/* ============================================
   Alexi Gugushvili — Academic Website
   Modern, polished design
   ============================================ */

:root {
  --color-bg: #ffffff;
  --color-bg-alt: #f7f8fa;
  --color-text: #1a1a2e;
  --color-text-light: #555566;
  --color-accent: #2d5a8e;
  --color-accent-dark: #1e3f66;
  --color-accent-light: #e8f0fa;
  --color-border: #e2e4e8;
  --color-card-shadow: rgba(0, 0, 0, 0.06);
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-serif: 'Source Serif 4', Georgia, 'Times New Roman', serif;
  --max-width: 1080px;
  --header-height: 72px;
}

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

html { font-size: 16px; scroll-behavior: smooth; }

body {
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }
a { color: var(--color-accent); text-decoration: none; transition: color 0.2s; }
a:hover { color: var(--color-accent-dark); }

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
  height: var(--header-height);
}

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 2rem;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.site-logo {
  font-family: var(--font-serif);
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: -0.02em;
}
.site-logo:hover { color: var(--color-accent); }

.nav-menu {
  display: flex;
  gap: 2rem;
}

.nav-menu a {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text-light);
  letter-spacing: 0.01em;
  padding: 0.3rem 0;
  border-bottom: 2px solid transparent;
  transition: all 0.2s;
}
.nav-menu a:hover,
.nav-menu a.active {
  color: var(--color-accent);
  border-bottom-color: var(--color-accent);
}

.menu-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  flex-direction: column;
  gap: 5px;
  padding: 4px;
}
.menu-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text);
  transition: 0.2s;
}

/* Hero */
.hero {
  padding: 5rem 2rem 4rem;
  background: linear-gradient(135deg, var(--color-bg) 0%, var(--color-accent-light) 100%);
}

.hero-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 4rem;
  align-items: center;
}

.hero h1 {
  font-family: var(--font-serif);
  font-size: 2.8rem;
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.03em;
  color: var(--color-text);
  margin-bottom: 0.5rem;
}

.hero-subtitle {
  font-size: 1.25rem;
  font-weight: 500;
  color: var(--color-accent);
  margin-bottom: 0.25rem;
}

.hero-affiliation {
  font-size: 1rem;
  color: var(--color-text-light);
  margin-bottom: 1.5rem;
  line-height: 1.5;
}

.hero-intro {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  color: var(--color-text);
  line-height: 1.75;
  margin-bottom: 2rem;
  max-width: 600px;
}

.hero-links { display: flex; gap: 1rem; flex-wrap: wrap; }

.hero-photo { display: flex; justify-content: center; }

.hero-photo .about-photo {
  width: 280px;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 4px 20px var(--color-card-shadow);
}
.hero-photo .about-photo img {
  width: 100%;
  height: auto;
}

/* Buttons */
.btn {
  display: inline-block;
  padding: 0.7rem 1.6rem;
  font-size: 0.9rem;
  font-weight: 600;
  border-radius: 8px;
  transition: all 0.2s;
  letter-spacing: 0.01em;
}
.btn-primary {
  background: var(--color-accent);
  color: #fff;
}
.btn-primary:hover {
  background: var(--color-accent-dark);
  color: #fff;
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(45, 90, 142, 0.3);
}
.btn-outline {
  border: 2px solid var(--color-accent);
  color: var(--color-accent);
}
.btn-outline:hover {
  background: var(--color-accent);
  color: #fff;
  transform: translateY(-1px);
}

/* Home Sections */
.home-section {
  padding: 4rem 2rem;
}
.home-section.alt-bg {
  background: var(--color-bg-alt);
}
.section-inner {
  max-width: var(--max-width);
  margin: 0 auto;
}
.home-section h2 {
  font-family: var(--font-serif);
  font-size: 1.8rem;
  font-weight: 700;
  margin-bottom: 2rem;
  letter-spacing: -0.02em;
}

/* Research Cards */
.research-cards {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
}
.card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 2rem;
  transition: all 0.25s;
}
.card:hover {
  border-color: var(--color-accent);
  box-shadow: 0 4px 20px var(--color-card-shadow);
  transform: translateY(-2px);
}
.card-icon {
  font-size: 1.8rem;
  margin-bottom: 0.75rem;
}
.card h3 {
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: var(--color-text);
}
.card p {
  font-size: 0.92rem;
  color: var(--color-text-light);
  line-height: 1.6;
}

/* Publication list on home */
.pub-list-home { display: flex; flex-direction: column; gap: 1.25rem; }
.pub-item {
  display: flex;
  gap: 1.5rem;
  padding: 1.25rem 1.5rem;
  background: var(--color-bg);
  border-radius: 10px;
  border: 1px solid var(--color-border);
  transition: all 0.2s;
}
.pub-item:hover {
  border-color: var(--color-accent);
  box-shadow: 0 2px 12px var(--color-card-shadow);
}
.pub-year {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--color-accent);
  min-width: 48px;
  padding-top: 2px;
}
.pub-title {
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--color-text);
  margin-bottom: 0.25rem;
  line-height: 1.4;
}
.pub-authors {
  font-size: 0.85rem;
  color: var(--color-text-light);
  margin-bottom: 0.15rem;
}
.pub-journal {
  font-size: 0.85rem;
  color: var(--color-accent);
  font-style: italic;
}

/* Page Content */
.page-content {
  padding: 3rem 2rem 4rem;
}
.page-inner {
  max-width: var(--max-width);
  margin: 0 auto;
}
.page-inner h1 {
  font-family: var(--font-serif);
  font-size: 2.2rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 2rem;
  padding-bottom: 1rem;
  border-bottom: 3px solid var(--color-accent);
}
.page-inner h2 {
  font-family: var(--font-serif);
  font-size: 1.4rem;
  font-weight: 600;
  margin: 2.5rem 0 1rem;
  color: var(--color-text);
}
.page-inner h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin: 1.5rem 0 0.5rem;
  color: var(--color-accent-dark);
}
.page-inner p {
  font-family: var(--font-serif);
  font-size: 1.05rem;
  line-height: 1.8;
  margin-bottom: 1.25rem;
  color: var(--color-text);
}
.page-inner ul, .page-inner ol {
  margin: 1rem 0 1.5rem 1.5rem;
  font-family: var(--font-serif);
  font-size: 1.05rem;
  line-height: 1.8;
}
.page-inner li {
  margin-bottom: 0.5rem;
}

/* Publication page styles */
.pub-section { margin-bottom: 3rem; }
.pub-section h2 {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.pub-section h2::before {
  content: '';
  width: 4px;
  height: 1.3em;
  background: var(--color-accent);
  border-radius: 2px;
  display: inline-block;
}
.pub-entry {
  padding: 1rem 0;
  border-bottom: 1px solid var(--color-border);
}
.pub-entry:last-child { border-bottom: none; }
.pub-entry p {
  font-family: var(--font-sans);
  font-size: 0.95rem;
  line-height: 1.6;
  margin-bottom: 0.25rem;
}
.pub-entry .pub-title {
  font-weight: 600;
  color: var(--color-text);
  font-size: 1rem;
}
.pub-entry .pub-journal {
  font-style: italic;
  color: var(--color-accent);
}
.pub-entry a.pub-link {
  font-size: 0.82rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-right: 0.75rem;
}

/* About page two-column */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: 3rem;
  align-items: start;
}
.about-photo {
  width: 100%;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 4px 20px var(--color-card-shadow);
  position: sticky;
  top: calc(var(--header-height) + 2rem);
}
.about-photo img {
  width: 100%;
  height: auto;
}

/* Info box */
.info-box {
  background: var(--color-accent-light);
  border-left: 4px solid var(--color-accent);
  padding: 1.25rem 1.5rem;
  border-radius: 0 8px 8px 0;
  margin: 1.5rem 0;
}
.info-box p {
  font-family: var(--font-sans);
  font-size: 0.92rem;
  margin-bottom: 0.25rem;
}

/* Teaching table */
.teaching-table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
  font-family: var(--font-sans);
}
.teaching-table th {
  text-align: left;
  padding: 0.75rem 1rem;
  background: var(--color-accent);
  color: #fff;
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.teaching-table th:first-child { border-radius: 8px 0 0 0; }
.teaching-table th:last-child { border-radius: 0 8px 0 0; }
.teaching-table td {
  padding: 0.75rem 1rem;
  font-size: 0.92rem;
  border-bottom: 1px solid var(--color-border);
}
.teaching-table tr:hover td {
  background: var(--color-bg-alt);
}

/* Media outlet badges */
.media-outlets {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin: 2rem 0;
}
.media-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.6rem 1.2rem;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-text);
  background: var(--color-bg);
  transition: all 0.2s;
  text-decoration: none;
}
.media-badge:hover {
  border-color: var(--color-accent);
  box-shadow: 0 2px 8px var(--color-card-shadow);
  transform: translateY(-1px);
  color: var(--color-text);
}
.media-badge img {
  height: 20px;
  width: auto;
}

/* Media coverage entry with outlet label */
.media-entry {
  padding: 1.25rem 1.5rem;
  border: 1px solid var(--color-border);
  border-radius: 10px;
  margin-bottom: 1rem;
  transition: all 0.2s;
}
.media-entry:hover {
  border-color: var(--color-accent);
  box-shadow: 0 2px 12px var(--color-card-shadow);
}
.media-outlet {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-accent);
  margin-bottom: 0.4rem;
}
.media-headline {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 0.3rem;
  line-height: 1.4;
}
.media-description {
  font-size: 0.88rem;
  color: var(--color-text-light);
  line-height: 1.5;
  margin-bottom: 0.4rem;
}
.media-link {
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--color-border);
  padding: 2.5rem 2rem;
  background: var(--color-bg-alt);
}
.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  text-align: center;
}
.footer-links {
  display: flex;
  justify-content: center;
  gap: 2rem;
  margin-bottom: 1rem;
  flex-wrap: wrap;
}
.footer-links a {
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--color-text-light);
}
.footer-links a:hover { color: var(--color-accent); }
.footer-copy {
  font-size: 0.82rem;
  color: var(--color-text-light);
}

/* Responsive */
@media (max-width: 768px) {
  .menu-toggle { display: flex; }
  .nav-menu {
    display: none;
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: var(--color-bg);
    flex-direction: column;
    padding: 1rem 2rem 1.5rem;
    border-bottom: 1px solid var(--color-border);
    gap: 0.75rem;
    box-shadow: 0 4px 20px var(--color-card-shadow);
  }
  .nav-menu.open { display: flex; }

  .hero { padding: 3rem 1.5rem; }
  .hero-inner {
    grid-template-columns: 1fr;
    gap: 2rem;
    text-align: center;
  }
  .hero h1 { font-size: 2rem; }
  .hero-intro { max-width: 100%; }
  .hero-links { justify-content: center; }
  .hero-photo { order: -1; }
  .photo-placeholder { width: 200px; height: 240px; }

  .research-cards { grid-template-columns: 1fr; }
  .about-grid { grid-template-columns: 1fr; }
  .about-photo { position: static; max-width: 250px; margin: 0 auto 2rem; }

  .pub-item { flex-direction: column; gap: 0.5rem; }

  .teaching-table { font-size: 0.85rem; }
  .teaching-table th, .teaching-table td { padding: 0.5rem 0.6rem; }
}