@import url("https://fonts.googleapis.com/css2?family=Lato:ital,wght@0,100;0,300;0,400;0,700;0,900;1,100;1,300;1,400;1,700;1,900&family=Poppins:ital,wght@0,100;0,200;0,300;0,400;0,500;0,600;0,700;0,800;0,900;1,100;1,200;1,300;1,400;1,500;1,600;1,700;1,800;1,900&display=swap");

/* Dark Theme */
:root {
  --bg-color: #111827;
  --text-primary: #f9fafb;
  --text-secondary: #9ca3af;
  --accent-color: #3b82f6;
  --highlight-color: #facc15;
  --border-color: #1f2937;
}

/* Light Theme */
body.light {
  --bg-color: #f9fafb;
  --text-primary: #111827;
  --text-secondary: #4b5563;
  --accent-color: #2563eb;
  --highlight-color: #eab308;
  --border-color: #d1d5db;
}

body {
  font-family: "Lato", sans-serif;
  box-sizing: border-box;
  background-color: var(--bg-color);
  color: var(--text-primary);
  line-height: 1.5rem;
  transition: background-color 0.3s ease, color 0.3s ease;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: "Poppins", sans-serif;
  font-weight: 600;
}

p,
span,
li {
  color: var(--text-secondary);
  font-size: 1rem;
}

a {
  color: var(--accent-color);
  text-decoration: none;
  font-weight: 500;
}

a:hover {
  color: var(--highlight-color);
  text-decoration: underline;
}

li {
  line-height: 1.9rem;
}

.main-container {
  max-width: 800px;
  margin: 0 auto;
  padding: 1rem;
  scroll-behavior: smooth;
}

.page-section {
  padding-top: 1rem;
  padding-bottom: 1rem;
}

.hero-wrapper {
  display: flex;
  align-items: center;
  gap: 3rem;
}

#profile-pic {
  width: 150px;
  height: 150px;
  border-radius: 50%;
  object-fit: cover;
}

#user-name {
  font-size: 38px;
  line-height: 2.5rem;
}

.contact-list {
  display: flex;
  justify-content: space-between;
  column-gap: 1rem;
  flex-wrap: wrap;
}

.contact-list a {
  font-weight: 400;
  font-size: 0.9rem;
}

.contact-list a:hover {
  color: var(--highlight-color);
}

.contact-list i {
  color: var(--highlight-color);
  padding-right: 0.25rem;
}

.skills-wrapper {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  font-size: 0.9rem;
}

.skill-card {
  border: 2px solid var(--border-color);
  border-radius: 25px;
  padding: 0.5rem 1rem;
  align-items: center;
}

.skill-card:hover {
  border-color: var(--highlight-color);
}

.skill-card span:hover {
  color: var(--highlight-color);
  cursor: pointer;
}

.experience-card {
  border-left: 1px solid var(--border-color);
  margin-top: 3rem;
  margin-bottom: 3rem;
  padding-left: 2rem;
}

.experience-card i {
  margin-right: 0.5rem;
  color: var(--highlight-color);
}

.work-text li {
  font-size: 0.9rem;
}

.education-card {
  margin-top: 2rem;
  margin-bottom: 2rem;
}

.education-card i {
  padding-right: 0.5rem;
  color: var(--highlight-color);
}

.education-card li {
  font-size: 0.9rem;
}

#publications-list li {
  font-size: 0.8rem;
}

.project-card {
  margin-top: 2rem;
  margin-bottom: 2rem;
}

.project-card i {
  padding-right: 0.5rem;
  color: var(--highlight-color);
}

.project-card li {
  font-size: 0.9rem;
}

.line-break {
  background-color: var(--border-color);
  height: 3px;
}

.course-card {
  padding-top: 1rem;
  padding-bottom: 1rem;
  border-bottom: 2px solid var(--border-color);
}

.course-card a {
  color: var(--text-secondary);
}

.course-card a:hover {
  color: var(--highlight-color);
}

.course-card i {
  padding-right: 0.2rem;
  color: var(--highlight-color);
}

footer {
  text-align: center;
  font-size: 0.9rem;
}

/* Switch slider styling */
.switch {
  position: fixed;
  top: 1rem;
  right: 1rem;
  display: inline-block;
  width: 60px;
  height: 34px;
}

.switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: var(--highlight-color);
  transition: 0.4s;
  border-radius: 34px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 6px;
  font-size: 16px;
}

.slider:before {
  position: absolute;
  content: "";
  height: 26px;
  width: 26px;
  left: 4px;
  bottom: 4px;
  background-color: var(--text-primary);
  transition: 0.4s;
  border-radius: 50%;
  z-index: 1;
}

input:checked + .slider {
  background-color: var(--highlight-color);
}

input:checked + .slider:before {
  transform: translateX(26px);
  background-color: var(--bg-color);
}

.slider .icon {
  position: relative;
  z-index: 2;
  pointer-events: none;
}

/* Scroll Top Button */
#scrollTopBtn {
  display: none;
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 1000;
  width: 48px;
  height: 48px;
  border: none;
  border-radius: 50%;
  background: rgba(0, 0, 0, 0.6);
  color: white;
  font-size: 20px;
  cursor: pointer;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.25);
  backdrop-filter: blur(4px); /* gives a frosted effect */
  transition: opacity 0.3s ease, transform 0.3s ease, background 0.3s ease;
}

/* Hover effect */
#scrollTopBtn:hover {
  background: var(--highlight-color);
  color: var(--bg-color);
  transform: translateY(-3px);
}

/* Small fade-in/out animation */
#scrollTopBtn.show {
  display: block;
  opacity: 1;
}

@media (max-width: 600px) {
  .hero-wrapper {
    flex-direction: column;
    gap: 1rem;
    padding-top: 2rem;
  }
  #user-name {
    text-align: center;
    font-size: 32px;
  }
}