.font-light {
  font-family: "Inter", serif;
  font-weight: 300;
  font-style: normal;
}

.font-regular {
  font-family: "Inter", serif;
  font-weight: 400;
  font-style: normal;
}

.font-heavy {
  font-family: "Inter", serif;
  font-weight: 600;
  font-style: normal;
}

:root {
  --accent: #cd6e00;
  --accent20: #cd6e0033;

  --bg: #1A120B;
  --bg90: #1A120BE6;

  --secondary: #2c1e13;
  --secondary40: #2c1e1366;

  --card-bg: #5F523D;
  --text-main: #f8fafc;
  --text-dim: #DBCBBD;
  --transition: all 0.3s ease;

  --black: #000;
  --white: #fff;
}

.selectDisable {
  -webkit-user-select: none;
  -khtml-user-select: none;
  -moz-user-select: none;
  -o-user-select: none;
  -ms-user-select: none;
  user-select: none;
}

html {
  scrollbar-width: none;
}

/* Firefox */
body {
  -ms-overflow-style: none;
}

/* IE and Edge */
body::-webkit-scrollbar,
body::-webkit-scrollbar-button {
  display: none;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  -webkit-tap-highlight-color: transparent;
  -moz-tap-highlight-color: rgba(0, 0, 0, 0);
}

.diagonal-divider {
  width: 0;
  height: 0;
  border-right: 100vw solid transparent;
  border-bottom: max(4vw, 3vh) solid var(--secondary);
  margin-top: -max(4vw, 3vh);
}

.selectDisable {
  -webkit-user-select: none;
  -khtml-user-select: none;
  -moz-user-select: none;
  -o-user-select: none;
  -ms-user-select: none;
  user-select: none;
}

body {
  font-family: 'Inter', sans-serif;
  background-color: var(--bg);
  color: var(--text-main);
  line-height: 1.6;
  scroll-behavior: smooth;
}

nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 2rem 10%;
  position: sticky;
  top: 0;
  background: var(--bg90);
  backdrop-filter: blur(10px);
  z-index: 100;
}

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--accent);
}

.nav-links {
  list-style: none;
  display: flex;
  gap: 2rem;
}

.nav-links a {
  text-decoration: none;
  color: var(--text-dim);
  transition: var(--transition);
}

.nav-links a:hover {
  color: var(--accent);
}


.section-title {
  font-size: 2.5rem;
  color: var(--text-main);
  margin-bottom: 3rem;
  position: relative;
  padding-left: 0.5rem;
}

.section-title::after {
  content: '';
  position: absolute;
  left: 0.5rem;
  bottom: -10px;
  width: 60px;
  height: 4px;
  background-color: var(--accent);
  border-radius: 2px;
}

.timeline-section {
  max-width: 1600px;
  padding: 4rem 5%;
  margin: 0 auto;
}

.timeline-container {
  position: relative;
  padding: 1rem 0;
}

.timeline-container::before {
  content: '';
  position: absolute;
  left: 10px;
  top: 0;
  bottom: 0;
  width: 4px;
  background-color: var(--secondary);
  border-radius: 2px;
}

.timeline-item {
  position: relative;
  padding-left: 3rem;
  margin-bottom: 4rem;
  scroll-margin-top: 12rem;
  cursor: pointer;
  transition: var(--transition);
  opacity: 0.6;
}

.timeline-item.active {
  opacity: 1;
}

.timeline-item:last-child {
  margin-bottom: 0;
}

.timeline-item.active .timeline-content {
  border-left: 4px solid var(--accent);
  box-shadow: 0 8px 20px var(--accent20);
}

.timeline-dot {
  position: absolute;
  left: 4px;
  top: 0;
  width: 16px;
  height: 16px;
  background-color: var(--accent);
  border-radius: 50%;
  box-shadow: 0 0 0 4px var(--bg);
}

.timeline-content {
  background-color: var(--card-bg);
  padding: 2rem;
  border-radius: 12px;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
  transition: var(--transition);
  border-left: 4px solid transparent;
}

.timeline-content:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 15px rgba(0, 0, 0, 0.4);
}

.timeline-content p {
  color: var(--text-dim);
}

.timeline-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 1rem;
  flex-direction: column;
}

.timeline-header h3 {
  color: var(--text-main);
  font-size: 1.5rem;
  margin-top: -0.3rem;
}

.timeline-date {
  color: var(--accent);
  font-weight: 600;
  font-size: 0.9rem;
  background-color: var(--accent20);
  padding: 0.25rem 0.75rem;
  border-radius: 20px;
}

.timeline-image {
  width: 100%;
  max-height: 400px;
  object-fit: cover;
  border-radius: 8px;
}

.btn {
  display: inline-block;
  background-color: var(--accent);
  color: var(--white);
  padding: 0.75rem 1.5rem;
  border-radius: 6px;
  text-decoration: none;
  font-weight: 600;
  align-self: flex-start;
  transition: var(--transition);
  border: 2px solid transparent;
}

.btn:hover {
  background-color: transparent;
  border-color: var(--accent);
  color: var(--accent);
}

.projects-grid {
  display: grid;
  grid-template-columns: 300px 1fr;
  gap: 4rem;
  align-items: start;
}

.timeline-trigger h3 {
  font-size: 1.1rem;
  margin-bottom: 0.5rem;
}

.details-display {
  background-color: var(--card-bg);
  border-radius: 12px;
  padding: 2rem;
  min-height: 400px;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
  position: sticky;
  top: 120px;
}

.detail-content {
  display: none;
  flex-direction: column;
  gap: 1.5rem;
  animation: fadeIn 0.4s ease;
}

.detail-content.active {
  display: flex;
}

.projects-layout {
  display: grid;
  align-items: start;
  grid-template-columns: 30em 1fr;
  gap: 4rem;
}

.details-panel {
  background-color: var(--secondary40);
  padding: 2rem;
  border-radius: 12px;
  border: 1px solid var(--secondary);
  width: 100%;
  display: block;
  position: sticky;
  top: 8rem;
  margin-top: 1rem;
  min-height: 450px;
}

.detail-text {
  display: none;
  border-left: 3px solid transparent;
  transition: none;
  overflow: hidden;
}

.detail-text.active {
  display: block;
  animation: slideUp 0.4s ease forwards;
}

.detail-text h3 {
  color: var(--accent);
  margin-bottom: 1.5rem;
  font-size: 1.8rem;
}

.detail-text p {
  font-size: 1.1rem;
  color: var(--text-dim);
}

footer {
  background-color: var(--secondary);
  padding: 3rem 10%;
  text-align: center;
  color: var(--text-dim);
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateX(10px);
  }

  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slideDown {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 900px) {

  .projects-layout {
    grid-template-columns: 1fr;
  }

  .details-panel {
    position: static;
    margin-top: 2rem;
    display: none;
  }

  .projects-grid {
    grid-template-columns: 1fr;
  }

  .details-display {
    position: static;
  }

  .timeline-item {
    scroll-margin-top: 10rem;
  }

  .timeline-item .detail-text.active {
    display: block;
    margin-top: 1.5rem;
    padding: 1.5rem;
    background-color: var(--secondary40);
    border-left: 3px solid var(--accent);
    border-radius: 0 8px 8px 0;
    animation: slideDown 0.4s ease forwards;
  }

  .timeline-item .detail-text h3 {
    font-size: 1.4rem;
    margin-bottom: 0.5rem;
  }
}

@media (max-width: 768px) {
  nav {
    flex-direction: column;
    gap: 1rem;
  }
}