:root {
  --bg: #0b1220;
  --bg-alt: #0f1a2e;
  --surface: #131f36;
  --border: #22314d;
  --text: #e6ecf5;
  --muted: #9aa9c2;
  --accent: #38bdf8;
  --accent-strong: #0ea5e9;
  --on-accent: #04121f;
  --radius: 14px;
  --shadow: 0 10px 30px rgb(0 0 0 / 0.25);
  --font-sans: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  color-scheme: dark;
}

:root[data-theme="light"] {
  --bg: #f6f8fc;
  --bg-alt: #eaf0f9;
  --surface: #ffffff;
  --border: #d5deec;
  --text: #0f1b2d;
  --muted: #4b5b75;
  --accent: #0369a1;
  --accent-strong: #075985;
  --on-accent: #ffffff;
  --shadow: 0 10px 30px rgb(15 27 45 / 0.08);
  color-scheme: light;
}

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

html { scroll-behavior: smooth; scroll-padding-top: 4.5rem; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

img, svg { max-width: 100%; }

a { color: var(--accent); }
a:hover { color: var(--accent-strong); }

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  padding: 0.1em 0.4em;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 6px;
}

.container {
  width: min(1080px, 100% - 2rem);
  margin-inline: auto;
}

.skip-link {
  position: absolute;
  left: 1rem;
  top: -4rem;
  padding: 0.5rem 1rem;
  background: var(--accent);
  color: var(--on-accent);
  border-radius: 8px;
  z-index: 20;
}
.skip-link:focus { top: 1rem; }

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: color-mix(in srgb, var(--bg) 85%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  min-height: 3.75rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--font-mono);
  font-size: 0.95rem;
  color: var(--text);
  text-decoration: none;
  margin-right: auto;
}
.brand:hover { color: var(--text); }

.brand-mark {
  width: 14px;
  height: 14px;
  border-radius: 4px;
  background: linear-gradient(135deg, var(--accent), #818cf8);
}

.nav-list {
  display: flex;
  gap: 1.25rem;
  margin: 0;
  padding: 0;
  list-style: none;
}
.nav-list a {
  color: var(--muted);
  text-decoration: none;
  font-size: 0.95rem;
}
.nav-list a:hover { color: var(--text); }

.theme-toggle {
  display: grid;
  place-items: center;
  width: 2.25rem;
  height: 2.25rem;
  color: var(--text);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  cursor: pointer;
  transition: border-color 0.2s;
}
.theme-toggle:hover { border-color: var(--accent); }

:root[data-theme="dark"] .icon-moon,
:root[data-theme="light"] .icon-sun { display: none; }

/* Hero */
.hero {
  padding: clamp(4rem, 12vw, 8rem) 0 clamp(3rem, 8vw, 5.5rem);
  background:
    radial-gradient(60rem 28rem at 15% -10%, rgb(56 189 248 / 0.18), transparent 60%),
    radial-gradient(40rem 24rem at 90% 10%, rgb(129 140 248 / 0.16), transparent 60%);
}

.eyebrow {
  margin: 0 0 1rem;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
}

h1 {
  margin: 0;
  max-width: 14ch;
  font-size: clamp(2.6rem, 8vw, 5rem);
  line-height: 1.05;
  letter-spacing: -0.03em;
}
.accent { color: var(--accent); }

.lead {
  max-width: 52ch;
  margin: 1.5rem 0 2rem;
  font-size: clamp(1.05rem, 2.2vw, 1.25rem);
  color: var(--muted);
}

.actions { display: flex; flex-wrap: wrap; gap: 0.75rem; }

.btn {
  display: inline-block;
  padding: 0.7rem 1.25rem;
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
  border-radius: 10px;
  border: 1px solid transparent;
  transition: transform 0.15s, background-color 0.2s, border-color 0.2s;
}
.btn:active { transform: translateY(1px); }
.btn-primary { background: var(--accent); color: var(--on-accent); }
.btn-primary:hover { background: var(--accent-strong); color: var(--on-accent); }
.btn-ghost { color: var(--text); border-color: var(--border); }
.btn-ghost:hover { color: var(--text); border-color: var(--accent); }

/* Sections */
.section { padding: clamp(3rem, 8vw, 5rem) 0; }
.section-alt { background: var(--bg-alt); border-block: 1px solid var(--border); }

h2 {
  margin: 0 0 0.5rem;
  font-size: clamp(1.6rem, 4vw, 2.1rem);
  letter-spacing: -0.02em;
}
h3 { margin: 0 0 0.4rem; font-size: 1.1rem; }

.section-lead { margin: 0 0 2.5rem; color: var(--muted); }

/* Pipeline */
.pipeline {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
  gap: 1rem;
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: stage;
}

.stage {
  position: relative;
  padding: 1.5rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}
.stage p { margin: 0; color: var(--muted); font-size: 0.95rem; }

.stage-index {
  display: block;
  margin-bottom: 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--accent);
}

@media (min-width: 900px) {
  .stage:not(:last-child)::after {
    content: "";
    position: absolute;
    top: 50%;
    right: -1rem;
    width: 1rem;
    height: 2px;
    background: linear-gradient(90deg, var(--accent), transparent);
  }
}

/* Cards */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1rem;
  margin-top: 2rem;
}

.card {
  padding: 1.5rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: transform 0.2s, border-color 0.2s;
}
.card:hover { transform: translateY(-3px); border-color: var(--accent); }
.card p { margin: 0; color: var(--muted); font-size: 0.95rem; }

/* Chips */
.chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin: 1.5rem 0 0;
  padding: 0;
  list-style: none;
}
.chips li {
  padding: 0.4rem 0.9rem;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 999px;
}

/* Diagram */
.diagram { margin: 0; }
.diagram svg { display: block; width: 100%; height: auto; }
.diagram figcaption, .terminal figcaption {
  margin-top: 1rem;
  font-size: 0.9rem;
  color: var(--muted);
}
.d-node rect { fill: var(--surface); stroke: var(--border); stroke-width: 1.5; }
.d-node text { fill: var(--text); font: 600 15px var(--font-sans); }
.d-node .d-sub, .d-sub { fill: var(--muted); font: 400 12px var(--font-sans); }
.d-accent rect { stroke: var(--accent); }
.d-line { fill: none; stroke: var(--muted); stroke-width: 1.8; }
.d-dash { stroke-dasharray: 4 4; }
.d-arrow { fill: var(--muted); }

/* Code */
.code-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1rem;
  margin-top: 2rem;
}
.code-card, .terminal {
  margin: 0;
  min-width: 0;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}
.code-card figcaption {
  padding: 0.6rem 1rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--muted);
  border-bottom: 1px solid var(--border);
}
pre {
  margin: 0;
  padding: 1rem;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  line-height: 1.65;
}
pre code { padding: 0; background: none; border: 0; font-size: inherit; }
.code-card pre { white-space: pre-wrap; overflow-wrap: anywhere; }

.terminal { margin-top: 1rem; }
.terminal-bar { display: flex; gap: 6px; padding: 0.7rem 1rem; border-bottom: 1px solid var(--border); }
.terminal-bar span { width: 10px; height: 10px; border-radius: 50%; background: var(--border); }
.terminal figcaption { margin: 0; padding: 0 1rem 1rem; }

/* Table */
.table-wrap { margin-top: 1.5rem; overflow-x: auto; border: 1px solid var(--border); border-radius: var(--radius); }
table { width: 100%; border-collapse: collapse; font-size: 0.95rem; background: var(--surface); }
th, td { padding: 0.8rem 1rem; text-align: left; border-bottom: 1px solid var(--border); }
tbody tr:last-child > * { border-bottom: 0; }
thead th { font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.06em; color: var(--muted); }
tbody th { font-weight: 600; white-space: nowrap; }
td { color: var(--muted); }
td:first-of-type { color: var(--text); font-family: var(--font-mono); font-size: 0.85rem; white-space: nowrap; }

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

/* Footer */
.site-footer {
  padding: 2rem 0;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.9rem;
}
.footer-inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.5rem;
}
.footer-inner p { margin: 0; }

/* Scroll reveal */
.reveal { opacity: 0; transform: translateY(14px); transition: opacity 0.5s ease, transform 0.5s ease; }
.reveal.is-visible { opacity: 1; transform: none; }

@media (max-width: 800px) {
  .nav-list { display: none; }
}

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