:root {
  --bg: #FAF8F5;
  --bg-subdued: #F3EFEA;
  --surface: #FFFFFF;
  --surface-border: #E5DFD5;
  --surface-border-strong: #D2C9BD;
  --ink-primary: #16171A;
  --ink-secondary: #565B66;
  --ink-muted: #868C98;
  --accent: #C85A32;
  --accent-light: #FBF1EC;
  --accent-dark: #A6421E;
  --emerald: #227B4E;
  --emerald-bg: #EEF8F2;
  --amber: #B86B00;
  --amber-bg: #FEF6E8;
  --blue: #2563EB;
  --blue-bg: #EFF5FF;
  --font-serif: "Newsreader", "Charter", "Georgia", serif;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  --container-max: 1180px;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #121316;
    --bg-subdued: #1A1C21;
    --surface: #1E2027;
    --surface-border: #2C2F38;
    --surface-border-strong: #3F4450;
    --ink-primary: #F3F1EC;
    --ink-secondary: #A0A5B2;
    --ink-muted: #6B7180;
    --accent: #E06D44;
    --accent-light: #2E1C15;
    --accent-dark: #F0855E;
    --emerald-bg: #14281E;
    --amber-bg: #2B2011;
    --blue-bg: #15243E;
  }
}

:root[data-theme="dark"] {
  --bg: #121316;
  --bg-subdued: #1A1C21;
  --surface: #1E2027;
  --surface-border: #2C2F38;
  --surface-border-strong: #3F4450;
  --ink-primary: #F3F1EC;
  --ink-secondary: #A0A5B2;
  --ink-muted: #6B7180;
  --accent: #E06D44;
  --accent-light: #2E1C15;
  --accent-dark: #F0855E;
  --emerald-bg: #14281E;
  --amber-bg: #2B2011;
  --blue-bg: #15243E;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  background-color: var(--bg);
  color: var(--ink-primary);
  font-family: var(--font-sans);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Header & Nav */
header.site-header {
  border-bottom: 1px solid var(--surface-border);
  background: var(--bg);
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(8px);
}

.header-container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 1rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand-link {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: var(--ink-primary);
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: -0.02em;
}

.brand-icon {
  width: 32px;
  height: 32px;
  background: var(--accent);
  color: #fff;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 1.1rem;
}

nav.main-nav {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

nav.main-nav a {
  text-decoration: none;
  color: var(--ink-secondary);
  font-size: 0.92rem;
  font-weight: 500;
  transition: color 0.15s ease;
}

nav.main-nav a:hover, nav.main-nav a.active {
  color: var(--ink-primary);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.6rem 1.1rem;
  font-size: 0.9rem;
  font-weight: 600;
  border-radius: 6px;
  text-decoration: none;
  transition: all 0.15s ease;
  cursor: pointer;
}

.btn-primary {
  background: var(--accent);
  color: #FFFFFF;
  border: 1px solid var(--accent);
}

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

.btn-outline {
  background: transparent;
  color: var(--ink-primary);
  border: 1px solid var(--surface-border-strong);
}

.btn-outline:hover {
  background: var(--surface-border);
}

.theme-toggle-btn {
  background: transparent;
  border: 1px solid var(--surface-border);
  color: var(--ink-secondary);
  width: 36px;
  height: 36px;
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
}

/* Main Container */
main {
  flex: 1;
}

.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 3rem 1.5rem;
}

/* Hero Section */
.hero {
  padding: 5rem 0 3.5rem;
  text-align: center;
}

.pill-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.35rem 0.85rem;
  background: var(--accent-light);
  color: var(--accent);
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  margin-bottom: 1.5rem;
}

.hero h1 {
  font-size: clamp(2.4rem, 5vw, 3.8rem);
  font-weight: 800;
  letter-spacing: -0.04em;
  line-height: 1.15;
  max-width: 840px;
  margin: 0 auto 1.5rem;
}

.hero p.lead {
  font-size: 1.18rem;
  color: var(--ink-secondary);
  max-width: 660px;
  margin: 0 auto 2.5rem;
  line-height: 1.6;
}

.hero-cta {
  display: flex;
  justify-content: center;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 3.5rem;
}

/* Interactive Preview Box */
.preview-window {
  background: var(--surface);
  border: 1px solid var(--surface-border);
  border-radius: 12px;
  box-shadow: 0 12px 36px rgba(0,0,0,0.06);
  overflow: hidden;
  max-width: 1020px;
  margin: 0 auto;
}

.window-header {
  background: var(--bg-subdued);
  padding: 0.75rem 1.25rem;
  border-bottom: 1px solid var(--surface-border);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--surface-border-strong);
}

.window-title {
  margin-left: 0.5rem;
  font-size: 0.8rem;
  font-family: var(--font-mono);
  color: var(--ink-muted);
}

.preview-body {
  padding: 1.5rem;
}

/* Pipeline Stage Demo Cards */
.pipeline-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1rem;
  text-align: left;
}

.stage-col {
  background: var(--bg);
  border: 1px solid var(--surface-border);
  border-radius: 8px;
  padding: 1rem;
}

.stage-title {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.75rem;
  color: var(--ink-secondary);
}

.sample-card {
  background: var(--surface);
  border: 1px solid var(--surface-border);
  border-radius: 6px;
  padding: 0.85rem;
  margin-bottom: 0.75rem;
  box-shadow: 0 2px 6px rgba(0,0,0,0.02);
}

.sample-card h4 {
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 0.2rem;
}

.sample-card p.role {
  font-size: 0.82rem;
  color: var(--ink-secondary);
  margin-bottom: 0.5rem;
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
}

.tag {
  font-size: 0.7rem;
  padding: 0.15rem 0.45rem;
  background: var(--bg-subdued);
  border-radius: 4px;
  color: var(--ink-secondary);
  font-weight: 500;
}

/* Features Grid */
.features-section {
  padding: 5rem 0;
  border-top: 1px solid var(--surface-border);
}

.section-head {
  text-align: center;
  max-width: 640px;
  margin: 0 auto 3.5rem;
}

.section-head h2 {
  font-size: 2.2rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 0.75rem;
}

.section-head p {
  color: var(--ink-secondary);
  font-size: 1.05rem;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 2rem;
}

.feature-card {
  background: var(--surface);
  border: 1px solid var(--surface-border);
  border-radius: 10px;
  padding: 2rem;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.feature-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0,0,0,0.04);
}

.feature-icon {
  width: 44px;
  height: 44px;
  background: var(--accent-light);
  color: var(--accent);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  margin-bottom: 1.25rem;
}

.feature-card h3 {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.feature-card p {
  color: var(--ink-secondary);
  font-size: 0.92rem;
  line-height: 1.55;
}

/* Privacy Callout */
.privacy-banner {
  background: var(--bg-subdued);
  border: 1px solid var(--surface-border);
  border-radius: 12px;
  padding: 3rem 2rem;
  margin: 4rem 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  flex-wrap: wrap;
}

.privacy-banner h3 {
  font-size: 1.6rem;
  font-weight: 800;
  margin-bottom: 0.5rem;
}

.privacy-banner p {
  color: var(--ink-secondary);
  max-width: 600px;
  font-size: 0.95rem;
}

/* Footer */
footer.site-footer {
  border-top: 1px solid var(--surface-border);
  background: var(--surface);
  padding: 3rem 0 2rem;
  margin-top: auto;
}

.footer-container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1.5rem;
}

.footer-links {
  display: flex;
  gap: 1.5rem;
}

.footer-links a {
  text-decoration: none;
  color: var(--ink-secondary);
  font-size: 0.88rem;
}

.footer-links a:hover {
  color: var(--ink-primary);
}

.footer-copy {
  font-size: 0.85rem;
  color: var(--ink-muted);
}

/* Responsive */
@media (max-width: 768px) {
  nav.main-nav {
    display: none;
  }
  .hero h1 {
    font-size: 2.2rem;
  }
}