@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600&family=Plus+Jakarta+Sans:wght@500;600;700&display=swap');

:root {
  --bg-primary: #f8fafc;
  --bg-surface: #ffffff;
  --text-main: #0f172a;
  --text-muted: #475569;
  --text-subtle: #64748b;
  --accent: #0284c7;
  --accent-hover: #0369a1;
  --accent-subtle: #f0f9ff;
  --border: #e2e8f0;
  --border-focus: #cbd5e1;

  --shadow-sm: 0 1px 2px 0 rgba(15, 23, 42, 0.04);
  --shadow-card: 0 4px 20px -2px rgba(15, 23, 42, 0.05);

  --font-main: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-heading: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, sans-serif;

  --max-width: 900px;
  --radius: 6px;
  --transition: all 0.15s ease-in-out;
}

/* layout */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
  background-color: var(--bg-primary);
}

body {
  background-color: var(--bg-primary);
  color: var(--text-main);
  font-family: var(--font-main);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 6rem 1.5rem 3rem 1.5rem;
}

h1, h2, h3, h4 {
  font-family: var(--font-heading);
  color: var(--text-main);
  font-weight: 700;
  letter-spacing: -0.02em;
}

h1 { font-size: 2.1rem; line-height: 1.25; margin-bottom: 0.75rem; }
h2 { 
  font-size: 1.05rem; 
  text-transform: uppercase; 
  letter-spacing: 0.08em; 
  color: var(--accent); 
  margin-bottom: 1.5rem;
  font-weight: 700;
}
h3 { font-size: 1.15rem; font-weight: 600; }

p {
  color: var(--text-muted);
  font-size: 0.98rem;
  margin-bottom: 1rem;
}

a {
  color: var(--accent);
  text-decoration: underline;
  text-decoration-color: rgba(2, 132, 199, 0.3);
  text-underline-offset: 4px;
  transition: var(--transition);
}

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

.section {
  padding: 2rem 0;
  border-bottom: 1px solid var(--border);
}

.section:last-of-type {
  border-bottom: none;
}

/* header */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 58px;
  background-color: rgba(255, 255, 255, 0.88);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 2rem;
  z-index: 1000;
  box-shadow: var(--shadow-sm);
}

.nav-brand a {
  font-family: var(--font-heading);
  color: var(--text-main);
  font-weight: 700;
  font-size: 0.95rem;
  text-decoration: none;
  letter-spacing: -0.01em;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.75rem;
}

.nav-links a {
  font-family: var(--font-heading);
  color: var(--text-muted);
  font-size: 0.88rem;
  font-weight: 500;
  text-decoration: none;
  transition: var(--transition);
}

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

.dropdown {
  position: relative;
}

.dropdown-content {
  display: none;
  position: absolute;
  top: 100%;
  right: 0;
  background-color: var(--bg-surface);
  min-width: 220px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.35rem 0;
  box-shadow: var(--shadow-card);
}

.dropdown-content a {
  display: block;
  padding: 0.5rem 1rem;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.dropdown-content a:hover {
  background-color: var(--accent-subtle);
  color: var(--accent);
}

.dropdown:hover .dropdown-content {
  display: block;
}

/* about */
.about-container {
  display: grid;
  grid-template-columns: 1fr 200px;
  gap: 3rem;
  align-items: center;
}

.about-image img {
  width: 200px;
  height: 200px;
  object-fit: cover;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-card);
  transition: var(--transition);
}

/* experience */
.experience-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: none;
}

.experience-list {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.experience-item {
  font-size: 0.95rem;
  line-height: 1.4;
  color: var(--text-main);
}

.company-link {
  font-weight: 600;
  color: var(--text-main);
  text-decoration: none;
  transition: var(--transition);
}

.company-link:hover {
  color: var(--accent);
}

.company-name {
  font-weight: 600;
  color: var(--text-main);
}

.ext-icon {
  font-size: 0.85em;
  margin-left: 2px;
  display: inline-block;
  color: var(--text-subtle);
  transition: var(--transition);
}

.company-link:hover .ext-icon {
  color: var(--accent);
  transform: translate(1px, -1px);
}

.role-details {
  font-style: italic;
  color: var(--text-muted);
}

.timeframe {
  font-style: normal;
  color: var(--text-subtle);
  margin-left: 2px;
}

/* education */
.education-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
}

.hidden {
  display: none !important;
}

.education-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 1rem;
  margin-bottom: 1.25rem;
}

.eduction-uni-name {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-bottom: 0;
}

.eduction-gpa-badge {
  font-family: var(--font-heading);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
  padding: 0.25rem 0.65rem;
  white-space: nowrap;
}

.courses-container {
  margin-top: 1.25rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--border);
}

.courses-container h4 {
  font-family: var(--font-heading);
  font-size: 0.88rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-subtle);
  margin-bottom: 1rem;
}

.education-gpa-badge {
  font-family: var(--font-heading);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--accent);
  background-color: var(--accent-subtle);
  border: 1px solid rgba(2, 132, 199, 0.2);
  padding: 0.25rem 0.65rem;
  border-radius: var(--radius);
}

.btn {
  display: inline-block;
  background-color: var(--bg-surface);
  color: var(--text-main);
  border: 1px solid var(--border);
  padding: 0.4rem 0.85rem;
  border-radius: var(--radius);
  font-size: 0.85rem;
  font-family: var(--font-heading);
  font-weight: 500;
  cursor: pointer;
  text-decoration: none;
  transition: var(--transition);
}

.btn:hover {
  background-color: var(--accent-subtle);
  color: var(--accent);
  border-color: rgba(2, 132, 199, 0.3);
}

.courses-columns {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1.25rem 1.5rem;
  margin-bottom: 1rem;
}

.course-group h5 {
  font-family: var(--font-heading);
  font-size: 0.78rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--accent);
  margin-bottom: 0.4rem;
  border-bottom: 1px dashed var(--border);
  padding-bottom: 0.2rem;
}

.course-group ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.course-group li {
  font-size: 0.8rem;
  line-height: 1.35;
  color: var(--text-muted);
  padding: 0.15rem 0;
  display: flex;
  align-items: center;
}

.course-group li::before {
  content: "•";
  color: var(--text-subtle);
  font-size: 0.75rem;
  margin-right: 0.4rem;
}

.curriculum-link-wrapper {
  margin-top: 1rem;
  padding-top: 0.75rem;
  border-top: 1px solid var(--border);
}

.curriculum-link {
  font-family: var(--font-heading);
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--accent);
  text-decoration: none;
  transition: var(--transition);
}

.curriculum-link:hover {
  text-decoration: underline;
  color: var(--text-main);
}

/* projects */
.project-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
}

.project-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  height: 100%;
}

.project-card img {
  width: 100%;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  border-radius: calc(var(--radius) - 2px);
  border: 1px solid var(--border);
  margin-bottom: 1rem;
}

.project-card h3 {
  font-size: 1.05rem;
  margin-bottom: 0.5rem;
}

.project-card p {
  font-size: 0.88rem;
  flex-grow: 1;
  margin-bottom: 1.25rem;
}

.project-card .btn {
  text-align: center;
  align-self: flex-start;
  width: 100%;
}

@media (max-width: 868px) {
  .project-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 580px) {
  .project-grid {
    grid-template-columns: 1fr;
  }
}

.project-detail {
  max-width: var(--max-width);
  margin: 0 auto;
  padding-top: 6rem;
}

.project-header {
  margin-bottom: 2rem;
}

.subtitle {
  font-family: var(--font-heading);
  font-size: 0.95rem;
  color: var(--text-muted);
  font-weight: 600;
  margin-top: -0.25rem;
}

.cad-container {
  margin-bottom: 2.5rem;
}

.cad-window {
  width: 100%;
  height: 480px;
  background-color: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  margin-top: 0.75rem;
}

.cad-window model-viewer {
  width: 100%;
  height: 100%;
  --poster-color: transparent;
}

.project-gallery {
  width: 100%;
}

.image-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 1.25rem;
  width: 100%;
}

.gallery-item {
  flex: 1 1 calc(50% - 0.625rem); 
  min-width: 260px;
  max-width: 100%;
  
  background-color: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.75rem;
  display: flex;
  flex-direction: column;
  cursor: pointer;
  transition: border-color 0.15s ease, transform 0.15s ease;
}

.gallery-item:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
}

.gallery-item img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  background-color: var(--bg-primary);
  border-radius: calc(var(--radius) - 2px);
  border: 1px solid var(--border);
}

.gallery-item figcaption {
  font-family: var(--font-heading);
  font-size: 0.82rem;
  color: var(--text-subtle);
  margin-top: 0.6rem;
  line-height: 1.4;
  text-align: center;
}

.lightbox {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background-color: var(--bg-surface);
  color: var(--text-main);
  padding: 1.25rem;
  max-width: 90vw;
  max-height: 90vh;
  margin: auto;
  box-shadow: var(--shadow-card);
  outline: none;
}

.lightbox::backdrop {
  background-color: rgba(15, 23, 42, 0.65);
  backdrop-filter: blur(4px);
}

.lightbox img {
  max-width: 100%;
  max-height: 70vh;
  display: block;
  margin: 0 auto;
  border-radius: calc(var(--radius) - 2px);
  object-fit: contain;
}

.lightbox p {
  font-family: var(--font-heading);
  font-size: 0.88rem;
  color: var(--text-muted);
  text-align: center;
  margin-top: 1rem;
  margin-bottom: 0;
}

.lightbox-close {
  position: absolute;
  top: 0.5rem;
  right: 0.75rem;
  background: transparent;
  border: none;
  font-size: 1.5rem;
  color: var(--text-subtle);
  cursor: pointer;
  line-height: 1;
  padding: 0.25rem;
}

.lightbox-close:hover {
  color: var(--accent);
}

/* ==========================================================================
   CONTACT SECTION STYLES
   ========================================================================== */
.contact-links {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  margin-top: 1rem;
}

.contact-item {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  color: var(--text-muted);
  font-size: 0.95rem;
  text-decoration: none;
  width: fit-content;
  transition: var(--transition);
}

.contact-icon {
  width: 18px;
  height: 18px;
  stroke: var(--accent);
  flex-shrink: 0;
  transition: var(--transition);
}

.contact-item span {
  color: var(--text-muted);
  text-decoration: underline;
  text-decoration-color: rgba(2, 132, 199, 0.3);
  text-underline-offset: 4px;
  transition: var(--transition);
}

.contact-item:hover span {
  color: var(--accent);
  text-decoration-color: var(--accent-hover);
}

.contact-item:hover .contact-icon {
  transform: translateY(-1px);
}

/* footer */
footer {
  text-align: center;
  padding: 3rem 0;
  color: var(--text-subtle);
  font-family: var(--font-heading);
  font-size: 0.82rem;
  border-top: 1px solid var(--border);
}

@media (max-width: 768px) {
  .about-container {
    grid-template-columns: 1fr;
  }
  .about-image {
    order: -1;
  }
  .about-image img {
    width: 140px;
    height: 140px;
  }
}