/* ===== CSS VARIABLES ===== */
:root {
  /* Colors */
  --primary-color: #008fa5;
  --primary-color-alt: #00616f;
  --secondary-color: #64748b;
  --accent-color: #f59e0b;
  
  /* Text Colors */
  --title-color: #87adb8ff;
  --text-color: #475569;
  --text-color-light: #64748b;
  --body-color: #f8fafc;
  --container-color: #ffffff;
  
  /* Background Colors */
  --bg-color: #ffffff;
  --bg-color-alt: #f1f5f9;
  --card-bg: #ffffff;
  --overlay-bg: rgba(0, 0, 0, 0.5);
  
  /* Border & Shadow */
  --border-color: #e2e8f0;
  --shadow-light: 0 2px 4px rgba(0, 0, 0, 0.1);
  --shadow-medium: 0 4px 6px rgba(0, 0, 0, 0.1);
  --shadow-large: 0 10px 15px rgba(0, 0, 0, 0.1);
  
  /* Typography */
  --body-font: 'Barlow', sans-serif;
  --title-font: 'Barlow', sans-serif;
  --code-font: 'JetBrains Mono', monospace;
  
  /* Font Sizes */
  --biggest-font-size: 2.5rem;
  --h1-font-size: 2.25rem;
  --h2-font-size: 1.875rem;
  --h3-font-size: 1.5rem;
  --normal-font-size: 1rem;
  --small-font-size: 0.875rem;
  --smaller-font-size: 0.75rem;
  
  /* Font Weights */
  --font-light: 300;
  --font-regular: 400;
  --font-medium: 500;
  --font-semi-bold: 600;
  --font-bold: 700;
  
  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  --spacing-3xl: 2rem;
  
  /* Layout */
  --container-max-width: 1200px;
  --header-height: 4rem;
  --section-padding: 4rem 0;
  
  /* Border Radius */
  --border-radius-sm: 0.375rem;
  --border-radius-md: 0.5rem;
  --border-radius-lg: 0.75rem;
  --border-radius-xl: 1rem;
  
  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-medium: 0.3s ease;
  --transition-slow: 0.5s ease;
  
  /* Z-index */
  --z-tooltip: 10;
  --z-fixed: 100;
  --z-modal: 1000;
  
  /* Breakpoints (for reference in media queries) */
  --mobile: 320px;
  --tablet: 768px;
  --desktop: 1024px;
  --large-desktop: 1200px;
}

/* Dark theme variables */
[data-theme="dark"] {
  --title-color: #f1f5f9;
  --text-color: #cbd5e1;
  --text-color-light: #94a3b8;
  --body-color: #0f172a;
  --container-color: #1e293b;
  --bg-color: #0f172a;
  --bg-color-alt: #1e293b;
  --card-bg: #1e293b;
  --border-color: #334155;
  --overlay-bg: rgba(0, 0, 0, 0.7);
}

/* ===== BASE STYLES ===== */
#fluid-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none; /* Let clicks pass through */
  z-index: 0; /* Behind everything */
  opacity: 0.6; /* Subtle effect */
}

#preloader {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: var(--body-color);
  z-index: 9999;
  display: flex;
  justify-content: center;
  align-items: center;
  transition: opacity 0.5s ease-out, visibility 0.5s ease-out;
}

#preloader.fade-out {
  opacity: 0;
  visibility: hidden;
}

.loader-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-md);
}

.loader-logo {
  color: var(--primary-color);
  animation: pulse 2s infinite ease-in-out;
}

.loader-circle {
  stroke-dasharray: 283; /* 2 * PI * 45 */
  stroke-dashoffset: 283;
  animation: dash 2s ease-in-out infinite;
  transform-origin: center;
}

.loader-text {
  font-family: var(--code-font);
  font-size: var(--small-font-size);
  color: var(--text-color-light);
  letter-spacing: 2px;
  text-transform: uppercase;
}

@keyframes dash {
  0% {
    stroke-dashoffset: 283;
    transform: rotate(0deg);
  }
  50% {
    stroke-dashoffset: 70;
    transform: rotate(180deg);
  }
  100% {
    stroke-dashoffset: 283;
    transform: rotate(360deg);
  }
}

@keyframes pulse {
  0%, 100% { transform: scale(1); opacity: 1; }
  50% { transform: scale(0.95); opacity: 0.8; }
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--body-font);
  font-size: var(--normal-font-size);
  font-weight: var(--font-regular);
  background-color: var(--body-color);
  color: var(--text-color);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4 {
  color: var(--title-color);
  font-weight: var(--font-semi-bold);
  line-height: 1.2;
}

ul {
  list-style: none;
}

a {
  text-decoration: none;
  color: inherit;
}

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

button {
  cursor: pointer;
  border: none;
  outline: none;
  font-family: inherit;
}

input, textarea {
  font-family: inherit;
  font-size: inherit;
}

/* ===== REUSABLE CSS CLASSES ===== */
.container {
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

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

.section {
  padding: var(--section-padding);
}

.section__title {
  font-size: var(--h2-font-size);
  color: var(--title-color);
  text-align: center;
  margin-bottom: var(--spacing-sm);
}

.section__subtitle {
  display: block;
  font-size: var(--small-font-size);
  color: var(--text-color-light);
  text-align: center;
  margin-bottom: var(--spacing-2xl);
}

/* Button Styles */
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background-color: var(--primary-color);
  color: #ffffff;
  padding: var(--spacing-sm) var(--spacing-lg);
  border-radius: var(--border-radius-md);
  font-weight: var(--font-medium);
  transition: var(--transition-medium);
  text-decoration: none;
  border: 2px solid var(--primary-color);
  cursor: pointer;
  font-size: var(--normal-font-size);
}

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

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

.button--outline:hover {
  background-color: var(--primary-color);
  color: #ffffff;
}

.button--primary {
  background-color: var(--primary-color);
  border-color: var(--primary-color);
}

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

.mb-1 { margin-bottom: var(--spacing-xs); }
.mb-2 { margin-bottom: var(--spacing-sm); }
.mb-3 { margin-bottom: var(--spacing-md); }
.mb-4 { margin-bottom: var(--spacing-lg); }

.mt-1 { margin-top: var(--spacing-xs); }
.mt-2 { margin-top: var(--spacing-sm); }
.mt-3 { margin-top: var(--spacing-md); }
.mt-4 { margin-top: var(--spacing-lg); }

.hidden { display: none; }
.visible { display: block; }

/* Animation Classes */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

.slide-up {
  transform: translateY(30px);
  opacity: 0;
  transition: transform 0.6s ease, opacity 0.6s ease;
}

.slide-up.visible {
  transform: translateY(0);
  opacity: 1;
}/* 
===== PERFORMANCE OPTIMIZATIONS ===== */

/* Critical CSS for above-the-fold content */
.hero {
  contain: layout style paint;
  will-change: transform;
}

.nav {
  contain: layout style;
  transform: translateZ(0); /* Force hardware acceleration */
}

/* Optimize animations for performance */
.fade-in,
.slide-up,
.project__card,
.research__card {
  will-change: transform, opacity;
  backface-visibility: hidden;
  perspective: 1000px;
}

/* Optimize images for performance */
img {
  content-visibility: auto;
  contain-intrinsic-size: 300px 200px;
}

.hero__img,
.project__img {
  image-rendering: -webkit-optimize-contrast;
  image-rendering: crisp-edges;
}

/* Optimize fonts */
@font-face {
  font-family: 'Inter';
  font-display: swap;
  font-weight: 300 700;
  src: url('https://fonts.gstatic.com/s/inter/v12/UcCO3FwrK3iLTeHuS_fvQtMwCp50KnMw2boKoduKmMEVuLyfAZ9hiA.woff2') format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+2000-206F, U+2074, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}

/* Reduce layout shifts */
.section {
  min-height: 50vh;
}

.container {
  contain: layout;
}

/* Optimize scrolling performance */
.section,
.container {
  scroll-behavior: smooth;
  -webkit-overflow-scrolling: touch;
}

/* GPU acceleration for smooth animations */
.button,
.nav__link,
.project__card,
.research__card {
  transform: translateZ(0);
}

/* Optimize repaints */
.hero__blob,
.research__progress-fill {
  contain: strict;
}

/* Image placeholder styles */
.image-placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background-color: var(--bg-color-alt);
  color: var(--text-color-light);
  padding: var(--spacing-xl);
  border-radius: var(--border-radius-md);
  min-height: 200px;
}

.image-placeholder svg {
  width: 48px;
  height: 48px;
  margin-bottom: var(--spacing-md);
  opacity: 0.5;
}

.image-placeholder span {
  font-size: var(--small-font-size);
  text-align: center;
}

/* Loading states */
.loading {
  position: relative;
  overflow: hidden;
}

.loading::after {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
  animation: loading-shimmer 1.5s infinite;
}

@keyframes loading-shimmer {
  0% { left: -100%; }
  100% { left: 100%; }
}

/* Optimize for different connection speeds */
@media (prefers-reduced-data: reduce) {
  .hero__blob::before,
  .research__progress-fill::after {
    display: none;
  }
  
  .hero__blob {
    animation: none;
  }
  
  .page-loader {
    display: none;
  }
}

/* Optimize for battery saving */
@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  
  .hero__blob,
  .research__progress-fill {
    animation: none !important;
  }
}

/* Print optimizations */
@media print {
  * {
    background: transparent !important;
    color: black !important;
    box-shadow: none !important;
    text-shadow: none !important;
  }
  
  .hero,
  .section {
    page-break-inside: avoid;
  }
  
  .project__card,
  .research__card {
    break-inside: avoid;
    border: 1px solid #ccc;
    margin-bottom: 1rem;
  }
}

/* ===== HERO ===== */
.hero {
  position: relative;
  overflow: hidden; /* Ensure canvas stays inside */
  background-color: var(--body-color); /* Fallback */
  z-index: 1; /* Establish stacking context */
}

/* New: Canvas Background */
.hero__canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1; 
  opacity: 0.6;
  filter: blur(40px);
  pointer-events: none;
}

/* Cursor removed by user request */

.hero__container {
  gap: 1rem;
}
/* ===== FOOTER ===== */
.footer {
  background-color: var(--text-color); /* Darker background */
  color: var(--body-color); /* Light text */
  padding: 2rem 0;
  text-align: center;
  margin-top: auto;
}

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

.footer__copy {
  font-size: var(--small-font-size);
  color: var(--body-color); /* Ensure text is light */
  text-align: center;
  margin: 0; /* Remove default margin to fix bottom space */
}