/* ==========================================================================
   Avital Pilpel Academic & Professional Website
   Clean, modern, responsive styles for GitHub Pages
   ========================================================================== */

:root {
  --bg-color: #fbfbfb;
  --surface-color: #ffffff;
  --text-color: #212529;
  --text-muted: #555e68;
  --border-color: #e9ecef;
  --link-color: #1a56db;
  --link-hover: #1e40af;
  --header-bg: #1f2937;
  --nav-text: #e5e7eb;
  --nav-hover: #ffffff;
  --nav-active: #60a5fa;
  --card-bg: #ffffff;
  --card-border: #e2e8f0;
  --max-width: 860px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg-color: #111827;
    --surface-color: #1f2937;
    --text-color: #f3f4f6;
    --text-muted: #9ca3af;
    --border-color: #374151;
    --link-color: #60a5fa;
    --link-hover: #93c5fd;
    --header-bg: #0f172a;
    --nav-text: #cbd5e1;
    --nav-hover: #ffffff;
    --nav-active: #38bdf8;
    --card-bg: #1f2937;
    --card-border: #374151;
  }
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 17px;
  line-height: 1.75;
  color: var(--text-color);
  background-color: var(--bg-color);
}

.site-header {
  background-color: var(--header-bg);
  color: #ffffff;
  padding: 2rem 1rem 1.25rem;
  text-align: center;
  border-bottom: 3px solid #2563eb;
}

.site-header h1 {
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  margin: 0 0 0.35rem 0;
}

.site-header h1 a {
  color: #ffffff;
  text-decoration: none;
}

.site-header .subtitle {
  font-size: 0.98rem;
  color: #cbd5e1;
  margin-bottom: 1.25rem;
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.5rem 1rem;
  list-style: none;
  padding: 0;
  margin: 0;
}

.site-nav a {
  color: var(--nav-text);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
  padding: 0.4rem 0.75rem;
  border-radius: 4px;
  transition: background-color 0.15s ease, color 0.15s ease;
}

.site-nav a:hover {
  color: var(--nav-hover);
  background-color: rgba(255, 255, 255, 0.12);
}

.site-nav a.active {
  color: var(--nav-active);
  font-weight: 600;
  background-color: rgba(96, 165, 250, 0.15);
}

.container {
  max-width: var(--max-width);
  margin: 2.25rem auto;
  padding: 0 1.25rem;
}

.page-title {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 1.5rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--border-color);
  color: var(--text-color);
}

h2 {
  font-size: 1.45rem;
  margin-top: 2rem;
  margin-bottom: 0.75rem;
  color: var(--text-color);
}

h3 {
  font-size: 1.25rem;
  margin-top: 1.75rem;
  margin-bottom: 0.5rem;
  color: var(--text-color);
}

p {
  margin-bottom: 1.35rem;
}

a {
  color: var(--link-color);
  text-decoration: underline;
  text-underline-offset: 3px;
}

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

.content-with-image {
  display: flex;
  flex-direction: row;
  gap: 2rem;
  align-items: flex-start;
  margin-bottom: 2rem;
}

.content-with-image .text-col {
  flex: 1 1 65%;
}

.content-with-image .img-col {
  flex: 0 0 280px;
  text-align: center;
}

.content-with-image .img-col img {
  width: 100%;
  max-width: 280px;
  height: auto;
  border-radius: 6px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

.research-topic {
  background-color: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 8px;
  padding: 1.5rem;
  margin-bottom: 1.5rem;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04);
}

.research-topic h3 {
  margin-top: 0;
  color: #1e40af;
}

@media (prefers-color-scheme: dark) {
  .research-topic h3 {
    color: #60a5fa;
  }
}

figure {
  margin: 1.75rem 0;
  text-align: center;
}

figure img {
  max-width: 100%;
  height: auto;
  border-radius: 6px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

figcaption {
  margin-top: 0.6rem;
  font-size: 0.92rem;
  color: var(--text-muted);
  line-height: 1.45;
}

hr {
  border: 0;
  height: 1px;
  background-color: var(--border-color);
  margin: 2rem 0;
}

.site-footer {
  margin-top: 4rem;
  padding: 2.25rem 1.25rem;
  border-top: 1px solid var(--border-color);
  text-align: center;
  font-size: 0.88rem;
  color: var(--text-muted);
}

.site-footer p {
  margin-bottom: 0.4rem;
}

@media (max-width: 768px) {
  .content-with-image {
    flex-direction: column-reverse;
  }

  .content-with-image .img-col {
    margin: 0 auto 1.5rem auto;
  }

  .site-header h1 {
    font-size: 1.6rem;
  }

  .site-nav {
    flex-direction: column;
    align-items: center;
    gap: 0.25rem;
  }
}