@import url("https://fonts.googleapis.com/css2?family=Inter:wght@400;600;700&display=swap");
:root {
  --font-sans: "Inter", sans-serif;
  --color-primary: #0077cc;
  --color-text: #333;
  --color-bg: #f9f9f9;
  --transition-speed: 0.3s;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
html {
  scroll-behavior: smooth;
}
body {
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
  text-rendering: optimizeLegibility;
}

.hero {
  height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  background: linear-gradient(135deg, #eaeff5, #ffffff);
  text-align: center;
  position: relative;
  overflow: hidden;
}
.hero h1 {
  font-size: 4rem;
}
.hero .highlight {
  color: var(--color-primary);
}
.hero .subtitle {
  font-size: 1.2rem;
  color: #555;
  margin-top: 0.5rem;
}
.scroll-down {
  position: absolute;
  bottom: 20px;
  font-size: 2rem;
  color: var(--color-text);
  cursor: pointer;
  animation: bounce 2s infinite;
}
@keyframes bounce {
  0%,
  20%,
  50%,
  80%,
  100% {
    transform: translateY(0);
  }
  40% {
    transform: translateY(-10px);
  }
  60% {
    transform: translateY(-5px);
  }
}

section {
  max-width: 1000px;
  margin: 0 auto;
  padding: 80px 20px;
  opacity: 0;
  transform: translateY(20px);
  transition: opacity var(--transition-speed) ease-out,
    transform var(--transition-speed) ease-out;
}
section.show {
  opacity: 1;
  transform: translateY(0);
}
section h2 {
  font-size: 2rem;
  text-align: center;
  margin-bottom: 1rem;
  color: var(--color-primary);
}
.about p {
  max-width: 800px;
  margin: 0 auto;
  color: #555;
}

/* Filter buttons above projects */
.project-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: center;
  margin-bottom: 20px;
}
.filter-btn {
  padding: 6px 12px;
  background: #e4e4e4;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  font-size: 0.9rem;
  color: #333;
  transition: background var(--transition-speed);
}
.filter-btn:hover {
  background: #d1d1d1;
}
.filter-btn.active {
  background: var(--color-primary);
  color: #fff;
}

/* Hide projects when filtered out */
.project.hide {
  display: none;
}

.project-grid {
  display: grid;
  grid-template-columns: repeat(3, 300px);
  gap: 20px;
  justify-content: center;
}
.project {
  position: relative;
  overflow: hidden;
  border-radius: 8px;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  transition: transform var(--transition-speed);
  display: flex;
  flex-direction: column;
  background: #fff;
  /* Disable text selection inside project cards */
  user-select: none;
}
.project img {
  width: 100%;
  height: auto;
  display: block;
  transition: transform var(--transition-speed);
  border-radius: 8px 8px 0 0;
}
.project .overlay {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  background: rgba(0, 119, 204, 0.8);
  color: #fff;
  padding: 10px;
  text-align: center;
  transform: translateY(100%);
  transition: transform var(--transition-speed);
}
.project:hover img {
  transform: scale(1.05);
}
.project:hover .overlay {
  transform: translateY(0);
}

/* Add darken overlay on hover and click feedback */
.project::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.1);
  opacity: 0;
  transition: opacity var(--transition-speed);
  border-radius: 8px;
  pointer-events: none;
}
.project:hover::after {
  opacity: 1;
}
.project:active {
  transform: scale(0.98);
  transition: transform 0.1s;
}

.project-details {
  display: flex;
  flex-direction: column;
  flex: 1;
  padding: 16px;
}

.project-details h3 {
  font-size: 1.25rem;
  margin-bottom: 8px;
  color: var(--color-text);
}

.project-desc {
  font-size: 0.95rem;
  margin-bottom: 12px;
  color: #555;
}

.project-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: auto;
}

.project-meta .type {
  font-weight: 600;
  color: var(--color-primary);
}

.project-meta .tag,
.project-meta .date {
  background: #e4e4e4;
  color: var(--color-text);
  padding: 2px 6px;
  border-radius: 4px;
}

/* Tags below project images */
.tags {
  font-size: 0.9rem;
  color: #777;
  margin-top: 8px;
  text-align: center;
}

/* Timeline styles */
.timeline-container {
  position: relative;
  margin: 0 auto;
  margin-top: 20px;
  padding: 10px 0 10px 60px;
  max-width: 800px;
}
.timeline-container::before {
  content: "";
  position: absolute;
  left: 30px;
  top: 0;
  width: 3px;
  bottom: 0;
  background: var(--color-primary);
  z-index: -1;
}
.timeline-event {
  position: relative;
  margin-bottom: 30px;
  padding-left: 30px; /* create space for badge and line */
}
.timeline-event:last-child {
  margin-bottom: 0;
}
.timeline-event::before {
  content: "";
  position: absolute;
  left: 26px;
  top: 0;
  width: 12px;
  height: 12px;
  background: var(--color-primary);
  border-radius: 50%;
  z-index: -1;
}
.timeline-date {
  position: absolute;
  left: 30px;
  top: 0;
  transform: translateX(-50%);
  display: inline-block;
  background: var(--color-primary);
  color: #fff;
  padding: 3px 8px;
  border-radius: 4px;
  font-size: 0.85rem;
  margin: 0; /* reset default margin */
  z-index: 2;
}

/* Month labels under each year */
.timeline-month-label {
  margin: 8px 0 4px 60px;
  font-weight: 600;
  color: var(--color-primary);
  font-size: 0.9rem;
}

/* Indent events under their month label */
.timeline-content {
  background: #fff;
  padding: 8px 12px;
  border-radius: 4px;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
  color: var(--color-text);
  margin-bottom: 8px;
  margin-left: 80px;
}

.timeline-month {
  font-weight: 600;
  color: var(--color-primary);
  margin-right: 6px;
}

/* Social links */
.social-links {
  display: flex;
  justify-content: center;
  gap: 20px;
  margin-top: 10px;
}
.social-links a {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  text-decoration: none;
  font-size: 1.8rem;
  color: var(--color-primary);
  transition: color var(--transition-speed);
}
.link-label {
  display: block;
  font-size: 0.9rem;
  margin-top: 4px;
  color: var(--color-text);
  transition: color var(--transition-speed);
}
.social-links a:hover {
  color: #005fa3;
}
.social-links a:hover .link-label {
  color: var(--color-primary);
}

/* Limit size of social icon images */
.social-links img {
  width: 40px;
  height: 40px;
  object-fit: contain;
  transition: transform var(--transition-speed) ease;
}

/* Slight scale-up on hover for professional interaction */
.social-links a:hover img {
  transform: scale(1.1);
}

/* Side navigation scroll indicator */
.side-nav {
  position: fixed;
  top: 50%;
  left: 20px;
  transform: translateY(-50%);
  z-index: 10;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-speed) ease;
}
.side-nav.visible {
  opacity: 1;
  pointer-events: auto;
}
.side-nav ul {
  list-style: none;
}
.side-nav li {
  margin: 12px 0;
}
.side-nav a {
  position: relative;
  display: inline-block;
  padding-left: 20px;
  color: #555;
  text-decoration: none;
  font-size: 1rem;
  transition: color var(--transition-speed);
}
.side-nav a::before {
  content: "○";
  position: absolute;
  left: 0;
  top: 0;
  color: #aaa;
}
.side-nav a.active {
  color: var(--color-primary);
}
.side-nav a.active::before {
  content: "●";
  color: var(--color-primary);
}
@media (max-width: 800px) {
  .side-nav {
    display: none;
  }
}

@media (max-width: 600px) {
  .hero h1 {
    font-size: 2.5rem;
  }
  .project-grid {
    grid-template-columns: 1fr;
  }
  .timeline-container {
    padding: 10px 0 10px 45px;
  }
  .timeline-container::before {
    left: 15px;
  }
  .timeline-event::before {
    left: 18px;
  }
  .timeline-date {
    font-size: 0.75rem;
  }
}

/* Modal Styles */
.modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  visibility: hidden;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-speed) ease,
    visibility var(--transition-speed) ease;
  z-index: 1000;
}
.modal.show {
  visibility: visible;
  opacity: 1;
  pointer-events: auto;
}
.modal-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.6);
}
.modal-content {
  position: relative;
  background: #fff;
  border-radius: 8px;
  padding: 20px;
  max-width: 600px;
  width: 90%;
  max-height: 90%;
  overflow-y: auto;
  overflow-x: hidden;
  z-index: 10;
}
.modal-close {
  position: absolute;
  top: 12px;
  right: 12px;
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: #333;
}
.modal-img {
  width: 100%;
  max-height: 60vh;
  object-fit: contain;
  border-radius: 4px;
  display: block;
  margin: 0 auto;
  opacity: 1;
  transition: opacity 0.3s ease;
}
.modal-actions {
  margin-top: 16px;
  display: flex;
  gap: 12px;
}
.btn {
  display: inline-block;
  padding: 8px 12px;
  background: var(--color-primary);
  color: #fff;
  text-decoration: none;
  border-radius: 4px;
  transition: background var(--transition-speed);
}
.btn:hover {
  background: #005fa3;
}

/* Modal slider styles */
.modal-slider {
  position: relative;
  width: 100%;
  margin-bottom: 12px;
  overflow: hidden;
}
.modal-arrow {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  background: rgba(0, 0, 0, 0.4);
  color: #fff;
  border: none;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  z-index: 2;
}
.modal-prev {
  left: 8px;
}
.modal-next {
  right: 8px;
}
.modal-arrow:disabled {
  opacity: 0.4;
  cursor: default;
}

/* Professional Footer */
.site-footer {
  background: #1a1a1a;
  color: #ccc;
  padding: 20px 0;
}
.site-footer .footer-inner {
  max-width: 1000px;
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
  padding: 0 20px;
}
.footer-nav {
  display: flex;
  gap: 16px;
}
.footer-nav a {
  color: #ccc;
  text-decoration: none;
  font-size: 0.95rem;
  transition: color var(--transition-speed);
}
.footer-nav a:hover {
  color: #fff;
}
.footer-attribution {
  font-size: 0.8rem;
  color: #777;
  text-align: center;
  flex: 1 1 100%;
}
.footer-copy {
  font-size: 0.85rem;
  color: #777;
}
@media (max-width: 600px) {
  .site-footer .footer-inner {
    flex-direction: column;
    text-align: center;
  }
  .footer-nav {
    justify-content: center;
  }
  .footer-copy {
    margin-top: 8px;
  }
}

/* Connect / Contact styles */
.contact-note {
  text-align: center;
  margin: 0 auto 16px;
  max-width: 600px;
}