:root {
  --ink: #f7f8f5;
  --muted: #a1adb3;
  --surface: #1c1c1c;
  --panel: #2c2c2c;
  --panel-soft: #242424;
  --border: #414141;
  --emerald: #18cca0;
  --emerald-dark: #0f352c;
  --success: #22d7a2;
  --warning: #f7c779;
  --danger: #f38b83;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--surface); color: var(--ink); font: 16px/1.65 Manrope, sans-serif; }
a { color: inherit; text-decoration: none; }

.hero { min-height: 94vh; padding: 1.5rem 6vw 3rem; background: var(--surface); border-bottom: 1px solid var(--border); color: var(--ink); display: flex; flex-direction: column; }
nav, footer { display: flex; align-items: center; justify-content: space-between; gap: 1rem; font-size: .8rem; font-weight: 800; letter-spacing: .1em; text-transform: uppercase; }
nav > a:not(.mark) { color: var(--muted); transition: color 150ms ease; }
nav > a:not(.mark):hover { color: var(--emerald); }
.mark { display: inline-flex; align-items: center; gap: .55rem; min-width: 0; padding: 0; color: var(--ink); font: 800 1.35rem/1 Georgia, serif; letter-spacing: -.06em; text-decoration: none; }
.mark img { display: block; width: 2.35rem; height: 2.35rem; }
.hero-copy { max-width: 920px; margin: auto 0 2.5rem; }
.eyebrow { margin: 0 0 1rem; color: var(--emerald); font: 500 .72rem DM Mono, monospace; letter-spacing: .11em; text-transform: uppercase; }
h1, h2, h3 { line-height: 1.04; letter-spacing: -.05em; }
h1 { margin: .2rem 0 1.4rem; font: 700 clamp(3.3rem, 9vw, 8rem)/.94 Fraunces, serif; }
h1 em { color: var(--emerald); }
h2 { margin: 0 0 1.8rem; font: 700 clamp(2rem, 4vw, 4rem) Fraunces, serif; }
h3 { font: 700 1.55rem Fraunces, serif; }
.lede { max-width: 620px; color: var(--muted); font-size: 1.15rem; }
.pills { display: flex; flex-wrap: wrap; gap: .5rem; margin-top: 2rem; }
.pills span { padding: .35rem .65rem; border: 1px solid var(--border); border-radius: 99px; color: var(--muted); font: 500 .7rem DM Mono, monospace; }
.hero-stats { display: flex; gap: clamp(1.2rem, 6vw, 6rem); padding-top: 1.2rem; border-top: 1px solid var(--border); }
.hero-stats strong { display: block; color: var(--emerald); font: 700 2rem Fraunces, serif; }
.hero-stats span { color: var(--muted); font-size: .75rem; }

.section { padding: clamp(4rem, 9vw, 9rem) 12vw; border-bottom: 1px solid var(--border); }
.two, .split { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: clamp(2rem, 8vw, 8rem); }
.contrast, .roadmap { background: var(--panel-soft); }
.cards, .pattern-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; }
.two .cards { grid-template-columns: 1fr; }
.cards article, .pattern-grid article { padding: 1.6rem; border: 1px solid var(--border); border-radius: 1.1rem; background: var(--panel); color: var(--ink); }
.cards article { transition: border-color 150ms ease, transform 150ms ease; }
.cards article:hover { border-color: var(--emerald); transform: translateY(-2px); }
.cards b { display: block; color: var(--emerald); font: 700 1.5rem Fraunces, serif; }
.cards p, .pattern-grid p { color: var(--muted); }
.dark { background: #171717; }
.pattern-grid { grid-template-columns: repeat(2, 1fr); }
.pattern-grid article { background: var(--panel-soft); }

.diagram { padding: 1.5rem; border: 1px solid var(--border); border-radius: 1.25rem; background: var(--panel); text-align: center; }
.lane, .data, .grid { display: flex; justify-content: center; gap: .8rem; flex-wrap: wrap; }
.lane span, .data span { padding: .35rem .8rem; border: 1px solid var(--border); border-radius: 99px; background: var(--panel-soft); color: var(--muted); font: 500 .7rem DM Mono, monospace; }
.node { min-width: 110px; padding: .7rem 1rem; border: 1px solid var(--border); border-radius: .8rem; background: var(--panel-soft); font-weight: 800; }
.node small { display: block; color: var(--muted); font-size: .65rem; font-weight: 500; }
.gateway { color: #09231d; background: var(--emerald); border-color: var(--emerald); }
.gateway small { color: #0f352c; }
.hot { border-color: var(--warning); }
.accent { border-color: #7bd9ff; }
.diagram i { display: block; height: 25px; margin: auto; border-left: 1px solid var(--border); }
.grid { max-width: 670px; margin: auto; }
.data { margin-top: 1.2rem; }
.caption { color: var(--muted); font-size: .85rem; }
.model { display: flex; flex-wrap: wrap; gap: .8rem; }
.model div { padding: .8rem 1rem; border: 1px solid var(--border); border-radius: .75rem; background: var(--panel); font-weight: 800; }
.model small { color: var(--emerald); font: 500 .65rem DM Mono, monospace; }
.flow { padding: 0; list-style: none; }
.flow li { display: grid; grid-template-columns: 3rem 1fr; gap: 1rem; padding: 1rem 0; border-top: 1px solid var(--border); }
.flow b { display: grid; width: 2rem; height: 2rem; place-items: center; border-radius: 50%; color: #10201d; background: var(--emerald); font: 500 .75rem DM Mono, monospace; }
code { padding: .1rem .3rem; border-radius: .25rem; color: var(--emerald); background: var(--panel); font: 500 .85em DM Mono, monospace; }
.lessons { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1rem; }
.lessons p { margin: 0; padding: 1.2rem; border: 1px solid var(--border); border-radius: .85rem; background: var(--panel); }
table { width: 100%; border-collapse: collapse; }
th, td { padding: 1rem; text-align: left; border-top: 1px solid var(--border); }
th { color: var(--emerald); font: 500 .7rem DM Mono, monospace; text-transform: uppercase; }
td { color: var(--muted); }
td:first-child { color: var(--ink); font-weight: 800; }
footer { padding: 2rem 6vw; background: #171717; color: var(--ink); letter-spacing: 0; text-transform: none; }
footer p { color: var(--muted); font-size: .8rem; }

@media (max-width: 720px) {
  .section { padding-inline: 6vw; }
  .two, .split, .lessons, .pattern-grid, .cards { grid-template-columns: 1fr; }
  .hero-stats { gap: 1.5rem; }
  .hero { min-height: 82vh; }
  nav a:not(.mark) { display: none; }
  .mark { font-size: 1.15rem; }
  .mark img { width: 2rem; height: 2rem; }
  table { font-size: .85rem; }
  th, td { padding: .7rem; }
  .model { display: grid; }
  .section h2 { font-size: 2.4rem; }
}