:root {
  /* Light theme variables */
  --primary: #1840b9;
  --primary-dark: #0d2a8c;
  --secondary: #2c3e50;
  --accent: #4e8cff;
  --light: #f8f9fa;
  --dark: #212529;
  --success: #28a745;
  --gradient: linear-gradient(135deg, var(--primary), var(--accent));
  --shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
  --transition: all 0.3s ease;

  /* Dark theme variables */
  --dark-bg: #121212;
  --dark-card: #1e1e1e;
  --dark-text: #e0e0e0;
  --dark-primary: #5d9bff;
  --dark-accent: #4e8cff;
  --dark-secondary: #a0b3c6;
  --dark-header: rgba(30, 30, 30, 0.95);
  --dark-shadow: 0 5px 15px rgba(0, 0, 0, 0.4);
  --dark-border: rgba(255, 255, 255, 0.1);

  /* Common variables */
  --bg-color: var(--light);
  --text-color: var(--dark);
  --card-bg: white;
  --header-bg: rgba(255, 255, 255, 0.95);
  --current-shadow: var(--shadow);
  --current-primary: var(--primary);
  --current-accent: var(--accent);
  --current-secondary: var(--secondary);
}

/* Dark mode styles */
body.dark-mode {
  --bg-color: var(--dark-bg);
  --text-color: var(--dark-text);
  --card-bg: var(--dark-card);
  --header-bg: var(--dark-header);
  --current-shadow: var(--dark-shadow);
  --current-primary: var(--dark-primary);
  --current-accent: var(--dark-accent);
  --current-secondary: var(--dark-secondary);
}

*::-webkit-scrollbar {
  display: none;
}

body {
  font-family: "Poppins", sans-serif;
  line-height: 1.6;
  background-color: var(--bg-color);
  color: var(--text-color);
  transition: background-color 0.5s ease, color 0.5s ease;
  overflow-x: hidden;
}

h1,
h2,
h3,
h4 {
  font-family: "Montserrat", sans-serif;
  font-weight: 700;
  line-height: 1.2;
}

h1 {
  font-size: 3.5rem;
  margin-bottom: 1rem;
}

h2 {
  font-size: 2.5rem;
  margin-bottom: 2rem;
  position: relative;
}

h2 span {
  color: var(--current-primary);
}

h2::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -10px;
  width: 70px;
  height: 4px;
  background: linear-gradient(
    135deg,
    var(--current-primary),
    var(--current-accent)
  );
  border-radius: 2px;
}

p {
  margin-bottom: 1.5rem;
  font-size: 1.05rem;
}

.container {
  width: 90%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 15px;
}

section {
  padding: 80px 0;
}

.btn {
  display: inline-block;
  padding: 10px 30px;
  border-radius: 50px;
  font-weight: 500;
  text-decoration: none;
  transition: var(--transition);
  cursor: pointer;
  border: none;
  font-size: 1rem;
  text-align: center;
}

.btn-primary {
  background: linear-gradient(
    135deg,
    var(--current-primary),
    var(--current-accent)
  );
  color: white;
  box-shadow: var(--current-shadow);
}

.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 20px rgba(24, 64, 185, 0.3);
}

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

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

/* Header Styles */
header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background-color: var(--header-bg);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
  transition: var(--transition);
  backdrop-filter: blur(10px);
}

.header-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 0;
}

.logo {
  font-family: "Montserrat", sans-serif;
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--current-primary);
}

nav ul {
  display: flex;
  list-style: none;
}

nav ul li {
  margin-left: 30px;
}

nav ul li a {
  text-decoration: none;
  color: var(--current-secondary);
  font-weight: 500;
  font-size: 1.05rem;
  position: relative;
  padding: 5px 0;
  transition: var(--transition);
}

nav ul li a::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: linear-gradient(
    135deg,
    var(--current-primary),
    var(--current-accent)
  );
  transition: var(--transition);
}

/* Mobile dropdown menu styles */
.mobile-nav-dropdown {
  display: none;
  position: absolute;
  top: 60px;
  right: 20px;
  background: var(--card-bg);
  box-shadow: var(--current-shadow);
  border-radius: 15px;
  padding: 20px 0;
  z-index: 2000;
  min-width: 180px;
}
.mobile-nav-dropdown ul {
  display: flex;
  flex-direction: column;
  gap: 10px;
  list-style: none;
  margin: 0;
  padding: 0 20px;
}
.mobile-nav-dropdown li {
  margin: 0;
}
.mobile-nav-dropdown a {
  color: var(--current-secondary);
  text-decoration: none;
  font-weight: 500;
  font-size: 1.1rem;
  padding: 10px 0;
  border-radius: 8px;
  transition: var(--transition);
}
.mobile-nav-dropdown a:hover {
  background: var(--current-primary);
  color: #fff;
}

@media (max-width: 768px) {
  .mobile-nav-dropdown {
    display: block;
  }
}

nav ul li a:hover::after,
nav ul li a.active::after {
  width: 100%;
}

nav ul li a:hover,
nav ul li a.active {
  color: var(--current-primary);
}

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

/* Dark mode toggle */
.theme-toggle {
  background: transparent;
  border: none;
  color: var(--current-secondary);
  cursor: pointer;
  font-size: 1.5rem;
  margin-left: 20px;
  transition: var(--transition);
}

.theme-toggle:hover {
  color: var(--current-primary);
  transform: rotate(20deg);
}

/* Hide Let's Talk button on small screens */
.lets-talk {
  display: inline-block;
}

@media (max-width: 768px) {
  .lets-talk {
    display: none !important;
  }
}

/* Hero Section */
.hero {
  padding-top: 150px;
  padding-bottom: 80px;
  background: linear-gradient(
    135deg,
    rgba(24, 64, 185, 0.05) 0%,
    rgba(142, 171, 255, 0.05) 100%
  );
  position: relative;
  overflow: hidden;
}

body.dark-mode .hero {
  background: linear-gradient(
    135deg,
    rgba(24, 64, 185, 0.1) 0%,
    rgba(142, 171, 255, 0.05) 100%
  );
}

.hero::before {
  content: "";
  position: absolute;
  top: -300px;
  right: -300px;
  width: 700px;
  height: 700px;
  border-radius: 50%;
  background: linear-gradient(
    135deg,
    rgba(24, 64, 185, 0.1) 0%,
    rgba(142, 171, 255, 0.1) 100%
  );
  z-index: -1;
}

.hero-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 50px;
}

.hero-content {
  flex: 1;
}

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

.hero h1 span {
  color: var(--current-primary);
  position: relative;
}

.hero h1 span::after {
  content: "";
  position: absolute;
  bottom: 5px;
  left: 0;
  width: 100%;
  height: 12px;
  background: rgba(24, 64, 185, 0.2);
  z-index: -1;
}

body.dark-mode .hero h1 span::after {
  background: rgba(93, 155, 255, 0.2);
}

.hero h2 {
  font-size: 1.8rem;
  color: var(--current-secondary);
  margin-bottom: 1.5rem;
}

.hero-buttons {
  display: flex;
  gap: 20px;
  margin: 2rem 0;
}

.social-links {
  display: flex;
  gap: 20px;
  margin-top: 30px;
}

.social-link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background: var(--card-bg);
  color: var(--current-primary);
  font-size: 1.3rem;
  box-shadow: var(--current-shadow);
  transition: var(--transition);
}

.social-link:hover {
  background: linear-gradient(
    135deg,
    var(--current-primary),
    var(--current-accent)
  );
  color: white;
  transform: translateY(-5px);
}

.profile-image-placeholder {
  width: 100%;
  max-width: 400px;
  height: 500px;
  background: linear-gradient(
    135deg,
    var(--current-primary),
    var(--current-accent)
  );
  border-radius: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 1.2rem;
  box-shadow: var(--current-shadow);
  transition: var(--transition);
}

/* Image styling */
.profile-image {
  width: 100%;
  max-width: 400px;
  border-radius: 999px;
  box-shadow: var(--current-shadow);
  transition: var(--transition);
}

.about-image img {
  width: 100%;
  height: auto;
  border-radius: 20px;
  transition: var(--transition);
}

.project-image img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  transition: var(--transition);
}

/* Hover effects */
.profile-image:hover,
.about-image img:hover,
.project-image img:hover {
  transform: scale(1.02);
}

.hero-image:hover .profile-image-placeholder {
  transform: scale(1.02);
}

/* About Section */
.about-section {
  background-color: var(--card-bg);
}

.about-container {
  display: flex;
  gap: 50px;
  align-items: flex-start;
}

.about-image {
  flex: 1;
  border-radius: 20px;
  overflow: hidden;
  box-shadow: var(--current-shadow);
}

.about-image div {
  width: 100%;
  height: 500px;
  background: linear-gradient(
    135deg,
    var(--current-primary),
    var(--current-accent)
  );
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 1.2rem;
  transition: var(--transition);
}

.about-image:hover div {
  transform: scale(1.05);
}

.about-content {
  flex: 1.5;
}

.skills {
  margin: 30px 0;
}

.skill-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 15px;
}

.skill-tag {
  background: rgba(24, 64, 185, 0.1);
  color: var(--current-primary);
  padding: 8px 20px;
  border-radius: 50px;
  font-size: 0.9rem;
  font-weight: 500;
  transition: var(--transition);
}

body.dark-mode .skill-tag {
  background: rgba(93, 155, 255, 0.1);
}

.skill-tag:hover {
  background: var(--current-primary);
  color: white;
  transform: translateY(-3px);
}

.experience-item {
  background: rgba(248, 249, 250, 0.8);
  padding: 20px;
  border-radius: 15px;
  margin-bottom: 20px;
  border-left: 4px solid var(--current-primary);
  transition: var(--transition);
}

body.dark-mode .experience-item {
  background: rgba(30, 30, 30, 0.8);
}

.experience-item:hover {
  transform: translateY(-5px);
  box-shadow: var(--current-shadow);
}

.experience-item h4 {
  font-size: 1.2rem;
  color: var(--current-primary);
  margin-bottom: 5px;
}

.company {
  font-weight: 600;
  color: var(--current-secondary);
  margin-bottom: 5px;
}

.period {
  color: #6c757d;
  font-size: 0.9rem;
  margin-bottom: 10px;
}

body.dark-mode .period {
  color: #a0a0a0;
}

/* Projects Section */
.projects-section {
  background: linear-gradient(
    135deg,
    rgba(24, 64, 185, 0.03) 0%,
    rgba(142, 171, 255, 0.03) 100%
  );
}

body.dark-mode .projects-section {
  background: linear-gradient(
    135deg,
    rgba(24, 64, 185, 0.05) 0%,
    rgba(142, 171, 255, 0.05) 100%
  );
}

.section-header {
  text-align: center;
  margin-bottom: 50px;
}

.section-header h2::after {
  left: 50%;
  transform: translateX(-50%);
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 30px;
}

.project-card {
  background: var(--card-bg);
  border-radius: 20px;
  overflow: hidden;
  box-shadow: var(--current-shadow);
  transition: var(--transition);
}

.project-card:hover {
  transform: translateY(-10px);
  box-shadow: 0 15px 30px rgba(0, 0, 0, 0.15);
}

.project-image {
  height: 200px;
  overflow: hidden;
}

.project-image div {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  transition: var(--transition);
  background: linear-gradient(
    135deg,
    var(--current-primary),
    var(--current-accent)
  );
}

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

.project-info {
  padding: 25px;
}

.project-info h3 {
  font-size: 1.4rem;
  margin-bottom: 15px;
  color: var(--current-secondary);
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 15px 0;
}

.project-tag {
  background: rgba(24, 64, 185, 0.1);
  color: var(--current-primary);
  padding: 5px 15px;
  border-radius: 50px;
  font-size: 0.8rem;
  font-weight: 500;
}

body.dark-mode .project-tag {
  background: rgba(93, 155, 255, 0.1);
}

.project-links {
  display: flex;
  gap: 15px;
  margin-top: 20px;
}

.project-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--current-primary);
  text-decoration: none;
  font-weight: 500;
  transition: var(--transition);
}

.project-link:hover {
  color: var(--current-accent);
  transform: translateX(3px);
}

/* Contact Section */
.contact-section {
  background-color: var(--card-bg);
}

.contact-container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 40px;
}

.contact-card {
  background: rgba(248, 249, 250, 0.8);
  padding: 30px;
  border-radius: 20px;
  box-shadow: var(--current-shadow);
  transition: var(--transition);
}

body.dark-mode .contact-card {
  background: rgba(30, 30, 30, 0.8);
}

.contact-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 15px 30px rgba(0, 0, 0, 0.1);
}

.contact-card-title {
  color: var(--current-primary);
  margin-bottom: 25px;
  font-size: 1.5rem;
}

.contact-info-item {
  display: flex;
  gap: 15px;
  margin-bottom: 20px;
  align-items: flex-start;
}

.contact-icon {
  background: linear-gradient(
    135deg,
    var(--current-primary),
    var(--current-accent)
  );
  color: white;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.contact-text {
  flex: 1;
}

.contact-text strong {
  display: block;
  margin-bottom: 5px;
}

/* Footer */
footer {
  background: var(--current-secondary);
  color: white;
  padding: 30px 0;
  text-align: center;
}

.footer-content {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.footer-logo {
  font-family: "Montserrat", sans-serif;
  font-size: 1.8rem;
  font-weight: 800;
  margin-bottom: 15px;
  color: white;
}

.footer-links {
  display: flex;
  gap: 20px;
  margin-bottom: 20px;
}

.footer-links a {
  color: rgba(255, 255, 255, 0.8);
  text-decoration: none;
  transition: var(--transition);
}

.footer-links a:hover {
  color: white;
}

.copyright {
  font-size: 0.9rem;
  color: rgba(255, 255, 255, 0.7);
}

/* Scroll Progress Bar */
#scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 4px;
  width: 0;
  background: linear-gradient(
    135deg,
    var(--current-primary),
    var(--current-accent)
  );
  z-index: 9999;
  transition: width 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  border-radius: 0 2px 2px 0;
}

/* Back to Top Button */
#back-to-top {
  position: fixed;
  right: 24px;
  bottom: 32px;
  width: 48px;
  height: 48px;
  background: linear-gradient(
    135deg,
    var(--current-primary),
    var(--current-accent)
  );
  color: #fff;
  border: none;
  border-radius: 50%;
  box-shadow: 0 4px 16px rgba(24, 64, 185, 0.2);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  cursor: pointer;
  opacity: 0;
  transform: scale(0.7);
  pointer-events: none;
  transition: opacity 0.3s cubic-bezier(0.4, 0, 0.2, 1),
    transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  z-index: 100;
}

#back-to-top.visible {
  opacity: 1;
  transform: scale(1);
  pointer-events: auto;
}

#back-to-top:hover {
  transform: scale(1.08);
}

#back-to-top:active {
  transform: scale(0.95);
}

/* Responsive Design */
@media (max-width: 992px) {
  h1 {
    font-size: 2.8rem;
  }

  h2 {
    font-size: 2rem;
  }

  .hero-container,
  .about-container {
    flex-direction: column;
  }

  .hero-image {
    order: -1;
    margin-bottom: 40px;
  }

  .hero-buttons {
    flex-direction: column;
  }
}

@media (max-width: 768px) {
  nav ul {
    display: none;
  }

  .mobile-menu-btn {
    display: block;
  }

  .hero {
    padding-top: 120px;
  }

  section {
    padding: 60px 0;
  }

  .right-section {
    display: flex;
    align-items: center;
  }
}

@media (max-width: 576px) {
  h1 {
    font-size: 2.2rem;
  }

  h2 {
    font-size: 1.8rem;
  }

  .hero h2 {
    font-size: 1.4rem;
  }

  .project-links {
    flex-direction: column;
  }
}