:root {

  /* Primitive Color Tokens */
  --color-white: rgba(255, 255, 255, 1);
  --color-black: rgba(0, 0, 0, 1);
  
  /* Light Theme Base Colors */
  --color-slate-50: rgba(248, 250, 252, 1);
  --color-slate-100: rgba(241, 245, 249, 1);
  --color-slate-300: rgba(203, 213, 225, 1);
  --color-slate-400: rgba(148, 163, 184, 1);
  --color-slate-600: rgba(71, 85, 105, 1);
  --color-slate-900: rgba(15, 23, 42, 1);
  
  /* Dark Theme Base Colors */
  --color-dark-100: rgba(11, 15, 25, 1);
  --color-dark-200: rgba(15, 20, 30, 1);
  
  /* Teal Accent Colors - Primary Theme */
  --color-teal-300: rgba(94, 234, 212, 1);
  --color-teal-400: rgba(45, 212, 191, 1);
  --color-teal-500: rgba(20, 184, 166, 1);
  --color-teal-600: rgba(13, 148, 136, 1);
  --color-teal-light: rgba(56, 189, 168, 1);

  /* RGB versions for opacity control */
  --color-teal-500-rgb: 20, 184, 166;
  --color-teal-light-rgb: 56, 189, 168;
  --color-teal-400-rgb: 45, 212, 191;
  --color-slate-900-rgb: 15, 23, 42;
  --color-slate-600-rgb: 71, 85, 105;
  --color-slate-400-rgb: 148, 163, 184;

  /* Semantic Color Tokens (Light Mode) */
  --color-background: var(--color-slate-50);
  --color-surface: var(--color-white);
  --color-text: var(--color-slate-900);
  --color-text-secondary: var(--color-slate-600);
  --color-primary: var(--color-teal-light);
  --color-primary-hover: var(--color-teal-500);
  --color-primary-active: var(--color-teal-600);
  --color-border: rgba(var(--color-slate-400-rgb), 0.2);
  --color-focus-ring: rgba(var(--color-teal-light-rgb), 0.3);

  /* Navigation */
  --navbar-bg: var(--color-surface);
  --border-color: var(--color-border);

  /* Typography */
  --font-family-base: "Inter", "SF Pro Display", -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  --font-size-sm: 12px;
  --font-size-base: 14px;
  --font-size-lg: 16px;
  --font-size-xl: 18px;
  --font-size-2xl: 20px;
  --font-size-3xl: 24px;
  --font-size-4xl: 30px;
  --font-weight-medium: 500;
  --font-weight-bold: 600;
  --line-height-tight: 1.2;
  --line-height-normal: 1.5;

  /* Spacing */
  --space-12: 12px;
  --space-16: 16px;
  --space-20: 20px;
  --space-24: 24px;
  --space-32: 32px;

  /* Shadows */
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.04), 0 4px 6px -2px rgba(0, 0, 0, 0.02);

  /* Animation */
  --duration-normal: 250ms;
  --ease-standard: cubic-bezier(0.16, 1, 0.3, 1);

}

/* Dark mode colors */
@media (prefers-color-scheme: dark) {
  :root {
    --color-teal-400-rgb: 45, 212, 191;
    --color-primary: var(--color-teal-400);
    --color-primary-hover: var(--color-teal-300);
    --color-primary-active: var(--color-teal-500);
    --color-background: var(--color-dark-100);
    --color-surface: var(--color-dark-200);
    --color-text: var(--color-slate-100);
    --color-text-secondary: var(--color-slate-400);
    --color-border: rgba(var(--color-slate-400-rgb), 0.2);
    --color-focus-ring: rgba(var(--color-teal-400-rgb), 0.3);
    --navbar-bg: var(--color-surface);
    --border-color: var(--color-border);
  }
}

/* Data attribute for manual theme switching */
[data-color-scheme="dark"] {
  --color-teal-400-rgb: 45, 212, 191;
  --color-primary: var(--color-teal-400);
  --color-primary-hover: var(--color-teal-300);
  --color-primary-active: var(--color-teal-500);
  --color-background: var(--color-dark-100);
  --color-surface: var(--color-dark-200);
  --color-text: var(--color-slate-100);
  --color-text-secondary: var(--color-slate-400);
  --color-border: rgba(var(--color-slate-400-rgb), 0.2);
  --color-focus-ring: rgba(var(--color-teal-400-rgb), 0.3);
  --navbar-bg: var(--color-surface);
  --border-color: var(--color-border);
}

[data-color-scheme="light"] {
  --color-teal-500-rgb: 20, 184, 166;
  --color-teal-light-rgb: 56, 189, 168;
  --color-primary: var(--color-teal-light);
  --color-primary-hover: var(--color-teal-500);
  --color-primary-active: var(--color-teal-600);
  --color-focus-ring: rgba(var(--color-teal-light-rgb), 0.3);
}

/* Base styles */
html {
  font-size: var(--font-size-base);
  font-family: var(--font-family-base);
  line-height: var(--line-height-normal);
  color: var(--color-text);
  background-color: var(--color-background);
  -webkit-font-smoothing: antialiased;
  box-sizing: border-box;
  height: 100%;
}

body {
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
}

*,
*::before,
*::after {
  box-sizing: inherit;
}

/* Animated Background */
.animated-bg {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: -1;
  overflow: hidden;
}

.gradient-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.3;
  animation: floatComplex 25s infinite ease-in-out;
}

.orb-1 {
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, var(--color-primary), transparent 70%);
  top: -10%;
  left: -10%;
  animation-delay: 0s;
  animation-duration: 30s;
}

.orb-2 {
  width: 300px;
  height: 300px;
  background: radial-gradient(circle, var(--color-teal-400), transparent 70%);
  bottom: -5%;
  right: -5%;
  animation-delay: 10s;
  animation-duration: 35s;
}

.orb-3 {
  width: 250px;
  height: 250px;
  background: radial-gradient(circle, var(--color-teal-300), transparent 70%);
  top: 40%;
  right: 20%;
  animation-delay: 20s;
  animation-duration: 40s;
}

@keyframes floatComplex {
  0% {
    transform: translate(0, 0) scale(1) rotate(0deg);
    opacity: 0.3;
  }
  25% {
    transform: translate(40px, -50px) scale(1.1) rotate(90deg);
    opacity: 0.4;
  }
  50% {
    transform: translate(-30px, 30px) scale(0.9) rotate(180deg);
    opacity: 0.2;
  }
  75% {
    transform: translate(50px, -20px) scale(1.05) rotate(270deg);
    opacity: 0.35;
  }
  100% {
    transform: translate(0, 0) scale(1) rotate(360deg);
    opacity: 0.3;
  }
}

/* Dark mode background adjustments */
[data-color-scheme="dark"] .gradient-orb {
  opacity: 0.4;
  filter: blur(90px);
}

@media (prefers-color-scheme: dark) {
  .gradient-orb {
    opacity: 0.4;
    filter: blur(90px);
  }
}

/* Page Layout */
.main-content {
  flex: 1;
  position: relative;
}

.page {
  position: relative;
  width: 100%;
  opacity: 1;
  visibility: visible;
  transition: opacity 0.3s ease-in-out, visibility 0.3s ease-in-out;
  overflow-y: auto;
  overflow-x: hidden;
}

.page.active {
  opacity: 1;
  visibility: visible;
}

.page-content {
  min-height: 100vh;
  min-height: 100svh;               /* Modern browsers: small viewport height */
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 70px 16px 60px 16px;     /* Navbar height + footer space + horizontal padding */
  box-sizing: border-box;
}

/* Hero Section for About Page */
.hero-section {
  text-align: center;
  max-width: 800px;
  margin: 0 auto;
  padding: 0 16px;
  width: 100%;
}

.hero-image {
  margin-bottom: var(--space-24);
}

.profile-pic {
  width: 150px;
  height: 150px;
  border-radius: 50%;
  object-fit: cover;
  border: 4px solid var(--color-primary);
  box-shadow: var(--shadow-lg);
  transition: transform var(--duration-normal) var(--ease-standard);
}

.profile-pic:hover {
  transform: scale(1.05);
}

.hero-title {
  font-size: 3rem;
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--space-16);
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-hover));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: 1.5rem;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-16);
}

.hero-description {
  font-size: 1.1rem;
  line-height: 1.6;
  margin-bottom: var(--space-12);
}

/* Social Icons */
.social-icons {
  display: flex;
  gap: var(--space-20);
  justify-content: center;
  align-items: center;
  margin-top: var(--space-16);
  padding: var(--space-12) 0;
}

.social-icons a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  background: var(--color-surface);
  border: 2px solid var(--color-border);
  border-radius: 12px;
  color: var(--color-text-secondary);
  text-decoration: none;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.social-icons a:hover {
  transform: translateY(-2px);
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-white);
  box-shadow: 0 4px 16px rgba(var(--color-teal-500-rgb), 0.3);
}

.social-icons a:focus {
  outline: none;
  box-shadow: 0 0 0 3px var(--color-focus-ring);
}

.social-icons i {
  font-size: 1.2rem;
  transition: transform 0.2s ease;
}

.social-icons a:hover i {
  transform: scale(1.1);
}

/* Specific icon colors on hover - instant transitions */
.social-icons a[aria-label="GitHub"]:hover {
  background: #333 !important;
  border-color: #333 !important;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.social-icons a[aria-label="LinkedIn"]:hover {
  background: #0077b5 !important;
  border-color: #0077b5 !important;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.social-icons a[aria-label="X"]:hover {
  background: #000 !important;
  border-color: #000 !important;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.social-icons a[aria-label="Medium"]:hover {
  background: #000 !important;
  border-color: #000 !important;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.social-icons a[aria-label="Portfolio Website"]:hover {
  background: var(--color-primary) !important;
  border-color: var(--color-primary) !important;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

/* Dark theme adjustments */
[data-color-scheme="dark"] .social-icons a {
  background: var(--color-surface);
  border-color: rgba(var(--color-slate-400-rgb), 0.3);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}

[data-color-scheme="dark"] .social-icons a:hover {
  box-shadow: 0 4px 16px rgba(var(--color-teal-400-rgb), 0.4);
}

/* Theme Toggle Styles */
.theme-toggle-container {
  display: flex;
  align-items: center;
  margin-left: auto;
}

.theme-toggle {
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
  border-radius: 20px;
  transition: all 0.3s ease;
}

.theme-toggle:focus {
  outline: none;
  box-shadow: none;
}

.theme-toggle-track {
  position: relative;
  width: 60px;
  height: 30px;
  background: var(--color-slate-400);
  border-radius: 15px;
  transition: all 0.3s ease;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 6px;
  border: 2px solid var(--color-slate-300);
}

[data-color-scheme="light"] .theme-toggle-track {
  background: var(--color-teal-light);
  border-color: var(--color-teal-400);
}

.theme-toggle-thumb {
  position: absolute;
  width: 22px;
  height: 22px;
  background: white;
  border-radius: 50%;
  transition: transform 0.3s ease;
  left: 4px;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

[data-color-scheme="light"] .theme-toggle-thumb {
  transform: translateX(30px);
}

.theme-toggle-icons {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  position: relative;
  z-index: 1;
  pointer-events: none;
}

.theme-icon {
  font-size: 14px;
  transition: opacity 0.3s ease;
}

.sun-icon {
  opacity: 0;
}

.moon-icon {
  opacity: 1;
}

[data-color-scheme="light"] .sun-icon {
  opacity: 1;
}

[data-color-scheme="light"] .moon-icon {
  opacity: 0;
}

/* Theme Toggle Hover Effects */
.theme-toggle:hover .theme-toggle-track {
  border-color: var(--color-teal-400);
}

[data-color-scheme="light"] .theme-toggle:hover .theme-toggle-track {
  background: var(--color-teal-500);
  border-color: var(--color-teal-300);
}

/* Typography */
h1,
h2,
h3,
h4,
h5,
h6 {
  margin: 0;
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-tight);
  color: var(--color-text);
}

h1 { font-size: var(--font-size-4xl); }
h2 { font-size: var(--font-size-3xl); }
h3 { font-size: var(--font-size-2xl); }
h4 { font-size: var(--font-size-xl); }
h5 { font-size: var(--font-size-lg); }
h6 { font-size: var(--font-size-base); }

p {
  margin: 0 0 var(--space-16) 0;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--duration-normal) var(--ease-standard);
}

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

/* Layout utilities */
.container {
  max-width: 1024px;
  margin: 0 auto;
  padding: 0 var(--space-16);
}

/* Navigation */
.navbar {
  position: fixed;
  top: 0;
  width: 100%;
  background: var(--navbar-bg);
  border-bottom: 1px solid var(--border-color);
  z-index: 1000;
  transition: all var(--duration-normal) var(--ease-standard);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 1200px;
  margin: 0 auto;
  padding-left: 32px;
  padding-right: 32px;
  height: 70px;
  position: relative;
}

.nav-logo {
  flex: 0 0 auto;
  display: flex;
  align-items: center;
  justify-content: flex-start;
  margin-right: 0;
}

@media (min-width: 1200px) {
  .nav-container {
    padding-left: 0;
    padding-right: 0;
  }
  .nav-logo {
    margin-left: 32px;
  }
  .theme-toggle-container {
    margin-right: 32px;
  }
  
  .hero-section {
    padding: 0 20px;
  }
  
  .social-icons {
    gap: 32px;
  }
  
  .social-icons a {
    width: 52px;
    height: 52px;
    font-size: 24px;
  }
}

.nav-logo h3 {
  color: var(--color-primary);
  font-weight: var(--font-weight-bold);
  font-size: var(--font-size-2xl);
  font-family: 'Courier New', monospace;
  letter-spacing: 0.05em;
  transition: transform var(--duration-normal) var(--ease-standard);
}

.logo-container:hover {
  transform: scale(1.05);
}

/* Tooltip styling */
.logo-container {
  position: relative;
  cursor: pointer;
}

.logo-container::after {
  content: attr(data-tooltip);
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%);
  background: var(--color-surface);
  color: var(--color-text);
  padding: 8px 12px;
  border-radius: 6px;
  font-size: var(--font-size-sm);
  font-family: var(--font-family-base);
  font-weight: var(--font-weight-medium);
  white-space: nowrap;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
  border: 1px solid var(--color-border);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
  z-index: 1001;
  margin-top: 8px;
}

.logo-container:hover::after {
  opacity: 1;
  visibility: visible;
}

/* Section */
.section {
  padding: var(--space-16) 0;
}

/* Mobile Responsive */
@media (max-width: 768px) {

  .hero-title {
    font-size: 1.8rem;
    line-height: 1.3;
    margin-bottom: 12px;
  }

  .hero-subtitle {
    font-size: 1.1rem;
    margin-bottom: 16px;
  }

  .hero-description {
    font-size: 1rem;
    line-height: 1.5;
    margin-bottom: 20px;
  }

  .hero-description p {
    margin-bottom: 12px;
  }

  .profile-pic {
    width: 100px;
    height: 100px;
    margin-bottom: 16px;
  }

  .hero-image {
    margin-bottom: 16px;
  }

  .container {
    padding: 0 16px;
  }

  .nav-logo h3 {
    font-size: var(--font-size-lg);
  }

  /* Enhanced social icons for mobile */
  .social-icons {
    gap: 16px;
    margin-top: 20px;
    padding: 16px 0;
    flex-wrap: wrap;
    justify-content: center;
  }

  .social-icons a {
    width: 44px;
    height: 44px;
    font-size: 1.1rem;
  }

  /* Reduce background elements on mobile */
  .gradient-orb {
    filter: blur(60px);
    opacity: 0.15;
  }
  
  .orb-1 {
    width: 200px;
    height: 200px;
  }
  
  .orb-2, .orb-3 {
    width: 150px;
    height: 150px;
  }

  /* Mobile navigation adjustments */
  .nav-container {
    padding-left: 16px;
    padding-right: 16px;
    height: 60px;
  }

  .theme-toggle-track {
    width: 50px;
    height: 26px;
  }

  .theme-toggle-thumb {
    width: 18px;
    height: 18px;
  }

  [data-color-scheme="light"] .theme-toggle-thumb {
    transform: translateX(24px);
  }

  .theme-icon {
    font-size: 12px;
  }

  /* Mobile page content */
  .page-content {
    padding: 80px 0 60px 0;
    min-height: 100vh;
    justify-content: flex-start;
    padding-top: 100px;
  }

  .hero-section {
    max-width: 100%;
    padding: 0 8px;
  }

}

/* Extra small devices */
@media (max-width: 480px) {
  .hero-title {
    font-size: 1.6rem;
  }

  .hero-subtitle {
    font-size: 1rem;
  }

  .hero-description {
    font-size: 0.9rem;
  }

  .container {
    padding: 0 12px;
  }

  .social-icons {
    gap: 12px;
  }

  .social-icons a {
    width: 40px;
    height: 40px;
    font-size: 1rem;
  }

  .nav-container {
    padding-left: 12px;
    padding-right: 12px;
  }

  .profile-pic {
    width: 80px;
    height: 80px;
  }

  .page-content {
    padding-top: 80px;
  }
}

/* Tablet devices */
@media (min-width: 769px) and (max-width: 1024px) {
  .hero-title {
    font-size: 2.5rem;
  }

  .hero-subtitle {
    font-size: 1.3rem;
  }

  .profile-pic {
    width: 130px;
    height: 130px;
  }

  .container {
    padding: 0 24px;
  }

  .social-icons {
    gap: 18px;
  }
}

/* Footer Styles */
.footer {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding: var(--space-12) 0;
  text-align: center;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 100;
}

.footer p {
  margin: 0;
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  letter-spacing: 0.025em;
  font-family: var(--font-family-base);
}

.footer a {
  color: var(--color-primary);
  text-decoration: none;
  font-weight: var(--font-weight-medium);
  transition: color var(--duration-normal) var(--ease-standard);
}

.footer a:hover {
  color: var(--color-primary-hover);
  text-decoration: underline;
}

/* Responsive footer */
@media (max-width: 768px) {
  .footer {
    padding: var(--space-12) 0;
  }
  .footer p {
    font-size: var(--font-size-sm);
  }
}