:root {
  color-scheme: dark;
  --canvas: #0B0F14;
  --ink: #F4F7FF;
  --muted: #97A3B8;
  --rule: #232B38;
  --card: #10161F;
  --raise: #1C2635;
  --cobalt: #245BFF;
  --acid: #C8FF39;
  --accent: #7DA2FF;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  --mono: ui-monospace, "SFMono-Regular", "SF Mono", Menlo, Consolas, monospace;
  --gutter: clamp(1.25rem, 4.5vw, 4rem);
  --ease: cubic-bezier(0.2, 0.7, 0.2, 1);
}

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

html { min-width: 20rem; scroll-behavior: smooth; scroll-padding-top: 5rem; }

body {
  margin: 0;
  overflow-x: clip;
  background: var(--canvas);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 1.02rem;
  line-height: 1.55;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; }

::selection { background: var(--cobalt); color: #FFFFFF; }

:focus-visible { outline: 3px solid var(--acid); outline-offset: 3px; }

.skip-link {
  position: fixed;
  z-index: 20;
  top: 0.75rem;
  left: 0.75rem;
  padding: 0.75rem 1rem;
  background: var(--cobalt);
  color: #FFFFFF;
  font-family: var(--mono);
  font-size: 0.75rem;
  font-weight: 700;
  text-decoration: none;
  transform: translateY(-160%);
}

.skip-link:focus { transform: translateY(0); }

/* Header */

.site-header {
  position: sticky;
  z-index: 10;
  top: 0;
  display: flex;
  min-height: 4rem;
  padding-inline: var(--gutter);
  border-bottom: 1px solid var(--rule);
  background: rgba(11, 15, 20, 0.86);
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  font-family: var(--mono);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}

.site-header a, footer a {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  text-decoration: none;
}

.site-header nav { display: flex; gap: clamp(0.75rem, 2.5vw, 2rem); }
.site-header nav a { color: var(--muted); }
.site-header a:hover, footer a:hover { color: var(--acid); }

main { width: min(100%, 76rem); margin-inline: auto; padding-inline: var(--gutter); }

main > section { padding-block: clamp(3.5rem, 8vw, 6.5rem); border-bottom: 1px solid var(--rule); }

.section-label, .eyebrow, .key, .when {
  margin: 0;
  font-family: var(--mono);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.section-label { color: var(--acid); }

.section-head h2 {
  max-width: 22ch;
  margin: 0.9rem 0 0;
  font-size: clamp(2rem, 4.6vw, 3.4rem);
  font-weight: 740;
  letter-spacing: -0.045em;
  line-height: 1;
}

/* Hero */

.hero {
  display: grid;
  padding-top: clamp(3rem, 8vw, 6rem);
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
  gap: clamp(2.5rem, 6vw, 6rem);
  align-items: center;
}

.eyebrow { display: inline-flex; align-items: center; gap: 0.6rem; color: var(--muted); }

.pulse {
  width: 0.55rem;
  height: 0.55rem;
  border-radius: 50%;
  background: var(--acid);
  animation: pulse 2.4s infinite var(--ease);
}

@keyframes pulse {
  0% { box-shadow: 0 0 0 0 rgba(200, 255, 57, 0.55); }
  70%, 100% { box-shadow: 0 0 0 0.6rem rgba(200, 255, 57, 0); }
}

.hero h1 {
  margin: 1.1rem 0 1.6rem;
  font-size: clamp(4.5rem, 13vw, 10.5rem);
  font-weight: 780;
  letter-spacing: -0.07em;
  line-height: 0.85;
}

.hero h1 span { color: var(--cobalt); }

.hero-intro {
  max-width: 34rem;
  margin: 0;
  font-size: clamp(1.15rem, 2vw, 1.45rem);
  line-height: 1.45;
  letter-spacing: -0.01em;
}

.hero-note {
  max-width: 34rem;
  margin: 1.4rem 0 0;
  padding-left: 1rem;
  border-left: 2px solid var(--cobalt);
  color: var(--muted);
  font-size: 0.98rem;
}

/* Phone demo */

.phone {
  display: flex;
  width: min(100%, 24rem);
  min-height: 31rem;
  margin-inline: auto;
  padding: 0.6rem;
  border: 1px solid #2E3A4C;
  border-radius: 2.4rem;
  background: #05080C;
  flex-direction: column;
  box-shadow: 1rem 1rem 0 rgba(36, 91, 255, 0.22);
}

.phone-top {
  display: flex;
  margin: 0;
  padding: 1rem 1.25rem 0.8rem;
  border-bottom: 1px solid var(--rule);
  justify-content: space-between;
  font-family: var(--mono);
  font-size: 0.66rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.phone-top span:last-child { color: var(--muted); }

.phone-thread {
  display: flex;
  padding: 1.2rem 0.9rem 0.5rem;
  flex: 1;
  flex-direction: column;
  gap: 0.55rem;
}

.msg {
  max-width: 85%;
  margin: 0;
  padding: 0.6rem 0.9rem;
  font-size: 0.95rem;
  line-height: 1.38;
  animation: msg-in 260ms var(--ease);
}

.msg.you {
  align-self: flex-end;
  border-radius: 1.1rem 1.1rem 0.25rem 1.1rem;
  background: var(--cobalt);
  color: #FFFFFF;
}

.msg.athena {
  align-self: flex-start;
  border-radius: 1.1rem 1.1rem 1.1rem 0.25rem;
  background: var(--raise);
}

@keyframes msg-in {
  from { opacity: 0; transform: translateY(0.45rem) scale(0.97); }
  to { opacity: 1; transform: none; }
}

.msg.typing { display: inline-flex; gap: 0.3rem; padding-block: 0.85rem; }

.msg.typing i {
  width: 0.42rem;
  height: 0.42rem;
  border-radius: 50%;
  background: var(--muted);
  animation: typing-bounce 1s infinite var(--ease);
}

.msg.typing i:nth-child(2) { animation-delay: 0.15s; }
.msg.typing i:nth-child(3) { animation-delay: 0.3s; }

@keyframes typing-bounce {
  0%, 60%, 100% { opacity: 0.35; transform: none; }
  30% { opacity: 1; transform: translateY(-0.2rem); }
}

.msg.voice { display: inline-flex; align-items: center; gap: 0.55rem; font-family: var(--mono); font-size: 0.85rem; }

.wave { display: inline-flex; align-items: center; gap: 0.16rem; }
.wave i { width: 0.18rem; border-radius: 0.18rem; background: currentColor; opacity: 0.85; }
.wave i:nth-child(8n + 1) { height: 0.5rem; }
.wave i:nth-child(8n + 2) { height: 0.95rem; }
.wave i:nth-child(8n + 3) { height: 0.65rem; }
.wave i:nth-child(8n + 4) { height: 1.1rem; }
.wave i:nth-child(8n + 5) { height: 0.55rem; }
.wave i:nth-child(8n + 6) { height: 0.9rem; }
.wave i:nth-child(8n + 7) { height: 0.45rem; }
.wave i:nth-child(8n) { height: 0.75rem; }

.msg.photo { padding: 0.35rem; }

.photo-frame {
  display: grid;
  width: 9rem;
  height: 6.5rem;
  padding: 0.8rem;
  border-radius: 0.85rem;
  background: #F4F7FF;
  align-content: start;
  gap: 0.45rem;
}

.photo-frame i { display: block; height: 0.4rem; border-radius: 0.2rem; background: #C5CEDD; }
.photo-frame i:nth-child(1) { width: 55%; background: #0B0F14; }
.photo-frame i:nth-child(2) { width: 90%; }
.photo-frame i:nth-child(3) { width: 75%; }
.photo-frame i:nth-child(4) { width: 35%; margin-top: 0.6rem; background: var(--cobalt); }

.phone-outcome {
  min-height: 3.6rem;
  margin: 0;
  padding: 0.4rem 1rem 0.9rem;
  color: var(--muted);
  font-size: 0.86rem;
  line-height: 1.4;
  opacity: 0;
  transition: opacity 320ms var(--ease);
}

.phone-outcome.shown { opacity: 1; }

.phone-tabs {
  display: grid;
  padding: 0.3rem;
  border-radius: 1.8rem;
  background: var(--card);
  grid-template-columns: repeat(4, 1fr);
  gap: 0.2rem;
}

.phone-tabs button {
  min-height: 48px;
  padding: 0.4rem;
  border: 0;
  border-radius: 1.5rem;
  background: transparent;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.62rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  cursor: pointer;
}

.phone-tabs button:hover { color: var(--ink); }
.phone-tabs button[aria-pressed="true"] { background: var(--acid); color: #0B0F14; }

/* Works inside */

main > .connected {
  display: flex;
  padding-block: 1.6rem;
  align-items: center;
  gap: 1.5rem;
}

.connected .section-label { flex: none; color: var(--muted); }

.connected ul {
  display: flex;
  margin: 0;
  padding: 0;
  flex-wrap: wrap;
  gap: 0.5rem 1.4rem;
  list-style: none;
  font-size: 0.95rem;
  font-weight: 600;
}

/* Day track */

.day .section-head { margin-bottom: 3rem; }

.track {
  display: grid;
  margin: 0;
  padding: 0;
  grid-template-columns: repeat(5, 1fr);
  border-top: 1px solid var(--rule);
  border-left: 1px solid var(--rule);
  counter-reset: step;
  list-style: none;
}

.track li {
  position: relative;
  min-height: 15rem;
  padding: 1.4rem 1.25rem 1.5rem;
  border-right: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
  transition: background 200ms var(--ease);
}

.track li:hover { background: var(--card); }

.track li::after {
  position: absolute;
  top: 1.4rem;
  right: 1.25rem;
  color: #3A475C;
  content: counter(step, decimal-leading-zero);
  counter-increment: step;
  font-family: var(--mono);
  font-size: 0.7rem;
  font-weight: 700;
}

.when { color: var(--accent); }

.track strong {
  display: block;
  margin: 2.2rem 0 0.5rem;
  font-size: 1.45rem;
  letter-spacing: -0.03em;
}

.track p { margin: 0; color: var(--muted); font-size: 0.93rem; }

.track li:last-child, .track li:last-child:hover { background: var(--cobalt); }
.track li:last-child .when, .track li:last-child p, .track li:last-child::after { color: rgba(255, 255, 255, 0.82); }

/* What it does */

.does { display: grid; grid-template-columns: minmax(0, 0.38fr) minmax(0, 1fr); gap: clamp(2rem, 5vw, 4rem); }

.does .section-head { position: sticky; top: 6rem; align-self: start; }

.grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-top: 1px solid var(--rule);
  border-left: 1px solid var(--rule);
}

.grid article {
  padding: 1.6rem 1.5rem 1.8rem;
  border-right: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
  transition: background 200ms var(--ease);
}

.grid article:hover { background: var(--card); }

.key { color: var(--acid); }

.grid h3 {
  margin: 0.8rem 0 0.6rem;
  font-size: 1.22rem;
  letter-spacing: -0.025em;
  line-height: 1.2;
}

.grid article p:last-child { margin: 0; color: var(--muted); font-size: 0.95rem; }

/* How it's built */

.built .section-head { margin-bottom: 3rem; }

.map {
  display: grid;
  margin-bottom: 3.5rem;
  grid-template-columns: 1fr auto 1.15fr auto 1fr;
  align-items: stretch;
}

.map-node, .map-model {
  padding: 1.3rem 1.25rem;
  border: 1px solid var(--rule);
  background: var(--card);
}

.map-node span, .map-model span { font-weight: 700; letter-spacing: -0.01em; }

.map-node p, .map-model p { margin: 0.4rem 0 0; color: var(--muted); font-size: 0.9rem; }

.map-home { border-color: var(--cobalt); background: rgba(36, 91, 255, 0.14); }

.map-link {
  display: flex;
  min-width: 6.5rem;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 0.4rem;
}

.map-link i { display: block; width: 100%; height: 1px; background: linear-gradient(90deg, var(--rule), var(--accent), var(--rule)); }

.map-link small {
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.6rem;
  font-weight: 700;
  letter-spacing: 0.07em;
  text-transform: uppercase;
}

.map-model {
  margin-top: 1rem;
  grid-column: 3;
  border-style: dashed;
  border-color: var(--accent);
  background: transparent;
}

.recipe {
  display: grid;
  margin: 0;
  padding: 0;
  grid-template-columns: repeat(4, 1fr);
  gap: 2rem;
  counter-reset: recipe;
  list-style: none;
}

.recipe li { padding-top: 1rem; border-top: 2px solid var(--ink); }

.recipe li::before {
  display: block;
  margin-bottom: 0.8rem;
  color: var(--acid);
  content: counter(recipe, decimal-leading-zero);
  counter-increment: recipe;
  font-family: var(--mono);
  font-size: 0.72rem;
  font-weight: 700;
}

.recipe h3 { margin: 0 0 0.4rem; font-size: 1.12rem; letter-spacing: -0.02em; }
.recipe p { margin: 0; color: var(--muted); font-size: 0.93rem; }

/* Rules */

.rules { display: grid; grid-template-columns: minmax(0, 0.38fr) minmax(0, 1fr); gap: clamp(2rem, 5vw, 4rem); }

.rules dl { margin: 0; border-top: 1px solid var(--rule); }

.rules dl div {
  display: grid;
  padding: 1.4rem 0;
  border-bottom: 1px solid var(--rule);
  grid-template-columns: minmax(12rem, 0.75fr) 1.25fr;
  gap: 0.4rem 2rem;
}

.rules dt { font-size: 1.1rem; font-weight: 700; letter-spacing: -0.02em; }
.rules dd { margin: 0; color: var(--muted); }

/* Inquiry */

.inquiry {
  max-width: 44rem;
  margin: 0;
  padding-block: clamp(2.5rem, 6vw, 4rem);
  color: var(--muted);
  font-size: 1.05rem;
  line-height: 1.9;
}

.inquiry a {
  padding-block: 0.7rem;
  color: var(--ink);
  text-decoration-color: var(--cobalt);
  text-decoration-thickness: 2px;
  text-underline-offset: 0.2em;
}

.inquiry a:hover { color: var(--acid); text-decoration-color: var(--acid); }

/* Footer */

footer {
  display: flex;
  width: min(100%, 76rem);
  min-height: 5.5rem;
  margin-inline: auto;
  padding-inline: var(--gutter);
  border-top: 1px solid var(--rule);
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  font-family: var(--mono);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.07em;
  text-transform: uppercase;
}

footer span { color: var(--muted); }

@media (max-width: 980px) {
  .hero { grid-template-columns: 1fr; }
  .track { grid-template-columns: repeat(2, 1fr); }
  .track li { min-height: 0; }
  .track li:last-child { grid-column: span 2; }
  .does, .rules { grid-template-columns: 1fr; }
  .does .section-head { position: static; }
  .map { grid-template-columns: 1fr; }
  .map-link { min-height: 3rem; }
  .map-link i { width: 1px; height: 1.6rem; background: linear-gradient(180deg, var(--rule), var(--accent), var(--rule)); }
  .map-model { grid-column: 1; }
  .recipe { grid-template-columns: repeat(2, 1fr); }
  main > .connected { flex-direction: column; align-items: flex-start; gap: 0.8rem; }
}

@media (max-width: 720px) {
  .site-header nav { display: none; }
  .phone { min-height: 29rem; box-shadow: 0.6rem 0.6rem 0 rgba(36, 91, 255, 0.22); }
  .track { grid-template-columns: 1fr; }
  .track li:last-child { grid-column: auto; }
  .track strong { margin-top: 1rem; }
  .grid { grid-template-columns: 1fr; }
  .recipe { grid-template-columns: 1fr; gap: 1.5rem; }
  .rules dl div { grid-template-columns: 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: 0.001ms !important; animation-duration: 0.001ms !important; animation-iteration-count: 1 !important; }
}