/* CSS Variables for theming */
:root {
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --secondary: #7e22ce;
  --dark: #1e293b;
  --darker: #0f172a;
  --light: #f1f5f9;
  --lighter: #f8fafc;
  --gray: #64748b;
  --transition: all 0.3s ease;
  --shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
  --radius: 8px;
}

.dark-mode {
  --primary: #3b82f6;
  --primary-dark: #2563eb;
  --secondary: #a855f7;
  --dark: #f1f5f9;
  --darker: #f8fafc;
  --light: #1e293b;
  --lighter: #0f172a;
  --gray: #94a3b8;
  --shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.4);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  line-height: 1.6;
  color: var(--dark);
  background-color: var(--lighter);
  transition: var(--transition);
}

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

section {
  padding: 1rem 0;
  min-height: 20vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

h1,
h2,
h3,
h4 {
  margin-bottom: 1rem;
  line-height: 1.2;
  color: var(--darker);
}

h1 {
  font-size: 3.5rem;
}

h2 {
  font-size: 2.5rem;
  position: relative;
  padding-bottom: 0.5rem;
}

h2::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  height: 4px;
  width: 70px;
  background: var(--primary);
  border-radius: 2px;
}

p {
  margin-bottom: 1rem;
}

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

a:hover {
  color: var(--primary-dark);
}

img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius);
}

.btn {
  display: inline-block;
  padding: 0.8rem 1.8rem;
  background: var(--primary);
  color: white;
  border-radius: var(--radius);
  border: none;
  cursor: pointer;
  transition: var(--transition);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  font-size: 0.9rem;
  box-shadow: var(--shadow);
}

.btn:hover {
  background: var(--primary-dark);
  color: white;
  transform: translateY(-3px);
  box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
}

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

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

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

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

/* Header & Navigation */
header {
  position: fixed;
  top: 0;
  width: 100%;
  z-index: 1000;
  background-color: rgba(248, 250, 252, 0.95);
  box-shadow: var(--shadow);
  transition: var(--transition);
}

.dark-mode header {
  background-color: rgba(15, 23, 42, 0.95);
}

nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.2rem 0;
}

.logo {
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--darker);
}

.dark-mode .logo {
  color: var(--lighter);
}

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

.nav-links {
  display: flex;
  list-style: none;
}

.nav-links li {
  margin-left: 2rem;
}

.nav-links a {
  color: var(--darker);
  font-weight: 600;
  position: relative;
  font-size: 20px;
}

.dark-mode .nav-links a {
  color: #2563eb;
}

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

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

.theme-toggle {
  background: none;
  border: none;
  color: var(--darker);
  cursor: pointer;
  font-size: 1.5rem;
  margin-left: 2rem;
  transition: var(--transition);
}

.dark-mode .theme-toggle {
  color: white;
}

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

.dark-mode .menu-btn {
  color: white;
}

/* Hero Section */
#home {
  padding-top: 8rem;
  display: flex;
  align-items: center;
}

.hero-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
}

.hero-text h1 {
  font-size: 3.5rem;
  margin-bottom: 1.5rem;
}

.hero-text p {
  font-size: 1.2rem;
  margin-bottom: 2rem;
  color: var(--gray);
}

.hero-image {
  position: relative;
}

.hero-image img {
  box-shadow: var(--shadow);
}

.hero-btns {
  display: flex;
  gap: 1rem;
}

.video-container {
  margin-top: 4rem;
  grid-column: 1 / -1;
  text-align: center;
}

.video-container h3 {
  margin-bottom: 1.5rem;
}

.video-wrapper {
  position: relative;
  padding-bottom: 56.25%;
  height: 0;
  overflow: hidden;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

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

/* About Section */
.about-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 4rem;
}

/* Work Experience */
.work-exp {
  margin-bottom: 4rem;
}

.work-item {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 2rem;
  padding: 2rem;
  background: white;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  margin-bottom: 2rem;
  transition: var(--transition);
}

.dark-mode .work-item {
  background: var(--light);
}

.work-item:hover {
  transform: translateY(-5px);
  box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
}

.work-date {
  font-weight: 600;
  color: var(--primary);
}

.work-company {
  font-weight: 700;
  color: var(--darker);
  margin-bottom: 0.5rem;
}

.dark-mode .work-company {
  color: white;
}

.work-role {
  font-weight: 600;
  margin-bottom: 1rem;
}

/* Projects */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 2rem;
}

.project-card {
  background: white;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: var(--transition);
}

.dark-mode .project-card {
  background: var(--light);
}

.project-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
}

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

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

.project-card:hover .project-image img {
  transform: scale(1.05);
}

.project-content {
  padding: 1.5rem;
}

.project-content h3 {
  margin-bottom: 0.5rem;
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 1rem 0;
}

.project-tag {
  background: var(--primary);
  color: white;
  padding: 0.3rem 0.8rem;
  border-radius: 20px;
  font-size: 0.8rem;
}

/* Achievements */
.achievements-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 2rem;
}

.achievement-card {
  background: white;
  padding: 2rem;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  text-align: center;
  transition: var(--transition);
}

.dark-mode .achievement-card {
  background: var(--light);
}

.achievement-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
}

.achievement-icon {
  font-size: 3rem;
  color: var(--primary);
  margin-bottom: 1rem;
}

.achievement-date {
  color: var(--gray);
  font-size: 0.9rem;
}

/* Recommendations Carousel */
.recommendations {
  position: relative;
  max-width: 800px;
  margin: 0 auto;
  overflow: hidden;
}

.carousel {
  display: flex;
  transition: transform 0.5s ease;
}

.testimonial {
  min-width: 100%;
  padding: 2rem;
  background: white;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  text-align: center;
}

.dark-mode .testimonial {
  background: var(--light);
}

.testimonial-text {
  font-style: italic;
  margin-bottom: 1.5rem;
  position: relative;
  padding: 0 2rem;
}

.testimonial-text::before,
.testimonial-text::after {
  content: '"';
  font-size: 3rem;
  color: var(--primary);
  position: absolute;
  line-height: 1;
}

.testimonial-text::before {
  top: -0.5rem;
  left: 0;
}

.testimonial-text::after {
  bottom: -2rem;
  right: 0;
}

.testimonial-author {
  font-weight: 700;
  color: var(--darker);
}

.dark-mode .testimonial-author {
  color: white;
}

.testimonial-role {
  color: var(--gray);
  font-size: 0.9rem;
}

.carousel-controls {
  display: flex;
  justify-content: center;
  margin-top: 2rem;
  gap: 1rem;
}

.carousel-btn {
  background: var(--primary);
  color: white;
  border: none;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
}

.carousel-btn:hover {
  background: var(--primary-dark);
}

/* Knowledge Base Section */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 2rem;
}

.skill-category {
  background: white;
  padding: 2rem;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  transition: var(--transition);
}

.dark-mode .skill-category {
  background: var(--light);
}

.skill-category:hover {
  transform: translateY(-5px);
  box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
}

.skill-category h3 {
  color: var(--primary);
  margin-bottom: 1.5rem;
  text-align: center;
}

.skill-list {
  list-style: none;
}

.skill-list li {
  margin-bottom: 0.8rem;
  padding-left: 1.5rem;
  position: relative;
}

.skill-list li::before {
  content: "▹";
  position: absolute;
  left: 0;
  color: var(--primary);
}

/* Blogs Section */
.blog-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 2rem;
}

.blog-card {
  background: white;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: var(--transition);
}

.dark-mode .blog-card {
  background: var(--light);
}

.blog-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
}

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

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

.blog-card:hover .blog-image img {
  transform: scale(1.05);
}

.blog-content {
  padding: 1.5rem;
}

.blog-content h3 {
  margin-bottom: 0.5rem;
}

.blog-meta {
  display: flex;
  justify-content: space-between;
  color: var(--gray);
  font-size: 0.9rem;
  margin-bottom: 1rem;
}

.read-more {
  display: inline-block;
  margin-top: 1rem;
  font-weight: 600;
  color: var(--primary);
}

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

.contact-info {
  background: var(--primary);
  padding: 3rem;
  border-radius: var(--radius);
  color: white;
}

.contact-info h3 {
  color: white;
  margin-bottom: 2rem;
}

.contact-details {
  list-style: none;
}

.contact-details li {
  margin-bottom: 1.5rem;
  display: flex;
  align-items: center;
}

.contact-details i {
  margin-right: 1rem;
  font-size: 1.2rem;
}

.contact-form {
  background: white;
  padding: 3rem;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.dark-mode .contact-form {
  background: var(--light);
}

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

.form-group label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 600;
}

.form-control {
  width: 100%;
  padding: 0.8rem;
  border: 1px solid #ddd;
  border-radius: var(--radius);
  font-family: inherit;
  transition: var(--transition);
}

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

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

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

.dark-mode footer {
  background: var(--lighter);
  color: var(--darker);
}

.social-links {
  display: flex;
  justify-content: center;
  list-style: none;
  margin: 2rem 0;
}

.social-links li {
  margin: 0 1rem;
}

.social-links a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.1);
  color: white;
  transition: var(--transition);
}

.dark-mode .social-links a {
  background: rgba(0, 0, 0, 0.1);
  color: var(--darker);
}

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

.copyright {
  margin-top: 2rem;
  color: var(--gray);
}

.dark-mode .copyright {
  color: var(--gray);
}

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

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

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

  .work-item {
    grid-template-columns: 1fr;
  }

  .contact-container {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .menu-btn {
    display: block;
  }

  .nav-links {
    position: fixed;
    top: 70px;
    left: -100%;
    width: 100%;
    height: calc(100vh - 70px);
    background: var(--lighter);
    flex-direction: column;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
  }

  .dark-mode .nav-links {
    background: var(--darker);
  }

  .nav-links.active {
    left: 0;
  }

  .nav-links li {
    margin: 1.5rem 0;
  }

  .carousel {
    display: block;         /* stack items */
    overflow-x: hidden;     /* stop sideways scrolling */
    white-space: normal;    /* allow wrapping */
  }

  .testimonial {
    width: 100% !important;
    min-width: unset !important;
    margin: 1rem 0;
  }

  #prev-btn,
  #next-btn {
    display: none; /* hide nav buttons on mobile */
  }

  .skills-grid,
  .blog-grid,
  .projects-grid,
  .achievements-grid,
  .recommendations-grid,
  .work-exp,
  .education-grid {
    /* grid-template-columns: 1fr; */
    display: grid;
    grid-template-columns: 1fr;
    gap: 1rem; /* spacing between items */
  }

  .project-card,
  .achievement-card,
  .blog-card,
  .recommendation-card,
  .work-item {
    width: 100%;
    min-width: unset;
  }
}