/* Uniform rectangular size for e-portfolio images */
.eportfolio-img {
  width: 100%;
  max-width: 400px;
  aspect-ratio: 5 / 3;
  height: auto;
  min-height: 180px;
  object-fit: cover;
  object-position: top center;
  border-radius: .8rem;
  display: block;
  margin-left: auto;
  margin-right: auto;
}
/* Video row for side-by-side embedded videos */
.video-row {
  display: flex;
  gap: 1.5rem;
  margin: 2.5rem 0;
  justify-content: center;
}
.video-row .embed-frame {
  flex: 1 1 0;
  min-width: 0;
  max-width: 500px;
  aspect-ratio: 16 / 9;
}
@media (max-width: 900px) {
  .video-row {
    flex-direction: column;
    gap: 1rem;
  }
  .video-row .embed-frame {
    max-width: 100%;
  }
}
/* Base styles and dark-mode friendly variables */
:root {
  --color-bg: #ffffff;
  --color-text: #111827;
  --color-muted: #6b7280;
  --color-accent: #2563eb;
  --color-card-bg: #f9fafb;
}
@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #111827;
    --color-text: #f3f4f6;
    --color-muted: #9ca3af;
    --color-card-bg: #1f2937;
  }
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: 'Inter', sans-serif;
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
}

/* Container for consistent widths */
.container {
  width: 90%;
  max-width: 1000px;
  margin-left: auto;
  margin-right: auto;
}

/* Navigation styling */
header {
  background-color: var(--color-bg);
  padding: 1rem 0;
  border-bottom: 1px solid rgba(0, 0, 0, 0.1);
  position: sticky;
  top: 0;
  z-index: 10;
}

.nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav a {
  margin-left: 1rem;
  text-decoration: none;
  color: var(--color-text);
  font-weight: 500;
}

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

.logo {
  font-family: 'Source Serif Pro', serif;
  font-size: 1.5rem;
  font-weight: 600;
  text-decoration: none;
  color: var(--color-text);
}

/* Hero section styling */
.hero {
  padding: 4rem 0;
  background-image: linear-gradient(to bottom right, rgba(37, 99, 235, 0.1), rgba(37, 99, 235, 0.05));
}
.hero h1 {
  font-family: 'Source Serif Pro', serif;
  font-size: 2.5rem;
  margin-bottom: 0.5rem;
}
.hero .subtitle {
  font-size: 1.2rem;
  color: var(--color-accent);
  margin-bottom: 1rem;
}
.hero .cta {
  margin-top: 1.5rem;
}
.hero-image {
  width: 200px;
  height: 250px;
  object-fit: cover;
  border-radius: 50%;
  display: block;
  margin: 0 1.2rem 1.2rem 0;
  box-shadow: 0 2px 12px rgba(37, 99, 235, 0.10);
  border: 3px solid var(--color-card-bg);
  float: left;  
}
.button {
  display: inline-block;
  background-color: var(--color-accent);
  color: #ffffff;
  padding: 0.6rem 1rem;
  border-radius: 6px;
  text-decoration: none;
  font-weight: 500;
  margin-right: 0.5rem;
}
.button.secondary {
  background-color: transparent;
  color: var(--color-accent);
  border: 2px solid var(--color-accent);
}
.button:hover {
  opacity: 0.85;
}

/* Highlights and cards */
.highlights {
  padding: 3rem 0;
}
.highlights h2 {
  font-family: 'Source Serif Pro', serif;
  font-size: 1.8rem;
  margin-bottom: 1.5rem;
}
.cards {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}
.card {
  flex: 1 1 300px;
  background-color: var(--color-card-bg);
  padding: 1.5rem;
  border-radius: 8px;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.05);
}
.card h3 {
  margin-top: 0;
  margin-bottom: 0.5rem;
  font-size: 1.2rem;
}
.card ul {
  padding-left: 1.2rem;
}
.card a {
  color: var(--color-accent);
  text-decoration: none;
}
.card a:hover {
  text-decoration: underline;
}

/* Footer styling */
footer {
  padding: 2rem 0;
  background-color: var(--color-bg);
  border-top: 1px solid rgba(0, 0, 0, 0.1);
  margin-top: 3rem;
}
.footer-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}
.footer-content p {
  margin: 0;
}
.footer-content ul {
  list-style: none;
  padding: 0;
  margin: 1rem 0 0 0;
  display: flex;
  gap: 1rem;
}
.footer-content a {
  color: var(--color-accent);
  text-decoration: none;
}
.footer-content a:hover {
  text-decoration: underline;
}

/* Page heading styles */
main h1 {
  font-family: 'Source Serif Pro', serif;
  font-size: 2rem;
  margin-top: 2rem;
  margin-bottom: 1rem;
}
main h2 {
  font-family: 'Source Serif Pro', serif;
  font-size: 1.5rem;
  margin-top: 1.5rem;
  margin-bottom: 0.5rem;
}
main ul,
main ol {
  padding-left: 1.2rem;
}
main li {
  margin-bottom: 0.5rem;
}
main section {
  margin-bottom: 2rem;
}

/* Additional styles for e‑portfolio gallery and teaching page */
.muted {
  color: var(--color-muted);
}
.serif {
  font-family: 'Source Serif Pro', serif;
}
.h6 {
  font-size: .95rem;
}
.h5 {
  font-size: 1.05rem;
}
.image-grid {
  display: grid;
  gap: .8rem;
  grid-template-columns: repeat(2, 1fr);
}
.image-grid figure {
  margin: 0;
}
.image-grid img {
  width: 100%;
  border-radius: .8rem;
  display: block;
}
.image-grid figcaption {
  font-size: .85rem;
  margin-top: .35rem;
  color: var(--color-muted);
}
@media (min-width: 900px) {
  .image-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}
.section {
  margin: 3rem 0;
}
.section-title {
  margin-bottom: .75rem;
  font-family: 'Source Serif Pro', serif;
  font-size: 1.8rem;
}
.grid-2 {
  display: grid;
  gap: 1.25rem;
  grid-template-columns: 1fr;
}
.grid-3 {
  display: grid;
  gap: 1.25rem;
  grid-template-columns: 1fr;
}
@media (min-width: 860px) {
  .grid-2 {
    grid-template-columns: 1fr 1fr;
  }
  .grid-3 {
    grid-template-columns: 1fr 1fr 1fr;
  }
}
.card-tight {
  padding: .75rem 1rem;
}
.callout {
  background-color: var(--color-card-bg);
  border: 1px solid rgba(0, 0, 0, 0.1);
  border-radius: 1rem;
  padding: 1rem;
}
.callout-kpi {
  font-size: 1.6rem;
  font-weight: 700;
}
.callout-meta {
  font-size: .9rem;
  color: var(--color-muted);
  margin-top: .25rem;
}
.quote-list {
  margin: .25rem 0 0 1.1rem;
}
.embed-frame {
  aspect-ratio: 16 / 9;
  background-color: var(--color-card-bg);
  border: 1px solid rgba(0, 0, 0, 0.1);
  border-radius: .75rem;
  overflow: hidden;
}
.embed-frame iframe {
  width: 100%;
  height: 100%;
  border: 0;
  background: #ffffff;
}
.two-col {
  columns: 2;
}

/* Responsive adjustments */
@media (max-width: 600px) {
  .nav {
    flex-direction: column;
    align-items: flex-start;
  }
  .nav a {
    margin-left: 0;
    margin-right: 1rem;
  }
  .cards {
    flex-direction: column;
  }
  .hero {
    padding: 3rem 0;
  }
  .hero h1 {
    font-size: 2rem;
  }
}