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

body {
  font-family: Arial, sans-serif;
  background: linear-gradient(rgba(0,0,0,0.4), rgba(0,0,0,0.4)),
              url('assets/images/NIH_Clinical_Research_Center_aerial.jpg') no-repeat center center fixed;
  background-size: cover;
  color: #333;
}

.container {
  width: 90%;
  max-width: 960px;
  margin: 2em auto;
  background-color: rgba(255,255,255,0.85);
  padding: 2em;
  border-radius: 8px;
}

.hero {
  position: relative;
  text-align: center;
  padding: 4em 0;
}
.hero .overlay {
  position: absolute;
  top: 0; right: 0; bottom: 0; left: 0;
  background-color: rgba(0, 0, 0, 0.5);
}
.hero-container {
  position: relative;
  z-index: 1;
  background: none;
  padding: 0;
}
.hero h1,
.hero .title,
.hero .affiliation,
.hero .contact a,
.hero .social-links a {
  color: #fff;
}

h1, h2, h3 {
  color: #0056b3;
  font-weight: bold;
}

.social-links a,
.contact a {
  color: #0056b3;
  text-decoration: none;
  margin: 0 0.5em;
}
.social-links a:hover,
.contact a:hover {
  text-decoration: underline;
}

section#projects .project {
  margin: 2em 0;
}

section#metrics table {
  margin: 0 auto 2em;
  width: 60%;
  border-collapse: collapse;
}
section#metrics th,
section#metrics td {
  border: 1px solid #ddd;
  padding: 8px;
  text-align: center;
}

.histogram img {
  display: block;
  margin: 1em auto;
  max-width: 100%;
  height: auto;
}

.pub-list {
  list-style: none;
  padding-left: 0;
  margin-bottom: 2em;
}
.pub-list li {
  margin-bottom: 0.8em;
}
.pub-list a {
  color: #0056b3;
  text-decoration: none;
}

section#global-interaction table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 2em;
}
section#global-interaction th,
section#global-interaction td {
  border: 1px solid #ddd;
  padding: 8px;
  text-align: left;
}

.spaced {
  margin-top: 1.5em;
}

footer {
  text-align: center;
  margin: 2em 0;
  color: #666;
  font-size: 0.9em;
}

@media (max-width: 600px) {
  .container {
    margin: 1em;
    padding: 1em;
  }
  section#metrics table {
    width: 100%;
  }
  section#global-interaction table,
  section#metrics table {
    display: block;
    overflow-x: auto;
  }
}

/* Reduce profile photo size */
.profile-photo {
  width: 120px;
  height: auto;
  border-radius: 50%;
  margin-bottom: 1em;
}

/* Add spacing around section headings */
h2 {
  margin: 2em 0 1em;
}

/* Spacing for View all link before next section */
.view-all {
  margin: 2em 0;
}

/* 3. Space out each project entry */
section#projects .project {
  margin: 1.5em 0;
}

/* 5. Space between Awards → Skills, and Skills → Membership */
section#awards + section#skills,
section#skills + section#membership {
  margin-top: 2em;
}