:root {
  --paper: #fbf8f1;
  --grid: rgba(31, 77, 58, 0.055);
  --ink: #173d2f;
  --ink-soft: #3b5d4f;
  --rule: #cfd9cf;
  --amber: #c98a1b;
  --amber-soft: #f3e2bd;
  --tab-industry: #c98a1b;
  --tab-environment: #2f7f7a;
  --tab-plants: #4f8a2e;
  --tab-medicine: #8a4a6b;
  --tab-methods: #3f5f96;
  --tab-reading: #6b5a3a;
  --sans: "Avenir Next", "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  --serif: Charter, "Bitstream Charter", Georgia, serif;
  --measure: 42rem;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background-color: var(--paper);
  background-image:
    linear-gradient(var(--grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 22px 22px;
  color: var(--ink);
  font-family: var(--serif);
  font-size: 1.075rem;
  line-height: 1.68;
  overflow-wrap: break-word;
}

img { max-width: 100%; height: auto; display: block; }

a {
  color: var(--ink);
  text-decoration: underline;
  text-decoration-color: var(--amber);
  text-decoration-thickness: 2px;
  text-underline-offset: 3px;
}
a:hover, a:focus { background: var(--amber-soft); }

.skip {
  position: absolute; left: -999px; top: 0;
  background: var(--ink); color: var(--paper); padding: .5rem .8rem;
}
.skip:focus { left: .5rem; top: .5rem; }

.masthead {
  border-bottom: 3px double var(--ink);
  background: rgba(251, 248, 241, 0.94);
}
.masthead-inner {
  max-width: 68rem; margin: 0 auto; padding: 1rem 1rem .6rem;
  display: flex; flex-wrap: wrap; align-items: center; gap: .6rem 1.5rem;
  justify-content: space-between;
}
.brand {
  display: flex; align-items: center; gap: .7rem;
  text-decoration: none; min-width: 0;
}
.brand:hover, .brand:focus { background: none; }
.brand svg { flex: 0 0 auto; }
.brand-name {
  font-family: var(--sans); font-weight: 700; font-size: 1.45rem;
  letter-spacing: .01em; line-height: 1.1; color: var(--ink);
}
.brand-line {
  display: block; font-family: var(--serif); font-style: italic;
  font-weight: 400; font-size: .86rem; color: var(--ink-soft); letter-spacing: 0;
}

.nav-wide ul, .nav-narrow ul { list-style: none; margin: 0; padding: 0; }
.nav-wide ul {
  display: flex; flex-wrap: wrap; gap: .25rem .35rem; justify-content: flex-end;
}
.nav-wide a, .nav-narrow a {
  font-family: var(--sans); font-size: .9rem; font-weight: 600;
  text-decoration: none; display: inline-block;
  padding: .25rem .55rem; border: 1px solid transparent; border-radius: 3px;
}
.nav-wide a:hover, .nav-wide a:focus { border-color: var(--amber); background: var(--amber-soft); }
.nav-narrow { display: none; width: 100%; }
.nav-narrow summary {
  font-family: var(--sans); font-weight: 700; font-size: .95rem; cursor: pointer;
  padding: .4rem .7rem; border: 1px solid var(--ink); border-radius: 3px;
  display: inline-block; list-style: none;
}
.nav-narrow summary::-webkit-details-marker { display: none; }
.nav-narrow summary::before { content: "\2630\00a0\00a0"; }
.nav-narrow ul { margin-top: .5rem; border-top: 1px solid var(--rule); }
.nav-narrow li { border-bottom: 1px solid var(--rule); }
.nav-narrow a { display: block; padding: .55rem .2rem; }

@media (max-width: 760px) {
  .nav-wide { display: none; }
  .nav-narrow { display: block; }
}

main { max-width: 68rem; margin: 0 auto; padding: 1.5rem 1rem 2.5rem; }

.page {
  max-width: var(--measure); margin: 0 auto;
}
.page.wide { max-width: 60rem; }

.tab {
  display: inline-block; font-family: var(--sans); font-size: .75rem;
  font-weight: 700; letter-spacing: .08em; text-transform: uppercase;
  color: #fff; background: var(--tab-color, var(--ink));
  padding: .2rem .7rem .2rem .6rem; border-radius: 0 4px 4px 0;
  border-left: 5px solid rgba(0,0,0,.25);
}
.tab-industry { --tab-color: var(--tab-industry); }
.tab-environment { --tab-color: var(--tab-environment); }
.tab-plants { --tab-color: var(--tab-plants); }
.tab-medicine { --tab-color: var(--tab-medicine); }
.tab-methods { --tab-color: var(--tab-methods); }
.tab-reading { --tab-color: var(--tab-reading); }

h1, h2, h3 { font-family: var(--sans); line-height: 1.22; color: var(--ink); }
h1 { font-size: clamp(1.7rem, 4.6vw, 2.45rem); margin: .6rem 0 .8rem; letter-spacing: -.01em; }
h2 { font-size: 1.32rem; margin: 2.1rem 0 .6rem; padding-bottom: .25rem; border-bottom: 1px solid var(--rule); }
h3 { font-size: 1.08rem; margin: 1.5rem 0 .4rem; }

.lede { font-size: 1.18rem; color: var(--ink-soft); margin-top: 0; }

p { margin: 0 0 1.05rem; }

figure { margin: 1.6rem 0; }
figure img { border: 1px solid var(--rule); border-radius: 2px; background: #fff; padding: 5px; }
figcaption {
  font-family: var(--sans); font-size: .84rem; color: var(--ink-soft);
  margin-top: .45rem; padding-left: .7rem; border-left: 3px solid var(--amber);
}
figure.diagram svg { width: 100%; height: auto; background: #fff; border: 1px solid var(--rule); border-radius: 2px; }

.divider { display: flex; justify-content: center; margin: 2rem 0 1.6rem; }
.divider svg { width: 46px; height: 46px; }

.note {
  border: 1px dashed var(--ink-soft); background: rgba(255,255,255,.7);
  padding: .9rem 1rem; margin: 1.5rem 0; font-size: .98rem;
}
.note strong { font-family: var(--sans); }

.related {
  margin-top: 2rem; padding: 1rem 1.1rem; background: rgba(243,226,189,.45);
  border-left: 4px solid var(--amber);
}
.related h2 { margin-top: 0; border: 0; font-size: 1.05rem; }
.related p { margin: 0; }

.notice-body {
  border: 1px solid var(--ink); background: #fff; padding: 1rem 1.1rem;
  font-size: .98rem; margin: 1.6rem 0;
}

dl.glossary { margin: 1rem 0 0; }
dl.glossary dt {
  font-family: var(--sans); font-weight: 700; margin-top: 1.1rem;
  color: var(--ink);
}
dl.glossary dd { margin: .2rem 0 0; padding-left: 1rem; border-left: 2px solid var(--rule); }

.hub { display: grid; grid-template-columns: repeat(auto-fit, minmax(16rem, 1fr)); gap: 1rem; margin: 1.2rem 0; }
.hub section {
  background: rgba(255,255,255,.78); border: 1px solid var(--rule);
  border-top: 5px solid var(--tab-color, var(--ink)); padding: .8rem 1rem 1rem;
}
.hub h3 { margin: .2rem 0 .5rem; font-size: 1rem; }
.hub ul { margin: 0; padding-left: 1.1rem; }
.hub li { margin: .35rem 0; line-height: 1.45; }

.topic-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(17rem, 1fr)); gap: 1.1rem; margin-top: 1rem; }
.topic-group {
  background: rgba(255,255,255,.82); border: 1px solid var(--rule);
  padding: 0 1rem 1rem; position: relative;
}
.topic-group .tab { margin: 0 0 .6rem -1rem; }
.topic-group h3 { margin-top: .3rem; }
.topic-group p { font-size: .97rem; line-height: 1.55; margin: .55rem 0; }

.sitefoot {
  border-top: 3px double var(--ink); margin-top: 2rem;
  background: rgba(251, 248, 241, 0.96);
}
.sitefoot-inner { max-width: 68rem; margin: 0 auto; padding: 1.5rem 1rem 2rem; }
.foot-index { display: grid; grid-template-columns: repeat(auto-fit, minmax(12rem, 1fr)); gap: .6rem 1.5rem; }
.foot-index h2 {
  font-size: .78rem; text-transform: uppercase; letter-spacing: .09em; border: 0;
  margin: .4rem 0 .3rem; color: var(--ink-soft);
}
.foot-index ul { list-style: none; margin: 0; padding: 0; }
.foot-index li { margin: .2rem 0; font-family: var(--sans); font-size: .85rem; line-height: 1.4; }
.foot-index a { text-decoration-thickness: 1px; }
.notice {
  margin-top: 1.4rem; padding-top: 1rem; border-top: 1px solid var(--rule);
  font-size: .88rem; color: var(--ink-soft); line-height: 1.55;
}

@media print {
  body { background: #fff; }
  .nav-wide, .nav-narrow { display: none; }
}