/* ============================================================
   Contract Graph — contractgraph.dev
   Plain CSS, mobile-first. Palette shared with Sarada; type is IBM Plex.
   ============================================================ */

:root,
[data-theme="dark"] {
  --ink: #EAF6F7;
  --teal: #3ECFBF;
  --teal-soft: #8BB8C4;
  --accent: #11B7A5;
  --blue: #7AA3F5;

  --bg: #07131F;
  --surface: #0C1F30;

  --text: #D7E7EE;
  --text-muted: #9BB4C0;
  --border: rgba(186, 216, 224, 0.14);

  --header-bg: rgba(7, 19, 31, 0.88);
  --header-shadow: 0 8px 30px rgba(0, 0, 0, 0.28);
  --nav-bg: rgba(12, 31, 48, 0.98);
  --nav-shadow: 0 16px 40px rgba(0, 0, 0, 0.35);
  --nav-hover: rgba(17, 183, 165, 0.12);
  --nav-current: rgba(17, 183, 165, 0.18);

  --card-bg: rgba(12, 31, 48, 0.94);
  --card-shadow: 0 18px 50px rgba(0, 0, 0, 0.28);

  --code-bg: #050B14;
  --code-fg: #EFFBFB;
  --inline-code-bg: rgba(17, 183, 165, 0.14);

  --button-bg: #11B7A5;
  --button-fg: #061422;
  --button-border: #11B7A5;
  --button-hover-bg: #2ED3C0;
  --button-hover-border: #2ED3C0;
  --button-secondary-bg: transparent;
  --button-secondary-fg: var(--ink);
  --button-secondary-border: rgba(186, 216, 224, 0.28);
  --button-secondary-hover-bg: rgba(234, 246, 247, 0.06);

  --section-tint: rgba(17, 183, 165, 0.06);
  --callout-bg: rgba(17, 183, 165, 0.1);
  --principle-bg: rgba(17, 183, 165, 0.08);
  --warn-border: #E2A84B;
  --warn-bg: rgba(226, 168, 75, 0.12);
  --glow-teal: rgba(17, 183, 165, 0.18);
  --glow-blue: rgba(47, 111, 232, 0.16);
  --link-line: rgba(62, 207, 191, 0.38);

  --footer-from: #040D16;
  --footer-to: #061824;
  --footer-text: #EAF6F7;
  --footer-muted: #AFC7CE;
  --footer-link: #C5DCE1;
  --footer-rule: rgba(234, 246, 247, 0.14);

  --diagram-bg: #F4F7F8;

  --radius: 18px;
  --container: 70rem;
  --header-h: 4.15rem;
}

[data-theme="light"] {
  --ink: #082844;
  --teal: #077B87;
  --teal-soft: #397389;
  --accent: #11B7A5;
  --blue: #2F6FE8;

  --bg: #F4F7F8;
  --surface: #FFFFFF;

  --text: #102F49;
  --text-muted: #466579;
  --border: rgba(8, 40, 68, 0.13);

  --header-bg: rgba(255, 255, 255, 0.92);
  --header-shadow: 0 8px 30px rgba(8, 40, 68, 0.035);
  --nav-bg: rgba(255, 255, 255, 0.98);
  --nav-shadow: 0 16px 40px rgba(8, 40, 68, 0.12);
  --nav-hover: rgba(7, 123, 135, 0.08);
  --nav-current: rgba(17, 183, 165, 0.12);

  --card-bg: rgba(255, 255, 255, 0.94);
  --card-shadow: 0 18px 50px rgba(8, 40, 68, 0.08);

  --code-bg: #082844;
  --code-fg: #EFFBFB;
  --inline-code-bg: rgba(7, 123, 135, 0.08);

  --button-bg: #082844;
  --button-fg: #fff;
  --button-border: #082844;
  --button-hover-bg: #077B87;
  --button-hover-border: #077B87;
  --button-secondary-bg: transparent;
  --button-secondary-fg: #082844;
  --button-secondary-border: rgba(8, 40, 68, 0.3);
  --button-secondary-hover-bg: #fff;

  --section-tint: rgba(7, 123, 135, 0.035);
  --callout-bg: rgba(17, 183, 165, 0.09);
  --principle-bg: rgba(255, 255, 255, 0.65);
  --warn-border: #E2A84B;
  --warn-bg: rgba(226, 168, 75, 0.11);
  --glow-teal: rgba(17, 183, 165, 0.16);
  --glow-blue: rgba(47, 111, 232, 0.1);
  --link-line: rgba(7, 123, 135, 0.3);

  --footer-from: #082844;
  --footer-to: #061B2E;
  --footer-text: #EAF6F7;
  --footer-muted: #AFC7CE;
  --footer-link: #C5DCE1;
  --footer-rule: rgba(234, 246, 247, 0.15);

  --diagram-bg: #FFFFFF;
  color-scheme: light;
}

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

html {
  scroll-behavior: smooth;
  overflow-x: clip;
  color-scheme: dark;
  background: var(--bg);
}

body {
  margin: 0;
  overflow-x: clip;
  font-family: "IBM Plex Sans", system-ui, -apple-system, "Segoe UI", Helvetica, Arial, sans-serif;
  font-size: 1.0625rem;
  line-height: 1.7;
  overflow-wrap: break-word;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

img, svg, video, iframe { max-width: 100%; height: auto; display: block; }

h1, h2, h3 {
  line-height: 1.15;
  letter-spacing: -0.02em;
  font-weight: 600;
  margin: 0;
}

p { margin: 0; }

a {
  color: var(--teal);
  text-decoration: none;
}

:focus-visible {
  outline: 2px solid var(--teal);
  outline-offset: 3px;
  border-radius: 2px;
}

.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: clamp(1rem, 4.5vw, 2.5rem);
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: absolute;
  left: 1rem;
  top: -3rem;
  z-index: 20;
  padding: 0.5rem 1rem;
  background: var(--button-bg);
  color: var(--button-fg);
  border-radius: 0 0 8px 8px;
  transition: top 0.2s ease;
}
.skip-link:focus { top: 0; }

code, kbd, pre, .code-title {
  font-family: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
}

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 8;
  padding-block: 0.7rem;
  border-bottom: 1px solid var(--border);
  background: var(--header-bg);
  box-shadow: var(--header-shadow);
  backdrop-filter: blur(14px);
}

.header-inner {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  min-width: 0;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  color: var(--ink);
  min-width: 0;
}

.brand-mark {
  width: 2rem;
  height: 2rem;
  flex: 0 0 auto;
}

.brand-name {
  font-size: 1.02rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  white-space: nowrap;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  margin-left: auto;
}

.theme-toggle,
.nav-toggle {
  display: inline-grid;
  width: 2.55rem;
  height: 2.55rem;
  flex: 0 0 auto;
  place-items: center;
  padding: 0;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--surface);
  color: var(--ink);
  cursor: pointer;
}

.theme-icon {
  width: 1.15rem;
  height: 1.15rem;
}

[data-theme="dark"] .theme-icon-moon,
[data-theme="light"] .theme-icon-sun { display: none; }

.nav-toggle-bars,
.nav-toggle-bars::before,
.nav-toggle-bars::after {
  display: block;
  width: 1.15rem;
  height: 2.5px;
  border-radius: 1px;
  background: var(--ink);
  transform-origin: center;
  transition: transform 0.2s ease, opacity 0.2s ease, background 0.2s ease;
}

.nav-toggle-bars { position: relative; }
.nav-toggle-bars::before,
.nav-toggle-bars::after {
  content: "";
  position: absolute;
  inset-inline: 0;
  top: 0;
}
.nav-toggle-bars::before { transform: translateY(-7px); }
.nav-toggle-bars::after { transform: translateY(7px); }

.nav-toggle[aria-expanded="true"] .nav-toggle-bars {
  background: transparent;
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::before {
  transform: rotate(45deg);
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::after {
  transform: rotate(-45deg);
}

.site-header nav {
  display: none;
  position: absolute;
  top: calc(100% + 0.55rem);
  left: 0;
  right: 0;
  z-index: 9;
  flex-direction: column;
  gap: 0.15rem;
  padding: 0.55rem;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: var(--nav-bg);
  box-shadow: var(--nav-shadow);
}

.site-header nav.is-open { display: flex; }

.site-header nav a {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-muted);
  padding: 0.7rem 0.85rem;
  border-radius: 10px;
}

.site-header nav a:hover {
  color: var(--ink);
  background: var(--nav-hover);
}

.site-header nav a[aria-current="page"] {
  color: var(--ink);
  background: var(--nav-current);
}

/* ---------- Sections ---------- */
section { padding-block: clamp(3.5rem, 8vw, 5.75rem); }

h2 {
  font-size: clamp(1.5rem, 3vw, 1.95rem);
  color: var(--ink);
}

.eyebrow,
.status-label {
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--teal-soft);
}

.eyebrow { margin-bottom: 1.1rem; }
.status-label { margin-bottom: 1rem; }

/* ---------- Buttons ---------- */
.page-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.75rem;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.85rem;
  padding: 0.65rem 1.05rem;
  border: 1px solid var(--button-border);
  border-radius: 999px;
  background: var(--button-bg);
  color: var(--button-fg);
  font-size: 0.93rem;
  font-weight: 600;
  transition: background 0.2s ease, border-color 0.2s ease, color 0.2s ease;
}

.button:hover {
  background: var(--button-hover-bg);
  border-color: var(--button-hover-border);
}

.button-secondary {
  background: var(--button-secondary-bg);
  color: var(--button-secondary-fg);
  border-color: var(--button-secondary-border);
}

.button-secondary:hover {
  background: var(--button-secondary-hover-bg);
  color: var(--ink);
  border-color: var(--accent);
}

/* ---------- Home hero ---------- */
.home-hero {
  padding-block: clamp(2.4rem, 6vw, 4.2rem) clamp(2.8rem, 6vw, 4.5rem);
  overflow: hidden;
  background:
    radial-gradient(42rem 28rem at 92% 0%, var(--glow-teal), transparent 68%),
    radial-gradient(34rem 25rem at 104% 92%, var(--glow-blue), transparent 70%);
}

.home-hero-layout {
  display: grid;
  gap: clamp(2rem, 5vw, 3.5rem);
  align-items: start;
}

.home-hero-layout > * { min-width: 0; }

.home-hero h1 {
  max-width: 16ch;
  font-size: clamp(1.85rem, 7vw, 3.55rem);
  color: var(--ink);
}

.page-lede,
.home-hero .lede {
  max-width: 40rem;
  margin-top: 1.25rem;
  color: var(--text-muted);
  font-size: clamp(1rem, 2.6vw, 1.28rem);
}

.beta-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.7rem;
  margin-bottom: 1.1rem;
}

.beta-badge {
  display: inline-flex;
  padding: 0.22rem 0.55rem;
  border: 1px solid var(--link-line);
  border-radius: 999px;
  background: var(--callout-bg);
  color: var(--teal);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.path-grid {
  display: grid;
  gap: 1rem;
}

.path-card {
  display: flex;
  flex-direction: column;
  padding: 1.45rem 1.5rem 1.5rem;
  border: 1px solid var(--border);
  border-top: 3px solid var(--accent);
  border-radius: var(--radius);
  background: var(--card-bg);
  box-shadow: var(--card-shadow);
}

.path-card.developers { border-top-color: var(--blue); }

.path-card h2 {
  font-size: 1.25rem;
}

.path-card p {
  margin-top: 0.65rem;
  color: var(--text-muted);
  font-size: 0.95rem;
}

.path-card .page-actions { margin-top: auto; padding-top: 1.2rem; }

/* ---------- Quick start / video ---------- */
.quick-start-card {
  scroll-margin-top: 5.5rem;
  overflow: hidden;
  border: 1px solid var(--border);
  border-top: 3px solid var(--accent);
  border-radius: var(--radius);
  background: var(--card-bg);
  box-shadow: var(--card-shadow);
}

.quick-start-wide { display: grid; }

.quick-start-intro {
  min-width: 0;
  padding: clamp(1.4rem, 4vw, 2rem);
  background: linear-gradient(145deg, var(--glow-teal), var(--glow-blue));
}

.quick-start-intro .status-label { margin-bottom: 0.55rem; }
.quick-start-intro h2 { font-size: clamp(1.35rem, 3vw, 1.8rem); }
.quick-start-intro > p:not(.status-label) { margin-top: 0.8rem; color: var(--text-muted); font-size: 0.95rem; }
.quick-start-commands { min-width: 0; background: var(--surface); }

.hero-video-trigger {
  position: relative;
  display: block;
  width: 100%;
  margin-top: 1.25rem;
  padding: 0;
  overflow: hidden;
  border: 0;
  border-radius: var(--radius);
  background: #050812;
  box-shadow: 0 14px 36px rgba(8, 40, 68, 0.18);
  cursor: pointer;
}

.hero-video-trigger img {
  display: block;
  width: 100%;
  height: auto;
  transition: transform 0.35s ease, opacity 0.35s ease;
}

.hero-video-trigger::after {
  content: "";
  position: absolute;
  inset: 0;
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: inherit;
  background: linear-gradient(180deg, transparent 48%, rgba(5, 8, 18, 0.78));
  transition: border-color 0.2s ease;
}

.hero-video-trigger:hover img { transform: scale(1.018); opacity: 0.93; }
.hero-video-trigger:hover::after { border-color: rgba(17, 183, 165, 0.82); }

.hero-video-play {
  position: absolute;
  left: 50%;
  top: 50%;
  z-index: 2;
  display: grid;
  width: clamp(3.4rem, 7vw, 4.6rem);
  aspect-ratio: 1;
  place-items: center;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.94);
  box-shadow: 0 10px 30px rgba(5, 8, 18, 0.3);
  color: #082844;
  transform: translate(-50%, -50%);
}

.hero-video-play span { margin-left: 0.2em; font-size: clamp(1rem, 2vw, 1.35rem); }

.hero-video-label {
  position: absolute;
  left: 1.15rem;
  bottom: 0.95rem;
  z-index: 2;
  color: #fff;
  font-size: 0.82rem;
  font-weight: 600;
}

.quick-start-heading {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.4rem 1.5rem 1.1rem;
}

.quick-start-heading .status-label { margin-bottom: 0.55rem; }
.quick-start-heading h2 { font-size: clamp(1.2rem, 2vw, 1.45rem); }

.quick-start-tabs {
  display: flex;
  gap: 0.35rem;
  padding: 0 1.5rem;
  border-bottom: 1px solid var(--border);
}

.quick-start-tabs button {
  appearance: none;
  margin-bottom: -1px;
  padding: 0.65rem 0.9rem;
  border: 0;
  border-bottom: 2px solid transparent;
  background: transparent;
  color: var(--text-muted);
  font: inherit;
  font-size: 0.86rem;
  font-weight: 600;
  cursor: pointer;
}

.quick-start-tabs button[aria-selected="true"] {
  border-bottom-color: var(--accent);
  color: var(--ink);
}

.quick-start-panel { padding: 1.2rem 1.5rem 1.4rem; }
.quick-start-panel[hidden] { display: none; }
.quick-start-panel > p:first-child { color: var(--text-muted); font-size: 0.91rem; }

.quick-start-panel pre,
.yaml-card pre {
  margin: 1rem 0 0;
  padding: 1.1rem 1.2rem;
  overflow-x: auto;
  max-width: 100%;
  border-radius: 10px;
  background: var(--code-bg);
  color: var(--code-fg);
  font-size: 0.82rem;
  line-height: 1.65;
  font-weight: 500;
}

.quick-start-panel pre code,
.yaml-card pre code { color: inherit; }

.code-block {
  position: relative;
  margin-top: 1rem;
}

.code-block pre { margin-top: 0; padding-right: 4.5rem; }

.copy-btn {
  position: absolute;
  top: 0.7rem;
  right: 0.7rem;
  padding: 0.28rem 0.55rem;
  border: 1px solid rgba(255, 255, 255, 0.22);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.08);
  color: #D7EEF1;
  font: inherit;
  font-size: 0.72rem;
  font-weight: 600;
  cursor: pointer;
}

.copy-btn:hover { background: rgba(17, 183, 165, 0.22); }

.quick-start-note {
  margin-top: 0.9rem;
  color: var(--text-muted);
  font-size: 0.81rem;
}

.quick-start-note code,
.workflow-steps code,
.support-card code,
.adoption-grid code,
.section-copy code,
.path-card code,
.skill-row code {
  padding: 0.08rem 0.28rem;
  border-radius: 4px;
  background: var(--inline-code-bg);
  color: var(--ink);
  font-size: 0.88em;
}

.quick-start-link {
  display: inline-block;
  margin-top: 1rem;
  font-size: 0.86rem;
  font-weight: 600;
  border-bottom: 1px solid var(--link-line);
}

.quick-start-link:hover { border-bottom-color: var(--accent); }

/* ---------- Sticky in-page nav ---------- */
.tutorial-nav {
  position: sticky;
  top: var(--header-h);
  z-index: 4;
  overflow-x: auto;
  border-block: 1px solid var(--border);
  background: var(--header-bg);
  box-shadow: var(--header-shadow);
  backdrop-filter: blur(12px);
}

.tutorial-nav-inner {
  display: flex;
  gap: 1.35rem;
  min-width: max-content;
  padding-right: 0.5rem;
}

.tutorial-nav a {
  padding-block: 0.78rem;
  color: var(--text-muted);
  font-size: 0.82rem;
  font-weight: 600;
  white-space: nowrap;
  border-bottom: 2px solid transparent;
}

.tutorial-nav a:hover,
.tutorial-nav a:focus-visible {
  color: var(--ink);
  border-bottom-color: var(--accent);
}

#overview, #start, #model, #workflow, #contract, #inspect, #adopt, #limits,
#roles { scroll-margin-top: 6.6rem; }

.section-tint { background: var(--section-tint); }

.section-heading {
  max-width: 40rem;
  margin-bottom: 2.25rem;
}

.section-heading p {
  margin-top: 0.8rem;
  color: var(--text-muted);
}

.section-copy {
  max-width: 42rem;
  margin-top: 1.2rem;
  color: var(--text-muted);
}

.executive-heading { max-width: 46rem; }

.executive-grid,
.document-grid,
.boundary-grid,
.support-grid,
.feature-grid,
.host-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}

.executive-grid article,
.document-card,
.boundary-card,
.support-card,
.feature-card,
.host-card {
  padding: clamp(1.35rem, 4vw, 1.85rem);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
}

.executive-grid h3,
.document-card h3,
.boundary-card h3,
.support-card h3,
.feature-card h3,
.host-card h3 {
  color: var(--ink);
  font-size: 1.08rem;
}

.executive-grid p,
.document-card p,
.boundary-card p,
.support-card p,
.feature-card p,
.host-card p {
  margin-top: 0.65rem;
  color: var(--text-muted);
  font-size: 0.95rem;
}

.document-card a {
  display: inline-block;
  margin-top: 1.15rem;
  font-weight: 600;
  border-bottom: 1px solid var(--link-line);
}

.document-card a:hover { border-bottom-color: var(--accent); }

.principle-statement {
  display: grid;
  gap: 0.2rem;
  margin-top: 1.6rem;
  padding-left: 1rem;
  border-left: 3px solid var(--accent);
}

.principle-statement strong {
  color: var(--teal-soft);
  font-size: 0.73rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.principle-statement span { color: var(--ink); font-weight: 600; }

.composition-figure {
  margin: 2rem 0 0;
  padding: 1rem 1rem 1.15rem;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--diagram-bg);
}

.composition-scroll {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.composition-scroll img {
  width: 100%;
  min-width: 0;
  max-width: 100%;
  height: auto;
}

.composition-figure figcaption {
  margin-top: 0.85rem;
  color: var(--text-muted);
  font-size: 0.9rem;
  line-height: 1.5;
}

.prose .composition-figure { max-width: none; }

.tutorial-points {
  display: grid;
  gap: 1.25rem;
  margin-top: 2.2rem;
}

.tutorial-points article {
  padding-top: 1.15rem;
  border-top: 1px solid var(--border);
}

.tutorial-points h3 { color: var(--ink); font-size: 1rem; }
.tutorial-points p { margin-top: 0.5rem; color: var(--text-muted); font-size: 0.92rem; }

.workflow-steps {
  display: grid;
  gap: 1rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.workflow-steps li {
  display: grid;
  grid-template-columns: 2.3rem minmax(0, 1fr);
  gap: 0.85rem;
  padding: 1.35rem;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--surface);
}

.workflow-steps li > span {
  color: var(--teal-soft);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
}

.workflow-steps h3 { color: var(--ink); font-size: 1.1rem; }
.workflow-steps p { margin: 0.55rem 0 0.8rem; color: var(--text-muted); font-size: 0.92rem; }
.tutorial-support-grid { margin-top: 1.25rem; }
.tutorial-support-grid code { display: inline-block; margin-top: 0.8rem; }

.tutorial-split {
  display: grid;
  gap: clamp(2rem, 5vw, 4rem);
  align-items: start;
}

.anatomy-list {
  margin: 1.6rem 0 0;
  padding: 0;
  list-style: none;
}

.anatomy-list li {
  display: grid;
  gap: 0.25rem;
  padding-block: 0.8rem;
  border-top: 1px solid var(--border);
}

.anatomy-list strong { color: var(--ink); font-size: 0.95rem; }
.anatomy-list span { color: var(--text-muted); font-size: 0.9rem; }

.yaml-card {
  overflow: hidden;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--code-bg);
  box-shadow: var(--card-shadow);
}

.code-title {
  padding: 0.75rem 1.2rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.13);
  color: #B9D3DA;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.04em;
}

.yaml-card pre { margin: 0; border-radius: 0; }

.mechanics-grid {
  display: grid;
  gap: 1rem;
}

.mechanics-grid article {
  padding: 1.4rem;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--surface);
}

.mechanics-grid article > span {
  color: var(--teal-soft);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
}

.mechanics-grid h3 { margin-top: 0.55rem; color: var(--ink); font-size: 1.05rem; }
.mechanics-grid p { margin-top: 0.55rem; color: var(--text-muted); font-size: 0.91rem; }

.command-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  margin-top: 1.4rem;
}

.command-row code {
  padding: 0.45rem 0.7rem;
  border: 1px solid var(--border);
  border-radius: 7px;
  background: var(--inline-code-bg);
  color: var(--ink);
  font-size: 0.79rem;
}

.adoption-grid {
  display: grid;
  gap: 1rem;
}

.adoption-grid > article {
  padding: clamp(1.4rem, 4vw, 2rem);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
}

.adoption-grid h3 { color: var(--ink); font-size: 1.2rem; }
.adoption-grid ol { margin: 1.2rem 0 0; padding-left: 1.3rem; }
.adoption-grid li { color: var(--text-muted); font-size: 0.93rem; }
.adoption-grid li + li { margin-top: 0.6rem; }
.adoption-grid li::marker { color: var(--teal-soft); font-weight: 700; }

.tutorial-documents { margin-top: 1.25rem; }

.callout {
  margin-top: 2rem;
  padding: 1.35rem 1.5rem;
  border-left: 3px solid var(--accent);
  border-radius: 0 10px 10px 0;
  background: var(--callout-bg);
}

.callout strong { color: var(--ink); }
.callout p + p { margin-top: 0.75rem; }

.beta-callout {
  border-left-color: var(--warn-border);
  background: var(--warn-bg);
}

.cycle {
  display: grid;
  gap: 0.7rem;
  margin-top: 2rem;
}

.cycle-step {
  position: relative;
  padding: 1rem 1.1rem;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--surface);
  color: var(--ink);
  font-size: 0.93rem;
  font-weight: 600;
  text-align: center;
}

.cycle-step:not(:last-child)::after {
  content: "\2193";
  position: absolute;
  left: 50%;
  bottom: -1.16rem;
  z-index: 1;
  color: var(--teal-soft);
  transform: translateX(-50%);
}

.cycle-step.accent { border-color: rgba(17, 183, 165, 0.8); box-shadow: inset 0 3px 0 var(--accent); }

/* ---------- Inner pages ---------- */
.page-hero {
  padding: clamp(2rem, 3vw, 2.5rem) 0 clamp(2rem, 4vw, 3.5rem);
  background:
    radial-gradient(44rem 26rem at 88% -18%, var(--glow-teal), transparent 66%),
    radial-gradient(30rem 22rem at 102% 100%, var(--glow-blue), transparent 72%);
}

.page-hero ~ section { padding-block: clamp(3.5rem, 7vw, 5rem); }
.page-hero + section { padding-top: clamp(2rem, 4vw, 3rem); }

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin-bottom: 2rem;
  color: var(--text-muted);
  font-size: 0.86rem;
}

.breadcrumb a {
  color: var(--text-muted);
  border-bottom: 1px solid var(--link-line);
}

.breadcrumb a:hover { color: var(--ink); border-bottom-color: var(--accent); }
.breadcrumb span[aria-hidden="true"] { color: var(--teal-soft); }

.page-hero h1 {
  max-width: 16ch;
  font-size: clamp(1.85rem, 8vw, 3.8rem);
  color: var(--ink);
}

.doc-shell {
  display: grid;
  gap: 2.5rem;
  align-items: start;
}

.doc-nav {
  padding: 1.25rem;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--surface);
}

.doc-nav p {
  margin-bottom: 0.8rem;
  color: var(--ink);
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.doc-nav ul { list-style: none; margin: 0; padding: 0; }
.doc-nav li + li { margin-top: 0.48rem; }
.doc-nav a { color: var(--text-muted); font-size: 0.91rem; }
.doc-nav a:hover {
  color: var(--ink);
  text-decoration: underline;
  text-decoration-color: var(--accent);
  text-underline-offset: 3px;
}

.prose { min-width: 0; max-width: 48rem; }
.prose > :first-child { margin-top: 0; }
.prose h2 { margin-top: 3.5rem; font-size: clamp(1.55rem, 3vw, 2rem); scroll-margin-top: 5.5rem; }
.prose h3 { margin-top: 2rem; color: var(--ink); font-size: 1.18rem; }
.prose p { margin-top: 1rem; }
.prose ul, .prose ol { margin: 1rem 0 0; padding-left: 1.35rem; }
.prose li + li { margin-top: 0.45rem; }
.prose li::marker { color: var(--teal-soft); }
.prose strong { color: var(--ink); }
.prose code {
  padding: 0.1rem 0.32rem;
  border-radius: 4px;
  background: var(--inline-code-bg);
  color: var(--ink);
  font-size: 0.9em;
}

.prose pre {
  margin: 1.4rem 0 0;
  padding: 1.25rem 1.35rem;
  overflow-x: auto;
  border-radius: 10px;
  background: var(--code-bg);
  color: var(--code-fg);
  font-size: 0.86rem;
  line-height: 1.65;
  font-weight: 500;
}

.prose pre code { padding: 0; background: none; color: inherit; font-size: inherit; }

.table-wrap { margin-top: 1.4rem; overflow-x: auto; }
.prose table { width: 100%; border-collapse: collapse; font-size: 0.93rem; }
.prose th, .prose td { padding: 0.8rem; border: 1px solid var(--border); text-align: left; vertical-align: top; }
.prose th { background: var(--inline-code-bg); color: var(--ink); }

.principle {
  margin-top: 1.4rem;
  padding: 1.35rem 1.5rem;
  border-left: 3px solid var(--accent);
  background: var(--principle-bg);
  color: var(--ink);
  font-size: 1.08rem;
  font-weight: 600;
}

.page-next {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 1rem;
  margin-top: 4rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
}

.page-next a { font-weight: 600; }

/* ---------- Role / docs hub extras ---------- */
.skill-list {
  display: grid;
  gap: 0.75rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.skill-row {
  display: grid;
  gap: 0.35rem;
  padding: 1.1rem 1.2rem;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--surface);
}

.skill-row strong { color: var(--ink); }

.review-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 1rem;
}

.review-list li {
  padding: 1.2rem 1.3rem;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--surface);
}

.review-list h3 { color: var(--ink); font-size: 1.05rem; }
.review-list p { margin-top: 0.45rem; color: var(--text-muted); font-size: 0.93rem; }

.docs-index {
  display: grid;
  gap: 1rem;
}

/* ---------- Video dialog ---------- */
.video-dialog {
  width: min(72rem, calc(100vw - 2rem));
  max-width: none;
  padding: 0;
  overflow: hidden;
  border: 0;
  border-radius: var(--radius);
  background: #050812;
  box-shadow: 0 28px 90px rgba(5, 8, 18, 0.55);
}

.video-dialog::backdrop {
  background: rgba(2, 12, 22, 0.82);
  backdrop-filter: blur(5px);
}

.video-dialog-shell { background: #050812; }

.video-dialog-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.85rem 1rem 0.85rem 1.25rem;
  color: #fff;
}

.video-dialog-heading h2 { color: #fff; font-size: 1rem; }

.video-dialog-close {
  display: grid;
  width: 2.3rem;
  aspect-ratio: 1;
  padding: 0;
  place-items: center;
  border: 1px solid rgba(255, 255, 255, 0.24);
  border-radius: 50%;
  background: transparent;
  color: #fff;
  font: 400 1.45rem/1 sans-serif;
  cursor: pointer;
}

.video-dialog-close:hover { border-color: var(--accent); background: rgba(255, 255, 255, 0.08); }

.video-dialog-frame { aspect-ratio: 16 / 9; }

.video-dialog-frame iframe {
  display: block;
  width: 100%;
  height: 100%;
  border: 0;
}

/* ---------- Footer ---------- */
.site-footer {
  margin-top: clamp(2rem, 6vw, 4rem);
  padding-block: clamp(3.5rem, 8vw, 5.5rem) 2.5rem;
  background: linear-gradient(135deg, var(--footer-from), var(--footer-to));
  color: var(--footer-text);
}

.footer-grid {
  display: grid;
  gap: 2rem;
}

.footer-contact h2 { color: #fff; }

.footer-email {
  display: inline-block;
  margin-top: 1rem;
  font-size: clamp(1.05rem, 3vw, 1.5rem);
  font-weight: 500;
  color: var(--footer-text);
  overflow-wrap: anywhere;
  border-bottom: 2px solid rgba(17, 183, 165, 0.58);
  transition: border-color 0.2s ease, color 0.2s ease;
}

.footer-email:hover { color: #fff; border-bottom-color: var(--accent); }
.footer-email:focus-visible { outline-color: var(--accent); }

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem 1.4rem;
}

.footer-links a {
  color: var(--footer-link);
  font-size: 0.92rem;
  font-weight: 500;
}

.footer-links a:hover { color: #fff; }

.footer-bottom {
  margin-top: 3.5rem;
  padding-top: 1.75rem;
  border-top: 1px solid var(--footer-rule);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem 1.5rem;
  font-size: 0.9rem;
  color: var(--footer-muted);
}

.footer-bottom img,
.footer-bottom .brand-mark {
  width: 34px;
  height: 34px;
  border-radius: 9px;
  box-shadow: 0 0 0 1px rgba(255, 255, 255, 0.12);
}

.footer-bottom a { color: #D7EEF1; border-bottom: 1px solid rgba(17, 183, 165, 0.4); }
.footer-bottom a:hover { border-bottom-color: var(--accent); }

@media (min-width: 760px) {
  .document-grid, .docs-index, .workflow-steps, .mechanics-grid, .adoption-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-grid { grid-template-columns: 1.3fr 0.9fr; align-items: start; }
}

@media (min-width: 880px) {
  .nav-toggle { display: none; }
  .site-header nav {
    display: flex;
    position: static;
    flex-direction: row;
    flex-wrap: wrap;
    justify-content: flex-end;
    margin-left: auto;
    gap: clamp(0.15rem, 1.5vw, 0.35rem);
    padding: 0;
    border: 0;
    border-radius: 0;
    background: transparent;
    box-shadow: none;
  }
  .header-actions { margin-left: 0.35rem; }
  .site-header nav a {
    padding: 0.35rem 0.55rem;
    font-size: 0.92rem;
    border-bottom: 2px solid transparent;
    border-radius: 0;
    background: transparent;
  }
  .site-header nav a:hover {
    background: transparent;
    border-bottom-color: var(--accent);
  }
  .site-header nav a[aria-current="page"] {
    background: transparent;
    border-bottom-color: var(--accent);
  }
  .doc-shell { grid-template-columns: 12.5rem minmax(0, 1fr); }
  .doc-nav { position: sticky; top: 5.2rem; }
  .skill-row {
    grid-template-columns: 9.5rem minmax(0, 1fr);
    gap: 1rem;
    align-items: start;
  }
}

@media (min-width: 960px) {
  .feature-grid, .boundary-grid, .support-grid, .host-grid, .executive-grid, .tutorial-points {
    grid-template-columns: repeat(3, 1fr);
  }
  .cycle { grid-template-columns: repeat(4, 1fr); }
  .cycle-step:not(:last-child)::after {
    content: "\2192";
    left: auto;
    right: -0.88rem;
    bottom: auto;
    top: 50%;
    transform: translateY(-50%);
  }
  .home-hero-layout { grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr); }
  .home-hero-layout .path-grid { grid-template-columns: 1fr; }
}

@media (min-width: 1080px) {
  .docs-index { grid-template-columns: repeat(3, 1fr); }
  .quick-start-wide { grid-template-columns: minmax(0, 0.95fr) minmax(22rem, 1.05fr); }
  .quick-start-intro { border-right: 1px solid var(--border); }
  .tutorial-split { grid-template-columns: minmax(0, 0.95fr) minmax(20rem, 1.05fr); }
}

@media (max-width: 640px) {
  .quick-start-intro,
  .quick-start-heading,
  .quick-start-panel { padding-inline: 1.1rem; }
  .quick-start-tabs { padding-inline: 1.1rem; }
  .page-actions { flex-direction: column; align-items: stretch; }
  .page-actions .button { width: 100%; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .skip-link, .button, .hero-video-trigger img, .hero-video-trigger::after { transition: none; }
}