/* ============================================
   CALVIN'S PORTFOLIO - CSS DESIGN SYSTEM
   ============================================ */

/* ============================================
   INTERACTIVE BACKGROUND
   ============================================ */
#bg-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
  background: var(--color-bg-primary);
}

/* ============================================
   GOOGLE FONTS IMPORT
   ============================================ */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Space+Grotesk:wght@400;500;600;700&display=swap');

/* ============================================
   CSS CUSTOM PROPERTIES (DESIGN TOKENS)
   ============================================ */
:root {
  /* Color Palette */
  --color-bg-primary: #0a0a0f;
  --color-bg-secondary: #111118;
  --color-bg-card: rgba(255, 255, 255, 0.03);
  --color-bg-card-hover: rgba(255, 255, 255, 0.06);
  --color-bg-nav: rgba(10, 10, 15, 0.8);

  /* Gradient Colors */
  --color-accent-primary: #6366f1;
  --color-accent-secondary: #8b5cf6;
  --color-accent-tertiary: #06b6d4;
  --color-accent-success: #10b981;
  --color-accent-warning: #f59e0b;

  /* Text Colors */
  --color-text-primary: #ffffff;
  --color-text-secondary: #a8a8b3;
  --color-text-muted: #6b6b76;

  /* Border & Effects */
  --color-border: rgba(255, 255, 255, 0.1);
  --color-glow: rgba(99, 102, 241, 0.3);

  /* Typography */
  --font-heading: 'Space Grotesk', sans-serif;
  --font-body: 'Inter', sans-serif;

  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 1.875rem;
  --font-size-4xl: 2.25rem;
  --font-size-5xl: 3rem;
  --font-size-6xl: 3.75rem;

  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  --spacing-3xl: 4rem;
  --spacing-4xl: 6rem;

  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
  --radius-full: 9999px;

  /* 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: 0 0 30px var(--color-glow);

  /* Transitions */
  --transition-fast: 150ms ease-in-out;
  --transition-base: 300ms ease-in-out;
  --transition-slow: 500ms ease-in-out;

  /* Z-Index Scale */
  --z-dropdown: 1000;
  --z-sticky: 1020;
  --z-fixed: 1030;
  --z-modal: 1040;
  --z-popover: 1050;
  --z-tooltip: 1060;
}

:root[data-theme="light"] {
  /* Color Palette - Light Mode */
  --color-bg-primary: #f8fafc;
  --color-bg-secondary: #ffffff;
  --color-bg-card: rgba(255, 255, 255, 0.7);
  --color-bg-card-hover: rgba(255, 255, 255, 0.9);

  /* Text Colors - Light Mode */
  --color-text-primary: #0f172a;
  --color-text-secondary: #475569;
  --color-text-muted: #64748b;

  /* Border & Effects - Light Mode */
  --color-border: rgba(0, 0, 0, 0.1);
  --color-glow: rgba(99, 102, 241, 0.15);
  --color-bg-nav: rgba(255, 255, 255, 0.8);

  --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);
}

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

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

body {
  font-family: var(--font-body);
  background: transparent;
  color: var(--color-text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  position: relative;
}

/* Animated background gradient */
body::before {
  content: '';
  position: fixed;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle at 20% 30%, rgba(99, 102, 241, 0.1) 0%, transparent 50%),
    radial-gradient(circle at 80% 70%, rgba(139, 92, 246, 0.1) 0%, transparent 50%),
    radial-gradient(circle at 40% 80%, rgba(6, 182, 212, 0.05) 0%, transparent 50%);
  animation: gradientShift 20s ease infinite;
  z-index: -1;
  pointer-events: none;
}

@keyframes gradientShift {

  0%,
  100% {
    transform: translate(0, 0) rotate(0deg);
  }

  33% {
    transform: translate(5%, 5%) rotate(120deg);
  }

  66% {
    transform: translate(-5%, 5%) rotate(240deg);
  }
}

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

h1 {
  font-size: var(--font-size-5xl);
}

h2 {
  font-size: var(--font-size-4xl);
}

h3 {
  font-size: var(--font-size-3xl);
}

h4 {
  font-size: var(--font-size-2xl);
}

h5 {
  font-size: var(--font-size-xl);
}

h6 {
  font-size: var(--font-size-lg);
}

p {
  margin-bottom: var(--spacing-md);
  color: var(--color-text-secondary);
}

a {
  color: var(--color-accent-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-accent-secondary);
}

/* ============================================
   LAYOUT UTILITIES
   ============================================ */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-xl);
}

.section {
  padding: var(--spacing-4xl) 0;
  position: relative;
}

.section-title {
  text-align: center;
  margin-bottom: var(--spacing-3xl);
  position: relative;
}

.section-title h2 {
  display: inline-block;
  background: linear-gradient(135deg, var(--color-accent-primary), var(--color-accent-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: var(--spacing-md);
}

.section-title::after {
  content: '';
  display: block;
  width: 60px;
  height: 4px;
  background: linear-gradient(90deg, var(--color-accent-primary), var(--color-accent-secondary));
  margin: var(--spacing-md) auto 0;
  border-radius: var(--radius-full);
}

/* ============================================
   NAVIGATION
   ============================================ */
/* ============================================
   NAVIGATION
   ============================================ */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: var(--color-bg-nav, rgba(10, 10, 15, 0.8));
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--color-border);
  padding: var(--spacing-lg) 0;
  z-index: var(--z-fixed);
  transition: all var(--transition-base);
}

.navbar.scrolled {
  padding: var(--spacing-md) 0;
  box-shadow: var(--shadow-lg);
}

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

.nav-logo {
  font-family: var(--font-heading);
  font-size: var(--font-size-xl);
  font-weight: 700;
  background: linear-gradient(135deg, var(--color-accent-primary), var(--color-accent-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav-menu {
  display: flex;
  gap: var(--spacing-xl);
  list-style: none;
}

.nav-link {
  color: var(--color-text-secondary);
  font-weight: 500;
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  position: relative;
}

.nav-link:hover,
.nav-link.active {
  color: var(--color-text-primary);
  background: var(--color-bg-card);
}

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 30px;
  height: 2px;
  background: linear-gradient(90deg, var(--color-accent-primary), var(--color-accent-secondary));
  border-radius: var(--radius-full);
}

.theme-toggle {
  background: none;
  border: 1px solid var(--color-border);
  border-radius: 50%;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--color-text-primary);
  font-size: 1.2rem;
  transition: all var(--transition-fast);
}

.theme-toggle:hover {
  background: var(--color-bg-card);
  border-color: var(--color-accent-primary);
  transform: rotate(15deg);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 4px;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--spacing-sm);
}

.nav-toggle span {
  display: block;
  width: 25px;
  height: 2px;
  background: var(--color-text-primary);
  transition: all var(--transition-fast);
}

/* ============================================
   HERO SECTION
   ============================================ */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  position: relative;
  padding-top: 80px;
}

.hero-content {
  opacity: 0;
  animation: fadeInUp 1s ease forwards;
  animation-delay: 0.2s;
}

.hero-greeting {
  font-size: var(--font-size-lg);
  color: var(--color-accent-primary);
  margin-bottom: var(--spacing-md);
  font-weight: 500;
}

.hero-title {
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  margin-bottom: var(--spacing-lg);
  line-height: 1.1;
}

.hero-title .gradient-text {
  background: linear-gradient(135deg, var(--color-accent-primary), var(--color-accent-secondary), var(--color-accent-tertiary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: var(--font-size-xl);
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-2xl);
  max-width: 700px;
  margin-left: auto;
  margin-right: auto;
}

.hero-cta {
  display: flex;
  gap: var(--spacing-lg);
  justify-content: center;
  flex-wrap: wrap;
}

/* ============================================
   BUTTONS
   ============================================ */
.btn {
  padding: var(--spacing-md) var(--spacing-xl);
  border-radius: var(--radius-lg);
  font-weight: 600;
  font-size: var(--font-size-base);
  cursor: pointer;
  transition: all var(--transition-base);
  border: none;
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  text-decoration: none;
  position: relative;
  overflow: hidden;
}

.btn::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.1);
  transform: translate(-50%, -50%);
  transition: width var(--transition-slow), height var(--transition-slow);
}

.btn:hover::before {
  width: 300px;
  height: 300px;
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-accent-primary), var(--color-accent-secondary));
  color: white;
  box-shadow: 0 4px 15px rgba(99, 102, 241, 0.4);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(99, 102, 241, 0.6);
}

.btn-secondary {
  background: var(--color-bg-card);
  color: var(--color-text-primary);
  border: 1px solid var(--color-border);
  backdrop-filter: blur(10px);
}

.btn-secondary:hover {
  background: var(--color-bg-card-hover);
  border-color: var(--color-accent-primary);
  transform: translateY(-2px);
}

/* ============================================
   CARDS
   ============================================ */
.card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--spacing-xl);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-accent-primary), var(--color-accent-secondary), var(--color-accent-tertiary));
  opacity: 0;
  transition: opacity var(--transition-base);
}

.card:hover {
  background: var(--color-bg-card-hover);
  border-color: var(--color-accent-primary);
  transform: translateY(-5px);
  box-shadow: var(--shadow-xl), 0 10px 30px rgba(99, 102, 241, 0.2);
}

.card:hover::before {
  opacity: 1;
}

/* ============================================
   GRID LAYOUTS
   ============================================ */
.grid {
  display: grid;
  gap: var(--spacing-xl);
}

.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(200px, 1fr));
}

/* ============================================
   BADGES & TAGS
   ============================================ */
.badge {
  display: inline-block;
  padding: var(--spacing-xs) var(--spacing-md);
  border-radius: var(--radius-full);
  font-size: var(--font-size-sm);
  font-weight: 600;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  color: var(--color-text-primary);
  transition: all var(--transition-fast);
}

.badge:hover {
  background: var(--color-accent-primary);
  border-color: var(--color-accent-primary);
  transform: translateY(-2px);
  box-shadow: 0 4px 10px rgba(99, 102, 241, 0.3);
}

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
}

/* ============================================
   SKILLS SECTION
   ============================================ */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-xl);
}

.skill-category {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--spacing-xl);
  backdrop-filter: blur(10px);
}

.skill-category h3 {
  font-size: var(--font-size-xl);
  margin-bottom: var(--spacing-lg);
  color: var(--color-accent-primary);
}

.skill-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
}

/* ============================================
   TIMELINE
   ============================================ */
.timeline {
  position: relative;
  padding-left: var(--spacing-2xl);
}

.timeline::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(180deg, var(--color-accent-primary), var(--color-accent-secondary));
}

.timeline-item {
  position: relative;
  margin-bottom: var(--spacing-2xl);
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: calc(-1 * var(--spacing-2xl) - 6px);
  top: 0;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--color-accent-primary);
  border: 3px solid var(--color-bg-primary);
  box-shadow: 0 0 0 4px var(--color-bg-card);
}

.timeline-content {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  backdrop-filter: blur(10px);
  transition: all var(--transition-base);
}

.timeline-content:hover {
  border-color: var(--color-accent-primary);
  transform: translateX(5px);
}

.timeline-date {
  color: var(--color-accent-tertiary);
  font-size: var(--font-size-sm);
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
}

.timeline-title {
  font-size: var(--font-size-lg);
  margin-bottom: var(--spacing-xs);
}

.timeline-subtitle {
  color: var(--color-text-muted);
  margin-bottom: var(--spacing-md);
  font-size: var(--font-size-sm);
}

/* ============================================
   PROJECT CARDS
   ============================================ */
.project-card {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-xl);
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  transition: all var(--transition-base);
}

.project-card:hover {
  transform: translateY(-10px);
  box-shadow: var(--shadow-xl), 0 15px 40px rgba(99, 102, 241, 0.3);
  border-color: var(--color-accent-primary);
}

.project-image {
  width: 100%;
  height: 200px;
  background-color: var(--color-bg-card);
  /* Fallback color */
  background-position: center;
  background-size: cover;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-4xl);
  overflow: hidden;
  /* Ensure image doesn't overflow */
}

.project-content {
  padding: var(--spacing-xl);
}

.project-title {
  font-size: var(--font-size-xl);
  margin-bottom: var(--spacing-md);
}

.project-description {
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-lg);
  line-height: 1.6;
}

.project-tech {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-lg);
}

.project-links {
  display: flex;
  gap: var(--spacing-md);
}

.project-link {
  padding: var(--spacing-sm) var(--spacing-lg);
  border-radius: var(--radius-md);
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  color: var(--color-text-primary);
  font-size: var(--font-size-sm);
  font-weight: 600;
  transition: all var(--transition-fast);
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.project-link:hover {
  background: var(--color-accent-primary);
  border-color: var(--color-accent-primary);
  color: white;
  transform: translateY(-2px);
}

/* ============================================
   CONTACT SECTION
   ============================================ */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-xl);
  margin-top: var(--spacing-2xl);
}

.contact-item {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
  text-align: center;
  transition: all var(--transition-base);
  backdrop-filter: blur(10px);
}

.contact-item:hover {
  border-color: var(--color-accent-primary);
  transform: translateY(-5px);
  box-shadow: 0 10px 30px rgba(99, 102, 241, 0.2);
}

.contact-icon {
  font-size: var(--font-size-3xl);
  margin-bottom: var(--spacing-md);
  color: var(--color-accent-primary);
}

.social-links {
  display: flex;
  justify-content: center;
  gap: var(--spacing-lg);
  margin-top: var(--spacing-2xl);
}

.social-link {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-xl);
  transition: all var(--transition-base);
}

.social-link:hover {
  background: var(--color-accent-primary);
  border-color: var(--color-accent-primary);
  color: white;
  transform: translateY(-5px) rotate(360deg);
  box-shadow: 0 5px 15px rgba(99, 102, 241, 0.4);
}

/* ============================================
   FOOTER
   ============================================ */
.footer {
  background: var(--color-bg-secondary);
  border-top: 1px solid var(--color-border);
  padding: var(--spacing-2xl) 0;
  text-align: center;
}

.footer-content {
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
}

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

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }

  to {
    opacity: 1;
  }
}

.fade-in-up {
  opacity: 0;
  animation: fadeInUp 0.8s ease forwards;
}

.fade-in {
  opacity: 0;
  animation: fadeIn 0.8s ease forwards;
}

/* Stagger delay for multiple elements */
.stagger-1 {
  animation-delay: 0.1s;
}

.stagger-2 {
  animation-delay: 0.2s;
}

.stagger-3 {
  animation-delay: 0.3s;
}

.stagger-4 {
  animation-delay: 0.4s;
}

.stagger-5 {
  animation-delay: 0.5s;
}

/* ============================================
   RESPONSIVE DESIGN
   ============================================ */
@media (max-width: 768px) {
  html {
    font-size: 14px;
  }

  .nav-menu {
    position: fixed;
    top: 70px;
    left: 0;
    right: 0;
    background: rgba(10, 10, 15, 0.95);
    backdrop-filter: blur(20px);
    flex-direction: column;
    padding: var(--spacing-xl);
    border-bottom: 1px solid var(--color-border);
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: all var(--transition-base);
    gap: var(--spacing-md);
    z-index: calc(var(--z-fixed) - 1);
  }

  .nav-menu.active {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
  }

  .nav-toggle {
    display: flex;
  }

  .nav-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
  }

  .nav-toggle.active span:nth-child(2) {
    opacity: 0;
  }

  .nav-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -6px);
  }

  .hero {
    min-height: 80vh;
  }

  .hero-cta {
    flex-direction: column;
    align-items: stretch;
  }

  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }

  .timeline {
    padding-left: var(--spacing-lg);
  }

  .timeline-item::before {
    left: calc(-1 * var(--spacing-lg) - 6px);
  }

  .section {
    padding: var(--spacing-2xl) 0;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 var(--spacing-md);
  }

  .card {
    padding: var(--spacing-md);
  }
}

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

.text-left {
  text-align: left;
}

.text-right {
  text-align: right;
}

.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);
}

.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);
}

.hidden {
  display: none;
}

.visible {
  display: block;
}

/* Scroll reveal animation trigger */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.8s ease;
}

.reveal.active {
  opacity: 1;
  transform: translateY(0);
}

/* ============================================
   MODAL STYLES
   ============================================ */
/* ============================================
   GLOBAL STYLES (Refreshed)
   ============================================ */
.modal {
  display: none;
  position: fixed;
  z-index: var(--z-modal);
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  overflow: auto;
  background-color: rgba(0, 0, 0, 0.8);
  backdrop-filter: blur(5px);
  -webkit-backdrop-filter: blur(5px);
  animation: fadeIn var(--transition-base);
}

.modal-content {
  background-color: var(--color-bg-secondary);
  margin: 10% auto;
  padding: var(--spacing-xl);
  border: 1px solid var(--color-border);
  width: 90%;
  max-width: 700px;
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
  position: relative;
  animation: slideUp var(--transition-base);
}

.close-modal {
  color: var(--color-text-secondary);
  float: right;
  font-size: 2rem;
  font-weight: bold;
  cursor: pointer;
  line-height: 1;
  transition: color var(--transition-fast);
}

.close-modal:hover,
.close-modal:focus {
  color: var(--color-accent-primary);
  text-decoration: none;
  cursor: pointer;
}

.modal-header {
  margin-bottom: var(--spacing-lg);
  padding-bottom: var(--spacing-md);
  border-bottom: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.modal-icon {
  font-size: 2.5rem;
}

.modal-body {
  line-height: 1.8;
}

.modal-tech-stack {
  margin-top: var(--spacing-lg);
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
}

.modal-trigger {
  cursor: pointer;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.modal-trigger:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }

  to {
    opacity: 1;
  }
}

@keyframes slideUp {
  from {
    transform: translateY(50px);
    opacity: 0;
  }

  to {
    transform: translateY(0);
    opacity: 1;
  }
}

.btn-text {
  background: none;
  border: none;
  color: var(--color-accent-primary);
  font-weight: 600;
  cursor: pointer;
  padding: 0;
  margin-top: var(--spacing-md);
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 1rem;
}

/* ============================================
   ROADMAP TIMELINE STYLES
   ============================================ */
/* ============================================
   ROADMAP TIMELINE STYLES
   ============================================ */
.roadmap-timeline {
  position: relative;
  max-width: 1000px;
  margin: 0 auto;
  padding: var(--spacing-xl) 0;
}

/* Base styles (Mobile/Tablets) - Stacked Layout */
.roadmap-timeline::before {
  content: '';
  position: absolute;
  top: 0;
  bottom: 0;
  left: 20px;
  /* Line on left */
  width: 4px;
  background: var(--color-border);
  border-radius: var(--radius-full);
}

.roadmap-item {
  position: relative;
  width: 100%;
  padding-left: 60px;
  /* Space for line */
  padding-right: 0;
  margin-bottom: var(--spacing-2xl);
  text-align: left;
}

.roadmap-item::after {
  content: '';
  position: absolute;
  left: 10px;
  /* Centered on line (20px line, so 10px offset for 20px dot? No. Line left is 20px. Line center is 22px. Dot is 20px wide. Left should be 12px.) */
  left: 12px;
  top: 0;
  width: 20px;
  height: 20px;
  background: var(--color-bg-secondary);
  border: 4px solid var(--color-accent-primary);
  border-radius: 50%;
  z-index: 1;
  transition: all var(--transition-base);
}

.roadmap-item:hover::after {
  background: var(--color-accent-primary);
  border-color: var(--color-accent-secondary);
  transform: scale(1.3);
  box-shadow: 0 0 15px var(--color-accent-primary);
}

.roadmap-content {
  background: var(--color-bg-card);
  padding: var(--spacing-lg);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  transition: all var(--transition-base);
  position: relative;
}

.roadmap-content:hover {
  transform: translateY(-5px);
  border-color: var(--color-accent-primary);
  box-shadow: var(--shadow-lg);
}

/* Desktop Styles (Alternating Layout) */
@media (min-width: 768px) {
  .roadmap-timeline::before {
    left: 50%;
    transform: translateX(-50%);
  }

  .roadmap-item {
    width: 50%;
    padding-left: 0;
  }

  /* Odd items: Left side */
  .roadmap-item:nth-child(odd) {
    left: 0;
    text-align: right;
    padding-right: 50px;
    /* Gap for line */
  }

  .roadmap-item:nth-child(odd)::after {
    left: auto;
    right: -10px;
    /* Center on line */
  }

  /* Even items: Right side */
  .roadmap-item:nth-child(even) {
    left: 50%;
    text-align: left;
    padding-left: 50px;
  }

  .roadmap-item:nth-child(even)::after {
    left: -10px;
  }
}

.roadmap-date {
  font-family: var(--font-heading);
  color: var(--color-accent-primary);
  font-weight: 700;
  margin-bottom: var(--spacing-xs);
  display: block;
}

.roadmap-title {
  font-size: var(--font-size-lg);
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-xs);
}

.roadmap-subtitle {
  font-size: var(--font-size-base);
  color: var(--color-text-secondary);
  font-style: italic;
  margin-bottom: var(--spacing-sm);
}

/* ============================================
   PUBLICATIONS SECTION
   ============================================ */
.publications-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-xl);
  margin-top: var(--spacing-xl);
}

.publication-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
  position: relative;
  transition: all var(--transition-base);
  height: 100%;
  display: flex;
  flex-direction: column;
}

.publication-card:hover {
  transform: translateY(-5px);
  border-color: var(--color-accent-primary);
  box-shadow: var(--shadow-lg);
}

.pub-icon {
  font-size: 2rem;
  margin-bottom: var(--spacing-md);
}

.pub-title {
  font-size: var(--font-size-lg);
  font-weight: 700;
  margin-bottom: var(--spacing-sm);
  color: var(--color-accent-primary);
  line-height: 1.4;
}

.pub-meta {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  margin-bottom: var(--spacing-md);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.pub-authors {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-bottom: var(--spacing-lg);
  flex-grow: 1;
}

.pub-actions {
  margin-top: auto;
}

/* ============================================
   SKILLS SECTION (NEW)
   ============================================ */
.skills-grid-new {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: var(--spacing-xl);
}

.skill-category-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
  transition: all var(--transition-base);
}

.skill-category-card:hover {
  transform: translateY(-5px);
  border-color: var(--color-accent-primary);
  box-shadow: var(--shadow-lg);
}

.category-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: var(--spacing-lg);
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 1rem;
}

.category-icon {
  font-size: 1.5rem;
}

.skill-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.skill-badge-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  background: rgba(255, 255, 255, 0.05);
  padding: 0.5rem 1rem;
  border-radius: var(--radius-full);
  border: 1px solid var(--color-border);
  transition: all 0.3s ease;
}

.skill-badge-item:hover {
  background: rgba(99, 102, 241, 0.1);
  border-color: var(--color-accent-primary);
  transform: scale(1.05);
}

.skill-dot {
  width: 8px;
  height: 8px;
  background: var(--color-accent-primary);
  border-radius: 50%;
  box-shadow: 0 0 8px var(--color-accent-primary);
}

/* ============================================
   CONTACT SECTION (NEW)
   ============================================ */
.contact-split-grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: var(--spacing-2xl);
  margin-top: var(--spacing-xl);
}

@media (max-width: 992px) {
  .contact-split-grid {
    grid-template-columns: 1fr;
  }
}

.contact-info-card {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  padding: var(--spacing-lg);
  border-radius: var(--radius-lg);
  margin-bottom: var(--spacing-md);
  transition: all var(--transition-base);
}

.contact-info-card:hover {
  border-color: var(--color-accent-primary);
  transform: translateX(10px);
  box-shadow: var(--shadow-md);
}

.info-icon {
  font-size: 2rem;
  width: 60px;
  height: 60px;
  background: rgba(99, 102, 241, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-lg);
}

.info-content {
  display: flex;
  flex-direction: column;
}

.info-label {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 1px;
}

.info-value {
  font-weight: 600;
  color: var(--color-text-primary);
  text-decoration: none;
  font-size: var(--font-size-base);
}

.premium-form {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  padding: var(--spacing-xl);
  border-radius: var(--radius-lg);
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-md);
}

@media (max-width: 576px) {
  .form-row {
    grid-template-columns: 1fr;
  }
}

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

.form-control {
  width: 100%;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--color-border);
  padding: 0.75rem 1rem;
  border-radius: var(--radius-md);
  color: var(--color-text-primary);
  font-family: var(--font-body);
  transition: all 0.3s ease;
}

.form-control:focus {
  outline: none;
  border-color: var(--color-accent-primary);
  background: rgba(255, 255, 255, 0.08);
  box-shadow: 0 0 10px rgba(99, 102, 241, 0.2);
}

.social-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 45px;
  height: 45px;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text-secondary);
  margin-right: 0.75rem;
  transition: all 0.3s ease;
}

.social-link:hover {
  color: var(--color-accent-primary);
  border-color: var(--color-accent-primary);
  transform: translateY(-3px);
  background: rgba(99, 102, 241, 0.1);
}

.alert {
  padding: 1rem;
  border-radius: var(--radius-md);
  margin-bottom: 1.5rem;
}

.alert-success {
  background: rgba(16, 185, 129, 0.1);
  border: 1px solid var(--color-accent-success);
  color: var(--color-accent-success);
}