/* Nullbase Design System - 2025 */

:root {
  /* Brand Colors */
  --color-primary: #5D8EDC;
  --color-accent: #FF6B6B;
  --color-secondary: #A1C181;
  --color-background: #F5F8FB;
  --color-text: #1F2D3D;
  
  /* Color Variations */
  --color-primary-hover: #4A7BC8;
  --color-accent-hover: #FF5252;
  --color-secondary-hover: #8FB06D;
  --color-text-muted: rgba(31, 45, 61, 0.6);
  
  /* Spacing */
  --spacing-xs: 8px;
  --spacing-sm: 16px;
  --spacing-md: 24px;
  --spacing-lg: 32px;
  --spacing-xl: 48px;
  --spacing-2xl: 64px;
  
  /* Borders */
  --border-radius: 12px;
  --border-radius-sm: 8px;
  --border-radius-lg: 16px;
  --border-radius-xl: 20px;
  
  /* Shadows */
  --shadow-light: 0 2px 4px rgba(31, 45, 61, 0.1);
  --shadow-medium: 0 4px 12px rgba(31, 45, 61, 0.15);
  --shadow-heavy: 0 8px 32px rgba(31, 45, 61, 0.2);
  --shadow-glass: 0 8px 32px rgba(93, 142, 220, 0.15);
  
  /* Liquid Glass Effects */
  --glass-background: rgba(255, 255, 255, 0.25);
  --glass-border: rgba(255, 255, 255, 0.18);
  --glass-blur: blur(10px);
  --frosted-background: rgba(245, 248, 251, 0.8);
  --frosted-blur: blur(20px) saturate(180%);
  --translucent-background: rgba(255, 255, 255, 0.7);
  --translucent-blur: blur(15px);
  --translucent-border: rgba(93, 142, 220, 0.2);
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-background);
  overflow-x: hidden;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--spacing-sm);
}

h1 {
  font-size: clamp(2.5rem, 5vw, 3.5rem);
  color: var(--color-text);
}

h2 {
  font-size: clamp(2rem, 4vw, 2.5rem);
  color: var(--color-primary);
}

h3 {
  font-size: 1.5rem;
  color: var(--color-text);
}

p {
  margin-bottom: var(--spacing-sm);
  color: var(--color-text-muted);
}

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

/* Header */
.main-header {
  background: var(--frosted-background);
  backdrop-filter: var(--frosted-blur);
  border-bottom: 1px solid var(--glass-border);
  position: sticky;
  top: 0;
  z-index: 100;
  padding: var(--spacing-sm) 0;
}

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

.logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-primary);
  text-decoration: none;
}

.logo img {
  height: 32px;
  width: auto;
}

.main-nav ul {
  display: flex;
  list-style: none;
  gap: var(--spacing-lg);
}

.main-nav a {
  color: var(--color-text);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.2s ease;
}

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

/* Hero Section */
.hero {
  padding: var(--spacing-2xl) 0;
  text-align: center;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
  color: white;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--glass-background);
  backdrop-filter: var(--glass-blur);
}

.hero-content {
  position: relative;
  z-index: 2;
}

.hero h1 {
  color: white;
  margin-bottom: var(--spacing-md);
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.hero p {
  font-size: 1.2rem;
  margin-bottom: var(--spacing-xl);
  color: rgba(255, 255, 255, 0.9);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: 12px 24px;
  border: none;
  border-radius: var(--border-radius);
  font-size: 1rem;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  white-space: nowrap;
}

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

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

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

.btn-accent:hover {
  background: var(--color-accent-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow-medium);
}

.btn-glass {
  background: var(--glass-background);
  backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border);
  color: var(--color-text);
}

.btn-glass:hover {
  background: rgba(93, 142, 220, 0.2);
  transform: scale(1.02);
  box-shadow: var(--shadow-glass);
}

/* Cards */
.card {
  background: white;
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-md);
  box-shadow: var(--shadow-light);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

.glass-card {
  background: var(--translucent-background);
  backdrop-filter: var(--translucent-blur);
  border: 1px solid var(--translucent-border);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-glass);
  padding: var(--spacing-md);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.glass-card:hover {
  transform: translateY(-2px) scale(1.01);
  box-shadow: var(--shadow-heavy);
}

/* Features Section */
.features {
  padding: var(--spacing-2xl) 0;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-lg);
  margin-top: var(--spacing-xl);
}

.feature-card {
  text-align: center;
  padding: var(--spacing-xl);
}

.feature-icon {
  font-size: 3rem;
  margin-bottom: var(--spacing-md);
  display: block;
}

/* Forms */
.form-group {
  margin-bottom: var(--spacing-md);
}

.form-group label {
  display: block;
  margin-bottom: var(--spacing-xs);
  font-weight: 600;
  color: var(--color-text);
}

.form-input,
.form-textarea {
  width: 100%;
  padding: 12px var(--spacing-sm);
  border: 1px solid rgba(31, 45, 61, 0.2);
  border-radius: var(--border-radius-sm);
  font-size: 1rem;
  transition: all 0.2s ease;
  background: white;
}

.form-input:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(93, 142, 220, 0.1);
}

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

/* Contact Section */
.contact {
  padding: var(--spacing-2xl) 0;
  background: white;
}

.contact-form {
  max-width: 600px;
  margin: 0 auto;
}

/* Messages */
.messages {
  margin: var(--spacing-md) 0;
}

.alert {
  padding: var(--spacing-sm);
  border-radius: var(--border-radius-sm);
  margin-bottom: var(--spacing-sm);
  border: 1px solid transparent;
}

.alert-success {
  background: rgba(161, 193, 129, 0.1);
  color: var(--color-secondary);
  border-color: var(--color-secondary);
}

.alert-error {
  background: rgba(255, 107, 107, 0.1);
  color: var(--color-accent);
  border-color: var(--color-accent);
}

/* Footer */
.main-footer {
  background: var(--color-text);
  color: white;
  padding: var(--spacing-xl) 0;
  text-align: center;
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-lg);
}

.footer-section h4 {
  color: var(--color-primary);
  margin-bottom: var(--spacing-sm);
}

.footer-links {
  list-style: none;
}

.footer-links a {
  color: rgba(255, 255, 255, 0.8);
  text-decoration: none;
  transition: color 0.2s ease;
}

.footer-links a:hover {
  color: var(--color-primary);
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: var(--spacing-sm);
  color: rgba(255, 255, 255, 0.6);
}

/* Responsive Design */
@media (max-width: 768px) {
  .nav-container {
    flex-direction: column;
    gap: var(--spacing-sm);
  }
  
  .main-nav ul {
    gap: var(--spacing-md);
    flex-wrap: wrap;
    justify-content: center;
  }
  
  .hero {
    padding: var(--spacing-xl) 0;
  }
  
  .features-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
  }
  
  .container {
    padding: 0 var(--spacing-sm);
  }
  
  .footer-content {
    grid-template-columns: 1fr;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .btn {
    width: 100%;
    justify-content: center;
  }
  
  .feature-card {
    padding: var(--spacing-md);
  }
  
  .main-nav ul {
    gap: var(--spacing-sm);
    font-size: 0.9rem;
  }
  
  h1 {
    font-size: 2rem;
  }
  
  h2 {
    font-size: 1.8rem;
  }
}