:root {
  --primary-color: #3b82f6;
  --primary-dark: #2563eb;
  --secondary-color: #1e293b;
  --accent-color: #f59e0b;
  --text-primary: #1f2937;
  --text-secondary: #6b7280;
  --bg-primary: #ffffff;
  --bg-secondary: #f8fafc;
  --border-color: #e5e7eb;
  --shadow: 0 10px 25px -3px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 20px 50px -12px rgba(0, 0, 0, 0.25);
}

[data-theme="dark"] {
  --text-primary: #f9fafb;
  --text-secondary: #d1d5db;
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --border-color: #374151;
  --shadow: 0 10px 25px -3px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 20px 50px -12px rgba(0, 0, 0, 0.5);
}

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

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

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Navigation */
.navbar {
  position: fixed;
  top: 0;
  width: 100%;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  z-index: 1000;
  padding: 1rem 0;
  transition: all 0.3s ease;
  border-bottom: 1px solid var(--border-color);
}

[data-theme="dark"] .navbar {
  background: rgba(15, 23, 42, 0.95);
}

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

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary-color);
  text-decoration: none;
}

.nav-links {
  display: flex;
  list-style: none;
  gap: 2rem;
  align-items: center;
}

.nav-links a {
  text-decoration: none;
  color: var(--text-primary);
  font-weight: 500;
  transition: color 0.3s ease;
  position: relative;
}

.nav-links a:hover {
  color: var(--primary-color);
}

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

.nav-links a:hover::after {
  width: 100%;
}

.theme-toggle {
  background: none;
  border: 2px solid var(--border-color);
  color: var(--text-primary);
  padding: 0.5rem;
  border-radius: 50%;
  cursor: pointer;
  transition: all 0.3s ease;
  font-size: 1rem;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
}

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

.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 1.5rem;
  cursor: pointer;
}

/* Hero Section */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  background: linear-gradient(
    135deg,
    var(--bg-primary) 0%,
    var(--bg-secondary) 100%
  );
  position: relative;
  overflow: hidden;
}

.hero::before {
  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 1000 1000"><defs><radialGradient id="a" cx="50%" cy="50%"><stop offset="0%" stop-color="%233b82f6" stop-opacity="0.1"/><stop offset="100%" stop-color="%233b82f6" stop-opacity="0"/></radialGradient></defs><circle cx="200" cy="200" r="300" fill="url(%23a)"/><circle cx="800" cy="800" r="200" fill="url(%23a)"/></svg>')
    no-repeat center center;
  background-size: cover;
  opacity: 0.5;
}

.hero-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
  position: relative;
  z-index: 1;
}

.hero-text h1 {
  font-size: 3.5rem;
  font-weight: 700;
  margin-bottom: 1rem;
  background: linear-gradient(
    135deg,
    var(--primary-color),
    var(--accent-color)
  );
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: fadeInUp 1s ease;
}

.hero-text h2 {
  font-size: 1.5rem;
  color: var(--text-secondary);
  margin-bottom: 2rem;
  animation: fadeInUp 1s ease 0.2s both;
}

.hero-text p {
  font-size: 1.1rem;
  color: var(--text-secondary);
  margin-bottom: 2rem;
  animation: fadeInUp 1s ease 0.4s both;
}

.hero-buttons {
  display: flex;
  gap: 1rem;
  animation: fadeInUp 1s ease 0.6s both;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  border-radius: 0.5rem;
  text-decoration: none;
  font-weight: 600;
  transition: all 0.3s ease;
  border: none;
  cursor: pointer;
  font-size: 1rem;
}

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

.btn-primary:hover {
  background: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

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

.btn-secondary:hover {
  border-color: var(--primary-color);
  color: var(--primary-color);
  transform: translateY(-2px);
}

.hero-image {
  display: flex;
  justify-content: center;
  animation: fadeInRight 1s ease 0.8s both;
}

.profile-card {
  background: var(--bg-primary);
  border-radius: 1rem;
  padding: 2rem;
  box-shadow: var(--shadow-lg);
  text-align: center;
  border: 1px solid var(--border-color);
}

.profile-avatar {
  width: 150px;
  height: 150px;
  border-radius: 50%;
  background: linear-gradient(
    135deg,
    var(--primary-color),
    var(--accent-color)
  );
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 1rem;
  font-size: 3rem;
  color: white;
  font-weight: 700;
}

/* Sections */
.section {
  padding: 5rem 0;
  position: relative;
}

.section:nth-child(even) {
  background: var(--bg-secondary);
}

.section-title {
  text-align: center;
  margin-bottom: 3rem;
}

.section-title h2 {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 1rem;
  position: relative;
  display: inline-block;
}

.section-title h2::after {
  content: "";
  position: absolute;
  bottom: -10px;
  left: 50%;
  transform: translateX(-50%);
  width: 50px;
  height: 3px;
  background: var(--primary-color);
}

.section-title p {
  color: var(--text-secondary);
  font-size: 1.1rem;
  max-width: 600px;
  margin: 0 auto;
}

/* Skills Section */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
  margin-top: 3rem;
}

.skill-category {
  background: var(--bg-primary);
  padding: 2rem;
  border-radius: 1rem;
  box-shadow: var(--shadow);
  border: 1px solid var(--border-color);
  transition: transform 0.3s ease;
}

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

.skill-category h3 {
  font-size: 1.5rem;
  margin-bottom: 1.5rem;
  color: var(--primary-color);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.skill-items {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

.skill-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--bg-secondary);
  padding: 0.5rem 1rem;
  border-radius: 0.5rem;
  font-weight: 500;
  transition: all 0.3s ease;
}

.skill-item:hover {
  background: var(--primary-color);
  color: white;
  transform: scale(1.05);
}

/* Experience Section */
.experience-card {
  background: var(--bg-primary);
  padding: 2rem;
  border-radius: 1rem;
  box-shadow: var(--shadow);
  border: 1px solid var(--border-color);
  position: relative;
  margin-bottom: 2rem;
}

.experience-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 1rem;
}

.experience-title {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--primary-color);
}

.experience-company {
  font-size: 1.1rem;
  font-weight: 500;
  margin-bottom: 0.5rem;
}

.experience-duration {
  color: var(--text-secondary);
  font-weight: 500;
  background: var(--bg-secondary);
  padding: 0.25rem 0.75rem;
  border-radius: 0.25rem;
}

.experience-achievements {
  list-style: none;
  margin-top: 1rem;
}

.experience-achievements li {
  padding: 0.5rem 0;
  position: relative;
  padding-left: 1.5rem;
}

.experience-achievements li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--primary-color);
  font-weight: bold;
}

/* Projects Section */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: 2rem;
  margin-top: 3rem;
}

.project-card {
  background: var(--bg-primary);
  border-radius: 1rem;
  overflow: hidden;
  box-shadow: var(--shadow);
  border: 1px solid var(--border-color);
  transition: all 0.3s ease;
}

.project-card:hover {
  transform: translateY(-10px);
  box-shadow: var(--shadow-lg);
}

.project-image {
    height: 200px;
    width: 100%;
    overflow: hidden;
    border-radius: 8px; /* optional: smooth edges */
    position: relative;
}

.project-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;   /* makes image fully cover container */
    object-position: center; /* keeps focus centered */
    display: block;
}


.project-content {
  padding: 1.5rem;
}

.project-title {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: var(--primary-color);
}

.project-description {
  color: var(--text-secondary);
  margin-bottom: 1rem;
  line-height: 1.6;
}

.project-tech {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.project-card {
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    cursor: pointer; /* shows pointer on hover */
}

.project-card:hover {
    transform: translateY(-8px) scale(1.02);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.2);
}

.project-card:active {
    transform: scale(0.98); /* slight press effect */
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}


.tech-tag {
  background: var(--bg-secondary);
  color: var(--text-primary);
  padding: 0.25rem 0.5rem;
  border-radius: 0.25rem;
  font-size: 0.875rem;
  font-weight: 500;
}

.project-links {
  display: flex;
  gap: 1rem;
}

.project-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--primary-color);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.3s ease;
}

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

/* Education & Achievements */
.education-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
  margin-top: 3rem;
}

.education-card,
.achievement-card {
  background: var(--bg-primary);
  padding: 2rem;
  border-radius: 1rem;
  box-shadow: var(--shadow);
  border: 1px solid var(--border-color);
  text-align: center;
  transition: transform 0.3s ease;
}

.education-card:hover,
.achievement-card:hover {
  transform: translateY(-5px);
}

.education-icon,
.achievement-icon {
  width: 60px;
  height: 60px;
  background: var(--primary-color);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 1rem;
  color: white;
  font-size: 1.5rem;
}

/* Contact Section */
.contact-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  margin-top: 3rem;
}

.contact-info h3 {
  font-size: 1.5rem;
  margin-bottom: 1rem;
  color: var(--primary-color);
}

.contact-item {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1rem;
  color: var(--text-secondary);
}

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

.contact-form {
  background: var(--bg-primary);
  padding: 2rem;
  border-radius: 1rem;
  box-shadow: var(--shadow);
  border: 1px solid var(--border-color);
}

.form-group {
  margin-bottom: 1.5rem;
}

.form-group label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 500;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 0.75rem;
  border: 2px solid var(--border-color);
  border-radius: 0.5rem;
  background: var(--bg-secondary);
  color: var(--text-primary);
  font-family: inherit;
  transition: border-color 0.3s ease;
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--primary-color);
}

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

/* Footer */
.footer {
  background: var(--secondary-color);
  color: white;
  padding: 3rem 0 1rem;
  text-align: center;
}

.social-links {
  display: flex;
  justify-content: center;
  gap: 2rem;
  margin-bottom: 2rem;
}

.social-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 50px;
  height: 50px;
  background: rgba(255, 255, 255, 0.1);
  color: white;
  border-radius: 50%;
  text-decoration: none;
  font-size: 1.25rem;
  transition: all 0.3s ease;
}

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

/* Back to Top Button */
.back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  background: var(--primary-color);
  color: white;
  border: none;
  border-radius: 50%;
  width: 50px;
  height: 50px;
  font-size: 1.25rem;
  cursor: pointer;
  transition: all 0.3s ease;
  opacity: 0;
  visibility: hidden;
  z-index: 1000;
}

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

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

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

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

.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.6s ease;
}

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

/* Responsive Design */
@media (max-width: 768px) {
  .mobile-menu-btn {
    display: block;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--bg-primary);
    flex-direction: column;
    padding: 1rem;
    border-top: 1px solid var(--border-color);
    box-shadow: var(--shadow);
  }

  .nav-links.active {
    display: flex;
  }

  .hero-content {
    grid-template-columns: 1fr;
    text-align: center;
    gap: 2rem;
  }

  .hero-text h1 {
    font-size: 2.5rem;
  }

  .hero-buttons {
    justify-content: center;
    flex-wrap: wrap;
  }

  .contact-content {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .section-title h2 {
    font-size: 2rem;
  }

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

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

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

@media (max-width: 480px) {
  .container {
    padding: 0 15px;
  }

  .hero-text h1 {
    font-size: 2rem;
  }

  .section {
    padding: 3rem 0;
  }

  .btn {
    padding: 0.5rem 1rem;
    font-size: 0.9rem;
  }
}