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

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--nav-height) + var(--spacing-4));
}

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

/* Skip Link for Accessibility */
.skip-link {
  position: absolute;
  top: -40px;
  left: 6px;
  background: var(--color-primary);
  color: var(--text-white);
  padding: var(--spacing-2) var(--spacing-4);
  text-decoration: none;
  border-radius: var(--radius-base);
  z-index: 1000;
  transition: var(--transition-fast);
}

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

/* Container */
.container {
  max-width: var(--container-xl);
  margin: 0 auto;
  padding: 0 var(--spacing-6);
}

@media (min-width: 640px) {
  .container {
    padding: 0 var(--spacing-8);
  }
}

@media (min-width: 1024px) {
  .container {
    padding: 0 var(--spacing-12);
  }
}

/* Section Styles */
.section {
  padding: var(--spacing-20) 0;
}

.section-header {
  text-align: center;
  margin-bottom: var(--spacing-16);
}

.section-subtitle {
  font-family: var(--font-primary);
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-medium);
  color: var(--color-primary);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: var(--spacing-4);
}

.section-title {
  font-family: var(--font-primary);
  font-size: var(--font-size-5xl);
  font-weight: var(--font-weight-semibold);
  color: black;
  line-height: var(--line-height-tight);
  letter-spacing: -0.03em;
  margin-bottom: var(--spacing-8);
  position: relative;
}

.section-title::after {
  content: '';
  display: block;
  width: 120px;
  height: 4px;
  background: var(--gradient-primary);
  margin: var(--spacing-10) auto;
  border-radius: var(--radius-sm);
}

.description {
  font-size: var(--font-size-lg);
  color: black;
  line-height: var(--line-height-relaxed);
  max-width: 60ch;
  margin: 0 auto var(--spacing-8);
}

.description.highlight {
  color: black;
  font-weight: var(--font-weight-semibold);
}

/* Button Styles */
.cta-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-5) var(--spacing-12);
  background: var(--gradient-primary);
  color: var(--text-white);
  font-family: var(--font-primary);
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  text-decoration: none;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-radius: var(--radius-full);
  border: none;
  cursor: pointer;
  transition: var(--transition-smooth);
  box-shadow: var(--shadow-lg);
  min-width: 250px;
  position: relative;
  overflow: hidden;
}

.cta-button::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
  transition: var(--transition-slow);
}

.cta-button:hover::before {
  left: 100%;
}

.cta-button:hover {
  transform: translateY(-2px) scale(1.02);
  box-shadow: var(--shadow-xl);
}

.cta-button:focus {
  outline: none;
  box-shadow: var(--shadow-xl), var(--focus-ring);
}

.cta-button:active {
  transform: translateY(-1px) scale(1.01);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-primary);
  font-weight: var(--font-weight-semibold);
  line-height: var(--line-height-tight);
  color: var(--text-primary);
  margin-bottom: var(--spacing-4);
}

h1 {
  font-size: var(--font-size-6xl);
  color: var(--text-primary);
}

h2 {
  font-size: var(--font-size-4xl);
  color: var(--text-primary);
}

h3 {
  font-size: var(--font-size-2xl);
  color: var(--text-primary);
}

h4 {
  font-size: var(--font-size-xl);
  color: var(--text-primary);
}

h5 {
  font-size: var(--font-size-lg);
  color: var(--text-primary);
}

h6 {
  font-size: var(--font-size-base);
  color: var(--text-primary);
}

p {
  margin-bottom: var(--spacing-4);
}

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

a:hover {
  color: var(--color-primary-dark);
}

a:focus {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* Lists */
ul, ol {
  margin-bottom: var(--spacing-4);
  padding-left: var(--spacing-6);
}

li {
  margin-bottom: var(--spacing-2);
}

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

/* Lazy Loading */
img[loading="lazy"] {
  opacity: 0;
  transition: opacity var(--transition-normal);
}

img[loading="lazy"].loaded {
  opacity: 1;
}

/* Utility Classes */
.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;
}

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

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

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

.font-primary {
  font-family: var(--font-primary);
}

.font-secondary {
  font-family: var(--font-secondary);
}

.animate-fade-in {
  animation: var(--animation-fade-in);
}

.animate-slide-in-up {
  animation: var(--animation-slide-in-up);
}

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

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

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

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

@keyframes scaleIn {
  from {
    opacity: 0;
    transform: scale(0.9);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

@keyframes bounceIn {
  0% {
    opacity: 0;
    transform: scale(0.3);
  }
  50% {
    opacity: 1;
    transform: scale(1.05);
  }
  70% {
    transform: scale(0.9);
  }
  100% {
    opacity: 1;
    transform: scale(1);
  }
}

/* Scrollbar Styling */
::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: var(--bg-light);
}

::-webkit-scrollbar-thumb {
  background: var(--color-primary);
  border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-primary-dark);
}

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

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

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