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

html {
  scroll-behavior: smooth;
  overflow-x: hidden;
}

html, body {
  width: 100%;
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--bg-dark);
  color: var(--text-light);
}

body {
  --mouse-x: 0.5;
  --mouse-y: 0.5;
}

/* Graph paper grid with cursor-clearing effect */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background:
    repeating-linear-gradient(to right, rgba(0,0,0,0.06) 0px, rgba(0,0,0,0.06) 1px, transparent 1px, transparent 40px),
    repeating-linear-gradient(to bottom, rgba(0,0,0,0.06) 0px, rgba(0,0,0,0.06) 1px, transparent 1px, transparent 40px);
  -webkit-mask-image: radial-gradient(300px circle at calc(var(--mouse-x)*100%) calc(var(--mouse-y)*100%), transparent 0%, transparent 30%, rgba(0,0,0,0.4) 50%, black 70%);
  mask-image: radial-gradient(300px circle at calc(var(--mouse-x)*100%) calc(var(--mouse-y)*100%), transparent 0%, transparent 30%, rgba(0,0,0,0.4) 50%, black 70%);
}

@media (prefers-reduced-motion: reduce) {
  body::before {
    -webkit-mask-image: none;
    mask-image: none;
  }
}

/* Main content */
.main {
  position: relative;
  z-index: 10;
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
}

/* Section base */
.section {
  width: 100%;
  max-width: var(--content-max-width);
  margin: 0 auto;
  padding: var(--section-padding);
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s ease-out, transform 0.7s ease-out;
}

.section.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Hero section — centered layout */
.hero-section {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 48px;
  padding-top: 120px;
  padding-bottom: 80px;
  opacity: 1;
  transform: none;
}

/* Section divider */
.section-divider {
  width: 100%;
  max-width: var(--content-max-width);
  margin: 0 auto;
  height: 1px;
  background: var(--border-dark);
}

/* Responsive */
@media (max-width: 900px) {
  body::before {
    -webkit-mask-image: none;
    mask-image: none;
  }

  .section {
    padding: 80px 30px;
  }

  .hero-section {
    padding-top: 80px;
    padding-bottom: 60px;
  }
}

@media (max-width: 600px) {
  .section {
    padding: 60px 20px;
  }

  .hero-section {
    padding-top: 100px;
    padding-bottom: 40px;
  }
}