:root,
[data-theme="dark"] {
  --bg-primary: #1e1e1e;
  --bg-secondary: #252526;
  --bg-tertiary: #2d2d30;
  --border: #3c3c3c;

  --text-primary: #d4d4d4;
  --text-secondary: #9d9d9d;
  --text-muted: #6a6a6a;

  --accent: #3794ff;
  --accent-hover: #5aa6ff;
  --accent-dim: #264f78;
  --accent-text: #ffffff;

  --code-bg: #1e1e1e;
  --code-border: #3c3c3c;

  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
}

[data-theme="light"] {
  --bg-primary: #ffffff;
  --bg-secondary: #f3f2ef;
  --bg-tertiary: #f8f9fa;
  --border: #e0e0e0;

  --text-primary: #1d2226;
  --text-secondary: #565e64;
  --text-muted: #86888a;

  --accent: #0a66c2;
  --accent-hover: #004182;
  --accent-dim: #e7f0fa;
  --accent-text: #ffffff;

  --code-bg: #f6f8fa;
  --code-border: #d0d7de;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: var(--font);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.55;
}

::selection { background: var(--accent-dim); }

.wrap {
  max-width: 760px;
  margin: 0 auto;
  padding: 0 24px;
}

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

.site-nav {
  border-bottom: 1px solid var(--border);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 16px;
  padding-bottom: 16px;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
  color: var(--text-primary);
}

.nav-brand img {
  width: 28px;
  height: 28px;
  border-radius: 7px;
}

.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  padding: 0;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--bg-tertiary);
  color: var(--text-primary);
  cursor: pointer;
}

.theme-toggle:hover { border-color: var(--accent); color: var(--accent); }

.theme-toggle .icon-sun,
.theme-toggle .icon-moon { display: none; }

[data-theme="dark"] .theme-toggle .icon-sun { display: block; }
[data-theme="light"] .theme-toggle .icon-moon { display: block; }

.hero {
  padding: 96px 0 64px;
  text-align: center;
}

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin-bottom: 16px;
}

h1 {
  font-size: clamp(2rem, 5vw, 3rem);
  line-height: 1.15;
  margin: 0 0 24px;
  color: var(--text-primary);
}

.lede {
  font-size: 1.15rem;
  color: var(--text-primary);
  max-width: 620px;
  margin: 0 auto 32px;
}

.cta-row {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}

.hero-diagram {
  max-width: 680px;
  margin: 48px auto 0;
}

.hero-diagram svg {
  width: 100%;
  height: auto;
  display: block;
}

.diagram-source rect {
  fill: var(--bg-tertiary);
  stroke: var(--border);
  stroke-width: 1.5;
}

.diagram-source text {
  fill: var(--text-primary);
  font-family: var(--font);
  font-size: 15px;
  font-weight: 600;
}

.diagram-graph rect {
  fill: var(--accent-dim);
  stroke: var(--accent);
  stroke-width: 1.5;
}

.diagram-graph .diagram-title {
  fill: var(--accent);
  font-family: var(--font);
  font-size: 16px;
  font-weight: 600;
}

.diagram-output rect {
  fill: var(--bg-tertiary);
  stroke: var(--text-primary);
  stroke-width: 2;
}

.diagram-output .diagram-title {
  fill: var(--text-primary);
  font-family: var(--font);
  font-size: 16px;
  font-weight: 700;
}

.diagram-subtitle {
  fill: var(--text-secondary);
  font-family: var(--font);
  font-size: 12px;
}

.diagram-arrow {
  stroke: var(--text-muted);
  stroke-width: 1.5;
}

.diagram-arrowhead-fill {
  fill: var(--text-muted);
}

.diagram-flow-dot {
  fill: var(--accent);
}

@media (prefers-reduced-motion: reduce) {
  .diagram-flow-dot {
    display: none;
  }
}

.btn {
  display: inline-block;
  padding: 12px 22px;
  border-radius: 8px;
  border: 1px solid var(--border);
  color: var(--text-primary);
  text-decoration: none;
  font-weight: 500;
  transition: transform 0.1s ease, border-color 0.1s ease;
}

.btn:hover { transform: translateY(-1px); border-color: var(--accent); }

.btn-primary {
  background: var(--accent);
  color: var(--accent-text);
  border-color: var(--accent);
}

.btn-primary:hover {
  background: var(--accent-hover);
  border-color: var(--accent-hover);
}

.btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
  transform: none;
}

.btn:disabled:hover {
  transform: none;
  border-color: var(--border);
}

.section { padding: 56px 0; }
.section.alt { background: var(--bg-secondary); }
.section.example .wrap { padding-top: 0; }

.example-label {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin: 24px 0 12px;
}

h2 {
  font-size: 1.6rem;
  margin: 0 0 20px;
  color: var(--text-primary);
}

h3 { font-size: 1.1rem; margin: 0 0 6px; color: var(--text-primary); }

p { color: var(--text-primary); }

code {
  font-family: var(--mono);
  background: var(--code-bg);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.9em;
  color: var(--text-primary);
}

pre {
  background: var(--code-bg);
  border: 1px solid var(--code-border);
  border-radius: 10px;
  padding: 18px;
  overflow-x: auto;
}

pre code {
  background: none;
  padding: 0;
  color: var(--text-primary);
}

.steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 28px;
}

.steps li {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 16px;
}

.step-num {
  flex-shrink: 0;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--accent);
  color: var(--accent-text);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  font-size: 0.9rem;
}

.waitlist form {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 20px;
}

.waitlist input[type="email"],
.waitlist input[type="text"] {
  flex: 1 1 200px;
  padding: 12px 14px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--bg-tertiary);
  color: var(--text-primary);
  font-size: 1rem;
  font-family: var(--font);
}

.waitlist input[type="email"]:focus-visible,
.waitlist input[type="text"]:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
}

.waitlist button {
  cursor: pointer;
  font-size: 1rem;
  font-family: var(--font);
}

#waitlist-status {
  margin-top: 12px;
  min-height: 1.2em;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

footer {
  padding: 40px 0 60px;
  text-align: center;
  border-top: 1px solid var(--border);
  margin-top: 40px;
}

footer p { color: var(--text-secondary); font-size: 0.9rem; }

.footer-inner { display: flex; flex-direction: column; gap: 8px; }
.footer-legal a { color: var(--text-secondary); }
.footer-legal a:hover { color: var(--accent); }

.legal {
  max-width: 720px;
  margin: 0 auto;
  padding: 56px 24px 80px;
}

.legal h1 { font-size: 2rem; margin: 0 0 8px; }
.legal .legal-updated { color: var(--text-secondary); font-size: 0.9rem; margin: 0 0 40px; }
.legal h2 { font-size: 1.25rem; margin: 40px 0 12px; }
.legal p, .legal li { color: var(--text-primary); line-height: 1.7; }
.legal ul { padding-left: 20px; }
.legal li { margin-bottom: 8px; }
.legal a { color: var(--accent); }

@media (max-width: 520px) {
  .hero { padding: 64px 0 40px; }
  .waitlist form { flex-direction: column; }
}