:root {
  color-scheme: dark;
  --canvas: #0B0F14;
  --ink: #F4F7FF;
  --muted: #97A3B8;
  --rule: #232B38;
  --card: #10161F;
  --raise: #1C2635;
  --cobalt: #245BFF;
  --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; }

body {
  margin: 0;
  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(--accent); outline-offset: 3px; }

.skip-link {
  position: fixed;
  z-index: 10;
  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); }

.site-header,
footer {
  display: flex;
  width: min(100%, 74rem);
  min-height: 4.5rem;
  margin-inline: auto;
  padding-inline: var(--gutter);
  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;
}

.site-header { border-bottom: 1px solid var(--rule); }
.site-header span, footer span { color: var(--muted); }
.site-header a, footer a { display: inline-flex; min-height: 44px; align-items: center; text-decoration: none; }
.site-header a:hover, footer a:hover { color: var(--accent); }

main { width: min(100%, 74rem); margin-inline: auto; padding-inline: var(--gutter); }

main section { padding-block: clamp(3.25rem, 7vw, 5.5rem); border-bottom: 1px solid var(--rule); }

.hero {
  display: grid;
  padding-top: clamp(3.5rem, 8vw, 6rem);
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  gap: clamp(2.5rem, 5vw, 5rem);
  align-items: center;
}

.eyebrow,
.section-label {
  margin: 0;
  color: var(--accent);
  font-family: var(--mono);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.hero h1 {
  margin: 1.25rem 0 1.5rem;
  font-size: clamp(4.25rem, 9vw, 7.5rem);
  font-weight: 760;
  letter-spacing: -0.06em;
  line-height: 0.9;
}

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

.hero-intro {
  max-width: 36rem;
  margin: 0;
  font-size: clamp(1.15rem, 1.9vw, 1.4rem);
  line-height: 1.5;
}

.hero-note { max-width: 36rem; margin: 1.25rem 0 0; color: var(--muted); font-size: 1rem; }

/* Interactive demo */

.demo {
  display: flex;
  min-height: 27rem;
  border: 1px solid var(--rule);
  background: var(--card);
  flex-direction: column;
  box-shadow: 1.25rem 1.25rem 0 rgba(36, 91, 255, 0.16);
}

.demo-top {
  display: flex;
  margin: 0;
  padding: 0.85rem 1.25rem;
  border-bottom: 1px solid var(--rule);
  align-items: center;
  gap: 0.6rem;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.66rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.demo-dot { width: 0.55rem; height: 0.55rem; border-radius: 50%; background: var(--cobalt); }

.demo-thread {
  display: flex;
  padding: 1.4rem 1.25rem 0.5rem;
  flex: 1;
  flex-direction: column;
  gap: 0.6rem;
}

.msg {
  max-width: 85%;
  margin: 0;
  padding: 0.65rem 0.95rem;
  font-size: 0.98rem;
  line-height: 1.4;
  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; }

.demo-outcome {
  min-height: 3rem;
  margin: 0;
  padding: 0.4rem 1.25rem 1rem;
  color: var(--muted);
  font-size: 0.9rem;
  opacity: 0;
  transition: opacity 320ms var(--ease);
}

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

.demo-tabs { display: grid; border-top: 1px solid var(--rule); grid-template-columns: repeat(4, 1fr); }

.demo-tabs button {
  min-height: 48px;
  padding: 0.5rem;
  border: 0;
  border-right: 1px solid var(--rule);
  background: transparent;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.64rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  cursor: pointer;
}

.demo-tabs button:last-child { border-right: 0; }
.demo-tabs button:hover { color: var(--ink); }
.demo-tabs button[aria-pressed="true"] { background: var(--cobalt); color: #FFFFFF; }

/* Sections */

section h2 {
  max-width: 24ch;
  margin: 1rem 0 2.5rem;
  font-size: clamp(1.9rem, 4.4vw, 3rem);
  font-weight: 730;
  letter-spacing: -0.04em;
  line-height: 1.02;
}

/* Day loop */

.loop {
  position: relative;
  display: grid;
  margin: 0;
  padding: 0;
  grid-template-columns: repeat(5, 1fr);
  gap: 2rem;
  list-style: none;
}

.loop::before {
  position: absolute;
  top: 0.42rem;
  right: 0;
  left: 0;
  height: 1px;
  background: var(--rule);
  content: "";
}

.loop li { position: relative; padding-top: 1.7rem; }

.loop li::before {
  position: absolute;
  top: 0;
  left: 0;
  width: 0.85rem;
  height: 0.85rem;
  border: 2px solid var(--accent);
  border-radius: 50%;
  background: var(--canvas);
  content: "";
}

.loop li:last-child::before { border-color: var(--cobalt); background: var(--cobalt); }

.loop span {
  color: var(--accent);
  font-family: var(--mono);
  font-size: 0.66rem;
  font-weight: 700;
  letter-spacing: 0.07em;
  text-transform: uppercase;
}

.loop strong { display: block; margin: 0.25rem 0 0.35rem; font-size: 1.15rem; letter-spacing: -0.02em; }
.loop p { margin: 0; color: var(--muted); font-size: 0.92rem; }

/* Capability ledger */

.ledger { border-top: 1px solid var(--rule); }

.ledger article {
  display: grid;
  padding: 1.75rem 0;
  border-bottom: 1px solid var(--rule);
  grid-template-columns: 11rem 1fr;
  gap: 1.25rem 2.5rem;
  align-items: start;
}

.ledger .key {
  margin: 0.35rem 0 0;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.07em;
  text-transform: uppercase;
}

.ledger .key em {
  display: inline-block;
  margin-left: 0.4rem;
  padding: 0.15rem 0.4rem;
  background: var(--cobalt);
  color: #FFFFFF;
  font-size: 0.6rem;
  font-style: normal;
}

.ledger h3 { margin: 0 0 0.5rem; font-size: clamp(1.25rem, 2.4vw, 1.6rem); letter-spacing: -0.025em; line-height: 1.15; }
.ledger div > p { max-width: 46rem; margin: 0; color: var(--muted); }

/* System map */

.map {
  display: grid;
  margin: 0 0 3rem;
  grid-template-columns: 1fr auto 1.15fr auto 1fr;
  gap: 0.85rem 0.5rem;
}

.map-node { padding: 1.1rem 1.2rem; border: 1px solid var(--rule); background: var(--card); }

.map-node span {
  color: var(--accent);
  font-family: var(--mono);
  font-size: 0.66rem;
  font-weight: 700;
  letter-spacing: 0.07em;
  text-transform: uppercase;
}

.map-node p { margin: 0.4rem 0 0; color: var(--muted); font-size: 0.92rem; }

.map-home { border-color: var(--cobalt); }
.map-drop, .map-model { grid-column: 3; }

.map-link, .map-drop { display: grid; padding-inline: 0.4rem; place-items: center; text-align: center; }
.map-link i, .map-drop i { color: var(--accent); font-size: 1.25rem; font-style: normal; }
.map-link small, .map-drop small { color: var(--muted); font-family: var(--mono); font-size: 0.58rem; letter-spacing: 0.05em; text-transform: uppercase; }

/* Recipe */

.recipe-list {
  display: grid;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--rule);
  counter-reset: step;
  list-style: none;
}

.recipe-list li {
  display: grid;
  padding: 1.4rem 0;
  border-bottom: 1px solid var(--rule);
  grid-template-columns: 3.5rem 1fr;
  gap: 0 1rem;
  counter-increment: step;
}

.recipe-list li::before {
  content: counter(step, decimal-leading-zero);
  grid-row: span 2;
  margin-top: 0.3rem;
  color: var(--accent);
  font-family: var(--mono);
  font-size: 0.8rem;
  font-weight: 700;
}

.recipe-list h3 { margin: 0 0 0.3rem; font-size: 1.2rem; letter-spacing: -0.02em; }
.recipe-list p { max-width: 46rem; margin: 0; color: var(--muted); }

/* Rules */

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

.rules p {
  display: grid;
  margin: 0;
  padding: 1.4rem 0;
  border-bottom: 1px solid var(--rule);
  grid-template-columns: minmax(14rem, 0.8fr) 1.2fr;
  gap: 0.5rem 2.5rem;
}

.rules strong { font-size: 1.1rem; letter-spacing: -0.02em; }
.rules span { max-width: 46rem; color: var(--muted); }

/* CTA */

.want > p { max-width: 42rem; margin: 0 0 2rem; font-size: clamp(1.1rem, 2vw, 1.3rem); line-height: 1.55; }

.cta {
  display: inline-flex;
  min-height: 48px;
  padding: 0 1.25rem;
  border: 1px solid var(--ink);
  align-items: center;
  font-family: var(--mono);
  font-size: 0.78rem;
  font-weight: 750;
  letter-spacing: 0.05em;
  text-decoration: none;
  text-transform: uppercase;
}

.cta:hover { border-color: var(--cobalt); background: var(--cobalt); color: #FFFFFF; }

footer { min-height: 5.5rem; }

@media (max-width: 980px) {
  .hero { grid-template-columns: 1fr; }
  .loop { grid-template-columns: 1fr; gap: 1.4rem; }
  .loop::before { top: 0; right: auto; bottom: 0; left: 0.4rem; width: 1px; height: auto; }
  .loop li { padding: 0 0 0 2rem; }
  .loop li::before { top: 0.15rem; }
  .map { grid-template-columns: 1fr; }
  .map-drop, .map-model { grid-column: 1; }
  .map-link i { display: inline-block; transform: rotate(90deg); }
  .map-link, .map-drop { padding-block: 0.2rem; }
}

@media (max-width: 720px) {
  .demo { min-height: 24rem; box-shadow: 0.75rem 0.75rem 0 rgba(36, 91, 255, 0.16); }
  .demo-tabs { grid-template-columns: repeat(2, 1fr); }
  .demo-tabs button:nth-child(2) { border-right: 0; }
  .demo-tabs button:nth-child(-n+2) { border-bottom: 1px solid var(--rule); }
  .ledger article { grid-template-columns: 1fr; gap: 0.5rem; }
  .ledger .key { margin-top: 0; }
  .rules p { grid-template-columns: 1fr; }
  .recipe-list li { grid-template-columns: 2.5rem 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; }
}