/* Reset & Base */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --color-bg: #ffffff;
  --color-text: #1a1a2e;
  --color-text-light: #555568;
  --color-primary: #4f46e5;
  --color-primary-dark: #3730a3;
  --color-primary-light: #e0e7ff;
  --color-border: #e5e7eb;
  --color-surface: #f9fafb;
  --color-agent-bg: #f0f1f5;
  --radius: 8px;
  --shadow: 0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.06);
  --shadow-lg: 0 10px 25px rgba(0,0,0,0.08);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 24px;
}

a { color: var(--color-primary); text-decoration: none; }
a:hover { color: var(--color-primary-dark); }

/* Buttons */
.btn {
  display: inline-block;
  padding: 10px 24px;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 0.95rem;
  transition: all 0.2s;
  cursor: pointer;
  border: 2px solid transparent;
}
.btn-primary {
  background: var(--color-primary);
  color: #fff;
  border-color: var(--color-primary);
}
.btn-primary:hover {
  background: var(--color-primary-dark);
  border-color: var(--color-primary-dark);
  color: #fff;
}
.btn-outline {
  background: transparent;
  color: var(--color-primary);
  border-color: var(--color-primary);
}
.btn-outline:hover {
  background: var(--color-primary);
  color: #fff;
}
.btn-sm { padding: 6px 16px; font-size: 0.85rem; }

/* Nav */
.nav {
  padding: 16px 0;
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(8px);
  z-index: 100;
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.logo {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--color-text);
}
.logo:hover { color: var(--color-text); }
.logo-icon {
  color: var(--color-primary);
  margin-right: 2px;
}
.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
}
.nav-links a { color: var(--color-text-light); font-size: 0.9rem; font-weight: 500; }
.nav-links a:hover { color: var(--color-primary); }
.nav-links .btn { color: #fff; }
.nav-links .btn:hover { color: #fff; }

/* Hero */
.hero {
  padding: 80px 0 60px;
  text-align: center;
}
.hero h1 {
  font-size: 3rem;
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 20px;
  letter-spacing: -0.02em;
}
.hero-sub {
  font-size: 1.2rem;
  color: var(--color-text-light);
  max-width: 640px;
  margin: 0 auto 32px;
}
.hero-cta {
  display: flex;
  gap: 16px;
  justify-content: center;
  margin-bottom: 20px;
}
.hero-proof {
  font-size: 0.85rem;
  color: var(--color-text-light);
}

/* Features */
.features {
  padding: 80px 0;
  background: var(--color-surface);
}
.features h2 {
  text-align: center;
  font-size: 2rem;
  margin-bottom: 48px;
}
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 32px;
}
.feature-card {
  background: #fff;
  padding: 32px 24px;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}
.feature-icon {
  font-size: 2rem;
  margin-bottom: 12px;
}
.feature-card h3 {
  font-size: 1.1rem;
  margin-bottom: 8px;
}
.feature-card p {
  color: var(--color-text-light);
  font-size: 0.92rem;
}

/* Pricing */
.pricing {
  padding: 80px 0;
}
.pricing h2 {
  text-align: center;
  font-size: 2rem;
  margin-bottom: 8px;
}
.pricing-sub {
  text-align: center;
  color: var(--color-text-light);
  margin-bottom: 48px;
  font-size: 1.05rem;
}
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
  align-items: start;
}
.pricing-card {
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 32px 28px;
  position: relative;
}
.pricing-featured {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-lg);
}
.pricing-badge {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--color-primary);
  color: #fff;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 4px 16px;
  border-radius: 20px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.pricing-card h3 {
  font-size: 1.2rem;
  margin-bottom: 8px;
}
.price {
  font-size: 2.4rem;
  font-weight: 800;
  margin-bottom: 24px;
}
.price span {
  font-size: 0.9rem;
  font-weight: 400;
  color: var(--color-text-light);
}
.pricing-card ul {
  list-style: none;
  margin-bottom: 28px;
}
.pricing-card li {
  padding: 6px 0;
  font-size: 0.92rem;
  color: var(--color-text-light);
  border-bottom: 1px solid var(--color-border);
}
.pricing-card li:last-child { border-bottom: none; }
.pricing-card li::before {
  content: "\2713 ";
  color: var(--color-primary);
  font-weight: 700;
  margin-right: 6px;
}
.pricing-card .btn { width: 100%; text-align: center; }
.pricing-note {
  text-align: center;
  color: var(--color-text-light);
  font-size: 0.85rem;
  margin-top: 24px;
}

/* Why */
.why {
  padding: 80px 0;
  background: var(--color-surface);
}
.why h2 {
  text-align: center;
  font-size: 2rem;
  margin-bottom: 48px;
}
.why-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 32px;
}
.why-item h3 {
  font-size: 1.1rem;
  margin-bottom: 8px;
}
.why-item p {
  color: var(--color-text-light);
  font-size: 0.92rem;
}

/* Agent section (Mechanism C) -- visible but understated */
.agent-section {
  padding: 48px 0;
  background: var(--color-agent-bg);
  border-top: 1px solid var(--color-border);
}
.agent-section h2 {
  font-size: 1.2rem;
  color: var(--color-text-light);
  margin-bottom: 12px;
}
.agent-section p {
  font-size: 0.88rem;
  color: var(--color-text-light);
  max-width: 720px;
  margin-bottom: 12px;
}
.agent-code {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 12px 16px;
  margin: 12px 0;
  max-width: 720px;
  overflow-x: auto;
}
.agent-code code {
  font-family: 'SF Mono', 'Fira Code', 'Fira Mono', Menlo, monospace;
  font-size: 0.82rem;
  color: var(--color-primary-dark);
  word-break: break-all;
}
.agent-params {
  font-size: 0.82rem !important;
  color: #888 !important;
}
.agent-links {
  list-style: none;
  margin: 12px 0;
  max-width: 720px;
}
.agent-links li {
  padding: 6px 0;
  font-size: 0.85rem;
  color: var(--color-text-light);
  border-bottom: 1px solid var(--color-border);
}
.agent-links li:last-child { border-bottom: none; }
.agent-links a {
  color: var(--color-primary-dark);
  font-weight: 600;
}
.agent-steps {
  margin: 16px 0;
  padding-left: 20px;
  max-width: 720px;
}
.agent-steps li {
  padding: 6px 0;
  font-size: 0.88rem;
  color: var(--color-text-light);
}
.agent-steps code {
  font-family: 'SF Mono', Menlo, monospace;
  font-size: 0.82rem;
  color: var(--color-primary-dark);
  background: #fff;
  padding: 2px 6px;
  border-radius: 4px;
}

/* Footer */
.footer {
  padding: 48px 0 24px;
  border-top: 1px solid var(--color-border);
}
.footer-inner {
  display: flex;
  flex-wrap: wrap;
  gap: 48px;
}
.footer-brand {
  flex: 1;
  min-width: 200px;
}
.footer-brand p {
  color: var(--color-text-light);
  font-size: 0.88rem;
  margin-top: 8px;
}
.footer-links {
  display: flex;
  gap: 64px;
}
.footer-links h4 {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-light);
  margin-bottom: 12px;
}
.footer-links a {
  display: block;
  color: var(--color-text-light);
  font-size: 0.88rem;
  padding: 3px 0;
}
.footer-links a:hover { color: var(--color-primary); }
.footer-bottom {
  width: 100%;
  padding-top: 24px;
  margin-top: 24px;
  border-top: 1px solid var(--color-border);
}
.footer-bottom p {
  font-size: 0.8rem;
  color: var(--color-text-light);
}

/* Responsive */
@media (max-width: 768px) {
  .hero h1 { font-size: 2rem; }
  .hero-sub { font-size: 1rem; }
  .hero-cta { flex-direction: column; align-items: center; }
  .nav-links a:not(.btn) { display: none; }
  .pricing-grid { grid-template-columns: 1fr; }
  .footer-links { gap: 32px; }
}