:root {
  --bg: #f1f1ef;
  --bg-elevated: #fafaf8;
  --ink: #0d0d0d;
  --muted: #5a5a56;
  --line: #c8c8c2;
  --accent: #0f3d36;
  --accent-hover: #0a2a25;
  --warn-empty: #d9d9d4;
  --font-display: "Syne", sans-serif;
  --font-body: "IBM Plex Sans", sans-serif;
  --font-mono: "IBM Plex Mono", monospace;
  --shell: min(900px, calc(100% - 2.5rem));
  --space: clamp(1.25rem, 3vw, 2.5rem);
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  background:
    linear-gradient(180deg, #e8e8e4 0%, transparent 28%),
    repeating-linear-gradient(
      90deg,
      transparent,
      transparent 47px,
      rgba(13, 13, 13, 0.03) 47px,
      rgba(13, 13, 13, 0.03) 48px
    ),
    var(--bg);
  font-family: var(--font-body);
  font-size: 1.05rem;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: var(--accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
}

a:hover {
  color: var(--accent-hover);
}

.skip {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--ink);
  color: var(--bg);
  padding: 0.5rem 1rem;
  z-index: 100;
}

.skip:focus {
  left: 0;
}

.shell {
  width: var(--shell);
  margin-inline: auto;
}

.site-header {
  border-bottom: 1px solid var(--line);
  background: rgba(241, 241, 239, 0.92);
  backdrop-filter: blur(8px);
  position: sticky;
  top: 0;
  z-index: 20;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  min-height: 4rem;
}

.brand {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.35rem;
  letter-spacing: -0.03em;
  color: var(--ink);
  text-decoration: none;
}

.nav-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 0.35rem;
  align-items: stretch;
  min-height: 4rem;
}

.nav-item {
  position: relative;
  display: flex;
  align-items: center;
}

.nav-item > a {
  display: flex;
  align-items: center;
  align-self: stretch;
  padding: 0 0.85rem;
  font-family: var(--font-mono);
  font-size: 0.83rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--ink);
  text-decoration: none;
}

.nav-item > a[aria-current="page"],
.nav-sub a[aria-current="page"] {
  color: var(--accent);
}

/* Flush under the trigger — no hover gap that drops the menu.
   Open from the left edge of the item so the panel does not spill
   off-screen to the left on narrow / Android viewports. */
.nav-sub {
  display: none;
  position: absolute;
  left: 0;
  right: auto;
  top: 100%;
  width: max-content;
  min-width: 12rem;
  max-width: min(17.5rem, calc(100vw - 2rem));
  margin: 0;
  padding: 0.35rem 0;
  list-style: none;
  background: var(--bg-elevated);
  border: 1px solid var(--line);
  border-top: 0;
  box-shadow: 0 12px 28px rgba(13, 13, 13, 0.08);
  z-index: 30;
  box-sizing: border-box;
}

/* Wide layouts: nav sits on the right; hang the panel left under the trigger */
@media (min-width: 821px) {
  .nav-item.has-children > .nav-sub {
    left: auto;
    right: 0;
  }
}

.nav-item.has-children:hover > .nav-sub,
.nav-item.has-children:focus-within > .nav-sub,
.nav-item.has-children.is-open > .nav-sub {
  display: block;
}

/* Touch devices: only .is-open holds the panel (nav.js toggles on tap) */
@media (hover: none) {
  .nav-item.has-children:hover > .nav-sub,
  .nav-item.has-children:focus-within > .nav-sub {
    display: none;
  }

  .nav-item.has-children.is-open > .nav-sub {
    display: block;
  }
}

.nav-sub a {
  display: block;
  padding: 0.35rem 1.1rem;
  color: var(--ink);
  text-decoration: none;
  font-size: 0.95rem;
  line-height: 1.25;
}

.nav-sub a:hover,
.nav-sub a:focus {
  background: rgba(15, 61, 54, 0.08);
  outline: none;
}

.nav-sub-heading {
  margin: 0;
  padding: 0.45rem 1.1rem 0.15rem;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--accent);
  line-height: 1.2;
  pointer-events: none;
  user-select: none;
}

.nav-sub-heading:not(:first-child) {
  margin-top: 0.25rem;
  padding-top: 0.5rem;
  border-top: 1px solid var(--line);
}

.nav-sub .demo-flag {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--accent);
  white-space: nowrap;
}

.site-main {
  padding-block: var(--space) 4rem;
}

.project-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  column-gap: 0.85rem;
  align-items: start;
}

.project-title-row {
  display: contents;
}

.project-title-row .page-title {
  margin: 0 0 1rem;
  grid-column: 1;
}

.project-title-row .attribution-flag {
  grid-column: 2;
  margin-top: 0.35rem;
}

.page-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2rem, 5vw, 3.25rem);
  letter-spacing: -0.04em;
  line-height: 1.05;
  margin: 0 0 1rem;
}

.page-title--brand {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
}

.page-title-logo {
  width: clamp(2.25rem, 5vw, 3.25rem);
  height: clamp(2.25rem, 5vw, 3.25rem);
  object-fit: contain;
  flex-shrink: 0;
}

/* Animated bold-swarm emblem: whole mark spins; dots drift inside brackets */
.opg-emblem {
  display: block;
  overflow: visible;
}

.opg-emblem-swarm {
  position: relative;
  z-index: 1;
}

.opg-emblem-spin {
  transform-origin: 32px 32px;
  transform-box: view-box;
  animation: opg-emblem-swirl 28s linear infinite;
}

.opg-bracket-left,
.opg-bracket-right {
  transform-origin: 32px 32px;
  transform-box: view-box;
}

.opg-bracket-left {
  animation: opg-bracket-breathe-left 28s ease-in-out infinite;
}

.opg-bracket-right {
  animation: opg-bracket-breathe-right 28s ease-in-out infinite;
}

.opg-emblem-swarm .opg-dot {
  transform-box: fill-box;
  transform-origin: center;
  will-change: transform;
}

.opg-emblem-swarm .opg-dot-1 {
  animation: opg-dot-orbit-a 7s ease-in-out infinite;
}

.opg-emblem-swarm .opg-dot-2 {
  animation: opg-dot-orbit-b 9s ease-in-out infinite;
}

.opg-emblem-swarm .opg-dot-3 {
  animation: opg-dot-orbit-c 6s ease-in-out infinite;
}

.opg-emblem-swarm .opg-dot-4 {
  animation: opg-dot-orbit-d 8s ease-in-out infinite reverse;
}

.opg-emblem-swarm .opg-dot-5 {
  animation: opg-dot-orbit-a 10s ease-in-out infinite reverse;
  animation-delay: -2s;
}

@keyframes opg-emblem-swirl {
  to {
    transform: rotate(360deg);
  }
}

@keyframes opg-bracket-breathe-left {
  0%,
  100% {
    transform: translateX(3px);
  }
  25%,
  75% {
    transform: translateX(9.5px);
  }
}

@keyframes opg-bracket-breathe-right {
  0%,
  100% {
    transform: translateX(-3px);
  }
  25%,
  75% {
    transform: translateX(-9.5px);
  }
}

@keyframes opg-dot-orbit-a {
  0%,
  100% {
    transform: translate(0, 0);
  }
  25% {
    transform: translate(1.5px, -1.8px);
  }
  50% {
    transform: translate(-1.2px, 1.4px);
  }
  75% {
    transform: translate(1.6px, 1px);
  }
}

@keyframes opg-dot-orbit-b {
  0%,
  100% {
    transform: translate(0, 0);
  }
  25% {
    transform: translate(-1.8px, 1px);
  }
  50% {
    transform: translate(1.4px, -1.4px);
  }
  75% {
    transform: translate(-1px, -1.6px);
  }
}

@keyframes opg-dot-orbit-c {
  0%,
  100% {
    transform: translate(0, 0);
  }
  33% {
    transform: translate(1.2px, 1.4px);
  }
  66% {
    transform: translate(-1.4px, -1px);
  }
}

@keyframes opg-dot-orbit-d {
  0%,
  100% {
    transform: translate(0, 0);
  }
  20% {
    transform: translate(-1.4px, -1.2px);
  }
  55% {
    transform: translate(1.5px, 1px);
  }
  80% {
    transform: translate(0.6px, -1.6px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .opg-emblem-spin,
  .opg-bracket-left,
  .opg-bracket-right,
  .opg-emblem-swarm .opg-dot {
    animation: none !important;
  }
}

.attribution-flag {
  display: inline-flex;
  align-items: center;
  gap: 0.28rem;
  width: max-content;
  max-width: 100%;
  min-height: 1.5rem;
  padding: 0.12rem 0.4rem;
  border: 1px solid var(--line);
  border-radius: 2px;
  background: #fff;
  box-shadow: 0 1px 0 rgba(13, 13, 13, 0.04);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--muted);
  line-height: 1.3;
  white-space: nowrap;
  box-sizing: border-box;
}

.attribution-flag-icon {
  flex-shrink: 0;
  width: 1.15rem;
  height: 1.15rem;
  opacity: 0.9;
  transform-origin: center;
}

.attribution-flag-icon--mug {
  transform: rotate(14deg);
}

.attribution-flag--homebrewed .attribution-flag-icon {
  color: #8a5a2b;
}

.attribution-flag-icon--fork {
  transform: rotate(12deg);
}

.attribution-flag--forked .attribution-flag-icon {
  color: var(--accent);
}

.attribution-flag a {
  color: inherit;
  text-decoration: none;
}

.attribution-flag a:hover {
  color: var(--accent);
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 0.75rem;
}

.lede {
  font-size: 1.2rem;
  color: var(--muted);
  margin: 0 0 2rem;
}

.prose > *:first-child {
  margin-top: 0;
}

.prose h2,
.prose h3 {
  font-family: var(--font-display);
  letter-spacing: -0.03em;
  line-height: 1.15;
  margin-top: 2.25rem;
}

.prose h2 {
  font-size: 1.55rem;
  border-top: 1px solid var(--line);
  padding-top: 1.5rem;
}

h2.section-label,
.prose h2.section-label {
  color: var(--accent);
}

.prose h3 {
  font-size: 1.2rem;
}

.prose p,
.prose li {
  max-width: none;
}

.prose ul {
  padding-left: 1.15rem;
}

.prose code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  background: rgba(13, 13, 13, 0.05);
  padding: 0.1em 0.35em;
}

.prose pre {
  overflow-x: auto;
  background: #161616;
  color: #f2f2f0;
  padding: 1rem 1.15rem;
  border: 1px solid #2a2a2a;
  font-family: var(--font-mono);
  font-size: 0.82rem;
}

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

.cta {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  margin-top: 0.5rem;
  padding: 0.7rem 1.1rem;
  background: var(--accent);
  color: #f7f7f4;
  text-decoration: none;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  border: 1px solid var(--accent);
  transition: background 160ms ease, transform 160ms ease;
}

.cta:hover {
  background: var(--accent-hover);
  color: #fff;
  transform: translateY(-1px);
}

.cta-ghost {
  background: transparent;
  color: var(--ink);
  border-color: var(--line);
}

.cta-ghost:hover {
  background: var(--ink);
  color: var(--bg);
  border-color: var(--ink);
}

.home-hero {
  padding-block: clamp(2rem, 6vw, 4.5rem) 2rem;
  border-bottom: 1px solid var(--line);
  margin-bottom: 2.5rem;
  animation: rise 700ms ease both;
}

.home-hero .brand-mark {
  display: flex;
  align-items: center;
  gap: clamp(0.65rem, 2vw, 1.15rem);
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2.8rem, 8vw, 5.5rem);
  letter-spacing: -0.05em;
  line-height: 0.95;
  margin: 0 0 1rem;
  color: var(--ink);
}

.home-hero .brand-mark-logo {
  width: clamp(6.825rem, 17.55vw, 12.1875rem);
  height: clamp(6.825rem, 17.55vw, 12.1875rem);
  flex-shrink: 0;
  overflow: visible;
}

.home-hero .hero-line {
  max-width: 90%;
  color: var(--muted);
  font-size: 1.15rem;
  margin: 0 0 1.75rem;
}

.home-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.focus-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 0.85rem;
}

.focus-list li {
  max-width: none;
  padding: 0.9rem 0;
  border-top: 1px solid var(--line);
  display: grid;
  grid-template-columns: 11rem 1fr;
  gap: 1rem;
}

.focus-list strong {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.03em;
  text-transform: uppercase;
}

.projects-thanks {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin: .5rem 0 1.75rem;
  max-width: 50rem;
  font-size: 0.90rem;
  color: var(--muted);
}

.projects-thanks-icon {
  width: 2.5rem;
  height: 2rem;
  flex-shrink: 0;
  background: transparent;
}

.projects-thanks a {
  font-weight: 500;
}

.project-list {
  list-style: none;
  padding: 0;
  margin: 1rem 0 2.5rem;
  display: grid;
  gap: 1.25rem;
}

.project-list a {
  display: block;
  padding: 0.75rem 0;
  border-top: 1px solid var(--line);
  text-decoration: none;
  color: inherit;
  transition: padding-left 180ms ease;
}

.project-list a:hover {
  padding-left: 0.5rem;
}

.project-list h2 {
  font-family: var(--font-display);
  font-size: 1.45rem;
  margin: 0 0 0.4rem;
  border: 0;
  padding: 0;
}

.project-list h2 .demo-flag,
.project-list h2 .coming-soon,
.project-list h2 .deployed {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 500;
  letter-spacing: 0.03em;
  line-height: 1.2;
  vertical-align: middle;
}

.project-list h2 .demo-flag {
  text-transform: uppercase;
  color: var(--accent);
}

.project-list h2 .coming-soon {
  text-transform: none;
  color: var(--accent);
}

.project-list h2 .deployed {
  text-transform: none;
  color: var(--muted);
}

.project-list h2 .attribution-flag {
  margin-left: 0.35rem;
  vertical-align: middle;
  font-size: 0.62rem;
  min-height: 1.35rem;
  padding: 0.08rem 0.35rem;
}

.project-list p {
  margin: 0;
  color: var(--muted);
}

.project-list .stack {
  margin-top: 0.55rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--muted);
}

.demo-jump {
  margin: 1rem 0 0;
}

/*
  No live demo: show a thin slice of the first product screenshot
  between the hero and Agent (full-width crop, top-aligned).
*/
.project-app-slice {
  margin: 1.25rem 0 0;
  height: 160px;
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--bg-elevated);
}

.project-app-slice img {
  display: block;
  width: 100%;
  height: 160px;
  object-fit: cover;
  object-position: top center;
}

/* Shared project title + lede, then tabs */
.project-hero .lede,
.project-hero .stack,
.project-hero .demo-jump,
.project-hero .project-tabs {
  grid-column: 1 / -1;
}

.project-hero .lede {
  margin: 0 0 0.55rem;
}

.project-hero .stack {
  margin: 0 0 1.25rem;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--muted);
  letter-spacing: 0.01em;
}

.project-hero .stack + .demo-jump {
  margin-top: 0;
}

.project-hero .project-tabs {
  margin: 0.35rem 0 0;
  padding-top: 0.15rem;
  border-bottom: 2px solid var(--line);
}

.project-tabs-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.2rem 0.2rem;
}

.project-tabs-list a {
  display: inline-block;
  padding: 0.7rem 1rem 0.65rem;
  font-family: var(--font-mono);
  font-size: 0.92rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--ink);
  text-decoration: none;
  border-bottom: 3px solid transparent;
  margin-bottom: -2px;
}

.project-tabs-list a:hover {
  color: var(--accent);
}

.project-tabs-list a[aria-current="page"] {
  color: var(--accent);
  border-bottom-color: var(--accent);
  font-weight: 600;
}

.project-agent {
  margin-top: 2rem;
  scroll-margin-top: 5rem;
}

.project-agent > h2:first-child {
  margin-top: 0;
  border-top: 0;
  padding-top: 0;
}

.project-body {
  margin-top: 1.75rem;
}

/*
  Orchestration SVGs — boxes and type scale with width.
  --orch-diagram-scale from layout (default 80%). Aliases: half=40, mid=60, full=80.
  Or set diagramScale to a numeric percent on the page.
*/
.project-agent .mermaid,
.prose .mermaid {
  display: block;
  width: 100%;
  margin: 1.25rem 0;
  background: #fff;
  border: 1px solid var(--line);
  padding: 0.75rem;
  overflow-x: auto;
}

.project-agent .mermaid svg,
.prose .mermaid svg {
  display: block;
  width: var(--orch-diagram-scale, 80%) !important;
  max-width: var(--orch-diagram-scale, 80%) !important;
  min-width: 0 !important;
  height: auto !important;
  margin-inline: auto;
}

.idempotency-ledger {
  margin: 1.25rem 0 0;
  padding: 0.85rem 1rem 1rem;
  border: 1px solid var(--line);
  background: var(--bg-elevated);
  max-width: 36rem;
}

.idempotency-ledger-title {
  margin: 0 0 0.2rem;
  font-family: var(--font-display);
  font-size: 0.95rem;
  letter-spacing: -0.02em;
  font-weight: 600;
}

.idempotency-ledger-meta {
  margin: 0 0 0.75rem;
  font-size: 0.8rem;
  color: var(--muted);
}

.idempotency-ledger table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.82rem;
  margin: 0 0 0.75rem;
}

.idempotency-ledger th,
.idempotency-ledger td {
  border: 1px solid var(--line);
  padding: 0.28rem 0.45rem;
  text-align: left;
  vertical-align: top;
}

.idempotency-ledger th {
  background: rgba(13, 13, 13, 0.04);
  font-weight: 600;
}

.idempotency-ledger-fields {
  margin: 0;
  font-size: 0.8rem;
  color: var(--muted);
  line-height: 1.45;
}

.site-footer {
  border-top: 1px solid var(--line);
  padding: 1.5rem 0 2rem;
}

.footer-inner {
  display: grid;
  gap: 0.35rem;
  justify-items: center;
  text-align: center;
}

.footer-inner p {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--muted);
  letter-spacing: 0.02em;
}

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
}

.footer-legal a {
  color: var(--muted);
  text-decoration: none;
}

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

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

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.page,
.project-hero {
  animation: rise 600ms ease both;
}

@media (max-width: 820px) {
  .header-inner {
    flex-direction: column;
    align-items: flex-start;
    padding-block: 0.85rem;
  }

  .nav-list {
    flex-wrap: wrap;
    gap: 0.25rem;
    min-height: 0;
  }

  .nav-item > a {
    padding: 0.55rem 0.65rem;
  }

  /* Keep a real dropdown (not a full-width stack); JS toggles .is-open on tap */
  .nav-item.has-children {
    position: relative;
  }

  .nav-sub {
    left: 0;
    right: auto;
    max-width: min(17.5rem, calc(100vw - 2rem));
  }

  .nav-item.has-children:hover > .nav-sub,
  .nav-item.has-children:focus-within > .nav-sub {
    /* Prefer tap-to-toggle; sticky :hover / focus-within on Android is unreliable */
    display: none;
  }

  .nav-item.has-children.is-open > .nav-sub {
    display: block;
  }

  .focus-list li {
    grid-template-columns: 1fr;
    gap: 0.25rem;
  }

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

  .project-title-row .page-title,
  .project-title-row .attribution-flag {
    grid-column: 1;
  }

  .project-title-row .attribution-flag {
    margin: 0 0 0.85rem;
    justify-self: start;
    width: max-content;
  }
}