:root {
  --bg: #ffffff;
  --surface: #ffffff;
  --surface-soft: #f7f8fa;
  --ink: #222222;
  --muted: #666666;
  --line: #dddddd;
  --accent: #225c9c;
  --accent-deep: #163f69;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: Georgia, "Times New Roman", serif;
  line-height: 1.7;
}

a {
  color: var(--accent);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.site-shell {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
  padding: 0 0 48px;
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
}

.brand {
  color: var(--ink);
  text-decoration: none;
}

.brand-title {
  display: block;
  font-size: 1.2rem;
  font-weight: 700;
}

.brand-subtitle {
  display: block;
  margin-top: 2px;
  color: var(--muted);
  font-size: 0.88rem;
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
}

.site-nav a {
  color: var(--accent);
  font-size: 0.96rem;
}

.site-nav a.is-active {
  color: var(--accent-deep);
  font-weight: 700;
}

.site-main {
  padding-top: 26px;
}

.main-grid {
  display: grid;
  grid-template-columns: 280px minmax(0, 1fr);
  gap: 36px;
  align-items: start;
}

.sidebar-card {
  position: sticky;
  top: 24px;
}

.profile-mark {
  display: grid;
  place-items: center;
  width: 108px;
  height: 108px;
  margin-bottom: 18px;
  border: 1px solid var(--line);
  background: var(--surface-soft);
  color: var(--accent-deep);
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: 0.08em;
}

.profile-photo {
  display: block;
  width: 108px;
  height: 108px;
  margin-bottom: 18px;
  border: 1px solid var(--line);
  object-fit: cover;
}

.sidebar-name {
  margin: 0 0 6px;
  font-size: 1.5rem;
}

.sidebar-name-sub {
  margin: -2px 0 12px;
  color: var(--muted);
  font-size: 0.88rem;
  line-height: 1.35;
}

.sidebar-role,
.sidebar-bio {
  margin: 0 0 12px;
  color: var(--muted);
  font-size: 0.98rem;
}

.sidebar-list {
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
}

.sidebar-list li {
  margin: 0 0 10px;
  color: var(--ink);
  font-size: 0.96rem;
}

.content-column {
  min-width: 0;
}

.page-header {
  margin-bottom: 22px;
}

h1,
h2,
h3 {
  color: var(--ink);
  font-family: Georgia, "Times New Roman", serif;
}

h1 {
  margin: 0 0 10px;
  font-size: 2rem;
  line-height: 1.2;
}

h2 {
  margin: 0 0 10px;
  font-size: 1.35rem;
}

h3 {
  font-size: 1.1rem;
}

.lead,
.tagline {
  margin: 0 0 8px;
  color: var(--muted);
  font-size: 1rem;
}

.content-block,
.toc {
  margin-bottom: 26px;
  padding: 0;
}

.prose h2,
.prose h3 {
  margin-top: 1.8rem;
}

.prose p,
.prose li {
  color: var(--ink);
}

.prose ul,
.prose ol,
.content-block ul {
  padding-left: 1.3rem;
}

.prose code {
  padding: 0.08rem 0.28rem;
  border: 1px solid var(--line);
  background: var(--surface-soft);
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: 0.92em;
}

.toc {
  border-left: 3px solid var(--line);
  padding-left: 14px;
}

.toc h2 {
  font-size: 1rem;
  margin-bottom: 8px;
}

.toc ul {
  margin: 0;
  padding-left: 1.1rem;
}

.site-footer {
  margin-top: 28px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.9rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  margin-bottom: 10px;
}

.footer-grid p,
.site-footer p {
  margin: 0 0 8px;
}

.mini-label {
  color: var(--muted);
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

@media (max-width: 900px) {
  .main-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .sidebar-card {
    position: static;
  }

  .footer-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .site-header {
    flex-direction: column;
    align-items: flex-start;
  }

  .site-nav {
    gap: 12px;
  }

  h1 {
    font-size: 1.7rem;
  }
}