/* ==========================================================================
   JAKARIA SAIKAT DHROBO - PREMIUM PORTFOLIO
   Custom CSS Variables & Base Styles
   ========================================================================== */

:root {
  /* Colors */
  --primary: #0B77FF;
  --primary-light: #3D93FF;
  --primary-dark: #0056CC;
  --secondary: #6B7CFF;
  --accent: #00C2FF;
  
  /* Neutrals */
  --white: #FFFFFF;
  --gray-50: #F9FAFB;
  --gray-100: #F3F4F6;
  --gray-200: #E5E7EB;
  --gray-300: #D1D5DB;
  --gray-400: #9CA3AF;
  --gray-500: #6B7280;
  --gray-600: #4B5563;
  --gray-700: #374151;
  --gray-800: #1F2937;
  --gray-900: #111827;
  
  /* Dark mode */
  --dark-bg: #0A0E27;
  --dark-surface: #141B3A;
  --dark-border: #1E2749;
  
  /* Gradients */
  --gradient-primary: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  --gradient-accent: linear-gradient(135deg, var(--accent) 0%, var(--primary) 100%);
  --gradient-surface: linear-gradient(180deg, rgba(11, 119, 255, 0.05) 0%, rgba(107, 124, 255, 0.05) 100%);
  
  /* Typography */
  --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-display: 'Manrope', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  
  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-2xl: 4rem;
  --spacing-3xl: 6rem;
  
  /* Layout */
  --container-width: 1200px;
  --border-radius: 12px;
  --border-radius-lg: 20px;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  --shadow-xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
  --shadow-glow: 0 0 30px rgba(11, 119, 255, 0.3);
  
  /* Transitions */
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-fast: all 0.15s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ==========================================================================
   RESET & BASE
   ========================================================================== */

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

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

body {
  font-family: var(--font-primary);
  font-size: 16px;
  line-height: 1.6;
  color: var(--gray-700);
  background-color: var(--gray-50);
  overflow-x: hidden;
}

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

a {
  text-decoration: none;
  color: inherit;
  transition: var(--transition);
}

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

ul, ol {
  list-style: none;
}

/* ==========================================================================
   TYPOGRAPHY
   ========================================================================== */

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.2;
  color: var(--gray-900);
}

h1 { font-size: clamp(2.5rem, 5vw, 4rem); }
h2 { font-size: clamp(2rem, 4vw, 3rem); }
h3 { font-size: clamp(1.5rem, 3vw, 2rem); }
h4 { font-size: clamp(1.25rem, 2.5vw, 1.5rem); }

p {
  margin-bottom: 1rem;
}

/* ==========================================================================
   UTILITIES
   ========================================================================== */

.container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

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

.section-dark {
  background: linear-gradient(180deg, var(--dark-bg) 0%, #0D1430 100%);
  color: var(--gray-100);
}

.section-dark h1,
.section-dark h2,
.section-dark h3,
.section-dark h4 {
  color: var(--white);
}

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

.section-label {
  display: inline-block;
  font-size: 0.875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--primary);
  margin-bottom: var(--spacing-sm);
}

.section-title {
  margin-bottom: var(--spacing-md);
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.section-dark .section-title {
  background: linear-gradient(135deg, var(--white) 0%, var(--gray-300) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.section-subtitle {
  font-size: 1.125rem;
  color: var(--gray-600);
  max-width: 600px;
  margin: 0 auto;
}

.section-dark .section-subtitle {
  color: var(--gray-400);
}

/* ==========================================================================
   BUTTONS
   ========================================================================== */

.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: 0.875rem 1.75rem;
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--border-radius);
  transition: var(--transition);
  cursor: pointer;
  white-space: nowrap;
}

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

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

.btn-secondary {
  background: var(--gray-100);
  color: var(--gray-900);
}

.btn-secondary:hover {
  background: var(--gray-200);
  transform: translateY(-2px);
}

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

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

.btn-ghost {
  color: var(--gray-700);
  background: rgba(255, 255, 255, 0.6);
  backdrop-filter: blur(10px);
  border: 1px solid var(--gray-200);
}

.btn-ghost:hover {
  color: var(--primary);
  border-color: var(--primary);
  background: rgba(11, 119, 255, 0.08);
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}

.btn-ghost::after {
  content: "→";
  margin-left: 6px;
  transition: var(--transition);
}

.btn-ghost:hover::after {
  transform: translateX(4px);
}

/* ==========================================================================
   NAVIGATION
   ========================================================================== */

.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  transition: var(--transition);
}

.nav.scrolled {
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(20px);
  box-shadow: var(--shadow);
}

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

.nav-logo {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 800;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
}

.nav-link {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--gray-700);
  position: relative;
  transition: var(--transition);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--gradient-primary);
  transition: var(--transition);
}

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

.nav-link:hover::after,
.nav-link.active::after {
  width: 100%;
}

.nav-link-cta {
  padding: 0.5rem 1.25rem;
  background: var(--gradient-primary);
  color: var(--white);
  border-radius: var(--border-radius);
}

.nav-link-cta::after {
  display: none;
}

.nav-link-cta:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 4px;
  padding: 0.5rem;
  cursor: pointer;
}

.nav-toggle-icon {
  width: 24px;
  height: 2px;
  background: var(--gray-900);
  transition: var(--transition);
}

/* ==========================================================================
   HERO SECTION
   ========================================================================== */

.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  padding: var(--spacing-3xl) 0;
  overflow: hidden;
}

.hero-background {
  position: absolute;
  inset: 0;
  z-index: -1;
}

.hero-gradient {
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at top, rgba(11, 119, 255, 0.15) 0%, transparent 60%),
              radial-gradient(ellipse at bottom right, rgba(107, 124, 255, 0.1) 0%, transparent 50%);
}

.hero-grid {
  position: absolute;
  inset: 0;
  background-image: 
    linear-gradient(rgba(11, 119, 255, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(11, 119, 255, 0.03) 1px, transparent 1px);
  background-size: 40px 40px;
}

.hero-content {
  text-align: center;
}

.hero-image-wrapper {
  position: relative;
  width: 180px;
  height: 180px;
  margin: 0 auto var(--spacing-xl);
}

.hero-image-ring {
  position: absolute;
  inset: -8px;
  border-radius: 50%;
  background: var(--gradient-primary);
  opacity: 0.2;
  animation: pulse 3s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% {
    transform: scale(1);
    opacity: 0.2;
  }
  50% {
    transform: scale(1.1);
    opacity: 0.3;
  }
}

.hero-image {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  object-fit: cover;
  border: 4px solid var(--white);
  box-shadow: var(--shadow-xl);
}

.hero-greeting {
  font-size: 1.125rem;
  font-weight: 500;
  color: var(--primary);
  margin-bottom: var(--spacing-sm);
}

.hero-name {
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  font-weight: 800;
  margin-bottom: var(--spacing-md);
  background: linear-gradient(135deg, var(--gray-900) 0%, var(--gray-600) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-title-static {
  display: block;
  font-size: clamp(1rem, 2vw, 1.25rem);
  color: var(--gray-600);
  margin-bottom: var(--spacing-md);
}

.hero-rotating {
  height: 40px;
  margin-bottom: var(--spacing-lg);
}

.hero-rotating-text {
  position: relative;
  display: inline-block;
  height: 40px;
}

.rotate-word {
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  font-size: 1.5rem;
  font-weight: 700;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  opacity: 0;
  transition: opacity 0.5s ease-in-out;
  white-space: nowrap;
}

.rotate-word.active {
  opacity: 1;
}

.hero-description {
  font-size: 1.125rem;
  color: var(--gray-600);
  max-width: 600px;
  margin: 0 auto var(--spacing-xl);
  line-height: 1.8;
}

.hero-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-md);
  justify-content: center;
  margin-bottom: var(--spacing-xl);
}

.hero-social {
  display: flex;
  gap: var(--spacing-md);
  justify-content: center;
}

.social-link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--gray-100);
  color: var(--gray-700);
  transition: var(--transition);
}

.social-link:hover {
  background: var(--gradient-primary);
  color: var(--white);
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.scroll-indicator {
  position: absolute;
  bottom: var(--spacing-xl);
  left: 50%;
  transform: translateX(-50%);
}

.scroll-mouse {
  width: 24px;
  height: 40px;
  border: 2px solid var(--gray-400);
  border-radius: 12px;
  position: relative;
}

.scroll-wheel {
  width: 4px;
  height: 8px;
  background: var(--gray-400);
  border-radius: 2px;
  position: absolute;
  top: 8px;
  left: 50%;
  transform: translateX(-50%);
  animation: scroll 2s ease-in-out infinite;
}

@keyframes scroll {
  0% {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
  }
  100% {
    opacity: 0;
    transform: translateX(-50%) translateY(16px);
  }
}

/* ==========================================================================
   ABOUT SECTION
   ========================================================================== */

.about-content {
  display: grid;
  gap: var(--spacing-2xl);
}

.about-text {
  max-width: 800px;
  margin: 0 auto;
}

.about-paragraph {
  font-size: 1.0625rem;
  line-height: 1.8;
  color: var(--gray-600);
  margin-bottom: var(--spacing-lg);
}

.about-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-lg);
}

.about-card {
  background: var(--white);
  padding: var(--spacing-xl);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow);
  transition: var(--transition);
  border: 1px solid var(--gray-200);
}

.about-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-xl);
  border-color: var(--primary);
}

.about-card-icon {
  width: 64px;
  height: 64px;
  background: var(--gradient-surface);
  border-radius: var(--border-radius);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--spacing-md);
  color: var(--primary);
}

.about-card-title {
  font-size: 1.25rem;
  margin-bottom: var(--spacing-sm);
  color: var(--gray-900);
}

.about-card-text {
  color: var(--gray-600);
  line-height: 1.7;
}

/* ==========================================================================
   EXPERIENCE SECTION
   ========================================================================== */

.timeline {
  position: relative;
  max-width: 900px;
  margin: 0 auto;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 20px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(180deg, var(--primary) 0%, var(--secondary) 100%);
}

.timeline-item {
  position: relative;
  padding-left: 60px;
  margin-bottom: var(--spacing-2xl);
}

.timeline-marker {
  position: absolute;
  left: 12px;
  top: 24px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--primary);
  border: 4px solid var(--dark-bg);
  box-shadow: 0 0 0 4px rgba(11, 119, 255, 0.2);
  z-index: 1;
}

.experience-card {
  background: rgba(255, 255, 255, 0.05);
  backdrop-filter: blur(20px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-xl);
  transition: var(--transition);
}

.experience-card:hover {
  transform: translateX(8px);
  border-color: var(--primary);
  box-shadow: var(--shadow-xl);
}

.experience-header {
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
  flex-wrap: wrap;
}

.experience-logo {
  width: 60px;
  height: 60px;
  object-fit: contain;
  border-radius: var(--border-radius);
  background: var(--white);
  padding: 8px;
}

.experience-info {
  flex: 1;
  min-width: 200px;
}

.experience-title {
  font-size: 1.25rem;
  color: var(--white);
  margin-bottom: var(--spacing-xs);
}

.experience-company {
  color: var(--gray-300);
  margin-bottom: 4px;
}

.experience-duration {
  font-size: 0.875rem;
  color: var(--gray-400);
}

.experience-tag {
  padding: 0.375rem 0.875rem;
  border-radius: 20px;
  font-size: 0.875rem;
  font-weight: 600;
  white-space: nowrap;
}

.tag-ai {
  background: linear-gradient(135deg, rgba(11, 119, 255, 0.2) 0%, rgba(107, 124, 255, 0.2) 100%);
  color: var(--accent);
  border: 1px solid rgba(11, 119, 255, 0.3);
}

.tag-research {
  background: linear-gradient(135deg, rgba(107, 124, 255, 0.2) 0%, rgba(11, 119, 255, 0.2) 100%);
  color: var(--secondary);
  border: 1px solid rgba(107, 124, 255, 0.3);
}

.tag-publication {
  background: linear-gradient(135deg, rgba(0, 194, 255, 0.2) 0%, rgba(11, 119, 255, 0.2) 100%);
  color: var(--accent);
  border: 1px solid rgba(0, 194, 255, 0.3);
}

.tag-marketing {
  background: linear-gradient(135deg, rgba(255, 107, 107, 0.2) 0%, rgba(255, 142, 83, 0.2) 100%);
  color: #FF8E53;
  border: 1px solid rgba(255, 107, 107, 0.3);
}

.experience-description {
  color: var(--gray-300);
  line-height: 1.8;
  margin-bottom: var(--spacing-lg);
}

.experience-media {
  margin: var(--spacing-lg) 0;
}

.experience-image {
  width: 100%;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-lg);
}

.experience-team {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-md);
  margin: var(--spacing-lg) 0;
}

.team-member {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-md);
  background: rgba(255, 255, 255, 0.03);
  border-radius: var(--border-radius);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.team-photo {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  object-fit: cover;
  border: 2px solid var(--primary);
}

.team-name {
  font-weight: 600;
  color: var(--white);
  font-size: 0.9375rem;
}

.team-role {
  font-size: 0.8125rem;
  color: var(--gray-400);
}

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

.skill-chip {
  padding: 0.5rem 1rem;
  background: rgba(11, 119, 255, 0.1);
  border: 1px solid rgba(11, 119, 255, 0.2);
  border-radius: 20px;
  font-size: 0.875rem;
  color: var(--accent);
  font-weight: 500;
}

/* ==========================================================================
   RESEARCH SECTION
   ========================================================================== */

.research-featured {
  max-width: 1000px;
  margin: 0 auto;
}

.research-card-large {
  background: var(--white);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-xl);
  overflow: hidden;
  border: 1px solid var(--gray-200);
  transition: var(--transition);
}

.research-card-large:hover {
  transform: translateY(-8px);
  box-shadow: 0 30px 60px -12px rgba(0, 0, 0, 0.25);
}

.research-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-md) var(--spacing-lg);
  background: var(--gradient-primary);
  color: var(--white);
  font-weight: 700;
  font-size: 1.125rem;
  letter-spacing: 0.5px;
}

.research-content-wrapper {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-2xl);
  padding: var(--spacing-2xl);
}

.research-paper-title {
  font-size: 1.75rem;
  line-height: 1.3;
  margin-bottom: var(--spacing-lg);
  color: var(--gray-900);
}

.research-meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
}

.research-meta-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  font-size: 0.9375rem;
  color: var(--gray-600);
}

.research-abstract h4,
.research-highlights h4 {
  font-size: 1.125rem;
  color: var(--gray-900);
  margin-bottom: var(--spacing-sm);
}

.research-abstract {
  margin-bottom: var(--spacing-lg);
}

.research-abstract p {
  color: var(--gray-600);
  line-height: 1.8;
}

.research-highlights-list {
  list-style: none;
  margin-bottom: var(--spacing-lg);
}

.research-highlights-list li {
  position: relative;
  padding-left: var(--spacing-lg);
  margin-bottom: var(--spacing-sm);
  color: var(--gray-600);
}

.research-highlights-list li::before {
  content: '→';
  position: absolute;
  left: 0;
  color: var(--primary);
  font-weight: 700;
}

.research-btn {
  margin-top: var(--spacing-md);
}

.research-visual-content{
    display:flex;
    align-items:center;
    justify-content:center;
}

.research-image-wrapper{
    width:100%;
    max-width:420px;
}

.research-image{
    width:100%;
    height:auto;
    display:block;
    border-radius:var(--border-radius);
}

.research-overlay {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: var(--spacing-md);
  background: linear-gradient(to top, rgba(0, 0, 0, 0.8), transparent);
}

.research-overlay-text {
  color: var(--white);
  font-weight: 600;
  font-size: 0.9375rem;
}

/* ==========================================================================
   PROJECTS SECTION
   ========================================================================== */

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
  gap: var(--spacing-xl);
}

.project-card {
  background: rgba(255, 255, 255, 0.05);
  backdrop-filter: blur(20px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--border-radius-lg);
  overflow: hidden;
  transition: var(--transition);
}

.project-card:hover {
  transform: translateY(-8px);
  border-color: var(--primary);
  box-shadow: var(--shadow-xl);
}

.project-image-link {
  display: block;
  position: relative;
  overflow: hidden;
}

.project-image-wrapper {
  position: relative;
  aspect-ratio: 16 / 9;
  overflow: hidden;
}

.project-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: var(--transition);
}

.project-image-link:hover .project-image {
  transform: scale(1.05);
}

.project-overlay {
  position: absolute;
  inset: 0;
  background: rgba(11, 119, 255, 0.95);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-md);
  opacity: 0;
  transition: var(--transition);
}

.project-image-link:hover .project-overlay {
  opacity: 1;
}

.project-overlay svg {
  color: var(--white);
}

.project-overlay-text {
  color: var(--white);
  font-weight: 600;
  font-size: 1.125rem;
}

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

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

.project-description {
  color: var(--gray-300);
  line-height: 1.7;
  margin-bottom: var(--spacing-lg);
}

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

.tech-tag {
  padding: 0.375rem 0.875rem;
  background: rgba(0, 194, 255, 0.1);
  border: 1px solid rgba(0, 194, 255, 0.2);
  border-radius: 20px;
  font-size: 0.8125rem;
  color: var(--accent);
  font-weight: 500;
}

.project-link {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  color: var(--primary);
  font-weight: 600;
  transition: var(--transition);
}

.project-link:hover {
  color: var(--accent);
  gap: var(--spacing-sm);
}

/* ==========================================================================
   EDUCATION SECTION
   ========================================================================== */

.education-timeline {
  max-width: 800px;
  margin: 0 auto;
}

.education-item {
  position: relative;
  padding-left: 60px;
  margin-bottom: var(--spacing-2xl);
}

.education-item::before {
  content: '';
  position: absolute;
  left: 20px;
  top: 40px;
  bottom: -40px;
  width: 2px;
  background: linear-gradient(180deg, var(--primary) 0%, transparent 100%);
}

.education-item:last-child::before {
  display: none;
}

.education-marker {
  position: absolute;
  left: 12px;
  top: 32px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--primary);
  border: 4px solid var(--gray-50);
  box-shadow: 0 0 0 4px rgba(11, 119, 255, 0.2);
  z-index: 1;
}

.education-card {
  background: var(--white);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-xl);
  box-shadow: var(--shadow);
  border: 1px solid var(--gray-200);
  transition: var(--transition);
  display: flex;
  gap: var(--spacing-lg);
  align-items: flex-start;
}

.education-card:hover {
  transform: translateX(8px);
  box-shadow: var(--shadow-xl);
  border-color: var(--primary);
}

.education-logo-wrapper {
  flex-shrink: 0;
}

.education-logo {
  width: 80px;
  height: 80px;
  object-fit: contain;
}

.education-logo-placeholder {
  width: 80px;
  height: 80px;
  background: var(--gradient-surface);
  border-radius: var(--border-radius);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary);
}

.education-content {
  flex: 1;
}

.education-degree {
  font-size: 1.25rem;
  margin-bottom: var(--spacing-xs);
  color: var(--gray-900);
}

.education-institution {
  color: var(--primary);
  font-weight: 600;
  margin-bottom: 4px;
}

.education-duration {
  color: var(--gray-500);
  font-size: 0.9375rem;
  margin-bottom: var(--spacing-md);
}

.education-achievements {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.achievement-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  color: var(--gray-600);
  font-size: 0.9375rem;
}

.achievement-item svg {
  color: var(--primary);
  flex-shrink: 0;
}

/* ==========================================================================
   CERTIFICATIONS SECTION
   ========================================================================== */

.certifications-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--spacing-xl);
}

.cert-card {
  background: rgba(255, 255, 255, 0.05);
  backdrop-filter: blur(20px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--border-radius-lg);
  overflow: hidden;
  transition: var(--transition);
  cursor: pointer;
}

.cert-card:hover {
  transform: translateY(-8px);
  border-color: var(--primary);
  box-shadow: var(--shadow-xl);
}

.cert-image-wrapper {
  position: relative;
  aspect-ratio: 16 / 11;
  overflow: hidden;
  background: var(--dark-surface);
}

.cert-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: var(--transition);
}

.cert-card:hover .cert-image {
  transform: scale(1.05);
}

.cert-overlay {
  position: absolute;
  inset: 0;
  background: rgba(11, 119, 255, 0.9);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  opacity: 0;
  transition: var(--transition);
}

.cert-card:hover .cert-overlay {
  opacity: 1;
}

.cert-overlay svg {
  color: var(--white);
}

.cert-overlay span {
  color: var(--white);
  font-weight: 600;
}

.cert-content {
  padding: var(--spacing-lg);
}

.cert-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-md);
}

.cert-issuer-text {
  font-weight: 700;
  color: var(--primary);
  font-size: 0.9375rem;
}

.cert-date {
  font-size: 0.875rem;
  color: var(--gray-400);
  font-weight: 600;
}

.cert-title {
  font-size: 1.125rem;
  color: var(--white);
  margin-bottom: var(--spacing-md);
  line-height: 1.4;
}

.cert-skills {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-xs);
}

.cert-skill {
  padding: 0.25rem 0.625rem;
  background: rgba(0, 194, 255, 0.1);
  border: 1px solid rgba(0, 194, 255, 0.2);
  border-radius: 12px;
  font-size: 0.75rem;
  color: var(--accent);
  font-weight: 500;
}

/* Certificate Modal */
.cert-modal {
  position: fixed;
  inset: 0;
  z-index: 2000;
  display: none;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-lg);
}

.cert-modal.active {
  display: flex;
}

.cert-modal-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.9);
  backdrop-filter: blur(10px);
}

.cert-modal-content {
  position: relative;
  max-width: 90%;
  max-height: 90%;
  z-index: 1;
}

.cert-modal-image {
  max-width: 100%;
  max-height: 85vh;
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-xl);
}

.cert-modal-close {
  position: absolute;
  top: -40px;
  right: 0;
  width: 40px;
  height: 40px;
  background: var(--white);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: var(--transition);
}

.cert-modal-close:hover {
  background: var(--primary);
  color: var(--white);
  transform: rotate(90deg);
}

/* ==========================================================================
   VOLUNTEER SECTION
   ========================================================================== */

.volunteer-showcase {
  max-width: 900px;
  margin: 0 auto;
}

.volunteer-card-large {
  background: var(--white);
  border-radius: var(--border-radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-xl);
  border: 1px solid var(--gray-200);
}

.volunteer-visual {
  position: relative;
  padding: var(--spacing-2xl);
  background: var(--gradient-surface);
}

.volunteer-logo-wrapper {
  text-align: center;
  margin-bottom: var(--spacing-lg);
}

.volunteer-logo {
  max-width: 200px;
  height: auto;
  margin: 0 auto;
}

.volunteer-image-wrapper {
  border-radius: var(--border-radius);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}

.volunteer-image {
  width: 100%;
  height: auto;
}

.volunteer-content {
  padding: var(--spacing-2xl);
}

.volunteer-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: 0.5rem 1rem;
  background: linear-gradient(135deg, rgba(255, 107, 107, 0.1) 0%, rgba(255, 142, 83, 0.1) 100%);
  border: 1px solid rgba(255, 107, 107, 0.2);
  border-radius: 20px;
  color: #FF6B6B;
  font-weight: 600;
  font-size: 0.875rem;
  margin-bottom: var(--spacing-md);
}

.volunteer-title {
  font-size: 1.75rem;
  margin-bottom: var(--spacing-md);
  color: var(--gray-900);
}

.volunteer-description {
  color: var(--gray-600);
  line-height: 1.8;
  margin-bottom: var(--spacing-lg);
}

.volunteer-impact h4 {
  font-size: 1.125rem;
  color: var(--gray-900);
  margin-bottom: var(--spacing-sm);
}

.volunteer-impact-list {
  list-style: none;
  margin-bottom: var(--spacing-lg);
}

.volunteer-impact-list li {
  position: relative;
  padding-left: var(--spacing-lg);
  margin-bottom: var(--spacing-sm);
  color: var(--gray-600);
}

.volunteer-impact-list li::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: #FF6B6B;
  font-weight: 700;
}

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

/* ==========================================================================
   AWARDS SECTION
   ========================================================================== */

.awards-showcase {
  max-width: 900px;
  margin: 0 auto;
}

.award-card-premium {
  position: relative;
  background: rgba(255, 255, 255, 0.05);
  backdrop-filter: blur(20px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--border-radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-xl);
}

.award-ribbon {
  position: absolute;
  top: 20px;
  right: 20px;
  width: 60px;
  height: 60px;
  background: var(--gradient-primary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--white);
  box-shadow: var(--shadow-lg);
  z-index: 1;
}

.award-content-wrapper {
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: var(--spacing-2xl);
  padding: var(--spacing-2xl);
}

.award-visual-section {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
}

.award-logo-wrapper {
  text-align: center;
  padding: var(--spacing-lg);
  background: rgba(255, 255, 255, 0.05);
  border-radius: var(--border-radius);
}

.award-logo {
  max-width: 150px;
  height: auto;
}

.award-certificate-wrapper {
  border-radius: var(--border-radius);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}

.award-certificate {
  width: 100%;
  height: auto;
}

.award-year {
  display: inline-block;
  padding: 0.5rem 1rem;
  background: var(--gradient-primary);
  color: var(--white);
  border-radius: 20px;
  font-weight: 700;
  font-size: 0.875rem;
  margin-bottom: var(--spacing-md);
}

.award-title {
  font-size: 1.75rem;
  color: var(--white);
  margin-bottom: var(--spacing-md);
  line-height: 1.3;
}

.award-description {
  color: var(--gray-300);
  line-height: 1.8;
  margin-bottom: var(--spacing-lg);
}

.award-highlights h4 {
  font-size: 1.125rem;
  color: var(--white);
  margin-bottom: var(--spacing-sm);
}

.award-highlights-list {
  list-style: none;
  margin-bottom: var(--spacing-lg);
}

.award-highlights-list li {
  position: relative;
  padding-left: var(--spacing-lg);
  margin-bottom: var(--spacing-sm);
  color: var(--gray-300);
}

.award-highlights-list li::before {
  content: '★';
  position: absolute;
  left: 0;
  color: var(--accent);
  font-weight: 700;
}

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

.award-tag {
  padding: 0.5rem 1rem;
  background: rgba(0, 194, 255, 0.1);
  border: 1px solid rgba(0, 194, 255, 0.2);
  border-radius: 20px;
  font-size: 0.875rem;
  color: var(--accent);
  font-weight: 500;
}

/* ==========================================================================
   SKILLS SECTION
   ========================================================================== */

.skills-clusters {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: var(--spacing-xl);
}

.skill-cluster {
  background: var(--white);
  padding: var(--spacing-xl);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow);
  border: 1px solid var(--gray-200);
  transition: var(--transition);
}

.skill-cluster:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
  border-color: var(--primary);
}

.skill-cluster-header {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
}

.skill-cluster-icon {
  width: 56px;
  height: 56px;
  background: var(--gradient-surface);
  border-radius: var(--border-radius);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary);
}

.skill-cluster-title {
  font-size: 1.25rem;
  color: var(--gray-900);
}

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

.skill-chip-animated {
  padding: 0.625rem 1.125rem;
  background: var(--gray-100);
  border: 1px solid var(--gray-200);
  border-radius: 20px;
  font-size: 0.9375rem;
  color: var(--gray-700);
  font-weight: 500;
  transition: var(--transition);
  cursor: default;
}

.skill-chip-animated:hover {
  background: var(--gradient-primary);
  color: var(--white);
  border-color: var(--primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

/* ==========================================================================
   CONTACT SECTION
   ========================================================================== */

.contact-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-3xl);
  max-width: 1000px;
  margin: 0 auto;
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
}

.contact-item {
  display: flex;
  gap: var(--spacing-md);
  padding: var(--spacing-lg);
  background: rgba(255, 255, 255, 0.05);
  backdrop-filter: blur(20px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--border-radius);
  transition: var(--transition);
}

.contact-item:hover {
  border-color: var(--primary);
  transform: translateX(8px);
}

.contact-icon {
  width: 48px;
  height: 48px;
  background: var(--gradient-primary);
  border-radius: var(--border-radius);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--white);
  flex-shrink: 0;
}

.contact-details {
  flex: 1;
}

.contact-label {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--gray-400);
  margin-bottom: 4px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.contact-link {
  color: var(--white);
  font-size: 1.0625rem;
  font-weight: 500;
  transition: var(--transition);
}

.contact-link:hover {
  color: var(--primary);
}

.contact-text {
  color: var(--gray-300);
  font-size: 1.0625rem;
}

.contact-cta {
  display: flex;
  align-items: center;
}

.cta-card {
  background: rgba(255, 255, 255, 0.05);
  backdrop-filter: blur(20px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-2xl);
  text-align: center;
}

.cta-icon {
  width: 80px;
  height: 80px;
  background: var(--gradient-primary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--white);
  margin: 0 auto var(--spacing-lg);
}

.cta-title {
  font-size: 1.75rem;
  color: var(--white);
  margin-bottom: var(--spacing-md);
}

.cta-text {
  color: var(--gray-300);
  line-height: 1.8;
  margin-bottom: var(--spacing-xl);
}

/* ==========================================================================
   FOOTER
   ========================================================================== */

.footer {
  background: var(--dark-bg);
  padding: var(--spacing-2xl) 0;
  border-top: 1px solid var(--dark-border);
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-lg);
  padding-bottom: var(--spacing-lg);
  border-bottom: 1px solid var(--dark-border);
}

.footer-name {
  font-size: 1.25rem;
  color: var(--white);
  margin-bottom: var(--spacing-xs);
}

.footer-tagline {
  color: var(--gray-400);
  font-size: 0.9375rem;
}

.footer-social {
  display: flex;
  gap: var(--spacing-md);
}

.footer-social-link {
  width: 40px;
  height: 40px;
  background: rgba(255, 255, 255, 0.05);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--gray-400);
  transition: var(--transition);
}

.footer-social-link:hover {
  background: var(--gradient-primary);
  color: var(--white);
  transform: translateY(-4px);
}

.footer-bottom {
  text-align: center;
}

.footer-copyright {
  color: var(--gray-500);
  font-size: 0.875rem;
}

/* ==========================================================================
   RESPONSIVE DESIGN
   ========================================================================== */

@media (max-width: 1024px) {
  .research-content-wrapper,
  .award-content-wrapper {
    grid-template-columns: 1fr;
  }
  
  .contact-content {
    grid-template-columns: 1fr;
    gap: var(--spacing-2xl);
  }
}

@media (max-width: 768px) {
  .nav-menu {
    position: fixed;
    top: 80px;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(20px);
    flex-direction: column;
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-lg);
    transform: translateX(100%);
    transition: var(--transition);
  }
  
  .nav-menu.active {
    transform: translateX(0);
  }
  
  .nav-toggle {
    display: flex;
  }
  
  .hero-buttons {
    flex-direction: column;
    align-items: stretch;
  }
  
  .btn {
    justify-content: center;
  }
  
  .about-cards,
  .projects-grid,
  .certifications-grid {
    grid-template-columns: 1fr;
  }
  
  .timeline::before {
    left: 10px;
  }
  
  .timeline-item {
    padding-left: 40px;
  }
  
  .timeline-marker {
    left: 2px;
  }
  
  .education-card {
    flex-direction: column;
  }
  
  .skills-clusters {
    grid-template-columns: 1fr;
  }
  
  .footer-content {
    flex-direction: column;
    text-align: center;
    gap: var(--spacing-lg);
  }
}

@media (max-width: 480px) {
  :root {
    --spacing-3xl: 3rem;
  }
  
  .section-header {
    margin-bottom: var(--spacing-2xl);
  }
  
  .hero-image-wrapper {
    width: 140px;
    height: 140px;
  }
  
  .experience-header,
  .cert-header {
    flex-direction: column;
    align-items: flex-start;
  }
  
  .project-image-link {
    pointer-events: none;
  }
  
  .project-overlay {
    opacity: 1;
    background: rgba(11, 119, 255, 0.85);
  }
}

/* ==========================================================================
   ANIMATIONS
   ========================================================================== */

[data-aos] {
  opacity: 0;
  transition: opacity 0.6s ease, transform 0.6s ease;
}

[data-aos].aos-animate {
  opacity: 1;
}

[data-aos="fade-up"] {
  transform: translateY(30px);
}

[data-aos="fade-up"].aos-animate {
  transform: translateY(0);
}

/* ==========================================================================
   ACCESSIBILITY
   ========================================================================== */

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

:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 4px;
}

.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;
}





/* ==========================================
   MY TEAM SECTION
========================================== */

.team-gallery{
    display:flex;
    justify-content:center;
    align-items:center;
    flex-wrap:wrap;
    gap:24px;
    max-width:1000px;
    margin:0 auto;
}

.team-circle{
    width:140px;
    height:140px;
    border-radius:50%;
    overflow:hidden;
    border:4px solid rgba(11,119,255,0.15);
    transition:var(--transition);
    box-shadow:var(--shadow);
}

.team-circle img{
    width:100%;
    height:100%;
    object-fit:cover;
    display:block;
}

.team-circle:hover{
    transform:translateY(-8px) scale(1.05);
    border-color:var(--primary);
    box-shadow:var(--shadow-xl);
}

/* Tablet */

@media (max-width:768px){

    .team-circle{
        width:110px;
        height:110px;
    }

    .team-gallery{
        gap:18px;
    }

}

/* Mobile */

@media (max-width:480px){

    .team-circle{
        width:90px;
        height:90px;
    }

    .team-gallery{
        gap:14px;
    }

}




/* ==========================================================================
   PRINT STYLES
   ========================================================================== */

@media print {
  .nav,
  .hero-background,
  .scroll-indicator,
  .btn,
  .footer-social {
    display: none;
  }
  
  body {
    background: white;
    color: black;
  }
  
  .section {
    page-break-inside: avoid;
  }
}