:root {
  --bg: #fbfaf8;
  --panel: #ffffff;
  --ink: #1d1c1a;
  --muted: #6b6862;
  --line: #e7e3dc;
  --brand: #b5502a;
  --brand-2: #2f6f6a;
  --accent: #f2ede5;
  --shadow: 0 1px 2px rgba(0,0,0,.05), 0 6px 20px rgba(0,0,0,.05);
  --sidebar-w: 240px;
}

* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
}

body {
  background: var(--bg);
  color: var(--ink);
  font: 16px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

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

a:hover {
  text-decoration: underline;
}

.layout {
  display: grid;
  grid-template-columns: var(--sidebar-w) 1fr;
  min-height: 100vh;
}

.sidebar {
  background: #211f1d;
  color: #e9e5de;
  padding: 22px 16px;
  position: sticky;
  top: 0;
  align-self: start;
  height: 100vh;
  display: flex;
  flex-direction: column;
}
.sidebar .logo {
  font-weight: 800;
  font-size: 20px;
  color: #fff;
  letter-spacing: -0.02em;
  display: block;
  margin-bottom: 22px;
}
.sidebar .logo span {
  color: var(--brand);
}
.sidebar ul {
  list-style: none;
  margin: 0;
  padding: 0;
  flex: 1;
}
.sidebar li a {
  display: block;
  padding: 8px 12px;
  border-radius: 8px;
  color: #cfcabf;
  font-size: 14.5px;
}
.sidebar li a:hover {
  background: #322f2b;
  color: #fff;
  text-decoration: none;
}
.sidebar .sidebar-foot {
  margin-top: 18px;
  padding-top: 14px;
  border-top: 1px solid #3a3733;
  display: flex;
  flex-direction: column;
  gap: 3px;
  font-size: 11.5px;
  color: #8c887f;
}

.nav-toggle {
  position: absolute;
  left: -9999px;
}

.nav-toggle-label {
  display: none;
}

.main {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 30;
  background: rgba(251, 250, 248, 0.85);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
  padding: 12px 28px;
}

.searchbox {
  position: relative;
  max-width: 640px;
}

.search-input {
  width: 100%;
  padding: 11px 16px;
  font-size: 15px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--panel);
  box-shadow: var(--shadow);
  outline: none;
}

.search-input:focus {
  border-color: var(--brand);
  box-shadow: 0 0 0 3px rgba(181, 80, 42, 0.12);
}

.search-panel {
  display: none;
  position: absolute;
  top: 50px;
  left: 0;
  right: 0;
  z-index: 40;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 12px;
  box-shadow: var(--shadow);
  max-height: 70vh;
  overflow: auto;
}

.search-panel.show {
  display: block;
}

.sr-empty {
  padding: 16px;
  color: var(--muted);
}

.sr-list {
  list-style: none;
  margin: 0;
  padding: 6px;
}

.sr-list li a {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 4px 10px;
  align-items: baseline;
  padding: 9px 12px;
  border-radius: 8px;
  color: var(--ink);
}

.sr-list li a:hover {
  background: var(--accent);
  text-decoration: none;
}

.sr-title {
  font-weight: 600;
}

.sr-snip {
  grid-column: 2;
  color: var(--muted);
  font-size: 13px;
}

.sr-snip b {
  color: var(--ink);
  background: #ffe9bf;
}

.sr-tag, .tag {
  font-size: 10.5px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: #fff;
  background: var(--brand-2);
  padding: 2px 7px;
  border-radius: 999px;
  align-self: center;
  white-space: nowrap;
}

.content {
  padding: 32px 28px 80px;
  max-width: 920px;
}

.home h1 {
  font-size: 30px;
  letter-spacing: -0.02em;
  margin: 0 0 8px;
}

.lede {
  color: var(--muted);
  font-size: 17px;
  max-width: 60ch;
}

.muted {
  color: var(--muted);
}

.error {
  color: #b3261e;
}

.grid {
  margin-top: 22px;
  display: grid;
  gap: 14px;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
}

.tile {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 16px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 12px;
  box-shadow: var(--shadow);
  color: var(--ink);
}

.tile:hover {
  border-color: var(--brand);
  text-decoration: none;
  transform: translateY(-1px);
}

.tile-title {
  font-weight: 700;
}

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

.cardlist {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.cardrow a {
  display: block;
  padding: 14px 16px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 10px;
  color: var(--ink);
}

.cardrow a:hover {
  border-color: var(--brand);
  text-decoration: none;
}

.cardrow-title {
  display: block;
  font-weight: 650;
}

.cardrow-sum {
  display: block;
  color: var(--muted);
  font-size: 13.5px;
  margin-top: 3px;
}

.cardrow-sum b {
  background: #ffe9bf;
}

.crumbs {
  color: var(--muted);
  font-size: 13px;
  margin-bottom: 14px;
}

.article-body {
  font-size: 16.5px;
}

.article-body h1 {
  font-size: 28px;
  letter-spacing: -0.02em;
  margin: 0 0 14px;
}

.article-body h2 {
  font-size: 21px;
  margin: 28px 0 10px;
}

.article-body h3, .article-body h4 {
  margin: 22px 0 8px;
}

.article-body p {
  margin: 12px 0;
}

.article-body img {
  max-width: 100%;
  height: auto;
  border-radius: 8px;
  border: 1px solid var(--line);
}

.article-body table {
  border-collapse: collapse;
  width: 100%;
  margin: 16px 0;
  font-size: 14.5px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  overflow: hidden;
}

.article-body th, .article-body td {
  border: 1px solid var(--line);
  padding: 7px 10px;
  text-align: left;
}

.article-body th {
  background: var(--accent);
  font-weight: 650;
}

.article-body ul, .article-body ol {
  margin: 12px 0;
  padding-left: 22px;
}

.related {
  margin-top: 30px;
  padding: 16px 18px;
  background: var(--accent);
  border-radius: 12px;
}
.related h3 {
  margin: 0 0 8px;
  font-size: 14px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--muted);
}
.related ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.related li a {
  display: inline-block;
  padding: 5px 11px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: 13px;
}

.chem {
  margin: 4px 0 24px;
  padding: 16px 18px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-left: 3px solid var(--brand-2);
  border-radius: 12px;
  box-shadow: var(--shadow);
}
.chem h3 {
  margin: 0 0 10px;
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--brand-2);
}

.chem-formula {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  color: var(--ink);
  margin: 0 0 10px;
}

.chem-table {
  border-collapse: collapse;
  width: 100%;
  font-size: 14px;
  margin: 0;
}
.chem-table th, .chem-table td {
  border-bottom: 1px solid var(--line);
  padding: 5px 10px;
  text-align: right;
}
.chem-table th {
  color: var(--muted);
  font-weight: 600;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}
.chem-table td.ox {
  text-align: left;
  font-weight: 600;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
}
.chem-table td.tol {
  color: var(--muted);
}
.chem-table tbody tr:last-child td {
  border-bottom: none;
}

.chem-table.props td {
  text-align: left;
}

.chem-table.props td.pv {
  color: var(--ink);
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 13px;
}

.stull-fig {
  margin: 14px 0 6px;
}

.stull {
  display: block;
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 8px;
  max-width: 100%;
}

.stull .ax {
  fill: var(--muted);
  font-size: 10px;
}

.stull .tick {
  fill: var(--muted);
  font-size: 9px;
}

.stull .zone {
  fill: #b8b1a6;
  font-size: 10px;
  font-style: italic;
}

.stull-cap {
  margin: 6px 0 0;
  color: var(--muted);
  font-size: 12px;
}

.chem-meta {
  margin: 10px 0 2px;
  color: var(--muted);
  font-size: 12.5px;
}

.chem-src {
  margin: 2px 0 0;
  color: var(--muted);
  font-size: 11.5px;
}

.provenance {
  margin-top: 28px;
  padding-top: 14px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 12.5px;
}

.notfound {
  padding: 24px 0;
}

.searchpage h1 {
  margin-bottom: 4px;
}

@media (max-width: 720px) {
  .layout {
    display: block;
  }
  .sidebar {
    position: static;
    height: auto;
    flex-direction: row;
    flex-wrap: wrap;
    align-items: center;
    gap: 8px;
    padding: 10px 16px;
  }
  .sidebar .logo {
    margin-bottom: 0;
    margin-right: auto;
  }
  .sidebar ul {
    display: none;
    flex: none;
    flex-basis: 100%;
    flex-direction: column;
    gap: 2px;
    margin-top: 8px;
  }
  .sidebar li a {
    padding: 11px 12px;
  }
  .nav-toggle-label {
    display: block;
    cursor: pointer;
    user-select: none;
    color: #e9e5de;
    font-size: 22px;
    line-height: 1;
    padding: 2px 10px;
    border-radius: 8px;
  }
  .nav-toggle-label:active {
    background: #322f2b;
  }
  .nav-toggle:checked ~ ul {
    display: flex;
  }
  .topbar {
    padding: 10px 16px;
  }
  .content {
    padding: 22px 16px 64px;
  }
}

/* static-site search box (Pagefind) */
.pf-search { max-width: 640px; }
.pf-search .pagefind-ui__search-input { border-radius: 10px; }