/* ================================
   PORTFOLIO WEBSITE - DESIGN SYSTEM
   Modern Dark Mode with Cyber Blue Accents
   ================================ */

/* ===== IMPORTS ===== */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap');

/* ===== CSS VARIABLES ===== */
:root {
  /* Color Palette */
  --color-bg-primary: #0A0E27;
  --color-bg-secondary: #0F1433;
  --color-bg-tertiary: #1A1F4D;
  --color-surface: rgba(26, 31, 77, 0.4);
  --color-surface-elevated: rgba(26, 31, 77, 0.6);
  
  /* Accent Colors */
  --color-accent-primary: #00D9FF;
  --color-accent-glow: rgba(0, 217, 255, 0.3);
  --color-accent-dim: rgba(0, 217, 255, 0.1);
  
  /* Text Colors */
  --color-text-primary: #FFFFFF;
  --color-text-secondary: #B8C5D6;
  --color-text-tertiary: #8B9CAF;
  --color-text-muted: #6B7A8F;
  
  /* Gradients */
  --gradient-primary: linear-gradient(135deg, #00D9FF 0%, #0066FF 100%);
  --gradient-surface: linear-gradient(135deg, rgba(0, 217, 255, 0.05) 0%, rgba(0, 102, 255, 0.05) 100%);
  --gradient-hero: linear-gradient(135deg, #0A0E27 0%, #1A1F4D 50%, #0A0E27 100%);
  
  /* Typography */
  --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 2rem;
  --font-size-4xl: 2.5rem;
  --font-size-5xl: 3.5rem;
  
  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-2xl: 4rem;
  --spacing-3xl: 6rem;
  
  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
  
  /* Shadows */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.2);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.3);
  --shadow-glow: 0 0 40px var(--color-accent-glow);
  
  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 300ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 500ms cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

body {
  font-family: var(--font-primary);
  font-size: var(--font-size-base);
  line-height: 1.6;
  color: var(--color-text-primary);
  background: var(--color-bg-primary);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ===== TYPOGRAPHY ===== */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--spacing-md);
}

h1 { font-size: var(--font-size-5xl); }
h2 { font-size: var(--font-size-4xl); }
h3 { font-size: var(--font-size-3xl); }
h4 { font-size: var(--font-size-2xl); }
h5 { font-size: var(--font-size-xl); }
h6 { font-size: var(--font-size-lg); }

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

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

a:hover {
  color: #FFFFFF;
  text-shadow: 0 0 10px var(--color-accent-glow);
}

/* ===== LAYOUT ===== */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

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

/* ===== NAVIGATION ===== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(10, 14, 39, 0.8);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(0, 217, 255, 0.1);
  transition: all var(--transition-base);
}

.navbar.scrolled {
  background: rgba(10, 14, 39, 0.95);
  box-shadow: var(--shadow-md);
}

.nav-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-md) var(--spacing-lg);
  max-width: 1200px;
  margin: 0 auto;
}

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

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

.nav-link {
  color: var(--color-text-secondary);
  font-weight: 500;
  font-size: var(--font-size-sm);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  position: relative;
  padding: var(--spacing-xs) 0;
}

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

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

.nav-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--color-text-primary);
  font-size: var(--font-size-2xl);
  cursor: pointer;
  padding: var(--spacing-xs);
}

/* ===== HERO SECTION ===== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  background: var(--gradient-hero);
  position: relative;
  overflow: hidden;
  padding-top: 80px;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 800px;
  height: 800px;
  background: radial-gradient(circle, var(--color-accent-glow) 0%, transparent 70%);
  animation: pulse 8s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { transform: scale(1); opacity: 0.3; }
  50% { transform: scale(1.2); opacity: 0.5; }
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 900px;
}

.hero-badge {
  display: inline-block;
  padding: var(--spacing-xs) var(--spacing-md);
  background: var(--color-surface);
  border: 1px solid var(--color-accent-primary);
  border-radius: var(--radius-xl);
  color: var(--color-accent-primary);
  font-size: var(--font-size-sm);
  font-weight: 600;
  margin-bottom: var(--spacing-lg);
  animation: slideDown 0.8s ease-out;
}

@keyframes slideDown {
  from {
    opacity: 0;
    transform: translateY(-20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.hero-title {
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: var(--spacing-lg);
  background: linear-gradient(135deg, #FFFFFF 0%, var(--color-accent-primary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: fadeInUp 1s ease-out 0.2s both;
}

.hero-subtitle {
  font-size: var(--font-size-xl);
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-xl);
  line-height: 1.8;
  animation: fadeInUp 1s ease-out 0.4s both;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.hero-cta {
  display: flex;
  gap: var(--spacing-md);
  flex-wrap: wrap;
  animation: fadeInUp 1s ease-out 0.6s both;
}

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

.btn-primary {
  background: var(--gradient-primary);
  color: #FFFFFF;
  box-shadow: 0 4px 20px var(--color-accent-glow);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px var(--color-accent-glow);
}

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

.btn-secondary:hover {
  background: var(--color-accent-dim);
  transform: translateY(-2px);
}

/* ===== SECTION HEADERS ===== */
.section-header {
  text-align: center;
  margin-bottom: var(--spacing-3xl);
}

.section-badge {
  display: inline-block;
  padding: var(--spacing-xs) var(--spacing-md);
  background: var(--color-surface);
  border: 1px solid var(--color-accent-primary);
  border-radius: var(--radius-xl);
  color: var(--color-accent-primary);
  font-size: var(--font-size-sm);
  font-weight: 600;
  margin-bottom: var(--spacing-md);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.section-title {
  font-size: clamp(2rem, 4vw, 3rem);
  margin-bottom: var(--spacing-md);
}

.section-description {
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
  max-width: 700px;
  margin: 0 auto;
}

/* ===== ABOUT SECTION ===== */
.about {
  background: var(--color-bg-secondary);
}

.about-content {
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: var(--spacing-3xl);
  align-items: center;
}

.about-image-wrapper {
  position: relative;
}

.about-image {
  width: 100%;
  aspect-ratio: 1;
  border-radius: var(--radius-2xl);
  background: var(--gradient-surface);
  border: 2px solid var(--color-accent-primary);
  box-shadow: 0 0 40px var(--color-accent-glow);
  object-fit: cover;
}

.about-image-placeholder {
  width: 100%;
  aspect-ratio: 1;
  border-radius: var(--radius-2xl);
  background: var(--gradient-surface);
  border: 2px solid var(--color-accent-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-3xl);
  color: var(--color-accent-primary);
}

.about-text h3 {
  color: var(--color-accent-primary);
  margin-bottom: var(--spacing-sm);
}

.about-text p {
  font-size: var(--font-size-lg);
  line-height: 1.8;
  margin-bottom: var(--spacing-lg);
}

.about-highlights {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-md);
  margin-top: var(--spacing-xl);
}

.highlight-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-md);
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  border: 1px solid rgba(0, 217, 255, 0.2);
}

.highlight-icon {
  font-size: var(--font-size-xl);
}

/* ===== EXPERTISE GRID ===== */
.expertise-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-lg);
}

.expertise-card {
  padding: var(--spacing-xl);
  background: var(--color-surface);
  border: 1px solid rgba(0, 217, 255, 0.1);
  border-radius: var(--radius-xl);
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.expertise-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-primary);
  transform: scaleX(0);
  transition: transform var(--transition-base);
}

.expertise-card:hover::before {
  transform: scaleX(1);
}

.expertise-card:hover {
  transform: translateY(-8px);
  border-color: var(--color-accent-primary);
  box-shadow: 0 8px 40px var(--color-accent-glow);
}

.expertise-icon {
  width: 60px;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--gradient-primary);
  border-radius: var(--radius-lg);
  font-size: var(--font-size-2xl);
  margin-bottom: var(--spacing-lg);
}

.expertise-card h3 {
  font-size: var(--font-size-xl);
  margin-bottom: var(--spacing-md);
}

.expertise-card p {
  color: var(--color-text-secondary);
  line-height: 1.7;
}

.expertise-card ul {
  list-style: none;
  margin-top: var(--spacing-md);
}

.expertise-card li {
  color: var(--color-text-tertiary);
  padding: var(--spacing-xs) 0;
  padding-left: var(--spacing-lg);
  position: relative;
}

.expertise-card li::before {
  content: '→';
  position: absolute;
  left: 0;
  color: var(--color-accent-primary);
  font-weight: 700;
}

/* ===== PROJECTS SECTION ===== */
.projects {
  background: var(--color-bg-secondary);
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: var(--spacing-xl);
}

.project-card {
  background: var(--color-surface);
  border: 1px solid rgba(0, 217, 255, 0.1);
  border-radius: var(--radius-xl);
  overflow: hidden;
  transition: all var(--transition-base);
  cursor: pointer;
}

.project-card:hover {
  transform: translateY(-8px);
  border-color: var(--color-accent-primary);
  box-shadow: 0 12px 40px var(--color-accent-glow);
}

.project-image {
  width: 100%;
  height: 220px;
  object-fit: cover;
  background: var(--gradient-surface);
}

.project-image-placeholder {
  width: 100%;
  height: 220px;
  background: var(--gradient-surface);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-3xl);
  color: var(--color-accent-primary);
}

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

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

.project-card h3 {
  font-size: var(--font-size-xl);
  margin-bottom: var(--spacing-xs);
}

.project-tag {
  padding: var(--spacing-xs) var(--spacing-sm);
  background: var(--color-accent-dim);
  color: var(--color-accent-primary);
  border-radius: var(--radius-md);
  font-size: var(--font-size-xs);
  font-weight: 600;
  text-transform: uppercase;
}

.project-card p {
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: var(--spacing-lg);
}

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

.tech-badge {
  padding: var(--spacing-xs) var(--spacing-sm);
  background: rgba(0, 217, 255, 0.05);
  border: 1px solid rgba(0, 217, 255, 0.2);
  border-radius: var(--radius-sm);
  font-size: var(--font-size-xs);
  color: var(--color-text-tertiary);
}

/* ===== TECH STACK ===== */
.tech-stack-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: var(--spacing-lg);
  max-width: 900px;
  margin: 0 auto;
}

.tech-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-md);
  padding: var(--spacing-xl);
  background: var(--color-surface);
  border: 1px solid rgba(0, 217, 255, 0.1);
  border-radius: var(--radius-lg);
  transition: all var(--transition-base);
}

.tech-item:hover {
  transform: translateY(-4px);
  border-color: var(--color-accent-primary);
  box-shadow: 0 4px 20px var(--color-accent-glow);
}

.tech-icon {
  font-size: var(--font-size-4xl);
  color: var(--color-accent-primary);
}

.tech-name {
  font-weight: 600;
  color: var(--color-text-primary);
  text-align: center;
}

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

.contact-container {
  max-width: 800px;
  margin: 0 auto;
}

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

.contact-intro h2 {
  font-size: var(--font-size-4xl);
  margin-bottom: var(--spacing-md);
}

.contact-intro p {
  font-size: var(--font-size-xl);
  color: var(--color-text-secondary);
}

.contact-form {
  background: var(--color-surface);
  padding: var(--spacing-2xl);
  border-radius: var(--radius-xl);
  border: 1px solid rgba(0, 217, 255, 0.1);
}

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

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

.form-input,
.form-textarea {
  width: 100%;
  padding: var(--spacing-md);
  background: var(--color-bg-secondary);
  border: 1px solid rgba(0, 217, 255, 0.2);
  border-radius: var(--radius-md);
  color: var(--color-text-primary);
  font-family: var(--font-primary);
  font-size: var(--font-size-base);
  transition: all var(--transition-base);
}

.form-input:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--color-accent-primary);
  box-shadow: 0 0 0 3px var(--color-accent-dim);
}

.form-textarea {
  resize: vertical;
  min-height: 150px;
}

.form-button {
  width: 100%;
  padding: var(--spacing-md) var(--spacing-xl);
  background: var(--gradient-primary);
  color: #FFFFFF;
  font-weight: 700;
  font-size: var(--font-size-lg);
  border: none;
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all var(--transition-base);
}

.form-button:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px var(--color-accent-glow);
}

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

.social-link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 50px;
  height: 50px;
  background: var(--color-surface);
  border: 1px solid rgba(0, 217, 255, 0.2);
  border-radius: 50%;
  color: var(--color-accent-primary);
  font-size: var(--font-size-xl);
  transition: all var(--transition-base);
}

.social-link:hover {
  background: var(--gradient-primary);
  color: #FFFFFF;
  transform: translateY(-4px);
  box-shadow: 0 4px 20px var(--color-accent-glow);
}

/* ===== FOOTER ===== */
.footer {
  background: var(--color-bg-primary);
  padding: var(--spacing-xl) 0;
  text-align: center;
  border-top: 1px solid rgba(0, 217, 255, 0.1);
}

.footer p {
  color: var(--color-text-tertiary);
  margin: 0;
}

/* ===== SCROLL ANIMATIONS ===== */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: all var(--transition-slow);
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ===== RESPONSIVE DESIGN ===== */
@media (max-width: 968px) {
  .about-content {
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
  }
  
  .about-image-wrapper {
    max-width: 400px;
    margin: 0 auto;
  }
  
  .expertise-grid {
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  }
  
  .projects-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .nav-menu {
    position: fixed;
    top: 70px;
    left: -100%;
    flex-direction: column;
    width: 100%;
    background: rgba(10, 14, 39, 0.98);
    backdrop-filter: blur(20px);
    padding: var(--spacing-xl);
    gap: var(--spacing-lg);
    transition: left var(--transition-base);
    border-bottom: 1px solid rgba(0, 217, 255, 0.1);
  }
  
  .nav-menu.active {
    left: 0;
  }
  
  .nav-toggle {
    display: block;
  }
  
  .hero {
    min-height: 90vh;
  }
  
  .hero-title {
    font-size: 2.5rem;
  }
  
  .hero-cta {
    flex-direction: column;
  }
  
  .btn {
    width: 100%;
    justify-content: center;
  }
  
  section {
    padding: var(--spacing-2xl) 0;
  }
  
  .section-header {
    margin-bottom: var(--spacing-xl);
  }
}

@media (max-width: 480px) {
  :root {
    --font-size-5xl: 2.5rem;
    --font-size-4xl: 2rem;
    --font-size-3xl: 1.75rem;
  }
  
  .container {
    padding: 0 var(--spacing-md);
  }
  
  .expertise-grid,
  .tech-stack-grid {
    grid-template-columns: 1fr;
  }
  
  .contact-form {
    padding: var(--spacing-lg);
  }
}


/* ===== PROJECT ENHANCEMENTS ===== */
.project-problem, .project-solution, .project-result {
  font-size: var(--font-size-sm);
  line-height: 1.7;
  margin-bottom: var(--spacing-md);
}

.project-problem { color: var(--color-text-secondary); }
.project-solution { color: var(--color-text-secondary); }
.project-result { 
  color: var(--color-text-primary);
  border-left: 3px solid var(--color-accent-primary);
  padding-left: var(--spacing-md);
}

.project-cta {
  margin-top: var(--spacing-md);
  padding-top: var(--spacing-md);
  border-top: 1px solid rgba(0, 217, 255, 0.1);
}

.btn-outline-small {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: var(--font-size-sm);
  font-weight: 600;
  border: 2px solid var(--color-accent-primary);
  border-radius: var(--radius-md);
  color: var(--color-accent-primary);
  background: transparent;
  text-decoration: none;
  transition: all var(--transition-base);
}

.btn-outline-small:hover {
  background: var(--color-accent-dim);
  transform: translateY(-2px);
  box-shadow: 0 4px 15px var(--color-accent-glow);
}

/* ===== TESTIMONIALS ===== */
.testimonials {
  background: var(--color-bg-primary);
}

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

.testimonial-card {
  padding: var(--spacing-xl);
  background: var(--color-surface);
  border: 1px solid rgba(0, 217, 255, 0.1);
  border-radius: var(--radius-xl);
  transition: all var(--transition-base);
}

.testimonial-card:hover {
  transform: translateY(-4px);
  border-color: var(--color-accent-primary);
  box-shadow: 0 8px 30px var(--color-accent-glow);
}

.quote-icon {
  font-size: var(--font-size-4xl);
  color: var(--color-accent-primary);
  opacity: 0.3;
  line-height: 0.5;
  margin-bottom: var(--spacing-md);
}

.testimonial-text {
  font-size: var(--font-size-base);
  line-height: 1.8;
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-lg);
}

.testimonial-author {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

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

.testimonial-author strong {
  display: block;
  color: var(--color-text-primary);
  font-weight: 600;
  margin-bottom: 2px;
}

.testimonial-author span {
  display: block;
  font-size: var(--font-size-sm);
  color: var(--color-text-tertiary);
}

/* ===== SCROLL TO TOP BUTTON ===== */
.scroll-top-btn {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 50px;
  height: 50px;
  background: var(--gradient-primary);
  color: #FFFFFF;
  border: none;
  border-radius: 50%;
  font-size: var(--font-size-xl);
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-base);
  z-index: 999;
  box-shadow: 0 4px 20px var(--color-accent-glow);
}

.scroll-top-btn.visible {
  opacity: 1;
  visibility: visible;
}

.scroll-top-btn:hover {
  transform: translateY(-4px);
  box-shadow: 0 6px 30px var(--color-accent-glow);
}

/* ===== READING PROGRESS BAR ===== */
.reading-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: rgba(0, 217, 255, 0.1);
  z-index: 1001;
}

.progress-bar {
  height: 100%;
  background: var(--gradient-primary);
  width: 0%;
  transition: width 0.1s ease-out;
}

/* ===== ENHANCED HOVER EFFECTS ===== */
.expertise-icon {
  transition: transform var(--transition-slow);
}

.expertise-card:hover .expertise-icon {
  transform: rotateY(360deg);
  animation: icon-bounce 0.6s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

@keyframes icon-bounce {
  0%, 100% { transform: rotateY(0deg) scale(1); }
  50% { transform: rotateY(180deg) scale(1.1); }
}

/* ===== ACCESSIBILITY IMPROVEMENTS ===== */
a:focus, button:focus, input:focus, textarea:focus {
  outline: 3px solid var(--color-accent-primary);
  outline-offset: 4px;
}

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