/* ========================================
   Site Stylesheet — mohanadodema.github.io
   ======================================== */

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

:root {
  --bg-primary: #ffffff;
  --bg-secondary: #f5f7fa;
  --bg-nav: #fafafa;
  --text-primary: #2d2d2d;
  --text-secondary: #5a5a6e;
  --text-muted: #8c8c9e;
  --accent-heading: #1a1a2e;
  --accent-link: #4a6fa5;
  --accent-link-hover: #2c4a7c;
  --accent-highlight: #4a6fa5;
  --border-subtle: #e2e2e8;
  --nav-height: 56px;
  --content-max-width: 800px;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  font-size: 16px;
  line-height: 1.7;
  color: var(--text-primary);
  background: var(--bg-primary);
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--accent-link);
  text-decoration: none;
  transition: color 0.2s;
}

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

img {
  max-width: 100%;
  height: auto;
}

h1, h2, h3, h4 {
  color: var(--accent-heading);
  font-weight: 600;
  line-height: 1.3;
}

h1 { font-size: clamp(1.75rem, 3vw, 2rem); }
h2 { font-size: clamp(1.25rem, 2.5vw, 1.5rem); margin-bottom: 1rem; }
h3 { font-size: 1.125rem; margin-bottom: 0.75rem; }
h4 { font-size: 1rem; margin-bottom: 0.5rem; color: var(--text-secondary); }

p {
  margin-bottom: 1rem;
}

/* --- Navigation --- */
.site-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  background: var(--bg-nav);
  border-bottom: 1px solid var(--border-subtle);
  z-index: 100;
  display: flex;
  align-items: center;
}

.nav-inner {
  width: 100%;
  max-width: var(--content-max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-brand {
  font-weight: 600;
  font-size: 1.1rem;
  color: var(--accent-heading);
  text-decoration: none;
}

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

.nav-links {
  list-style: none;
  display: flex;
  gap: 1.75rem;
  align-items: center;
}

.nav-links a {
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
  text-decoration: none;
  padding-bottom: 2px;
  border-bottom: 2px solid transparent;
  transition: color 0.2s, border-color 0.2s;
}

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

.nav-links a.active {
  color: var(--accent-highlight);
  border-bottom-color: var(--accent-highlight);
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
  color: var(--text-primary);
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text-primary);
  margin: 5px 0;
  transition: transform 0.3s, opacity 0.3s;
}

/* --- Main Content --- */
.site-main {
  max-width: var(--content-max-width);
  margin: 0 auto;
  padding: calc(var(--nav-height) + 3rem) 1.5rem 3rem;
}

/* --- Footer --- */
.site-footer {
  max-width: var(--content-max-width);
  margin: 0 auto;
  padding: 2rem 1.5rem;
  border-top: 1px solid var(--border-subtle);
  text-align: center;
  color: var(--text-muted);
  font-size: 0.85rem;
}

.footer-icons {
  list-style: none;
  display: flex;
  justify-content: center;
  gap: 1.25rem;
  margin-bottom: 0.75rem;
}

.footer-icons a {
  color: var(--text-muted);
  font-size: 1.25rem;
  transition: color 0.2s;
}

.footer-icons a:hover {
  color: var(--accent-link);
}

/* --- About Page --- */
.about-header {
  display: flex;
  align-items: center;
  gap: 2rem;
  margin-bottom: 2rem;
}

.about-avatar {
  width: 140px;
  height: 140px;
  border-radius: 50%;
  object-fit: cover;
  flex-shrink: 0;
}

.about-title h1 {
  margin-bottom: 0.25rem;
}

.about-subtitle {
  color: var(--text-secondary);
  font-size: 1.05rem;
}

.about-body p {
  margin-bottom: 1.25rem;
}

.contact-row {
  margin-top: 2rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border-subtle);
}

.contact-row .contact-email {
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin-bottom: 0.75rem;
}

.contact-icons {
  list-style: none;
  display: flex;
  gap: 1.25rem;
}

.contact-icons a {
  color: var(--text-secondary);
  font-size: 1.4rem;
  transition: color 0.2s;
}

.contact-icons a:hover {
  color: var(--accent-link);
}

/* --- Publications Page --- */
.pub-header {
  display: flex;
  align-items: baseline;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.pub-header .scholar-link {
  font-size: 0.95rem;
}

.pub-section {
  margin-bottom: 2.5rem;
}

.pub-list {
  list-style: decimal;
  padding-left: 1.5rem;
}

.pub-list li {
  margin-bottom: 1.25rem;
  line-height: 1.6;
}

.pub-title {
  font-size: 1rem;
}

.pub-title a {
  color: var(--accent-link);
}

.pub-title a:hover {
  color: var(--accent-link-hover);
}

.pub-authors {
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.pub-authors .me {
  color: var(--accent-heading);
  font-weight: 600;
}

.pub-venue {
  font-size: 0.875rem;
  color: var(--text-muted);
}

/* --- Things I Like Hub --- */
.hub-intro {
  margin-bottom: 2.5rem;
}

.hub-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.hub-card {
  display: block;
  padding: 2rem 1.5rem;
  border: 1px solid var(--border-subtle);
  border-radius: 8px;
  text-align: center;
  text-decoration: none;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.hub-card:hover {
  border-color: var(--accent-link);
  box-shadow: 0 2px 12px rgba(74, 111, 165, 0.1);
}

.hub-card-title {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--accent-heading);
  margin-bottom: 0.5rem;
}

.hub-card-desc {
  font-size: 0.875rem;
  color: var(--text-secondary);
}

/* --- Sub-page back link --- */
.back-link {
  display: inline-block;
  margin-bottom: 2rem;
  font-size: 0.9rem;
  color: var(--text-muted);
}

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

/* --- Books Page --- */
.book-list {
  list-style: none;
}

.book-item {
  margin-bottom: 0.5rem;
}

.book-title {
  font-weight: 600;
  color: var(--accent-heading);
  font-size: 1rem;
  display: inline;
}

.book-author {
  color: var(--text-muted);
  font-size: 0.9rem;
  display: inline;
}

.book-note {
  color: var(--text-primary);
  font-size: 0.95rem;
}

/* --- Page Subtitle (inline with h2) --- */
.page-subtitle {
  font-size: 0.875rem;
  font-weight: 400;
  color: var(--text-muted);
  margin-left: 0.5rem;
}

/* --- Quotes Page --- */
.quote-list {
  list-style: none;
}

.quote-item {
  margin-bottom: 2rem;
  padding-left: 1.25rem;
  border-left: 3px solid var(--border-subtle);
}

.quote-text {
  font-size: 1.05rem;
  font-style: italic;
  color: var(--text-primary);
  line-height: 1.8;
  margin-bottom: 0.5rem;
}

.quote-attribution {
  font-size: 0.875rem;
  color: var(--text-muted);
}

/* --- Photography Page --- */
.photo-masonry {
  columns: 3;
  column-gap: 0.75rem;
}

.photo-masonry img {
  width: 100%;
  display: block;
  margin-bottom: 0.75rem;
  border-radius: 4px;
}

/* --- Responsive --- */
@media (max-width: 768px) {
  .nav-toggle {
    display: block;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: var(--bg-nav);
    border-bottom: 1px solid var(--border-subtle);
    flex-direction: column;
    padding: 1rem 1.5rem;
    gap: 0.75rem;
  }

  .nav-links.open {
    display: flex;
  }

  .nav-links a {
    font-size: 1rem;
    padding: 0.5rem 0;
  }

  .about-header {
    flex-direction: column;
    text-align: center;
    gap: 1.25rem;
  }

  .about-avatar {
    width: 120px;
    height: 120px;
  }

  .contact-icons {
    justify-content: center;
  }

  .contact-row {
    text-align: center;
  }

  .hub-cards {
    grid-template-columns: 1fr;
  }

  .site-main {
    padding-top: calc(var(--nav-height) + 2rem);
  }

  .photo-masonry {
    columns: 2;
  }
}

@media (max-width: 480px) {
  .about-avatar {
    width: 100px;
    height: 100px;
  }

  .pub-list {
    padding-left: 1rem;
  }

  .photo-masonry {
    columns: 1;
  }
}