/* ===================================
   CSS VARIABLES & ROOT STYLES
   =================================== */
:root {
  /* Colors - Dark Theme (Default) */
  --color-primary: #00d9ff;
  --color-secondary: #0066ff;
  --color-accent: #ff00ff;
  --color-bg-primary: #0a0e27;
  --color-bg-secondary: #141b3d;
  --color-bg-card: rgba(20, 27, 61, 0.7);
  --color-text-primary: #ffffff;
  --color-text-secondary: #a0aec0;
  --color-border: rgba(0, 217, 255, 0.2);

  /* Gradients */
  --gradient-primary: linear-gradient(135deg, #0066ff 0%, #00d9ff 100%);
  --gradient-accent: linear-gradient(135deg, #ff00ff 0%, #00d9ff 100%);
  --gradient-dark: linear-gradient(180deg, #0a0e27 0%, #141b3d 100%);

  /* Glassmorphism */
  --glass-bg: rgba(20, 27, 61, 0.5);
  --glass-border: rgba(255, 255, 255, 0.1);
  --glass-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);

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

  /* Border Radius */
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;

  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;

  /* Z-index */
  --z-particles: 1;
  --z-content: 10;
  --z-navbar: 100;
  --z-floating: 999;
  --z-loading: 9999;
}

/* Light Theme Variables */
body.light-theme {
  --color-bg-primary: #f7fafc;
  --color-bg-secondary: #edf2f7;
  --color-bg-card: rgba(255, 255, 255, 0.8);
  --color-text-primary: #1a202c;
  --color-text-secondary: #4a5568;
  --glass-bg: rgba(255, 255, 255, 0.5);
}

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

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

body {
  font-family: "Rajdhani", sans-serif;
  background: var(--color-bg-primary);
  color: var(--color-text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  transition: background 0.3s ease, color 0.3s ease;
}

/* ===================================
   LOADING SPINNER
   =================================== */
.loading-spinner {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--color-bg-primary);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: var(--spacing-md);
  z-index: var(--z-loading);
  transition: opacity 0.5s ease, visibility 0.5s ease;
}

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

.spinner-circle {
  width: 60px;
  height: 60px;
  border: 4px solid var(--color-border);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

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

/* ===================================
   PARTICLE BACKGROUND
   =================================== */
#particles-container {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: var(--z-particles);
  pointer-events: none;
}

.particle {
  position: absolute;
  background: var(--color-primary);
  border-radius: 50%;
  opacity: 0.6;
  animation: float linear infinite;
}

@keyframes float {
  0% {
    transform: translateY(100vh) scale(0);
    opacity: 0;
  }
  10% {
    opacity: 0.6;
  }
  90% {
    opacity: 0.6;
  }
  100% {
    transform: translateY(-100vh) scale(1);
    opacity: 0;
  }
}

/* ===================================
   NAVIGATION BAR
   =================================== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  padding: var(--spacing-sm) 0;
  background: transparent;
  z-index: var(--z-navbar);
  transition: all var(--transition-normal);
}

.navbar.scrolled {
  background: var(--glass-bg);
  backdrop-filter: blur(10px);
  box-shadow: var(--glass-shadow);
  border-bottom: 1px solid var(--glass-border);
}

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

.logo-text {
  font-family: "Orbitron", sans-serif;
  font-size: 1.5rem;
  font-weight: 700;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

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

.nav-link {
  color: var(--color-text-primary);
  text-decoration: none;
  font-weight: 500;
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
  position: relative;
}

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

.nav-link:hover::after,
.nav-link.active::after {
  width: 80%;
}

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

.theme-toggle {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  color: var(--color-text-primary);
  width: 40px;
  height: 40px;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-normal);
}

.theme-toggle:hover {
  background: var(--color-primary);
  transform: rotate(360deg);
}

.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  z-index: 1001;
}

.hamburger span {
  width: 25px;
  height: 3px;
  background: var(--color-text-primary);
  border-radius: 3px;
  transition: all var(--transition-normal);
}

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

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

.hamburger.active span:nth-child(3) {
  transform: rotate(-45deg) translate(8px, -8px);
}

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

.hero-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: radial-gradient(circle at 50% 50%, rgba(0, 102, 255, 0.1) 0%, transparent 50%);
  z-index: 2;
}

.patna-skyline {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 200px;
  background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1200 200"><rect x="50" y="120" width="40" height="80" fill="%23141b3d" opacity="0.3"/><rect x="100" y="100" width="50" height="100" fill="%23141b3d" opacity="0.4"/><rect x="160" y="130" width="35" height="70" fill="%23141b3d" opacity="0.3"/><rect x="300" y="110" width="45" height="90" fill="%23141b3d" opacity="0.4"/><rect x="500" y="90" width="60" height="110" fill="%23141b3d" opacity="0.5"/><rect x="700" y="120" width="40" height="80" fill="%23141b3d" opacity="0.3"/><rect x="900" y="100" width="50" height="100" fill="%23141b3d" opacity="0.4"/><rect x="1000" y="130" width="35" height="70" fill="%23141b3d" opacity="0.3"/></svg>')
    no-repeat center bottom;
  background-size: cover;
  opacity: 0.5;
  z-index: 2;
}

.hero-content {
  position: relative;
  z-index: var(--z-content);
  text-align: center;
  padding: 0 var(--spacing-md);
}

.hero-title {
  font-family: "Orbitron", sans-serif;
  font-size: clamp(2rem, 5vw, 4rem);
  font-weight: 900;
  margin-bottom: var(--spacing-sm);
  line-height: 1.2;
}

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

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

@keyframes blink {
  0%,
  50% {
    opacity: 1;
  }
  51%,
  100% {
    opacity: 0;
  }
}

.hero-subtitle {
  font-size: clamp(1.2rem, 3vw, 1.8rem);
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-sm);
}

.hero-description {
  font-size: clamp(1rem, 2vw, 1.3rem);
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-lg);
}

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

.scroll-indicator {
  position: absolute;
  bottom: 30px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  color: var(--color-text-secondary);
  font-size: 0.9rem;
}

.mouse {
  width: 25px;
  height: 40px;
  border: 2px solid var(--color-primary);
  border-radius: 15px;
  display: flex;
  justify-content: center;
  padding-top: 8px;
}

.wheel {
  width: 3px;
  height: 8px;
  background: var(--color-primary);
  border-radius: 2px;
  animation: scroll 2s infinite;
}

@keyframes scroll {
  0% {
    transform: translateY(0);
    opacity: 1;
  }
  100% {
    transform: translateY(20px);
    opacity: 0;
  }
}

/* ===================================
   BUTTONS
   =================================== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: 12px 28px;
  border: none;
  border-radius: var(--radius-sm);
  font-family: "Rajdhani", sans-serif;
  font-size: 1.1rem;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.btn::before {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.2);
  transform: translate(-50%, -50%);
  transition: width 0.6s, height 0.6s;
}

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

.btn-primary {
  background: var(--gradient-primary);
  color: white;
  box-shadow: 0 4px 15px rgba(0, 102, 255, 0.4);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(0, 102, 255, 0.6);
}

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

.btn-secondary:hover {
  background: var(--color-bg-secondary);
  border-color: var(--color-primary);
}

.btn-sm {
  padding: 8px 20px;
  font-size: 1rem;
}

/* ===================================
   SECTIONS
   =================================== */
.section {
  padding: var(--spacing-xl) 0;
  position: relative;
}

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

.section-title {
  font-family: "Orbitron", sans-serif;
  font-size: clamp(2rem, 4vw, 3rem);
  margin-bottom: var(--spacing-lg);
  text-align: center;
}

.title-number {
  color: var(--color-primary);
  font-size: 0.8em;
  margin-right: var(--spacing-sm);
}

/* ===================================
   ABOUT SECTION
   =================================== */
.about-content {
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: var(--spacing-lg);
  align-items: start;
}

/* Flip Card */
.flip-card {
  perspective: 1000px;
  height: 450px;
}

.flip-card-inner {
  position: relative;
  width: 100%;
  height: 100%;
  transition: transform 0.8s;
  transform-style: preserve-3d;
}

.flip-card:hover .flip-card-inner {
  transform: rotateY(180deg);
}

.flip-card-front,
.flip-card-back {
  position: absolute;
  width: 100%;
  height: 100%;
  backface-visibility: hidden;
  border-radius: var(--radius-lg);
  background: var(--glass-bg);
  backdrop-filter: blur(10px);
  border: 1px solid var(--glass-border);
  padding: var(--spacing-md);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
}

.flip-card-back {
  transform: rotateY(180deg);
}

.profile-image {
  position: relative;
  width: 200px;
  height: 200px;
  margin-bottom: var(--spacing-md);
}

.profile-image img {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  object-fit: cover;
  border: 4px solid var(--color-primary);
}

.profile-ring {
  position: absolute;
  top: -10px;
  left: -10px;
  right: -10px;
  bottom: -10px;
  border: 2px solid var(--color-primary);
  border-radius: 50%;
  border-top-color: transparent;
  animation: rotate 3s linear infinite;
}

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

.flip-card h3 {
  font-size: 1.5rem;
  margin-bottom: var(--spacing-sm);
}

.flip-card-back p {
  color: var(--color-text-secondary);
  line-height: 1.8;
  margin-bottom: var(--spacing-md);
}

.social-links {
  display: flex;
  gap: var(--spacing-sm);
}

.social-links a {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--gradient-primary);
  color: white;
  border-radius: 50%;
  text-decoration: none;
  transition: all var(--transition-normal);
}

.social-links a:hover {
  transform: translateY(-5px) scale(1.1);
}

/* Skills */
.skill-item {
  margin: 0;              
}

.skills-container h3 {
  font-size: 1.8rem;
  margin-bottom: var(--spacing-md);
   display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px; 
}

.skill-item {
  
   margin: 0; 
}
.skill-item {
   margin-top: 8px; 
}

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

.skill-name {
  font-weight: 600;
  font-size: 1.1rem;
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.skill-name i {
  color: var(--color-primary);
  font-size: 1.3rem;
}

.skill-percentage {
  font-weight: 700;
  color: var(--color-primary);
}

.skill-bar {
  height: 12px;
  background: var(--color-bg-secondary);
  border-radius: 10px;
  overflow: hidden;
  position: relative;
}

.skill-progress {
  height: 100%;
  background: var(--gradient-primary);
  border-radius: 10px;
  width: 0;
  transition: width 1.5s ease;
  position: relative;
  overflow: hidden;
}

.skill-progress::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  bottom: 0;
  right: 0;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
  animation: shimmer 2s infinite;
}

@keyframes shimmer {
  0% {
    transform: translateX(-100%);
  }
  100% {
    transform: translateX(100%);
  }
}

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

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

.project-card {
  background: var(--glass-bg);
  backdrop-filter: blur(10px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--transition-normal);
}

.project-card:hover {
  transform: translateY(-10px);
  box-shadow: 0 20px 40px rgba(0, 217, 255, 0.3);
  border-color: var(--color-primary);
}

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

.project-carousel {
  position: relative;
  width: 100%;
  height: 100%;
}

.carousel-image {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0;
  transition: opacity var(--transition-slow);
}

.carousel-image.active {
  opacity: 1;
}

.carousel-controls {
  position: absolute;
  top: 50%;
  left: 0;
  right: 0;
  transform: translateY(-50%);
  display: flex;
  justify-content: space-between;
  padding: 0 var(--spacing-sm);
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.project-card:hover .carousel-controls {
  opacity: 1;
}

.carousel-btn {
  width: 40px;
  height: 40px;
  background: var(--glass-bg);
  backdrop-filter: blur(10px);
  border: 1px solid var(--glass-border);
  border-radius: 50%;
  color: var(--color-text-primary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

.carousel-btn:hover {
  background: var(--color-primary);
  transform: scale(1.1);
}

.carousel-indicators {
  position: absolute;
  bottom: 15px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 8px;
}

.indicator {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.5);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.indicator.active {
  background: var(--color-primary);
  width: 24px;
  border-radius: 4px;
}

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

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

.project-description {
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: var(--spacing-md);
}

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

.tech-tag {
  padding: 4px 12px;
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  color: var(--color-primary);
}

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

/* ===================================
   TIMELINE SECTION
   =================================== */
.timeline-container {
  position: relative;
  max-width: 800px;
  margin: 0 auto;
}

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

.timeline-item {
  position: relative;
  margin-bottom: var(--spacing-lg);
  display: flex;
  align-items: center;
}

.timeline-item:nth-child(odd) {
  flex-direction: row-reverse;
}

.timeline-item:nth-child(odd) .timeline-card {
  margin-left: var(--spacing-lg);
}

.timeline-item:nth-child(even) .timeline-card {
  margin-right: var(--spacing-lg);
}

.timeline-dot {
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  width: 20px;
  height: 20px;
  background: var(--color-primary);
  border: 4px solid var(--color-bg-primary);
  border-radius: 50%;
  z-index: 10;
  box-shadow: 0 0 20px var(--color-primary);
}

.timeline-card {
  flex: 1;
  background: var(--glass-bg);
  backdrop-filter: blur(10px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-md);
  transition: all var(--transition-normal);
}

.timeline-card:hover {
  transform: scale(1.05);
  box-shadow: 0 10px 30px rgba(0, 217, 255, 0.3);
  border-color: var(--color-primary);
}

.timeline-icon {
  width: 60px;
  height: 60px;
  background: var(--gradient-primary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--spacing-sm);
  font-size: 1.5rem;
  color: white;
}

.timeline-date {
  display: inline-block;
  padding: 4px 12px;
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-primary);
  border-radius: var(--radius-sm);
  color: var(--color-primary);
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
}

.timeline-card h3 {
  font-size: 1.3rem;
  margin-bottom: var(--spacing-sm);
}

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

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

.contact-content {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: var(--spacing-lg);
}

.contact-info h3 {
  font-size: 1.8rem;
  margin-bottom: var(--spacing-sm);
}

.contact-info > p {
  color: var(--color-text-secondary);
  line-height: 1.8;
  margin-bottom: var(--spacing-md);
}

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

.contact-item {
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm);
  background: var(--glass-bg);
  backdrop-filter: blur(10px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  transition: all var(--transition-normal);
}

.contact-item:hover {
  border-color: var(--color-primary);
  transform: translateX(5px);
}

.contact-item i {
  color: var(--color-primary);
  font-size: 1.5rem;
  margin-top: 4px;
}

.contact-item h4 {
  margin-bottom: 4px;
}

.contact-item p {
  color: var(--color-text-secondary);
}

.contact-form {
  background: var(--glass-bg);
  backdrop-filter: blur(10px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-md);
}

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

.form-group label {
  display: block;
  margin-bottom: var(--spacing-xs);
  font-weight: 600;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 12px;
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-text-primary);
  font-family: "Rajdhani", sans-serif;
  font-size: 1rem;
  transition: all var(--transition-normal);
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 10px rgba(0, 217, 255, 0.3);
}

.btn-submit {
  width: 100%;
}

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

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

.footer-tagline {
  color: var(--color-primary);
  font-weight: 600;
}

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

.footer-social a {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  color: var(--color-text-primary);
  border-radius: 50%;
  text-decoration: none;
  transition: all var(--transition-normal);
}

.footer-social a:hover {
  background: var(--gradient-primary);
  transform: translateY(-5px);
}

/* ===================================
   FLOATING ACTION BUTTONS
   =================================== */
.floating-buttons {
  position: fixed;
  bottom: 30px;
  right: 30px;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
  z-index: var(--z-floating);
}

.fab-button {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  text-decoration: none;
  font-size: 1.5rem;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
  transition: all var(--transition-normal);
  border: none;
  cursor: pointer;
}

.fab-button:hover {
  transform: translateY(-5px) scale(1.1);
}

.fab-button.whatsapp {
  background: #25d366;
}

.fab-button.email {
  background: var(--gradient-primary);
}

.fab-button.scroll-top {
  background: var(--glass-bg);
  backdrop-filter: blur(10px);
  border: 1px solid var(--glass-border);
  color: var(--color-text-primary);
  opacity: 0;
  visibility: hidden;
}

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

/* ===================================
   RESPONSIVE DESIGN
   =================================== */
@media (max-width: 968px) {
  .nav-menu {
    position: fixed;
    top: 0;
    right: -100%;
    width: 70%;
    height: 100vh;
    background: var(--color-bg-secondary);
    flex-direction: column;
    padding: 80px 30px 30px;
    transition: right var(--transition-normal);
    box-shadow: -5px 0 20px rgba(0, 0, 0, 0.3);
  }

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

  .hamburger {
    display: flex;
  }

  .about-content {
    grid-template-columns: 1fr;
  }

  .contact-content {
    grid-template-columns: 1fr;
  }

  .timeline-line {
    left: 30px;
  }

  .timeline-item {
    flex-direction: row !important;
  }

  .timeline-dot {
    left: 30px;
  }

  .timeline-item .timeline-card {
    margin-left: 80px !important;
    margin-right: 0 !important;
  }

  .projects-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .hero-buttons {
    flex-direction: column;
  }

  .btn {
    width: 100%;
    justify-content: center;
  }

  .floating-buttons {
    bottom: 20px;
    right: 20px;
  }

  .fab-button {
    width: 48px;
    height: 48px;
    font-size: 1.3rem;
  }
}

/* ===================================
   UTILITY CLASSES
   =================================== */
.hidden {
  display: none !important;
}

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

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

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