/* ============================================
   MAIN STYLESHEET
   ============================================
   Base styles, resets, and global utilities.

   Import order:
   1. Variables (design tokens)
   2. Main (this file - reset & base)
   3. Sections (specific components)
   4. Responsive (media queries)
   ============================================ */

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

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

html {
  /* Enable smooth scrolling for anchor links */
  scroll-behavior: smooth;
  /* Improve font rendering */
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: var(--leading-normal);
  color: var(--text-primary);
  background-color: var(--background);
  overflow-x: hidden;
}

/* ========== TYPOGRAPHY ========== */

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: var(--font-bold);
  line-height: var(--leading-tight);
  color: var(--text-primary);
  margin-bottom: var(--spacing-md);
}

h1 {
  font-size: var(--text-5xl);
}

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

h3 {
  font-size: var(--text-3xl);
}

h4 {
  font-size: var(--text-2xl);
}

h5 {
  font-size: var(--text-xl);
}

h6 {
  font-size: var(--text-lg);
}

p {
  margin-bottom: var(--spacing-md);
  color: var(--text-secondary);
}

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

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

/* ========== LAYOUT UTILITIES ========== */

.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

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

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

.section {
  padding: var(--spacing-5xl) 0;
}

.section-alt {
  background-color: var(--background-alt);
}

/* ========== BUTTONS ========== */

.btn {
  display: inline-block;
  padding: 0.875rem 2rem;
  font-family: var(--font-heading);
  font-size: var(--text-base);
  font-weight: var(--font-semibold);
  text-align: center;
  border-radius: var(--radius-lg);
  border: none;
  cursor: pointer;
  transition: all var(--transition-base);
  text-decoration: none;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary-green), var(--primary-blue));
  color: white;
  box-shadow: var(--shadow-md);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-xl);
  color: white;
}

.btn-secondary {
  background-color: transparent;
  color: var(--text-primary);
  border: 2px solid var(--border);
}

.btn-secondary:hover {
  border-color: var(--primary-green);
  color: var(--primary-green);
  background-color: var(--primary-green-light);
}

.btn-outline {
  background-color: transparent;
  color: var(--primary-green);
  border: 2px solid var(--primary-green);
}

.btn-outline:hover {
  background-color: var(--primary-green);
  color: white;
}

/* ========== CARDS ========== */

.card {
  background-color: var(--background);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
  box-shadow: var(--shadow-md);
  transition: all var(--transition-base);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
}

/* ========== BADGES ========== */

.badge {
  display: inline-block;
  padding: 0.375rem 0.75rem;
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  border-radius: var(--radius-full);
  background-color: var(--primary-green-light);
  color: var(--primary-green-dark);
}

.badge-blue {
  background-color: var(--primary-blue-light);
  color: var(--primary-blue-dark);
}

.badge-gray {
  background-color: var(--gray-100);
  color: var(--gray-700);
}

/* ========== GRID UTILITIES ========== */

.grid {
  display: grid;
  gap: var(--spacing-xl);
}

.grid-2 {
  grid-template-columns: repeat(2, 1fr);
}

.grid-3 {
  grid-template-columns: repeat(3, 1fr);
}

.grid-4 {
  grid-template-columns: repeat(4, 1fr);
}

/* ========== FLEXBOX UTILITIES ========== */

.flex {
  display: flex;
}

.flex-center {
  display: flex;
  align-items: center;
  justify-content: center;
}

.flex-between {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.flex-col {
  display: flex;
  flex-direction: column;
}

.gap-sm { gap: var(--spacing-sm); }
.gap-md { gap: var(--spacing-md); }
.gap-lg { gap: var(--spacing-lg); }
.gap-xl { gap: var(--spacing-xl); }

/* ========== TEXT UTILITIES ========== */

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

.text-gradient {
  background: linear-gradient(135deg, var(--primary-green), var(--primary-blue));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.text-primary {
  color: var(--text-primary);
}

.text-secondary {
  color: var(--text-secondary);
}

.text-muted {
  color: var(--text-muted);
}

/* ========== SECTION HEADINGS ========== */

.section-heading {
  text-align: center;
  margin-bottom: var(--spacing-4xl);
}

.section-title {
  font-size: var(--text-4xl);
  margin-bottom: var(--spacing-md);
}

.section-subtitle {
  font-size: var(--text-lg);
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto;
}

/* ========== ANIMATIONS ========== */

/* Fade in animation */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.fade-in {
  animation: fadeIn 0.6s ease-out;
}

/* Gradient animation for hero */
@keyframes gradientShift {
  0% {
    background-position: 0% 50%;
  }
  50% {
    background-position: 100% 50%;
  }
  100% {
    background-position: 0% 50%;
  }
}

/* ========== SCROLL INDICATOR ========== */

.scroll-indicator {
  position: absolute;
  bottom: var(--spacing-xl);
  left: 50%;
  transform: translateX(-50%);
  animation: bounce 2s infinite;
}

@keyframes bounce {
  0%, 20%, 50%, 80%, 100% {
    transform: translateX(-50%) translateY(0);
  }
  40% {
    transform: translateX(-50%) translateY(-10px);
  }
  60% {
    transform: translateX(-50%) translateY(-5px);
  }
}

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

/* Skip to main content link */
.skip-to-main {
  position: absolute;
  top: -100px;
  left: 0;
  background: var(--primary-green);
  color: white;
  padding: var(--spacing-md);
  z-index: 1000;
  text-decoration: none;
}

.skip-to-main:focus {
  top: 0;
}

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

/* ========== LOADING STATES ========== */

.loading {
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 3px solid var(--gray-200);
  border-radius: 50%;
  border-top-color: var(--primary-green);
  animation: spin 1s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

/* ========== IMAGE STYLES ========== */

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

/* ========== SELECTION STYLING ========== */

::selection {
  background-color: var(--primary-green-light);
  color: var(--primary-green-dark);
}