:root {
  --bg: #fbfbfd;
  --surface: #ffffff;
  --surface2: #f7f8fa;
  --border: #e5e7eb;
  --primary: #4f46e5;
  --primary-hover: #4338ca;
  --primary-light: #eef2ff;
  --text: #0f172a;
  --text-muted: #56607a;
  --text-light: #94a3b8;
  --radius: 10px;
  --radius-sm: 6px;
  --max: 1040px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}
code {
  font-family: 'SFMono-Regular', Consolas, 'Courier New', monospace;
  background: var(--primary-light);
  color: var(--primary);
  padding: 1px 6px;
  border-radius: 4px;
  font-size: 0.9em;
}

.eyebrow {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--primary);
  margin: 0 0 10px;
}

h1, h2 { letter-spacing: -0.02em; font-weight: 650; margin: 0; }
h1 { font-size: 44px; line-height: 1.15; }
h2 { font-size: 28px; line-height: 1.25; margin-bottom: 16px; }

p { margin: 0 0 14px; color: var(--text-muted); }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 9px 18px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
  border: 1px solid transparent;
  cursor: pointer;
  transition: background .15s, border-color .15s;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-hover); }
.btn-lg { padding: 12px 24px; font-size: 15px; }

/* ── Nav ── */
.nav {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(251,251,253,0.85);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 16px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.wordmark {
  font-weight: 700;
  font-size: 16px;
  letter-spacing: -0.01em;
  display: flex;
  align-items: center;
  gap: 8px;
}
.wordmark-mark { color: var(--primary); font-size: 14px; }

/* ── Hero ── */
.hero { padding: 96px 24px 88px; }
.hero-inner { max-width: 720px; margin: 0 auto; text-align: left; }
.hero-sub { font-size: 17px; max-width: 560px; margin-bottom: 32px; }

/* ── Story sections ── */
.story { padding: 72px 24px; border-top: 1px solid var(--border); }
.story-alt { background: var(--surface2); }
.story-inner {
  max-width: var(--max);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  align-items: center;
}
.story-alt .story-inner { grid-template-columns: 1fr 1fr; }
.story-alt .story-diagram { order: 1; }
.story-alt .story-text { order: 2; }
.story-text p { font-size: 15px; }
.story-text code { white-space: nowrap; }

/* diagram */
.story-diagram svg { width: 100%; height: auto; }
.edge { stroke: var(--border); stroke-width: 2; fill: none; }
.node { fill: var(--surface); stroke: var(--border); stroke-width: 1.5; }
.node-function { fill: var(--primary-light); stroke: var(--primary); }
.node-label { font-size: 13px; font-weight: 600; fill: var(--text); }
.node-sub { font-size: 10px; fill: var(--text-light); }
.diagram-caption { font-size: 12px; color: var(--text-light); text-align: center; margin-top: 8px; }

.agent-flow {
  display: flex;
  flex-direction: column;
  gap: 10px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
}
.agent-row { display: flex; align-items: center; gap: 12px; font-size: 13px; color: var(--text); }
.agent-arrow { font-size: 11px; color: var(--text-light); padding-left: 4px; }
.agent-tag {
  font-family: 'SFMono-Regular', Consolas, 'Courier New', monospace;
  font-size: 11px;
  font-weight: 600;
  padding: 3px 8px;
  border-radius: 4px;
  white-space: nowrap;
}
.agent-tag-director { background: var(--primary-light); color: var(--primary); }
.agent-tag-sub { background: #ecfdf5; color: #166534; }
.agent-tag-mcp { background: var(--surface2); color: var(--text-muted); border: 1px solid var(--border); }

/* ── Access / form ── */
.access { padding: 88px 24px 100px; border-top: 1px solid var(--border); }
.access-inner { max-width: 520px; margin: 0 auto; }
.access-sub { font-size: 15px; margin-bottom: 32px; }

.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.form-field { margin-bottom: 16px; }
.form-field label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 6px;
}
.form-field input, .form-field textarea {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-family: inherit;
  color: var(--text);
  background: var(--surface);
  outline: none;
  transition: border-color .15s, box-shadow .15s;
}
.form-field input:focus, .form-field textarea:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(79,70,229,.1);
}
.form-field textarea { resize: vertical; }

.form-status { font-size: 13px; margin: 14px 0 0; min-height: 18px; }
.form-status.ok { color: #166534; }
.form-status.err { color: #b91c1c; }

/* ── Footer ── */
.site-footer { border-top: 1px solid var(--border); padding: 28px 24px; }
.footer-inner {
  max-width: var(--max);
  margin: 0 auto;
  display: flex;
  gap: 10px;
  font-size: 13px;
  color: var(--text-light);
}
.footer-inner span:first-child { font-weight: 700; color: var(--text-muted); }

@media (max-width: 760px) {
  h1 { font-size: 32px; }
  .story-inner, .story-alt .story-inner { grid-template-columns: 1fr; gap: 32px; }
  .story-alt .story-diagram, .story-alt .story-text { order: unset; }
  .hero { padding: 64px 20px 56px; }
  .story { padding: 48px 20px; }
  .form-row { grid-template-columns: 1fr; }
}