/* ===================================
   BASE STYLES & RESET
   ================================== */

/* ===== RESET ===== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

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

/* ===== BASE STYLES ===== */
html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-primary);
  line-height: 1.6;
  color: var(--white);
  background: var(--black);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ===== TYPOGRAPHY ===== */
h1, h2, h3, h4, h5, h6 {
  font-weight: var(--font-weight-light);
  line-height: 1.2;
}

h1 {
  font-size: var(--font-size-5xl);
  margin-bottom: var(--space-sm);
}

h2 {
  font-size: var(--font-size-4xl);
  margin-bottom: var(--space-sm);
}

h3 {
  font-size: var(--font-size-3xl);
  margin-bottom: var(--space-sm);
}

h4 {
  font-size: var(--font-size-xl);
  margin-bottom: var(--space-xs);
}

p {
  margin-bottom: var(--space-sm);
  font-size: var(--font-size-base);
}

a {
  color: inherit;
  text-decoration: none;
  transition: var(--transition-medium);
}

ul, ol {
  list-style: none;
}

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

iframe {
  border: none;
}

/* ===== LAYOUT UTILITIES ===== */
.container {
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 var(--container-padding);
}

.section {
  padding: var(--space-3xl) 0;
  position: relative;
}

.section-header {
  text-align: center;
  margin-bottom: var(--space-2xl);
}

.section-header h2 {
  color: var(--white);
  font-weight: var(--font-weight-light);
}

.section-header p {
  font-size: var(--font-size-xl);
  color: var(--medium-gray);
  max-width: 600px;
  margin: 0 auto;
  opacity: 0.9;
}

/* ===== UTILITY CLASSES ===== */
.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;
}

.text-center {
  text-align: center;
}

.text-left {
  text-align: left;
}

.text-right {
  text-align: right;
}

.hidden {
  display: none;
}

.visible {
  display: block;
}

/* ===== ANIMATIONS ===== */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

@keyframes slideInLeft {
  from {
    opacity: 0;
    transform: translateX(-30px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes slideInRight {
  from {
    opacity: 0;
    transform: translateX(30px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes pulse {
  0%, 100% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.05);
  }
}

@keyframes float {
  0%, 100% {
    transform: translateY(0px);
  }
  50% {
    transform: translateY(-10px);
  }
}

@keyframes glow {
  0%, 100% {
    box-shadow: 0 0 5px var(--primary-color);
  }
  50% {
    box-shadow: 0 0 20px var(--primary-color), 0 0 30px var(--primary-color);
  }
}

@keyframes shimmer {
  0% {
    background-position: -200px 0;
  }
  100% {
    background-position: calc(200px + 100%) 0;
  }
}

/* ===== FOCUS STYLES ===== */
:focus {
  outline: 2px solid var(--primary-color);
  outline-offset: 2px;
}

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

:focus-visible {
  outline: 2px solid var(--primary-color);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

/* ===== SELECTION STYLES ===== */
::selection {
  background-color: var(--primary-color);
  color: var(--black);
}

::-moz-selection {
  background-color: var(--primary-color);
  color: var(--black);
}

/* ===== SCROLLBAR STYLES ===== */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--dark-gray);
  border-radius: var(--radius-sm);
}

::-webkit-scrollbar-thumb {
  background: linear-gradient(45deg, var(--primary-color), var(--primary-hover));
  border-radius: var(--radius-full);
  border: 1px solid var(--dark-gray);
}

::-webkit-scrollbar-thumb:hover {
  background: linear-gradient(45deg, var(--primary-hover), var(--primary-dark));
  box-shadow: 0 0 8px var(--primary-color);
}

::-webkit-scrollbar-corner {
  background: var(--dark-gray);
}

/* ===== PLACEHOLDER STYLES ===== */
::placeholder {
  color: var(--light-gray);
  opacity: 0.7;
}

::-webkit-input-placeholder {
  color: var(--light-gray);
  opacity: 0.7;
}

::-moz-placeholder {
  color: var(--light-gray);
  opacity: 0.7;
}

:-ms-input-placeholder {
  color: var(--light-gray);
  opacity: 0.7;
}

/* ===== LOADING STATES ===== */
.loading-skeleton {
  background: linear-gradient(90deg, 
    var(--dark-gray) 25%, 
    var(--medium-gray) 50%, 
    var(--dark-gray) 75%
  );
  background-size: 200px 100%;
  animation: shimmer 2s infinite;
  border-radius: var(--radius-md);
}

.loading-spinner {
  width: 40px;
  height: 40px;
  border: 4px solid var(--dark-gray);
  border-top: 4px solid var(--primary-color);
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin: var(--space-lg) auto;
}

@keyframes spin {
  0% { 
    transform: rotate(0deg); 
  }
  100% { 
    transform: rotate(360deg); 
  }
}

/* ===== ACCESSIBILITY HELPERS ===== */
.visually-hidden {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  padding: 0 !important;
  margin: -1px !important;
  overflow: hidden !important;
  clip: rect(0, 0, 0, 0) !important;
  white-space: nowrap !important;
  border: 0 !important;
}

.skip-link {
  position: absolute;
  top: -40px;
  left: 6px;
  background: var(--primary-color);
  color: var(--black);
  padding: 8px;
  text-decoration: none;
  border-radius: var(--radius-sm);
  z-index: 1000;
  font-weight: var(--font-weight-bold);
}

.skip-link:focus {
  top: 6px;
}

/* ===== PRINT OPTIMIZATION ===== */
@media print {
  * {
    background: transparent !important;
    color: black !important;
    box-shadow: none !important;
    text-shadow: none !important;
  }
  
  body {
    font-size: 12pt;
    line-height: 1.4;
  }
  
  h1, h2, h3 {
    page-break-after: avoid;
  }
  
  img {
    max-width: 100% !important;
  }
  
  @page {
    margin: 0.5in;
  }
}

/* ===== HIGH CONTRAST MODE ===== */
@media (prefers-contrast: high) {
  :root {
    --primary-color: #00FF00;
    --secondary-color: #FF0000;
    --white: #FFFFFF;
    --black: #000000;
    --overlay-card: rgba(255, 255, 255, 0.3);
  }
}

/* ===== 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;
  }
  
  .loading-skeleton {
    animation: none;
    background: var(--dark-gray);
  }
  
  .loading-spinner {
    animation: none;
    border: 4px solid var(--primary-color);
  }
}

/* ===== DARK MODE SUPPORT ===== */
@media (prefers-color-scheme: light) {
  :root {
    --background-primary: var(--white);
    --text-primary: var(--black);
    --overlay-card: rgba(0, 0, 0, 0.05);
  }
}

/* ===== CONTAINER QUERIES (Future-proofing) ===== */
@container (min-width: 768px) {
  .responsive-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@container (min-width: 1024px) {
  .responsive-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}