/* ============================================= */
/* ================ BASE STYLES ================ */
/* ============================================= */

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: 'Roboto', sans-serif;
  background-color: #000e1b;
  color: #e0e1dd;
  line-height: 1.6;
  overflow-x: hidden; /* Prevent horizontal scroll due to animations */
}

h1 a {
  text-decoration: none;
  color: inherit;
}

h1 a:visited,
h1 a:hover,
h1 a:active {
  color: inherit;
  text-decoration: none;
}

/* ============================================= */
/* =============== LAYOUT STYLES =============== */
/* ============================================= */

header {
  background-color: #01192B;
  padding: 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  position: relative;
  z-index: 10;
  box-shadow: 0px 4px 10px rgba(0, 0, 0, 0.2);
  animation: headerSlideIn 1s ease-out;
}

section {
  padding: 40px;
  max-width: 1200px;
  margin: 0 auto;
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
}

.lessons-layout {
  display: flex;
  margin: 20px auto;
  max-width: 1400px;
}

/* ============================================= */
/* ============== COMPONENT STYLES ============= */
/* ============================================= */

/* ---------- Header ---------- */
header h1 {
  color: #e0ae3e;
  font-size: 32px;
  letter-spacing: 1px;
  transition: transform 0.3s ease;
}

/* ---------- Navigation ---------- */
nav ul {
  list-style: none;
  display: flex;
  gap: 20px;
}

nav ul li a {
  color: #e0e1dd;
  text-decoration: none;
  font-weight: 600;
  font-size: 18px;
  position: relative;
  padding: 5px 10px;
  transition: color 0.3s ease, transform 0.3s ease;
}

nav ul li a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: #e0ae3e;
  transform: scaleX(0);
  transition: transform 0.3s ease;
}

nav ul li a:hover {
  color: #e0ae3e;
  transform: scale(1.1);
}

nav ul li a:hover::after {
  transform: scaleX(1);
}

/* ---------- Home Section ---------- */
#home {
  text-align: center;
  background-color: #01253F;
  padding: 60px 20px;
  position: relative;
  animation: backgroundMove 5s infinite alternate;
}

.intro h2 {
  color: #e0ae3e;
  font-size: 50px;
  font-weight: 700;
  animation: fadeIn 1.5s ease-in-out;
}

.intro p {
  font-size: 20px;
  margin: 20px 0;
}

.portrait {
  width: 300px;
  height: 300px;
  border-radius: 50%;
  border: 3px solid #e0ae3e;
  margin-top: -10px;
  margin-bottom: 15px;
  object-fit: cover;
}

.links a {
  background-color: #01192B;
  color: #e0e1dd;
  padding: 12px 24px;
  border-radius: 5px;
  text-decoration: none;
  margin: 5px;
  font-size: 18px;
  transition: background-color 0.3s ease, transform 0.3s ease, box-shadow 0.3s ease;
}

.links a:hover {
  background-color: #e0ae3e;
  transform: translateY(-5px);
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.3);
}

/* ---------- About Section ---------- */
#about {
  background-color: #01192B;
  color: #e0e1dd;
  border-left: 5px solid #e0ae3e;
  padding-left: 20px;
  margin-bottom: 40px;
  animation: aboutMove 1s ease-out forwards;
}

#about h2 {
  font-size: 30px;
  margin-bottom: 10px;
}

/* ---------- Experience Section ---------- */
#experience {
  background-color: #01192B;
  color: #e0e1dd;
  padding: 40px;
  max-width: 1200px;
  margin: 0 auto;
  animation: fadeInUp 1.5s ease-out;
}

#experience h2 {
  font-size: 32px;
  color: #e0ae3e;
  margin-bottom: 20px;
  text-align: center;
  animation: fadeIn 1.5s ease-out;
}

.experience-item {
  background-color: #01253F;
  padding: 20px;
  margin-bottom: 20px;
  border-radius: 8px;
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.experience-item:hover {
  transform: scale(1.05);
  box-shadow: 0 6px 12px rgba(0, 0, 0, 0.3);
}

.experience-item h3 {
  font-size: 28px;
  color: #e0ae3e;
  margin-bottom: 10px;
}

.experience-item p,
.experience-item ul {
  font-size: 18px;
  margin-bottom: 15px;
}

.experience-item a {
  color: #e0ae3e;
  font-size: 18px;
  text-decoration: none;
  font-weight: 600;
}

.experience-item a:hover {
  color: #e76f51;
  text-decoration: underline;
}

/* ---------- Projects Section ---------- */
#projects .project {
  background-color: #01253F;
  padding: 25px;
  margin-bottom: 20px;
  border-radius: 8px;
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

#projects .project:hover {
  transform: scale(1.05);
  box-shadow: 0 6px 12px rgba(0, 0, 0, 0.3);
}

#projects .project h3 {
  color: #e0ae3e;
  font-size: 28px;
  font-weight: 700;
  margin-bottom: 10px;
}

#projects .project p {
  font-size: 18px;
  margin-bottom: 15px;
}

#projects .project a {
  color: #e0ae3e;
  font-size: 18px;
  text-decoration: none;
  font-weight: 600;
}

#projects .project a:hover {
  color: #e76f51;
  text-decoration: underline;
}

.project-button {
  display: inline-block;
  background-color: #e0ae3e;
  color: #01192B;
  font-weight: bold;
  padding: 14px 28px;
  border-radius: 8px;
  font-size: 18px;
  text-decoration: none;
  transition: transform 0.3s ease, background-color 0.3s ease, box-shadow 0.3s ease;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
}

.project-button:hover {
  background-color: #e76f51;
  transform: translateY(-4px) scale(1.05);
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.3);
}

/* Project Descriptions */
.full-description {
  display: none;
  margin-top: 10px;
}

.project.expanded .full-description {
  display: block;
}

.short-description {
  display: -webkit-box;
  -webkit-line-clamp: 5;
  -webkit-box-orient: vertical;
  overflow: hidden;
  text-overflow: ellipsis;
  max-height: 7.5em;
  line-height: 1.5em;
  transition: max-height 0.3s ease;
}

.project.expanded .short-description {
  -webkit-line-clamp: unset;
  max-height: none;
  overflow: visible;
}

.toggle-button {
  background-color: #01192B;
  color: #e0ae3e;
  border: none;
  padding: 10px 20px;
  margin-top: 10px;
  cursor: pointer;
  border-radius: 6px;
  font-weight: bold;
  transition: background-color 0.3s ease;
}

.toggle-button:hover {
  background-color: #e76f51;
}

.pinned-subtitle {
  font-size: 0.85rem;
  color: #888;
  font-style: italic;
  margin-bottom: 4px;
  margin-top: -4px;
  letter-spacing: 0.3px;
}

/* ---------- Resume Section ---------- */
#resume {
  text-align: center;
  margin-top: 40px;
  background-color: #01253F;
  padding: 30px;
  border-radius: 15px;
  box-shadow: 0px 4px 10px rgba(0, 0, 0, 0.2);
  width: 80%;
  max-width: 900px;
  margin-left: auto;
  margin-right: auto;
  margin-bottom: 40px;
  animation: slideIn 1s ease-out;
}

#resume h2 {
  font-size: 24px;
  color: #e0ae3e;
  margin-bottom: 20px;
}

#resume p {
  color: #e0e1dd;
  font-size: 18px;
  margin-bottom: 20px;
}

#resume a button {
  background-color: #e0ae3e;
  color: #01192B;
  padding: 12px 25px;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  font-size: 18px;
  text-decoration: none;
  transition: background-color 0.3s ease, transform 0.3s ease;
}

#resume a button:hover {
  background-color: #e76f51;
  transform: scale(1.1);
}

/* ---------- Contact Section ---------- */
#contact {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  padding: 40px;
  background-color: #01192B;
  text-align: center;
  border-radius: 8px;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.3);
  position: relative;
  animation: contactMove 1s ease-out;
}

#contact h2 {
  font-size: 32px;
  color: #e0ae3e;
  margin-bottom: 30px;
  animation: fadeIn 1.5s ease-out;
}

#contact p {
  font-size: 18px;
  color: #e0e1dd;
  margin-bottom: 20px;
}

.email-link {
  color: #e0ae3e;
  text-decoration: none;
  font-size: 20px;
  font-weight: bold;
  transition: color 0.3s ease;
}

.email-link:hover {
  color: #e76f51;
}

/* ---------- LeetCode Counter ---------- */
#leetcode-counter {
  position: fixed;
  top: 10px;
  right: 10px;
  background-color: #e0ae3e;
  color: #01192B;
  padding: 10px 16px;
  font-weight: bold;
  font-size: 16px;
  border-radius: 8px;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.3);
  z-index: 1000;
}

/* ---------- Sidebar (Lessons Page) ---------- */
#sidebar {
  width: 250px;
  background-color: #01192B;
  padding: 20px;
  border-radius: 8px;
  margin-right: 20px;
  box-shadow: 0 4px 10px rgba(0,0,0,0.3);
  position: sticky;
  top: 100px;
  height: fit-content;
}

#sidebar h2 {
  color: #e0ae3e;
  font-size: 22px;
  margin-bottom: 15px;
  text-align: center;
  border-bottom: 2px solid #e0ae3e;
  padding-bottom: 8px;
}

#sidebar ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
}

#sidebar ul li {
  margin: 12px 0;
  order: 0;
}

#sidebar ul li a {
  color: #e0e1dd;
  text-decoration: none;
  font-size: 16px;
  font-weight: 500;
  display: block;
  padding: 6px 10px;
  border-radius: 6px;
  transition: color 0.3s ease, padding-left 0.3s ease;
}

#sidebar ul li a:hover {
  color: #916b17;
  background-color: #01253F;
  padding-left: 15px;
}

#sidebar ul li a.active-lesson {
  background-color: #916b17;
  color: #01192B;
  font-weight: bold;
}

/* ---------- Lessons Content ---------- */
#lessons-content {
  flex: 1;
  min-width: 0;
  background-color: #01253F;
  padding: 30px;
  border-radius: 8px;
  box-shadow: 0 4px 10px rgba(0,0,0,0.3);
}

#lessons-content section {
  margin-bottom: 40px;
  display: none;
}

#lessons-content section.active {
  display: block;
}

.lesson-content {
  display: none;
  animation: fadeIn 0.3s ease-in;
}

.lesson-content.active {
  display: block;
}

.lesson-content h1 {
  color: #e0ae3e;
  border-bottom: 2px solid #e0ae3e;
  padding-bottom: 10px;
  margin-bottom: 20px;
}

.lesson-content h2,
.lesson-content h3 {
  color: #e0ae3e;
  margin-top: 25px;
  margin-bottom: 10px;
}

.lesson-content code {
  background-color: #01192B;
  color: #e0ae3e;
  padding: 2px 6px;
  border-radius: 4px;
  font-family: 'Courier New', monospace;
}

.lesson-content pre {
  background-color: #01192B;
  color: #e0e1dd;
  padding: 15px;
  border-radius: 8px;
  overflow-x: auto;
  border-left: 4px solid #e0ae3e;
}

.lesson-content pre code {
  background: none;
  padding: 0;
}

.lesson-content blockquote {
  border-left: 4px solid #e0ae3e;
  padding: 15px 20px;
  margin-left: 0;
  font-style: italic;
  background-color: #01192B;
  border-radius: 0 8px 8px 0;
}

/* ---------- Search ---------- */
#search-container {
  margin-top: 20px;
  padding-top: 15px;
  position: relative;
  border-top: 1px solid #e0ae3e;
  animation: fadeInUp 0.5s ease-out;
}

#lesson-search {
  width: 100%;
  padding: 10px 35px 10px 12px;
  background-color: #01253F;
  border: 2px solid #e0ae3e;
  border-radius: 6px;
  color: #e0e1dd;
  font-size: 14px;
  transition: border-color 0.3s ease, box-shadow 0.3s ease;
  box-sizing: border-box;
}

#lesson-search:focus {
  outline: none;
  border-color: #e76f51;
  box-shadow: 0 0 8px rgba(224, 174, 62, 0.3);
}

#lesson-search::placeholder {
  color: #888;
  font-style: italic;
}

#lesson-search:hover {
  border-color: #e76f51;
}

#clear-search {
  position: absolute;
  right: 8px;
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  color: #e0ae3e;
  font-size: 20px;
  font-weight: bold;
  cursor: pointer;
  width: 25px;
  height: 25px;
  border-radius: 50%;
  display: none;
  align-items: center;
  justify-content: center;
  transition: background-color 0.3s ease, color 0.3s ease;
}

#clear-search:hover {
  background-color: #e0ae3e;
  color: #01192B;
}

#no-results {
  margin-top: 15px;
  padding: 10px;
  background-color: #01253F;
  border-radius: 6px;
  border-left: 4px solid #e76f51;
}

#no-results p {
  margin: 0;
  color: #e0e1dd;
  font-size: 14px;
  font-style: italic;
  text-align: center;
}

#loading {
  padding: 10px;
  text-align: center;
  color: #e0ae3e;
  font-style: italic;
  font-size: 14px;
}

/* ============================================= */
/* =============== ANIMATIONS ================== */
/* ============================================= */

@keyframes headerSlideIn {
  from {
    transform: translateY(-100%);
    opacity: 0;
  }
  to {
    transform: translateY(0);
    opacity: 1;
  }
}

@keyframes backgroundMove {
  from { background-position: 0 0; }
  to { background-position: 100% 100%; }
}

@keyframes aboutMove {
  from {
    transform: translateX(-50px);
    opacity: 0;
  }
  to {
    transform: translateX(0);
    opacity: 1;
  }
}

@keyframes contactMove {
  from {
    transform: translateY(50px);
    opacity: 0;
  }
  to {
    transform: translateY(0);
    opacity: 1;
  }
}

@keyframes slideIn {
  from {
    transform: translateY(50px);
    opacity: 0;
  }
  to {
    transform: translateY(0);
    opacity: 1;
  }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

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

/* ============================================= */
/* =============== MEDIA QUERIES =============== */
/* ============================================= */

@media (max-width: 768px) {
  nav ul {
    flex-direction: column;
    gap: 15px;
    background-color: #01253F;
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0px 4px 8px rgba(0, 0, 0, 0.2);
  }

  nav ul li a {
    font-size: 16px;
  }

  .intro h2 {
    font-size: 36px;
  }

  .portrait {
    width: 200px;
    height: 200px;
  }

  #experience h2 {
    font-size: 28px;
  }

  .experience-item h3 {
    font-size: 24px;
  }

  .experience-item p,
  .experience-item ul {
    font-size: 16px;
  }

  #projects .project h3 {
    font-size: 24px;
  }

  #projects .project p {
    font-size: 16px;
  }

  .project-button {
    font-size: 16px;
    padding: 12px 20px;
  }

  #resume h2 {
    font-size: 22px;
  }

  #resume p {
    font-size: 16px;
  }

  #resume a button {
    font-size: 16px;
    padding: 10px 20px;
  }

  #contact h2 {
    font-size: 28px;
  }

  #contact p {
    font-size: 16px;
  }

  #sidebar {
    width: 100%;
    margin-right: 0;
    margin-bottom: 20px;
    position: relative;
    top: 0;
  }

  .lessons-layout {
    flex-direction: column;
  }
}

@media (max-width: 480px) {
  header h1 {
    font-size: 24px;
  }

  nav ul li a {
    font-size: 14px;
  }

  .intro h2 {
    font-size: 28px;
  }

  .portrait {
    width: 150px;
    height: 150px;
  }

  .links a {
    font-size: 16px;
    padding: 10px 20px;
  }

  #experience h2 {
    font-size: 24px;
  }

  .experience-item h3 {
    font-size: 20px;
  }

  .experience-item p,
  .experience-item ul {
    font-size: 14px;
  }

  #projects .project h3 {
    font-size: 20px;
  }

  #projects .project p {
    font-size: 14px;
  }

  .project-button {
    font-size: 14px;
    padding: 10px 16px;
  }

  #resume h2 {
    font-size: 20px;
  }

  #resume p {
    font-size: 14px;
  }

  #resume a button {
    font-size: 14px;
    padding: 8px 16px;
  }

  #contact h2 {
    font-size: 24px;
  }

  #contact p {
    font-size: 14px;
  }

  #sidebar h2 {
    font-size: 18px;
  }

  #sidebar ul li a {
    font-size: 14px;
  }

  #lesson-search {
    font-size: 12px;
  }
}