:root {
  --bg: #f7f7f5;
  --surface: #ffffff;
  --text: #1c1c1c;
  --muted: #6b6b6b;
  --border: #e6e6e6;
  --accent: #3a6f6a;
}

* {
  box-sizing: border-box;
}

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

a {
  color: inherit;
  text-decoration: none;
}

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

figure {
    margin: unset;
}

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 120px;
}

.about-page {
    max-width: 720px;
    margin: 80px auto;
}

/* NAV */
.nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 72px;
  border-bottom: 1px solid var(--border);
}

.nav-links a {
  margin-left: 24px;
  color: var(--muted);
}

/* HERO */
.hero {
  padding: 80px 0 60px;
}

.hero h1 {
  font-size: 48px;
  margin: 0;
}

.hero p {
  color: var(--muted);
  margin: 12px 0 24px;
}

.btn {
  display: inline-block;
  padding: 10px 16px;
  border-radius: 8px;
  border: 1px solid var(--border);
  margin-right: 12px;
}

.btn.primary {
  background: var(--accent);
  color: white;
  border: none;
}

/* GRID */
.grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

/* CARDS */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 24px;
}

.card h3 {
  margin: 0 0 8px;
}

.meta {
  font-size: 13px;
  color: var(--muted);
}

.link {
    text-decoration: underline;
}

.has-external-badge::before {
    content:"External \2197";
    font-size:12px;
    padding:4px 8px;
    border-radius:999px;
    background:#e6f0ef;
    color:#3a6f6a;
}

/* TAGS */
.tags span {
  display: inline-block;
  font-size: 12px;
  padding: 4px 10px;
  margin-right: 6px;
  border-radius: 999px;
  background: #eee;
}

/* FILTER BAR */
.filters {
  display: flex;
  gap: 10px;
  margin: 40px 0 20px;
}

.filter {
  padding: 6px 12px;
  border-radius: 999px;
  border: 1px solid var(--border);
  font-size: 14px;
}

.filter.active {
  background: var(--accent);
  color: white;
  border: none;
}

/* ARTICLE */
.article {
  max-width: 720px;
  margin: 60px auto;
}

.article h1, .article .heading {
  font-size: 40px;
}

.callout {
  border-left: 4px solid var(--accent);
  padding: 12px 16px;
  background: #fff;
  margin: 20px 0;
}

.article .author-card {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}
.article .author-card .author-image {
    margin-top: 2rem;
    border: 1px solid grey;
    width: 120px;
    height: 120px;
    border-radius: 50%;
}

.article .author-card .bio {
    flex-basis: 50%;
    border-right: 2px solid;
    border-image: linear-gradient(to bottom, #ffffff00 0%, #ffffff00 10%, #c7c7c7 10%, #c7c7c7 90%, #ffffff00 90%) 1;
}

/* IMAGE */
.side-by-side {
    display: flex;
    gap: 5%;
}
.image {
    display: block;
    overflow: hidden;
}
.image.tiny {
    width: 40px;
    max-height: 80px;
}
.image.medium {
    width: 30%;
    min-width: 240px;
}
.image .caption {
    font-style: italic;
}

.image.circular-logo {
    border-radius: 50%;
    border: 1px solid lightgrey;
    width: 40px;
    height: 40px;
    background: white;
    display: flex;
    align-items: center;
}

/* FOOTER */
.footer {
  padding: 40px 0;
  color: var(--muted);
  border-top: 1px solid var(--border);
  margin-top: 60px;
}
.footer .copyright {
    text-align: center;
}

/* RESPONSIVE */
@media screen and (max-width: 640px) {
    .side-by-side {
        flex-wrap: wrap;
    }

    .about-page {
        margin: auto;
    }

    .container {
        padding: 0 2rem;
    }
}