/* assets/css/design-system.css */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Space+Grotesk:wght@400;500;600;700&display=swap');

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

:root {
  /* Stitch-aligned surface system */
  --bg-primary:    #0b0e14;
  --bg-secondary:  #10131a;
  --bg-card:       #161a21;
  --bg-card-hover: #1c2028;
  --bg-elevated:   #22262f;
  --text-primary:  #ecedf6;
  --text-secondary: #a9abb3;
  --text-muted:    rgba(255,255,255,0.35);
  --border:        rgba(255,255,255,0.06);
  --border-hover:  rgba(255,255,255,0.12);

  /* Brand gradient — more vibrant */
  --grad-start: #7C4DFF;
  --grad-mid:   #00D4EC;
  --grad-end:   #81ECFF;
  --gradient:   linear-gradient(135deg, var(--grad-start), var(--grad-mid), var(--grad-end));
  --gradient-hover: linear-gradient(135deg, var(--grad-start), var(--grad-end));

  /* Accent glow */
  --glow-purple: rgba(124, 77, 255, 0.15);
  --glow-cyan:   rgba(0, 212, 236, 0.15);

  /* Typography */
  --font: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-display: 'Space Grotesk', 'Inter', sans-serif;
  --text-xs:   0.8125rem;
  --text-sm:   0.9375rem;
  --text-base: 1.0625rem;
  --text-lg:   1.25rem;
  --text-xl:   1.375rem;
  --text-2xl:  1.625rem;
  --text-3xl:  2rem;
  --text-4xl:  2.75rem;
  --text-5xl:  3.75rem;
  --text-6xl:  5rem;

  /* Spacing */
  --space-xs:  0.5rem;
  --space-sm:  1rem;
  --space-md:  1.5rem;
  --space-lg:  2.5rem;
  --space-xl:  4rem;
  --space-2xl: 7rem;

  /* Radius */
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;

  /* Transitions */
  --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.45s cubic-bezier(0.4, 0, 0.2, 1);
}

html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  background: var(--bg-primary);
  color: var(--text-primary);
  font-size: var(--text-base);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* Headlines use Space Grotesk */
h1, h2, h3, .hero-title, .section-title, .trust-card-title, .sell-step-title,
.market-stat-value, .stat-value {
  font-family: var(--font-display);
}

/* Gradient text utility */
.gradient-text {
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  text-shadow: none;
  filter: drop-shadow(0 2px 8px rgba(0,0,0,0.3));
}

/* Gradient border utility — uses ghost border approach */
.gradient-border {
  position: relative;
}
.gradient-border::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  padding: 1px;
  background: var(--gradient);
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  pointer-events: none;
  opacity: 0;
  transition: opacity var(--transition);
}
.gradient-border:hover::before {
  opacity: 1;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.85rem 1.85rem;
  border-radius: var(--radius-sm);
  font-family: var(--font);
  font-size: var(--text-base);
  font-weight: 600;
  letter-spacing: 0.01em;
  text-decoration: none;
  cursor: pointer;
  border: none;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}
.btn-primary {
  background: var(--gradient);
  color: #0b0e14;
  box-shadow: 0 0 20px var(--glow-purple), 0 0 40px var(--glow-cyan);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 30px var(--glow-purple), 0 0 60px var(--glow-cyan);
}

.btn-outline {
  background: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border-hover);
}
.btn-outline:hover {
  border-color: var(--grad-end);
  color: var(--grad-end);
  box-shadow: 0 0 20px var(--glow-cyan);
}

.btn-call {
  background: transparent;
  color: var(--grad-end);
  border: 1px solid rgba(129, 236, 255, 0.3);
  padding: 0.6rem 1.25rem;
  font-size: var(--text-sm);
  border-radius: var(--radius-sm);
}
.btn-call:hover { background: rgba(0,212,236,0.08); box-shadow: 0 0 15px var(--glow-cyan); }

/* Section */
.section { padding: var(--space-2xl) var(--space-lg); }
.section-inner { max-width: 1200px; margin: 0 auto; }
.section-label {
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--grad-end);
  margin-bottom: var(--space-sm);
}
.section-title {
  font-family: var(--font-display);
  font-size: var(--text-4xl);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-md);
}
.section-subtitle {
  font-size: var(--text-lg);
  color: var(--text-secondary);
  max-width: 600px;
  line-height: 1.7;
}

/* Divider */
.divider {
  width: 100%;
  height: 1px;
  background: var(--border);
}

/* Container */
.container { max-width: 1200px; margin: 0 auto; padding: 0 var(--space-lg); }

/* Pixel grid background texture */
.pixel-grid {
  background-image: radial-gradient(circle, rgba(129,236,255,0.03) 1px, transparent 1px);
  background-size: 16px 16px;
}

/* Prevent horizontal scroll without breaking position:sticky */
html { overflow-x: clip; }

/* Responsive */
@media (max-width: 768px) {
  :root {
    --text-4xl: 2rem;
    --text-5xl: 2.75rem;
    --text-6xl: 3.25rem;
    --space-2xl: 4rem;
    --space-xl: 2.5rem;
  }
  .section { padding-left: 0; padding-right: 0; }
  .container { padding-left: var(--space-sm); padding-right: var(--space-sm); }
  .section-inner { padding-left: var(--space-sm); padding-right: var(--space-sm); }
}