/* Base styles and variables */
:root {
  --color-background: #0a0a1a;
  --color-text: #f8f8f8;
  --color-primary: #64ffda;
  --color-primary-light: #a7ffeb;
  --color-secondary: #00bcd4;
  --color-accent: #7c4dff;
  --color-dark: #121212;
  --color-card: #1a1a2e;
  --color-card-hover: #252542;
  --color-tennis: rgba(76, 175, 80, 0.15);
  --color-soccer: rgba(33, 150, 243, 0.15);
  --color-astrophotography: rgba(156, 39, 176, 0.15);
  --font-heading: 'Poppins', sans-serif;
  --font-body: 'Inter', sans-serif;
  --border-radius: 8px;
  --transition: all 0.3s ease;
  --shadow: 0 4px 12px rgba(0, 0, 0, 0.25);
  --shadow-hover: 0 6px 16px rgba(0, 0, 0, 0.35);
}

/* Reset and global styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  background-color: var(--color-background);
  background-image: radial-gradient(circle at 50% 50%, #1a1a3a 0%, #0a0a1a 100%);
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  overflow-x: hidden;
  position: relative;
}

/* Stars background */
#stars-container {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
  background-image: 
    radial-gradient(2px 2px at 20px 30px, #ffffff, rgba(0, 0, 0, 0)),
    radial-gradient(2px 2px at 40px 70px, #ffffff, rgba(0, 0, 0, 0)),
    radial-gradient(1px 1px at 90px 40px, #ffffff, rgba(0, 0, 0, 0)),
    radial-gradient(1px 1px at 130px 80px, #ffffff, rgba(0, 0, 0, 0)),
    radial-gradient(2px 2px at 160px 120px, #ffffff, rgba(0, 0, 0, 0)),
    radial-gradient(3px 3px at 200px 200px, var(--color-primary-light), rgba(0, 0, 0, 0)),
    radial-gradient(2px 2px at 300px 300px, var(--color-secondary), rgba(0, 0, 0, 0));
  background-repeat: repeat;
  background-size: 400px 400px;
  opacity: 0.6;
  animation: slide 120s linear infinite;
}

/* Space objects container */
#space-objects-container {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -2;
  overflow: hidden;
}

/* Nebula effect */
.nebula {
  position: absolute;
  width: 600px;
  height: 400px;
  top: 60%;
  left: 30%;
  background-image: radial-gradient(ellipse at center, rgba(124, 77, 255, 0.2) 0%, rgba(124, 77, 255, 0) 70%);
  filter: blur(40px);
  animation: nebula-pulse 15s ease-in-out infinite;
  z-index: -10;
}

/* Galaxy effect */
.galaxy {
  position: absolute;
  width: 300px;
  height: 300px;
  top: 20%;
  right: 15%;
  background-image: 
    repeating-conic-gradient(rgba(100, 255, 218, 0.1) 0%, rgba(0, 188, 212, 0.1) 5%, rgba(0, 0, 0, 0) 5.5%),
    radial-gradient(circle at center, rgba(100, 255, 218, 0.3) 0%, rgba(100, 255, 218, 0) 70%);
  border-radius: 50%;
  animation: galaxy-rotate 120s linear infinite;
  opacity: 0.7;
  z-index: -9;
}

/* Shooting star */
.shooting-star {
  position: absolute;
  width: 100px;
  height: 1px;
  background: linear-gradient(to right, rgba(255, 255, 255, 0), rgba(255, 255, 255, 0.8), rgba(255, 255, 255, 0));
  transform: rotate(45deg);
  animation: shooting-star 5s linear infinite;
  z-index: -8;
}

#space-objects-container::before {
  content: '';
  position: absolute;
  width: 300px;
  height: 300px;
  top: 10%;
  left: 15%;
  background-image: radial-gradient(circle at center, rgba(100, 255, 218, 0.2) 0%, rgba(100, 255, 218, 0) 70%);
  animation: pulsate 8s ease-in-out infinite alternate;
}

#space-objects-container::after {
  content: '';
  position: absolute;
  width: 400px;
  height: 400px;
  bottom: 5%;
  right: 10%;
  background-image: radial-gradient(circle at center, rgba(124, 77, 255, 0.15) 0%, rgba(124, 77, 255, 0) 70%);
  animation: pulsate 12s ease-in-out 2s infinite alternate;
}

@keyframes pulsate {
  0% { transform: scale(1); opacity: 0.2; }
  50% { transform: scale(1.2); opacity: 0.3; }
  100% { transform: scale(1); opacity: 0.2; }
}

@keyframes slide {
  from { background-position: 0 0; }
  to { background-position: 400px 400px; }
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 600;
  margin: 1.5rem 0 1rem;
  line-height: 1.2;
}

h1 {
  font-size: 2.5rem;
  margin-top: 0;
}

h2 {
  font-size: 2rem;
}

h3 {
  font-size: 1.5rem;
}

p {
  margin-bottom: 1rem;
}

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

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

/* Layout containers */
.page-container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem 1rem 4rem;
}

.back-button-container {
  margin-bottom: 2rem;
}

.back-button {
  display: inline-flex;
  align-items: center;
  padding: 0.5rem 1rem;
  background-color: transparent;
  border: 1px solid var(--color-primary);
  color: var(--color-primary);
  border-radius: var(--border-radius);
  transition: var(--transition);
}

.back-button:hover {
  background-color: rgba(144, 202, 249, 0.1);
  transform: translateX(-5px);
}

.page-title {
  font-size: 2.5rem;
  margin-bottom: 0.5rem;
  color: var(--color-primary);
  text-align: center;
}

.page-subtitle {
  text-align: center;
  font-size: 1.2rem;
  color: var(--color-text);
  margin-bottom: 2.5rem;
  opacity: 0.8;
}

/* Navigation */
.navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 2rem;
  position: relative;
  background-color: rgba(26, 26, 46, 0.95);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  z-index: 1000;
  border-bottom: 1px solid rgba(100, 255, 218, 0.2);
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.crown-icon {
  font-size: 1.5rem;
}

.crown-icon.large {
  font-size: 3rem;
}

.name {
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 1.25rem;
  color: var(--color-primary);
}

.nav-menu {
  display: flex;
  list-style: none;
  gap: 1rem;
}

.nav-link {
  color: var(--color-text);
  padding: 0.5rem 1rem;
  border-radius: var(--border-radius);
  transition: var(--transition);
}

.nav-link:hover,
.nav-link.active {
  color: var(--color-primary);
  background-color: rgba(100, 255, 218, 0.1);
  text-shadow: 0 0 8px rgba(100, 255, 218, 0.4);
}

.nav-toggle {
  display: none;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
}

.hamburger {
  display: block;
  position: relative;
  width: 24px;
  height: 2px;
  background: var(--color-text);
}

.hamburger::before,
.hamburger::after {
  content: '';
  position: absolute;
  width: 24px;
  height: 2px;
  background: var(--color-text);
  transition: var(--transition);
}

.hamburger::before {
  transform: translateY(-8px);
}

.hamburger::after {
  transform: translateY(8px);
}

/* Home page */
.home-container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem 1rem 4rem;
}

.hero {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 4rem 1rem;
}

.profile-wrapper {
  margin-bottom: 2rem;
}

.profile-image {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto;
  box-shadow: var(--shadow);
}

.profile-placeholder {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto;
  box-shadow: var(--shadow);
}

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

.hero-subtitle {
  font-size: 1.2rem;
  max-width: 600px;
  margin: 0 auto 2rem;
  opacity: 0.9;
}

.quote-container {
  max-width: 700px;
  margin: 2rem auto;
}

.animated-quote {
  font-style: italic;
  font-size: 1.3rem;
  color: var(--color-primary);
  padding: 1.5rem;
  border-left: 3px solid var(--color-secondary);
  background-color: rgba(144, 202, 249, 0.05);
  border-radius: 0 var(--border-radius) var(--border-radius) 0;
  position: relative;
}

.animated-quote p {
  margin: 0;
  opacity: 0;
  animation: fadeIn 1.5s ease-in-out forwards;
}

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

.quick-links {
  padding: 2rem 1rem 4rem;
}

.quick-links h2 {
  text-align: center;
  margin-bottom: 2rem;
  color: var(--color-primary);
}

.cards-container {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.5rem;
  max-width: 1200px;
  margin: 0 auto;
}

.card {
  background-color: var(--color-card);
  border-radius: var(--border-radius);
  overflow: hidden;
  transition: var(--transition);
  box-shadow: var(--shadow);
  height: 100%;
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-hover);
  background-color: var(--color-card-hover);
}

.card-content {
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  height: 100%;
  position: relative;
}

.card-icon {
  position: absolute;
  top: 1rem;
  right: 1rem;
  font-size: 1.5rem;
  opacity: 0.7;
}

.card h3 {
  margin-top: 0;
  margin-bottom: 0.75rem;
  font-size: 1.4rem;
  color: var(--color-primary);
}

.card p {
  margin-bottom: 1.5rem;
  flex-grow: 1;
}

/* About page */
.about-section {
  margin-bottom: 3rem;
}

.bio-container {
  display: grid;
  grid-template-columns: 1fr 3fr;
  gap: 2rem;
  align-items: start;
}

.bio-content {
  background-color: rgba(37, 37, 37, 0.7);
  padding: 1.5rem;
  border-radius: var(--border-radius);
}

.education-container {
  background-color: rgba(37, 37, 37, 0.7);
  padding: 1.5rem;
  border-radius: var(--border-radius);
}

.education-item h3 {
  color: var(--color-primary);
  margin-bottom: 0.5rem;
}

.education-degree {
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.education-date {
  font-size: 0.9rem;
  color: var(--color-text);
  opacity: 0.8;
  margin-bottom: 1rem;
}

.hobby-cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.5rem;
}

.hobby-card {
  padding: 1.5rem;
  border-radius: var(--border-radius);
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.hobby-card.tennis {
  background-color: var(--color-tennis);
  border: 1px solid rgba(76, 175, 80, 0.3);
}

.hobby-card.soccer {
  background-color: var(--color-soccer);
  border: 1px solid rgba(33, 150, 243, 0.3);
}

.hobby-card.astrophotography {
  background-color: var(--color-astrophotography);
  border: 1px solid rgba(156, 39, 176, 0.3);
}

.hobby-icon {
  font-size: 2rem;
  margin-bottom: 1rem;
}

.hobby-card h3 {
  margin-top: 0;
}

.hobby-content {
  color: var(--color-text);
}

/* Astrophotography Journey */
.astro-journey {
  max-width: 900px;
  margin: 0 auto;
}

.accordion {
  width: 100%;
}

.accordion-item {
  margin-bottom: 1rem;
  border-radius: var(--border-radius);
  overflow: hidden;
  background-color: rgba(37, 37, 37, 0.7);
}

.accordion-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
  padding: 1.25rem;
  background-color: rgba(144, 202, 249, 0.1);
  border: none;
  text-align: left;
  cursor: pointer;
  transition: var(--transition);
  color: var(--color-text);
}

.accordion-header:hover {
  background-color: rgba(144, 202, 249, 0.15);
}

.accordion-header h3 {
  margin: 0;
  font-size: 1.25rem;
  color: var(--color-primary);
}

.accordion-icon {
  font-size: 1.5rem;
  transition: var(--transition);
}

.accordion-content {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease-out;
}

.content-wrapper {
  padding: 0 1.25rem 1.25rem;
}

.accordion-item.active .accordion-header {
  background-color: rgba(144, 202, 249, 0.2);
}

.accordion-item.active .accordion-icon {
  transform: rotate(45deg);
}

.accordion-item.active .accordion-content {
  max-height: 10000px;
}

.image-container {
  margin: 1.5rem 0;
}

.journey-image {
  width: 100%;
  max-width: 100%;
  border-radius: var(--border-radius);
}

.image-caption {
  text-align: center;
  font-size: 0.9rem;
  color: var(--color-text);
  opacity: 0.8;
  margin-top: 0.5rem;
}

.video-container {
  position: relative;
  overflow: hidden;
  padding-top: 56.25%; /* 16:9 aspect ratio */
  margin: 1.5rem 0;
}

.video-container iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border-radius: var(--border-radius);
  border: none;
}

.gallery-link {
  text-align: center;
  margin-top: 2rem;
}

.gallery-link a {
  font-weight: 600;
}

/* Gallery page */
.gallery-container {
  max-width: 1200px;
  margin: 0 auto;
}

.gallery-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 1rem;
}

.gallery-item {
  position: relative;
  aspect-ratio: 1;
  overflow: hidden;
  border-radius: var(--border-radius);
  cursor: pointer;
  background-color: var(--color-dark);
}

.gallery-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.3s ease-in-out;
}

.gallery-item:hover img {
  transform: scale(1.05);
}

.gallery-item::after {
  content: attr(data-title);
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 0.75rem;
  background-color: rgba(0, 0, 0, 0.7);
  color: white;
  font-size: 0.9rem;
  transform: translateY(100%);
  transition: transform 0.3s ease-in-out;
}

.gallery-item:hover::after {
  transform: translateY(0);
}

/* Lightbox */
.lightbox {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.9);
  z-index: 1100;
  padding: 30px;
  box-sizing: border-box;
}

.lightbox.active {
  display: block;
}

.close-lightbox {
  position: absolute;
  top: 20px;
  right: 30px;
  font-size: 2rem;
  color: white;
  cursor: pointer;
  z-index: 1110;
}

.lightbox-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100%;
}

.lightbox-content img {
  max-width: 90%;
  max-height: 80vh;
  object-fit: contain;
}

#lightbox-caption {
  color: white;
  text-align: center;
  margin-top: 1rem;
  font-size: 1.1rem;
}

.lightbox-nav {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  background: rgba(255, 255, 255, 0.1);
  border: none;
  color: white;
  font-size: 1.5rem;
  padding: 1rem 0.5rem;
  cursor: pointer;
  z-index: 1110;
  border-radius: var(--border-radius);
}

.lightbox-nav.prev {
  left: 20px;
}

.lightbox-nav.next {
  right: 20px;
}

/* Research page */
.search-container {
  margin-bottom: 2.5rem;
  text-align: center;
}

.search-input {
  width: 100%;
  max-width: 600px;
  padding: 0.75rem 1.25rem;
  background-color: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(144, 202, 249, 0.3);
  border-radius: var(--border-radius);
  color: var(--color-text);
  margin-bottom: 1.5rem;
}

.search-input:focus {
  outline: none;
  border-color: var(--color-primary);
}

.filter-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
}

.filter-buttons {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.5rem;
}

.filter-btn {
  padding: 0.5rem 1rem;
  background-color: rgba(37, 37, 37, 0.7);
  border: 1px solid rgba(144, 202, 249, 0.3);
  border-radius: var(--border-radius);
  color: var(--color-text);
  cursor: pointer;
  transition: var(--transition);
}

.filter-btn:hover,
.filter-btn.active {
  background-color: var(--color-primary);
  color: var(--color-dark);
}

.research-section {
  margin-bottom: 3rem;
}

.category-title {
  color: var(--color-primary);
  margin-bottom: 1.5rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid rgba(144, 202, 249, 0.3);
}

.papers {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

.paper-card {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 1.5rem;
  background-color: rgba(37, 37, 37, 0.7);
  border-radius: var(--border-radius);
  padding: 1.5rem;
  transition: var(--transition);
}

.paper-card:hover {
  background-color: rgba(37, 37, 37, 0.9);
  transform: translateY(-3px);
  box-shadow: var(--shadow);
}

.paper-icon {
  font-size: 2rem;
  align-self: start;
}

.paper-content h3 {
  margin-top: 0;
  color: var(--color-primary);
}

.paper-date {
  font-size: 0.9rem;
  color: var(--color-text);
  opacity: 0.8;
  margin-bottom: 1rem;
}

.paper-actions {
  margin-top: 1.5rem;
}

/* Resume page */
.resume-actions {
  display: flex;
  justify-content: center;
  gap: 1rem;
  margin-bottom: 2rem;
}

.button {
  display: inline-flex;
  align-items: center;
  padding: 0.75rem 1.5rem;
  background-color: rgba(100, 255, 218, 0.1);
  border: 1px solid var(--color-primary);
  color: var(--color-text);
  border-radius: var(--border-radius);
  transition: var(--transition);
  font-weight: 500;
  box-shadow: 0 0 10px rgba(100, 255, 218, 0.1);
}

.button.primary {
  background-color: var(--color-primary);
  color: #0a0a1a;
  text-shadow: none;
}

.button:hover {
  transform: translateY(-3px);
  box-shadow: 0 0 15px rgba(100, 255, 218, 0.3);
}

.button-icon {
  margin-right: 0.5rem;
}

.pdf-container {
  width: 100%;
  background-color: rgba(26, 26, 46, 0.7);
  border-radius: var(--border-radius);
  overflow: hidden;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
  border: 1px solid rgba(100, 255, 218, 0.2);
}

.pdf-container embed {
  border: none;
}

/* PDF Modal */
.pdf-modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.9);
  z-index: 1200;
}

.pdf-modal.active {
  display: block;
}

.pdf-modal-content {
  position: relative;
  width: 90%;
  max-width: 900px;
  margin: 2% auto;
  background-color: #1a1a2e;
  padding: 25px;
  border-radius: var(--border-radius);
  max-height: 95vh;
  overflow-y: auto;
  box-shadow: 0 0 25px rgba(100, 255, 218, 0.2);
  border: 1px solid rgba(100, 255, 218, 0.2);
}

.close-pdf-modal {
  position: absolute;
  top: 15px;
  right: 20px;
  font-size: 1.8rem;
  color: var(--color-text);
  cursor: pointer;
  z-index: 1210;
  transition: var(--transition);
}

.close-pdf-modal:hover {
  color: var(--color-primary);
  transform: scale(1.1);
}

.close-pdf-modal:focus {
  outline: none;
}

.pdf-modal-content h3 {
  margin-bottom: 1.5rem;
  color: var(--color-primary);
}

.pdf-modal .pdf-container {
  width: 100%;
  background-color: rgba(26, 26, 46, 0.7);
  border-radius: var(--border-radius);
  overflow: hidden;
}

/* Rocket animation */
@keyframes rocket-fly {
  0% { transform: translate(-100px, 100px) rotate(45deg); }
  100% { transform: translate(calc(100vw + 100px), calc(-100vh - 100px)) rotate(45deg); }
}

/* Footer */
footer {
  text-align: center;
  padding: 2rem 1rem;
  background-color: rgba(12, 12, 12, 0.7);
  color: var(--color-text);
  position: relative;
}

/* Media Queries */
@media (max-width: 768px) {
  .navbar {
    flex-wrap: wrap;
  }

  .nav-toggle {
    display: block;
  }

  .nav-menu {
    width: 100%;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease-out;
    flex-direction: column;
    text-align: center;
  }

  .nav-menu.active {
    max-height: 300px;
  }

  .bio-container {
    grid-template-columns: 1fr;
    gap: 1rem;
  }

  .bio-image {
    margin-bottom: 1rem;
  }

  .paper-card {
    grid-template-columns: 1fr;
    gap: 1rem;
  }

  .paper-icon {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
  }
}

@media (max-width: 480px) {
  html {
    font-size: 14px;
  }

  .hero-title {
    font-size: 2.5rem;
  }

  .hero-subtitle {
    font-size: 1rem;
  }
  
  .cards-container,
  .hobby-cards,
  .gallery-grid {
    grid-template-columns: 1fr;
  }
  
  .resume-actions {
    flex-direction: column;
    align-items: center;
  }
}