/* ============================================
   BRIGHTPATH ASCEND GROUP - V4
   Base Styles - 2027 Enterprise
   ============================================ */

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-primary);
  font-size: var(--text-base);
  font-weight: var(--weight-regular);
  line-height: var(--leading-normal);
  color: var(--color-text-primary);
  background-color: var(--color-obsidian);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

/* Selection */
::selection {
  background-color: var(--color-accent);
  color: var(--color-white);
}

/* Typography - Authority */
h1, h2, h3, h4, h5, h6 {
  font-weight: var(--weight-medium);
  line-height: var(--leading-tight);
  color: var(--color-text-primary);
  letter-spacing: var(--tracking-tight);
}

.headline-hero {
  font-size: var(--text-hero);
  font-weight: var(--weight-thin);
  line-height: var(--leading-none);
  letter-spacing: var(--tracking-tighter);
}

.headline-section {
  font-size: clamp(2.5rem, 6vw, 5rem);
  font-weight: var(--weight-extralight);
  line-height: var(--leading-tight);
  letter-spacing: var(--tracking-tight);
}

.headline-statement {
  font-size: clamp(1.5rem, 3vw, 2.5rem);
  font-weight: var(--weight-light);
  line-height: var(--leading-snug);
}

.text-large {
  font-size: var(--text-xl);
  line-height: var(--leading-relaxed);
  color: var(--color-text-secondary);
}

.text-body {
  font-size: var(--text-base);
  line-height: var(--leading-relaxed);
  color: var(--color-text-secondary);
}

.text-small {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

.text-micro {
  font-size: var(--text-xs);
  font-weight: var(--weight-medium);
  text-transform: uppercase;
  letter-spacing: var(--tracking-widest);
  color: var(--color-text-muted);
}

/* Accent Text */
.text-accent {
  color: var(--color-accent);
}

/* Links */
a {
  color: var(--color-text-primary);
  text-decoration: none;
  transition: color var(--duration-fast) var(--ease-out-expo);
}

a:hover {
  color: var(--color-accent);
}

/* Emphasis */
strong {
  font-weight: var(--weight-semibold);
  color: var(--color-text-primary);
}

em {
  font-style: normal;
  color: var(--color-accent);
}

/* Layout */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-8);
}

@media (min-width: 768px) {
  .container {
    padding: 0 var(--space-16);
  }
}

.container-narrow {
  max-width: var(--container-narrow);
}

.container-text {
  max-width: var(--container-text);
}

/* Sections - Cinematic Spacing */
.section {
  padding: var(--space-32) 0;
}

.section-hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

.section-full {
  min-height: 100vh;
  display: flex;
  align-items: center;
}

.section-statement {
  padding: var(--space-48) 0;
}

@media (min-width: 768px) {
  .section {
    padding: var(--space-48) 0;
  }

  .section-statement {
    padding: var(--space-64) 0;
  }
}

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

.divider-accent {
  width: 60px;
  height: 1px;
  background: var(--color-accent);
}

/* Images */
img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* Lists */
ul, ol {
  list-style: none;
}

/* Visually Hidden */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Focus States - Refined */
:focus-visible {
  outline: 1px solid var(--color-accent);
  outline-offset: 4px;
}

/* Scroll Animations */
.reveal {
  opacity: 0;
  transform: translateY(40px);
  transition:
    opacity var(--duration-slow) var(--ease-out-expo),
    transform var(--duration-slow) var(--ease-out-expo);
}

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

.reveal-delay-1 { transition-delay: 100ms; }
.reveal-delay-2 { transition-delay: 200ms; }
.reveal-delay-3 { transition-delay: 300ms; }
.reveal-delay-4 { transition-delay: 400ms; }
.reveal-delay-5 { transition-delay: 500ms; }

/* Fade In Stagger */
.stagger > * {
  opacity: 0;
  transform: translateY(20px);
  transition:
    opacity var(--duration-base) var(--ease-out-expo),
    transform var(--duration-base) var(--ease-out-expo);
}

.stagger.visible > *:nth-child(1) { transition-delay: 0ms; opacity: 1; transform: translateY(0); }
.stagger.visible > *:nth-child(2) { transition-delay: 100ms; opacity: 1; transform: translateY(0); }
.stagger.visible > *:nth-child(3) { transition-delay: 200ms; opacity: 1; transform: translateY(0); }
.stagger.visible > *:nth-child(4) { transition-delay: 300ms; opacity: 1; transform: translateY(0); }
.stagger.visible > *:nth-child(5) { transition-delay: 400ms; opacity: 1; transform: translateY(0); }

/* Grain Overlay - Subtle Texture */
.grain::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  opacity: 0.015;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)'/%3E%3C/svg%3E");
  z-index: 99;
}

/* ============================================
   ACCESSIBILITY
   ============================================ */

/* Skip to Content */
.skip-link {
  position: absolute;
  top: -100%;
  left: 0;
  padding: var(--space-3) var(--space-6);
  background: var(--color-accent);
  color: var(--color-bg);
  font-weight: var(--weight-semibold);
  z-index: 10000;
  transition: top 0.2s;
}

.skip-link:focus {
  top: 0;
}

/* Focus Visible */
:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

:focus:not(:focus-visible) {
  outline: none;
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }

  .reveal {
    opacity: 1;
    transform: none;
  }

  .stagger > * {
    opacity: 1;
    transform: none;
  }
}