/* ===================================
   KAZI MAZID - PROFESSIONAL PORTFOLIO
   Modern Design System - 2025
   =================================== */

/* Google Fonts Import */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=Outfit:wght@600;700;800&display=swap');

/* ===================================
   CSS CUSTOM PROPERTIES
   =================================== */

:root {
  /* Color Palette - Vibrant Gradients */
  --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --gradient-secondary: linear-gradient(135deg, #00d2ff 0%, #3a7bd5 100%);
  --gradient-accent: linear-gradient(135deg, #ff6b6b 0%, #ffa500 100%);
  --gradient-hero: linear-gradient(135deg, #0a192f 0%, #1a2332 50%, #2a3447 100%);

  /* Solid Colors */
  --color-primary: #667eea;
  --color-primary-dark: #5568d3;
  --color-secondary: #00d2ff;
  --color-accent: #ff6b6b;
  --color-success: #10b981;

  /* Background Colors */
  --bg-dark: #0a192f;
  --bg-dark-secondary: #112240;
  --bg-dark-tertiary: #1a2332;
  --bg-light: #ffffff;
  --bg-light-secondary: #f8fafc;

  /* Text Colors */
  --text-primary-dark: #e2e8f0;
  --text-secondary-dark: #94a3b8;
  --text-primary-light: #1e293b;
  --text-secondary-light: #64748b;

  /* Glassmorphism */
  --glass-bg: rgba(255, 255, 255, 0.05);
  --glass-border: rgba(255, 255, 255, 0.1);
  --glass-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);

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

  /* Font Sizes */
  --fs-xs: 0.875rem;
  /* 14px */
  --fs-sm: 1rem;
  /* 16px */
  --fs-md: 1.125rem;
  /* 18px */
  --fs-lg: 1.25rem;
  /* 20px */
  --fs-xl: 1.5rem;
  /* 24px */
  --fs-2xl: 2rem;
  /* 32px */
  --fs-3xl: 2.5rem;
  /* 40px */
  --fs-4xl: 3rem;
  /* 48px */
  --fs-5xl: 4rem;
  /* 64px */
  --fs-6xl: 6rem;
  /* 96px */

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

  /* Border Radius */
  --radius-sm: 0.5rem;
  --radius-md: 1rem;
  --radius-lg: 1.5rem;
  --radius-xl: 2rem;

  /* Shadows */
  --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
  --shadow-glow: 0 0 20px rgba(102, 126, 234, 0.4);

  /* Transitions */
  --transition-fast: 200ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 400ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 800ms cubic-bezier(0.4, 0, 0.2, 1);

  /* Z-index */
  --z-dropdown: 1000;
  --z-sticky: 1020;
  --z-fixed: 1030;
  --z-modal: 1040;
  --z-tooltip: 1050;
}

/* Dark Mode Variables (default) */
body {
  --bg-primary: var(--bg-dark);
  --bg-secondary: var(--bg-dark-secondary);
  --bg-tertiary: var(--bg-dark-tertiary);
  --text-primary: var(--text-primary-dark);
  --text-secondary: var(--text-secondary-dark);
}

/* Light Mode */
body.light-mode {
  --bg-primary: var(--bg-light);
  --bg-secondary: var(--bg-light-secondary);
  --bg-tertiary: #e2e8f0;
  --text-primary: var(--text-primary-light);
  --text-secondary: var(--text-secondary-light);
  --glass-bg: rgba(0, 0, 0, 0.02);
  --glass-border: rgba(0, 0, 0, 0.05);
}

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

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

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

body {
  font-family: var(--font-body);
  font-size: var(--fs-sm);
  line-height: 1.6;
  color: var(--text-primary);
  background: var(--bg-primary);
  overflow-x: hidden;
  transition: background var(--transition-base), color var(--transition-base);
}

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

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--space-md);
  color: var(--text-primary);
}

h1 {
  font-size: var(--fs-5xl);
  font-weight: 800;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

h2 {
  font-size: var(--fs-4xl);
  font-weight: 700;
}

h3 {
  font-size: var(--fs-3xl);
  font-weight: 600;
}

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

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

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

p {
  margin-bottom: var(--space-sm);
  color: var(--text-secondary);
}

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

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

/* ===================================
   LAYOUT COMPONENTS
   =================================== */

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

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

.section-title {
  text-align: center;
  margin-bottom: var(--space-2xl);
  position: relative;
}

.section-title::after {
  content: '';
  display: block;
  width: 80px;
  height: 4px;
  background: var(--gradient-primary);
  margin: var(--space-md) auto 0;
  border-radius: var(--radius-sm);
}

/* ===================================
   HEADER & NAVIGATION
   =================================== */

.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-sticky);
  background: var(--glass-bg);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--glass-border);
  transition: all var(--transition-base);
}

.header.scrolled {
  background: rgba(10, 25, 47, 0.95);
  box-shadow: var(--shadow-lg);
}

.nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-md) 0;
}

.nav-logo {
  font-family: var(--font-heading);
  font-size: var(--fs-xl);
  font-weight: 700;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav-links {
  display: flex;
  gap: var(--space-lg);
  list-style: none;
}

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

.nav-link::before {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 2px;
  background: var(--gradient-primary);
  transition: width var(--transition-fast);
}

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

.nav-link:hover::before {
  width: 80%;
}

.theme-toggle {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  color: var(--text-primary);
  padding: var(--space-xs) var(--space-md);
  border-radius: var(--radius-md);
  cursor: pointer;
  font-size: var(--fs-sm);
  transition: all var(--transition-fast);
  backdrop-filter: blur(10px);
}

.theme-toggle:hover {
  background: var(--gradient-primary);
  color: white;
  transform: translateY(-2px);
  box-shadow: var(--shadow-glow);
}

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

.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--gradient-hero);
  position: relative;
  overflow: hidden;
  padding-top: 120px;
  padding-bottom: 120px;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background:
    radial-gradient(circle at 20% 50%, rgba(102, 126, 234, 0.1) 0%, transparent 50%),
    radial-gradient(circle at 80% 80%, rgba(0, 210, 255, 0.1) 0%, transparent 50%);
  pointer-events: none;
}

.hero-content {
  text-align: center;
  z-index: 1;
  animation: fadeInUp var(--transition-slow) ease-out;
}

.hero-image {
  width: 200px;
  height: 200px;
  border-radius: 50%;
  margin: 0 auto var(--space-xl);
  border: 4px solid transparent;
  background: var(--gradient-primary);
  padding: 4px;
  animation: float 6s ease-in-out infinite;
  box-shadow: var(--shadow-glow);
}

.hero-image img {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  object-fit: cover;
}

.hero-title {
  font-size: var(--fs-5xl);
  margin-bottom: var(--space-sm);
}

.hero-subtitle {
  font-size: var(--fs-2xl);
  color: var(--color-secondary);
  font-weight: 600;
  margin-bottom: var(--space-md);
}

.hero-description {
  font-size: var(--fs-lg);
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto var(--space-xl);
}

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

.contact-item {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  color: var(--text-secondary);
  font-size: var(--fs-sm);
}

.contact-item svg {
  width: 20px;
  height: 20px;
  color: var(--color-primary);
}

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

.btn {
  padding: var(--space-md) var(--space-xl);
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: var(--fs-md);
  cursor: pointer;
  transition: all var(--transition-fast);
  border: none;
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
}

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

.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-glow);
}

.btn-secondary {
  background: var(--glass-bg);
  color: var(--text-primary);
  border: 2px solid var(--glass-border);
  backdrop-filter: blur(10px);
}

.btn-secondary:hover {
  background: var(--gradient-secondary);
  color: white;
  border-color: transparent;
  transform: translateY(-3px);
}

/* ===================================
   GLASS CARD COMPONENT
   =================================== */

.glass-card {
  background: var(--glass-bg);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  transition: all var(--transition-base);
  box-shadow: var(--shadow-md);
}

.glass-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-xl);
  border-color: rgba(102, 126, 234, 0.3);
}

/* ===================================
   CAREER SUMMARY SECTION
   =================================== */

.career-summary {
  background: var(--bg-secondary);
}

.summary-content {
  max-width: 900px;
  margin: 0 auto;
  text-align: center;
}

.summary-text {
  font-size: var(--fs-lg);
  line-height: 1.8;
  color: var(--text-secondary);
  margin-bottom: var(--space-xl);
}

.summary-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-lg);
  margin-top: var(--space-2xl);
}

.stat-card {
  background: var(--glass-bg);
  padding: var(--space-lg);
  border-radius: var(--radius-md);
  border: 1px solid var(--glass-border);
  transition: all var(--transition-base);
}

.stat-card:hover {
  transform: scale(1.05);
  border-color: var(--color-primary);
}

.stat-number {
  font-size: var(--fs-4xl);
  font-weight: 800;
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  display: block;
  margin-bottom: var(--space-xs);
}

.stat-label {
  color: var(--text-secondary);
  font-size: var(--fs-sm);
}

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

.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-lg);
}

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

.skill-category:hover {
  transform: translateY(-5px);
  border-color: var(--color-secondary);
  box-shadow: 0 0 30px rgba(0, 210, 255, 0.2);
}

.skill-category h3 {
  color: var(--color-secondary);
  margin-bottom: var(--space-md);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.skill-list {
  list-style: none;
}

.skill-item {
  padding: var(--space-sm) 0;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.skill-item::before {
  content: '▹';
  color: var(--color-primary);
  font-size: var(--fs-lg);
}

/* ===================================
   EXPERIENCE TIMELINE
   =================================== */

.timeline {
  position: relative;
  max-width: 1000px;
  margin: 0 auto;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  width: 2px;
  height: 100%;
  background: var(--gradient-primary);
}

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

.timeline-content {
  background: var(--glass-bg);
  padding: var(--space-xl);
  border-radius: var(--radius-lg);
  border: 1px solid var(--glass-border);
  position: relative;
  width: calc(50% - 40px);
  transition: all var(--transition-base);
  backdrop-filter: blur(10px);
}

.timeline-item:nth-child(odd) .timeline-content {
  margin-left: auto;
}

.timeline-content:hover {
  transform: scale(1.02);
  border-color: var(--color-primary);
  box-shadow: var(--shadow-glow);
}

.timeline-dot {
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  width: 20px;
  height: 20px;
  background: var(--gradient-primary);
  border-radius: 50%;
  border: 4px solid var(--bg-primary);
  z-index: 1;
  top: 30px;
  box-shadow: 0 0 20px rgba(102, 126, 234, 0.6);
}

.company-name {
  font-size: var(--fs-xl);
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: var(--space-xs);
}

.job-title {
  font-size: var(--fs-lg);
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-xs);
}

.job-duration {
  font-size: var(--fs-sm);
  color: var(--text-secondary);
  margin-bottom: var(--space-md);
  font-style: italic;
}

.responsibilities-title,
.achievements-title {
  font-size: var(--fs-md);
  font-weight: 600;
  color: var(--color-secondary);
  margin-top: var(--space-md);
  margin-bottom: var(--space-sm);
}

.responsibilities-list,
.achievements-list {
  list-style: none;
  margin-left: var(--space-md);
}

.responsibilities-list li,
.achievements-list li {
  padding: var(--space-xs) 0;
  color: var(--text-secondary);
  position: relative;
  padding-left: var(--space-md);
}

.responsibilities-list li::before {
  content: '●';
  position: absolute;
  left: 0;
  color: var(--color-primary);
}

.achievements-list li::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: var(--color-success);
  font-weight: bold;
}

/* ===================================
   EDUCATION & ACTIVITIES
   =================================== */

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

.education-card {
  background: var(--glass-bg);
  padding: var(--space-xl);
  border-radius: var(--radius-lg);
  border: 1px solid var(--glass-border);
  transition: all var(--transition-base);
}

.education-card:hover {
  transform: translateY(-5px);
  border-color: var(--color-accent);
  box-shadow: 0 0 30px rgba(255, 107, 107, 0.2);
}

.education-title {
  font-size: var(--fs-xl);
  color: var(--color-accent);
  margin-bottom: var(--space-sm);
}

.activity-item {
  margin-bottom: var(--space-lg);
}

.activity-item h4 {
  color: var(--color-secondary);
  margin-bottom: var(--space-xs);
}

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

.contact-section {
  background: var(--bg-secondary);
  text-align: center;
}

.contact-info {
  max-width: 600px;
  margin: 0 auto;
}

.contact-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-lg);
  justify-content: center;
  margin-top: var(--space-xl);
}

.contact-link {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-lg);
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  transition: all var(--transition-fast);
  backdrop-filter: blur(10px);
}

.contact-link:hover {
  background: var(--gradient-primary);
  color: white;
  transform: translateY(-3px);
  box-shadow: var(--shadow-glow);
}

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

.footer {
  background: var(--bg-dark);
  padding: var(--space-xl) 0;
  text-align: center;
  border-top: 1px solid var(--glass-border);
}

.footer-text {
  color: var(--text-secondary);
  font-size: var(--fs-sm);
}

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

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

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

@keyframes float {

  0%,
  100% {
    transform: translateY(0);
  }

  50% {
    transform: translateY(-20px);
  }
}

@keyframes pulse {

  0%,
  100% {
    opacity: 1;
  }

  50% {
    opacity: 0.5;
  }
}

.fade-in {
  opacity: 0;
  animation: fadeInUp var(--transition-slow) ease-out forwards;
}

.fade-in-delay-1 {
  animation-delay: 200ms;
}

.fade-in-delay-2 {
  animation-delay: 400ms;
}

.fade-in-delay-3 {
  animation-delay: 600ms;
}

/* Scroll reveal animation */
.reveal {
  opacity: 0;
  transform: translateY(50px);
  transition: all var(--transition-slow);
}

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

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

@media (max-width: 1024px) {
  :root {
    --fs-5xl: 3rem;
    --fs-4xl: 2.5rem;
    --fs-3xl: 2rem;
  }

  .timeline::before {
    left: 30px;
  }

  .timeline-content {
    width: calc(100% - 80px);
    margin-left: 80px !important;
  }

  .timeline-dot {
    left: 30px;
  }
}

@media (max-width: 768px) {
  :root {
    --fs-5xl: 2.5rem;
    --fs-4xl: 2rem;
    --fs-3xl: 1.75rem;
    --space-3xl: 4rem;
  }

  .nav-links {
    display: none;
  }

  .hero-title {
    font-size: var(--fs-4xl);
  }

  .hero-cta {
    flex-direction: column;
  }

  .skills-grid,
  .education-grid {
    grid-template-columns: 1fr;
  }

  .summary-stats {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  :root {
    --fs-5xl: 2rem;
    --fs-4xl: 1.75rem;
    --space-lg: 1rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
  }

  .container {
    padding: 0 var(--space-md);
  }

  .hero-image {
    width: 150px;
    height: 150px;
  }

  .glass-card,
  .timeline-content,
  .education-card {
    padding: var(--space-md);
  }
}

/* ===================================
   UTILITY CLASSES
   =================================== */

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

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

.mb-sm {
  margin-bottom: var(--space-sm);
}

.mb-md {
  margin-bottom: var(--space-md);
}

.mb-lg {
  margin-bottom: var(--space-lg);
}

.mb-xl {
  margin-bottom: var(--space-xl);
}

.mt-sm {
  margin-top: var(--space-sm);
}

.mt-md {
  margin-top: var(--space-md);
}

.mt-lg {
  margin-top: var(--space-lg);
}

.mt-xl {
  margin-top: var(--space-xl);
}

/* ===================================
   LOADING SCREEN
   =================================== */

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

.loading-screen.hidden {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

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

.loading-logo {
  font-family: var(--font-heading);
  font-size: 4rem;
  font-weight: 800;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: var(--space-lg);
  animation: pulse 2s ease-in-out infinite;
}

.loading-spinner {
  width: 50px;
  height: 50px;
  margin: 0 auto;
  border: 4px solid rgba(102, 126, 234, 0.2);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

/* ===================================
   MOBILE MENU
   =================================== */

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

.mobile-menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: var(--space-xs);
  z-index: 1001;
}

.mobile-menu-toggle span {
  width: 25px;
  height: 3px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: all var(--transition-base);
}

.mobile-menu-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(8px, 8px);
}

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

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

/* ===================================
   SCROLL TO TOP BUTTON
   =================================== */

.scroll-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 50px;
  height: 50px;
  background: var(--gradient-primary);
  border: none;
  border-radius: 50%;
  color: white;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-lg);
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: all var(--transition-base);
  z-index: var(--z-fixed);
}

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

.scroll-to-top:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-glow);
}

.scroll-to-top svg {
  width: 24px;
  height: 24px;
}

/* ===================================
   RESPONSIVE DESIGN - ENHANCED
   =================================== */

@media (max-width: 1024px) {
  :root {
    --fs-5xl: 3rem;
    --fs-4xl: 2.5rem;
    --fs-3xl: 2rem;
  }

  .timeline::before {
    left: 30px;
  }

  .timeline-content {
    width: calc(100% - 80px);
    margin-left: 80px !important;
  }

  .timeline-dot {
    left: 30px;
  }
}

@media (max-width: 768px) {
  :root {
    --fs-5xl: 2.5rem;
    --fs-4xl: 2rem;
    --fs-3xl: 1.75rem;
    --space-3xl: 4rem;
  }

  /* Mobile Navigation */
  .mobile-menu-toggle {
    display: flex;
  }

  .nav-links {
    position: fixed;
    top: 0;
    right: -100%;
    width: 70%;
    max-width: 300px;
    height: 100vh;
    background: var(--bg-dark-secondary);
    flex-direction: column;
    padding: 80px 30px 30px;
    gap: var(--space-md);
    transition: right var(--transition-base);
    box-shadow: -5px 0 20px rgba(0, 0, 0, 0.3);
    z-index: 1000;
  }

  .nav-links.active {
    right: 0;
  }

  .nav-link {
    width: 100%;
    padding: var(--space-md);
    text-align: center;
    font-size: var(--fs-lg);
  }

  .hero-title {
    font-size: var(--fs-4xl);
  }

  .hero-cta {
    flex-direction: column;
  }

  .skills-grid,
  .education-grid {
    grid-template-columns: 1fr;
  }

  .summary-stats {
    grid-template-columns: 1fr 1fr;
  }

  .scroll-to-top {
    bottom: 20px;
    right: 20px;
    width: 45px;
    height: 45px;
  }
}

@media (max-width: 480px) {
  :root {
    --fs-5xl: 2rem;
    --fs-4xl: 1.75rem;
    --space-lg: 1rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
  }

  .container {
    padding: 0 var(--space-md);
  }

  .hero-image {
    width: 150px;
    height: 150px;
  }

  .glass-card,
  .timeline-content,
  .education-card {
    padding: var(--space-md);
  }

  .summary-stats {
    grid-template-columns: 1fr;
  }

  .hero-contact {
    flex-direction: column;
    align-items: center;
  }

  .contact-item {
    font-size: var(--fs-xs);
  }

  .nav-links {
    width: 85%;
  }
}

/* ===================================
   PERFORMANCE OPTIMIZATIONS
   =================================== */

/* Reduce motion for users who prefer it */
@media (prefers-reduced-motion: reduce) {

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* Print styles */
@media print {

  .header,
  .theme-toggle,
  .mobile-menu-toggle,
  .scroll-to-top,
  .loading-screen {
    display: none !important;
  }

  body {
    background: white;
    color: black;
  }
}