/* 
  Main CSS for Dr. Emmanuel Abimbola Olowookere's Website
  Created: 2025-08-17
*/

/* ===== VARIABLES ===== */
:root {
  /* Color Scheme */
  --primary-color: #0a192f; /* Dark blue - professional, tech-oriented */
  --secondary-color: #64ffda; /* Teal accent - modern, innovative */
  --text-primary: #ccd6f6; /* Light blue-gray - readable on dark backgrounds */
  --text-secondary: #8892b0; /* Muted blue-gray - for secondary text */
  --bg-primary: #0a192f; /* Dark blue background */
  --bg-secondary: #112240; /* Slightly lighter blue for sections */
  --white: #e6f1ff; /* Off-white for contrast */
  --black: #020c1b; /* Deep blue-black */
  --accent: #64ffda; /* Teal accent */
  --error: #ff6489; /* Error color */
  --success: #64ff88; /* Success color */

  /* Typography */
  --font-main: 'Roboto', 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  --font-heading: 'Montserrat', 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  --font-code: 'Fira Code', 'Courier New', monospace;
  
  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 2rem;
  --space-xl: 3rem;
  --space-xxl: 5rem;
  
  /* Border Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 16px;
  
  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;
}

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

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

body {
  font-family: var(--font-main);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  margin-bottom: var(--space-md);
  color: var(--white);
  font-weight: 600;
}

h1 {
  font-size: 2.5rem;
}

h2 {
  font-size: 2rem;
  position: relative;
  padding-bottom: var(--space-sm);
}

h2::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100px;
  height: 3px;
  background-color: var(--secondary-color);
}

h3 {
  font-size: 1.5rem;
}

h4 {
  font-size: 1.25rem;
}

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

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

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

ul, ol {
  margin-bottom: var(--space-md);
  padding-left: var(--space-lg);
}

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

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

.section {
  padding: var(--space-xxl) 0;
}

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

.section-subtitle {
  color: var(--secondary-color);
  text-transform: uppercase;
  letter-spacing: 2px;
  font-size: 0.9rem;
  margin-bottom: var(--space-xs);
}

.row {
  display: flex;
  flex-wrap: wrap;
  margin: 0 -15px;
}

.col {
  padding: 0 15px;
  flex: 1;
}

/* ===== HEADER & NAVIGATION ===== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  background-color: rgba(10, 25, 47, 0.95);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px); /* For Safari */
  z-index: 1000;
  transition: var(--transition-normal);
  padding: var(--space-md) 0;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.header.scrolled {
  box-shadow: 0 5px 20px rgba(0, 0, 0, 0.2);
  padding: var(--space-sm) 0;
  background-color: rgba(10, 25, 47, 0.98);
}

.nav-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  position: relative;
}

.logo {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--white);
  z-index: 1001; /* Ensure logo stays above mobile menu */
}

.logo span {
  color: var(--secondary-color);
}

.nav-menu {
  display: flex;
  list-style: none;
  margin: 0;
  padding: 0;
  transition: all 0.4s ease;
}

.nav-item {
  margin-left: var(--space-lg);
}

.nav-link {
  color: var(--text-primary);
  font-weight: 500;
  position: relative;
  padding: var(--space-xs) 0;
  transition: color 0.3s ease;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--secondary-color);
  transition: width 0.3s ease;
}

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

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

.hamburger {
  display: none;
  cursor: pointer;
  z-index: 1001; /* Ensure hamburger stays above mobile menu */
  width: 30px;
  height: 24px;
  position: relative;
  background: transparent;
  border: none;
  padding: 0;
}

.bar {
  display: block;
  width: 30px;
  height: 3px;
  margin: 5px 0;
  background-color: var(--white);
  transition: all 0.3s ease;
  border-radius: 3px;
}

/* Touch device specific styles */
.touch-device .nav-link {
  padding: var(--space-sm) 0;
}

/* Improved mobile menu animation */
@keyframes fadeInDown {
  from {
    opacity: 0;
    transform: translateY(-20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

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

/* ===== HERO SECTION ===== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
  padding: var(--space-xl) 0;
}

.hero-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-xl);
}

.hero-content {
  flex: 1;
  max-width: 600px;
}

.hero-image-container {
  flex: 1;
  display: flex;
  justify-content: center;
  align-items: center;
  position: relative;
}

.hero-image {
  width: 100%;
  max-width: 400px;
  height: auto;
  border-radius: var(--radius-lg);
  position: relative;
  z-index: 2;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}

.hero-image-bg {
  position: absolute;
  width: 100%;
  height: 100%;
  top: 20px;
  left: 20px;
  border: 2px solid var(--secondary-color);
  border-radius: var(--radius-lg);
  z-index: 1;
}

.hero-subtitle {
  color: var(--secondary-color);
  font-family: var(--font-code);
  margin-bottom: var(--space-md);
  font-size: 1.1rem;
}

.hero-title {
  font-size: 4rem;
  margin-bottom: var(--space-md);
  line-height: 1.1;
}

.hero-description {
  font-size: 1.25rem;
  margin-bottom: var(--space-lg);
}

.hero-cta {
  display: inline-block;
  background-color: transparent;
  color: var(--secondary-color);
  border: 1px solid var(--secondary-color);
  padding: var(--space-sm) var(--space-lg);
  border-radius: var(--radius-sm);
  font-weight: 500;
  transition: var(--transition-normal);
}

.hero-cta:hover {
  background-color: rgba(100, 255, 218, 0.1);
  transform: translateY(-3px);
}

@media (max-width: 992px) {
  .hero-container {
    flex-direction: column-reverse;
    text-align: center;
  }
  
  .hero-content {
    max-width: 100%;
  }
  
  .hero-title {
    font-size: 3.5rem;
  }
  
  .hero-description {
    margin-left: auto;
    margin-right: auto;
  }
}

@media (max-width: 768px) {
  .hero-title {
    font-size: 2.8rem;
  }
  
  .hero-image {
    max-width: 300px;
  }
}

@media (max-width: 576px) {
  .hero-title {
    font-size: 2.2rem;
  }
  
  .hero-subtitle {
    font-size: 1rem;
  }
  
  .hero-description {
    font-size: 1.1rem;
  }
  
  .hero-image {
    max-width: 250px;
  }
}

/* ===== ABOUT SECTION ===== */
.about-content {
  display: flex;
  align-items: center;
  gap: var(--space-xl);
}

.about-text {
  flex: 3;
}

.about-image {
  flex: 2;
  position: relative;
}

.about-image-wrapper {
  position: relative;
  border-radius: var(--radius-md);
  overflow: hidden;
}

.about-image-wrapper::after {
  content: '';
  position: absolute;
  top: var(--space-md);
  left: var(--space-md);
  width: 100%;
  height: 100%;
  border: 2px solid var(--secondary-color);
  border-radius: var(--radius-md);
  z-index: -1;
}

.about-image img {
  border-radius: var(--radius-md);
  filter: grayscale(100%) contrast(1.2);
  transition: var(--transition-normal);
}

.about-image:hover img {
  filter: grayscale(0%);
}

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

.about-details-item {
  display: flex;
  margin-bottom: var(--space-sm);
}

.about-details-icon {
  color: var(--secondary-color);
  margin-right: var(--space-sm);
}

/* ===== EXPERIENCE SECTION ===== */
.experience-tabs {
  display: flex;
  border-left: 2px solid var(--bg-secondary);
  margin-bottom: var(--space-lg);
}

.experience-tab {
  padding: var(--space-sm) var(--space-lg);
  cursor: pointer;
  transition: var(--transition-normal);
  color: var(--text-secondary);
  position: relative;
}

.experience-tab.active {
  color: var(--secondary-color);
}

.experience-tab::before {
  content: '';
  position: absolute;
  left: -2px;
  width: 2px;
  height: 0;
  background-color: var(--secondary-color);
  transition: var(--transition-normal);
}

.experience-tab.active::before {
  height: 100%;
}

.experience-content {
  display: none;
}

.experience-content.active {
  display: block;
}

.experience-title {
  font-size: 1.5rem;
  margin-bottom: var(--space-xs);
}

.experience-company {
  color: var(--secondary-color);
  margin-bottom: var(--space-xs);
}

.experience-duration {
  font-family: var(--font-code);
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: var(--space-md);
}

.experience-description ul {
  list-style: none;
  padding-left: 0;
}

.experience-description li {
  position: relative;
  padding-left: var(--space-lg);
  margin-bottom: var(--space-sm);
}

.experience-description li::before {
  content: '▹';
  position: absolute;
  left: 0;
  color: var(--secondary-color);
}

/* ===== SKILLS SECTION ===== */
.skills-container {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--space-lg);
}

.skill-category {
  background-color: var(--bg-secondary);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  transition: var(--transition-normal);
}

.skill-category:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

.skill-category-title {
  color: var(--secondary-color);
  margin-bottom: var(--space-md);
  font-size: 1.25rem;
}

.skill-list {
  list-style: none;
  padding-left: 0;
}

.skill-item {
  position: relative;
  padding-left: var(--space-lg);
  margin-bottom: var(--space-sm);
}

.skill-item::before {
  content: '▹';
  position: absolute;
  left: 0;
  color: var(--secondary-color);
}

/* ===== PROJECTS SECTION ===== */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--space-lg);
}

.project-card {
  background-color: var(--bg-secondary);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: var(--transition-normal);
}

.project-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

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

.project-icon {
  color: var(--secondary-color);
  font-size: 2rem;
}

.project-links a {
  margin-left: var(--space-sm);
  color: var(--text-secondary);
}

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

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

.project-title {
  margin-bottom: var(--space-sm);
  font-size: 1.25rem;
}

.project-description {
  font-size: 0.9rem;
  margin-bottom: var(--space-md);
}

.project-tech {
  display: flex;
  flex-wrap: wrap;
  list-style: none;
  padding: 0;
  margin: 0;
}

.project-tech li {
  font-family: var(--font-code);
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin-right: var(--space-md);
  margin-bottom: var(--space-xs);
}

/* ===== EDUCATION & CERTIFICATIONS SECTION ===== */
.education-timeline {
  position: relative;
  padding-left: var(--space-lg);
  border-left: 2px solid var(--bg-secondary);
}

.education-item {
  position: relative;
  margin-bottom: var(--space-lg);
  padding-left: var(--space-lg);
}

.education-item::before {
  content: '';
  position: absolute;
  left: -10px;
  top: 0;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background-color: var(--bg-secondary);
  border: 2px solid var(--secondary-color);
}

.education-date {
  font-family: var(--font-code);
  font-size: 0.9rem;
  color: var(--secondary-color);
  margin-bottom: var(--space-xs);
}

.education-degree {
  font-size: 1.25rem;
  margin-bottom: var(--space-xs);
}

.education-institution {
  color: var(--text-secondary);
  margin-bottom: var(--space-sm);
}

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

.certification-card {
  background-color: var(--bg-secondary);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  transition: var(--transition-normal);
}

.certification-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

.certification-title {
  font-size: 1.1rem;
  margin-bottom: var(--space-xs);
}

.certification-issuer {
  color: var(--secondary-color);
  font-size: 0.9rem;
  margin-bottom: var(--space-xs);
}

.certification-date {
  font-family: var(--font-code);
  font-size: 0.8rem;
  color: var(--text-secondary);
}

/* ===== CONTACT SECTION ===== */
.contact-container {
  max-width: 800px;
  margin: 0 auto;
}

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

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

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

.form-group.full {
  grid-column: span 2;
}

.form-label {
  display: block;
  margin-bottom: var(--space-xs);
  color: var(--text-secondary);
}

.form-control {
  width: 100%;
  padding: var(--space-sm) var(--space-md);
  background-color: var(--bg-secondary);
  border: 1px solid var(--text-secondary);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-family: var(--font-main);
  transition: var(--transition-normal);
}

.form-control:focus {
  outline: none;
  border-color: var(--secondary-color);
}

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

.btn {
  display: inline-block;
  background-color: transparent;
  color: var(--secondary-color);
  border: 1px solid var(--secondary-color);
  padding: var(--space-sm) var(--space-lg);
  border-radius: var(--radius-sm);
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition-normal);
}

.btn:hover {
  background-color: rgba(100, 255, 218, 0.1);
  transform: translateY(-3px);
}

.btn-submit {
  width: 100%;
}

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

.contact-info-item {
  display: flex;
  align-items: center;
  color: var(--text-secondary);
}

.contact-info-icon {
  color: var(--secondary-color);
  margin-right: var(--space-sm);
}

/* ===== FOOTER ===== */
.footer {
  background-color: var(--black);
  padding: var(--space-lg) 0;
  text-align: center;
}

.footer-social {
  display: flex;
  justify-content: center;
  list-style: none;
  padding: 0;
  margin-bottom: var(--space-md);
}

.footer-social-item {
  margin: 0 var(--space-sm);
}

.footer-social-link {
  color: var(--text-secondary);
  font-size: 1.5rem;
  transition: var(--transition-normal);
}

.footer-social-link:hover {
  color: var(--secondary-color);
  transform: translateY(-3px);
}

.footer-text {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.footer-text a {
  color: var(--secondary-color);
}

/* ===== RESPONSIVE STYLES ===== */
@media (max-width: 992px) {
  html {
    font-size: 15px;
  }
  
  .hero-title {
    font-size: 3.5rem;
  }
  
  .about-content {
    flex-direction: column;
  }
  
  .about-image {
    margin-top: var(--space-lg);
    max-width: 400px;
    align-self: center;
  }
}

@media (max-width: 768px) {
  html {
    font-size: 14px;
  }
  
  .hamburger {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
  }
  
  .hamburger.active .bar:nth-child(1) {
    transform: translateY(9px) rotate(45deg);
  }
  
  .hamburger.active .bar:nth-child(2) {
    opacity: 0;
    transform: translateX(-20px);
  }
  
  .hamburger.active .bar:nth-child(3) {
    transform: translateY(-9px) rotate(-45deg);
  }
  
  .nav-menu {
    position: fixed;
    top: 0;
    right: -100%;
    width: 80%;
    height: 100vh;
    flex-direction: column;
    background-color: var(--bg-secondary);
    text-align: left;
    transition: all 0.4s ease;
    box-shadow: -5px 0 20px rgba(0, 0, 0, 0.2);
    padding: 80px var(--space-lg) var(--space-lg);
    z-index: 1000;
    overflow-y: auto;
    justify-content: flex-start;
    align-items: flex-start;
  }
  
  .nav-menu.active {
    right: 0;
    animation: slideInRight 0.4s forwards;
  }
  
  @keyframes slideInRight {
    from {
      right: -100%;
    }
    to {
      right: 0;
    }
  }
  
  .nav-menu::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: -1;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease;
  }
  
  .nav-menu.active::before {
    opacity: 1;
    visibility: visible;
  }
  
  /* Redesigned menu items for mobile */
  .nav-item {
    margin: 0;
    width: 100%;
    position: relative;
  }
  
  .nav-link {
    display: flex;
    align-items: center;
    padding: var(--space-md) var(--space-sm);
    font-size: 1.1rem;
    font-weight: 500;
    border-radius: var(--radius-sm);
    margin-bottom: var(--space-xs);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
  }
  
  .nav-link::before {
    content: '';
    position: absolute;
    left: -5px;
    top: 0;
    height: 100%;
    width: 3px;
    background-color: var(--secondary-color);
    transform: scaleY(0);
    transition: transform 0.3s ease;
  }
  
  .nav-link::after {
    display: none;
  }
  
  .nav-link:hover,
  .nav-link.active {
    color: var(--white);
    background-color: rgba(100, 255, 218, 0.1);
    padding-left: var(--space-md);
  }
  
  .nav-link:hover::before,
  .nav-link.active::before {
    transform: scaleY(1);
  }
  
  .nav-link.active {
    color: var(--secondary-color);
  }
  
  /* Add overlay when mobile menu is active */
  body::after {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 999;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
  }
  
  body.menu-open::after {
    opacity: 1;
    visibility: visible;
  }
  
  .section {
    padding: var(--space-xl) 0;
  }
  
  .row {
    flex-direction: column;
  }
  
  .col {
    margin-bottom: var(--space-lg);
  }
  
  .contact-form {
    grid-template-columns: 1fr;
  }
  
  .form-group.full {
    grid-column: span 1;
  }
  
  /* Adjust header for mobile */
  .header {
    padding: var(--space-sm) 0;
  }
  
  .logo {
    font-size: 1.2rem;
  }
  
  /* Mobile navigation header and footer */
  .mobile-nav-header {
    padding-bottom: var(--space-md);
    margin-bottom: var(--space-md);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  }
  
  .mobile-nav-header h3 {
    font-size: 1.3rem;
    margin-bottom: var(--space-xs);
    color: var(--white);
  }
  
  .mobile-nav-header p {
    font-size: 0.9rem;
    color: var(--secondary-color);
  }
  
  .mobile-nav-footer {
    margin-top: var(--space-lg);
    padding-top: var(--space-md);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
  }
  
  .mobile-nav-footer p {
    font-size: 0.9rem;
    margin-bottom: var(--space-sm);
  }
  
  .mobile-nav-social {
    display: flex;
    gap: var(--space-md);
  }
  
  .mobile-nav-social a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background-color: rgba(255, 255, 255, 0.05);
    color: var(--text-secondary);
    transition: all 0.3s ease;
  }
  
  .mobile-nav-social a:hover {
    background-color: var(--secondary-color);
    color: var(--bg-primary);
    transform: translateY(-3px);
  }
}

@media (max-width: 576px) {
  html {
    font-size: 13px;
  }
  
  .hero-title {
    font-size: 2.5rem;
  }
  
  .hero-description {
    font-size: 1.1rem;
  }
  
  .section-title {
    font-size: 1.8rem;
  }
  
  .projects-grid,
  .skills-container,
  .certifications-grid {
    grid-template-columns: 1fr;
  }
}

/* ===== ANIMATIONS ===== */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.fade-in {
  animation: fadeIn 0.5s ease forwards;
}

.delay-1 {
  animation-delay: 0.1s;
}

.delay-2 {
  animation-delay: 0.2s;
}

.delay-3 {
  animation-delay: 0.3s;
}

.delay-4 {
  animation-delay: 0.4s;
}

.delay-5 {
  animation-delay: 0.5s;
}

/* ===== MOBILE NAVIGATION ENHANCEMENTS ===== */
/* Mobile navigation backdrop */
.mobile-nav-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.7);
  z-index: 999;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease, visibility 0.3s ease;
}

.mobile-nav-backdrop.active {
  opacity: 1;
  visibility: visible;
}

/* Mobile navigation close button */
.nav-close {
  display: none;
  position: absolute;
  top: 20px;
  right: 20px;
  width: 30px;
  height: 30px;
  cursor: pointer;
}

.nav-close::before,
.nav-close::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: var(--secondary-color);
}

.nav-close::before {
  transform: rotate(45deg);
}

.nav-close::after {
  transform: rotate(-45deg);
}

/* Mobile navigation header */
.mobile-nav-header {
  display: none;
  padding: var(--space-md);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  margin-bottom: var(--space-md);
}

/* Mobile navigation footer */
.mobile-nav-footer {
  display: none;
  padding: var(--space-md);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  margin-top: var(--space-md);
}

.mobile-nav-social {
  display: flex;
  justify-content: center;
  gap: var(--space-md);
  margin-top: var(--space-md);
}

.mobile-nav-social a {
  color: var(--text-secondary);
  font-size: 1.2rem;
  transition: var(--transition-normal);
}

.mobile-nav-social a:hover {
  color: var(--secondary-color);
}

/* Mobile navigation accessibility */
.nav-menu:focus-within {
  outline: 2px solid var(--secondary-color);
}

.nav-link:focus {
  outline: 2px solid var(--secondary-color);
  outline-offset: 2px;
}

/* Skip to content link for accessibility */
.skip-to-content {
  position: absolute;
  top: -40px;
  left: 0;
  background-color: var(--secondary-color);
  color: var(--bg-primary);
  padding: var(--space-xs) var(--space-md);
  z-index: 1001;
  transition: top 0.3s ease;
}

.skip-to-content:focus {
  top: 0;
}

@media (max-width: 768px) {
  .mobile-nav-header,
  .mobile-nav-footer,
  .nav-close {
    display: block;
  }
  
  .nav-menu {
    padding-top: 60px; /* Make room for close button */
  }
  
  /* Add animation for menu items */
  .nav-item {
    opacity: 0;
    transform: translateX(20px);
    transition: opacity 0.3s ease, transform 0.3s ease;
    transition-delay: calc(0.05s * var(--item-index, 0));
  }
  
  .nav-menu.active .nav-item {
    opacity: 1;
    transform: translateX(0);
  }
  
  /* Improve touch targets for mobile */
  .nav-link {
    padding: var(--space-md) 0;
  }
}

/* ===== UTILITY CLASSES ===== */
.text-center {
  text-align: center;
}

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

.text-accent {
  color: var(--secondary-color);
}

.mb-0 {
  margin-bottom: 0;
}

.mb-1 {
  margin-bottom: var(--space-xs);
}

.mb-2 {
  margin-bottom: var(--space-sm);
}

.mb-3 {
  margin-bottom: var(--space-md);
}

.mb-4 {
  margin-bottom: var(--space-lg);
}

.mb-5 {
  margin-bottom: var(--space-xl);
}

.mt-0 {
  margin-top: 0;
}

.mt-1 {
  margin-top: var(--space-xs);
}

.mt-2 {
  margin-top: var(--space-sm);
}

.mt-3 {
  margin-top: var(--space-md);
}

.mt-4 {
  margin-top: var(--space-lg);
}

.mt-5 {
  margin-top: var(--space-xl);
}

.d-none {
  display: none;
}

.d-block {
  display: block;
}

.d-flex {
  display: flex;
}

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

.justify-center {
  justify-content: center;
}

.justify-between {
  justify-content: space-between;
}

.w-100 {
  width: 100%;
}

.h-100 {
  height: 100%;
}