/* ===================================================================
   MODERN PORTFOLIO STYLES
   Built with industry-standard practices and responsive design
   ================================================================= */

/* CSS Variables for Theme Management */
:root {
  /* Colors */
  --primary-color: #2563eb;
  --secondary-color: #64748b;
  --accent-color: #f59e0b;
  --text-primary: #1f2937;
  --text-secondary: #6b7280;
  --text-light: #9ca3af;
  --background: #ffffff;
  --background-rgb: 255, 255, 255;
  --surface: #f8fafc;
  --surface-hover: #f1f5f9;
  --border: #e5e7eb;
  --shadow: rgba(0, 0, 0, 0.1);
  --shadow-hover: rgba(0, 0, 0, 0.15);
  
  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 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: 1.875rem;
  --font-size-4xl: 2.25rem;
  --font-size-5xl: 3rem;
  
  /* Spacing */
  --spacing-1: 0.25rem;
  --spacing-2: 0.5rem;
  --spacing-3: 0.75rem;
  --spacing-4: 1rem;
  --spacing-5: 1.25rem;
  --spacing-6: 1.5rem;
  --spacing-8: 2rem;
  --spacing-12: 3rem;
  --spacing-16: 4rem;
  --spacing-20: 5rem;
  --spacing-24: 6rem;
  
  /* Layout */
  --container-max-width: 1200px;
  --border-radius: 0.5rem;
  --border-radius-lg: 1rem;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  
  /* Z-index */
  --z-navbar: 1000;
  --z-modal: 1050;
  --z-tooltip: 1100;
}

/* Dark Mode Variables */
[data-theme="dark"] {
  --text-primary: #f9fafb;
  --text-secondary: #d1d5db;
  --text-light: #9ca3af;
  --background: #111827;
  --background-rgb: 17, 24, 39;
  --surface: #1f2937;
  --surface-hover: #374151;
  --border: #374151;
  --shadow: rgba(0, 0, 0, 0.3);
  --shadow-hover: rgba(0, 0, 0, 0.4);
}

/* ===================================================================
   BASE AND RESET STYLES
   ================================================================= */

*,
*::before,
*::after {
  box-sizing: border-box;
}

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

body {
  margin: 0;
  padding: 0;
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--background);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  margin: 0 0 var(--spacing-4) 0;
  font-weight: 600;
  line-height: 1.2;
  color: var(--text-primary);
}

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

p {
  margin: 0 0 var(--spacing-4) 0;
  color: var(--text-secondary);
}

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

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

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

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

.container {
  width: 100%;
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-6);
}

.section-title {
  text-align: center;
  margin-bottom: var(--spacing-12);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-2);
  padding: var(--spacing-3) var(--spacing-6);
  font-size: var(--font-size-base);
  font-weight: 500;
  text-decoration: none;
  border: none;
  border-radius: var(--border-radius);
  cursor: pointer;
  transition: var(--transition);
  background: transparent;
  min-width: 120px;
}

.btn i {
  font-size: 1em;
  line-height: 1;
}

.btn-primary {
  background-color: var(--primary-color);
  color: white;
  box-shadow: 0 4px 6px var(--shadow);
}

.btn-primary:hover {
  background-color: var(--accent-color);
  transform: translateY(-2px);
  box-shadow: 0 8px 12px var(--shadow-hover);
  color: white;
}

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

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

/* ===================================================================
   NAVIGATION
   ================================================================= */

.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background-color: rgba(var(--background-rgb), 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
  z-index: var(--z-navbar);
  transition: var(--transition);
}

.navbar.scrolled {
  background-color: rgba(var(--background-rgb), 0.98);
  box-shadow: 0 2px 20px var(--shadow);
}

.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--spacing-4);
  padding-bottom: var(--spacing-4);
}

.nav-brand a {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--text-primary);
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: var(--spacing-8);
}

.nav-link {
  font-weight: 500;
  color: var(--text-secondary);
  position: relative;
  padding: var(--spacing-2) 0;
}

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

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

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

.nav-toggle {
  display: none;
  flex-direction: column;
  cursor: pointer;
  gap: 4px;
}

.nav-toggle span {
  width: 25px;
  height: 3px;
  background-color: var(--text-primary);
  transition: var(--transition);
}

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

.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  background: linear-gradient(135deg, var(--surface) 0%, var(--background) 100%);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  width: 50%;
  height: 100%;
  background: linear-gradient(135deg, var(--primary-color)10, transparent);
  opacity: 0.05;
}

.hero-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-12);
  align-items: center;
  padding: var(--spacing-20) 0;
}

.hero-title {
  font-size: var(--font-size-5xl);
  font-weight: 700;
  margin-bottom: var(--spacing-4);
  background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: var(--font-size-xl);
  color: var(--text-secondary);
  margin-bottom: var(--spacing-6);
}

.hero-description {
  font-size: var(--font-size-lg);
  color: var(--text-secondary);
  margin-bottom: var(--spacing-8);
  max-width: 500px;
}

.hero-buttons {
  display: flex;
  gap: var(--spacing-4);
  flex-wrap: wrap;
}

.hero-image {
  display: flex;
  justify-content: center;
}

.profile-img {
  width: 300px;
  height: 300px;
  object-fit: cover;
  object-position: center top;
  border-radius: 50%;
  border: 8px solid white;
  box-shadow: 0 20px 40px var(--shadow);
  transition: var(--transition);
}

.profile-img:hover {
  transform: scale(1.05);
  box-shadow: 0 25px 50px var(--shadow-hover);
}

/* ===================================================================
   PARTICLE.JS OPTIMIZATION
   ================================================================= */

#particles-js {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 1;
  pointer-events: none;
}

/* Optimize particles for mobile devices */
@media (max-width: 768px) {
  #particles-js canvas {
    opacity: 0.2; /* Reduce opacity on mobile for better performance and visibility */
  }
}

@media (max-width: 1024px) {
  #particles-js canvas {
    opacity: 0.3; /* Reduce opacity on tablets */
  }
}

/* Ensure hero content is above particles */
.hero-content {
  position: relative;
  z-index: 2;
}

/* ===================================================================
   SECTIONS
   ================================================================= */

section {
  padding: var(--spacing-24) 0;
}

.about {
  background-color: var(--surface);
}

.about-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-12);
  align-items: start;
}

.about-text {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.about-text p {
  font-size: var(--font-size-lg);
  margin-bottom: var(--spacing-6);
}

.about-text .btn {
  margin-top: var(--spacing-4);
}

/* Skills Grid */
.skills-grid {
  display: grid;
  gap: var(--spacing-6);
}

.skill-category h3 {
  color: var(--primary-color);
  margin-bottom: var(--spacing-4);
  font-size: var(--font-size-lg);
}

.skill-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-2);
}

.skill-tag {
  padding: var(--spacing-2) var(--spacing-4);
  background-color: var(--background);
  color: var(--text-secondary);
  border-radius: var(--border-radius);
  font-size: var(--font-size-sm);
  font-weight: 500;
  border: 1px solid var(--border);
  transition: var(--transition);
}

.skill-tag:hover {
  background-color: var(--primary-color);
  color: white;
  transform: translateY(-2px);
}

/* ===================================================================
   PROJECTS SECTION
   ================================================================= */

.project-filters {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: var(--spacing-2);
  margin-bottom: var(--spacing-12);
}

.filter-btn {
  padding: var(--spacing-2) var(--spacing-4);
  background: transparent;
  border: 2px solid var(--border);
  border-radius: var(--border-radius);
  color: var(--text-secondary);
  cursor: pointer;
  transition: var(--transition);
  font-weight: 500;
}

.filter-btn:hover,
.filter-btn.active {
  background-color: var(--primary-color);
  color: white;
  border-color: var(--primary-color);
}

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

.project-card {
  background-color: var(--background);
  border-radius: var(--border-radius-lg);
  overflow: hidden;
  box-shadow: 0 4px 6px var(--shadow);
  transition: var(--transition);
  border: 1px solid var(--border);
}

.project-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 20px 40px var(--shadow-hover);
}

.project-image {
  position: relative;
  overflow: hidden;
  height: 200px;
  background-color: var(--surface);
}

.project-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: var(--transition);
}

.project-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(37, 99, 235, 0.9);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: var(--transition);
}

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

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

.project-links {
  display: flex;
  gap: var(--spacing-4);
}

.project-link {
  width: 50px;
  height: 50px;
  background-color: white;
  color: var(--primary-color);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-lg);
  transition: var(--transition);
}

.project-link:hover {
  background-color: var(--accent-color);
  color: white;
  transform: scale(1.1);
}

.project-content {
  padding: var(--spacing-6);
}

.project-title {
  margin-bottom: var(--spacing-3);
  color: var(--text-primary);
}

.project-description {
  margin-bottom: var(--spacing-4);
  color: var(--text-secondary);
}

.project-tech {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-2);
}

.tech-tag {
  padding: var(--spacing-1) var(--spacing-3);
  background-color: var(--surface);
  color: var(--primary-color);
  border-radius: var(--border-radius);
  font-size: var(--font-size-xs);
  font-weight: 500;
}

/* Project Card Footer */
.project-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: var(--spacing-4);
  padding-top: var(--spacing-4);
  border-top: 1px solid var(--border);
}

.project-footer .status-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-1);
}

.view-details-link {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-2);
  color: var(--primary-color);
  font-size: var(--font-size-sm);
  font-weight: 500;
  transition: var(--transition);
}

.view-details-link:hover {
  color: var(--accent-color);
  transform: translateX(4px);
}

.view-details-link i {
  transition: var(--transition);
}

.view-details-link:hover i {
  transform: translateX(4px);
}

/* ===================================================================
   EXPERIENCE SECTION
   ================================================================= */

.experience {
  background-color: var(--surface);
}

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

.timeline::before {
  content: '';
  position: absolute;
  left: 50%;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--primary-color), var(--accent-color));
  transform: translateX(-50%);
}

.timeline-item {
  position: relative;
  margin-bottom: var(--spacing-12);
  display: flex;
  align-items: center;
}

.timeline-item:nth-child(odd) {
  justify-content: flex-start;
}

.timeline-item:nth-child(even) {
  justify-content: flex-end;
}

.timeline-marker {
  position: absolute;
  left: 50%;
  width: 16px;
  height: 16px;
  background-color: var(--primary-color);
  border: 4px solid var(--background);
  border-radius: 50%;
  transform: translateX(-50%);
  z-index: 1;
}

.timeline-content {
  background-color: var(--background);
  padding: var(--spacing-6);
  border-radius: var(--border-radius-lg);
  box-shadow: 0 4px 6px var(--shadow);
  width: 45%;
  border: 1px solid var(--border);
}

.timeline-title {
  color: var(--primary-color);
  margin-bottom: var(--spacing-2);
}

.timeline-company {
  color: var(--text-secondary);
  margin-bottom: var(--spacing-2);
  font-weight: 500;
}

.timeline-date {
  color: var(--text-light);
  font-size: var(--font-size-sm);
  display: block;
  margin-bottom: var(--spacing-3);
}

.timeline-achievements {
  margin-top: var(--spacing-4);
  padding-left: var(--spacing-4);
}

.timeline-achievements li {
  color: var(--text-secondary);
  margin-bottom: var(--spacing-2);
}

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

.contact-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-12);
  align-items: start;
}

.contact-info h3 {
  color: var(--primary-color);
  margin-bottom: var(--spacing-4);
}

.contact-info p {
  margin-bottom: var(--spacing-6);
  font-size: var(--font-size-lg);
}

.contact-details {
  margin-bottom: var(--spacing-8);
}

.contact-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-3);
  margin-bottom: var(--spacing-4);
}

.contact-item i {
  color: var(--primary-color);
  font-size: var(--font-size-lg);
  width: 20px;
}

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

.social-link {
  width: 50px;
  height: 50px;
  background-color: var(--surface);
  color: var(--primary-color);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-lg);
  transition: var(--transition);
  border: 1px solid var(--border);
}

.social-link:hover {
  background-color: var(--primary-color);
  color: white;
  transform: translateY(-3px);
}

/* Contact Form */
.contact-form {
  background-color: var(--surface);
  padding: var(--spacing-8);
  border-radius: var(--border-radius-lg);
  border: 1px solid var(--border);
}

/* Additional form styles */
.field-error {
  color: #ef4444;
  font-size: var(--font-size-sm);
  margin-top: var(--spacing-1);
}

.form-group input.error,
.form-group textarea.error {
  border-color: #ef4444;
}

.form-status {
  padding: var(--spacing-3) var(--spacing-4);
  border-radius: var(--border-radius);
  margin-top: var(--spacing-4);
  font-size: var(--font-size-sm);
}

.form-status.success {
  background-color: #10b981;
  color: white;
}

.form-status.error {
  background-color: #ef4444;
  color: white;
}

/* Screen reader only text */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Theme toggle button */
.theme-toggle {
  background: none;
  border: none;
  color: var(--text-secondary);
  font-size: var(--font-size-lg);
  cursor: pointer;
  padding: var(--spacing-2);
  border-radius: var(--border-radius);
  transition: var(--transition);
}

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

/* Project placeholder for missing images */
.project-placeholder {
  height: 200px;
  background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: var(--font-size-lg);
  text-align: center;
}

.project-placeholder i {
  font-size: var(--font-size-3xl);
  margin-bottom: var(--spacing-2);
}

/* Status badges */
.status-badge {
  display: inline-block;
  padding: var(--spacing-1) var(--spacing-3);
  border-radius: var(--border-radius);
  font-size: var(--font-size-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-top: var(--spacing-2);
}

.status-completed {
  background-color: #10b981;
  color: white;
}

.status-inprogress {
  background-color: #f59e0b;
  color: white;
}

.status-planned {
  background-color: var(--text-light);
  color: white;
}

/* Enhanced timeline styles */
.timeline-location {
  color: var(--text-light);
  font-size: var(--font-size-sm);
  display: block;
  margin-bottom: var(--spacing-2);
}

.timeline-tech {
  margin-top: var(--spacing-4);
  padding-top: var(--spacing-3);
  border-top: 1px solid var(--border);
}

.timeline-tech strong {
  display: block;
  margin-bottom: var(--spacing-2);
  color: var(--text-primary);
}

/* Skip link for accessibility */
.skip-link:focus {
  position: absolute !important;
  left: 6px !important;
  top: 7px !important;
  z-index: 999999;
  padding: 8px 16px;
  background: var(--primary-color);
  color: white;
  text-decoration: none;
  border-radius: var(--border-radius);
}

/* Keyboard navigation enhancement */
/* .keyboard-navigation *:focus {
  outline: 2px solid var(--primary-color);
  outline-offset: 2px;
} */

/* Loading states */
.loading * {
  animation-play-state: paused !important;
}

.loaded .animate-on-scroll {
  animation: fadeInUp 0.6s ease forwards;
}

/* Text center utility */
.text-center {
  text-align: center;
}

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

.form-group input,
.form-group textarea {
  width: 100%;
  padding: var(--spacing-4);
  border: 2px solid var(--border);
  border-radius: var(--border-radius);
  background-color: var(--background);
  color: var(--text-primary);
  font-size: var(--font-size-base);
  transition: var(--transition);
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

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

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

.footer {
  background-color: var(--surface);
  padding: var(--spacing-8) 0;
  border-top: 1px solid var(--border);
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.footer-links {
  display: flex;
  gap: var(--spacing-4);
}

.footer-link {
  color: var(--text-secondary);
  font-size: var(--font-size-lg);
  transition: var(--transition);
}

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

/* ===================================================================
   UTILITY COMPONENTS
   ================================================================= */

/* Back to Top Button */
.back-to-top {
  position: fixed;
  bottom: var(--spacing-6);
  right: var(--spacing-6);
  width: 50px;
  height: 50px;
  background-color: var(--primary-color);
  color: white;
  border: none;
  border-radius: 50%;
  cursor: pointer;
  font-size: var(--font-size-lg);
  transition: var(--transition);
  opacity: 0;
  visibility: hidden;
  z-index: 100;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
}

.back-to-top:hover {
  background-color: var(--accent-color);
  transform: translateY(-3px);
}

/* Thank You Page */
.thank-you {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
}

.thank-you-content {
  max-width: 500px;
  padding: var(--spacing-8);
}

.thank-you-icon {
  font-size: 4rem;
  color: var(--primary-color);
  margin-bottom: var(--spacing-6);
}

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

@media (max-width: 768px) {
  .container {
    padding: 0 var(--spacing-4);
  }
  
  /* Navigation */
  .nav-menu {
    position: fixed;
    top: 70px;
    left: -100%;
    width: 100%;
    height: calc(100vh - 70px);
    background-color: var(--background);
    flex-direction: column;
    justify-content: start;
    padding-top: var(--spacing-8);
    transition: var(--transition);
    border-top: 1px solid var(--border);
  }
  
  .nav-menu.active {
    left: 0;
  }
  
  .nav-toggle {
    display: flex;
  }
  
  .nav-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
  }
  
  .nav-toggle.active span:nth-child(2) {
    opacity: 0;
  }
  
  .nav-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -6px);
  }
  
  /* Hero */
  .hero-content {
    grid-template-columns: 1fr;
    text-align: center;
    gap: var(--spacing-8);
    padding: var(--spacing-12) 0;
  }
  
  .hero-text {
    width: 100%;
    max-width: 100%;
  }
  
  .hero-title {
    font-size: var(--font-size-3xl);
    word-wrap: break-word;
    overflow-wrap: break-word;
  }
  
  .hero-subtitle {
    font-size: var(--font-size-lg);
    word-wrap: break-word;
    overflow-wrap: break-word;
  }
  
  .hero-description {
    max-width: 100%;
    font-size: var(--font-size-base);
    word-wrap: break-word;
    overflow-wrap: break-word;
    margin-left: auto;
    margin-right: auto;
  }
  
  .hero-buttons {
    justify-content: center;
  }
  
  .profile-img {
    width: 250px;
    height: 250px;
    object-position: center center; /* Better centering on mobile */
  }
  
  /* About */
  .about-content {
    grid-template-columns: 1fr;
    gap: var(--spacing-8);
  }
  
  .about-text {
    align-items: center;
    text-align: center;
  }
  
  .about-text .btn {
    width: auto;
    min-width: 200px;
  }
  
  /* Projects */
  .projects-grid {
    grid-template-columns: 1fr;
  }
  
  /* Timeline */
  .timeline::before {
    left: var(--spacing-4);
  }
  
  .timeline-item {
    justify-content: flex-start !important;
    padding-left: var(--spacing-8);
  }
  
  .timeline-marker {
    left: var(--spacing-4);
  }
  
  .timeline-content {
    width: 100%;
  }
  
  /* Contact */
  .contact-content {
    grid-template-columns: 1fr;
    gap: var(--spacing-8);
  }
  
  /* Footer */
  .footer-content {
    flex-direction: column;
    gap: var(--spacing-4);
    text-align: center;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 var(--spacing-3);
  }
  
  .hero {
    padding: var(--spacing-8) 0;
  }
  
  .hero-content {
    padding: var(--spacing-8) 0;
  }
  
  .hero-title {
    font-size: var(--font-size-2xl);
    line-height: 1.3;
    word-break: break-word;
  }
  
  .hero-subtitle {
    font-size: var(--font-size-base);
  }
  
  .hero-description {
    font-size: var(--font-size-sm);
    padding: 0 var(--spacing-2);
  }
  
  .hero-buttons {
    flex-direction: column;
    align-items: center;
    width: 100%;
  }
  
  .btn {
    width: 100%;
    max-width: 200px;
    padding: var(--spacing-3) var(--spacing-4);
  }
  
  .btn i {
    font-size: 0.9em;
  }
  
  .about-text {
    align-items: center;
  }
  
  .about-text .btn {
    width: 90%;
    max-width: 240px;
  }
  
  .profile-img {
    width: 200px;
    height: 200px;
    object-position: center 20%; /* Adjust for better head positioning on small screens */
  }
  
  .project-filters {
    gap: var(--spacing-1);
  }
  
  .filter-btn {
    padding: var(--spacing-1) var(--spacing-3);
    font-size: var(--font-size-sm);
  }
  
  .contact-form {
    padding: var(--spacing-4);
  }
}

/* ===================================================================
   ANIMATIONS AND EFFECTS
   ================================================================= */

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

@keyframes fadeInLeft {
  from {
    opacity: 0;
    transform: translateX(-30px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

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

/* Scroll animations */
.animate-on-scroll {
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.6s ease;
}

.animate-on-scroll.animated {
  opacity: 1;
  transform: translateY(0);
}

/* Loading animation */
.loading {
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 3px solid rgba(255, 255, 255, 0.3);
  border-radius: 50%;
  border-top-color: white;
  animation: spin 1s ease-in-out infinite;
}

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

/* Hover effects */
.hover-lift {
  transition: var(--transition);
}

.hover-lift:hover {
  transform: translateY(-5px);
}

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

/* button:focus,
.btn:focus {
  outline: 2px solid var(--accent-color);
} */

#typed-text {
  display: inline-block;
  min-width: 22ch; /* adjust to your longest string */
  white-space: nowrap;
}
.whatsapp-fixed {
  position: fixed;
  left: 20px;           /* Distance from left edge */
  bottom: 40px;         /* Distance from bottom edge */
  background-color: #25D366;
  color: white;
  border-radius: 50%;
  width: 60px;
  height: 60px;
  display: flex;
  justify-content: center;
  align-items: center;
  font-size: 28px;
  z-index: 1000;
  box-shadow: 0 4px 8px rgba(0,0,0,0.3);
  transition: transform 0.2s, box-shadow 0.2s;
}

/* Print styles */
@media print {
  .navbar,
  .back-to-top,
  .contact-form {
    display: none;
  }
  
  body {
    background: white;
    color: black;
  }
  
  .hero,
  section {
    page-break-inside: avoid;
  }
}

/* ===================================================================
   PROJECT DETAIL PAGE STYLES
   ================================================================= */

.project-detail-page {
  padding-top: 80px;
}

/* Back Link */
.back-link {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-2);
  color: var(--text-secondary);
  font-weight: 500;
  margin-bottom: var(--spacing-8);
  padding: var(--spacing-2) var(--spacing-4);
  border-radius: var(--border-radius);
  transition: var(--transition);
}

.back-link:hover {
  color: var(--primary-color);
  background-color: var(--surface);
  transform: translateX(-4px);
}

/* Project Hero */
.project-hero {
  background: linear-gradient(135deg, var(--surface) 0%, var(--background) 100%);
  padding: var(--spacing-12) 0 var(--spacing-16);
  position: relative;
  overflow: hidden;
}

.project-hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 70%;
  height: 200%;
  background: linear-gradient(135deg, var(--primary-color)08, transparent);
  transform: rotate(15deg);
  pointer-events: none;
}

.project-hero-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-12);
  align-items: center;
  position: relative;
  z-index: 2;
}

.project-hero-title {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 700;
  margin-bottom: var(--spacing-6);
  background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.2;
}

.project-hero-description {
  font-size: var(--font-size-lg);
  color: var(--text-secondary);
  margin-bottom: var(--spacing-6);
  line-height: 1.7;
}

.project-hero-tech {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-2);
  margin-bottom: var(--spacing-8);
}

.tech-tag-large {
  padding: var(--spacing-2) var(--spacing-4);
  background: linear-gradient(135deg, var(--primary-color)15, var(--primary-color)05);
  color: var(--primary-color);
  border-radius: var(--border-radius);
  font-size: var(--font-size-sm);
  font-weight: 500;
  border: 1px solid var(--primary-color)30;
  transition: var(--transition);
}

.tech-tag-large:hover {
  background: var(--primary-color);
  color: white;
  transform: translateY(-2px);
}

.project-hero-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-4);
  margin-bottom: var(--spacing-6);
}

.project-hero-status {
  margin-top: var(--spacing-4);
}

.status-badge-large {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-2);
  padding: var(--spacing-2) var(--spacing-4);
  border-radius: var(--border-radius);
  font-size: var(--font-size-sm);
  font-weight: 600;
}

.status-badge-large.status-completed {
  background-color: #10b98120;
  color: #10b981;
}

.status-badge-large.status-in-progress,
.status-badge-large.status-working-on-it {
  background-color: #f59e0b20;
  color: #f59e0b;
}

.status-badge-large.status-planned {
  background-color: var(--text-light)20;
  color: var(--text-light);
}

/* Project Hero Image */
.project-hero-image {
  position: relative;
}

.featured-image {
  width: 100%;
  max-height: 450px;
  object-fit: cover;
  border-radius: var(--border-radius-lg);
  box-shadow: 0 25px 50px -12px var(--shadow);
  transition: var(--transition);
}

.featured-image:hover {
  transform: translateY(-8px) scale(1.02);
  box-shadow: 0 35px 60px -15px var(--shadow-hover);
}

.project-placeholder-large {
  width: 100%;
  height: 350px;
  background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: white;
  border-radius: var(--border-radius-lg);
  font-size: var(--font-size-xl);
  gap: var(--spacing-4);
}

.project-placeholder-large i {
  font-size: 4rem;
  opacity: 0.8;
}

/* Project Details Section */
.project-details {
  padding: var(--spacing-16) 0;
  background-color: var(--background);
}

.project-details-grid {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: var(--spacing-12);
  align-items: start;
}

.project-section {
  background-color: var(--surface);
  padding: var(--spacing-8);
  border-radius: var(--border-radius-lg);
  margin-bottom: var(--spacing-8);
  border: 1px solid var(--border);
}

.project-section h2 {
  display: flex;
  align-items: center;
  gap: var(--spacing-3);
  color: var(--text-primary);
  margin-bottom: var(--spacing-6);
  font-size: var(--font-size-2xl);
}

.project-section h2 i {
  color: var(--primary-color);
}

.project-about-text {
  font-size: var(--font-size-base);
  line-height: 1.8;
  color: var(--text-secondary);
}

.project-about-text p {
  margin-bottom: var(--spacing-4);
}

/* Features List */
.features-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.features-list li {
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-3);
  padding: var(--spacing-4);
  background-color: var(--background);
  border-radius: var(--border-radius);
  margin-bottom: var(--spacing-3);
  transition: var(--transition);
}

.features-list li:hover {
  transform: translateX(8px);
  box-shadow: 0 4px 12px var(--shadow);
}

.features-list li i {
  color: #10b981;
  font-size: var(--font-size-lg);
  margin-top: 2px;
}

.features-list li span {
  color: var(--text-secondary);
  line-height: 1.6;
}

/* Challenges Section */
.challenges-list {
  display: grid;
  gap: var(--spacing-4);
}

.challenge-item {
  background-color: var(--background);
  padding: var(--spacing-6);
  border-radius: var(--border-radius);
  border-left: 4px solid var(--primary-color);
  transition: var(--transition);
}

.challenge-item:hover {
  transform: translateX(4px);
  box-shadow: 0 4px 12px var(--shadow);
}

.challenge-item h4 {
  color: var(--text-primary);
  margin-bottom: var(--spacing-2);
}

.challenge-item p {
  color: var(--text-secondary);
  margin: 0;
  line-height: 1.6;
}

/* Sidebar */
.project-sidebar {
  position: sticky;
  top: 100px;
}

.sidebar-card {
  background-color: var(--surface);
  padding: var(--spacing-6);
  border-radius: var(--border-radius-lg);
  margin-bottom: var(--spacing-6);
  border: 1px solid var(--border);
}

.sidebar-card h3 {
  display: flex;
  align-items: center;
  gap: var(--spacing-2);
  color: var(--text-primary);
  margin-bottom: var(--spacing-4);
  font-size: var(--font-size-lg);
}

.sidebar-card h3 i {
  color: var(--primary-color);
}

.sidebar-card p {
  color: var(--text-secondary);
  margin: 0;
}

.sidebar-tech-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-2);
}

.sidebar-tech-tag {
  padding: var(--spacing-1) var(--spacing-3);
  background-color: var(--background);
  color: var(--text-secondary);
  border-radius: var(--border-radius);
  font-size: var(--font-size-sm);
  border: 1px solid var(--border);
  transition: var(--transition);
}

.sidebar-tech-tag:hover {
  background-color: var(--primary-color);
  color: white;
  border-color: var(--primary-color);
}

/* ===================================================================
   PROJECT GALLERY STYLES
   ================================================================= */

.project-gallery {
  padding: var(--spacing-16) 0;
  background-color: var(--surface);
}

.gallery-title {
  text-align: center;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-3);
  margin-bottom: var(--spacing-8);
}

.gallery-title i {
  color: var(--primary-color);
}

.gallery-type-indicator {
  text-align: center;
  margin-bottom: var(--spacing-8);
}

.gallery-type-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-2);
  padding: var(--spacing-2) var(--spacing-4);
  background: linear-gradient(135deg, var(--primary-color)15, var(--accent-color)15);
  color: var(--primary-color);
  border-radius: var(--border-radius);
  font-weight: 500;
}

/* Gallery Grid - Web/Desktop Projects */
.gallery-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
  gap: var(--spacing-6);
}

/* Gallery Grid - App/Mobile Projects (Portrait Images) */
.gallery-grid.gallery-app {
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  max-width: 1000px;
  margin: 0 auto;
}

.gallery-item {
  position: relative;
  border-radius: var(--border-radius-lg);
  overflow: hidden;
  cursor: pointer;
  box-shadow: 0 4px 15px var(--shadow);
  transition: var(--transition);
  background-color: var(--background);
}

.gallery-item:hover {
  transform: translateY(-8px);
  box-shadow: 0 20px 40px var(--shadow-hover);
}

.gallery-image-wrapper {
  position: relative;
  width: 100%;
  overflow: hidden;
}

/* Standard Web Screenshot (Landscape) */
.gallery-image-wrapper img {
  width: 100%;
  height: 250px;
  object-fit: cover;
  object-position: top;
  transition: var(--transition);
}

/* Portrait/App Screenshot */
.gallery-portrait .gallery-image-wrapper img {
  height: 400px;
  object-fit: contain;
  object-position: center;
  background: linear-gradient(135deg, var(--surface) 0%, var(--background) 100%);
  padding: var(--spacing-4);
}

.gallery-item:hover .gallery-image-wrapper img {
  transform: scale(1.05);
}

.gallery-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(180deg, transparent 0%, rgba(0,0,0,0.7) 100%);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-end;
  padding: var(--spacing-6);
  opacity: 0;
  transition: var(--transition);
}

.gallery-item:hover .gallery-overlay {
  opacity: 1;
}

.gallery-zoom {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 60px;
  height: 60px;
  background-color: white;
  color: var(--primary-color);
  border: none;
  border-radius: 50%;
  font-size: var(--font-size-xl);
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
}

.gallery-zoom:hover {
  background-color: var(--primary-color);
  color: white;
  transform: translate(-50%, -50%) scale(1.1);
}

.gallery-caption {
  color: white;
  font-size: var(--font-size-sm);
  text-align: center;
  margin-top: auto;
}

/* Device Frame for App Screenshots */
.gallery-app .gallery-item {
  padding: var(--spacing-4);
  background: linear-gradient(135deg, var(--surface) 0%, var(--background) 100%);
}

.gallery-app .gallery-item::before {
  content: '';
  position: absolute;
  top: var(--spacing-2);
  left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 6px;
  background-color: var(--border);
  border-radius: 3px;
  z-index: 5;
}

.gallery-app .gallery-item::after {
  content: '';
  position: absolute;
  bottom: var(--spacing-3);
  left: 50%;
  transform: translateX(-50%);
  width: 40px;
  height: 40px;
  border: 3px solid var(--border);
  border-radius: 50%;
  z-index: 5;
}

/* ===================================================================
   LIGHTBOX STYLES
   ================================================================= */

.lightbox {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.95);
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition);
}

.lightbox.active {
  opacity: 1;
  visibility: visible;
}

.lightbox-content {
  max-width: 90vw;
  max-height: 85vh;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.lightbox-content img {
  max-width: 100%;
  max-height: 80vh;
  object-fit: contain;
  border-radius: var(--border-radius);
  animation: zoomIn 0.3s ease;
}

@keyframes zoomIn {
  from {
    transform: scale(0.8);
    opacity: 0;
  }
  to {
    transform: scale(1);
    opacity: 1;
  }
}

.lightbox-caption {
  color: white;
  margin-top: var(--spacing-4);
  font-size: var(--font-size-lg);
  text-align: center;
}

.lightbox-close,
.lightbox-prev,
.lightbox-next {
  position: absolute;
  background: transparent;
  border: none;
  color: white;
  font-size: var(--font-size-2xl);
  cursor: pointer;
  padding: var(--spacing-4);
  transition: var(--transition);
  z-index: 10;
}

.lightbox-close {
  top: var(--spacing-4);
  right: var(--spacing-4);
}

.lightbox-prev {
  left: var(--spacing-4);
  top: 50%;
  transform: translateY(-50%);
}

.lightbox-next {
  right: var(--spacing-4);
  top: 50%;
  transform: translateY(-50%);
}

.lightbox-close:hover,
.lightbox-prev:hover,
.lightbox-next:hover {
  color: var(--primary-color);
  transform: scale(1.1);
}

.lightbox-prev:hover,
.lightbox-next:hover {
  transform: translateY(-50%) scale(1.1);
}

/* Video Section */
.project-video {
  padding: var(--spacing-16) 0;
  background-color: var(--background);
}

.video-title {
  text-align: center;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-3);
  margin-bottom: var(--spacing-8);
}

.video-title i {
  color: var(--primary-color);
}

.video-wrapper {
  position: relative;
  width: 100%;
  max-width: 900px;
  margin: 0 auto;
  padding-bottom: 56.25%;
  border-radius: var(--border-radius-lg);
  overflow: hidden;
  box-shadow: 0 20px 40px var(--shadow);
}

.video-wrapper iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}

/* Related Projects */
.related-projects {
  padding: var(--spacing-16) 0;
  background-color: var(--surface);
}

.related-title {
  text-align: center;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-3);
  margin-bottom: var(--spacing-8);
}

.related-title i {
  color: var(--primary-color);
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-6);
}

.related-card {
  background-color: var(--background);
  border-radius: var(--border-radius-lg);
  overflow: hidden;
  box-shadow: 0 4px 15px var(--shadow);
  transition: var(--transition);
  text-decoration: none;
  display: block;
  border: 1px solid var(--border);
}

.related-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 20px 40px var(--shadow-hover);
}

.related-image {
  height: 180px;
  overflow: hidden;
}

.related-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: var(--transition);
}

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

.related-placeholder {
  height: 100%;
  background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: var(--font-size-3xl);
}

.related-content {
  padding: var(--spacing-6);
}

.related-content h4 {
  color: var(--text-primary);
  margin-bottom: var(--spacing-2);
}

.related-content p {
  color: var(--text-secondary);
  font-size: var(--font-size-sm);
  margin: 0;
}

/* Project CTA */
.project-cta {
  padding: var(--spacing-16) 0;
  background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
}

.cta-content {
  text-align: center;
  color: white;
}

.cta-content h2 {
  color: white;
  margin-bottom: var(--spacing-4);
}

.cta-content p {
  color: rgba(255, 255, 255, 0.9);
  font-size: var(--font-size-lg);
  margin-bottom: var(--spacing-8);
}

.cta-buttons {
  display: flex;
  justify-content: center;
  gap: var(--spacing-4);
  flex-wrap: wrap;
}

.cta-buttons .btn-primary {
  background-color: white;
  color: var(--primary-color);
}

.cta-buttons .btn-primary:hover {
  background-color: var(--surface);
  transform: translateY(-2px);
}

.cta-buttons .btn-secondary {
  border-color: white;
  color: white;
}

.cta-buttons .btn-secondary:hover {
  background-color: white;
  color: var(--primary-color);
}

/* ===================================================================
   PROJECT DETAIL RESPONSIVE STYLES
   ================================================================= */

@media (max-width: 1024px) {
  .project-details-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-8);
  }

  .project-sidebar {
    position: static;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-4);
  }

  .sidebar-card {
    margin-bottom: 0;
  }
}

@media (max-width: 768px) {
  .project-detail-page {
    padding-top: 70px;
  }

  .project-hero {
    padding: var(--spacing-8) 0 var(--spacing-12);
  }

  .project-hero-content {
    grid-template-columns: 1fr;
    text-align: center;
    gap: var(--spacing-8);
  }

  .project-hero-text {
    order: 2;
  }

  .project-hero-image {
    order: 1;
  }

  .project-hero-title {
    font-size: var(--font-size-2xl);
  }

  .project-hero-tech {
    justify-content: center;
  }

  .project-hero-buttons {
    justify-content: center;
  }

  .project-hero-status {
    display: flex;
    justify-content: center;
  }

  .featured-image {
    max-height: 300px;
  }

  .project-placeholder-large {
    height: 250px;
  }

  .project-section {
    padding: var(--spacing-6);
  }

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

  .gallery-grid.gallery-app {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-4);
  }

  .gallery-portrait .gallery-image-wrapper img {
    height: 300px;
  }

  .lightbox-content img {
    max-height: 70vh;
  }

  .lightbox-prev,
  .lightbox-next {
    padding: var(--spacing-2);
    font-size: var(--font-size-xl);
  }

  .cta-content h2 {
    font-size: var(--font-size-2xl);
  }
}

@media (max-width: 480px) {
  .back-link {
    font-size: var(--font-size-sm);
    padding: var(--spacing-1) var(--spacing-2);
  }

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

  .project-hero-description {
    font-size: var(--font-size-base);
  }

  .tech-tag-large {
    font-size: var(--font-size-xs);
    padding: var(--spacing-1) var(--spacing-3);
  }

  .project-hero-buttons {
    flex-direction: column;
    align-items: center;
    width: 100%;
  }

  .project-hero-buttons .btn {
    width: 100%;
    max-width: 250px;
  }

  .features-list li {
    padding: var(--spacing-3);
  }

  .gallery-grid.gallery-app {
    grid-template-columns: 1fr;
    max-width: 280px;
    margin: 0 auto;
  }

  .gallery-portrait .gallery-image-wrapper img {
    height: 350px;
  }

  .gallery-app .gallery-item::before,
  .gallery-app .gallery-item::after {
    display: none;
  }

  .gallery-zoom {
    width: 50px;
    height: 50px;
    font-size: var(--font-size-lg);
  }

  .cta-buttons {
    flex-direction: column;
    align-items: center;
  }

  .cta-buttons .btn {
    width: 100%;
    max-width: 250px;
  }
}