:root {
  --accent: #0f5fa8;
  --bg: #f7f8fa;
  --line: #d8dee6;
  --muted: #5f6b7a;
  --paper: #ffffff;
  --text: #1f2933;
}

* {
  box-sizing: border-box;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: Georgia, "Times New Roman", "SimSun", serif;
  font-size: 17px;
  line-height: 1.6;
  margin: 0;
}

a {
  color: var(--accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

a:hover {
  color: #083f73;
}

.site-shell {
  background: var(--paper);
  margin: 0 auto;
  max-width: 980px;
  min-height: 100vh;
  padding: 30px 34px 56px;
}

.site-header {
  align-items: baseline;
  border-bottom: 1px solid var(--line);
  display: flex;
  gap: 24px;
  justify-content: space-between;
  margin-bottom: 42px;
  padding-bottom: 18px;
}

.site-title {
  color: var(--text);
  font-size: 1.12rem;
  font-weight: 700;
  text-decoration: none;
  white-space: nowrap;
}

.site-title span {
  color: var(--muted);
  font-weight: 400;
  margin-left: 5px;
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  justify-content: flex-end;
}

.site-nav a {
  border-bottom: 2px solid transparent;
  color: var(--muted);
  font-size: 0.95rem;
  padding-bottom: 3px;
  text-decoration: none;
}

.site-nav a:hover,
.site-nav a[aria-current="page"] {
  border-color: var(--accent);
  color: var(--accent);
}

.home-layout {
  align-items: start;
  display: grid;
  gap: 48px;
  grid-template-columns: minmax(0, 1fr) 250px;
}

.eyebrow {
  color: var(--accent);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0;
  margin: 0 0 10px;
  text-transform: uppercase;
}

h1,
h2,
h3 {
  color: #18212c;
  line-height: 1.25;
}

h1 {
  font-size: 2.15rem;
  margin: 0 0 18px;
}

h2 {
  font-size: 1.35rem;
  margin: 0 0 16px;
}

h3 {
  font-size: 1.08rem;
  margin: 18px 0 8px;
}

p {
  margin: 0 0 16px;
}

.lead {
  color: #2f3a47;
  font-size: 1.08rem;
}

.quick-links {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  margin-top: 24px;
}

.portrait {
  margin: 0;
}

.portrait img {
  border: 1px solid var(--line);
  border-radius: 6px;
  box-shadow: 0 12px 28px rgba(31, 41, 51, 0.12);
  display: block;
  height: 310px;
  object-fit: cover;
  width: 250px;
}

.content {
  margin: 0 auto;
  max-width: 760px;
}

.content h1 {
  border-bottom: 1px solid var(--line);
  margin-bottom: 28px;
  padding-bottom: 14px;
}

.section-block {
  margin-top: 30px;
}

.section-block + .section-block {
  border-top: 1px solid var(--line);
  padding-top: 28px;
}

.paper-list,
.course-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.paper-list li,
.course-list li {
  margin-bottom: 18px;
  padding-left: 20px;
  position: relative;
}

.paper-list li::before,
.course-list li::before {
  background: var(--accent);
  content: "";
  height: 6px;
  left: 0;
  position: absolute;
  top: 0.68em;
  width: 6px;
}

.paper-title,
.course-title {
  font-weight: 700;
}

.paper-meta,
.course-meta {
  color: var(--muted);
}

.link-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.link-list li {
  margin-bottom: 10px;
}

@media (max-width: 760px) {
  body {
    font-size: 16px;
  }

  .site-shell {
    padding: 22px 20px 42px;
  }

  .site-header {
    display: block;
    margin-bottom: 32px;
  }

  .site-nav {
    justify-content: flex-start;
    margin-top: 14px;
  }

  .home-layout {
    display: block;
  }

  h1 {
    font-size: 1.82rem;
  }

  .portrait {
    margin-top: 28px;
  }

  .portrait img {
    height: auto;
    max-width: 250px;
    width: 100%;
  }
}