@font-face { font-family: 'Geist Sans'; src: url('https://cdn.jsdelivr.net/npm/geist@1.7.0/dist/fonts/geist-sans/Geist-Variable.woff2') format('woff2'); font-weight: 100 900; font-style: normal; font-display: swap; }
@font-face { font-family: 'Geist Mono'; src: url('https://cdn.jsdelivr.net/npm/geist@1.7.0/dist/fonts/geist-mono/GeistMono-Variable.woff2') format('woff2'); font-weight: 100 900; font-style: normal; font-display: swap; }
@font-face { font-family: 'Geist Pixel'; src: url('https://cdn.jsdelivr.net/npm/geist@1.7.0/dist/fonts/geist-pixel/GeistPixel-Square.woff2') format('woff2'); font-weight: 400; font-style: normal; font-display: swap; }

:root {
  --sans: 'Geist Sans', system-ui, -apple-system, sans-serif;
  --mono: 'Geist Mono', ui-monospace, 'SF Mono', monospace;
  --pixel: 'Geist Pixel', 'Geist Mono', monospace;
  --bg: #F2F0EC;
  --surface: #F8F6F3;
  --text: #1A1714;
  --text-2: #46423C;
  --text-3: #6B6560;
  --text-4: #9A958E;
  --border: #D8D5CF;
  --accent: #1A1714;
}

*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; }
::selection { background: rgba(26,23,20,0.25); color: var(--text); }

body {
  font-family: var(--sans);
  background: var(--bg);
  color: var(--text);
  font-size: 17px;
  line-height: 1.6;
}

/* Grain — applied to background layer, not as overlay */
body {
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.75' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.12'/%3E%3C/svg%3E");
  background-size: 256px 256px;
  background-blend-mode: overlay;
}

/* ---- Nav ---- */
.nav {
  max-width: 64rem;
  margin: 0 auto;
  padding: 1.5rem 2.5rem 0;
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 0.5rem 2rem;
}
.nav-mark {
  font-family: var(--mono);
  font-size: 14px;
  color: var(--text-3);
  text-decoration: none;
  letter-spacing: -0.01em;
}
.nav-mark:hover { color: var(--text); }
.nav-links {
  display: flex;
  gap: 1.5rem;
}
.nav-links a {
  font-family: var(--mono);
  font-size: 14px;
  color: var(--text-4);
  text-decoration: none;
  transition: color 0.15s;
}
.nav-links a:hover { color: var(--text); }
.nav-links a.active { color: var(--text); }

/* ---- Page ---- */
.page {
  max-width: 64rem;
  margin: 0 auto;
  padding: 0 2.5rem;
}

/* ---- Hero ---- */
.hero {
  padding: min(10vh, 5rem) 0 0;
}
.hero-title {
  font-family: var(--sans);
  font-size: clamp(28px, 5.5vw, 40px);
  font-weight: 400;
  line-height: 1.35;
  letter-spacing: -0.01em;
  color: var(--text-2);
}
.hero-name {
  font-family: var(--pixel);
  font-size: clamp(36px, 8vw, 56px);
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--text);
  display: block;
  margin-bottom: 0.15rem;
}

hr {
  border: none;
  height: 1px;
  background: var(--border);
  margin: 2.5rem 0;
}

/* ---- Lede ---- */
.lede {
  font-family: var(--sans);
  font-size: 17px;
  color: var(--text-2);
  line-height: 1.7;
}
.lede strong {
  color: var(--text);
  font-weight: 500;
}

/* ---- Cards ---- */
.cards {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: 4px;
  overflow: hidden;
}
.card {
  background: var(--surface);
  padding: 1.5rem 1.75rem;
  text-decoration: none;
  color: inherit;
  transition: background 0.15s;
}
.card:hover { background: var(--bg); }
.card-title {
  font-family: var(--mono);
  font-size: 16px;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 0.4rem;
}
.card-desc {
  font-family: var(--sans);
  font-size: 15px;
  color: var(--text-3);
  line-height: 1.6;
  margin-bottom: 0.75rem;
}
.card-link {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--text-3);
}

/* ---- Section Title ---- */
.section-title {
  font-family: var(--mono);
  font-size: 14px;
  font-weight: 600;
  color: var(--text-3);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 1.5rem;
}

/* ---- Steps ---- */
.steps {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem 3rem;
}
.step {
  display: flex;
  gap: 1.25rem;
  align-items: flex-start;
}
.step-num {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--text-4);
  flex-shrink: 0;
  padding-top: 0.15rem;
}
.step-title {
  font-family: var(--sans);
  font-size: 17px;
  font-weight: 500;
  color: var(--text);
  margin-bottom: 0.25rem;
}
.step-desc {
  font-family: var(--sans);
  font-size: 15px;
  color: var(--text-3);
  line-height: 1.65;
}

/* ---- Hero Link ---- */
.hero-link {
  color: var(--text);
  text-decoration: none;
  border-bottom: 2px solid var(--border);
  transition: border-color 0.15s;
}
.hero-link:hover { border-color: var(--text); }

/* ---- Compatibility ---- */
.compat-label {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--text-4);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.4rem;
}
.compat-list {
  font-family: var(--mono);
  font-size: 15px;
  color: var(--text-3);
}
.compat-list a {
  color: var(--text-3);
  text-decoration: none;
  border-bottom: 1px solid var(--border);
  transition: color 0.15s, border-color 0.15s;
}
.compat-list a:hover {
  color: var(--text);
  border-color: var(--text-3);
}

/* ---- Kicker ---- */
.kicker {
  font-family: var(--sans);
  font-style: italic;
  font-size: 20px;
  color: var(--text-2);
  line-height: 1.6;
}

/* ---- Email ---- */
.email-form {
  display: flex;
  border: 1px solid var(--border);
  border-radius: 4px;
  overflow: hidden;
  margin-top: 1.5rem;
}
.email-form input[type="email"] {
  flex: 1;
  padding: 0.85rem 1.1rem;
  border: none;
  background: var(--surface);
  font-family: var(--sans);
  font-size: 16px;
  color: var(--text);
  outline: none;
}
.email-form input::placeholder { color: var(--text-4); }
.email-form button {
  padding: 0.85rem 1.5rem;
  border: none;
  background: var(--text);
  color: var(--bg);
  font-family: var(--mono);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.15s;
}
.email-form button:hover { background: var(--text-2); }

/* ---- Footer ---- */
.footer {
  padding: 3rem 0 2.5rem;
  font-family: var(--mono);
  font-size: 13px;
  color: var(--text-4);
}

/* ---- Page Header (subpages) ---- */
.page-header {
  padding: min(8vh, 4rem) 0 0;
}
.page-title {
  font-family: var(--pixel);
  font-size: clamp(32px, 7vw, 48px);
  line-height: 1.15;
  letter-spacing: -0.02em;
  color: var(--text);
  margin-bottom: 0.5rem;
}
.page-subtitle {
  font-family: var(--sans);
  font-size: 18px;
  color: var(--text-2);
  line-height: 1.55;
}

/* ---- Prose ---- */
.prose {
  font-family: var(--sans);
  font-size: 16px;
  color: var(--text-2);
  line-height: 1.75;
}
.prose h2 {
  font-family: var(--mono);
  font-size: 14px;
  font-weight: 600;
  color: var(--text-3);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin: 2.5rem 0 1rem;
}
.prose h2:first-child { margin-top: 0; }
.prose p { margin-bottom: 1rem; }
.prose p:last-child { margin-bottom: 0; }
.prose strong {
  color: var(--text);
  font-weight: 500;
}
.prose a {
  color: var(--text);
  text-decoration: none;
  border-bottom: 1px solid var(--border);
  transition: border-color 0.15s;
}
.prose a:hover { border-color: var(--text); }
.prose code {
  font-family: var(--mono);
  font-size: 14px;
  background: var(--surface);
  border: 1px solid var(--border);
  padding: 0.15em 0.4em;
  border-radius: 3px;
}
.prose ul, .prose ol {
  margin: 0.75rem 0 1rem 1.25rem;
  font-size: 15px;
  color: var(--text-3);
  line-height: 1.7;
}
.prose li { margin-bottom: 0.4rem; }

/* ---- Code Block ---- */
.code-block {
  background: #141210;
  color: #D8D4CC;
  font-family: var(--mono);
  font-size: 14px;
  line-height: 1.75;
  padding: 1.5rem 1.75rem;
  border-radius: 4px;
  overflow-x: auto;
  margin: 1rem 0;
  white-space: pre;
}
.code-block .cm { color: #6B6560; }
.code-block .kw { color: #A8A29E; }
.code-block .fn { color: #D8D4CC; }
.code-block .str { color: #9A958E; }

/* ---- CLI Session ---- */
.cli-window {
  background: #0A0908;
  border: 1px solid #302C26;
  border-radius: 8px;
  margin: 1.5rem 0;
  overflow: hidden;
}
.cli-titlebar {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 0.65rem 1rem;
  background: #141210;
  border-bottom: 1px solid #302C26;
}
.cli-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: #302C26;
}
.cli-titlebar-text {
  font-family: var(--mono);
  font-size: 12px;
  color: #5C5549;
  margin-left: 0.5rem;
}
.cli-session {
  background: #0A0908;
  color: #D8D4CC;
  font-family: var(--mono);
  font-size: 14px;
  line-height: 1.75;
  padding: 1.25rem 1.5rem;
  height: 18rem;
  overflow: hidden;
}
.cli-line {
  white-space: pre-wrap;
  opacity: 0;
  animation: cli-fade-in 0.25s ease forwards;
}
.cli-prompt { color: #6B6560; }
.cli-cmd { color: #D8D4CC; }
.cli-muted { color: #5C5549; }
.cli-result { color: #9A958E; }
.cli-highlight { color: #D8D4CC; }
.cli-cursor {
  display: inline-block;
  width: 0.55em;
  height: 1.1em;
  background: #D8D4CC;
  vertical-align: text-bottom;
  animation: cli-blink 1s step-end infinite;
}
@keyframes cli-blink {
  50% { opacity: 0; }
}
@keyframes cli-fade-in {
  from { opacity: 0; transform: translateY(2px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ---- Diagram ---- */
.diagram {
  font-family: var(--mono);
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-3);
  padding: 1.5rem 0;
}
.diagram-layer {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  padding: 0.6rem 0;
}
.diagram-label {
  font-weight: 600;
  color: var(--text);
  min-width: 8.5rem;
  flex-shrink: 0;
}
.diagram-desc {
  color: var(--text-3);
}
.diagram-arrow {
  color: var(--text-4);
  padding: 0.15rem 0 0.15rem 4rem;
  font-size: 13px;
}

/* ---- Stack Layers ---- */
.stack {
  display: flex;
  flex-direction: column;
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: 4px;
  overflow: hidden;
}
.stack-layer {
  display: flex;
  align-items: flex-start;
  gap: 1.5rem;
  padding: 1.5rem 1.75rem;
  background: var(--surface);
}
.stack-num {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--text-4);
  flex-shrink: 0;
  padding-top: 0.2rem;
}
.stack-content {
  flex: 1;
}
.stack-name {
  font-family: var(--mono);
  font-size: 16px;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 0.15rem;
}
.stack-tagline {
  font-family: var(--sans);
  font-size: 15px;
  color: var(--text-2);
  margin-bottom: 0.35rem;
}
.stack-detail {
  font-family: var(--sans);
  font-size: 14px;
  color: var(--text-3);
  line-height: 1.65;
}
.stack-layer--intent { border-left: 3px solid var(--text); }
.stack-layer--knowledge { border-left: 3px solid var(--text-2); }
.stack-layer--engine { border-left: 3px solid var(--text-3); }
.stack-layer--machine { border-left: 3px solid var(--text-4); }

/* ---- Capsule Grid ---- */
.capsule-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: 4px;
  overflow: hidden;
  margin-bottom: 2rem;
}
.capsule-card {
  background: var(--surface);
  padding: 1.5rem 1.75rem;
}
.capsule-name {
  font-family: var(--mono);
  font-size: 16px;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 0.35rem;
}
.capsule-intent {
  font-family: var(--sans);
  font-size: 15px;
  color: var(--text-2);
  line-height: 1.55;
  margin-bottom: 0.5rem;
}
.capsule-skills {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--text-4);
  line-height: 1.55;
}

/* ---- Triggers ---- */
.triggers {
  display: flex;
  flex-direction: column;
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: 4px;
  overflow: hidden;
  margin: 1rem 0;
}
.trigger {
  display: flex;
  align-items: baseline;
  gap: 1.25rem;
  padding: 0.75rem 1.25rem;
  background: var(--surface);
}
.trigger-name {
  font-family: var(--mono);
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
  min-width: 6rem;
  flex-shrink: 0;
}
.trigger-desc {
  font-family: var(--sans);
  font-size: 14px;
  color: var(--text-3);
  line-height: 1.55;
}
.trigger-desc code {
  font-family: var(--mono);
  font-size: 13px;
  background: var(--bg);
  border: 1px solid var(--border);
  padding: 0.1em 0.35em;
  border-radius: 3px;
}

/* ---- Back Link ---- */
.back {
  font-family: var(--mono);
  font-size: 14px;
  color: var(--text-4);
  text-decoration: none;
  display: inline-block;
  margin-top: 2rem;
}
.back:hover { color: var(--text); }

/* ---- Responsive ---- */
@media (max-width: 768px) {
  .nav { padding: 1rem 1.5rem 0; }
  .page { padding: 0 1.5rem; }
  .cards { grid-template-columns: 1fr; }
  .capsule-grid { grid-template-columns: 1fr; }
  .steps { grid-template-columns: 1fr; gap: 1.5rem; }
}

@media (max-width: 480px) {
  .hero { padding-top: 6vh; }
  .nav { padding-top: 1rem; }
  .nav-links { gap: 1rem; }
  .email-form { flex-direction: column; }
  .email-form button { padding: 0.9rem; }
  .step { flex-direction: column; gap: 0.25rem; }
  .diagram-layer { flex-direction: column; gap: 0.15rem; }
  .diagram-arrow { padding-left: 0; }
  .trigger { flex-direction: column; gap: 0.25rem; }
  .trigger-name { min-width: 0; }
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #141210;
    --surface: #1E1C18;
    --text: #D8D4CC;
    --text-2: #A8A29E;
    --text-3: #7A756E;
    --text-4: #5C5549;
    --border: #302C26;
    --accent: #D8D4CC;
  }
  ::selection { background: rgba(216,212,204,0.3); color: var(--text); }
  .code-block { background: #0A0908; }
}