:root {
  --bg: #f8f8f6;
  --ink: #171b24;
  --muted: #5f6675;
  --line: #d7dbe3;
  --accent: #124a8c;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
}

body {
  background: var(--bg);
  color: var(--ink);
  font-family: "Avenir Next", "Segoe UI", "Helvetica Neue", sans-serif;
}

.home-shell {
  min-height: 100vh;
  padding: 52px 20px 72px;
}

.home-topbar,
.home-content,
.site-header-inner,
.home-nav-inner {
  width: min(860px, 100%);
  margin: 0 auto;
}

.home-topbar {
  display: grid;
  gap: 20px;
  margin-bottom: 24px;
}

.site-header-inner {
  display: grid;
  gap: 8px;
}

.home-title {
  margin: 0;
  font-family: "Iowan Old Style", "Palatino Linotype", Palatino, serif;
  font-size: clamp(2.2rem, 5vw, 3rem);
  line-height: 1;
  letter-spacing: 0.01em;
}

.home-subtitle {
  margin: 0;
  color: var(--muted);
  font-size: 1rem;
  max-width: 68ch;
  line-height: 1.45;
}

.home-nav-inner {
  border-bottom: 1px solid var(--line);
  padding-bottom: 12px;
}

.home-selector {
  display: flex;
  gap: 24px;
  align-items: center;
}

.home-tab {
  border: 0;
  background: transparent;
  color: var(--muted);
  padding: 2px 0;
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  cursor: pointer;
  border-bottom: 2px solid transparent;
}

.home-tab:hover {
  color: var(--ink);
}

.home-tab.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

.home-content {
  display: grid;
}

.home-panel {
  padding: 0;
}

.about-content {
  display: grid;
  gap: 14px;
  line-height: 1.72;
  max-width: 78ch;
}

.about-content h2 {
  margin: 0 0 2px;
  font-family: "Iowan Old Style", "Palatino Linotype", Palatino, serif;
  font-size: 1.45rem;
}

.about-content p {
  margin: 0;
}

.about-content code {
  background: #f0f3f8;
  border-radius: 5px;
  padding: 1px 6px;
}

.about-content math {
  font-family:
    "STIX Two Math",
    "Cambria Math",
    "STIXGeneral",
    "Latin Modern Math",
    serif;
  font-size: 1.08em;
}

.about-content math[display="block"] {
  margin: 2px 0 4px;
}

.app-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
}

.app-item {
  display: grid;
  gap: 8px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
}

.app-item:first-child {
  border-top: 1px solid var(--line);
}

.app-name {
  margin: 0;
  font-family: "Iowan Old Style", "Palatino Linotype", Palatino, serif;
  font-size: 1.28rem;
}

.app-summary {
  margin: 0;
  color: var(--muted);
  font-size: 0.98rem;
  max-width: 72ch;
}

.app-links {
  display: flex;
  gap: 10px;
}

.app-link {
  color: var(--accent);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 600;
}

.app-link:hover {
  text-decoration: underline;
}

@media (max-width: 720px) {
  .home-shell {
    padding: 32px 14px 44px;
  }

  .home-topbar {
    gap: 16px;
    margin-bottom: 18px;
  }

  .home-subtitle {
    font-size: 0.95rem;
  }

  .home-nav-inner {
    padding-bottom: 10px;
  }

  .home-selector {
    gap: 16px;
  }

  .app-item {
    padding: 14px 0;
  }
}