/* SynthesisOS methodology site. Dark editorial, mobile-first. */
:root {
  --bg: #0c0d10;
  --bg-soft: #14161b;
  --panel: #171a21;
  --ink: #e8e9ec;
  --ink-soft: #a7abb4;
  --ink-faint: #71757e;
  --line: #262a33;
  --accent: #7c9cff;
  --accent-soft: #2b3350;
  --accent-dim: #1d2330;
  --max: 760px;
  --max-wide: 1040px;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 17px/1.65 ui-serif, Georgia, "Times New Roman", serif;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* header */
.site-head {
  display: flex; align-items: center; justify-content: space-between;
  gap: 1rem; flex-wrap: wrap;
  max-width: var(--max-wide); margin: 0 auto; padding: 1.1rem 1.25rem;
  border-bottom: 1px solid var(--line);
}
.brand { font-family: ui-sans-serif, system-ui, sans-serif; font-weight: 700; letter-spacing: -0.01em; color: var(--ink); font-size: 1.15rem; }
.site-head nav { display: flex; gap: 1.1rem; flex-wrap: wrap; }
.site-head nav a { font-family: ui-sans-serif, system-ui, sans-serif; font-size: 0.92rem; color: var(--ink-soft); padding: 0.4rem 0; min-height: 40px; display: inline-flex; align-items: center; }

main { max-width: var(--max-wide); margin: 0 auto; padding: 0 1.25rem; }

/* hero */
.hero { padding: 3rem 0 2.25rem; max-width: var(--max); }
.kicker { font-family: ui-sans-serif, system-ui, sans-serif; text-transform: uppercase; letter-spacing: 0.14em; font-size: 0.74rem; color: var(--accent); margin: 0 0 0.85rem; }
.hero h1 { font-family: ui-sans-serif, system-ui, sans-serif; font-size: clamp(1.9rem, 6vw, 3rem); line-height: 1.08; letter-spacing: -0.02em; margin: 0 0 1.1rem; }
.lede { font-size: 1.12rem; color: var(--ink); margin: 0 0 1.5rem; }
.receipts { color: var(--ink-soft); font-size: 0.98rem; }
.hero-cta { margin: 1.4rem 0; }

.cta {
  display: inline-block; font-family: ui-sans-serif, system-ui, sans-serif; font-weight: 600;
  background: var(--accent); color: #0b0d12; padding: 0.8rem 1.25rem; border-radius: 10px;
  min-height: 44px; line-height: 1.4; font-size: 0.98rem;
}
.cta:hover { text-decoration: none; filter: brightness(1.08); }

/* sections */
section { padding: 2.25rem 0; border-top: 1px solid var(--line); }
section h2 { font-family: ui-sans-serif, system-ui, sans-serif; font-size: clamp(1.4rem, 4vw, 1.9rem); letter-spacing: -0.015em; margin: 0 0 1.1rem; }
.section-lede { color: var(--ink-soft); max-width: var(--max); margin: 0 0 1.6rem; }

/* levers */
.lever-grid { display: grid; grid-template-columns: 1fr; gap: 1rem; }
.lever { background: var(--panel); border: 1px solid var(--line); border-radius: 12px; padding: 1.25rem; }
.lever h3 { font-family: ui-sans-serif, system-ui, sans-serif; font-size: 1.08rem; margin: 0 0 0.5rem; }
.lever p { color: var(--ink-soft); font-size: 0.98rem; margin: 0; }

/* brain grid */
.brain-grid { display: grid; grid-template-columns: 1fr; gap: 1rem; }
.brain-card { background: var(--panel); border: 1px solid var(--line); border-radius: 12px; padding: 1.25rem; display: block; transition: border-color 0.15s, transform 0.15s; }
.brain-card:hover { border-color: var(--accent); text-decoration: none; transform: translateY(-2px); }
.brain-card h3 { font-family: ui-sans-serif, system-ui, sans-serif; font-size: 1.12rem; margin: 0 0 0.45rem; color: var(--ink); }
.brain-card p { color: var(--ink-soft); font-size: 0.95rem; margin: 0 0 0.7rem; }
.brain-card .who { font-family: ui-sans-serif, system-ui, sans-serif; font-size: 0.78rem; color: var(--ink-faint); text-transform: uppercase; letter-spacing: 0.08em; }

/* bundle section */
.bundle p { color: var(--ink-soft); max-width: var(--max); }

/* brain article */
.brain article { max-width: var(--max); margin: 0 auto; padding: 2.5rem 0 1rem; }
.brain h1 { font-family: ui-sans-serif, system-ui, sans-serif; font-size: clamp(1.7rem, 5vw, 2.5rem); line-height: 1.1; letter-spacing: -0.02em; margin: 0.4rem 0 0.6rem; }
.tagline { font-size: 1.15rem; color: var(--ink-soft); margin: 0 0 1.5rem; }
.prose h2 { font-family: ui-sans-serif, system-ui, sans-serif; font-size: 1.35rem; margin: 2rem 0 0.7rem; border: 0; padding: 0; }
.prose h3 { font-family: ui-sans-serif, system-ui, sans-serif; font-size: 1.1rem; margin: 1.5rem 0 0.5rem; }
.prose p { margin: 0 0 1.05rem; }
.prose ul, .prose ol { margin: 0 0 1.05rem; padding-left: 1.3rem; }
.prose li { margin: 0 0 0.4rem; }
.prose blockquote { margin: 0 0 1.05rem; padding: 0.4rem 0 0.4rem 1rem; border-left: 3px solid var(--accent); color: var(--ink-soft); }
.prose code { background: var(--bg-soft); border: 1px solid var(--line); border-radius: 5px; padding: 0.1em 0.35em; font-size: 0.88em; font-family: ui-monospace, "SF Mono", Menlo, monospace; }
.prose hr { border: 0; border-top: 1px solid var(--line); margin: 2rem 0; }

.bundle-box { background: var(--accent-dim); border: 1px solid var(--line); border-radius: 12px; padding: 1.5rem; margin: 2.5rem 0 1.5rem; }
.bundle-box h3 { font-family: ui-sans-serif, system-ui, sans-serif; margin: 0 0 0.6rem; font-size: 1.15rem; }
.bundle-box p { color: var(--ink-soft); margin: 0 0 1.1rem; }

.more-brains { font-family: ui-sans-serif, system-ui, sans-serif; font-size: 0.92rem; display: flex; flex-wrap: wrap; gap: 0.9rem; align-items: center; padding: 1.5rem 0; border-top: 1px solid var(--line); }
.more-brains span { color: var(--ink-faint); }

/* footer */
.site-foot { max-width: var(--max-wide); margin: 2rem auto 0; padding: 2rem 1.25rem 3rem; border-top: 1px solid var(--line); }
.foot-links { display: flex; flex-wrap: wrap; gap: 1.1rem; font-family: ui-sans-serif, system-ui, sans-serif; font-size: 0.92rem; margin-bottom: 1rem; }
.foot-note { color: var(--ink-faint); font-size: 0.85rem; font-family: ui-sans-serif, system-ui, sans-serif; }

/* wider screens */
@media (min-width: 720px) {
  .lever-grid { grid-template-columns: repeat(3, 1fr); }
  .brain-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 1000px) {
  .brain-grid { grid-template-columns: repeat(2, 1fr); }
}