/*
 * AquaCORTEX Premium Website Stylesheet
 * Color Palette: Dark Navy + Teal + Metallic Gradients + Bioluminescent Accents
 * Design Philosophy: Clean Modernism, High-Tech Authenticity, Organic-Tech Fusion
 */

/* ========================================
   CSS VARIABLES & DESIGN TOKENS
   ======================================== */
:root {
  /* Primary Color Palette */
  --color-navy-deep: #0a1628;
  --color-navy-dark: #0f1f3d;
  --color-navy: #162e52;
  --color-navy-light: #1e3a5f;
  
  /* Teal Accents */
  --color-teal-bright: #00d9ff;
  --color-teal: #00b8d4;
  --color-teal-dark: #008fa1;
  --color-teal-deep: #006674;
  
  /* Bioluminescent Accents */
  --color-bio-cyan: #00ffff;
  --color-bio-teal: #00e5cc;
  --color-bio-green: #00ff9f;
  
  /* Metallic Gradients */
  --gradient-metallic-primary: linear-gradient(135deg, #1e3a5f 0%, #00b8d4 100%);
  --gradient-metallic-secondary: linear-gradient(135deg, #0a1628 0%, #006674 50%, #00d9ff 100%);
  --gradient-metallic-accent: linear-gradient(90deg, #00b8d4 0%, #00ffff 50%, #00b8d4 100%);
  
  /* Neutral Colors */
  --color-white: #ffffff;
  --color-gray-light: #e5e7eb;
  --color-gray: #9ca3af;
  --color-gray-dark: #4b5563;
  --color-black: #000000;
  
  /* Typography */
  --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-heading: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  
  /* Spacing Scale */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-2xl: 4rem;
  --spacing-3xl: 6rem;
  
  /* Border Radius */
  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 1rem;
  --radius-xl: 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);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
  --shadow-glow-teal: 0 0 20px rgba(0, 184, 212, 0.4);
  --shadow-glow-cyan: 0 0 30px rgba(0, 255, 255, 0.3);
  
  /* Transitions */
  --transition-fast: 150ms ease-in-out;
  --transition-base: 300ms ease-in-out;
  --transition-slow: 500ms ease-in-out;
  
  /* Z-Index Scale */
  --z-base: 1;
  --z-dropdown: 10;
  --z-sticky: 100;
  --z-fixed: 200;
  --z-modal: 1000;
  --z-tooltip: 1100;
}

/* ========================================
   RESET & BASE STYLES
   ======================================== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-primary);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--color-white);
  background-color: var(--color-navy-deep);
  overflow-x: hidden;
}

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

/* ========================================
   TYPOGRAPHY
   ======================================== */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--spacing-md);
  color: var(--color-white);
}

h1 {
  font-size: clamp(2.5rem, 5vw, 4rem);
  letter-spacing: -0.02em;
}

h2 {
  font-size: clamp(2rem, 4vw, 3rem);
  letter-spacing: -0.01em;
}

h3 {
  font-size: clamp(1.5rem, 3vw, 2rem);
}

h4 {
  font-size: clamp(1.25rem, 2.5vw, 1.5rem);
}

h5 {
  font-size: 1.125rem;
}

h6 {
  font-size: 1rem;
}

p {
  margin-bottom: var(--spacing-md);
  color: var(--color-gray-light);
}

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

a:hover {
  color: var(--color-bio-cyan);
}

a:focus-visible {
  outline: 2px solid var(--color-teal-bright);
  outline-offset: 4px;
  border-radius: var(--radius-sm);
}

/* ========================================
   LAYOUT UTILITIES
   ======================================== */
.container {
  width: 100%;
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

@media (min-width: 768px) {
  .container {
    padding: 0 var(--spacing-lg);
  }
}

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

.section {
  padding: var(--spacing-3xl) 0;
}

@media (max-width: 768px) {
  .section {
    padding: var(--spacing-2xl) 0;
  }
}

/* ========================================
   BUTTONS
   ======================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-xs);
  padding: 0.875rem 2rem;
  font-size: 1rem;
  font-weight: 600;
  line-height: 1;
  text-align: center;
  white-space: nowrap;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-base);
  text-decoration: none;
  min-height: 44px; /* Accessibility: touch target size */
  min-width: 44px;
}

.btn-primary {
  background: var(--gradient-metallic-primary);
  color: var(--color-white);
  box-shadow: var(--shadow-glow-teal);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-glow-teal), var(--shadow-xl);
}

.btn-primary:active {
  transform: translateY(0);
}

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

.btn-secondary:hover {
  background: var(--color-teal);
  color: var(--color-white);
  border-color: var(--color-teal-bright);
  box-shadow: var(--shadow-glow-teal);
}

.btn-tertiary {
  background: transparent;
  color: var(--color-teal-bright);
  text-decoration: underline;
  text-underline-offset: 4px;
}

.btn-tertiary:hover {
  color: var(--color-bio-cyan);
}

/* ========================================
   CARDS
   ======================================== */
.card {
  background: linear-gradient(135deg, rgba(22, 46, 82, 0.6) 0%, rgba(10, 22, 40, 0.8) 100%);
  border: 1px solid rgba(0, 184, 212, 0.2);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  transition: all var(--transition-base);
  backdrop-filter: blur(10px);
}

.card:hover {
  border-color: var(--color-teal);
  box-shadow: var(--shadow-glow-teal);
  transform: translateY(-4px);
}

.card-title {
  font-size: 1.5rem;
  margin-bottom: var(--spacing-sm);
  color: var(--color-white);
}

.card-text {
  color: var(--color-gray-light);
  line-height: 1.7;
}

/* ========================================
   NAVIGATION
   ======================================== */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-sticky);
  background: rgba(10, 22, 40, 0.95);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(0, 184, 212, 0.1);
  transition: all var(--transition-base);
}

.nav.scrolled {
  box-shadow: var(--shadow-lg);
  background: rgba(10, 22, 40, 0.98);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-md) var(--spacing-lg);
  max-width: 1400px;
  margin: 0 auto;
}

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

.nav-logo span {
  background: var(--gradient-metallic-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* Logo Image Styles */
.logo-image {
  height: auto;
  max-width: 140px;
  width: auto;
  display: block;
  transition: all var(--transition-base);
}

.nav-logo:hover .logo-image {
  opacity: 0.9;
  transform: scale(1.02);
}

/* Responsive Logo Sizing */
@media (max-width: 1023px) {
  .logo-image {
    max-width: 110px;
  }
}

@media (max-width: 767px) {
  .logo-image {
    max-width: 80px;
  }
}

.nav-menu {
  display: flex;
  gap: var(--spacing-lg);
  list-style: none;
  align-items: center;
}

.nav-link {
  color: var(--color-gray-light);
  font-weight: 500;
  transition: color var(--transition-fast);
  padding: 0.5rem;
}

.nav-link:hover,
.nav-link.active {
  color: var(--color-teal-bright);
}

.nav-toggle {
  display: none;
  background: transparent;
  border: none;
  color: var(--color-white);
  font-size: 1.5rem;
  cursor: pointer;
  padding: 0.5rem;
  min-height: 44px;
  min-width: 44px;
}

/* Mobile Navigation */
@media (max-width: 768px) {
  .nav-toggle {
    display: block;
  }
  
  .nav-menu {
    position: fixed;
    top: 72px;
    left: -100%;
    width: 100%;
    flex-direction: column;
    background: rgba(10, 22, 40, 0.98);
    padding: var(--spacing-lg);
    gap: var(--spacing-md);
    transition: left var(--transition-base);
    align-items: flex-start;
    box-shadow: var(--shadow-xl);
  }
  
  .nav-menu.active {
    left: 0;
  }
}

/* ========================================
   FOOTER
   ======================================== */
.footer {
  background: var(--color-navy-deep);
  border-top: 1px solid rgba(0, 184, 212, 0.2);
  padding: var(--spacing-3xl) 0 var(--spacing-lg);
}

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

.footer-column h4 {
  color: var(--color-teal-bright);
  margin-bottom: var(--spacing-md);
  font-size: 1.125rem;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.footer-link {
  color: var(--color-gray-light);
  transition: color var(--transition-fast);
}

.footer-link:hover {
  color: var(--color-teal-bright);
}

.footer-bottom {
  padding-top: var(--spacing-lg);
  border-top: 1px solid rgba(0, 184, 212, 0.1);
  text-align: center;
  color: var(--color-gray);
  font-size: 0.875rem;
}

/* ========================================
   ANIMATIONS
   ======================================== */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

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

@keyframes float {
  0%, 100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-20px);
  }
}

@keyframes glow {
  0%, 100% {
    opacity: 1;
  }
  50% {
    opacity: 0.5;
  }
}

@keyframes shimmer {
  0% {
    background-position: -1000px 0;
  }
  100% {
    background-position: 1000px 0;
  }
}

.animate-fade-in-up {
  animation: fadeInUp 0.8s ease-out forwards;
}

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

.animate-float {
  animation: float 3s ease-in-out infinite;
}

/* ========================================
   UTILITY CLASSES
   ======================================== */
.text-center {
  text-align: center;
}

.text-gradient {
  background: var(--gradient-metallic-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.glow-teal {
  box-shadow: var(--shadow-glow-teal);
}

.glow-cyan {
  box-shadow: var(--shadow-glow-cyan);
}

.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }
.mt-xl { margin-top: var(--spacing-xl); }
.mt-2xl { margin-top: var(--spacing-2xl); }

.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }
.mb-xl { margin-bottom: var(--spacing-xl); }
.mb-2xl { margin-bottom: var(--spacing-2xl); }

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

/* ========================================
   RESPONSIVE GRID SYSTEM
   ======================================== */
.grid {
  display: grid;
  gap: var(--spacing-lg);
}

.grid-2 {
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.grid-3 {
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.grid-4 {
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

@media (max-width: 768px) {
  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }
}

/* ========================================
   ACCESSIBILITY
   ======================================== */
:focus-visible {
  outline: 2px solid var(--color-teal-bright);
  outline-offset: 4px;
}

.skip-to-content {
  position: absolute;
  top: -100px;
  left: 0;
  background: var(--color-teal);
  color: var(--color-white);
  padding: var(--spacing-sm) var(--spacing-md);
  z-index: var(--z-modal);
  transition: top var(--transition-fast);
}

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