/* Modern Blue & White CSS Stylesheet */
/* Clean, Simple, Soft Visuals - Responsive Design */

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

:root {
  /* Blue and White Color Palette */
  --primary-blue: #2563eb;
  --light-blue: #3b82f6;
  --soft-blue: #60a5fa;
  --pale-blue: #dbeafe;
  --very-pale-blue: #eff6ff;
  --white: #ffffff;
  --off-white: #f8fafc;
  --light-gray: #f1f5f9;
  --text-dark: #1e293b;
  --text-medium: #475569;
  --text-light: #64748b;
  
  /* Spacing Scale */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  
  /* Typography Scale */
  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 1.875rem;
  --text-4xl: 2.25rem;
  --text-5xl: 3rem;
  
  /* Border Radius */
  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  
  /* Transitions */
  --transition-fast: 150ms ease-in-out;
  --transition-normal: 300ms ease-in-out;
  --transition-slow: 500ms ease-in-out;
}

/* Base Typography */
html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  line-height: 1.6;
  color: var(--text-dark);
  background-color: var(--white);
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Headings */
h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: 1.2;
  margin-bottom: var(--space-md);
  color: var(--text-dark);
}

h1 {
  font-size: var(--text-4xl);
  font-weight: 700;
  background: linear-gradient(135deg, var(--primary-blue), var(--light-blue));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

h2 {
  font-size: var(--text-3xl);
  color: var(--primary-blue);
}

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

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

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

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

/* Paragraphs and Text */
p {
  margin-bottom: var(--space-md);
  color: var(--text-medium);
  max-width: 65ch;
}

.lead {
  font-size: var(--text-lg);
  color: var(--text-medium);
  font-weight: 300;
}

.small {
  font-size: var(--text-sm);
  color: var(--text-light);
}

/* Links */
a {
  color: var(--primary-blue);
  text-decoration: none;
  transition: all var(--transition-fast);
  position: relative;
}

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

a:focus {
  outline: 2px solid var(--soft-blue);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

/* Modern link underline effect */
.link-underline {
  position: relative;
}

.link-underline::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--primary-blue), var(--soft-blue));
  transition: width var(--transition-normal);
}

.link-underline:hover::after {
  width: 100%;
}

/* Container and Layout */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-md);
}

.container-sm {
  max-width: 768px;
  margin: 0 auto;
  padding: 0 var(--space-md);
}

.container-lg {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 var(--space-md);
}

/* Modern Grid System (No Tables) */
.grid {
  display: grid;
  gap: var(--space-lg);
}

.grid-cols-1 { grid-template-columns: 1fr; }
.grid-cols-2 { grid-template-columns: repeat(2, 1fr); }
.grid-cols-3 { grid-template-columns: repeat(3, 1fr); }
.grid-cols-4 { grid-template-columns: repeat(4, 1fr); }
.grid-cols-6 { grid-template-columns: repeat(6, 1fr); }
.grid-cols-12 { grid-template-columns: repeat(12, 1fr); }

/* Flexbox Utilities */
.flex {
  display: flex;
}

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

.flex-wrap {
  flex-wrap: wrap;
}

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

.items-start {
  align-items: flex-start;
}

.items-end {
  align-items: flex-end;
}

.justify-center {
  justify-content: center;
}

.justify-between {
  justify-content: space-between;
}

.justify-around {
  justify-content: space-around;
}

.justify-start {
  justify-content: flex-start;
}

.justify-end {
  justify-content: flex-end;
}

/* Spacing Utilities */
.gap-xs { gap: var(--space-xs); }
.gap-sm { gap: var(--space-sm); }
.gap-md { gap: var(--space-md); }
.gap-lg { gap: var(--space-lg); }
.gap-xl { gap: var(--space-xl); }
.gap-2xl { gap: var(--space-2xl); }

.m-0 { margin: 0; }
.m-auto { margin: auto; }
.mt-auto { margin-top: auto; }
.mb-auto { margin-bottom: auto; }

.p-xs { padding: var(--space-xs); }
.p-sm { padding: var(--space-sm); }
.p-md { padding: var(--space-md); }
.p-lg { padding: var(--space-lg); }
.p-xl { padding: var(--space-xl); }
.p-2xl { padding: var(--space-2xl); }

.py-xs { padding-top: var(--space-xs); padding-bottom: var(--space-xs); }
.py-sm { padding-top: var(--space-sm); padding-bottom: var(--space-sm); }
.py-md { padding-top: var(--space-md); padding-bottom: var(--space-md); }
.py-lg { padding-top: var(--space-lg); padding-bottom: var(--space-lg); }
.py-xl { padding-top: var(--space-xl); padding-bottom: var(--space-xl); }

.px-xs { padding-left: var(--space-xs); padding-right: var(--space-xs); }
.px-sm { padding-left: var(--space-sm); padding-right: var(--space-sm); }
.px-md { padding-left: var(--space-md); padding-right: var(--space-md); }
.px-lg { padding-left: var(--space-lg); padding-right: var(--space-lg); }
.px-xl { padding-left: var(--space-xl); padding-right: var(--space-xl); }

/* Cards and Surfaces */
.card {
  background: var(--white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  padding: var(--space-xl);
  transition: all var(--transition-normal);
  border: 1px solid var(--light-gray);
}

.card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

.card-soft {
  background: var(--very-pale-blue);
  border: 1px solid var(--pale-blue);
}

.card-blue {
  background: linear-gradient(135deg, var(--primary-blue), var(--light-blue));
  color: var(--white);
  border: none;
}

.card-blue h1, .card-blue h2, .card-blue h3, .card-blue h4, .card-blue h5, .card-blue h6 {
  color: var(--white);
}

.card-blue p {
  color: rgba(255, 255, 255, 0.9);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-lg);
  border: none;
  border-radius: var(--radius-md);
  font-size: var(--text-base);
  font-weight: 500;
  text-decoration: none;
  cursor: pointer;
  transition: all var(--transition-fast);
  position: relative;
  overflow: hidden;
}

.btn:focus {
  outline: 2px solid var(--soft-blue);
  outline-offset: 2px;
}

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

.btn-primary:hover {
  background: linear-gradient(135deg, var(--light-blue), var(--soft-blue));
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}

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

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

.btn-soft {
  background: var(--pale-blue);
  color: var(--primary-blue);
}

.btn-soft:hover {
  background: var(--soft-blue);
  color: var(--white);
}

.btn-lg {
  padding: var(--space-md) var(--space-2xl);
  font-size: var(--text-lg);
}

.btn-sm {
  padding: var(--space-xs) var(--space-md);
  font-size: var(--text-sm);
}

/* Form Elements */
.form-group {
  margin-bottom: var(--space-lg);
}

.form-label {
  display: block;
  margin-bottom: var(--space-sm);
  font-weight: 500;
  color: var(--text-dark);
}

.form-input {
  width: 100%;
  padding: var(--space-md);
  border: 2px solid var(--light-gray);
  border-radius: var(--radius-md);
  font-size: var(--text-base);
  transition: all var(--transition-fast);
  background: var(--white);
}

.form-input:focus {
  outline: none;
  border-color: var(--primary-blue);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-input::placeholder {
  color: var(--text-light);
}

.form-textarea {
  resize: vertical;
  min-height: 120px;
}

.form-select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 20 20'%3e%3cpath stroke='%236b7280' stroke-linecap='round' stroke-linejoin='round' stroke-width='1.5' d='m6 8 4 4 4-4'/%3e%3c/svg%3e");
  background-position: right 0.5rem center;
  background-repeat: no-repeat;
  background-size: 1.5em 1.5em;
  padding-right: 2.5rem;
}

/* Navigation */
.nav {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
  padding: var(--space-lg) 0;
}

.nav-link {
  color: var(--text-medium);
  font-weight: 500;
  transition: all var(--transition-fast);
  position: relative;
}

.nav-link:hover {
  color: var(--primary-blue);
}

.nav-link.active {
  color: var(--primary-blue);
}

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: -8px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--primary-blue);
  border-radius: 1px;
}

/* Header Styles */
.header {
  background: var(--white);
  border-bottom: 1px solid var(--light-gray);
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(10px);
  background: rgba(255, 255, 255, 0.95);
}

.header-blue {
  background: linear-gradient(135deg, var(--primary-blue), var(--light-blue));
  color: var(--white);
  border: none;
}

.header-blue .nav-link {
  color: rgba(255, 255, 255, 0.8);
}

.header-blue .nav-link:hover,
.header-blue .nav-link.active {
  color: var(--white);
}

/* Hero Section */
.hero {
  padding: var(--space-3xl) 0;
  text-align: center;
  background: linear-gradient(135deg, var(--very-pale-blue), var(--white));
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: radial-gradient(circle at 30% 20%, rgba(37, 99, 235, 0.1) 0%, transparent 50%),
              radial-gradient(circle at 70% 80%, rgba(59, 130, 246, 0.1) 0%, transparent 50%);
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 1;
}

/* Section Styles */
.section {
  padding: var(--space-3xl) 0;
}

.section-blue {
  background: linear-gradient(135deg, var(--primary-blue), var(--light-blue));
  color: var(--white);
}

.section-blue h1, .section-blue h2, .section-blue h3, .section-blue h4, .section-blue h5, .section-blue h6 {
  color: var(--white);
}

.section-blue p {
  color: rgba(255, 255, 255, 0.9);
}

.section-soft {
  background: var(--very-pale-blue);
}

/* Utilities */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.text-primary { color: var(--primary-blue); }
.text-white { color: var(--white); }
.text-gray { color: var(--text-medium); }

.bg-white { background-color: var(--white); }
.bg-blue { background: linear-gradient(135deg, var(--primary-blue), var(--light-blue)); }
.bg-soft { background-color: var(--very-pale-blue); }

.rounded { border-radius: var(--radius-md); }
.rounded-lg { border-radius: var(--radius-lg); }
.rounded-xl { border-radius: var(--radius-xl); }
.rounded-full { border-radius: 9999px; }

.shadow { box-shadow: var(--shadow-md); }
.shadow-lg { box-shadow: var(--shadow-lg); }
.shadow-xl { box-shadow: var(--shadow-xl); }

.w-full { width: 100%; }
.h-full { height: 100%; }

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

@keyframes slideIn {
  from { opacity: 0; transform: translateX(-20px); }
  to { opacity: 1; transform: translateX(0); }
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.7; }
}

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

.animate-slide-in {
  animation: slideIn 0.6s ease-out;
}

.animate-pulse {
  animation: pulse 2s infinite;
}

/* Responsive Design - Mobile First */
@media (max-width: 640px) {
  :root {
    --text-4xl: 2rem;
    --text-3xl: 1.5rem;
    --text-2xl: 1.25rem;
  }
  
  .container {
    padding: 0 var(--space-sm);
  }
  
  .grid-cols-2,
  .grid-cols-3,
  .grid-cols-4,
  .grid-cols-6,
  .grid-cols-12 {
    grid-template-columns: 1fr;
  }
  
  .hero {
    padding: var(--space-2xl) 0;
  }
  
  .section {
    padding: var(--space-2xl) 0;
  }
  
  .card {
    padding: var(--space-lg);
  }
  
  .nav {
    flex-direction: column;
    gap: var(--space-md);
  }
  
  .btn {
    width: 100%;
    justify-content: center;
  }
  
  .btn-sm {
    width: auto;
  }
}

@media (min-width: 641px) and (max-width: 768px) {
  .grid-cols-3,
  .grid-cols-4,
  .grid-cols-6,
  .grid-cols-12 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 769px) and (max-width: 1024px) {
  .grid-cols-4,
  .grid-cols-6,
  .grid-cols-12 {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* Print Styles */
@media print {
  .header,
  .nav,
  .btn {
    display: none;
  }
  
  .card {
    box-shadow: none;
    border: 1px solid var(--light-gray);
  }
  
  body {
    font-size: 12pt;
    line-height: 1.4;
  }
}

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

/* Focus styles for keyboard navigation */
.btn:focus-visible,
.form-input:focus-visible,
.nav-link:focus-visible {
  outline: 2px solid var(--primary-blue);
  outline-offset: 2px;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
  :root {
    --primary-blue: #0000ff;
    --text-dark: #000000;
    --text-medium: #000000;
  }
  
  .card {
    border: 2px solid var(--text-dark);
  }
}

/* Dark mode support (optional) */
@media (prefers-color-scheme: dark) {
  :root {
    --white: #1e293b;
    --off-white: #334155;
    --light-gray: #475569;
    --text-dark: #f8fafc;
    --text-medium: #e2e8f0;
    --text-light: #cbd5e1;
  }
  
  .card {
    background: var(--off-white);
    border-color: var(--light-gray);
  }
  
  .form-input {
    background: var(--off-white);
    border-color: var(--light-gray);
    color: var(--text-dark);
  }
}