:root {
  --bg: #070809;
  --surface-0: #0b0c0e;
  --surface: #131417;
  --surface-2: #1b1d21;
  --surface-3: #25282d;
  --line: #2e3238;
  --ink: #eceef0;
  --muted: #9aa0a8;
  --signal: #d4ff3f;
  --signal-ink: #0b0c0e;
  --data: #5be3e8;
  --max: 1120px;
  --font: "IBM Plex Sans", "Segoe UI", sans-serif;
  --display: "Space Grotesk", "IBM Plex Sans", sans-serif;
  --mono: "IBM Plex Mono", Consolas, monospace;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  font: 400 16px/1.55 var(--font);
  background: var(--bg);
  overflow-x: hidden;
}

.atmosphere {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(ellipse 90% 55% at 70% -5%, rgba(212, 255, 63, 0.09), transparent 55%),
    radial-gradient(ellipse 50% 40% at 10% 30%, rgba(91, 227, 232, 0.04), transparent 50%),
    linear-gradient(180deg, #0b0c0e 0%, var(--bg) 40%, #050607 100%);
}
.atmosphere::after {
  content: "";
  position: absolute;
  inset: 0;
  opacity: 0.35;
  background-image:
    linear-gradient(rgba(46, 50, 56, 0.35) 1px, transparent 1px),
    linear-gradient(90deg, rgba(46, 50, 56, 0.35) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(ellipse 70% 60% at 50% 20%, #000 20%, transparent 75%);
}

.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}

a { color: var(--signal); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }
img { display: block; max-width: 100%; }
code {
  font: 500 0.9em var(--mono);
  color: var(--data);
}

h1, h2, h3 { font-family: var(--display); letter-spacing: -0.02em; line-height: 1.08; }
h1 { font-size: clamp(2.4rem, 6vw, 4.2rem); font-weight: 700; margin: 0 0 1rem; }
h2 { font-size: clamp(1.75rem, 3.4vw, 2.55rem); font-weight: 700; margin: 0 0 0.75rem; }
h3 { font-size: 1.05rem; margin: 0 0 0.4rem; }
p { margin: 0 0 1rem; color: var(--muted); }
kbd {
  font: 500 0.85em var(--mono);
  padding: 0.12em 0.4em;
  border: 1px solid var(--line);
  border-radius: 3px;
  background: var(--surface-2);
  color: var(--ink);
}

/* —— Nav —— */
.nav {
  position: sticky; top: 0; z-index: 40;
  display: flex; align-items: center; gap: 1rem;
  max-width: calc(var(--max) + 2.5rem);
  margin: 0 auto;
  padding: 0.85rem 1.25rem;
  background: rgba(7, 8, 9, 0.72);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.35s var(--ease), background 0.35s var(--ease);
}
.nav.is-scrolled { border-bottom-color: var(--line); background: rgba(7, 8, 9, 0.9); }
.brand {
  display: inline-flex; align-items: center; gap: 0.55rem;
  color: var(--ink); font: 700 0.95rem var(--display); letter-spacing: 0.06em;
  text-decoration: none; z-index: 2;
}
.brand img {
  width: 28px; height: 28px;
  transition: transform 0.45s var(--ease);
}
.brand:hover { text-decoration: none; }
.brand:hover img { transform: rotate(-8deg) scale(1.06); }

.nav-links {
  display: flex; gap: 0.15rem 1.15rem; flex: 1; justify-content: center;
}
.nav-links a {
  position: relative;
  color: var(--muted); font-size: 0.92rem; text-decoration: none;
  padding: 0.35rem 0;
}
.nav-links a::after {
  content: "";
  position: absolute; left: 0; right: 100%; bottom: 0; height: 1px;
  background: var(--signal);
  transition: right 0.35s var(--ease);
}
.nav-links a:hover { color: var(--ink); text-decoration: none; }
.nav-links a:hover::after,
.nav-links a.is-active::after { right: 0; }
.nav-links a.is-active { color: var(--ink); }

.nav-toggle {
  display: none;
  margin-left: auto;
  width: 40px; height: 40px;
  border: 1px solid var(--line);
  background: var(--surface);
  cursor: pointer;
  position: relative;
}
.nav-toggle-bar,
.nav-toggle-bar::before,
.nav-toggle-bar::after {
  content: "";
  position: absolute; left: 10px; right: 10px; height: 1.5px;
  background: var(--ink);
  transition: transform 0.3s var(--ease), opacity 0.2s;
}
.nav-toggle-bar { top: 19px; }
.nav-toggle-bar::before { top: -7px; }
.nav-toggle-bar::after { top: 7px; }
.nav.is-open .nav-toggle-bar { background: transparent; }
.nav.is-open .nav-toggle-bar::before { top: 0; transform: rotate(45deg); }
.nav.is-open .nav-toggle-bar::after { top: 0; transform: rotate(-45deg); }

.btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 0.72rem 1.15rem; border-radius: 2px;
  font: 600 0.92rem var(--font);
  text-decoration: none; border: 1px solid transparent;
  white-space: nowrap;
  transition: transform 0.25s var(--ease), background 0.25s, border-color 0.25s, color 0.25s;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn:active { transform: translateY(0); }
.btn-primary { background: var(--signal); color: var(--signal-ink); }
.btn-primary:hover { background: #e2ff6a; }
.btn-ghost { border-color: var(--line); color: var(--ink); background: transparent; }
.btn-ghost:hover { border-color: var(--muted); }
.btn-dark { background: var(--signal-ink); color: var(--signal); }
.btn-dark-ghost { background: transparent; color: var(--signal-ink); border-color: var(--signal-ink); }

/* —— Hero: one composition —— */
.hero {
  max-width: var(--max);
  margin: 0 auto;
  padding: clamp(2.5rem, 8vh, 5rem) 1.25rem 3rem;
  min-height: calc(100vh - 72px);
  display: flex;
  align-items: center;
}
.hero-stage { max-width: 40rem; }
.eyebrow {
  display: inline-block;
  margin: 0 0 1.1rem;
  padding: 0.35rem 0.65rem;
  border: 1px solid color-mix(in srgb, var(--signal) 40%, transparent);
  color: var(--signal);
  font: 500 0.75rem/1 var(--mono);
  letter-spacing: 0.04em;
}
.brand-line {
  display: block;
  font-size: clamp(3rem, 8vw, 5.5rem);
  line-height: 0.92;
  letter-spacing: -0.03em;
  color: var(--signal);
  margin-bottom: 0.35rem;
}
.hero-title { display: block; color: var(--ink); }
.lede { font-size: 1.05rem; max-width: 34rem; margin-bottom: 0; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 0.75rem; margin-top: 1.6rem; }

.spec-band {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 1.25rem 3rem;
}
.spec-row {
  list-style: none; margin: 0; padding: 0;
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 0.65rem;
  border-top: 1px solid var(--line);
  padding-top: 1.5rem;
}
.spec-row li {
  padding: 0.85rem 0.15rem 0;
  display: flex; flex-direction: column; gap: 0.3rem;
  border-top: 2px solid transparent;
  transition: border-color 0.35s var(--ease);
}
.spec-row li:hover { border-top-color: var(--signal); }
.spec-k { font: 500 0.68rem var(--mono); letter-spacing: 0.1em; color: var(--signal); }
.spec-row strong { font: 700 1.02rem var(--display); color: var(--ink); }
.spec-row span:last-child { font-size: 0.84rem; color: var(--muted); }

.section, .cta, .footer {
  max-width: var(--max); margin: 0 auto; padding: 3.75rem 1.25rem;
}
.section-head { max-width: 36rem; margin-bottom: 1.85rem; }

.effects-layout {
  display: grid;
  grid-template-columns: minmax(240px, 300px) 1fr;
  gap: 1.5rem;
  align-items: start;
}
.stack-panel {
  background: var(--surface);
  border: 1px solid var(--line);
  padding: 0.45rem;
}
.stack-row, .stack-total {
  display: grid; grid-template-columns: auto 1fr auto; gap: 0.75rem;
  align-items: center; padding: 0.62rem 0.7rem;
  font-size: 0.92rem;
  border: 1px solid transparent;
  transition: background 0.3s, border-color 0.3s;
}
.stack-row.active {
  border-color: var(--signal);
  background: var(--surface-2);
}
.stack-panel.is-in .stack-row {
  animation: stack-in 0.55s var(--ease) both;
  animation-delay: calc(var(--i, 0) * 70ms + 80ms);
}
.stack-total { border-top: 1px solid var(--line); margin-top: 0.2rem; color: var(--muted); }
.dot {
  width: 13px; height: 13px; border-radius: 50%;
  border: 2px solid var(--line);
}
.dot.on {
  border-color: var(--signal);
  background: var(--signal);
  box-shadow: inset 0 0 0 2px var(--signal-ink);
}
.ms { font: 400 0.84rem var(--mono); color: var(--data); }

.feature-grid {
  display: grid; grid-template-columns: repeat(2, 1fr); gap: 0.75rem;
}
.feature-grid article, .roadmap article {
  background: var(--surface);
  border: 1px solid var(--line);
  padding: 1.1rem 1.15rem;
  transition: border-color 0.3s var(--ease), transform 0.3s var(--ease);
}
.feature-grid article:hover, .roadmap article:hover {
  border-color: color-mix(in srgb, var(--signal) 35%, var(--line));
  transform: translateY(-2px);
}
.feature-grid p, .roadmap p, .faq-item p { margin: 0; font-size: 0.92rem; }

.steps {
  list-style: none; margin: 0; padding: 0;
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 0.75rem;
  counter-reset: none;
}
.steps li {
  background: var(--surface);
  border: 1px solid var(--line);
  padding: 1.3rem 1.2rem;
  position: relative;
  overflow: hidden;
}
.steps li::before {
  content: "";
  position: absolute; left: 0; top: 0; bottom: 0; width: 2px;
  background: var(--signal);
  transform: scaleY(0);
  transform-origin: top;
  transition: transform 0.5s var(--ease);
}
.steps li.is-in::before,
.reveal.is-in.steps li::before { transform: scaleY(1); }
.step-n { font: 500 0.78rem var(--mono); color: var(--signal); display: block; margin-bottom: 0.65rem; }

.split {
  display: grid; grid-template-columns: 1.15fr 0.85fr; gap: 2rem; align-items: start;
}
.status-list { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 0.45rem; }
.status-list li {
  display: flex; justify-content: space-between; gap: 1rem; align-items: center;
  padding: 0.72rem 0.85rem;
  background: var(--surface); border: 1px solid var(--line);
  font-size: 0.92rem;
  transition: border-color 0.25s;
}
.status-list li:hover { border-color: var(--surface-3); }
.tag {
  font: 500 0.7rem var(--mono); padding: 0.2rem 0.45rem;
  border: 1px solid var(--line); color: var(--muted); text-transform: lowercase;
  flex: none;
}
.tag-now { border-color: color-mix(in srgb, var(--signal) 45%, var(--line)); color: var(--signal); }
.tag-dev { border-color: color-mix(in srgb, var(--data) 55%, var(--line)); color: var(--data); }
.footnote { grid-column: 1 / -1; font-size: 0.86rem; color: var(--muted); margin: 0; }

.roadmap {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(210px, 1fr)); gap: 0.7rem;
}
.roadmap .tag { display: inline-block; margin-bottom: 0.5rem; }

.meta { margin: 0; display: flex; flex-direction: column; gap: 0.5rem; }
.meta > div {
  display: grid; grid-template-columns: 6.5rem 1fr; gap: 0.75rem;
  padding: 0.65rem 0.8rem; background: var(--surface); border: 1px solid var(--line);
  font-size: 0.92rem;
}
.meta dt { color: var(--muted); font-family: var(--mono); font-size: 0.75rem; }
.meta dd { margin: 0; }

/* FAQ accordion */
.faq-list { display: flex; flex-direction: column; gap: 0.5rem; max-width: 720px; }
.faq-item {
  background: var(--surface);
  border: 1px solid var(--line);
  padding: 0;
}
.faq-item summary {
  list-style: none;
  cursor: pointer;
  padding: 1rem 1.15rem;
  font: 600 1rem var(--display);
  display: flex; justify-content: space-between; align-items: center; gap: 1rem;
  transition: color 0.2s;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
  content: "+";
  font: 500 1.2rem var(--mono);
  color: var(--signal);
  transition: transform 0.3s var(--ease);
}
.faq-item[open] summary::after { transform: rotate(45deg); }
.faq-item[open] summary { color: var(--ink); }
.faq-item p { padding: 0 1.15rem 1.1rem; }

.cta { padding-top: 1rem; padding-bottom: 4rem; }
.cta-inner {
  background: var(--signal);
  color: var(--signal-ink);
  padding: clamp(1.85rem, 4vw, 2.85rem);
  display: flex; flex-direction: column; gap: 0.65rem;
  position: relative;
  overflow: hidden;
}
.cta-inner::before {
  content: "";
  position: absolute;
  right: -8%; top: -40%;
  width: 280px; height: 280px;
  border: 40px solid rgba(11, 12, 14, 0.08);
  transform: rotate(18deg);
  pointer-events: none;
}
.cta-inner h2 { color: var(--signal-ink); margin: 0; position: relative; }
.cta-inner p {
  color: color-mix(in srgb, var(--signal-ink) 78%, transparent);
  margin: 0; position: relative; max-width: 36rem;
}
.cta-actions { display: flex; gap: 0.75rem; flex-wrap: wrap; margin-top: 0.55rem; position: relative; }

.footer {
  display: flex; justify-content: space-between; gap: 2rem; flex-wrap: wrap;
  border-top: 1px solid var(--line);
  padding-top: 2rem; padding-bottom: 3rem;
}
.footer-brand { display: flex; gap: 0.85rem; max-width: 36rem; align-items: flex-start; }
.footer-brand p { margin: 0; font-size: 0.86rem; }
.footer-links { display: flex; gap: 1.25rem; align-items: flex-start; flex-wrap: wrap; }
.footer-links a { color: var(--muted); }

/* —— Motion —— */
.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
  transition-delay: calc(var(--d, 0) * 70ms);
}
.reveal.is-in {
  opacity: 1;
  transform: none;
}

@keyframes stack-in {
  from { opacity: 0; transform: translateX(-10px); }
  to { opacity: 1; transform: none; }
}

@keyframes hero-mark {
  from { opacity: 0; transform: translateY(12px) skewX(-4deg); }
  to { opacity: 1; transform: none; }
}
.brand-line {
  animation: hero-mark 0.9s var(--ease) both;
}

@media (max-width: 960px) {
  .hero {
    min-height: auto;
    padding-top: 2rem;
  }
  .effects-layout, .split, .steps, .feature-grid, .spec-row {
    grid-template-columns: 1fr;
  }
  .nav-cta { display: none; }
  .nav-toggle { display: block; }
  .nav-links {
    display: none;
    position: absolute;
    left: 0; right: 0; top: 100%;
    flex-direction: column;
    gap: 0;
    padding: 0.5rem 1.25rem 1rem;
    background: rgba(11, 12, 14, 0.97);
    border-bottom: 1px solid var(--line);
  }
  .nav.is-open .nav-links { display: flex; }
  .nav-links a { padding: 0.75rem 0; border-bottom: 1px solid var(--line); }
}

/* —— Inner pages (download / docs / contribute / AI) —— */
/* Reuse .section for width/padding so layout matches the landing page. */
.page-shell.section {
  padding-top: 2rem;
  padding-bottom: 4rem;
}
.page-hero {
  display: block;
  width: 100%;
  max-width: 40rem;
  padding: 1.25rem 0 2rem;
  border-bottom: 1px solid var(--line);
  margin: 0 0 2.25rem;
  position: relative;
}
.page-hero::after {
  content: "";
  position: absolute;
  left: 0; bottom: -1px;
  width: min(12rem, 40%);
  height: 2px;
  background: var(--signal);
}
.page-hero .eyebrow { margin-bottom: 0.85rem; }
.page-hero h1 {
  font-size: clamp(2rem, 4.5vw, 3.1rem);
  margin: 0 0 0.75rem;
}
.page-hero .lede { margin: 0; max-width: 38rem; }
.page-hero .brand-word {
  color: var(--signal);
  font-family: var(--display);
  font-weight: 700;
  letter-spacing: 0.04em;
}

.prose {
  display: block;
  width: 100%;
  max-width: 44rem;
}
.prose h2 {
  font-size: clamp(1.35rem, 2.4vw, 1.7rem);
  margin: 2.25rem 0 0.75rem;
}
.prose h3 {
  font-size: 1.05rem;
  margin: 1.5rem 0 0.45rem;
  color: var(--ink);
}
.prose ul, .prose ol {
  margin: 0 0 1.1rem;
  padding-left: 1.2rem;
  color: var(--muted);
}
.prose li { margin: 0.35rem 0; }
.prose li::marker { color: var(--signal); }
.prose strong { color: var(--ink); font-weight: 600; }
.prose hr {
  border: 0;
  border-top: 1px solid var(--line);
  margin: 2rem 0;
}
.prose pre, .code-block {
  display: block;
  margin: 0 0 1.15rem;
  padding: 0.95rem 1.05rem;
  background: var(--surface);
  border: 1px solid var(--line);
  border-left: 2px solid var(--signal);
  overflow-x: auto;
  font: 500 0.82rem/1.5 var(--mono);
  color: var(--ink);
  white-space: pre;
}
.prose table {
  width: 100%;
  border-collapse: collapse;
  margin: 0 0 1.25rem;
  font-size: 0.92rem;
}
.prose th, .prose td {
  text-align: left;
  padding: 0.55rem 0.65rem;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}
.prose th {
  color: var(--muted);
  font: 500 0.72rem var(--mono);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.prose td { color: var(--muted); }
.prose td:first-child { color: var(--ink); }

/* Doc index cards — same grid language as .feature-grid */
.doc-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.75rem;
  width: 100%;
  margin: 0 0 2.5rem;
  list-style: none;
  padding: 0;
}
a.doc-link {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  padding: 1.15rem 1.2rem;
  background: var(--surface);
  border: 1px solid var(--line);
  border-left: 2px solid var(--line);
  text-decoration: none;
  color: var(--ink);
  min-height: 5.5rem;
  transition: border-color 0.25s var(--ease), transform 0.25s var(--ease), background 0.25s;
}
a.doc-link:hover {
  text-decoration: none;
  border-left-color: var(--signal);
  border-color: var(--line);
  background: var(--surface-2);
  transform: translateY(-1px);
  color: var(--ink);
}
a.doc-link strong {
  display: block;
  font: 600 1.02rem var(--display);
  color: var(--ink);
  margin: 0;
}
a.doc-link span {
  display: block;
  color: var(--muted);
  font-size: 0.9rem;
  line-height: 1.45;
}

.steps-inline {
  counter-reset: step;
  list-style: none;
  padding: 0;
  margin: 1.25rem 0 2rem;
  width: 100%;
  max-width: 44rem;
}
.steps-inline li {
  position: relative;
  display: block;
  padding: 1rem 0 1rem 3.25rem;
  border-bottom: 1px solid var(--line);
  color: var(--muted);
}
.steps-inline li::before {
  counter-increment: step;
  content: counter(step, decimal-leading-zero);
  position: absolute;
  left: 0; top: 1rem;
  font: 700 0.95rem var(--mono);
  color: var(--signal);
}
.steps-inline strong {
  color: var(--ink);
  display: block;
  margin-bottom: 0.25rem;
  font-family: var(--display);
}

.callout {
  display: block;
  margin: 1.5rem 0;
  padding: 1.1rem 1.2rem;
  max-width: 44rem;
  background: color-mix(in srgb, var(--signal) 8%, var(--surface));
  border: 1px solid color-mix(in srgb, var(--signal) 35%, var(--line));
}
.callout p { margin: 0; color: var(--ink); }
.callout.reject {
  background: color-mix(in srgb, #ff5a5a 8%, var(--surface));
  border-color: color-mix(in srgb, #ff5a5a 35%, var(--line));
}

.page-actions {
  display: flex; flex-wrap: wrap; gap: 0.75rem;
  margin: 1.5rem 0 0;
}

.version-chip {
  display: inline-flex; align-items: center; gap: 0.5rem;
  font: 500 0.8rem var(--mono);
  color: var(--data);
  margin-bottom: 1rem;
}
.version-chip::before {
  content: "";
  width: 6px; height: 6px;
  background: var(--signal);
  border-radius: 1px;
}

.page-shell .footer {
  margin-top: 2rem;
  padding-left: 0;
  padding-right: 0;
}

@media (max-width: 720px) {
  .doc-grid { grid-template-columns: 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal, .brand-line, .stack-panel.is-in .stack-row {
    animation: none !important;
    transition: none !important;
    opacity: 1 !important;
    transform: none !important;
  }
  .btn:hover, .feature-grid article:hover, .roadmap article:hover, .doc-link:hover {
    transform: none;
  }
}