:root {
  --bg: #060a14;
  --bg-alt: #0a1020;
  --panel: #0e1626;
  --line: #1c2740;
  --text: #e6ecf8;
  --muted: #93a3c2;
  --dim: #6b7c9e;
  --mint: #6ee7b7;
  --blue: #60a5fa;
  --violet: #a78bfa;
  --radius: 14px;
  --wrap: 1180px;
  color-scheme: dark;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

body::before {
  content: '';
  position: fixed;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(60rem 40rem at 12% -8%, rgba(110, 231, 183, 0.10), transparent 60%),
    radial-gradient(52rem 34rem at 88% 4%, rgba(96, 165, 250, 0.12), transparent 62%),
    radial-gradient(48rem 30rem at 50% 100%, rgba(167, 139, 250, 0.08), transparent 60%);
}

a { color: inherit; text-decoration: none; }

code, pre, .mono {
  font-family: ui-monospace, 'JetBrains Mono', 'SFMono-Regular', Menlo, monospace;
}

code { font-size: 0.92em; color: var(--mint); }

h1, h2, h3, h4 { line-height: 1.15; margin: 0 0 0.5em; letter-spacing: -0.02em; }

h1 { font-size: clamp(2.4rem, 6vw, 4.1rem); font-weight: 800; }
h2 { font-size: clamp(1.7rem, 3.4vw, 2.5rem); font-weight: 700; }
h3 { font-size: 1.12rem; font-weight: 650; }

p { margin: 0 0 1rem; }

em { font-style: normal; color: var(--mint); }

/* ------------------------------------------------------------------ nav */

.nav {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  gap: 1.5rem;
  padding: 0.85rem clamp(1rem, 4vw, 2.5rem);
  background: rgba(6, 10, 20, 0.78);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.nav-links {
  display: flex;
  gap: 1.4rem;
  margin-left: auto;
  color: var(--muted);
  font-size: 0.94rem;
}

.nav-links a:hover { color: var(--text); }

.nav-actions { display: flex; gap: 0.6rem; }

@media (max-width: 900px) {
  .nav-links { display: none; }
  .nav-actions { margin-left: auto; }
}

/* ---------------------------------------------------------------- buttons */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.55rem 1.05rem;
  border-radius: 999px;
  border: 1px solid var(--line);
  font-weight: 600;
  font-size: 0.93rem;
  cursor: pointer;
  transition: transform 0.15s ease, border-color 0.15s ease, background 0.15s ease;
}

.btn:hover { transform: translateY(-1px); }

.btn-primary {
  background: linear-gradient(135deg, var(--mint), var(--blue));
  color: #05121f;
  border-color: transparent;
}

.btn-ghost { background: rgba(255, 255, 255, 0.03); color: var(--text); }
.btn-ghost:hover { border-color: var(--mint); }

.btn-lg { padding: 0.8rem 1.5rem; font-size: 1rem; }
.btn-sm { padding: 0.35rem 0.8rem; font-size: 0.82rem; }

/* ------------------------------------------------------------------ hero */

.hero {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: clamp(3rem, 8vw, 6rem) clamp(1rem, 4vw, 2.5rem) 3rem;
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  gap: clamp(2rem, 5vw, 4rem);
  align-items: center;
}

@media (max-width: 980px) {
  .hero { grid-template-columns: 1fr; }
}

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.16em;
  font-size: 0.74rem;
  font-weight: 700;
  color: var(--mint);
  margin-bottom: 0.9rem;
}

.lede { font-size: clamp(1.02rem, 1.6vw, 1.19rem); color: var(--muted); max-width: 44ch; }

.hero-actions { display: flex; flex-wrap: wrap; gap: 0.8rem; margin: 1.8rem 0 1.4rem; }

.hero-facts {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 1.4rem;
  padding: 0;
  margin: 0;
  color: var(--dim);
  font-size: 0.9rem;
}

.hero-facts strong { color: var(--text); }

/* --------------------------------------------------------------- window */

.window {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(180deg, #0d1526, #080e1c);
  box-shadow: 0 30px 80px -30px rgba(0, 0, 0, 0.9);
  overflow: hidden;
}

.window-bar {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.6rem 0.9rem;
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.02);
}

.window-bar span {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: #263352;
}

.window-bar p { margin: 0 0 0 0.7rem; font-size: 0.78rem; color: var(--dim); }

.window-body { padding: 1rem; display: flex; flex-direction: column; gap: 0.7rem; }

.msg {
  padding: 0.65rem 0.9rem;
  border-radius: 12px;
  font-size: 0.9rem;
  max-width: 90%;
}

.msg.user { background: linear-gradient(135deg, #1d3a8a, #2563eb); align-self: flex-end; }
.msg.agent { background: #101a2e; border: 1px solid var(--line); color: var(--muted); }

.promote {
  border: 1px solid #2a3d63;
  border-radius: 12px;
  background: rgba(110, 231, 183, 0.04);
  padding: 0.7rem 0.85rem;
}

.promote-head { font-size: 0.8rem; color: var(--muted); display: flex; align-items: center; gap: 0.5rem; }

.dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--mint);
  box-shadow: 0 0 0 4px rgba(110, 231, 183, 0.15);
}

.promote pre {
  margin: 0.6rem 0;
  font-size: 0.74rem;
  line-height: 1.6;
  overflow-x: auto;
}

.promote .add { color: var(--mint); }
.promote .meta { color: var(--dim); }
.promote-actions { display: flex; gap: 0.5rem; }

/* ----------------------------------------------------------------- strip */

.strip {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 1rem clamp(1rem, 4vw, 2.5rem) 3rem;
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.strip-item {
  flex: 1 1 200px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1rem 1.2rem;
  background: var(--panel);
}

.strip-item h3 { margin-bottom: 0.2rem; }
.strip-item p { margin: 0; color: var(--dim); font-size: 0.9rem; }
.strip-arrow { color: var(--mint); font-size: 1.4rem; }

@media (max-width: 760px) { .strip-arrow { display: none; } }

/* --------------------------------------------------------------- section */

.section {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: clamp(3rem, 7vw, 5.5rem) clamp(1rem, 4vw, 2.5rem);
}

.section.alt {
  max-width: none;
  background: var(--bg-alt);
  border-block: 1px solid var(--line);
}

.section.alt > * { max-width: var(--wrap); margin-inline: auto; }

.section-lede { color: var(--muted); max-width: 65ch; font-size: 1.03rem; }

/* ----------------------------------------------------------------- steps */

.steps {
  margin-top: 2.4rem;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
  gap: 1rem;
}

.step {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.2rem;
  background: var(--panel);
  position: relative;
  overflow: hidden;
}

.step::after {
  content: '';
  position: absolute;
  inset: auto auto -40% -20%;
  width: 60%;
  height: 70%;
  background: radial-gradient(circle, rgba(96, 165, 250, 0.12), transparent 70%);
}

.step-n {
  display: inline-grid;
  place-items: center;
  width: 26px;
  height: 26px;
  border-radius: 8px;
  background: rgba(110, 231, 183, 0.14);
  color: var(--mint);
  font-size: 0.8rem;
  font-weight: 700;
  margin-bottom: 0.7rem;
}

.step p { color: var(--dim); font-size: 0.92rem; margin: 0; }

/* ------------------------------------------------------------ architecture */

.arch {
  margin: 2.4rem 0;
  display: flex;
  align-items: stretch;
  gap: 0.9rem;
  flex-wrap: wrap;
}

.arch-col { flex: 1 1 230px; display: flex; flex-direction: column; gap: 0.7rem; }

.arch-internal {
  flex: 2 1 420px;
  border: 1px dashed #2b3a5c;
  border-radius: var(--radius);
  padding: 1.6rem 0.9rem 0.9rem;
  position: relative;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
}

.arch-label {
  position: absolute;
  top: -0.62rem;
  left: 0.9rem;
  background: var(--bg-alt);
  padding: 0 0.5rem;
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--dim);
}

.arch-arrow { align-self: center; color: var(--mint); font-size: 1.3rem; }

.node {
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 0.7rem 0.85rem;
  background: var(--panel);
  font-weight: 600;
  font-size: 0.92rem;
}

.node small { display: block; font-weight: 400; color: var(--dim); font-size: 0.78rem; margin-top: 0.2rem; }
.node-core { border-color: var(--mint); box-shadow: 0 0 0 1px rgba(110, 231, 183, 0.18) inset; }
.node-edge { border-color: #2b3a5c; }
.node-ephemeral { border-style: dashed; border-color: var(--violet); }

@media (max-width: 860px) { .arch-arrow { display: none; } }

/* ----------------------------------------------------------------- cards */

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1rem;
  margin-top: 2rem;
}

.card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.3rem;
  background: var(--panel);
}

.card p { color: var(--dim); font-size: 0.93rem; margin: 0; }
.card-accent { border-top: 2px solid var(--mint); }

/* ----------------------------------------------------------------- split */

.split { display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr); gap: 1.4rem; margin-top: 2rem; }

@media (max-width: 980px) { .split { grid-template-columns: 1fr; } }

pre.code {
  margin: 0;
  padding: 1.2rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #070d1a;
  overflow-x: auto;
  font-size: 0.8rem;
  line-height: 1.65;
}

pre.code .k { color: #c084fc; }
pre.code .s { color: var(--mint); }
pre.code .c { color: var(--dim); font-style: italic; }
pre.code .d { color: #fbbf24; }
pre.code .t { color: #60a5fa; }
pre.code .f { color: #93c5fd; }

.split-notes { display: flex; flex-direction: column; gap: 0.8rem; }

.note { border-left: 2px solid var(--line); padding: 0.2rem 0 0.2rem 0.9rem; }
.note h4 { margin: 0 0 0.2rem; font-size: 0.97rem; }
.note p { margin: 0; color: var(--dim); font-size: 0.9rem; }

/* -------------------------------------------------------------- terminal */

.terminal {
  position: relative;
  margin-top: 2rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #070d1a;
  padding: 1.2rem 1.3rem;
  overflow-x: auto;
}

.terminal pre { margin: 0; font-size: 0.86rem; line-height: 1.8; }
.terminal .p { color: var(--mint); }
.terminal .c { color: var(--dim); }
.terminal .o { color: var(--blue); }

.copy {
  position: absolute;
  top: 0.7rem;
  right: 0.7rem;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--line);
  color: var(--muted);
  border-radius: 8px;
  padding: 0.25rem 0.6rem;
  font-size: 0.76rem;
  cursor: pointer;
}

.copy:hover { color: var(--text); border-color: var(--mint); }

.fineprint { color: var(--dim); font-size: 0.88rem; margin-top: 1rem; }

/* ------------------------------------------------------------------- faq */

.faq { margin-top: 2rem; display: flex; flex-direction: column; gap: 0.6rem; }

.faq details {
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--panel);
  padding: 0.9rem 1.1rem;
}

.faq summary { cursor: pointer; font-weight: 600; list-style: none; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::before { content: '+ '; color: var(--mint); font-weight: 700; }
.faq details[open] summary::before { content: '– '; }
.faq p { margin: 0.7rem 0 0; color: var(--dim); font-size: 0.94rem; }
.faq a { color: var(--blue); }

/* ------------------------------------------------------------------- cta */

.cta {
  text-align: center;
  padding: clamp(3.5rem, 8vw, 6rem) 1.5rem;
  border-top: 1px solid var(--line);
  background:
    radial-gradient(40rem 20rem at 50% 0%, rgba(110, 231, 183, 0.10), transparent 70%),
    var(--bg-alt);
}

.cta p { color: var(--muted); font-size: 1.08rem; }
.cta .hero-actions { justify-content: center; }

/* ---------------------------------------------------------------- footer */

.footer {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  justify-content: space-between;
  align-items: center;
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 2.2rem clamp(1rem, 4vw, 2.5rem) 3rem;
  color: var(--dim);
  font-size: 0.9rem;
}

.footer p { margin: 0.5rem 0 0; }
.footer-links { display: flex; gap: 1.2rem; flex-wrap: wrap; }
.footer-links a:hover { color: var(--mint); }

/* --------------------------------------------------------------- reveal */

.reveal { opacity: 0; transform: translateY(14px); transition: opacity 0.6s ease, transform 0.6s ease; }
.reveal.visible { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
}