/* ═══════════════════════════════════════════════════════
   Constellagent Landing Page — "Celestial Cartography"
   ═══════════════════════════════════════════════════════ */

@property --border-angle {
  syntax: "<angle>";
  initial-value: 0deg;
  inherits: false;
}

@keyframes spin-border {
  to { --border-angle: 360deg; }
}

/* --- Tokens --- */
:root {
  --bg-deep:        #08090f;
  --bg-space:       #0d0e17;
  --bg-surface:     #13141b;
  --bg-raised:      #1a1b26;
  --border:         #1e1f2e;
  --border-lit:     #282a3a;
  --text-primary:   #c0caf5;
  --text-secondary: #8e95b4;
  --text-tertiary:  #565b7e;
  --text-bright:    #e0e6ff;
  --accent-blue:    #7aa2f7;
  --accent-cyan:    #7dcfff;
  --accent-purple:  #bb9af7;
  --accent-green:   #9ece6a;
  --accent-orange:  #ff9e64;
  --accent-red:     #f7768e;
  --accent-yellow:  #e0af68;

  --font-serif: 'Instrument Serif', Georgia, serif;
  --font-sans:  'Instrument Sans', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono:  'JetBrains Mono', 'SF Mono', 'Fira Code', monospace;
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  background: var(--bg-deep);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

/* --- Utility --- */
.mono {
  font-family: var(--font-mono);
}

/* --- Grain overlay --- */
.grain::after {
  content: '';
  position: fixed;
  inset: 0;
  z-index: 9999;
  pointer-events: none;
  opacity: 0.03;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='300' height='300'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.8' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='1'/%3E%3C/svg%3E");
  background-repeat: repeat;
  will-change: transform;
}

/* ═══════════════════════════════════════════════════════
   NAV
   ═══════════════════════════════════════════════════════ */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(8, 9, 15, 0.8);
  backdrop-filter: blur(12px) saturate(150%);
  -webkit-backdrop-filter: blur(12px) saturate(150%);
  border-bottom: 1px solid var(--border);
  transition: transform 0.3s ease;
}

.nav.nav-hidden {
  transform: translateY(-100%);
}

.nav-inner {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 24px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--text-bright);
}

.nav-brand img {
  border-radius: 6px;
}

.nav-ctas {
  display: flex;
  gap: 8px;
}

.nav-links {
  display: flex;
  gap: 32px;
}

.nav-links a {
  font-size: 0.875rem;
  color: var(--text-secondary);
  transition: color 0.2s;
}

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

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 0.875rem;
  border: none;
  cursor: pointer;
  border-radius: 8px;
  padding: 12px 24px;
  transition: all 0.2s ease;
  white-space: nowrap;
  text-decoration: none;
  position: relative;
  z-index: 1;
}

.btn-sm {
  padding: 8px 16px;
  font-size: 0.8125rem;
  border-radius: 6px;
}

.btn-lg {
  padding: 16px 32px;
  font-size: 1rem;
}

.btn-primary {
  background: var(--accent-blue);
  color: var(--bg-deep);
}

.btn-primary:hover {
  background: #8ab4ff;
  box-shadow: 0 0 20px rgba(122, 162, 247, 0.2);
}

.btn-secondary {
  color: var(--text-primary);
  border: 1.5px solid transparent;
  border-radius: 8px;
  background:
    linear-gradient(var(--bg-deep), var(--bg-deep)) padding-box,
    conic-gradient(
      from var(--border-angle),
      rgba(202, 124, 95, 0.08) 0%,
      rgba(202, 124, 95, 0.4) 25%,
      rgba(202, 124, 95, 0.08) 50%,
      rgba(202, 124, 95, 0.4) 75%
    ) border-box;
  animation: spin-border 4s linear infinite;
  transition: box-shadow 0.3s ease, color 0.2s ease;
}

.btn-secondary:hover {
  color: var(--text-bright);
  box-shadow: 0 0 20px rgba(202, 124, 95, 0.15);
}

/* ═══════════════════════════════════════════════════════
   HERO
   ═══════════════════════════════════════════════════════ */
.hero {
  position: relative;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding-top: 140px;
  padding-bottom: 0;
  overflow: visible;
}

#constellation {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100vh;
  z-index: 0;
  will-change: transform;
}

.hero-grid {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100vh;
  z-index: 1;
  background-image:
    repeating-linear-gradient(90deg, rgba(86, 91, 126, 0.05) 0px, rgba(86, 91, 126, 0.05) 1px, transparent 1px, transparent 80px),
    repeating-linear-gradient(0deg, rgba(86, 91, 126, 0.05) 0px, rgba(86, 91, 126, 0.05) 1px, transparent 1px, transparent 80px);
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  max-width: 800px;
  padding: 0 24px;
}

.eyebrow {
  display: block;
  font-size: 0.75rem;
  color: var(--text-secondary);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 24px;
}

.hero h1 {
  font-family: var(--font-serif);
  font-style: italic;
  font-weight: 400;
  font-size: clamp(3rem, 7vw, 5.5rem);
  line-height: 1.1;
  color: var(--text-bright);
  margin-bottom: 24px;
  text-wrap: balance;
}

.hero h1 em {
  background: linear-gradient(135deg, var(--accent-blue), var(--accent-cyan), var(--accent-purple));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-sub {
  font-size: 1.125rem;
  color: var(--text-secondary);
  max-width: 560px;
  margin: 0 auto 40px;
  text-wrap: balance;
  line-height: 1.7;
}

.hero-ctas {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}

.hero-note {
  display: block;
  margin-top: 16px;
  color: var(--text-tertiary);
  font-size: 0.8125rem;
}

.hero-screenshot {
  margin-top: 56px;
  width: min(calc(100vw - 48px), 1060px);
  max-width: none;
  position: relative;
  left: 50%;
  transform: translateX(-50%);
}

/* ═══════════════════════════════════════════════════════
   SECTIONS (shared)
   ═══════════════════════════════════════════════════════ */
.section {
  padding: 120px 0;
}

.section-inner {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 24px;
}

.section-label {
  display: block;
  font-size: 0.75rem;
  color: var(--text-tertiary);
  letter-spacing: 0.1em;
  margin-bottom: 16px;
}

.section h2 {
  font-family: var(--font-serif);
  font-style: italic;
  font-weight: 400;
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  color: var(--text-bright);
  margin-bottom: 56px;
  text-wrap: balance;
}

/* ═══════════════════════════════════════════════════════
   FEATURES
   ═══════════════════════════════════════════════════════ */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.feature-card {
  position: relative;
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 28px 24px;
  overflow: hidden;
}

.feature-accent {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--accent);
}

.feature-icon {
  color: var(--accent);
  margin-bottom: 16px;
}

.feature-card h3 {
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 1rem;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.feature-card p {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ═══════════════════════════════════════════════════════
   APP PREVIEW
   ═══════════════════════════════════════════════════════ */
.app-window {
  margin: 0 auto;
  filter:
    drop-shadow(0 0 80px rgba(122, 162, 247, 0.08))
    drop-shadow(0 0 40px rgba(122, 162, 247, 0.05));
}

.window-screenshot {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 10px;
  -webkit-mask-image: linear-gradient(to bottom, #000 50%, transparent 85%);
  mask-image: linear-gradient(to bottom, #000 50%, transparent 85%);
}

/* ═══════════════════════════════════════════════════════
   HOW IT WORKS
   ═══════════════════════════════════════════════════════ */
.steps {
  display: flex;
  align-items: flex-start;
  gap: 0;
}

.step {
  flex: 1;
  position: relative;
  padding: 32px 24px;
}

.step-num {
  display: block;
  font-size: 4rem;
  font-weight: 500;
  color: var(--accent-blue);
  opacity: 0.15;
  line-height: 1;
  margin-bottom: 12px;
}

.step h3 {
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 1.1rem;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.step p {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.step-connector {
  width: 60px;
  flex-shrink: 0;
  border-top: 2px dashed rgba(122, 162, 247, 0.3);
  margin-top: 72px;
}

/* ═══════════════════════════════════════════════════════
   FINAL CTA
   ═══════════════════════════════════════════════════════ */
.section-cta {
  text-align: center;
  background:
    radial-gradient(ellipse 60% 50% at 50% 50%, rgba(122, 162, 247, 0.06), transparent),
    linear-gradient(to bottom, var(--bg-space), var(--bg-raised));
}

.cta-inner {
  max-width: 640px;
}

.section-cta h2 {
  margin-bottom: 16px;
}

.section-cta p {
  color: var(--text-secondary);
  margin-bottom: 32px;
  font-size: 1.1rem;
}

.cta-note {
  display: block;
  margin-top: 20px;
  font-size: 0.8125rem;
  color: var(--text-tertiary);
}

/* ═══════════════════════════════════════════════════════
   FOOTER
   ═══════════════════════════════════════════════════════ */
.footer {
  border-top: 1px solid var(--border);
  padding: 24px 0;
}

.footer-inner {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.8125rem;
  color: var(--text-tertiary);
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 8px;
}

.footer-brand img {
  border-radius: 4px;
  opacity: 0.6;
}

.footer a {
  transition: color 0.2s;
}

.footer a:hover {
  color: var(--text-secondary);
}

/* ═══════════════════════════════════════════════════════
   SCROLL ANIMATIONS
   ═══════════════════════════════════════════════════════ */
.animate-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.animate-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Feature card stagger */
.feature-card:nth-child(1) { transition-delay: 0ms; }
.feature-card:nth-child(2) { transition-delay: 80ms; }
.feature-card:nth-child(3) { transition-delay: 160ms; }
.feature-card:nth-child(4) { transition-delay: 240ms; }
.feature-card:nth-child(5) { transition-delay: 320ms; }
.feature-card:nth-child(6) { transition-delay: 400ms; }

/* Step stagger */
.step:nth-child(1) { transition-delay: 0ms; }
.step:nth-child(3) { transition-delay: 150ms; }
.step:nth-child(5) { transition-delay: 300ms; }

/* ═══════════════════════════════════════════════════════
   REDUCED MOTION
   ═══════════════════════════════════════════════════════ */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  html { scroll-behavior: auto; }

  .animate-in {
    opacity: 1;
    transform: none;
  }
}

/* ═══════════════════════════════════════════════════════
   RESPONSIVE
   ═══════════════════════════════════════════════════════ */

/* Tablet */
@media (max-width: 1024px) {
  .feature-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* Mobile */
@media (max-width: 768px) {
  .nav-links { display: none; }

  .nav-inner { height: 48px; }

  .hero h1 {
    font-size: clamp(2.25rem, 10vw, 3.5rem);
  }

  .hero-sub {
    font-size: 1rem;
  }

  .hero-ctas {
    flex-direction: column;
    align-items: center;
  }

  .section {
    padding: 80px 0;
  }

  .section h2 {
    margin-bottom: 40px;
  }

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

  .steps {
    flex-direction: column;
  }

  .step-connector {
    width: auto;
    height: 40px;
    border-top: none;
    border-left: 2px dashed rgba(122, 162, 247, 0.3);
    margin-top: 0;
    margin-left: 48px;
  }

}