/**
 * RSSDI-JHCON 2027 — PHASE 3 BASE ARCHITECTURE & ACCESSIBILITY
 * Modern reset, fluid typography, smooth scrolling, focus indicators,
 * and prefers-reduced-motion compliance.
 */

/* Modern CSS Reset & Layout Stability */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  scrollbar-gutter: stable;
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-body);
  background-color: var(--color-sage-bg);
  background-image: 
    radial-gradient(circle at 10% 20%, rgba(200, 224, 165, 0.35) 0%, transparent 40%),
    radial-gradient(circle at 90% 80%, rgba(239, 243, 221, 0.85) 0%, transparent 50%);
  color: var(--color-text-main);
  line-height: 1.6;
  min-height: 100dvh;
  overflow-x: hidden;
  position: relative;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Typography Defaults & Semantic Hierarchy */
h1, h2, h3, h4, h5, h6 {
  color: var(--color-forest);
  line-height: 1.15;
  font-weight: var(--weight-bold);
  letter-spacing: -0.01em;
}

p {
  margin-bottom: 1rem;
}

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

a {
  color: var(--color-forest);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

/* Image Stability & CLS Prevention */
img, svg {
  display: block;
  max-width: 100%;
  height: auto;
  image-rendering: -webkit-optimize-contrast;
}

button, input, select, textarea {
  font: inherit;
  color: inherit;
}

button {
  cursor: pointer;
  border: none;
  background: none;
  touch-action: manipulation;
}

/* High Contrast Accessible Focus Ring */
:focus-visible {
  outline: 3px solid var(--color-kelly);
  outline-offset: 3px;
  border-radius: var(--radius-square-xs);
}

/* Minimum Touch Target for Touch Accessibility (WCAG 2.5.5) */
button, a.btn, .filter-btn, .gallery-card {
  min-height: 44px;
}

/* Layout Containers */
.container {
  width: 100%;
  max-width: 1240px;
  margin-inline: auto;
  padding-inline: clamp(1rem, 3.5vw, 1.75rem);
}

.container-narrow {
  max-width: 960px;
}

.container-wide {
  max-width: 1380px;
}

.section-spacing {
  padding-block: clamp(3.5rem, 6vw, 6rem);
  position: relative;
}

/* Section Header Typography */
.section-header {
  text-align: center;
  max-width: 780px;
  margin-inline: auto;
  margin-bottom: clamp(2rem, 4vw, 3.5rem);
  position: relative;
  z-index: 2;
}

.section-header-left {
  text-align: left;
  margin-inline: 0;
}

.section-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  font-family: var(--font-display);
  font-size: var(--text-xs);
  font-weight: var(--weight-bold);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--color-kelly);
  background: rgba(76, 154, 42, 0.1);
  padding: 0.35rem 0.95rem;
  border-radius: var(--radius-full);
  margin-bottom: var(--space-sm);
  border: 1px solid rgba(76, 154, 42, 0.2);
}

.section-title {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: var(--weight-black);
  text-transform: uppercase;
  letter-spacing: 0.02em;
  color: var(--color-navy);
  margin-bottom: var(--space-xs);
  line-height: 1.08;
}

.section-subtitle {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  max-width: 640px;
  margin-inline: auto;
  line-height: 1.5;
}

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

/* ==========================================================================
   PREFERS-REDUCED-MOTION (Accessibility Compliance)
   ========================================================================== */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto !important;
  }
  
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
  
  .motif-block,
  .motif-float-slow,
  .motif-float-reverse,
  .animate-entrance,
  .reveal-on-scroll {
    animation: none !important;
    transform: none !important;
    opacity: 1 !important;
  }
}