/* HowSafeIsMyWater — Clinical / Environmental-Monitoring aesthetic
   IBM Plex Sans + IBM Plex Mono + IBM Plex Serif
   Deep navy + bright teal accent + cream background — EPA report visual language */

:root {
  --cream: #f4efe4;
  --cream-deep: #ece5d2;
  --cream-shadow: #ddd5bc;
  --ink: #0d1b2a;             /* deep navy */
  --ink-soft: #1d3047;
  --ink-faint: #5a6e80;
  --teal: #0fb5a8;             /* bright teal accent */
  --teal-deep: #088a80;
  --teal-soft: #d8f1ee;
  --warn: #c5391a;
  --warn-soft: #f7e0d6;
  --rule: #c4bca3;
  --rule-soft: #ddd5bc;
  --grid: rgba(13, 27, 42, 0.06);
  --paper-shadow: rgba(13, 27, 42, 0.1);
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: 'IBM Plex Sans', system-ui, sans-serif;
  background: var(--cream);
  color: var(--ink);
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  background-image:
    linear-gradient(0deg, transparent calc(100% - 1px), var(--grid) calc(100% - 1px)),
    linear-gradient(90deg, transparent calc(100% - 1px), var(--grid) calc(100% - 1px));
  background-size: 48px 48px;
}

.wrap {
  width: 100%;
  max-width: 1140px;
  margin: 0 auto;
  padding: 0 32px;
}

a { color: var(--ink); text-decoration: none; }
a:hover { color: var(--teal-deep); }

.mono { font-family: 'IBM Plex Mono', ui-monospace, monospace; }
.kicker {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.74rem;
  text-transform: uppercase;
  letter-spacing: 0.22em;
  color: var(--teal-deep);
  font-weight: 500;
  display: inline-block;
  margin-bottom: 14px;
}

/* ============ MASTHEAD ============ */
.masthead {
  background: var(--ink);
  color: var(--cream);
  border-bottom: 3px solid var(--teal);
  position: sticky;
  top: 0;
  z-index: 50;
}
.masthead .wrap {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 16px;
  padding-bottom: 16px;
}
.brand { display: flex; align-items: center; gap: 14px; }
.brand .droplet {
  width: 22px;
  height: 26px;
  color: var(--teal);
}
.brand-name {
  font-family: 'IBM Plex Sans', sans-serif;
  font-weight: 600;
  font-size: 1.04rem;
  letter-spacing: -0.005em;
  color: var(--cream);
}
.brand-dot { color: var(--teal); }
.brand-tag {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: var(--cream);
  opacity: 0.55;
  padding-left: 14px;
  border-left: 1px solid rgba(244, 239, 228, 0.2);
  margin-left: 4px;
}
.nav-desktop { display: flex; gap: 28px; align-items: center; }
.nav-desktop a {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--cream);
  opacity: 0.8;
  text-decoration: none;
}
.nav-desktop a:hover { opacity: 1; color: var(--teal); }
.nav-desktop a.nav-cta { opacity: 1; color: var(--ink); background: var(--teal); padding: 9px 16px; border-radius: 6px; letter-spacing: 0.1em; }
.nav-desktop a.nav-cta:hover { color: var(--ink); background: #fff; }

/* Mobile hamburger */
.nav-toggle { display: none; }
.nav-mobile { display: none; }

@media (max-width: 760px) {
  .nav-desktop { display: none; }
  .nav-toggle {
    display: flex; flex-direction: column; justify-content: center; gap: 5px;
    width: 46px; height: 46px; margin-right: -8px;
    background: none; border: 0; cursor: pointer; padding: 11px;
  }
  .nav-toggle span { display: block; height: 2px; width: 100%; background: var(--cream); border-radius: 2px; transition: transform .25s ease, opacity .2s ease; }
  .nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
  .nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
  .nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

  .nav-mobile { display: block; }
  .nav-mobile[hidden] { display: none; }
  .nav-mobile a {
    display: block; padding: 16px 22px;
    font-family: 'IBM Plex Sans', sans-serif; font-size: 1.05rem; font-weight: 500;
    color: var(--cream); text-decoration: none; letter-spacing: 0;
    border-top: 1px solid rgba(244,239,228,0.1);
  }
  .nav-mobile a:active { background: rgba(255,255,255,0.06); }
  .nav-mobile a.nav-mobile-cta { color: var(--ink); background: var(--teal); font-weight: 700; }
}

/* ============ HERO ============ */
.hero {
  padding: 70px 0 80px;
  border-bottom: 1px solid var(--rule);
  background:
    linear-gradient(180deg, rgba(15, 181, 168, 0.04) 0%, transparent 35%),
    var(--cream);
  position: relative;
}

.rule-line {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-top: 1px solid var(--ink);
  border-bottom: 1px solid var(--ink);
  padding: 8px 0;
  margin-bottom: 50px;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: var(--ink);
}
.rule-mark.right { text-align: right; color: var(--ink-soft); }

.hero h1 {
  font-family: 'IBM Plex Serif', Georgia, serif;
  font-size: clamp(2.4rem, 5.5vw, 4.4rem);
  line-height: 1.04;
  letter-spacing: -0.025em;
  margin: 0 0 30px;
  font-weight: 500;
  max-width: 22ch;
  color: var(--ink);
}
.hero h1 em {
  color: var(--teal-deep);
  font-style: italic;
  font-weight: 500;
}

.lede {
  font-size: 1.18rem;
  line-height: 1.55;
  max-width: 62ch;
  color: var(--ink-soft);
  margin: 0 0 40px;
}
.lede strong { color: var(--ink); font-weight: 600; }

.cta-row {
  display: flex;
  align-items: center;
  gap: 22px;
  flex-wrap: wrap;
  margin-bottom: 56px;
}
.subnote {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.75rem;
  color: var(--ink-faint);
  text-transform: uppercase;
  letter-spacing: 0.12em;
}
.btn {
  display: inline-block;
  background: var(--ink);
  color: var(--cream);
  padding: 15px 28px;
  font-family: 'IBM Plex Sans', sans-serif;
  font-weight: 500;
  font-size: 0.96rem;
  letter-spacing: 0.005em;
  border: 1px solid var(--ink);
  cursor: pointer;
  transition: all 0.14s ease;
  text-decoration: none;
}
.btn.primary {
  background: var(--teal);
  border-color: var(--teal);
  color: var(--ink);
  font-weight: 600;
}
.btn.primary:hover {
  background: var(--ink);
  border-color: var(--ink);
  color: var(--teal);
}
.btn.big { padding: 18px 32px; font-size: 1.05rem; }

.hero-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-top: 1px solid var(--ink);
  border-bottom: 1px solid var(--ink);
}
.metric {
  padding: 22px 24px;
  border-right: 1px solid var(--rule);
  background: var(--cream-deep);
}
.metric:last-child { border-right: none; }
.metric-label {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: var(--ink-faint);
  margin-bottom: 14px;
}
.metric-value {
  font-family: 'IBM Plex Serif', Georgia, serif;
  font-size: 2.4rem;
  font-weight: 500;
  color: var(--ink);
  letter-spacing: -0.02em;
  line-height: 1;
  margin-bottom: 8px;
}
.metric-value span {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.85rem;
  color: var(--ink-faint);
  margin-left: 6px;
  font-weight: 400;
  letter-spacing: 0;
}
.metric-note {
  font-size: 0.82rem;
  color: var(--ink-soft);
  line-height: 1.4;
}

/* ============ METHODOLOGY ============ */
.methodology {
  padding: 100px 0;
  background: var(--ink);
  color: var(--cream);
  border-bottom: 1px solid var(--rule);
}
.methodology .section-head { margin-bottom: 60px; max-width: 60ch; }
.methodology h2 {
  font-family: 'IBM Plex Serif', Georgia, serif;
  font-size: clamp(1.9rem, 3.5vw, 2.6rem);
  font-weight: 500;
  letter-spacing: -0.02em;
  line-height: 1.1;
  margin: 0 0 20px;
}
.methodology .section-head p {
  font-size: 1.06rem;
  color: rgba(244, 239, 228, 0.75);
  max-width: 60ch;
  margin: 0;
}
.methodology .kicker { color: var(--teal); }

.ref-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
  border-top: 1px solid rgba(244, 239, 228, 0.18);
  border-left: 1px solid rgba(244, 239, 228, 0.18);
}
.ref {
  padding: 30px 28px;
  border-right: 1px solid rgba(244, 239, 228, 0.18);
  border-bottom: 1px solid rgba(244, 239, 228, 0.18);
  background: rgba(15, 181, 168, 0.02);
}
.ref-tag {
  display: inline-block;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: var(--ink);
  background: var(--teal);
  padding: 4px 10px;
  margin-bottom: 18px;
}
.ref h3 {
  font-family: 'IBM Plex Serif', Georgia, serif;
  font-size: 1.18rem;
  font-weight: 500;
  margin: 0 0 14px;
  color: var(--cream);
  letter-spacing: -0.01em;
  line-height: 1.25;
}
.ref p {
  font-size: 0.93rem;
  color: rgba(244, 239, 228, 0.75);
  line-height: 1.55;
  margin: 0;
}
.ref .mono {
  color: var(--teal);
  font-size: 0.86rem;
}

/* ============ SAMPLE ============ */
.sample {
  padding: 100px 0;
  background: var(--cream);
  border-bottom: 1px solid var(--rule);
}
.section-head { margin-bottom: 50px; max-width: 60ch; }
.section-head h2 {
  font-family: 'IBM Plex Serif', Georgia, serif;
  font-size: clamp(1.9rem, 3.5vw, 2.6rem);
  font-weight: 500;
  letter-spacing: -0.02em;
  margin: 0 0 18px;
  line-height: 1.12;
  color: var(--ink);
}
.section-head p {
  font-size: 1.04rem;
  color: var(--ink-soft);
  max-width: 60ch;
  margin: 0;
}

.brief {
  background: var(--cream-deep);
  border: 1px solid var(--ink);
  box-shadow: 8px 8px 0 var(--paper-shadow);
}
.brief-head {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 30px;
  padding: 30px 36px;
  background: var(--ink);
  color: var(--cream);
  border-bottom: 3px solid var(--teal);
}
.brief-meta { display: flex; flex-direction: column; gap: 8px; }
.brief-line {
  display: grid;
  grid-template-columns: 110px 1fr;
  gap: 18px;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.82rem;
  letter-spacing: 0.05em;
  align-items: baseline;
}
.brief-line span:first-child {
  color: var(--teal);
  text-transform: uppercase;
  letter-spacing: 0.16em;
  font-size: 0.7rem;
}
.brief-line span:last-child {
  color: var(--cream);
}
.brief-tier {
  text-align: center;
  padding: 16px 24px;
  border: 1px solid var(--teal);
  background: rgba(15, 181, 168, 0.1);
  min-width: 170px;
}
.brief-tier.tier-hotspot {
  border-color: var(--warn);
  background: rgba(197, 57, 26, 0.15);
}
.tier-label {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: rgba(244, 239, 228, 0.7);
  margin-bottom: 8px;
}
.tier-val {
  font-family: 'IBM Plex Sans', sans-serif;
  font-size: 1.7rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--cream);
  margin-bottom: 6px;
}
.brief-tier.tier-hotspot .tier-val { color: #ffb29a; }
.tier-sub {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.74rem;
  color: rgba(244, 239, 228, 0.75);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.brief-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-bottom: 1px solid var(--rule);
}
.brief-cell {
  padding: 24px 24px;
  border-right: 1px solid var(--rule);
}
.brief-cell:last-child { border-right: none; }
.cell-label {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--ink-faint);
  margin-bottom: 12px;
}
.cell-val {
  font-family: 'IBM Plex Serif', Georgia, serif;
  font-size: 1.8rem;
  font-weight: 500;
  letter-spacing: -0.02em;
  color: var(--ink);
  line-height: 1.05;
  margin-bottom: 6px;
}
.cell-val.mono-val {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 1.05rem;
  font-weight: 600;
  letter-spacing: 0;
}
.cell-val span {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.78rem;
  color: var(--ink-faint);
  margin-left: 4px;
  font-weight: 400;
}
.cell-note {
  font-size: 0.78rem;
  color: var(--ink-soft);
  line-height: 1.4;
}

.brief-body {
  padding: 32px 36px;
}
.brief-body h4 {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.74rem;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: var(--teal-deep);
  margin: 0 0 12px;
  font-weight: 600;
}
.brief-body h4 + p { margin-top: 0; }
.brief-body p {
  font-size: 1rem;
  color: var(--ink-soft);
  line-height: 1.65;
  margin: 0 0 26px;
}
.brief-body p strong { color: var(--ink); font-weight: 600; }
.srcs {
  list-style: none;
  padding: 0;
  margin: 0;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.82rem;
  color: var(--ink-soft);
}
.srcs li {
  padding: 8px 0;
  border-top: 1px dashed var(--rule);
}
.srcs li:first-child { border-top: 0; }

.brief-foot {
  padding: 18px 36px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: var(--ink);
  color: var(--cream);
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.74rem;
  letter-spacing: 0.1em;
  opacity: 0.85;
}

/* ============ SCIENCE TABLE ============ */
.science {
  padding: 100px 0;
  background: var(--cream-deep);
  border-bottom: 1px solid var(--rule);
}
.science-two {
  display: grid;
  grid-template-columns: 1fr 1.1fr;
  gap: 70px;
  align-items: start;
}
.science h2 {
  font-family: 'IBM Plex Serif', Georgia, serif;
  font-size: clamp(1.9rem, 3.5vw, 2.6rem);
  font-weight: 500;
  letter-spacing: -0.02em;
  margin: 0 0 22px;
  line-height: 1.12;
}
.science p { color: var(--ink-soft); margin: 0; max-width: 42ch; }

.pfas-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--cream);
  border: 1px solid var(--ink);
}
.pfas-table thead th {
  background: var(--ink);
  color: var(--cream);
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  padding: 14px 20px;
  text-align: left;
  font-weight: 500;
}
.pfas-table thead th:last-child { text-align: right; }
.pfas-table tbody td {
  padding: 16px 20px;
  border-bottom: 1px solid var(--rule);
  vertical-align: top;
}
.pfas-table tbody tr:last-child td { border-bottom: none; }
.pfas-table tbody td:last-child {
  text-align: right;
  font-family: 'IBM Plex Mono', monospace;
  font-weight: 600;
  color: var(--teal-deep);
  white-space: nowrap;
}
.pfas-table td strong {
  font-family: 'IBM Plex Sans', sans-serif;
  font-weight: 600;
  color: var(--ink);
}
.pfas-table td span {
  display: block;
  margin-top: 4px;
  font-size: 0.84rem;
  color: var(--ink-faint);
}

/* ============ FILTER MATRIX ============ */
.filter-matrix {
  padding: 100px 0;
  background: var(--cream);
  border-bottom: 1px solid var(--rule);
}
.matrix-cards {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  border: 1px solid var(--ink);
}
.matrix-card {
  padding: 28px 24px;
  border-right: 1px solid var(--rule);
  background: var(--cream-deep);
  position: relative;
}
.matrix-card:last-child { border-right: none; }
.matrix-card.best {
  background: var(--ink);
  color: var(--cream);
}
.matrix-card.best .card-cert,
.matrix-card.best p { color: rgba(244, 239, 228, 0.78); }
.matrix-card.best .card-removal { color: var(--teal); }
.matrix-card.warn {
  background: var(--warn-soft);
}
.matrix-card .card-rank {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: var(--teal-deep);
  margin-bottom: 18px;
  font-weight: 600;
}
.matrix-card.best .card-rank { color: var(--teal); }
.matrix-card.warn .card-rank { color: var(--warn); }
.matrix-card h3 {
  font-family: 'IBM Plex Serif', Georgia, serif;
  font-size: 1.4rem;
  font-weight: 500;
  margin: 0 0 8px;
  letter-spacing: -0.015em;
  line-height: 1.15;
}
.card-cert {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.78rem;
  color: var(--ink-soft);
  margin-bottom: 18px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--rule);
  letter-spacing: 0.04em;
}
.matrix-card.best .card-cert { border-bottom-color: rgba(244, 239, 228, 0.18); }
.card-removal {
  font-family: 'IBM Plex Serif', Georgia, serif;
  font-size: 1.6rem;
  font-weight: 500;
  color: var(--teal-deep);
  letter-spacing: -0.015em;
  margin: 0 0 14px;
}
.card-cost {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.85rem;
  color: var(--ink-soft);
  line-height: 1.5;
  margin: 0 0 18px;
}
.matrix-card p {
  font-size: 0.9rem;
  color: var(--ink-soft);
  line-height: 1.55;
  margin: 0;
}

/* ============ ORDER ============ */
.order {
  padding: 100px 0;
  background: var(--ink);
  color: var(--cream);
  border-bottom: 1px solid var(--rule);
}
.order .kicker { color: var(--teal); }
.order-inner {
  display: grid;
  grid-template-columns: 1.05fr 1fr;
  gap: 70px;
  align-items: start;
}
.order-copy h2 {
  font-family: 'IBM Plex Serif', Georgia, serif;
  font-size: clamp(1.9rem, 3.5vw, 2.7rem);
  font-weight: 500;
  letter-spacing: -0.02em;
  line-height: 1.1;
  margin: 0 0 22px;
}
.order-copy p {
  color: rgba(244, 239, 228, 0.78);
  font-size: 1.04rem;
  line-height: 1.6;
  margin: 0 0 32px;
  max-width: 50ch;
}
.checks {
  list-style: none;
  padding: 0;
  margin: 0;
  border-top: 1px solid rgba(244, 239, 228, 0.16);
}
.checks li {
  padding: 14px 0 14px 32px;
  border-bottom: 1px solid rgba(244, 239, 228, 0.16);
  position: relative;
  font-size: 0.96rem;
  color: rgba(244, 239, 228, 0.85);
}
.checks li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 18px;
  width: 14px;
  height: 14px;
  border: 1.5px solid var(--teal);
  background: transparent;
}
.checks li::after {
  content: '';
  position: absolute;
  left: 3px;
  top: 19px;
  width: 9px;
  height: 5px;
  border-left: 2px solid var(--teal);
  border-bottom: 2px solid var(--teal);
  transform: rotate(-45deg);
}

.orderform {
  background: var(--cream);
  color: var(--ink);
  padding: 36px 32px 32px;
  border: 1px solid var(--teal);
  box-shadow: 6px 6px 0 rgba(15, 181, 168, 0.3);
}
.form-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding-bottom: 18px;
  margin-bottom: 22px;
  border-bottom: 1px solid var(--ink);
}
.form-label-big {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.76rem;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  font-weight: 600;
  color: var(--ink);
}
.form-price {
  font-family: 'IBM Plex Serif', Georgia, serif;
  font-size: 2.2rem;
  font-weight: 500;
  letter-spacing: -0.02em;
  color: var(--teal-deep);
  line-height: 1;
}
.orderform .row { margin-bottom: 16px; }
.orderform .row.two {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}
.orderform label {
  display: block;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.74rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-soft);
  font-weight: 500;
  margin-bottom: 6px;
}
.orderform .req {
  color: var(--warn);
  font-size: 0.66rem;
  margin-left: 6px;
  letter-spacing: 0.12em;
}
.orderform .opt {
  color: var(--ink-faint);
  font-size: 0.66rem;
  margin-left: 6px;
  letter-spacing: 0.12em;
  text-transform: none;
}
.orderform input[type=email],
.orderform input[type=text],
.orderform input[type=number],
.orderform select {
  display: block;
  width: 100%;
  padding: 11px 14px;
  font-family: 'IBM Plex Sans', sans-serif;
  font-size: 1rem;
  border: 1px solid var(--ink-faint);
  background: #fff;
  border-radius: 0;
  color: var(--ink);
}
.orderform input[name=zip] {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 1.7rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-align: center;
  padding: 14px 14px;
  border: 2px solid var(--ink);
}
.orderform input:focus,
.orderform select:focus {
  outline: none;
  border-color: var(--teal);
  box-shadow: 0 0 0 3px var(--teal-soft);
}

.orderform .row.check { margin-bottom: 12px; }
.checkrow {
  display: flex !important;
  gap: 12px;
  align-items: flex-start;
  font-family: 'IBM Plex Sans', sans-serif !important;
  font-size: 0.92rem !important;
  text-transform: none !important;
  letter-spacing: 0 !important;
  color: var(--ink) !important;
  font-weight: 400 !important;
  cursor: pointer;
  padding: 10px 12px;
  background: var(--cream-deep);
  border: 1px solid var(--rule-soft);
}
.checkrow input[type=checkbox] {
  margin-top: 2px;
  width: 16px;
  height: 16px;
  accent-color: var(--teal-deep);
  flex-shrink: 0;
}
.checkrow em {
  color: var(--ink-faint);
  font-style: italic;
  font-size: 0.88rem;
}

.orderform .submit {
  margin-top: 22px;
  margin-bottom: 0;
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: 10px;
}
.orderform button.btn { cursor: pointer; border: none; width: 100%; font-family: inherit; }
.orderform .subnote {
  text-align: center;
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  color: var(--ink-faint);
}
.order-status {
  margin-top: 16px;
  padding: 12px 14px;
  background: #fff;
  border: 1px solid var(--ink-faint);
  font-size: 0.92rem;
  font-family: 'IBM Plex Mono', monospace;
}
.order-status.err {
  border-color: var(--warn);
  color: var(--warn);
  background: var(--warn-soft);
}

/* ============ FOOTER ============ */
.footer {
  padding: 70px 0 32px;
  background: var(--cream-deep);
  border-top: 1px solid var(--rule);
}
.foot-top {
  display: grid;
  grid-template-columns: 1.2fr 2fr;
  gap: 60px;
  margin-bottom: 50px;
}
.foot-brand {
  font-family: 'IBM Plex Sans', sans-serif;
  font-weight: 600;
  font-size: 1.1rem;
  letter-spacing: -0.005em;
  margin-bottom: 14px;
  color: var(--ink);
}
.foot-top p {
  color: var(--ink-soft);
  font-size: 0.92rem;
  line-height: 1.55;
  margin: 0;
  max-width: 36ch;
}
.foot-cols {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
}
.foot-label {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: var(--ink-faint);
  margin-bottom: 14px;
  font-weight: 500;
}
.foot-cols span,
.foot-cols a {
  display: block;
  font-size: 0.88rem;
  color: var(--ink-soft);
  padding: 3px 0;
}
.foot-bottom {
  border-top: 1px solid var(--rule);
  padding-top: 22px;
  display: flex;
  justify-content: space-between;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.74rem;
  color: var(--ink-faint);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  flex-wrap: wrap;
  gap: 12px;
}

/* ============ RESPONSIVE ============ */
/* ============ ARTICLE / GUIDE PAGES ============ */
.subpage-hero {
  padding: 60px 0 50px;
  border-bottom: 1px solid var(--rule);
  background:
    linear-gradient(180deg, rgba(15, 181, 168, 0.04) 0%, transparent 50%),
    var(--cream);
}
.subpage-hero .rule-line { margin-bottom: 32px; }
.subpage-hero h1 {
  font-family: 'IBM Plex Serif', Georgia, serif;
  font-size: clamp(2rem, 4.2vw, 3.2rem);
  line-height: 1.08;
  letter-spacing: -0.022em;
  margin: 0 0 22px;
  font-weight: 500;
  max-width: 28ch;
  color: var(--ink);
}
.subpage-hero .lede {
  font-size: 1.12rem;
  line-height: 1.55;
  max-width: 64ch;
  color: var(--ink-soft);
  margin: 0;
}
.subpage-hero .crumbs {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.74rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--ink-faint);
  margin-bottom: 20px;
}
.subpage-hero .crumbs a { color: var(--teal-deep); }
.subpage-hero .crumbs a:hover { color: var(--ink); }
.subpage-hero .crumbs span { color: var(--rule); margin: 0 8px; }

.article {
  padding: 70px 0 90px;
  background: var(--cream);
}
.article .wrap {
  max-width: 740px;
}
.article h2 {
  font-family: 'IBM Plex Serif', Georgia, serif;
  font-size: 1.85rem;
  font-weight: 500;
  letter-spacing: -0.018em;
  line-height: 1.18;
  margin: 60px 0 18px;
  color: var(--ink);
  padding-top: 18px;
  border-top: 1px solid var(--ink);
}
.article h2:first-of-type { margin-top: 0; border-top: none; padding-top: 0; }
.article h3 {
  font-family: 'IBM Plex Sans', sans-serif;
  font-size: 1.18rem;
  font-weight: 600;
  letter-spacing: -0.005em;
  line-height: 1.3;
  margin: 36px 0 12px;
  color: var(--ink);
}
.article p {
  font-size: 1.05rem;
  line-height: 1.65;
  color: var(--ink-soft);
  margin: 0 0 22px;
}
.article p strong { color: var(--ink); font-weight: 600; }
.article a {
  color: var(--teal-deep);
  border-bottom: 1px solid var(--teal-soft);
}
.article a:hover {
  color: var(--ink);
  border-bottom-color: var(--ink);
}
.article ul, .article ol {
  margin: 0 0 26px;
  padding-left: 24px;
}
.article li {
  font-size: 1.02rem;
  line-height: 1.6;
  color: var(--ink-soft);
  margin-bottom: 8px;
}
.article li strong { color: var(--ink); }

.article-meta {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--ink-faint);
  margin-bottom: 30px;
  padding-bottom: 18px;
  border-bottom: 1px dashed var(--rule);
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
}
.article-meta span strong { color: var(--ink); font-weight: 600; }

.article table {
  width: 100%;
  border-collapse: collapse;
  margin: 30px 0 36px;
  background: var(--cream-deep);
  border: 1px solid var(--ink);
  font-size: 0.94rem;
}
.article table thead th {
  background: var(--ink);
  color: var(--cream);
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  padding: 12px 16px;
  text-align: left;
  font-weight: 500;
}
.article table tbody td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--rule);
  vertical-align: top;
  color: var(--ink-soft);
}
.article table tbody tr:last-child td { border-bottom: none; }
.article table tbody td:first-child {
  color: var(--ink);
  font-weight: 500;
}
.article table tbody td.mono {
  font-family: 'IBM Plex Mono', monospace;
  color: var(--teal-deep);
  font-weight: 600;
  white-space: nowrap;
}

.callout {
  border-left: 3px solid var(--teal);
  background: var(--cream-deep);
  padding: 20px 24px;
  margin: 30px 0;
}
.callout .callout-label {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: var(--teal-deep);
  font-weight: 600;
  margin-bottom: 8px;
}
.callout p { margin: 0; font-size: 0.98rem; }
.callout.warn { border-left-color: var(--warn); }
.callout.warn .callout-label { color: var(--warn); }

.article-sources {
  margin-top: 60px;
  padding-top: 26px;
  border-top: 2px solid var(--ink);
}
.article-sources h3 {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: var(--teal-deep);
  font-weight: 600;
  margin: 0 0 14px;
}
.article-sources ol {
  list-style: decimal;
  padding-left: 22px;
  margin: 0;
}
.article-sources li {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.83rem;
  color: var(--ink-soft);
  line-height: 1.55;
  padding: 6px 0;
  border-bottom: 1px dashed var(--rule);
}
.article-sources li:last-child { border-bottom: none; }

.last-reviewed {
  margin-top: 40px;
  padding: 14px 18px;
  background: var(--cream-deep);
  border: 1px dashed var(--rule);
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  color: var(--ink-soft);
}
.last-reviewed a { color: var(--teal-deep); border-bottom: none; }

.cta-block {
  margin-top: 44px;
  padding: 32px 30px;
  background: var(--ink);
  color: var(--cream);
  border-left: 4px solid var(--teal);
}
.cta-block .cta-label {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: var(--teal);
  margin-bottom: 10px;
}
.cta-block h3 {
  font-family: 'IBM Plex Serif', Georgia, serif;
  font-size: 1.45rem;
  font-weight: 500;
  letter-spacing: -0.015em;
  margin: 0 0 12px;
  color: var(--cream);
}
.cta-block p {
  color: rgba(244, 239, 228, 0.78);
  margin: 0 0 22px;
  font-size: 0.98rem;
}
.cta-block .btn.primary {
  background: var(--teal);
  color: var(--ink);
  border-color: var(--teal);
}
.cta-block .btn.primary:hover {
  background: var(--cream);
  border-color: var(--cream);
}

/* ============ GUIDE INDEX ============ */
.guide-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  border-top: 1px solid var(--ink);
  border-bottom: 1px solid var(--ink);
}
.guide-card {
  display: grid;
  grid-template-columns: 60px 1fr 130px;
  gap: 30px;
  padding: 28px 0;
  border-bottom: 1px solid var(--rule);
  align-items: baseline;
  text-decoration: none;
  color: var(--ink);
  transition: background 0.15s ease;
}
.guide-card:last-child { border-bottom: none; }
.guide-card:hover {
  background: var(--cream-deep);
  padding-left: 16px;
  padding-right: 16px;
}
.guide-num {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.78rem;
  color: var(--teal-deep);
  letter-spacing: 0.06em;
  font-weight: 600;
}
.guide-info h3 {
  font-family: 'IBM Plex Serif', Georgia, serif;
  font-size: 1.32rem;
  font-weight: 500;
  letter-spacing: -0.015em;
  line-height: 1.2;
  margin: 0 0 10px;
  color: var(--ink);
}
.guide-info p {
  font-size: 0.96rem;
  color: var(--ink-soft);
  line-height: 1.5;
  margin: 0;
}
.guide-readtime {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.74rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--ink-faint);
  text-align: right;
}

/* ============ TIER 1 (about / faq / etc) ============ */
.prose {
  padding: 70px 0 90px;
  background: var(--cream);
}
.prose .wrap { max-width: 740px; }
.prose h2 {
  font-family: 'IBM Plex Serif', Georgia, serif;
  font-size: 1.7rem;
  font-weight: 500;
  letter-spacing: -0.018em;
  line-height: 1.18;
  margin: 50px 0 16px;
  color: var(--ink);
  padding-top: 18px;
  border-top: 1px solid var(--ink);
}
.prose h2:first-of-type { margin-top: 0; border-top: none; padding-top: 0; }
.prose h3 {
  font-family: 'IBM Plex Sans', sans-serif;
  font-size: 1.1rem;
  font-weight: 600;
  margin: 28px 0 10px;
  color: var(--ink);
}
.prose p, .prose li {
  font-size: 1.04rem;
  line-height: 1.65;
  color: var(--ink-soft);
}
.prose p { margin: 0 0 22px; }
.prose ul, .prose ol { margin: 0 0 24px; padding-left: 22px; }
.prose li { margin-bottom: 8px; }
.prose a {
  color: var(--teal-deep);
  border-bottom: 1px solid var(--teal-soft);
}
.prose a:hover { color: var(--ink); border-bottom-color: var(--ink); }
.prose strong { color: var(--ink); font-weight: 600; }

.faq-item {
  border-bottom: 1px solid var(--rule);
  padding: 22px 0;
}
.faq-item:first-child { border-top: 1px solid var(--ink); }
.faq-item:last-child { border-bottom: 1px solid var(--ink); }
.faq-item h3 {
  font-family: 'IBM Plex Serif', Georgia, serif;
  font-size: 1.18rem;
  font-weight: 500;
  letter-spacing: -0.01em;
  margin: 0 0 12px;
  color: var(--ink);
}
.faq-item p { margin: 0 0 10px; }
.faq-item p:last-child { margin-bottom: 0; }

.source-block {
  margin: 26px 0;
  padding: 20px 22px;
  background: var(--cream-deep);
  border-left: 3px solid var(--teal);
}
.source-block h3 {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: var(--teal-deep);
  margin: 0 0 8px;
  font-weight: 600;
}
.source-block p { font-size: 0.95rem; margin: 0 0 8px; }
.source-block p:last-child { margin-bottom: 0; }
.source-block a { font-family: 'IBM Plex Mono', monospace; font-size: 0.86rem; }

.corrections-empty {
  padding: 40px 30px;
  background: var(--cream-deep);
  border: 1px dashed var(--rule);
  text-align: center;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.92rem;
  color: var(--ink-soft);
}

@media (max-width: 920px) {
  .hero-grid { grid-template-columns: 1fr 1fr; }
  .metric:nth-child(2) { border-right: none; }
  .metric:nth-child(1), .metric:nth-child(2) { border-bottom: 1px solid var(--rule); }
  .ref-list { grid-template-columns: 1fr 1fr; }
  .brief-grid { grid-template-columns: 1fr 1fr; }
  .brief-cell:nth-child(2) { border-right: none; }
  .brief-cell:nth-child(1), .brief-cell:nth-child(2) { border-bottom: 1px solid var(--rule); }
  .science-two { grid-template-columns: 1fr; gap: 40px; }
  .matrix-cards { grid-template-columns: 1fr 1fr; }
  .matrix-card:nth-child(2) { border-right: none; }
  .matrix-card:nth-child(1), .matrix-card:nth-child(2) { border-bottom: 1px solid var(--rule); }
  .order-inner { grid-template-columns: 1fr; gap: 50px; }
  .foot-top { grid-template-columns: 1fr; gap: 40px; }
}
@media (max-width: 920px) {
  .guide-card { grid-template-columns: 50px 1fr; gap: 20px; }
  .guide-readtime { grid-column: 1 / -1; padding-left: 70px; text-align: left; }
  .article-meta { flex-direction: column; gap: 6px; }
}
@media (max-width: 600px) {
  .wrap { padding: 0 22px; }
  .hero { padding: 50px 0 60px; }
  .hero-grid { grid-template-columns: 1fr; }
  .metric { border-right: none; border-bottom: 1px solid var(--rule); }
  .metric:last-child { border-bottom: none; }
  .ref-list { grid-template-columns: 1fr; }
  .brief-grid { grid-template-columns: 1fr; }
  .brief-cell { border-right: none; border-bottom: 1px solid var(--rule); }
  .brief-cell:last-child { border-bottom: none; }
  .brief-head { grid-template-columns: 1fr; }
  .matrix-cards { grid-template-columns: 1fr; }
  .matrix-card { border-right: none; border-bottom: 1px solid var(--rule); }
  .matrix-card:last-child { border-bottom: none; }
  .foot-cols { grid-template-columns: 1fr 1fr; }
  .methodology, .sample, .science, .filter-matrix, .order { padding: 70px 0; }
  .orderform .row.two { grid-template-columns: 1fr; }
}

/* generated brand mark */
.brand .brand-mark { width: 46px; height: 46px; border-radius: 11px; object-fit: contain; display: block; }