:root {
  --bg: #0a0e14;
  --panel: rgba(255, 255, 255, 0.035);
  --panel-2: rgba(255, 255, 255, 0.07);
  --line: rgba(255, 255, 255, 0.09);
  --line-strong: rgba(255, 255, 255, 0.18);
  --ink: #e9edf3;
  --ink-2: #9aa4b4;
  --ink-3: #6d7789;
  --teal: #5eead4;
  --teal-deep: #2dd4bf;
  --teal-dim: rgba(94, 234, 212, 0.12);
  --amber: #fbbf24;
  --red: #f87171;
  --mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, monospace;
  --sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  background-color: var(--bg);
  background-image:
    radial-gradient(900px 620px at 85% -10%, rgba(94, 234, 212, 0.10), transparent 60%),
    radial-gradient(800px 600px at -15% 30%, rgba(129, 140, 248, 0.09), transparent 60%),
    radial-gradient(700px 500px at 110% 65%, rgba(251, 191, 36, 0.05), transparent 60%),
    radial-gradient(900px 700px at 30% 110%, rgba(45, 212, 191, 0.06), transparent 60%);
  background-attachment: fixed;
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* film grain */
body::after {
  content: '';
  position: fixed;
  inset: 0;
  z-index: 60;
  pointer-events: none;
  opacity: 0.05;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2'/%3E%3C/filter%3E%3Crect width='160' height='160' filter='url(%23n)' opacity='0.6'/%3E%3C/svg%3E");
}

::selection { background: rgba(94, 234, 212, 0.3); color: #fff; }

.mono { font-family: var(--mono); }

/* scroll reveal */
.js .reveal { opacity: 0; transform: translateY(16px); transition: opacity 0.7s ease, transform 0.7s ease; }
.js .reveal.in { opacity: 1; transform: none; }

/* Nav */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(10, 14, 20, 0.72);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
}
.nav-inner {
  max-width: 880px;
  margin: 0 auto;
  padding: 14px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav-name {
  font-weight: 600;
  font-size: 15px;
  color: var(--ink);
  text-decoration: none;
  letter-spacing: -0.01em;
}
.nav-links { display: flex; gap: 26px; }
.nav-links a {
  color: var(--ink-2);
  text-decoration: none;
  font-size: 14px;
  transition: color 0.15s ease;
}
.nav-links a:hover { color: var(--teal); }
.nav-links a:focus-visible,
.nav-name:focus-visible,
.button:focus-visible,
.text-link:focus-visible,
.pill:focus-visible,
.contact-chip:focus-visible {
  outline: 2px solid var(--teal);
  outline-offset: 2px;
  border-radius: 4px;
}

main {
  max-width: 880px;
  margin: 0 auto;
  padding: 0 24px;
}

/* Hero */
.hero {
  position: relative;
  padding: 84px 0 64px;
  overflow: hidden;
}
.hero-grid {
  position: relative;
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 56px;
  align-items: center;
}
.hero-panel {
  position: relative;
  border: 1px solid var(--line-strong);
  border-radius: 18px;
  background: var(--panel);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  padding: 24px 26px 20px;
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.35);
}
.hero-panel-label {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  color: var(--teal);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 6px;
}
.hero-project {
  padding: 14px 0;
  border-top: 1px solid var(--line);
}
.hero-project-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
}
.hero-project-name { font-size: 17px; font-weight: 600; color: var(--ink); }
.hero-project-tag { font-size: 10.5px; color: var(--ink-3); letter-spacing: 0.06em; text-transform: uppercase; }
.hero-project-line {
  font-size: 14.5px;
  line-height: 1.55;
  color: var(--ink-2);
  margin: 7px 0 10px;
}
.hero-try {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-size: 12.5px;
  font-weight: 500;
  color: var(--teal);
  text-decoration: none;
  min-height: 32px;
}
.hero-try:hover { color: var(--teal-deep); }
.hero-try-arrow { transition: transform 0.2s ease; }
.hero-try:hover .hero-try-arrow { transform: translateX(3px); }
.hero-panel-note {
  font-size: 12px;
  line-height: 1.5;
  color: var(--ink-3);
  border-top: 1px solid var(--line);
  padding-top: 12px;
  margin-top: 2px;
}
.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.035) 1px, transparent 1px);
  background-size: 44px 44px;
  mask-image: radial-gradient(ellipse 90% 80% at 50% 30%, black 30%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse 90% 80% at 50% 30%, black 30%, transparent 75%);
  pointer-events: none;
}
.hero-eyebrow {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 9px;
  color: var(--teal);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 22px;
}
.live-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--teal);
  box-shadow: 0 0 12px rgba(94, 234, 212, 0.9);
  animation: pulse 2.4s ease-in-out infinite;
}
.hero h1 {
  position: relative;
  font-size: clamp(44px, 8vw, 76px);
  font-weight: 700;
  letter-spacing: -0.04em;
  line-height: 1.02;
  margin-bottom: 24px;
  background: linear-gradient(120deg, #ffffff 30%, var(--teal) 85%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.hero-summary {
  position: relative;
  font-size: 18px;
  color: var(--ink-2);
  max-width: 580px;
  margin-bottom: 14px;
}
.hero-summary strong { color: var(--ink); font-weight: 600; }
.hero-meta {
  position: relative;
  font-size: 14px;
  color: var(--ink-3);
  margin-bottom: 36px;
}
.hero-links { position: relative; display: flex; gap: 12px; flex-wrap: wrap; }

.button {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 10px 22px;
  border: 1px solid var(--line-strong);
  border-radius: 10px;
  background: var(--panel);
  color: var(--ink);
  font-size: 14px;
  font-weight: 500;
  text-decoration: none;
  transition: border-color 0.18s ease, transform 0.18s ease, box-shadow 0.18s ease;
}
.button:hover {
  border-color: rgba(94, 234, 212, 0.5);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
}
.button-primary {
  background: linear-gradient(135deg, var(--teal), var(--teal-deep));
  border-color: transparent;
  color: #06251f;
  font-weight: 600;
  box-shadow: 0 4px 22px rgba(45, 212, 191, 0.35);
}
.button-primary:hover {
  box-shadow: 0 8px 32px rgba(45, 212, 191, 0.5);
  border-color: transparent;
}

/* Sections */
.section { padding: 72px 0; border-top: 1px solid var(--line); }
.section-label {
  font-size: 13px;
  color: var(--ink-3);
  margin-bottom: 14px;
  display: flex;
  align-items: baseline;
  gap: 10px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.section-number {
  font-weight: 600;
  background: linear-gradient(120deg, var(--teal), var(--amber));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.section-intro {
  font-size: 15px;
  color: var(--ink-2);
  max-width: 620px;
  margin-bottom: 40px;
}

/* Project card */
.project-card {
  position: relative;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.05), rgba(255, 255, 255, 0.018));
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: clamp(24px, 5vw, 44px);
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.35);
  transition: transform 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
}
.project-card:hover {
  transform: translateY(-3px);
  border-color: rgba(94, 234, 212, 0.3);
  box-shadow: 0 30px 80px rgba(0, 0, 0, 0.5), 0 0 40px rgba(94, 234, 212, 0.06);
}
.project-card + .project-card { margin-top: 36px; }
.project-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 22px;
}
.project-eyebrow {
  font-size: 12px;
  color: var(--ink-3);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 8px;
}
.project-head h2 {
  font-size: clamp(28px, 4vw, 36px);
  font-weight: 700;
  letter-spacing: -0.025em;
}
.pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 15px;
  border-radius: 999px;
  background: var(--teal-dim);
  border: 1px solid rgba(94, 234, 212, 0.3);
  color: var(--teal);
  font-size: 12.5px;
  font-weight: 500;
  text-decoration: none;
  white-space: nowrap;
  transition: box-shadow 0.18s ease, border-color 0.18s ease;
}
.pill:hover { border-color: rgba(94, 234, 212, 0.6); box-shadow: 0 0 18px rgba(94, 234, 212, 0.2); }
.pill-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--teal);
  box-shadow: 0 0 10px rgba(94, 234, 212, 0.9);
  animation: pulse 2.4s ease-in-out infinite;
}
.project-lede {
  font-size: 17px;
  line-height: 1.65;
  margin-bottom: 26px;
  max-width: 640px;
  color: var(--ink);
}
.feature-list { list-style: none; margin-bottom: 34px; }
.feature-list li {
  position: relative;
  padding-left: 24px;
  margin-bottom: 13px;
  font-size: 14.5px;
  color: var(--ink-2);
  line-height: 1.65;
}
.feature-list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 9px;
  width: 8px;
  height: 8px;
  border-radius: 2px;
  background: linear-gradient(135deg, var(--teal), var(--teal-deep));
  box-shadow: 0 0 8px rgba(94, 234, 212, 0.5);
}
.feature-list code {
  font-family: var(--mono);
  font-size: 13px;
  background: var(--teal-dim);
  border: 1px solid rgba(94, 234, 212, 0.18);
  padding: 1px 6px;
  border-radius: 5px;
  color: var(--teal);
}

/* Diagrams */
.diagram {
  margin: 26px 0 10px;
  padding: 28px 12px 18px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background:
    radial-gradient(420px 260px at 50% 0%, rgba(94, 234, 212, 0.06), transparent 70%),
    rgba(255, 255, 255, 0.015);
}
.diagram svg { display: block; width: 100%; max-width: 520px; height: auto; margin: 0 auto; }
.diagram figcaption { font-size: 12px; color: var(--ink-3); text-align: center; max-width: 540px; margin: 12px auto 0; line-height: 1.6; }

/* animated flow inside diagrams */
.flow { stroke-dasharray: 7 7; animation: dashFlow 1.4s linear infinite; }
.flow-slow { stroke-dasharray: 5 5; animation: dashFlow 2.6s linear infinite; }

/* Metrics */
.metrics {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  margin-bottom: 12px;
}
.metric {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 20px 18px;
  transition: transform 0.2s ease, border-color 0.2s ease;
}
.metric:hover { transform: translateY(-2px); border-color: rgba(94, 234, 212, 0.35); }
.metric-value {
  font-size: 28px;
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.2;
  background: linear-gradient(120deg, var(--teal), #a5f3e8);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.metric-value span {
  font-size: 13px;
  font-weight: 500;
  -webkit-text-fill-color: var(--ink-3);
}
.metric-label { font-size: 13.5px; font-weight: 600; margin-top: 8px; }
.metric-sub { font-size: 11.5px; color: var(--ink-3); margin-top: 4px; }
.metrics-note { font-size: 12.5px; color: var(--ink-3); margin-bottom: 34px; }

/* Facts */
.facts > div {
  display: grid;
  grid-template-columns: 140px 1fr;
  gap: 16px;
  padding: 15px 0;
  border-top: 1px solid var(--line);
}
.facts dt { font-size: 13px; font-weight: 600; color: var(--ink-3); }
.facts dd { font-size: 14px; line-height: 1.6; }

/* Limits */
.limits {
  background: rgba(251, 191, 36, 0.045);
  border: 1px solid rgba(251, 191, 36, 0.16);
  border-left: 3px solid rgba(251, 191, 36, 0.55);
  border-radius: 12px;
  padding: 22px 24px;
  margin: 30px 0;
}
.limits-title { font-size: 13px; font-weight: 600; margin-bottom: 8px; color: var(--amber); letter-spacing: 0.03em; }
.limits p:last-child { font-size: 13.5px; color: var(--ink-2); line-height: 1.7; }

/* Project links */
.project-links { margin-top: 4px; }
.project-links-note { font-size: 13px; color: var(--ink-3); margin-top: 12px; max-width: 600px; line-height: 1.65; }
.text-link {
  color: var(--teal);
  font-weight: 500;
  font-size: 15px;
  text-decoration: none;
  background-image: linear-gradient(var(--teal), var(--teal));
  background-size: 100% 1px;
  background-position: 0 100%;
  background-repeat: no-repeat;
  transition: background-size 0.2s ease, text-shadow 0.2s ease;
  padding-bottom: 2px;
}
.text-link:hover { background-size: 0 1px; text-shadow: 0 0 14px rgba(94, 234, 212, 0.6); }

/* Pipeline */
.pipeline-list { border-top: 1px solid var(--line); }
.pipeline-item {
  position: relative;
  display: grid;
  grid-template-columns: 52px 1fr auto;
  gap: 18px;
  align-items: baseline;
  padding: 24px 0;
  border-bottom: 1px solid var(--line);
}
.pipeline-number {
  font-size: 15px;
  font-weight: 600;
  background: linear-gradient(120deg, var(--teal), var(--amber));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.pipeline-name { font-size: 16px; font-weight: 600; margin-bottom: 4px; }
.pipeline-detail { font-size: 14px; color: var(--ink-2); line-height: 1.6; max-width: 520px; }
.pipeline-status {
  font-size: 11.5px;
  color: var(--amber);
  border: 1px solid rgba(251, 191, 36, 0.3);
  background: rgba(251, 191, 36, 0.07);
  border-radius: 999px;
  padding: 4px 11px;
  white-space: nowrap;
}

/* About */
.about-text { font-size: 17px; line-height: 1.7; margin-bottom: 30px; max-width: 640px; color: var(--ink-2); }
.about-text strong { color: var(--ink); font-weight: 600; }

/* Contact */
.section-contact { padding-bottom: 90px; }
.contact-heading {
  font-size: clamp(32px, 5vw, 46px);
  font-weight: 700;
  letter-spacing: -0.03em;
  margin-bottom: 30px;
  background: linear-gradient(120deg, #ffffff 40%, var(--teal));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.contact-links { display: flex; flex-direction: column; gap: 12px; align-items: flex-start; }
.contact-chip {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 11px 18px;
  border: 1px solid var(--line-strong);
  border-radius: 10px;
  background: var(--panel);
  color: var(--ink);
  font-family: var(--mono);
  font-size: 13.5px;
  text-decoration: none;
  transition: border-color 0.18s ease, transform 0.18s ease, box-shadow 0.18s ease;
}
.contact-chip:hover {
  border-color: rgba(94, 234, 212, 0.5);
  transform: translateX(4px);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.35);
}
.contact-chip .arrow { color: var(--teal); }

/* Footer */
.footer { border-top: 1px solid var(--line); padding: 36px 24px 52px; text-align: center; }
.footer p { font-size: 12.5px; color: var(--ink-3); max-width: 600px; margin: 0 auto; line-height: 1.7; }

/* Animations */
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.35; }
}
@keyframes nodePulse {
  0%, 100% { opacity: 0.9; }
  50% { opacity: 0.3; }
}
@keyframes dashFlow {
  to { stroke-dashoffset: -14; }
}

/* Responsive */
@media (max-width: 900px) {
  .hero-grid { grid-template-columns: 1fr; gap: 40px; }
}
@media (max-width: 640px) {
  .hero { padding: 56px 0 48px; }
  .section { padding: 52px 0; }
  .metrics { grid-template-columns: repeat(2, 1fr); }
  .facts > div { grid-template-columns: 1fr; gap: 4px; }
  .pipeline-item { grid-template-columns: 40px 1fr; }
  .pipeline-status { grid-column: 2; justify-self: start; }
  .nav-links { gap: 16px; }
  .nav-links a { display: inline-flex; align-items: center; min-height: 44px; }
}

/* Diagram mobile fallback: stacked legible cards below 640px */
.diagram-steps { display: none; }
.dstep { border: 1px solid var(--line-strong); border-radius: 10px; background: var(--panel-2); padding: 10px 14px; }
.dstep.tint { background: var(--teal-dim); border-color: rgba(94, 234, 212, 0.3); }
.dstep.deny { border-color: rgba(248, 113, 113, 0.5); background: rgba(248, 113, 113, 0.07); }
.dstep.deny .dstep-sub { color: var(--red); }
.dstep-tag { font-size: 10.5px; font-weight: 600; color: var(--teal); margin-bottom: 4px; }
.dstep-title { font-size: 14px; font-weight: 600; }
.dstep-sub { font-size: 11.5px; color: var(--ink-3); margin-top: 3px; }
.darrow { text-align: center; font-family: var(--mono); font-size: 11px; color: var(--ink-3); padding: 5px 0; }
.dnote { text-align: center; font-size: 11px; color: var(--teal); margin-top: 10px; }
@media (max-width: 640px) {
  .diagram svg { display: none; }
  .diagram-steps { display: block; max-width: 360px; margin: 0 auto; }
}

/* Reduced motion: everything visible and still */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
  .js .reveal { opacity: 1; transform: none; }
}

/* Plain-language hook + primary CTA (instant comprehension layer) */
.hook {
  font-size: clamp(17px, 2.4vw, 20px);
  line-height: 1.55;
  font-weight: 500;
  color: var(--ink);
  max-width: 620px;
  margin: -8px 0 8px;
  padding-left: 16px;
  border-left: 3px solid;
  border-image: linear-gradient(180deg, var(--teal), var(--amber)) 1;
}
.try-row {
  display: flex;
  align-items: center;
  gap: 18px;
  flex-wrap: wrap;
  margin: 20px 0 34px;
}
.try-note { font-size: 13px; color: var(--ink-3); max-width: 400px; line-height: 1.6; }
.detail-label {
  font-size: 11.5px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--teal);
  margin-bottom: 18px;
  padding-top: 24px;
  border-top: 1px solid var(--line);
}

/* Keep contribution heading clear of the sticky navigation. */
#open-source { scroll-margin-top: 88px; }
#open-source article + article { margin-top: 48px; padding-top: 36px; border-top: 1px solid var(--line); }