/* Main Stylesheet */
:root {
  /* Color System */
  --color-primary-100: #e0f2ff;
  --color-primary-200: #b8e0ff;
  --color-primary-300: #8ac9ff;
  --color-primary-400: #5aadff;
  --color-primary-500: #2b90ff;
  --color-primary-600: #0073e6;
  --color-primary-700: #0059b3;
  --color-primary-800: #004080;
  --color-primary-900: #002a52;

  --color-secondary-100: #e6f7f5;
  --color-secondary-200: #c0eae5;
  --color-secondary-300: #9bddd5;
  --color-secondary-400: #75cfc5;
  --color-secondary-500: #50c2b5;
  --color-secondary-600: #35a091;
  --color-secondary-700: #277a6e;
  --color-secondary-800: #1a544a;
  --color-secondary-900: #0d2e2a;

  --color-accent-100: #fff0e0;
  --color-accent-200: #ffe0c0;
  --color-accent-300: #ffd0a0;
  --color-accent-400: #ffc080;
  --color-accent-500: #ffb060;
  --color-accent-600: #ff9020;
  --color-accent-700: #e67000;
  --color-accent-800: #b35500;
  --color-accent-900: #803d00;

  --color-success-500: #4caf50;
  --color-warning-500: #ff9800;
  --color-error-500: #f44336;

  --color-gray-100: #f8f9fa;
  --color-gray-200: #e9ecef;
  --color-gray-300: #dee2e6;
  --color-gray-400: #ced4da;
  --color-gray-500: #adb5bd;
  --color-gray-600: #6c757d;
  --color-gray-700: #495057;
  --color-gray-800: #343a40;
  --color-gray-900: #212529;

  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
  --line-height-body: 1.5;
  --line-height-heading: 1.2;

  /* Spacing System (8px) */
  --space-1: 0.25rem;   /* 4px */
  --space-2: 0.5rem;    /* 8px */
  --space-3: 1rem;      /* 16px */
  --space-4: 1.5rem;    /* 24px */
  --space-5: 2rem;      /* 32px */
  --space-6: 3rem;      /* 48px */
  --space-7: 4rem;      /* 64px */
  --space-8: 5rem;      /* 80px */

  /* Container Width */
  --container-width: 1200px;
  --container-padding: var(--space-4);

  /* Breakpoints */
  --breakpoint-sm: 576px;
  --breakpoint-md: 768px;
  --breakpoint-lg: 992px;
  --breakpoint-xl: 1200px;

  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-medium: 0.25s ease;
  --transition-slow: 0.5s ease;

  /* Box Shadows */
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.12), 0 1px 2px rgba(0, 0, 0, 0.24);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1), 0 1px 3px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 10px 20px rgba(0, 0, 0, 0.1), 0 3px 6px rgba(0, 0, 0, 0.05);
  
  /* Border Radius */
  --border-radius-sm: 4px;
  --border-radius-md: 8px;
  --border-radius-lg: 16px;
}

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

html, body {
  height: 100%;
}

body {
  font-family: var(--font-family);
  font-size: 16px;
  line-height: var(--line-height-body);
  color: var(--color-gray-800);
  background-color: #ffffff;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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

a {
  color: var(--color-primary-600);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-primary-700);
}

ul, ol {
  list-style: none;
}

button, input, select, textarea {
  font-family: inherit;
  font-size: inherit;
  line-height: inherit;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  margin-bottom: var(--space-3);
  line-height: var(--line-height-heading);
  font-weight: 700;
  color: var(--color-gray-900);
}

h1 {
  font-size: 2.5rem;
}

h2 {
  font-size: 2rem;
}

h3 {
  font-size: 1.5rem;
}

h4 {
  font-size: 1.25rem;
}

h5 {
  font-size: 1.125rem;
}

h6 {
  font-size: 1rem;
}

p {
  margin-bottom: var(--space-3);
}

/* Container */
.container {
  width: 100%;
  max-width: var(--container-width);
  padding-left: var(--container-padding);
  padding-right: var(--container-padding);
  margin-left: auto;
  margin-right: auto;
}

/* Buttons */
.btn {
  display: inline-block;
  padding: var(--space-2) var(--space-4);
  font-weight: 500;
  text-align: center;
  text-decoration: none;
  border-radius: var(--border-radius-md);
  transition: all var(--transition-fast);
  cursor: pointer;
  border: none;
  line-height: 1.5;
}

.btn-primary {
  background-color: var(--color-primary-600);
  color: white;
}

.btn-primary:hover {
  background-color: var(--color-primary-700);
  color: white;
}

.btn-secondary {
  background-color: var(--color-secondary-600);
  color: white;
}

.btn-secondary:hover {
  background-color: var(--color-secondary-700);
  color: white;
}

.btn-accent {
  background-color: var(--color-accent-600);
  color: white;
}

.btn-accent:hover {
  background-color: var(--color-accent-700);
  color: white;
}

.btn-outline {
  background-color: transparent;
  color: var(--color-primary-600);
  border: 2px solid var(--color-primary-600);
}

.btn-outline:hover {
  background-color: var(--color-primary-600);
  color: white;
}

/* Header Styles */
#site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  background-color: rgba(255, 255, 255, 0.95);
  box-shadow: var(--shadow-sm);
  z-index: 1000;
  transition: background-color var(--transition-medium);
  padding: var(--space-2) 0;
}

#site-header.scrolled {
  background-color: rgba(255, 255, 255, 0.98);
  box-shadow: var(--shadow-md);
}

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

.logo a {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-primary-700);
  text-decoration: none;
}

.main-nav {
  display: flex;
  align-items: center;
}

.nav-menu {
  display: flex;
  gap: var(--space-4);
}

.nav-menu a {
  color: var(--color-gray-700);
  font-weight: 500;
  text-decoration: none;
  padding: var(--space-1) 0;
  position: relative;
}

.nav-menu a:after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--color-primary-600);
  transition: width var(--transition-medium);
}

.nav-menu a:hover:after,
.nav-menu a.active:after {
  width: 100%;
}

.nav-menu a:hover,
.nav-menu a.active {
  color: var(--color-primary-600);
}

.mobile-menu-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-1);
  margin-left: var(--space-2);
}

.mobile-menu-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--color-gray-800);
  margin: 6px 0;
  transition: all var(--transition-fast);
}

/* Footer Styles */
#site-footer {
  background-color: var(--color-gray-800);
  color: var(--color-gray-300);
  padding: var(--space-6) 0 var(--space-3);
  margin-top: var(--space-6);
}

.footer-content {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: var(--space-4);
}

.footer-logo {
  flex: 1;
  min-width: 250px;
}

.footer-logo a {
  font-size: 1.5rem;
  font-weight: 700;
  color: white;
  margin-bottom: var(--space-2);
  display: inline-block;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-5);
}

.footer-nav h4 {
  color: white;
  margin-bottom: var(--space-3);
  font-size: 1.1rem;
}

.footer-nav ul {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.footer-nav a {
  color: var(--color-gray-400);
  transition: color var(--transition-fast);
}

.footer-nav a:hover {
  color: white;
}

.footer-bottom {
  margin-top: var(--space-5);
  padding-top: var(--space-3);
  border-top: 1px solid var(--color-gray-700);
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: var(--space-3);
}

.footer-bottom p {
  margin-bottom: 0;
}

.footer-bottom a {
  color: var(--color-gray-300);
}

.footer-bottom a:hover {
  color: white;
}

/* Responsive Styles */
@media (max-width: 991px) {
  h1 {
    font-size: 2.25rem;
  }
  
  h2 {
    font-size: 1.75rem;
  }
  
  h3 {
    font-size: 1.375rem;
  }
}

@media (max-width: 767px) {
  .mobile-menu-toggle {
    display: block;
  }
  
  .nav-menu {
    position: fixed;
    top: 60px;
    right: -100%;
    flex-direction: column;
    background-color: white;
    width: 70%;
    height: calc(100vh - 60px);
    padding: var(--space-4);
    box-shadow: var(--shadow-lg);
    transition: right var(--transition-medium);
    z-index: 1000;
  }
  
  .nav-menu.active {
    right: 0;
  }
  
  .footer-content {
    flex-direction: column;
    gap: var(--space-5);
  }
  
  .footer-links {
    width: 100%;
    justify-content: space-between;
  }
  
  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }
}

@media (max-width: 575px) {
  h1 {
    font-size: 2rem;
  }
  
  h2 {
    font-size: 1.5rem;
  }
  
  h3 {
    font-size: 1.25rem;
  }
  
  .footer-links {
    flex-direction: column;
    gap: var(--space-4);
  }
}

/* Helper Classes */
.text-center {
  text-align: center;
}

.mb-0 {
  margin-bottom: 0;
}

.mb-1 {
  margin-bottom: var(--space-1);
}

.mb-2 {
  margin-bottom: var(--space-2);
}

.mb-3 {
  margin-bottom: var(--space-3);
}

.mb-4 {
  margin-bottom: var(--space-4);
}

.mb-5 {
  margin-bottom: var(--space-5);
}

.mt-5 {
  margin-top: var(--space-5);
}

.py-5 {
  padding-top: var(--space-5);
  padding-bottom: var(--space-5);
}

.py-6 {
  padding-top: var(--space-6);
  padding-bottom: var(--space-6);
}

.center-button {
  display: flex;
  justify-content: center;
  margin-top: var(--space-4);
}