/* CSS Variables */
:root {
  --primary-color: #0d1b2a;
  --secondary-color: #1c2f4a;
  --accent-color: #f39c12;
  --text-light: #e2e2e2;
  --bg-gradient: linear-gradient(180deg, #f1f3f6 0%, #e4e7ec 100%);
  --card-shadow: 0 4px 20px rgba(0,0,0,0.1);
  --hover-transform: translateY(-8px);
  --success-color: #28a745;
  --error-color: #dc3545;
}

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

body {
  font-family: 'Inter', 'Poppins', sans-serif;
  background: var(--bg-gradient);
  background-attachment: fixed;
  color: #222;
  scroll-behavior: smooth;
  line-height: 1.6;
}

/* Navigation styles */
.navbar {
  background: rgba(13, 27, 42, 0.95) !important;
  backdrop-filter: blur(10px);
  transition: all 0.3s ease;
  padding: 1rem 0;
}

.navbar-scrolled {
  background: rgba(13, 27, 42, 1) !important;
  box-shadow: 0 2px 20px rgba(0,0,0,0.2);
}

.navbar-toggler {
  border: 2px solid rgba(255, 255, 255, 0.8) !important;
  border-radius: 8px;
  padding: 8px 12px;
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(10px);
}

.navbar-toggler:focus {
  box-shadow: 0 0 0 0.25rem rgba(255, 255, 255, 0.25);
  border-color: #fff !important;
}

.navbar-toggler-icon {
  background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba%28255, 255, 255, 1%29' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='m4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e") !important;
  width: 20px;
  height: 20px;
}

.navbar-brand {
  color: #fff !important;
  font-size: 1.8rem;
  font-weight: 700;
  letter-spacing: 2px;
  position: relative;
}

.brand-text {
  font-family: 'JetBrains Mono', monospace;
  font-weight: 800;
  font-size: 1.3rem;
  color: #ffffff !important;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  transition: color 0.3s ease, transform 0.3s ease;
}

.brand-text::after {
  content: ' | Portfolio';
  font-weight: 500;
  font-size: 0.7rem;
  letter-spacing: 1px;
  text-transform: none;
}

.brand-text:hover {
  color: var(--accent-color) !important;
  transform: scale(1.05);
}

.brand-full {
  display: inline;
  font-size: 0.9rem;
}

.brand-short {
  display: none;
}

.navbar-brand::after {
  content: '';
  position: absolute;
  bottom: -5px;
  left: 50%;
  width: 0;
  height: 2px;
  background: var(--accent-color);
  transition: all 0.3s ease;
  transform: translateX(-50%);
}

.navbar-brand:hover::after {
  width: 100%;
}

.nav-link {
  color: #fff !important;
  margin: 0 15px;
  font-weight: 500;
  position: relative;
  transition: all 0.3s ease;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -5px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent-color);
  transition: width 0.3s ease;
}

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

/* Hero section styles */
.hero {
  text-align: center;
  padding: 120px 20px 80px;
  background: linear-gradient(135deg, #0d1b2a 0%, #1c2f4a 25%, #2c3e50 50%, #34495e 75%, #2c3e50 100%);
  color: white;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: 
    radial-gradient(circle at 20% 50%, rgba(243, 156, 18, 0.1) 0%, transparent 50%),
    radial-gradient(circle at 80% 20%, rgba(52, 152, 219, 0.1) 0%, transparent 50%),
    radial-gradient(circle at 40% 80%, rgba(155, 89, 182, 0.1) 0%, transparent 50%),
    linear-gradient(45deg, transparent 30%, rgba(255,255,255,0.02) 50%, transparent 70%);
  animation: gradientShift 15s ease-in-out infinite;
  z-index: 0;
  pointer-events: none;
}

.hero::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100" fill="none"><circle cx="20" cy="20" r="1" fill="rgba(255,255,255,0.1)"/><circle cx="80" cy="40" r="0.5" fill="rgba(255,255,255,0.15)"/><circle cx="40" cy="60" r="1.5" fill="rgba(255,255,255,0.1)"/><circle cx="90" cy="80" r="1" fill="rgba(255,255,255,0.1)"/><circle cx="10" cy="90" r="0.8" fill="rgba(255,255,255,0.1)"/></svg>') repeat;
  background-size: 200px 200px;
  animation: float 25s ease-in-out infinite;
  opacity: 0.6;
  z-index: 0;
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.hero h1 {
  font-weight: 700;
  font-size: 3.5rem;
  margin-bottom: 40px;
  background: linear-gradient(45deg, #fff, #e67e22, #f39c12);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero h3 {
  color: var(--text-light);
  font-size: 2rem;
  margin-bottom: 20px;
  font-weight: 500;
}

.hero p {
  max-width: 800px;
  margin: 25px auto;
  font-size: 1.2rem;
  color: #ccc;
  line-height: 1.8;
}

/* Typing animation styles */
.typing-wrapper {
  min-height: 60px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 40px;
  width: 100%;
  padding: 0 20px;
}

.typing-text {
  display: inline-block;
  text-align: center;
  font-size: 2rem;
  font-weight: 500;
  color: var(--text-light);
  white-space: nowrap;
}

.typing-text::after {
  content: '';
  display: inline-block;
  width: 2px;
  height: 1.2em;
  background: var(--accent-color);
  margin-left: 2px;
  vertical-align: middle;
  animation: blink 1s infinite;
}

/* Animations */
@keyframes gradientShift {
  0%, 100% { 
    filter: hue-rotate(0deg) brightness(1);
  }
  33% { 
    filter: hue-rotate(10deg) brightness(1.1);
  }
  66% { 
    filter: hue-rotate(-10deg) brightness(0.95);
  }
}

@keyframes float {
  0%, 100% { transform: translateX(0px) translateY(0px); }
  33% { transform: translateX(30px) translateY(-20px); }
  66% { transform: translateX(-20px) translateY(10px); }
}

@keyframes blink {
  0%, 49% { opacity: 1; }
  50%, 100% { opacity: 0; }
}

@keyframes slideIn {
  from { opacity: 0; transform: translateY(-10px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* Button styles */
.btn-hero {
  background: transparent;
  color: #fff;
  border: 2px solid #fff;
  font-weight: 600;
  padding: 12px 30px;
  border-radius: 50px;
  text-decoration: none;
  transition: all 0.4s ease;
  margin: 10px;
  display: inline-block;
  position: relative;
  overflow: hidden;
}

.btn-hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
  transition: left 0.5s;
}

.btn-hero:hover::before { left: 100%; }

.btn-hero:hover {
  background: #fff;
  color: var(--primary-color);
  transform: translateY(-3px);
  box-shadow: 0 10px 30px rgba(255,255,255,0.3);
}

.btn-custom {
  background: var(--primary-color);
  color: #fff;
  font-weight: 600;
  padding: 10px 25px;
  border-radius: 25px;
  text-decoration: none;
  transition: all 0.3s ease;
  margin: 5px;
  border: none;
  display: inline-block;
  position: relative;
  overflow: hidden;
}

.btn-custom:hover {
  background: #1a252f;
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(0,0,0,0.3);
}

/* Case Study button styles */
.btn-outline-primary {
  color: var(--primary-color);
  border: 2px solid var(--primary-color);
  background: transparent;
  font-weight: 600;
  padding: 10px 20px;
  border-radius: 25px;
  text-decoration: none;
  transition: all 0.3s ease;
  display: inline-block;
  margin: 5px;
}

.btn-outline-primary:hover {
  background: var(--primary-color);
  color: #f7d3d3c2;
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(13, 27, 42, 0.3);
  border-color: var(--primary-color);
}

.btn-outline-primary:focus {
  box-shadow: 0 0 0 0.25rem rgba(13, 27, 42, 0.25);
  border-color: var(--primary-color);
}

/* Section container styles */
.section-container {
  border-radius: 20px;
  padding: 40px 30px;
  margin: 40px auto;
  max-width: 1400px;
  box-shadow: var(--card-shadow);
  background: #fff;
  position: relative;
  overflow: hidden;
}

.section-container::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, var(--primary-color), var(--accent-color), var(--primary-color));
}

.section-container h2 {
  font-weight: 700;
  margin-bottom: 30px;
  position: relative;
  display: inline-block;
  color: var(--primary-color);
}

.section-container h2::after {
  content: '';
  position: absolute;
  bottom: -10px;
  left: 0;
  width: 50px;
  height: 3px;
  background: var(--accent-color);
  border-radius: 2px;
}

/* Skills section styles */
#skills .skill-card {
  margin-bottom: 30px;
  padding: 30px 25px;
  background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
  border-radius: 15px;
  border: 2px solid #dee2e6;
  box-shadow: 0 4px 15px rgba(0,0,0,0.08);
  transition: all 0.3s ease;
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  height: 100%;
}

#skills .skill-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 8px 25px rgba(0,0,0,0.15);
  border-color: var(--accent-color);
}

#skills h5 {
  font-weight: 700;
  font-size: 1.3rem;
  color: var(--primary-color);
  margin-bottom: 20px;
  padding-bottom: 10px;
  border-bottom: 3px solid var(--accent-color);
  text-align: center;
  position: relative;
}

#skills h5::before {
  content: '';
  position: absolute;
  bottom: -3px;
  left: 50%;
  transform: translateX(-50%);
  width: 40px;
  height: 3px;
  background: var(--primary-color);
  border-radius: 2px;
}

.badge-skill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  color: #fff;
  padding: 12px 20px;
  border-radius: 30px;
  font-size: 0.95rem;
  margin: 6px;
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.badge-skill::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
  transition: left 0.5s;
}

.badge-skill:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(0,0,0,0.2);
}

.badge-skill:hover::before { left: 100%; }

/* Project preview styles */
.project-preview {
  width: 100%;
  height: 200px;
  object-fit: cover;
  object-position: center top;
  border-radius: 15px;
  margin-bottom: 15px;
  box-shadow: 0 4px 10px rgba(0,0,0,0.1);
  transition: transform 0.3s ease;
}

.project-preview:hover { transform: scale(1.02); }

.project-fallback-icon {
  width: 100%;
  height: 200px;
  background: linear-gradient(135deg, #f8f9fa, #e9ecef);
  border-radius: 15px;
  margin-bottom: 15px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 4rem;
  color: var(--primary-color);
  opacity: 0.6;
}

/* Card styles */
.card {
  border-radius: 20px;
  border: none;
  transition: all 0.4s ease;
  background: #fff;
  box-shadow: 0 5px 15px rgba(0,0,0,0.1);
  overflow: hidden;
  position: relative;
  height: 100%;
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, var(--accent-color), var(--primary-color));
  transform: scaleX(0);
  transition: transform 0.3s ease;
}

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

.card:hover {
  transform: var(--hover-transform);
  box-shadow: 0 15px 40px rgba(0,0,0,0.2);
}

/* Education card styles */
.education-card {
  display: flex;
  align-items: center;
  gap: 25px;
  padding: 25px;
  margin-bottom: 25px;
  border-radius: 15px;
  border: 2px solid #e9ecef;
  background: #fff;
  box-shadow: 0 4px 15px rgba(0,0,0,0.08);
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.education-card::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  width: 4px;
  height: 100%;
  background: var(--accent-color);
  transform: scaleY(0);
  transition: transform 0.3s ease;
}

.education-card:hover::before { transform: scaleY(1); }

.education-card:hover {
  transform: translateX(10px);
  border-color: var(--accent-color);
  box-shadow: 0 8px 25px rgba(0,0,0,0.12);
}

.education-card img { width: 70px; height: auto; border-radius: 10px; }

.education-info h5 {
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--primary-color);
}

.gpa-badge {
  display: inline-block;
  background: linear-gradient(45deg, var(--accent-color), #e67e22);
  color: #fff;
  font-weight: 600;
  padding: 8px 16px;
  border-radius: 20px;
  margin: 8px 0;
  box-shadow: 0 3px 10px rgba(243, 156, 18, 0.3);
}

/* Experience card styles */
.experience-card {
  padding: 20px;
  margin-bottom: 25px;
  position: relative;
}

.experience-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
}

.experience-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 15px 40px rgba(0,0,0,0.15);
}

.date-badge {
  background: #000 !important;
  color: #fff !important;
  padding: 8px 16px;
  border-radius: 20px;
  font-weight: 600;
  font-size: 0.9rem;
}

/* Reviews carousel styles */
.carousel-fixed {
  max-width: 800px;
  margin: 30px auto;
  border-radius: 20px;
  background: #fff;
  border: none;
  box-shadow: var(--card-shadow);
  overflow: hidden;
}

.review-slide {
  padding: 40px 30px;
  text-align: center;
  background: linear-gradient(135deg, #f8f9fa, #e9ecef);
}

.review-top {
  font-weight: 600;
  margin-bottom: 15px;
  color: var(--primary-color);
  font-size: 1.1rem;
}

.review-mid {
  font-style: italic;
  font-size: 1.1rem;
  color: #555;
  line-height: 1.6;
  margin-bottom: 20px;
}

.stars { color: #ffd700; font-size: 1.5rem; margin: 10px 0; }

/* Contact form styles */
.contact-form {
  background: #fff;
  padding: 30px;
  border-radius: 15px;
  box-shadow: var(--card-shadow);
  position: relative;
}

.form-control {
  border-radius: 10px;
  border: 2px solid #e9ecef;
  padding: 12px;
  transition: all 0.3s ease;
}

.form-control:focus {
  border-color: var(--accent-color);
  box-shadow: 0 0 0 0.2rem rgba(243, 156, 18, 0.25);
}

.form-notification {
  padding: 15px;
  border-radius: 10px;
  margin-bottom: 20px;
  font-weight: 500;
  display: none;
  animation: slideIn 0.3s ease-out;
}

.form-notification.success {
  background-color: #d4edda;
  color: #155724;
  border: 1px solid #c3e6cb;
}

.form-notification.error {
  background-color: #f8d7da;
  color: #721c24;
  border: 1px solid #f5c6cb;
}

/* Footer styles */
.footer {
  background: var(--primary-color);
  color: #fff;
  text-align: center;
  padding: 40px 20px;
  margin-top: 50px;
}

.social-links a {
  color: #fff;
  font-size: 1.5rem;
  margin: 0 15px;
  transition: all 0.3s ease;
  display: inline-block;
}

.social-links a:hover {
  color: var(--accent-color);
  transform: translateY(-3px);
}

/* Utility classes */
.text-gradient {
  background: linear-gradient(45deg, var(--primary-color), var(--accent-color));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hidden { opacity: 0; }
.visible { opacity: 1; }

/* Mobile responsive styles */
@media (max-width: 768px) {
  .hero {
    padding: 100px 15px 60px;
  }
  
  .hero h1 { 
    font-size: 3rem;
    margin-bottom: 35px;
  }
  
  .hero h3 { 
    font-size: 1.3rem;
    margin-bottom: 15px;
    padding: 0 10px;
    line-height: 1.4;
    white-space: normal; 
    max-width: 90%; 
    margin-left: auto;
    margin-right: auto;
    text-align: center;
  }
  
  .hero p { 
    font-size: 1rem;
    padding: 0 10px;
  }

  .typing-wrapper {
    min-height: 70px;
    padding: 0 15px;
    margin-bottom: 30px;
  }

  .typing-text {
    font-size: 1.1rem;
    white-space: normal;
    word-wrap: break-word;
    line-height: 1.5;
    max-width: 100%;
    padding-right: 5px;
  }

  .typing-text::after {
    height: 1em;
    width: 1.5px;
  }

  .btn-hero {
    display: block;
    width: 90%;          
    margin: 10px auto;   
    padding: 12px 20px;  
    font-size: 1rem;     
    border-radius: 40px; 
  }

  .navbar-brand { font-size: 1.3rem; }
  .brand-text { font-size: 1.3rem; }
  .brand-full { display: none; }
  .brand-short { display: inline; }
  
  .nav-link { 
    margin: 5px 0;
    padding: 10px 0;
  }
  
  .navbar-collapse {
    margin-top: 15px;
    background: rgba(13, 27, 42, 0.98);
    border-radius: 10px;
    padding: 20px;
    margin-left: -15px;
    margin-right: -15px;
  }
  
  .section-container { 
    margin: 20px 10px;
    padding: 25px 15px;
    border-radius: 15px;
  }
  
  .section-container h2 {
    font-size: 1.8rem;
    margin-bottom: 25px;
    text-align: center;
  }

  #skills .row { margin: 0; display: block !important; }
  #skills .col-12, #skills .col-md-4 {
    width: 100% !important;
    max-width: 100% !important;
    flex: none !important;
    display: block !important;
  }
  #skills .skill-card {
    margin: 0 0 30px 0 !important;
    padding: 25px 20px !important;
    border-radius: 12px;
    width: 100%;
    display: block;
  }
  #skills .mt-4 { margin-top: 0 !important; }
  #skills h5 {
    font-size: 1.1rem;
    margin-bottom: 20px;
    text-align: center;
  }
  .badge-skill {
    font-size: 0.85rem;
    padding: 10px 15px;
    margin: 4px;
    border-radius: 20px;
  }

  .project-preview { height: 180px; margin-bottom: 15px; }
  .project-fallback-icon { height: 180px; font-size: 3rem; }
  .card { margin-bottom: 25px; }
  .card-body { 
    padding: 15px; 
  }

  .card-title { 
    font-size: 1.2rem; 
    margin-bottom: 10px; 
  }

  .card-text { 
    font-size: 0.95rem; 
    line-height: 1.5; 
    margin-bottom: 10px; 
  }

  .card .btn-hero,
  .card .btn-custom,
  .card .btn-outline-primary {
    margin-top: 10px;   
    margin-bottom: 5px;
  }

  .education-card { 
    flex-direction: column; 
    text-align: center;
    gap: 15px;
    padding: 20px;
    margin-bottom: 20px;
  }
  .education-card img { width: 60px; }

  .experience-card { 
    padding: 20px; 
    margin-bottom: 20px; 
  }

  .experience-card .d-flex {
    flex-direction: column !important;
    align-items: flex-start !important;
  }

  .experience-card .date-badge {
    margin-top: 15px;
    margin-bottom: 15px;
    align-self: flex-start;
  }

  .date-badge {
    font-size: 0.7rem;
    padding: 4px 10px;
  }

  .profile-image-container img {
    width: 200px !important;
    height: 250px !important;
    margin: 15px 0;
  }

  .contact-form { padding: 20px; margin-bottom: 25px; }
  .form-control {
    font-size: 16px;
    padding: 15px;
  }
  .btn-custom { width: 100%; padding: 15px; margin-top: 15px; }

  .carousel-fixed { margin: 20px 10px; }
  .review-slide { padding: 25px 20px; }
  .review-mid { font-size: 1rem; line-height: 1.5; }

  .footer { padding: 30px 15px; margin-top: 40px; }
  .social-links a { font-size: 1.3rem; margin: 0 10px; }

  .lead { font-size: 1rem; line-height: 1.6; }
  .mb-3 { margin-bottom: 1rem !important; }
  .mb-4 { margin-bottom: 1.5rem !important; }
  .mt-4 { margin-top: 1.5rem !important; }
}

@media (max-width: 576px) {
  .hero h1 { margin-top: 20px; font-size: 3rem; }
  .hero h3 { font-size: 1.1rem; }
  .section-container { margin: 15px 5px; padding: 20px 12px; }
  .btn-hero { width: 90%; }
  #skills .skill-card { padding: 20px 15px !important; }
  .badge-skill { font-size: 0.8rem; padding: 8px 12px; margin: 3px; }

  .typing-text::after { height: 0.9em; width: 1px; }

  .review-slide {
    height: 380px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    overflow: hidden;
  }

  .review-mid {
    font-size: 0.95rem;
    line-height: 1.4;
    max-height: 9.5em;
    overflow: hidden;
  }

  .date-badge {
    font-size: 0.65rem;
    padding: 3px 8px;
  }
}
/* Larger screen styles */

@media (min-width: 769px) {
  .experience-card .d-flex {
    flex-direction: row !important;
    justify-content: space-between !important;
    align-items: flex-start !important;
    margin-bottom: 15px;
  }

  .experience-card ul {
    margin-top: 10px;
    margin-bottom: 0;
  }

  .date-badge {
    margin-left: 20px;
    margin-top: 0;
    margin-bottom: 0;
  }
}