/* ============================================================
   AgentContext — Design System
   Editorial warmth. Generous whitespace. Human-first.
   Instrument Serif (display) + system sans (body)
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Instrument+Serif:ital@0;1&display=swap');

:root {
  /* Palette */
  --bg-warm:       #FAF9F6;
  --bg-warm-alt:   #F4F3EF;
  --bg-primary:    #0A0A09;
  --bg-surface:    #111110;
  --bg-elevated:   #1A1A18;
  --text-primary:  #F5F5F4;
  --text-secondary:#A8A29E;
  --text-muted:    #78716C;
  --text-dim:      #57534E;
  --text-body:     #44403C;
  --text-dark:     #292524;
  --accent:        #0F766E;
  --accent-light:  #5DCAA5;
  --border-dark:   rgba(255,255,255,0.06);
  --border-light:  #E7E5E0;

  /* Typography */
  --font-display: 'Instrument Serif', Georgia, serif;
  --font-body:    -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;

  /* Spacing */
  --space-xs:  4px;
  --space-sm:  8px;
  --space-md:  16px;
  --space-lg:  24px;
  --space-xl:  48px;
  --space-2xl: 80px;
  --space-3xl: 120px;

  /* Layout */
  --container-max: 1080px;
  --radius:        8px;
  --radius-lg:     10px;
  --nav-height:    64px;
}

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

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  scroll-behavior: smooth;
  scroll-padding-top: var(--nav-height);
}

body {
  font-family: var(--font-body);
  background: var(--bg-warm);
  color: var(--text-dark);
  line-height: 1.75;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }

.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

/* ---- Navigation ---- */
.site-nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  background: rgba(250,249,246,0.92);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-light);
}

.nav-inner {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-lg);
  height: var(--nav-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  display: flex;
  align-items: center;
  font-family: var(--font-display);
  font-size: 18px;
  color: var(--text-dark);
  letter-spacing: -0.3px;
}

.nav-logo-dot {
  display: inline-block;
  width: 5px; height: 5px;
  border-radius: 50%;
  background: var(--accent);
  margin: 0 5px;
  vertical-align: middle;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 36px;
}

.nav-links a {
  font-size: 14px;
  color: var(--text-dim);
  transition: color 0.2s;
}

.nav-links a:hover { color: var(--text-dark); }

.nav-links a.nav-cta {
  padding: 8px 20px;
  border-radius: 6px;
  background: var(--text-dark);
  color: var(--bg-warm);
  font-weight: 500;
  font-size: 13px;
  transition: opacity 0.2s;
}

.nav-links a.nav-cta:hover { opacity: 0.8; }

/* Hamburger */
.nav-hamburger {
  display: none;
  background: none; border: none;
  cursor: pointer;
  width: 24px; height: 18px;
  position: relative;
}

.nav-hamburger span {
  display: block; width: 100%; height: 1.5px;
  background: var(--text-dark);
  position: absolute; left: 0;
  transition: transform 0.25s, opacity 0.2s;
}

.nav-hamburger span:nth-child(1) { top: 0; }
.nav-hamburger span:nth-child(2) { top: 8px; }
.nav-hamburger span:nth-child(3) { top: 16px; }

.nav-hamburger.open span:nth-child(1) { transform: translateY(8px) rotate(45deg); }
.nav-hamburger.open span:nth-child(2) { opacity: 0; }
.nav-hamburger.open span:nth-child(3) { transform: translateY(-8px) rotate(-45deg); }

/* Mobile overlay */
.nav-mobile-overlay {
  display: none;
  position: fixed;
  top: var(--nav-height); left: 0; right: 0; bottom: 0;
  background: var(--bg-warm);
  padding: var(--space-xl) var(--space-lg);
  z-index: 99;
  flex-direction: column;
}

.nav-mobile-overlay.open { display: flex; }

.nav-mobile-overlay a {
  font-size: 20px;
  font-family: var(--font-display);
  color: var(--text-dim);
  padding: 16px 0;
  border-bottom: 1px solid var(--border-light);
  transition: color 0.2s;
}

.nav-mobile-overlay a:hover { color: var(--text-dark); }

@media (max-width: 768px) {
  .nav-links { display: none; }
  .nav-hamburger { display: block; }
}

/* ---- Typography ---- */
.display-xl {
  font-family: var(--font-display);
  font-size: clamp(2.25rem, 5.5vw, 3.5rem);
  line-height: 1.1;
  font-weight: 400;
  letter-spacing: -0.5px;
  color: var(--text-dark);
}

.display-lg {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 3.5vw, 2.5rem);
  line-height: 1.15;
  font-weight: 400;
  letter-spacing: -0.3px;
}

.body-lg {
  font-size: 17px;
  line-height: 1.75;
  color: var(--text-body);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 11px;
  letter-spacing: 2px;
  text-transform: uppercase;
  font-weight: 500;
  color: var(--text-muted);
}

.eyebrow-dot {
  width: 5px; height: 5px;
  border-radius: 50%;
  background: var(--accent);
  flex-shrink: 0;
}

/* ---- Sections ---- */
.section-warm {
  background: var(--bg-warm);
  color: var(--text-dark);
  padding: var(--space-3xl) 0;
}

.section-warm-alt {
  background: var(--bg-warm-alt);
  color: var(--text-dark);
  padding: var(--space-3xl) 0;
}

.section-header {
  margin-bottom: var(--space-xl);
}

.section-header .eyebrow {
  margin-bottom: var(--space-md);
}

.section-header h2 {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 3vw, 2.25rem);
  font-weight: 400;
  line-height: 1.15;
  max-width: 600px;
}

.section-header .section-sub {
  font-size: 16px;
  color: var(--text-body);
  margin-top: var(--space-sm);
  max-width: 520px;
}

/* Wave Hero */
.wave-hero {
  padding: calc(var(--nav-height) + 64px) 0 0;
  background: var(--bg-warm);
}

/* Manifesto */
.manifesto {
  background: var(--bg-warm);
  padding: var(--space-3xl) 0;
}

.manifesto-content {
  max-width: 720px;
  text-align: center;
  margin: 0 auto;
}

.manifesto-content .wave-editorial {
  margin-bottom: var(--space-xl);
}

.manifesto-content .display-xl {
  margin-bottom: var(--space-lg);
}

.manifesto-content .body-lg {
  margin-bottom: var(--space-xl);
  max-width: 560px;
  margin-left: auto;
  margin-right: auto;
}

/* ---- Buttons ---- */
.btn {
  display: inline-block;
  padding: 14px 32px;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: opacity 0.2s;
  border: none;
  text-align: center;
}

.btn-primary {
  background: var(--text-dark);
  color: var(--bg-warm);
}

.btn-primary:hover { opacity: 0.8; }

.btn-group {
  display: flex;
  gap: var(--space-md);
  flex-wrap: wrap;
}

/* ---- Wave Comparison ---- */
.wave-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-lg);
  margin-bottom: var(--space-xl);
}

.wave-card {
  background: #fff;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 32px;
}

.wave-card h3 {
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 400;
  margin-bottom: 4px;
  color: var(--text-dark);
}

.wave-card .wave-subtitle {
  font-size: 14px;
  font-style: italic;
  color: var(--text-muted);
  margin-bottom: var(--space-lg);
}

.wave-card svg {
  width: 100%;
  height: auto;
}

.wave-card .wave-summary {
  font-size: 14px;
  font-style: italic;
  color: var(--text-muted);
  margin-top: var(--space-lg);
  text-align: center;
}

.wave-editorial {
  text-align: center;
  font-family: var(--font-display);
  font-size: clamp(1.25rem, 2.5vw, 1.75rem);
  color: var(--text-dark);
}

/* ---- Cards ---- */
.card-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-lg);
}

.card {
  background: #fff;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 32px;
  border-left: 3px solid var(--border-light);
}

.card h3 {
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 400;
  margin-bottom: var(--space-sm);
  color: var(--text-dark);
}

.card p {
  font-size: 15px;
  line-height: 1.7;
  color: var(--text-body);
}

.card-teal   { border-left-color: #0F766E; }
.card-amber  { border-left-color: #D97706; }

/* ---- About ---- */
.about-content {
  max-width: 580px;
}

.about-content h2 {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 3vw, 2.25rem);
  font-weight: 400;
  margin-bottom: var(--space-md);
  color: var(--text-dark);
}

.about-content p {
  font-size: 16px;
  line-height: 1.75;
  color: var(--text-body);
}

/* ---- CTA Section ---- */
.section-cta {
  background: var(--bg-warm-alt);
  padding: var(--space-3xl) 0;
  text-align: center;
}

.cta-content {
  max-width: 520px;
  margin: 0 auto;
}

.cta-content h2 {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 3vw, 2.25rem);
  font-weight: 400;
  margin-bottom: var(--space-md);
  color: var(--text-dark);
}

.cta-content p {
  color: var(--text-body);
  font-size: 16px;
  line-height: 1.75;
  margin-bottom: var(--space-xl);
}

/* ---- Footer ---- */
.site-footer {
  background: var(--bg-warm-alt);
  border-top: 1px solid var(--border-light);
  padding: var(--space-xl) 0 0;
}

.footer-inner {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-lg) var(--space-lg);
  display: flex;
  justify-content: space-between;
  gap: var(--space-xl);
  flex-wrap: wrap;
}

.footer-brand {
  max-width: 320px;
}

.footer-logo {
  font-family: 'DM Serif Display', serif;
  font-size: 1.15rem;
  color: var(--text-dark);
  margin-bottom: 0.5rem;
  display: flex;
  align-items: center;
}

.footer-tagline {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.6;
}

.footer-links {
  display: flex;
  gap: var(--space-xl);
}

.footer-link-group h4 {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-dark);
  margin-bottom: 0.75rem;
  font-weight: 600;
}

.footer-link-group a {
  display: block;
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 0.4rem;
  transition: color 0.2s;
}

.footer-link-group a:hover { color: var(--text-dark); }

.footer-bottom {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: var(--space-md) var(--space-lg);
  border-top: 1px solid var(--border-light);
  font-size: 12px;
  color: var(--text-muted);
}

/* ---- Scroll Animations ---- */
.animate-on-scroll {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.animate-on-scroll.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.animate-delay-1 { transition-delay: 0.1s; }
.animate-delay-2 { transition-delay: 0.2s; }
.animate-delay-3 { transition-delay: 0.3s; }

/* ---- Responsive ---- */
@media (max-width: 768px) {
  :root { --space-3xl: 80px; }

  .hero { padding: 130px 0 var(--space-2xl); }

  .wave-grid { grid-template-columns: 1fr; }

  .card-grid { grid-template-columns: 1fr; }

  .footer-inner {
    flex-direction: column;
    gap: var(--space-md);
    text-align: center;
  }

  .btn-group {
    flex-direction: column;
    align-items: stretch;
  }

  .btn { text-align: center; }
}