/* =================================================================
   SPECTACULAR PORTFOLIO DESIGN SYSTEM
   Ultra-modern, unique design with advanced animations
   ================================================================= */
@import url("https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&family=JetBrains+Mono:wght@400;500;600&display=swap");
/* =================================================================
   DESIGN TOKENS & CSS CUSTOM PROPERTIES
   ================================================================= */
:root {
  /* Brand Colors - Unique Color Palette */
  --primary-50: #f0f9ff;
  --primary-100: #e0f2fe;
  --primary-200: #bae6fd;
  --primary-300: #7dd3fc;
  --primary-400: #38bdf8;
  --primary-500: #0ea5e9;
  --primary-600: #0284c7;
  --primary-700: #0369a1;
  --primary-800: #075985;
  --primary-900: #0c4a6e;
  /* Accent Colors */
  --accent-purple: #8b5cf6;
  --accent-pink: #ec4899;
  --accent-orange: #f97316;
  --accent-green: #10b981;
  /* Neutral Colors */
  --neutral-50: #fafafa;
  --neutral-100: #f4f4f5;
  --neutral-200: #e4e4e7;
  --neutral-300: #d4d4d8;
  --neutral-400: #a1a1aa;
  --neutral-500: #71717a;
  --neutral-600: #52525b;
  --neutral-700: #3f3f46;
  --neutral-800: #27272a;
  --neutral-900: #18181b;
  /* Dynamic Theme Colors */
  --background: var(--neutral-50);
  --surface: #ffffff;
  --surface-variant: var(--neutral-100);
  --text-primary: var(--neutral-900);
  --text-secondary: var(--neutral-600);
  --text-muted: var(--neutral-500);
  --border: var(--neutral-200);
  /* Gradients */
  --gradient-primary: linear-gradient(
    135deg,
    var(--primary-600),
    var(--primary-400)
  );
  --gradient-accent: linear-gradient(
    135deg,
    var(--accent-purple),
    var(--accent-pink)
  );
  --gradient-warm: linear-gradient(
    135deg,
    var(--accent-orange),
    var(--accent-pink)
  );
  --gradient-cool: linear-gradient(
    135deg,
    var(--primary-500),
    var(--accent-purple)
  );
  --gradient-text: linear-gradient(
    135deg,
    var(--primary-600),
    var(--accent-purple)
  );
  /* Typography */
  --font-family: "Inter", system-ui, -apple-system, sans-serif;
  --font-mono: "JetBrains Mono", monospace;
  /* Spacing System */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
  /* Border Radius */
  --radius-sm: 0.5rem;
  --radius-md: 0.75rem;
  --radius-lg: 1rem;
  --radius-xl: 1.5rem;
  --radius-2xl: 2rem;
  --radius-full: 9999px;
  /* Shadows */
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 8px 25px rgba(0, 0, 0, 0.15);
  --shadow-xl: 0 20px 40px rgba(0, 0, 0, 0.2);
  --shadow-glow: 0 0 40px rgba(14, 165, 233, 0.3);
  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 300ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 500ms cubic-bezier(0.4, 0, 0.2, 1);
  /* Layout */
  --container-max-width: 1200px;
  --header-height: 80px;
}

/* Dark Theme Colors */
[data-theme=dark] {
  --background: var(--neutral-900);
  --surface: var(--neutral-800);
  --surface-variant: var(--neutral-700);
  --text-primary: var(--neutral-50);
  --text-secondary: var(--neutral-300);
  --text-muted: var(--neutral-400);
  --border: var(--neutral-700);
  --shadow-glow: 0 0 40px rgba(139, 92, 246, 0.3);
}

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

html {
  scroll-behavior: smooth;
  overflow-x: hidden;
}

body {
  font-family: var(--font-family);
  font-size: 16px;
  line-height: 1.6;
  color: var(--text-primary);
  background: var(--background);
  transition: background-color var(--transition-normal), color var(--transition-normal);
  min-height: 100vh;
  overflow-x: hidden;
}

/* =================================================================
   LOADING SCREEN
   ================================================================= */
.loading-screen {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, var(--primary-600), var(--accent-purple));
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10000;
  transition: opacity 0.5s ease-out, visibility 0.5s ease-out;
}

.loading-screen.hidden {
  opacity: 0;
  visibility: hidden;
}

.loader {
  text-align: center;
  color: white;
}

.loader-circle {
  width: 60px;
  height: 60px;
  border: 3px solid rgba(255, 255, 255, 0.3);
  border-top: 3px solid white;
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin: 0 auto var(--space-4) auto;
}

.loader-text {
  font-size: 1.2rem;
  font-weight: 600;
  animation: pulse 2s ease-in-out infinite;
}

@keyframes spin {
  0% {
    transform: rotate(0deg);
  }
  100% {
    transform: rotate(360deg);
  }
}
@keyframes pulse {
  0%, 100% {
    opacity: 0.8;
  }
  50% {
    opacity: 1;
  }
}
/* =================================================================
   PARTICLES BACKGROUND
   ================================================================= */
.particles-container {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: -1;
}

.particle {
  position: absolute;
  width: 4px;
  height: 4px;
  background: var(--primary-400);
  border-radius: 50%;
  opacity: 0.6;
  animation: float 20s linear infinite;
}

.particle:nth-child(1) {
  left: 10%;
  animation-delay: 0s;
  animation-duration: 15s;
}

.particle:nth-child(2) {
  left: 20%;
  animation-delay: 2s;
  animation-duration: 18s;
}

.particle:nth-child(3) {
  left: 60%;
  animation-delay: 4s;
  animation-duration: 22s;
}

.particle:nth-child(4) {
  left: 80%;
  animation-delay: 6s;
  animation-duration: 16s;
}

.particle:nth-child(5) {
  left: 90%;
  animation-delay: 8s;
  animation-duration: 20s;
}

@keyframes float {
  0% {
    transform: translateY(100vh) rotate(0deg);
    opacity: 0;
  }
  10% {
    opacity: 0.6;
  }
  90% {
    opacity: 0.6;
  }
  100% {
    transform: translateY(-100px) rotate(360deg);
    opacity: 0;
  }
}
/* =================================================================
   NAVIGATION STYLES
   ================================================================= */
.desktop-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: rgba(255, 255, 255, 0.95);
  -webkit-backdrop-filter: blur(20px);
          backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  z-index: 1000;
  transition: all var(--transition-normal);
}

[data-theme=dark] .desktop-nav {
  background: rgba(24, 24, 27, 0.95);
}

.nav-container {
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 var(--space-6);
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-height);
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--text-primary);
  text-decoration: none;
}

.logo-img {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
}

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

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.nav-link {
  color: var(--text-secondary);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.875rem;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-full);
  transition: all var(--transition-normal);
  position: relative;
  white-space: nowrap;
}

.nav-link:hover,
.nav-link.active {
  color: var(--primary-600);
  background: var(--primary-50);
}

[data-theme=dark] .nav-link:hover,
[data-theme=dark] .nav-link.active {
  color: var(--primary-400);
  background: rgba(14, 165, 233, 0.1);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.theme-toggle {
  background: none;
  border: 1px solid var(--border);
  color: var(--text-secondary);
  font-size: 1.1rem;
  padding: var(--space-2);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-normal);
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.theme-toggle:hover {
  color: var(--primary-600);
  background: var(--surface-variant);
}

.mobile-menu-btn {
  display: none;
  flex-direction: column;
  gap: 4px;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-2);
}

.mobile-menu-btn span {
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: all var(--transition-normal);
}

/* Mobile Navigation */
.mobile-nav-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.5);
  -webkit-backdrop-filter: blur(4px);
          backdrop-filter: blur(4px);
  z-index: 1001;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal);
}

.mobile-nav-overlay.active,
.mobile-nav-overlay.show {
  opacity: 1;
  visibility: visible;
}

.mobile-nav {
  position: fixed;
  top: 0;
  right: -100%;
  width: 280px;
  height: 100vh;
  background: var(--surface);
  box-shadow: var(--shadow-xl);
  z-index: 1002;
  transition: right var(--transition-normal);
  overflow-y: auto;
}

.mobile-nav.active,
.mobile-nav.show {
  right: 0;
}

.mobile-nav-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-6);
  border-bottom: 1px solid var(--border);
}

.mobile-nav-close {
  background: none;
  border: none;
  font-size: 1.5rem;
  color: var(--text-secondary);
  cursor: pointer;
  padding: var(--space-2);
  border-radius: var(--radius-md);
}

.mobile-nav-links {
  padding: var(--space-6) 0;
}

.mobile-nav-link {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  padding: var(--space-4) var(--space-6);
  color: var(--text-secondary);
  text-decoration: none;
  transition: all var(--transition-normal);
}

.mobile-nav-link:hover,
.mobile-nav-link.active {
  background: var(--primary-50);
  color: var(--primary-600);
}

[data-theme=dark] .mobile-nav-link:hover,
[data-theme=dark] .mobile-nav-link.active {
  background: rgba(14, 165, 233, 0.1);
  color: var(--primary-400);
}

/* =================================================================
   MAIN CONTENT & SECTIONS
   ================================================================= */
.main-wrapper {
  padding-top: var(--header-height);
}

.section {
  padding: var(--space-24) 0;
  position: relative;
}

.container {
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.section-header {
  text-align: center;
  margin-bottom: var(--space-20);
}

.section-subtitle {
  display: inline-block;
  padding: var(--space-2) var(--space-4);
  background: var(--primary-50);
  color: var(--primary-600);
  font-size: 0.875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  border-radius: var(--radius-full);
  margin-bottom: var(--space-4);
}

[data-theme=dark] .section-subtitle {
  background: rgba(14, 165, 233, 0.1);
  color: var(--primary-400);
}

.section-title {
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: var(--space-6);
}

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

/* =================================================================
   HERO SECTION
   ================================================================= */
.hero-section {
  min-height: 100vh;
  display: flex;
  align-items: center;
  background: linear-gradient(135deg, var(--background) 0%, rgba(14, 165, 233, 0.05) 50%, var(--background) 100%);
  position: relative;
  overflow: hidden;
}

.hero-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-20);
  align-items: center;
  z-index: 1;
}

.hero-left {
  position: relative;
}

.hero-image {
  position: relative;
  max-width: 500px;
  margin: 0 auto;
}

.image-wrapper {
  position: relative;
  border-radius: var(--radius-2xl);
  overflow: hidden;
  box-shadow: var(--shadow-xl);
  background: var(--gradient-primary);
  padding: 8px;
}

.hero-photo {
  width: 100%;
  height: 600px;
  -o-object-fit: cover;
     object-fit: cover;
  -o-object-position: center top;
     object-position: center top;
  border-radius: var(--radius-xl);
  display: block;
}

.image-overlay {
  position: absolute;
  inset: 8px;
  background: linear-gradient(45deg, transparent 0%, rgba(14, 165, 233, 0.1) 30%, transparent 70%, rgba(139, 92, 246, 0.1) 100%);
  border-radius: var(--radius-xl);
  pointer-events: none;
}

.floating-elements {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.float-item {
  position: absolute;
  width: 60px;
  height: 60px;
  background: var(--surface);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  color: var(--primary-600);
  box-shadow: var(--shadow-lg);
  animation: floatAround 6s ease-in-out infinite;
}

.float-1 {
  top: 10%;
  left: -30px;
  animation-delay: 0s;
}

.float-2 {
  top: 30%;
  right: -30px;
  animation-delay: 1s;
}

.float-3 {
  bottom: 30%;
  left: -30px;
  animation-delay: 2s;
}

.float-4 {
  bottom: 10%;
  right: -30px;
  animation-delay: 3s;
}

.float-5 {
  top: 50%;
  left: -40px;
  animation-delay: 4s;
}

.float-6 {
  top: 70%;
  right: -40px;
  animation-delay: 5s;
}

@keyframes floatAround {
  0%, 100% {
    transform: translateY(0px) rotate(0deg);
  }
  50% {
    transform: translateY(-20px) rotate(10deg);
  }
}
.hero-right {
  z-index: 2;
}

.greeting {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-size: 1.25rem;
  color: var(--text-secondary);
  margin-bottom: var(--space-4);
}

.wave {
  font-size: 2rem;
  animation: wave 2s ease-in-out infinite;
}

@keyframes wave {
  0%, 100% {
    transform: rotate(0deg);
  }
  25% {
    transform: rotate(-10deg);
  }
  75% {
    transform: rotate(10deg);
  }
}
.hero-title {
  font-size: clamp(3rem, 6vw, 5rem);
  font-weight: 900;
  line-height: 1.1;
  margin-bottom: var(--space-6);
}

.name-first {
  color: var(--text-primary);
}

.hero-subtitle {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--primary-600);
  margin-bottom: var(--space-8);
  min-height: 2em;
  display: flex;
  align-items: center;
}

.typewriter {
  font-family: var(--font-mono);
}

.cursor {
  animation: blink 1s infinite;
  color: var(--primary-600);
}

@keyframes blink {
  0%, 50% {
    opacity: 1;
  }
  51%, 100% {
    opacity: 0;
  }
}
.hero-description {
  font-size: 1.125rem;
  line-height: 1.7;
  color: var(--text-secondary);
  margin-bottom: var(--space-10);
}

.hero-stats {
  display: flex;
  gap: var(--space-8);
  margin-bottom: var(--space-10);
}

.stat-item {
  text-align: center;
}

.stat-number {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--primary-600);
  line-height: 1;
}

.stat-label {
  font-size: 0.875rem;
  color: var(--text-muted);
  font-weight: 500;
  margin-top: var(--space-1);
}

.hero-actions {
  display: flex;
  gap: var(--space-4);
  margin-bottom: var(--space-12);
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-4) var(--space-8);
  border-radius: var(--radius-full);
  font-weight: 600;
  font-size: 1rem;
  text-decoration: none;
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.btn-primary {
  background: var(--gradient-primary);
  color: white;
  border: none;
  box-shadow: var(--shadow-md);
}

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

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

.btn-outline:hover {
  background: var(--primary-600);
  color: white;
  border-color: var(--primary-600);
}

.social-links {
  display: flex;
  gap: var(--space-4);
}

.social-link {
  width: 50px;
  height: 50px;
  border-radius: var(--radius-lg);
  background: var(--surface-variant);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  font-size: 1.25rem;
  text-decoration: none;
  transition: all var(--transition-normal);
  position: relative;
}

.social-link:hover {
  background: var(--primary-600);
  color: white;
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.scroll-indicator {
  position: absolute;
  bottom: var(--space-8);
  left: 50%;
  transform: translateX(-50%);
  text-align: center;
  color: var(--text-muted);
  animation: bounce 2s infinite;
}

.scroll-text {
  font-size: 0.875rem;
  margin-bottom: var(--space-2);
}

@keyframes bounce {
  0%, 100% {
    transform: translateX(-50%) translateY(0);
  }
  50% {
    transform: translateX(-50%) translateY(-10px);
  }
}
/* =================================================================
   ABOUT SECTION
   ================================================================= */
.about-section {
  background: var(--surface);
  position: relative;
}

.about-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-20);
  align-items: start;
}

.about-text h3 {
  font-size: 2rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--space-6);
}

.about-text p {
  font-size: 1.125rem;
  line-height: 1.7;
  color: var(--text-secondary);
  margin-bottom: var(--space-6);
}

.about-highlights {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
  margin-top: var(--space-8);
}

.highlight-item {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  padding: var(--space-6);
  background: var(--background);
  border-radius: var(--radius-xl);
  border: 1px solid var(--border);
  transition: all var(--transition-normal);
}

.highlight-item:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-color: var(--primary-200);
}

.highlight-item i {
  font-size: 2rem;
  color: var(--primary-600);
  flex-shrink: 0;
}

.highlight-item h4 {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-1);
}

.highlight-item p {
  color: var(--text-secondary);
  margin: 0;
}

.skills-section h3 {
  font-size: 2rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--space-8);
}

.skills-grid {
  display: flex;
  flex-direction: column;
  gap: var(--space-8);
}

.skill-category {
  padding: var(--space-6);
  background: var(--background);
  border-radius: var(--radius-xl);
  border: 1px solid var(--border);
}

.skill-category h4 {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-4);
}

.skill-category i {
  color: var(--primary-600);
}

.skill-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
}

.skill-tag {
  padding: var(--space-2) var(--space-4);
  background: var(--primary-50);
  color: var(--primary-700);
  font-size: 0.875rem;
  font-weight: 500;
  border-radius: var(--radius-full);
}

[data-theme=dark] .skill-tag {
  background: rgba(14, 165, 233, 0.1);
  color: var(--primary-300);
}

/* =================================================================
   PORTFOLIO SECTION
   ================================================================= */
.portfolio-section {
  background: var(--background);
}

.portfolio-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
  gap: var(--space-8);
}

.portfolio-card {
  background: var(--surface);
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  transition: all var(--transition-normal);
  border: 1px solid var(--border);
}

.portfolio-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-xl);
}

.card-image {
  position: relative;
  height: 250px;
  overflow: hidden;
}

.card-image img {
  width: 100%;
  height: 100%;
  -o-object-fit: cover;
     object-fit: cover;
  transition: transform var(--transition-slow);
}

.portfolio-card:hover .card-image img {
  transform: scale(1.1);
}

.card-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(45deg, rgba(14, 165, 233, 0.9), rgba(139, 92, 246, 0.9));
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: all var(--transition-normal);
}

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

.overlay-content {
  text-align: center;
  color: white;
  padding: var(--space-6);
}

.overlay-content h3 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: var(--space-3);
}

.overlay-content p {
  font-size: 1rem;
  margin-bottom: var(--space-4);
  opacity: 0.9;
}

.tech-stack {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  justify-content: center;
}

.tech-tag {
  padding: var(--space-1) var(--space-3);
  background: rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 500;
}

.card-content {
  padding: var(--space-6);
  display: flex;
  justify-content: center;
}

.card-icons {
  display: flex;
  gap: var(--space-4);
}

.card-icon {
  width: 45px;
  height: 45px;
  border-radius: var(--radius-lg);
  background: var(--surface-variant);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 1.1rem;
  transition: all var(--transition-normal);
}

.card-icon:hover {
  background: var(--primary-600);
  color: white;
  transform: translateY(-2px);
}

/* =================================================================
   RESEARCH SECTION
   ================================================================= */
.research-section {
  background: var(--surface);
}

.research-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: var(--space-8);
}

.research-card {
  background: var(--background);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  border: 1px solid var(--border);
  transition: all var(--transition-normal);
  position: relative;
}

.research-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary-200);
}

.research-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--gradient-primary);
  border-radius: var(--radius-xl) var(--radius-xl) 0 0;
}

.research-status {
  display: inline-block;
  padding: var(--space-1) var(--space-3);
  background: var(--accent-green);
  color: white;
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  margin-bottom: var(--space-4);
}

.research-status.in-progress {
  background: var(--accent-orange);
}

.research-status.planned {
  background: var(--neutral-400);
}

.research-card h3 {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--space-4);
}

.research-card p {
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: var(--space-6);
}

.research-meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  margin-bottom: var(--space-6);
}

.research-meta-item {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: 0.875rem;
  color: var(--text-muted);
}

.research-meta-item i {
  color: var(--primary-600);
}

.research-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.research-tag {
  padding: var(--space-1) var(--space-3);
  background: var(--primary-50);
  color: var(--primary-700);
  font-size: 0.75rem;
  font-weight: 500;
  border-radius: var(--radius-full);
}

[data-theme=dark] .research-tag {
  background: rgba(14, 165, 233, 0.1);
  color: var(--primary-300);
}

.research-actions {
  display: flex;
  gap: var(--space-3);
  margin-top: var(--space-6);
}

.research-btn {
  width: 45px;
  height: 45px;
  border-radius: var(--radius-lg);
  background: var(--surface-variant);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 1.1rem;
  transition: all var(--transition-normal);
  border: 1px solid var(--border);
}

.research-btn:hover {
  background: var(--primary-600);
  color: white;
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.research-btn[title="Read Paper"]:hover {
  background: var(--accent-orange);
}

.research-btn[title="View Code"]:hover {
  background: var(--neutral-800);
}

.research-btn[title=Citation]:hover {
  background: var(--accent-purple);
}

/* =================================================================
   STARTUPS SECTION
   ================================================================= */
.startups-section {
  background: var(--background);
}

.startups-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
  gap: var(--space-8);
}

.startup-card {
  background: var(--surface);
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  transition: all var(--transition-normal);
  border: 1px solid var(--border);
}

.startup-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-xl);
}

.startup-header {
  padding: var(--space-8);
  background: var(--gradient-primary);
  color: white;
  text-align: center;
}

.startup-logo {
  width: 80px;
  height: 80px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-xl);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  margin: 0 auto var(--space-4) auto;
}

.startup-name {
  font-size: 1.75rem;
  font-weight: 800;
  margin-bottom: var(--space-2);
}

.startup-tagline {
  font-size: 1rem;
  opacity: 0.9;
}

.startup-content {
  padding: var(--space-8);
}

.startup-description {
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: var(--space-6);
}

.startup-metrics {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: var(--space-4);
  margin-bottom: var(--space-6);
}

.metric-item {
  text-align: center;
  padding: var(--space-4);
  background: var(--background);
  border-radius: var(--radius-lg);
}

.metric-value {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary-600);
  line-height: 1;
}

.metric-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: var(--space-1);
}

.startup-technologies {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.tech-tag {
  padding: var(--space-1) var(--space-3);
  background: var(--primary-50);
  color: var(--primary-700);
  font-size: 0.75rem;
  font-weight: 500;
  border-radius: var(--radius-full);
}

[data-theme=dark] .tech-tag {
  background: rgba(14, 165, 233, 0.1);
  color: var(--primary-300);
}

.startup-actions {
  display: flex;
  gap: var(--space-4);
  padding: var(--space-6) var(--space-8);
  background: var(--surface-variant);
  border-top: 1px solid var(--border);
}

.startup-link {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-4);
  background: var(--primary-600);
  color: white;
  text-decoration: none;
  border-radius: var(--radius-lg);
  font-weight: 500;
  font-size: 0.875rem;
  transition: all var(--transition-normal);
  flex: 1;
  justify-content: center;
}

.startup-link:hover {
  background: var(--primary-700);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.startup-link:nth-child(2) {
  background: var(--surface);
  color: var(--text-primary);
  border: 1px solid var(--border);
}

.startup-link:nth-child(2):hover {
  background: var(--primary-50);
  color: var(--primary-600);
  border-color: var(--primary-200);
}

[data-theme=dark] .startup-link:nth-child(2) {
  background: var(--surface);
  color: var(--text-primary);
}

[data-theme=dark] .startup-link:nth-child(2):hover {
  background: rgba(14, 165, 233, 0.1);
  color: var(--primary-400);
}

/* =================================================================
   TIMELINE SECTION (CERTIFICATIONS & ACHIEVEMENTS)
   ================================================================= */
.timeline-section {
  background: var(--surface);
}

.timeline {
  position: relative;
  padding-left: var(--space-8);
}

.timeline::before {
  content: "";
  position: absolute;
  left: var(--space-4);
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--gradient-primary);
}

.timeline-item {
  position: relative;
  margin-bottom: var(--space-12);
  background: var(--background);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  border: 1px solid var(--border);
  transition: all var(--transition-normal);
}

.timeline-item:hover {
  transform: translateX(var(--space-4));
  box-shadow: var(--shadow-lg);
  border-color: var(--primary-200);
}

.timeline-item::before {
  content: "";
  position: absolute;
  left: -2.5rem;
  top: var(--space-8);
  width: 16px;
  height: 16px;
  background: var(--primary-600);
  border-radius: 50%;
  border: 3px solid var(--surface);
}

/* Certifications Grid Styles */
.certifications-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: var(--space-6);
}

.certification-card {
  background: var(--surface);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  border: 1px solid var(--border);
  transition: all var(--transition-normal);
  display: flex;
  align-items: flex-start;
  gap: var(--space-4);
}

.certification-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary-200);
}

.cert-icon {
  width: 60px;
  height: 60px;
  border-radius: var(--radius-lg);
  background: var(--primary-50);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary-600);
  font-size: 1.5rem;
  flex-shrink: 0;
}

[data-theme=dark] .cert-icon {
  background: rgba(14, 165, 233, 0.1);
  color: var(--primary-400);
}

.cert-content h4 {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-2);
}

.cert-issuer {
  font-size: 0.875rem;
  color: var(--primary-600);
  font-weight: 500;
  margin-bottom: var(--space-1);
}

.cert-date {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-bottom: var(--space-3);
}

.cert-description {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.5;
  margin: 0;
}

/* Achievements Section */
.achievements-section {
  background: var(--background);
}

.achievements-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-6);
  margin-bottom: var(--space-16);
}

.achievement-card {
  background: var(--surface);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  border: 1px solid var(--border);
  transition: all var(--transition-normal);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.achievement-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--gradient-accent);
}

.achievement-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-xl);
}

.achievement-icon {
  width: 70px;
  height: 70px;
  margin: 0 auto var(--space-4) auto;
  border-radius: 50%;
  background: var(--gradient-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 1.75rem;
}

.achievement-card h4 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--space-2);
}

.achievement-event {
  font-size: 0.875rem;
  color: var(--primary-600);
  font-weight: 500;
  margin-bottom: var(--space-3);
}

.achievement-description {
  color: var(--text-secondary);
  line-height: 1.5;
  margin: 0;
  font-size: 0.9rem;
}

/* Featured Section */
.featured-section {
  text-align: center;
  padding: var(--space-12) 0 0 0;
  border-top: 1px solid var(--border);
}

.featured-title {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--space-8);
}

.featured-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: var(--space-6);
  max-width: 800px;
  margin: 0 auto;
}

.featured-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-4);
  background: var(--surface);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  transition: all var(--transition-normal);
}

.featured-item:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.featured-item img {
  width: 60px;
  height: 60px;
  -o-object-fit: contain;
     object-fit: contain;
  border-radius: var(--radius-md);
}

.featured-item span {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
}

/* =================================================================
   TESTIMONIALS SECTION
   ================================================================= */
.testimonials-section {
  background: var(--surface);
}

.testimonials-slider {
  position: relative;
  max-width: 800px;
  margin: 0 auto;
}

.testimonials-container {
  transition: height 0.35s ease;
  position: relative;
  min-height: auto;
}

.testimonial-card {
  background: var(--background);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  border: 1px solid var(--border);
  opacity: 0;
  visibility: hidden;
  position: absolute;
  inset: 0;
  transition: opacity var(--transition-normal), transform var(--transition-normal);
  transform: translateY(20px);
  pointer-events: none;
}

.testimonial-card.active {
  opacity: 1;
  visibility: visible;
  position: relative;
  transform: translateY(0);
  pointer-events: auto;
}

.testimonial-content {
  text-align: center;
  margin-bottom: var(--space-6);
}

.quote-icon {
  font-size: 2rem;
  color: var(--primary-600);
  margin-bottom: var(--space-4);
}

.testimonial-content p {
  font-size: 1.125rem;
  line-height: 1.7;
  color: var(--text-secondary);
  font-style: italic;
  margin: 0;
}

.testimonial-author {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-4);
}

.author-avatar {
  width: 60px;
  height: 60px;
  border-radius: 50%;
  background: var(--primary-50);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary-600);
  font-size: 1.5rem;
  flex-shrink: 0;
}

[data-theme=dark] .author-avatar {
  background: rgba(14, 165, 233, 0.1);
  color: var(--primary-400);
}

.author-info h5 {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-1);
}

.author-info span {
  font-size: 0.875rem;
  color: var(--text-muted);
}

.testimonial-navigation {
  display: flex;
  justify-content: center;
  gap: var(--space-2);
  margin-top: var(--space-8);
}

.testimonial-nav-btn {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  border: none;
  background: var(--neutral-300);
  cursor: pointer;
  transition: all var(--transition-normal);
}

.testimonial-nav-btn.active,
.testimonial-nav-btn:hover {
  background: var(--primary-600);
  transform: scale(1.2);
}

.timeline-date {
  display: inline-block;
  padding: var(--space-1) var(--space-3);
  background: var(--primary-50);
  color: var(--primary-700);
  font-size: 0.875rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  margin-bottom: var(--space-4);
}

[data-theme=dark] .timeline-date {
  background: rgba(14, 165, 233, 0.1);
  color: var(--primary-300);
}

.timeline-title {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--space-2);
}

.timeline-organization {
  font-size: 1rem;
  color: var(--primary-600);
  font-weight: 600;
  margin-bottom: var(--space-4);
}

.timeline-description {
  color: var(--text-secondary);
  line-height: 1.6;
}

.timeline-skills {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-top: var(--space-4);
}

.timeline-skills .skill-tag {
  font-size: 0.75rem;
}

/* =================================================================
   BLOG SECTION (MERGED)
   ================================================================= */
.blog-section {
  background: var(--surface);
}

.blog-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: var(--space-8);
}

.blog-card {
  background: var(--background);
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  transition: all var(--transition-normal);
  border: 1px solid var(--border);
}

.blog-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-xl);
}

.blog-image {
  position: relative;
  height: 200px;
  overflow: hidden;
}

.blog-image img {
  width: 100%;
  height: 100%;
  -o-object-fit: cover;
     object-fit: cover;
  transition: transform var(--transition-slow);
}

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

.blog-content {
  padding: var(--space-6);
}

.blog-category {
  display: inline-block;
  padding: var(--space-1) var(--space-3);
  background: var(--primary-50);
  color: var(--primary-700);
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  margin-bottom: var(--space-4);
}

[data-theme=dark] .blog-category {
  background: rgba(14, 165, 233, 0.1);
  color: var(--primary-300);
}

.blog-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--space-3);
  line-height: 1.35;
}

.blog-excerpt {
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: var(--space-4);
}

.blog-meta {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  margin-bottom: var(--space-4);
  font-size: 0.875rem;
  color: var(--text-muted);
}

.blog-meta i {
  color: var(--primary-600);
}

.blog-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  color: var(--primary-600);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.875rem;
  padding: var(--space-2) var(--space-4);
  border: 1px solid var(--primary-200);
  border-radius: var(--radius-lg);
  transition: all var(--transition-normal);
  background: var(--primary-50);
}

.blog-link:hover {
  background: var(--primary-600);
  color: white;
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

[data-theme=dark] .blog-link {
  background: rgba(14, 165, 233, 0.1);
  color: var(--primary-400);
  border-color: rgba(14, 165, 233, 0.2);
}

[data-theme=dark] .blog-link:hover {
  background: var(--primary-600);
  color: white;
}

/* =================================================================
   CONTACT SECTION
   ================================================================= */
.contact-section {
  background: var(--background);
}

.contact-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-20);
}

.contact-info h3 {
  font-size: 2rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--space-6);
}

.contact-info p {
  font-size: 1.125rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: var(--space-8);
}

.contact-methods {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}

.contact-method {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  padding: var(--space-6);
  background: var(--surface);
  border-radius: var(--radius-xl);
  border: 1px solid var(--border);
  transition: all var(--transition-normal);
}

.contact-method:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-color: var(--primary-200);
}

.contact-method i {
  width: 50px;
  height: 50px;
  background: var(--primary-50);
  color: var(--primary-600);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  flex-shrink: 0;
}

[data-theme=dark] .contact-method i {
  background: rgba(14, 165, 233, 0.1);
}

.contact-method-info h4 {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-1);
}

.contact-method-info p {
  color: var(--text-secondary);
  margin: 0;
}

.contact-form {
  background: var(--surface);
  border-radius: var(--radius-xl);
  padding: var(--space-10);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-lg);
}

.form-group {
  margin-bottom: var(--space-6);
}

.form-group label {
  display: block;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-2);
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: var(--space-4);
  border: 2px solid var(--border);
  border-radius: var(--radius-lg);
  font-family: inherit;
  font-size: 1rem;
  background: var(--background);
  color: var(--text-primary);
  transition: all var(--transition-normal);
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--primary-500);
  box-shadow: 0 0 0 3px rgba(14, 165, 233, 0.1);
}

.form-group textarea {
  resize: vertical;
  min-height: 120px;
}

.form-submit {
  width: 100%;
  padding: var(--space-4) var(--space-6);
  background: var(--gradient-primary);
  color: white;
  border: none;
  border-radius: var(--radius-lg);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-normal);
}

.form-submit:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.form-submit:disabled {
  opacity: 0.7;
  cursor: not-allowed;
  transform: none;
}

.form-message {
  padding: var(--space-4);
  border-radius: var(--radius-lg);
  margin-bottom: var(--space-4);
  opacity: 0;
  transform: translateY(-10px);
  transition: all var(--transition-normal);
}

.form-message.show {
  opacity: 1;
  transform: translateY(0);
}

.form-message.success {
  background: rgba(16, 185, 129, 0.1);
  color: var(--accent-green);
  border-left: 4px solid var(--accent-green);
}

.form-message.error {
  background: rgba(239, 68, 68, 0.1);
  color: #ef4444;
  border-left: 4px solid #ef4444;
}

.form-message.info {
  background: rgba(14, 165, 233, 0.1);
  color: var(--primary-600);
  border-left: 4px solid var(--primary-600);
}

/* =================================================================
   CERTIFICATIONS SECTION
   ================================================================= */
.certifications-section {
  background: var(--surface);
}

.certifications-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: var(--space-8);
}

.certification-card {
  background: var(--background);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  border: 1px solid var(--border);
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.certification-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--gradient-primary);
}

.certification-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-xl);
  border-color: var(--primary-200);
}

.certification-header {
  display: flex;
  align-items: flex-start;
  gap: var(--space-4);
  margin-bottom: var(--space-6);
}

.certification-icon {
  width: 60px;
  height: 60px;
  background: var(--primary-50);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  color: var(--primary-600);
  flex-shrink: 0;
}

[data-theme=dark] .certification-icon {
  background: rgba(14, 165, 233, 0.1);
}

.certification-info h3 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--space-2);
  line-height: 1.3;
}

.certification-provider {
  color: var(--primary-600);
  font-weight: 600;
  font-size: 0.95rem;
}

.certification-date {
  color: var(--text-muted);
  font-size: 0.875rem;
  margin-top: var(--space-1);
}

.certification-description {
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: var(--space-6);
}

.certification-skills {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-bottom: var(--space-6);
}

.certification-skill {
  display: inline-block;
  padding: var(--space-1) var(--space-3);
  background: var(--primary-50);
  color: var(--primary-700);
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

[data-theme=dark] .certification-skill {
  background: rgba(14, 165, 233, 0.1);
  color: var(--primary-400);
}

.certification-actions {
  display: flex;
  gap: var(--space-3);
}

.certification-btn {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-lg);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.875rem;
  transition: all var(--transition-normal);
}

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

.certification-btn.primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.certification-btn.outline {
  background: transparent;
  color: var(--primary-600);
  border: 2px solid var(--primary-200);
}

.certification-btn.outline:hover {
  background: var(--primary-50);
  border-color: var(--primary-300);
}

[data-theme=dark] .certification-btn.outline {
  color: var(--primary-400);
  border-color: rgba(14, 165, 233, 0.3);
}

[data-theme=dark] .certification-btn.outline:hover {
  background: rgba(14, 165, 233, 0.1);
  border-color: rgba(14, 165, 233, 0.5);
}

/* =================================================================
   FOOTER
   ================================================================= */
.footer {
  background: var(--surface);
  border-top: 1px solid var(--border);
  padding: var(--space-20) 0 var(--space-8) 0;
}

.footer-content {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-12);
  margin-bottom: var(--space-12);
}

.footer-about h3 {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--space-4);
}

.footer-about p {
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: var(--space-6);
}

.footer-social {
  display: flex;
  gap: var(--space-3);
}

.footer-social .social-link {
  width: 45px;
  height: 45px;
  font-size: 1.1rem;
}

.footer-section h4 {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-4);
}

.footer-links {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-8);
}

.footer-section ul {
  list-style: none;
}

.footer-links li {
  margin-bottom: var(--space-3);
}

.footer-links a {
  color: var(--text-secondary);
  text-decoration: none;
  transition: color var(--transition-normal);
}

.footer-links a:hover {
  color: var(--primary-600);
}

.footer-bottom {
  text-align: center;
  padding-top: var(--space-8);
  border-top: 1px solid var(--border);
  color: var(--text-muted);
}

/* =================================================================
   BACK TO TOP BUTTON
   ================================================================= */
.back-to-top {
  position: fixed;
  bottom: var(--space-8);
  right: var(--space-8);
  width: 60px;
  height: 60px;
  background: var(--gradient-primary);
  color: white;
  border: none;
  border-radius: 50%;
  font-size: 1.25rem;
  cursor: pointer;
  box-shadow: var(--shadow-lg);
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: all var(--transition-normal);
  z-index: 1000;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-xl);
}

/* =================================================================
   RESPONSIVE DESIGN
   ================================================================= */
@media (max-width: 768px) {
  .mobile-menu-btn {
    display: flex;
  }
  .nav-links {
    display: none;
  }
  .nav-actions {
    gap: var(--space-2);
  }
  .hero-content {
    grid-template-columns: 1fr;
    gap: var(--space-12);
    text-align: center;
  }
  .hero-left {
    order: -1;
  }
  .hero-image {
    max-width: 300px;
  }
  .hero-photo {
    height: 400px;
  }
  .float-item {
    display: none;
  }
  .hero-stats {
    justify-content: center;
  }
  .hero-actions {
    flex-direction: column;
    align-items: center;
  }
  .about-content {
    grid-template-columns: 1fr;
    gap: var(--space-12);
  }
  .portfolio-grid {
    grid-template-columns: 1fr;
  }
  .research-grid {
    grid-template-columns: 1fr;
  }
  .startups-grid {
    grid-template-columns: 1fr;
  }
  .certifications-grid {
    grid-template-columns: 1fr;
  }
  .contact-content {
    grid-template-columns: 1fr;
    gap: var(--space-12);
  }
  .footer-content {
    grid-template-columns: 1fr;
    gap: var(--space-8);
    text-align: center;
  }
  .nav-actions {
    gap: var(--space-2);
  }
  .theme-toggle {
    width: 36px;
    height: 36px;
    font-size: 1rem;
  }
  .timeline {
    padding-left: var(--space-6);
  }
  .timeline::before {
    left: var(--space-3);
  }
  .timeline-item::before {
    left: -1.75rem;
  }
  .section {
    padding: var(--space-16) 0;
  }
  .footer-links {
    grid-template-columns: 1fr;
    text-align: center;
  }
  .footer-section ul li {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--space-2);
  }
  .footer-section ul li i {
    width: 18px;
  }
  .footer-description {
    max-width: 450px;
    margin: 0 auto;
  }
  .footer-left {
    display: flex;
    flex-direction: column;
    align-items: center;
  }
  .footer-social {
    justify-content: center;
  }
}
@media (max-width: 480px) {
  .container {
    padding: 0 var(--space-4);
  }
  .hero-photo {
    height: 350px;
  }
  .hero-image {
    max-width: 250px;
  }
  .section-title {
    font-size: 2rem;
  }
  .hero-title {
    font-size: 2.5rem;
  }
  .btn {
    padding: var(--space-3) var(--space-6);
  }
  .portfolio-grid {
    grid-template-columns: 1fr;
  }
  .back-to-top {
    bottom: var(--space-4);
    right: var(--space-4);
    width: 50px;
    height: 50px;
    font-size: 1.1rem;
  }
}
/* =================================================================
   ANIMATIONS & UTILITIES
   ================================================================= */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}
@keyframes fadeInLeft {
  from {
    opacity: 0;
    transform: translateX(-30px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}
@keyframes fadeInRight {
  from {
    opacity: 0;
    transform: translateX(30px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}
/* Animation classes */
.animate-fadeInUp {
  animation: fadeInUp 0.6s ease-out;
}

.animate-fadeInLeft {
  animation: fadeInLeft 0.6s ease-out;
}

.animate-fadeInRight {
  animation: fadeInRight 0.6s ease-out;
}

/* Utility classes */
.text-center {
  text-align: center;
}

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

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

.hidden {
  display: none;
}

.visible {
  display: block;
}

/* Smooth scrolling for all links */
html {
  scroll-behavior: smooth;
}

/* Focus styles for accessibility */
*:focus-visible {
  outline: 2px solid var(--primary-500);
  outline-offset: 2px;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
  :root {
    --border: #000000;
  }
  [data-theme=dark] {
    --border: #ffffff;
  }
}/*# sourceMappingURL=styles.css.map */