/**
 * NEVGO INSTITUTE V2 — BASE STYLES & RESET
 */

/* 1. Box Sizing & Reset */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

body {
  font-family: var(--font-sans);
  background-color: var(--color-parchment);
  color: var(--text-dark-primary);
  line-height: var(--lh-relaxed);
  overflow-x: hidden;
  position: relative;
  min-height: 100vh;
}

/* 2. Tactile Paper Grain Overlay */
.paper-grain-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  pointer-events: none;
  z-index: 9999;
  opacity: 0.035;
  mix-blend-mode: multiply;
}

/* 3. Typography Foundations */
h1, h2, h3, h4, .font-serif {
  font-family: var(--font-serif);
  font-weight: 500;
  letter-spacing: var(--tracking-tight);
  color: inherit;
}

h1 {
  font-size: var(--text-display);
  line-height: var(--lh-tight);
}

h2 {
  font-size: var(--text-h2);
  line-height: var(--lh-snug);
}

h3 {
  font-size: var(--text-h3);
  line-height: var(--lh-snug);
}

h4 {
  font-size: var(--text-h4);
  line-height: var(--lh-normal);
}

p {
  margin-bottom: var(--space-md);
}

p:last-child {
  margin-bottom: 0;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--duration-fast) var(--ease-smooth), opacity var(--duration-fast) var(--ease-smooth);
}

img, svg {
  display: block;
  max-width: 100%;
  height: auto;
}

button, input, textarea, select {
  font: inherit;
  color: inherit;
  background: none;
  border: none;
  outline: none;
}

button {
  cursor: pointer;
}

ul, ol {
  list-style: none;
}

/* 4. Container System */
.v2-container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--space-lg);
  padding-right: var(--space-lg);
}

.v2-container-narrow {
  width: 100%;
  max-width: var(--container-narrow);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--space-lg);
  padding-right: var(--space-lg);
}

.v2-container-wide {
  width: 100%;
  max-width: var(--container-wide);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--space-lg);
  padding-right: var(--space-lg);
}

/* 5. Theme Sections */
.theme-dark {
  background-color: var(--color-obsidian);
  color: var(--text-light-primary);
  position: relative;
}

.theme-forest {
  background-color: var(--color-forest-deep);
  color: var(--text-light-primary);
  position: relative;
}

.theme-alabaster {
  background-color: var(--color-alabaster);
  color: var(--text-dark-primary);
}

/* 6. Utility Classes */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.text-terracotta { color: var(--color-terracotta); }
.text-gold { color: var(--color-gold); }
.text-sage { color: var(--color-sage); }
.text-muted { color: var(--text-dark-muted); }
.theme-dark .text-muted, .theme-forest .text-muted { color: var(--text-light-muted); }

.font-italic { font-style: italic; }
.font-mono { font-family: var(--font-mono); }
.font-sans { font-family: var(--font-sans); }

.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.justify-center { justify-content: center; }
.gap-xs { gap: var(--space-xs); }
.gap-sm { gap: var(--space-sm); }
.gap-md { gap: var(--space-md); }
.gap-lg { gap: var(--space-lg); }
.gap-xl { gap: var(--space-xl); }

/* 7. Scroll Reveal Animation */
.v2-reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s var(--ease-spring), transform 0.7s var(--ease-spring);
  will-change: opacity, transform;
}

.v2-reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.v2-reveal-delay-1 { transition-delay: 100ms; }
.v2-reveal-delay-2 { transition-delay: 200ms; }
.v2-reveal-delay-3 { transition-delay: 300ms; }
.v2-reveal-delay-4 { transition-delay: 400ms; }

/* 8. Accessibility Focus States */
:focus-visible {
  outline: 2px solid var(--color-terracotta);
  outline-offset: 3px;
}

.skip-link {
  position: absolute;
  top: -100px;
  left: 20px;
  background: var(--color-obsidian);
  color: var(--text-light-primary);
  padding: 8px 16px;
  z-index: 10000;
  border-radius: var(--radius-sm);
  transition: top var(--duration-fast) ease;
}

.skip-link:focus {
  top: 20px;
}