/*
 * site.css - hand-rolled styles for evoframework.org
 *
 * Visual register matched to evo-ui-eng: gradient surfaces, brand-color
 * glows, concentric ring motifs, fluid grids, hover lifts. The site
 * should feel continuous with the device UI, not like a different era.
 */

/* ---- reset ------------------------------------------------------- */

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

html {
  -webkit-text-size-adjust: 100%;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(ellipse 60% 50% at 78% 8%,
      color-mix(in oklab, var(--primary) 22%, transparent),
      transparent 65%),
    radial-gradient(ellipse 50% 40% at 12% 92%,
      color-mix(in oklab, var(--accent) 14%, transparent),
      transparent 60%),
    linear-gradient(
      155deg,
      color-mix(in oklab, var(--background) 96%, black) 0%,
      color-mix(in oklab, var(--background) 78%, var(--accent) 6%) 55%,
      color-mix(in oklab, var(--background) 94%, black) 100%);
  background-attachment: fixed;
  color: var(--foreground);
  font-family: Inter, system-ui, -apple-system, "Segoe UI", Helvetica, Arial, sans-serif;
  font-size: 18px;
  line-height: 1.65;
  font-feature-settings: "kern", "liga", "ss01";
}

img,
svg {
  max-width: 100%;
  height: auto;
}

/* ---- layout ------------------------------------------------------ */

.site-header,
.site-main,
.site-footer {
  max-width: 68rem;
  margin: 0 auto;
  padding-left: 1.5rem;
  padding-right: 1.5rem;
}

.site-header {
  display: flex;
  align-items: center;
  gap: 1.75rem;
  flex-wrap: wrap;
  padding-top: 1.5rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid color-mix(in oklab, var(--border) 50%, transparent);
  backdrop-filter: blur(8px);
}

.site-main {
  padding-top: 3.5rem;
  padding-bottom: 5rem;
}

.site-footer {
  padding-top: 2.5rem;
  padding-bottom: 3rem;
  border-top: 1px solid color-mix(in oklab, var(--border) 50%, transparent);
  font-size: 0.92rem;
  color: var(--muted-foreground);
}

.site-footer p {
  margin: 0.4rem 0;
}

/* prose pages get a narrower measure for readability */
.page,
.section {
  max-width: 44rem;
}

.section .section-pages,
.section .section-subsections {
  max-width: none;
  margin-top: 3rem;
}

/* ---- header / nav ----------------------------------------------- */

.site-brand {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  font-weight: 600;
  font-size: 1.15rem;
  text-decoration: none;
  color: var(--foreground);
  letter-spacing: -0.01em;
}

.site-brand::before {
  content: "";
  display: inline-block;
  width: 1.55rem;
  height: 1.55rem;
  border-radius: 0.45rem;
  background: linear-gradient(120deg, #00d4aa, #00a080);
  box-shadow: 0 6px 20px color-mix(in oklab, var(--primary) 50%, transparent),
              0 0 0 1px color-mix(in oklab, var(--primary) 30%, transparent);
}

.site-brand-tm {
  font-size: 0.5em;
  vertical-align: super;
  margin-left: 0.1em;
  color: var(--muted-foreground);
  font-weight: 400;
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 1.3rem;
  flex: 1;
}

.site-nav a {
  color: color-mix(in oklab, var(--foreground) 70%, var(--muted-foreground));
  text-decoration: none;
  font-size: 0.96rem;
  padding: 0.3rem 0.1rem;
  position: relative;
  transition: color 0.18s ease;
}

.site-nav a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--primary), transparent);
  opacity: 0;
  transform: scaleX(0.6);
  transition: opacity 0.2s ease, transform 0.2s ease;
}

.site-nav a:hover,
.site-nav a:focus {
  color: var(--foreground);
}

.site-nav a:hover::after,
.site-nav a:focus::after {
  opacity: 1;
  transform: scaleX(1);
}

.site-source {
  color: var(--muted-foreground);
  text-decoration: none;
  font-size: 0.92rem;
  transition: color 0.18s ease;
}

.site-source:hover,
.site-source:focus {
  color: var(--primary);
}

/* ---- typography -------------------------------------------------- */

h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin: 2.75rem 0 1rem;
  color: var(--foreground);
}

h1 {
  font-size: 2.6rem;
  margin-top: 0;
  letter-spacing: -0.03em;
}

h2 {
  font-size: 1.7rem;
  padding-bottom: 0;
  margin-top: 3.5rem;
  border-bottom: none;
  position: relative;
}

h2::before {
  content: "";
  display: block;
  width: 2.5rem;
  height: 2px;
  background: linear-gradient(90deg, var(--primary), transparent);
  margin-bottom: 0.85rem;
  border-radius: 2px;
}

h3 {
  font-size: 1.22rem;
  color: color-mix(in oklab, var(--foreground) 92%, var(--primary));
}

h4 { font-size: 1rem; }

p {
  margin: 0 0 1.05rem;
}

.lead {
  font-size: 1.18rem;
  line-height: 1.55;
  color: color-mix(in oklab, var(--foreground) 85%, var(--muted-foreground));
  max-width: 38rem;
}

.page-header,
.section-header {
  margin-bottom: 2.5rem;
}

.page-description,
.section-description {
  font-size: 1.15rem;
  color: var(--muted-foreground);
  margin-top: 0.4rem;
  max-width: 40rem;
}

a {
  color: var(--primary);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.2em;
  text-decoration-color: color-mix(in oklab, var(--primary) 45%, transparent);
  transition: color 0.18s ease, text-decoration-color 0.18s ease;
}

a:hover,
a:focus {
  color: var(--accent);
  text-decoration-color: var(--accent);
}

strong {
  font-weight: 600;
  color: color-mix(in oklab, var(--foreground) 95%, var(--primary));
}

em {
  color: color-mix(in oklab, var(--foreground) 95%, var(--accent));
}

blockquote {
  margin: 1.5rem 0;
  padding: 0.85rem 1.25rem;
  border-left: 3px solid var(--accent);
  color: color-mix(in oklab, var(--foreground) 88%, var(--muted-foreground));
  background: color-mix(in oklab, var(--card) 60%, transparent);
  border-radius: 0 var(--radius) var(--radius) 0;
  backdrop-filter: blur(4px);
}

hr,
.section-divider {
  border: none;
  height: 1px;
  background: linear-gradient(90deg,
    transparent,
    color-mix(in oklab, var(--border) 80%, transparent) 20%,
    color-mix(in oklab, var(--primary) 30%, transparent) 50%,
    color-mix(in oklab, var(--border) 80%, transparent) 80%,
    transparent);
  margin: 3.5rem 0;
}

ul, ol {
  padding-left: 1.5rem;
  margin: 0 0 1.1rem;
}

li {
  margin: 0.35rem 0;
}

/* ---- code -------------------------------------------------------- */

code,
kbd,
samp {
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
  font-size: 0.9em;
}

p code,
li code,
td code {
  background: color-mix(in oklab, var(--muted) 85%, var(--primary) 14%);
  color: var(--foreground);
  padding: 0.12em 0.42em;
  border-radius: 0.3rem;
  border: 1px solid color-mix(in oklab, var(--border) 60%, transparent);
}

pre {
  background:
    linear-gradient(180deg,
      color-mix(in oklab, var(--card) 88%, black),
      color-mix(in oklab, var(--card) 92%, black));
  color: var(--card-foreground);
  border: 1px solid color-mix(in oklab, var(--border) 80%, transparent);
  border-radius: var(--radius);
  padding: 1.05rem 1.2rem;
  overflow-x: auto;
  font-size: 0.9rem;
  line-height: 1.6;
  margin: 1.5rem 0;
  box-shadow:
    0 1px 0 color-mix(in oklab, var(--primary) 8%, transparent) inset,
    0 8px 28px color-mix(in oklab, black 50%, transparent),
    0 0 0 1px color-mix(in oklab, var(--primary) 6%, transparent);
}

pre code {
  background: none;
  border: none;
  padding: 0;
  color: inherit;
}

/* Giallo (Zola 0.22 syntax highlighter) classes. */
.giallo-l {
  display: inline-block;
  min-height: 1lh;
  width: 100%;
}

.giallo-ln {
  display: inline-block;
  user-select: none;
  margin-right: 0.4em;
  padding: 0.4em;
  min-width: 3ch;
  text-align: right;
  opacity: 0.6;
}

/* ---- tables ----------------------------------------------------- */

table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
  font-size: 0.96rem;
  border: 1px solid color-mix(in oklab, var(--border) 60%, transparent);
  border-radius: var(--radius);
  overflow: hidden;
  background: color-mix(in oklab, var(--card) 50%, transparent);
}

th, td {
  text-align: left;
  padding: 0.75rem 1rem;
  border-bottom: 1px solid color-mix(in oklab, var(--border) 40%, transparent);
  vertical-align: top;
}

th {
  font-weight: 600;
  color: var(--foreground);
  background: color-mix(in oklab, var(--card) 70%, transparent);
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--muted-foreground);
}

tr:last-child td {
  border-bottom: none;
}

/* ---- homepage ---------------------------------------------------- */

.home {
  max-width: 64rem;
  margin: 0 auto;
}

.home > * {
  max-width: 44rem;
  margin-left: auto;
  margin-right: auto;
}

/* allow some elements to break out to full width */
.home .home-hero-layout,
.home .tier-diagram,
.home .tier-diagram-wrap,
.home .card-grid,
.home .vocabulary-grid,
.home .cta-row {
  max-width: 64rem;
}

.home h2 {
  margin-top: 4rem;
}

/* hero ----------------------------------------------------- */

.home-hero-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
  gap: 3rem;
  align-items: center;
  margin: 1.5rem 0 2.5rem;
}

@media (max-width: 860px) {
  .home-hero-layout {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }
}

.home-hero-text {
  min-width: 0;
}

.home-hero {
  font-size: clamp(2rem, 4.5vw, 3.2rem);
  line-height: 1.05;
  letter-spacing: -0.035em;
  font-weight: 700;
  margin: 0 0 1.5rem;
  background: linear-gradient(120deg,
    var(--foreground) 0%,
    var(--foreground) 45%,
    var(--primary) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: var(--foreground);
}

.home-subhead {
  font-size: 1.18rem;
  line-height: 1.55;
  color: color-mix(in oklab, var(--foreground) 78%, var(--muted-foreground));
  margin-bottom: 0;
  max-width: 36rem;
}

/* hero visual: brand mark surface with concentric rings */
.home-hero-visual {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 300px;
  isolation: isolate;
}

.hero-mark {
  position: relative;
  width: clamp(180px, 28vw, 260px);
  aspect-ratio: 1 / 1;
  border-radius: 24px;
  background:
    radial-gradient(circle at 30% 25%,
      color-mix(in oklab, var(--primary) 35%, transparent) 0%,
      transparent 55%),
    radial-gradient(circle at 70% 80%,
      color-mix(in oklab, var(--accent) 28%, transparent) 0%,
      transparent 55%),
    linear-gradient(145deg,
      color-mix(in oklab, var(--card) 70%, black) 0%,
      color-mix(in oklab, var(--card) 50%, var(--primary) 8%) 55%,
      color-mix(in oklab, var(--card) 80%, black) 100%);
  border: 1px solid color-mix(in oklab, var(--primary) 22%, transparent);
  box-shadow:
    0 24px 48px color-mix(in oklab, var(--primary) 14%, transparent),
    0 4px 16px color-mix(in oklab, black 50%, transparent),
    0 0 0 1px color-mix(in oklab, var(--primary) 12%, transparent) inset;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1;
}

.hero-mark::before,
.hero-mark::after {
  content: "";
  position: absolute;
  border-radius: 50%;
  pointer-events: none;
  z-index: -1;
}

.hero-mark::before {
  inset: -28px;
  border: 1px solid color-mix(in oklab, var(--primary) 22%, transparent);
}

.hero-mark::after {
  inset: -56px;
  border: 1px solid color-mix(in oklab, var(--primary) 12%, transparent);
}

/* the inner brand glyph - beating heart of the framework */
.hero-mark-glyph {
  position: relative;
  width: 38%;
  height: 38%;
  border-radius: 18%;
  background: linear-gradient(120deg, #00d4aa, #00a080);
  box-shadow:
    0 12px 32px color-mix(in oklab, var(--primary) 35%, transparent),
    0 0 0 1px color-mix(in oklab, var(--primary) 30%, transparent) inset;
  animation: hero-heartbeat 1.5s ease-in-out infinite;
  transform-origin: center;
  will-change: transform;
}

/* The ring that ripples outward on each heartbeat */
.hero-mark-glyph::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  border: 2px solid var(--primary);
  opacity: 0;
  pointer-events: none;
  animation: hero-ring-ripple-1 1.5s ease-out infinite;
  will-change: transform, opacity;
}

/* Second ripple, offset half a beat for a layered feel */
.hero-mark-glyph::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  border: 1px solid var(--primary);
  opacity: 0;
  pointer-events: none;
  animation: hero-ring-ripple-2 1.5s ease-out infinite;
  animation-delay: 0.21s;
  will-change: transform, opacity;
}

@keyframes hero-heartbeat {
  0%, 100% {
    transform: scale(1);
    box-shadow:
      0 12px 32px color-mix(in oklab, var(--primary) 35%, transparent),
      0 0 0 1px color-mix(in oklab, var(--primary) 30%, transparent) inset;
  }
  7% {
    transform: scale(1.06);
    box-shadow:
      0 16px 40px color-mix(in oklab, var(--primary) 50%, transparent),
      0 0 0 1px color-mix(in oklab, var(--primary) 40%, transparent) inset;
  }
  14% {
    transform: scale(1);
  }
  21% {
    transform: scale(1.04);
    box-shadow:
      0 14px 36px color-mix(in oklab, var(--primary) 42%, transparent),
      0 0 0 1px color-mix(in oklab, var(--primary) 35%, transparent) inset;
  }
  28% {
    transform: scale(1);
    box-shadow:
      0 12px 32px color-mix(in oklab, var(--primary) 35%, transparent),
      0 0 0 1px color-mix(in oklab, var(--primary) 30%, transparent) inset;
  }
}

@keyframes hero-ring-ripple-1 {
  0%   { opacity: 0; transform: scale(1); }
  7%   { opacity: 0.55; }
  100% { opacity: 0; transform: scale(2.6); }
}

@keyframes hero-ring-ripple-2 {
  0%   { opacity: 0; transform: scale(1); }
  7%   { opacity: 0.35; }
  100% { opacity: 0; transform: scale(2.2); }
}

@media (prefers-reduced-motion: reduce) {
  .hero-mark-glyph,
  .hero-mark-glyph::before,
  .hero-mark-glyph::after {
    animation: none;
  }
  .hero-mark-glyph::before,
  .hero-mark-glyph::after {
    display: none;
  }
}

/* ambient floating dots, decorative */
.hero-mark-dot {
  position: absolute;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--primary);
  box-shadow: 0 0 12px var(--primary);
  opacity: 0.6;
}

.hero-mark-dot-1 { top: 12%; right: 14%; }
.hero-mark-dot-2 { bottom: 18%; left: 18%; opacity: 0.4; }
.hero-mark-dot-3 { top: 50%; right: -8%; opacity: 0.35; }

/* tier diagram --------------------------------------------- */

.tier-diagram-wrap {
  margin: 2.5rem auto 1.5rem;
  padding: 1.5rem 0.5rem;
  position: relative;
  isolation: isolate;
}

.tier-diagram-wrap::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 60% at 50% 50%,
      color-mix(in oklab, var(--primary) 8%, transparent),
      transparent 70%);
  z-index: -1;
}

.tier-diagram {
  width: 100%;
  height: auto;
  display: block;
  max-width: 56rem;
  margin: 0 auto;
}

.tier-diagram-caption {
  margin: 1.25rem auto 0;
  max-width: 42rem;
  font-size: 0.95rem;
  color: var(--muted-foreground);
  text-align: center;
  font-style: italic;
}

/* SVG tier diagram text styling */
.svg-tier-label {
  fill: #00d4aa;
  font-family: Inter, system-ui, sans-serif;
  font-size: 22px;
  font-weight: 700;
  letter-spacing: 0.1em;
}

.svg-tier-label-strong {
  font-size: 26px;
}

.svg-tier-subtitle {
  fill: #6a8aa5;
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  font-size: 15px;
  letter-spacing: 0.02em;
  font-style: italic;
}

.svg-tier-content {
  fill: #d8e4f0;
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  font-size: 14px;
}

.svg-connector-label {
  fill: #7ea0bc;
  font-family: Inter, system-ui, sans-serif;
  font-size: 13px;
  font-style: italic;
}

/* Subtle pulsing animation on the connectors */
@keyframes connector-pulse {
  0%, 100% { stroke-opacity: 0.55; }
  50%      { stroke-opacity: 1; }
}

.svg-connector {
  animation: connector-pulse 3.4s ease-in-out infinite;
}

/* Tier diagram (homepage) - additional classes for the next-gen version */
.contract-channel-label {
  fill: #00d4aa;
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  font-size: 12px;
  letter-spacing: 0.06em;
  font-weight: 600;
  text-transform: uppercase;
}

.contract-master-label {
  fill: #7ea0bc;
  font-family: Inter, system-ui, sans-serif;
  font-size: 13px;
  font-style: italic;
  letter-spacing: 0.03em;
}

/* Hub diagram (concept page) ------------------------------- */

.hub-diagram-wrap {
  margin: 2rem auto 1.5rem;
  padding: 1rem 0;
  position: relative;
  isolation: isolate;
  max-width: none;
}

.hub-diagram-wrap::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 70% 55% at 50% 50%,
      color-mix(in oklab, var(--primary) 6%, transparent),
      transparent 75%);
  z-index: -1;
}

.hub-diagram {
  width: 100%;
  height: auto;
  display: block;
  max-width: 60rem;
  margin: 0 auto;
}

.hub-diagram-caption {
  margin: 1.5rem auto 0;
  max-width: 44rem;
  font-size: 0.95rem;
  color: var(--muted-foreground);
  text-align: center;
  font-style: italic;
}

.hub-plugin-label,
.hub-consumer-label {
  fill: #d8e4f0;
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.02em;
}

.hub-consumer-label {
  font-size: 13px;
}

.hub-steward-label {
  fill: #00d4aa;
  font-family: Inter, system-ui, sans-serif;
  font-size: 26px;
  font-weight: 700;
  letter-spacing: 0.12em;
}

.hub-steward-sub {
  fill: #7ea0bc;
  font-family: Inter, system-ui, sans-serif;
  font-size: 14px;
  font-style: italic;
  letter-spacing: 0.04em;
}

.hub-steward-content {
  fill: #d8e4f0;
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  font-size: 14px;
}

.hub-line-label {
  fill: #7ea0bc;
  font-family: Inter, system-ui, sans-serif;
  font-size: 13px;
  font-style: italic;
  letter-spacing: 0.02em;
}

/* Concept page section overrides */

.section .hub-diagram-wrap,
.section .tier-diagram-wrap {
  max-width: none;
  margin-left: -2rem;
  margin-right: -2rem;
}

@media (max-width: 720px) {
  .section .hub-diagram-wrap,
  .section .tier-diagram-wrap {
    margin-left: -1rem;
    margin-right: -1rem;
  }
}

/* Respect reduced motion preference: stop the particle animations */
@media (prefers-reduced-motion: reduce) {
  .svg-connector,
  .hub-diagram circle[r],
  .hub-diagram animateMotion,
  .reach-diagram circle[r] {
    animation: none !important;
  }
  .hub-diagram circle[r],
  .reach-diagram circle[r] {
    display: none;
  }
}

/* Reach diagram (distributions page) ------------------------ */

.reach-diagram-wrap {
  margin: 2rem auto 1.5rem;
  padding: 1rem 0;
  position: relative;
  isolation: isolate;
  max-width: none;
}

.reach-diagram-wrap::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 70% 60% at 50% 50%,
      color-mix(in oklab, var(--primary) 6%, transparent),
      transparent 75%);
  z-index: -1;
}

.reach-diagram {
  width: 100%;
  height: auto;
  display: block;
  max-width: 64rem;
  margin: 0 auto;
}

.reach-diagram-caption {
  margin: 1.25rem auto 0;
  max-width: 44rem;
  font-size: 0.95rem;
  color: var(--muted-foreground);
  text-align: center;
  font-style: italic;
}

.reach-card-title {
  fill: #00d4aa;
  font-family: Inter, system-ui, sans-serif;
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.reach-card-arch {
  fill: #7ea0bc;
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  font-size: 11px;
  letter-spacing: 0.02em;
}

.reach-card-examples {
  fill: #d8e4f0;
  font-family: Inter, system-ui, sans-serif;
  font-size: 11px;
  font-style: italic;
  opacity: 0.85;
}

.reach-band-title {
  fill: #00d4aa;
  font-family: Inter, system-ui, sans-serif;
  font-size: 22px;
  font-weight: 700;
  letter-spacing: 0.08em;
}

.reach-band-subtitle {
  fill: #7ea0bc;
  font-family: Inter, system-ui, sans-serif;
  font-size: 13px;
  font-style: italic;
  letter-spacing: 0.03em;
}

.reach-scale-label {
  fill: #d8e4f0;
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.02em;
}

.reach-scale-sublabel {
  fill: #6a8aa5;
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  font-size: 11px;
  letter-spacing: 0.02em;
}

.reach-bottom-text {
  fill: #d8e4f0;
  font-family: Inter, system-ui, sans-serif;
  font-size: 15px;
  font-weight: 500;
  letter-spacing: 0.04em;
  font-style: italic;
}

.section .reach-diagram-wrap {
  max-width: none;
  margin-left: -2rem;
  margin-right: -2rem;
}

@media (max-width: 720px) {
  .section .reach-diagram-wrap {
    margin-left: -1rem;
    margin-right: -1rem;
  }
}

/* Flow diagram (build page) -------------------------------- */

.flow-diagram-wrap {
  margin: 2rem auto 1.5rem;
  padding: 1rem 0;
  position: relative;
  isolation: isolate;
  max-width: none;
}

.flow-diagram-wrap::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 70% 55% at 50% 50%,
      color-mix(in oklab, var(--primary) 8%, transparent),
      transparent 75%);
  z-index: -1;
}

.flow-diagram {
  width: 100%;
  height: auto;
  display: block;
  max-width: 64rem;
  margin: 0 auto;
}

.flow-diagram-caption {
  margin: 1.5rem auto 0;
  max-width: 44rem;
  font-size: 0.95rem;
  color: var(--muted-foreground);
  text-align: center;
  font-style: italic;
}

.flow-card-title {
  fill: #00d4aa;
  font-family: Inter, system-ui, sans-serif;
  font-size: 22px;
  font-weight: 700;
  letter-spacing: 0.06em;
}

.flow-card-title-large {
  font-size: 30px;
  letter-spacing: 0.04em;
}

.flow-card-subtitle {
  fill: #7ea0bc;
  font-family: Inter, system-ui, sans-serif;
  font-size: 14px;
  font-style: italic;
  letter-spacing: 0.04em;
}

.flow-card-content {
  fill: #d8e4f0;
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  font-size: 14px;
  letter-spacing: 0.02em;
}

.flow-card-content-sm {
  fill: #b3c5d6;
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  font-size: 12px;
  letter-spacing: 0.02em;
  opacity: 0.9;
}

.section .flow-diagram-wrap {
  max-width: none;
  margin-left: -2rem;
  margin-right: -2rem;
}

@media (max-width: 720px) {
  .section .flow-diagram-wrap {
    margin-left: -1rem;
    margin-right: -1rem;
  }
}

/* 404 / error page ----------------------------------------- */

.error-page {
  max-width: 44rem;
  margin: 0 auto;
  padding-top: 2rem;
  text-align: center;
  position: relative;
  isolation: isolate;
}

.error-art-wrap {
  position: relative;
  width: clamp(280px, 50vw, 460px);
  aspect-ratio: 1 / 1;
  margin: 1rem auto 2rem;
  display: flex;
  align-items: center;
  justify-content: center;
}

.error-art {
  width: 100%;
  height: auto;
  display: block;
}

.error-code {
  font-size: clamp(4rem, 12vw, 7.5rem);
  line-height: 1;
  letter-spacing: -0.05em;
  font-weight: 700;
  margin: 0 0 1rem;
  background: linear-gradient(120deg,
    var(--foreground) 0%,
    var(--primary) 50%,
    var(--foreground) 100%);
  background-size: 200% 200%;
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: var(--foreground);
  animation: error-code-shimmer 6s ease-in-out infinite;
}

@keyframes error-code-shimmer {
  0%, 100% { background-position: 0% 50%; }
  50%      { background-position: 100% 50%; }
}

.error-message {
  font-size: 1.4rem;
  line-height: 1.4;
  font-weight: 500;
  color: var(--foreground);
  margin: 0 0 0.85rem;
  letter-spacing: -0.01em;
}

.error-detail {
  font-size: 1.05rem;
  line-height: 1.55;
  color: var(--muted-foreground);
  max-width: 32rem;
  margin: 0 auto 2.5rem;
  font-style: italic;
}

.error-actions {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(14rem, 1fr));
  gap: 1rem;
  max-width: 36rem;
  margin: 0 auto;
}

@keyframes error-ring-pulse-1 {
  0%   { transform: scale(0.5); opacity: 0; }
  20%  { opacity: 0.5; }
  100% { transform: scale(2.2); opacity: 0; }
}

@keyframes error-ring-pulse-2 {
  0%   { transform: scale(0.5); opacity: 0; }
  20%  { opacity: 0.4; }
  100% { transform: scale(2.5); opacity: 0; }
}

@media (prefers-reduced-motion: reduce) {
  .error-code {
    animation: none;
  }
  .error-art .err-ring {
    animation: none !important;
    opacity: 0.3 !important;
  }
}

/* status pill ---------------------------------------------- */

.pill {
  display: inline-block;
  border-radius: 999px;
  font-size: 0.7rem;
  line-height: 1;
  padding: 0.34rem 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-weight: 600;
  white-space: nowrap;
}

.pill-ok {
  background: color-mix(in oklab, var(--status-ok) 18%, transparent);
  color: var(--status-ok);
  border: 1px solid color-mix(in oklab, var(--status-ok) 35%, transparent);
}

.pill-warn {
  background: color-mix(in oklab, var(--status-warn) 18%, transparent);
  color: var(--status-warn);
  border: 1px solid color-mix(in oklab, var(--status-warn) 35%, transparent);
}

.pill-info {
  background: color-mix(in oklab, var(--primary) 14%, transparent);
  color: var(--primary);
  border: 1px solid color-mix(in oklab, var(--primary) 35%, transparent);
}

.pill-muted {
  background: color-mix(in oklab, var(--muted) 70%, transparent);
  color: var(--muted-foreground);
  border: 1px solid color-mix(in oklab, var(--border) 50%, transparent);
}

/* card grid ------------------------------------------------ */

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(18rem, 1fr));
  gap: 1.25rem;
  margin: 1.75rem 0;
}

.card {
  position: relative;
  background:
    linear-gradient(155deg,
      color-mix(in oklab, var(--card) 80%, black),
      color-mix(in oklab, var(--card) 95%, black));
  border: 1px solid color-mix(in oklab, var(--border) 70%, transparent);
  border-radius: var(--radius);
  padding: 1.4rem;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
  transition: transform 0.22s ease, border-color 0.22s ease, box-shadow 0.22s ease;
  isolation: isolate;
  overflow: hidden;
}

.card::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 100% 60% at 50% -20%,
      color-mix(in oklab, var(--primary) 12%, transparent),
      transparent 60%);
  opacity: 0.4;
  z-index: -1;
  transition: opacity 0.22s ease;
}

.card:hover,
.card:focus-within {
  transform: translateY(-2px);
  border-color: color-mix(in oklab, var(--primary) 50%, transparent);
  box-shadow:
    0 16px 36px color-mix(in oklab, var(--primary) 14%, transparent),
    0 4px 12px color-mix(in oklab, black 30%, transparent);
}

.card:hover::before,
.card:focus-within::before {
  opacity: 0.85;
}

.card h3 {
  margin: 0;
  font-size: 1.15rem;
  color: var(--foreground);
}

.card-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: 0.1rem;
}

.card p {
  margin: 0;
  color: color-mix(in oklab, var(--foreground) 82%, var(--muted-foreground));
  font-size: 0.95rem;
  line-height: 1.6;
}

.card-links {
  margin-top: auto;
  padding-top: 0.5rem;
  font-size: 0.9rem;
  color: var(--muted-foreground);
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
}

.card-links a {
  color: var(--primary);
  text-decoration: none;
  border-bottom: 1px solid color-mix(in oklab, var(--primary) 35%, transparent);
  padding-bottom: 1px;
  transition: color 0.18s ease, border-color 0.18s ease;
}

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

/* vocabulary grid ------------------------------------------ */

.vocabulary-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(13.5rem, 1fr));
  gap: 0.75rem;
  margin: 1.75rem 0 2.5rem;
}

.vocab-cell {
  position: relative;
  padding: 0.95rem 1rem;
  border-radius: 0.65rem;
  background:
    linear-gradient(160deg,
      color-mix(in oklab, var(--card) 65%, transparent),
      color-mix(in oklab, var(--card) 85%, black));
  border: 1px solid color-mix(in oklab, var(--border) 50%, transparent);
  transition: border-color 0.18s ease, transform 0.18s ease, box-shadow 0.18s ease;
  cursor: default;
}

.vocab-cell:hover {
  border-color: color-mix(in oklab, var(--primary) 55%, transparent);
  transform: translateY(-1px);
  box-shadow:
    0 6px 18px color-mix(in oklab, var(--primary) 12%, transparent);
}

.vocab-term {
  display: block;
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--primary);
  letter-spacing: -0.005em;
  margin-bottom: 0.2rem;
}

.vocab-role {
  display: block;
  font-size: 0.85rem;
  line-height: 1.45;
  color: color-mix(in oklab, var(--foreground) 80%, var(--muted-foreground));
}

/* CTA row -------------------------------------------------- */

.cta-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(14rem, 1fr));
  gap: 1rem;
  margin: 2rem 0 2.5rem;
}

.cta {
  display: block;
  padding: 1.1rem 1.25rem;
  border-radius: var(--radius);
  background:
    linear-gradient(155deg,
      color-mix(in oklab, var(--card) 75%, black),
      color-mix(in oklab, var(--card) 92%, black));
  border: 1px solid color-mix(in oklab, var(--border) 70%, transparent);
  color: var(--foreground);
  text-decoration: none;
  position: relative;
  isolation: isolate;
  overflow: hidden;
  transition: transform 0.22s ease, border-color 0.22s ease, box-shadow 0.22s ease;
}

.cta::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(120deg,
    transparent 30%,
    color-mix(in oklab, var(--primary) 8%, transparent) 60%,
    transparent 100%);
  opacity: 0;
  z-index: -1;
  transition: opacity 0.22s ease;
}

.cta:hover,
.cta:focus {
  transform: translateY(-2px);
  border-color: color-mix(in oklab, var(--primary) 55%, transparent);
  color: var(--foreground);
  box-shadow:
    0 12px 28px color-mix(in oklab, var(--primary) 14%, transparent);
}

.cta:hover::before,
.cta:focus::before {
  opacity: 1;
}

.cta strong {
  display: block;
  font-size: 1.02rem;
  margin-bottom: 0.3rem;
  color: var(--primary);
}

.cta span {
  display: block;
  font-size: 0.92rem;
  color: var(--muted-foreground);
}

/* section-pages list (used on /concept, /docs, /build, /distributions, /project) */

.section-pages h2,
.section-subsections h2 {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted-foreground);
}

.section-pages h2::before,
.section-subsections h2::before {
  width: 2rem;
}

.section-pages ul,
.section-subsections ul {
  list-style: none;
  padding: 0;
}

.section-pages li,
.section-subsections li {
  padding: 0.7rem 0;
  border-bottom: 1px solid color-mix(in oklab, var(--border) 40%, transparent);
}

/* ---- responsive tweaks ------------------------------------------- */

@media (max-width: 720px) {
  body { font-size: 17px; }
  .site-header { gap: 0.7rem; }
  .site-nav { gap: 1rem; width: 100%; order: 3; }
  .home-hero { font-size: clamp(1.85rem, 7vw, 2.4rem); }
  .home > * { padding-left: 0; padding-right: 0; }
  h1 { font-size: 1.95rem; }
  h2 { font-size: 1.4rem; }
}

/* ---- print ------------------------------------------------------- */

@media print {
  body { background: white; color: black; }
  .site-header,
  .site-footer,
  .site-nav,
  .cta-row,
  .home-hero-visual,
  .tier-diagram-wrap::before {
    display: none;
  }
  a { color: black; text-decoration: underline; }
}