 176, 160, 0.18);
  --site-surface: var(--gp-paper);
  --site-surface-raised: var(--gp-paper-deep);
  --site-stamp-bg: var(--gp-paper);
}

[data-theme="dark"] {
  color-scheme: dark;
  --site-grid-minor: rgba(217, 211, 194, 0.04);
  --site-grid-major: rgba(217, 211, 194, 0.08);
  --site-surface: var(--gp-paper);
  --site-surface-raised: var(--gp-paper-deep);
  --site-stamp-bg: var(--gp-paper);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
}

body {
  color: var(--gp-ink);
  font-family: var(--gp-font-sans);
  -webkit-font-smoothing: antialiased;
}

body.gp-bg-grid {
  background-color: var(--gp-paper);
  background-image:
    linear-gradient(to right, var(--site-grid-minor) 1px, transparent 1px),
    linear-gradient(to bottom, var(--site-grid-minor) 1px, transparent 1px),
    linear-gradient(to right, var(--site-grid-major) 1px, transparent 1px),
    linear-gradient(to bottom, var(--site-grid-major) 1px, transparent 1px);
}

a {
  color: inherit;
}

button,
input {
  font: inherit;
}

button:focus-visible,
a:focus-visible,
input:focus-visible {
  outline: 2px solid var(--gp-mark);
  outline-offset: 2px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 30;
  background: var(--gp-paper);
  border-bottom: 1px solid var(--gp-ink);
}

.site-header-inner {
  align-items: center;
  display: flex;
  gap: 28px;
  min-height: 72px;
  padding: 16px 56px;
}

.brand {
  align-items: center;
  display: flex;
  gap: 12px;
  text-decoration: none;
}

.kf-mark {
  display: block;
  height: 28px;
  width: 28px;
}

.brand-text {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.brand-name {
  font-size: 20px;
  font-weight: 500;
  letter-spacing: -0.01em;
  line-height: 1;
}

.brand-subline,
.site-nav a,
.theme-toggle button,
.footer-meta,
.mono-eyebrow,
.stamp {
  font-family: var(--gp-font-mono);
}

.brand-subline {
  color: var(--gp-graphite);
  font-size: 10px;
  letter-spacing: 0.18em;
  line-height: 1;
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 28px;
  margin-left: 56px;
  row-gap: 8px;
}

.site-nav a {
  border-bottom: 1.5px solid transparent;
  font-size: 11px;
  letter-spacing: 0.16em;
  padding-bottom: 3px;
  text-decoration: none;
  text-transform: uppercase;
}

.site-nav a.is-active {
  border-bottom-color: var(--gp-mark);
}

.header-actions {
  align-items: center;
  display: flex;
  gap: 12px;
  margin-left: auto;
}

.theme-toggle {
  background: var(--gp-paper);
  border: 1px solid var(--gp-rule);
  display: inline-flex;
}

.theme-toggle button {
  background: transparent;
  border: 0;
  color: var(--gp-ink);
  cursor: pointer;
  font-size: 10px;
  letter-spacing: 0.18em;
  padding: 8px 12px;
}

.theme-toggle button + button {
  border-left: 1px solid var(--gp-rule);
}

[data-theme="light"] .theme-toggle button[data-theme-choice="light"],
[data-theme="dark"] .theme-toggle button[data-theme-choice="dark"] {
  background: var(--gp-ink);
  color: var(--gp-paper);
}

.site-main {
  min-height: calc(100vh - 220px);
  padding: 0 56px;
}

.masthead {
  padding: 88px 0 56px;
}

.masthead h1 {
  color: var(--gp-ink);
  font-size: clamp(56px, 11vw, 120px);
  font-weight: 500;
  letter-spacing: -0.025em;
  line-height: 0.95;
  margin: 32px 0 0;
  text-wrap: pretty;
}

.masthead p {
  color: var(--gp-ink-soft);
  font-size: 22px;
  line-height: 1.5;
  margin: 32px 0 0;
  max-width: 760px;
}

.section-rule {
  align-items: center;
  border-bottom: 1px solid var(--gp-ink);
  display: flex;
  gap: 14px;
  padding-bottom: 12px;
}

.section-rule > span:not(.mono-eyebrow) {
  background: var(--gp-rule);
  flex: 1;
  height: 1px;
}

.mono-eyebrow {
  color: var(--gp-graphite);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.section-head {
  margin-bottom: 32px;
}

.section-head h2 {
  color: var(--gp-ink);
  font-size: clamp(36px, 6vw, 56px);
  font-weight: 500;
  letter-spacing: -0.02em;
  line-height: 1.05;
  margin: 20px 0 0;
  max-width: 1000px;
  text-wrap: pretty;
}

.section-head p {
  color: var(--gp-ink-soft);
  font-size: 17px;
  line-height: 1.5;
  margin: 14px 0 0;
  max-width: 760px;
}

.stamp {
  align-items: center;
  background: var(--site-stamp-bg);
  border: 1px solid var(--gp-ink);
  border-radius: 2px;
  display: inline-flex;
  font-size: 10px;
  font-weight: 500;
  gap: 6px;
  letter-spacing: 0.14em;
  line-height: 1;
  padding: 4px 8px;
  text-transform: uppercase;
  white-space: nowrap;
}

.stamp-row {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.stamp-filled {
  background: var(--gp-ink);
  color: var(--gp-paper);
}

.stamp-mark {
  border-color: var(--gp-mark);
  color: var(--gp-mark);
}

.stamp-mute {
  border-color: var(--gp-rule);
  color: var(--gp-graphite);
}

.in-flight {
  padding: 24px 0 88px;
}

.list-table {
  border-top: 1px solid var(--gp-rule);
  background: var(--site-surface);
}

.list-row {
  align-items: center;
  background: var(--site-surface);
  border-bottom: 1px solid var(--gp-rule);
  display: grid;
  gap: 32px;
  grid-template-columns: 180px 1fr 220px 24px;
  padding: 24px 16px;
  text-decoration: none;
}

.list-row:hover {
  background: var(--site-surface-raised);
}

.list-row strong {
  font-size: 28px;
  font-weight: 500;
  letter-spacing: -0.015em;
}

.list-row span:not(.stamp) {
  color: var(--gp-graphite);
  font-family: var(--gp-font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-align: right;
}

.list-row em {
  font-style: normal;
  text-align: right;
}

.page-intro {
  padding: 56px 0 32px;
}

.breadcrumb {
  align-items: center;
  border-bottom: 1px solid var(--gp-rule-soft);
  color: var(--gp-graphite);
  display: flex;
  flex-wrap: wrap;
  font-family: var(--gp-font-mono);
  font-size: 11px;
  gap: 12px;
  letter-spacing: 0.12em;
  padding: 14px 0;
  text-transform: uppercase;
}

.breadcrumb a {
  text-decoration: none;
}

.breadcrumb a,
.breadcrumb span,
.breadcrumb b {
  flex: 0 0 auto;
  white-space: nowrap;
}

.breadcrumb span {
  color: var(--gp-ink);
}

.project-grid {
  display: grid;
  gap: 24px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  padding: 0 0 80px;
}

.project-card,
.artifact-card {
  background: var(--site-surface);
  border: 1px solid var(--gp-rule);
  color: var(--gp-ink);
  position: relative;
  text-decoration: none;
}

.project-card {
  display: block;
  padding: 40px 28px 24px;
  text-decoration: none;
}

.project-card:hover {
  border-color: var(--gp-ink);
  box-shadow: 4px 4px 0 var(--gp-mark);
}

.card-corner-left,
.card-corner-right {
  color: var(--gp-graphite);
  font-family: var(--gp-font-mono);
  font-size: 10px;
  letter-spacing: 0.16em;
  position: absolute;
  text-transform: uppercase;
  top: 14px;
}

.card-corner-left {
  left: 18px;
}

.card-corner-right {
  right: 18px;
}

.project-card h3,
.artifact-card h3 {
  color: var(--gp-ink);
  font-weight: 500;
  letter-spacing: -0.02em;
  line-height: 1.05;
  margin: 0;
}

.project-card h3 {
  font-size: 36px;
}

.project-card p,
.artifact-card p {
  color: var(--gp-ink-soft);
  line-height: 1.55;
}

.card-footer {
  align-items: center;
  border-top: 1px solid var(--gp-rule-soft);
  color: var(--gp-graphite);
  display: flex;
  font-family: var(--gp-font-mono);
  font-size: 10px;
  justify-content: space-between;
  letter-spacing: 0.14em;
  margin-top: 28px;
  padding-top: 14px;
}

.project-header {
  align-items: start;
  border-bottom: 1px solid var(--gp-rule);
  display: grid;
  gap: 36px;
  grid-template-columns: 1fr 300px;
  padding: 32px 0 28px;
}

.project-header h1 {
  font-size: clamp(48px, 8vw, 88px);
  font-weight: 500;
  letter-spacing: -0.025em;
  line-height: 1;
  margin: 20px 0 0;
  text-wrap: pretty;
}

.project-header p {
  color: var(--gp-ink-soft);
  font-size: 20px;
  line-height: 1.5;
  margin: 20px 0 0;
  max-width: 720px;
}

.metadata-panel {
  background: var(--site-surface-raised);
  border: 1px solid var(--gp-rule);
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 16px 18px;
}

.metadata-panel div {
  border-top: 1px solid var(--gp-rule-soft);
  display: flex;
  font-family: var(--gp-font-mono);
  font-size: 12px;
  justify-content: space-between;
  padding-top: 8px;
}

.metadata-panel span {
  color: var(--gp-graphite);
  letter-spacing: 0.12em;
}

.metadata-panel strong {
  color: var(--gp-ink);
  font-weight: 500;
  text-align: right;
}

.artifact-section {
  padding: 48px 0 0;
}

.artifact-grid {
  display: grid;
  gap: 20px;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.artifact-card {
  display: flex;
  flex-direction: column;
  min-height: 240px;
  padding: 36px 22px 18px;
}

.artifact-card:hover {
  border-color: var(--gp-ink);
  box-shadow: 3px 3px 0 var(--gp-rule);
}

.artifact-card h3 {
  font-size: 24px;
}

.artifact-card p {
  font-size: 14px;
  margin: 12px 0 0;
}

.artifact-spacer {
  flex: 1;
}

.margin-notes {
  padding: 64px 0 24px;
}

.reader-page {
  padding: 32px 0 48px;
}

.reader-header {
  align-items: start;
  border-bottom: 1px solid var(--gp-rule);
  display: grid;
  gap: 36px;
  grid-template-columns: 1fr 320px;
  padding: 32px 0 28px;
}

.reader-header h1 {
  font-size: clamp(42px, 7vw, 76px);
  font-weight: 500;
  letter-spacing: -0.025em;
  line-height: 1;
  margin: 20px 0 0;
  text-wrap: pretty;
}

.reader-header p {
  color: var(--gp-ink-soft);
  font-size: 19px;
  line-height: 1.5;
  margin: 20px 0 0;
  max-width: 760px;
}

.reader-panel {
  background: var(--site-surface);
  border: 1px solid var(--gp-rule);
  margin-top: 32px;
  padding: clamp(24px, 5vw, 56px);
}

.reader-content {
  max-width: 840px;
}

.story-chapter {
  font-family: Georgia, "Times New Roman", serif;
  font-size: 19px;
  line-height: 1.76;
}

.story-chapter p {
  margin: 0 0 1.08em;
}

.story-chapter .start::first-letter,
.story-chapter p:first-child::first-letter {
  color: var(--gp-mark);
  float: left;
  font-size: 4.4rem;
  line-height: 0.82;
  padding: 0.08em 0.12em 0 0;
}

.markdown-body {
  color: var(--gp-ink-soft);
  font-size: 17px;
  line-height: 1.65;
}

.markdown-body h2,
.markdown-body h3,
.markdown-body h4 {
  color: var(--gp-ink);
  font-weight: 500;
  letter-spacing: -0.015em;
  line-height: 1.12;
  margin: 1.6em 0 0.55em;
}

.markdown-body h2 {
  font-size: 32px;
}

.markdown-body h3,
.markdown-body h4 {
  font-size: 24px;
}

.markdown-body p {
  margin: 0 0 1.05em;
}

.markdown-body ul {
  margin: 0 0 1.2em;
  padding-left: 1.3em;
}

.markdown-body li + li {
  margin-top: 0.4em;
}

.markdown-body code {
  background: var(--site-surface-raised);
  border: 1px solid var(--gp-rule-soft);
  color: var(--gp-ink);
  font-family: var(--gp-font-mono);
  font-size: 0.88em;
  padding: 0.08em 0.28em;
}

.reader-nav {
  align-items: center;
  background: var(--site-surface);
  border: 1px solid var(--gp-rule);
  display: grid;
  font-family: var(--gp-font-mono);
  font-size: 11px;
  gap: 16px;
  grid-template-columns: 1fr auto 1fr;
  letter-spacing: 0.12em;
  margin-top: 18px;
  padding: 14px 16px;
  text-transform: uppercase;
}

.reader-nav a {
  text-decoration: none;
}

.reader-nav span:last-child {
  text-align: right;
}

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

.margin-note {
  border-bottom: 1px solid var(--gp-rule-soft);
  display: grid;
  gap: 24px;
  grid-template-columns: 160px 1fr;
  padding: 18px 0;
}

.margin-note strong {
  display: block;
  font-size: 15px;
  font-weight: 500;
}

.margin-note span {
  color: var(--gp-graphite);
  display: block;
  font-family: var(--gp-font-mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  margin-top: 4px;
}

.margin-note p {
  color: var(--gp-ink-soft);
  font-size: 15px;
  line-height: 1.55;
  margin: 0;
}

.note-form {
  display: flex;
  gap: 10px;
  margin-top: 18px;
}

.note-form input {
  background: var(--gp-paper);
  border: 1px solid var(--gp-rule);
  color: var(--gp-ink);
  flex: 1;
  padding: 12px 14px;
}

.note-form button {
  background: var(--gp-ink);
  border: 1.5px solid var(--gp-ink);
  color: var(--gp-paper);
  padding: 12px 18px;
}

.note-form input:disabled,
.note-form button:disabled {
  cursor: not-allowed;
  opacity: 0.65;
}

.note-index {
  background: var(--site-surface);
  border-top: 1px solid var(--gp-rule);
  padding: 0 0 64px;
}

.note-index-row {
  align-items: center;
  background: var(--site-surface);
  border-bottom: 1px solid var(--gp-rule);
  color: var(--gp-ink);
  display: grid;
  gap: 28px;
  grid-template-columns: 60px 1fr 160px;
  padding: 24px 16px;
  text-decoration: none;
}

.note-index-row:hover {
  background: var(--site-surface-raised);
}

.note-index-row > span,
.note-index-row time {
  color: var(--gp-graphite);
  font-family: var(--gp-font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
}

.note-index-row time {
  text-align: right;
}

.note-index-row h3 {
  font-size: 24px;
  font-weight: 500;
  letter-spacing: -0.015em;
  margin: 0;
}

.note-index-row p {
  color: var(--gp-ink-soft);
  font-size: 14px;
  line-height: 1.5;
  margin: 6px 0 0;
  max-width: 760px;
}

.agentops-grid {
  align-items: start;
  display: grid;
  gap: 56px;
  grid-template-columns: 2fr 1fr;
  padding: 0 0 32px;
}

.agentops-copy {
  margin-top: 0;
}

.principle-list {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.principle-list article {
  border-top: 1px solid var(--gp-rule-soft);
  display: grid;
  gap: 20px;
  grid-template-columns: 60px 1fr;
  padding-top: 18px;
}

.principle-list article > span {
  color: var(--gp-graphite);
  font-family: var(--gp-font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
}

.principle-list h3 {
  font-size: 28px;
  font-weight: 500;
  letter-spacing: -0.015em;
  margin: 0;
}

.principle-list p {
  color: var(--gp-ink-soft);
  font-size: 16px;
  line-height: 1.55;
  margin: 10px 0 0;
}

.site-footer {
  background: var(--site-surface-raised);
  border-top: 1px solid var(--gp-ink);
  margin-top: 64px;
  padding: 32px 56px 40px;
}

.site-footer p {
  color: var(--gp-ink-soft);
  font-size: 15px;
  line-height: 1.55;
  margin: 20px 0 0;
  max-width: 920px;
}

.footer-meta {
  align-items: center;
  color: var(--gp-graphite);
  display: flex;
  flex-wrap: wrap;
  font-size: 10px;
  gap: 14px;
  justify-content: space-between;
  letter-spacing: 0.16em;
  margin-top: 24px;
}

.footer-links {
  display: flex;
  gap: 18px;
}

.footer-links a {
  text-decoration: none;
}

@media (max-width: 980px) {
  .site-header-inner,
  .site-main,
  .site-footer {
    padding-left: 24px;
    padding-right: 24px;
  }

  .site-header-inner {
    align-items: flex-start;
    flex-direction: column;
  }

  .site-nav {
    margin-left: 0;
  }

  .header-actions {
    margin-left: 0;
  }

  .breadcrumb {
    font-size: 10px;
    gap: 8px;
    letter-spacing: 0.1em;
  }

  .list-row,
  .project-header,
  .reader-header,
  .agentops-grid,
  .margin-note,
  .note-index-row {
    grid-template-columns: 1fr;
  }

  .reader-nav {
    align-items: start;
    grid-template-columns: 1fr;
  }

  .reader-nav span:last-child {
    text-align: left;
  }

  .list-row span:not(.stamp),
  .note-index-row time {
    text-align: left;
  }

  .project-grid,
  .artifact-grid {
    grid-template-columns: 1fr;
  }
}