:root {
  color-scheme: light;

  /* surfaces */
  --bg:           #ffffff;   /* page */
  --surface:      #ffffff;   /* cards, masthead, inputs, callouts */
  --tint:         #f5f7fb;   /* alternating sections, table stripes */
  --rule:         #d6dbe6;

  /* text */
  --ink:          #14243f;   /* headings, strong, emphasis */
  --muted:        #46536a;   /* body copy */
  --faint:        #8a94a6;   /* captions, hints, eyebrows */

  /* accent */
  --accent:       #1b3a6b;   /* links, primary button, focus ring */
  --accent-hover: #14243f;
  --on-accent:    #ffffff;   /* text ON the accent */

  --band:         #14243f;
  --band-ink:     #c8d1e0;
  --band-strong:  #ffffff;
  --band-sep:     #4a5a78;

  --alert:        #b4232a;
  --caution:      #c8791b;
  --better:       #2e7d46;

  /* Legacy aliases. Do not use in new rules. */
  --navy:        var(--ink);
  --slate:       var(--accent);
  --grey-blue:   var(--muted);
  --grey-light:  var(--faint);
  --worse:       var(--alert);

  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;

  --measure: 1080px;
  --gutter: 24px;
}


html[data-theme="dark"] {
  color-scheme: dark;

  --bg:           #0f1620;
  --surface:      #16202e;
  --tint:         #182231;
  --rule:         #2a3648;

  --ink:          #e8edf5;   /* 15.4:1 on --bg */
  --muted:        #b3bfd2;   /* 10.1:1 */
  --faint:        #7f8da5;   /*  5.4:1 */

  --accent:       #86aae2;   /*  8.0:1 */
  --accent-hover: #a9c4ee;
  --on-accent:    #0f1620;

  --band:         #080d14;   /* darker than the page, not lighter */
  --band-ink:     #aab6c9;
  --band-strong:  #ffffff;
  --band-sep:     #4a5a78;

  --alert:        #e8737a;   /*  7.1:1 */
  --caution:      #e0a251;
  --better:       #63c184;
}


*, *::before, *::after { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--grey-blue);
  font-family: var(--font);
  font-size: 17px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

img, svg { max-width: 100%; }


h1, h2, h3, h4 {
  color: var(--navy);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.011em;
  margin: 0 0 0.5em;
}

h1 { font-size: 2.5rem; letter-spacing: -0.021em; }
h2 { font-size: 1.75rem; margin-top: 0; }
h3 { font-size: 1.125rem; letter-spacing: -0.004em; }
h4 { font-size: 1rem; }

p { margin: 0 0 1.1em; }
p:last-child { margin-bottom: 0; }

a { color: var(--slate); text-decoration-thickness: 1px; text-underline-offset: 2px; }
a:hover { color: var(--navy); }

strong { color: var(--navy); font-weight: 600; }

small { font-size: 0.8125rem; }

code, .mono { font-family: var(--mono); font-size: 0.875em; }

.eyebrow {
  display: block;
  margin: 0 0 0.9rem;
  color: var(--grey-light);
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.lede {
  font-size: 1.1875rem;
  color: var(--grey-blue);
  max-width: 62ch;
}

.note {
  font-size: 0.875rem;
  color: var(--grey-light);
}

.caption {
  display: block;
  margin-top: 0.75rem;
  font-size: 0.8125rem;
  color: var(--grey-light);
}


.wrap {
  max-width: var(--measure);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.section { padding: 72px 0; }
.section--tint { background: var(--tint); border-block: 1px solid var(--rule); }
.section--tight { padding: 48px 0; }

.section-head { max-width: 62ch; margin-bottom: 40px; }
.section-head p:last-child { margin-bottom: 0; }

.grid {
  display: grid;
  gap: 1px;
  background: var(--rule);
  border: 1px solid var(--rule);
}
@media (min-width: 720px) {
  .grid--3 { grid-template-columns: repeat(3, 1fr); }
  .grid--2 { grid-template-columns: repeat(2, 1fr); }
}
.grid > .cell { background: var(--surface); padding: 28px 26px; }
.section--tint .grid > .cell { background: var(--surface); }
.cell h3 { margin-bottom: 0.55em; }
.cell p { font-size: 0.9375rem; margin-bottom: 0; }

.rule { border: 0; border-top: 1px solid var(--rule); margin: 56px 0; }


.skip {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--band);
  color: var(--band-strong);
  padding: 12px 18px;
  z-index: 100;
}
.skip:focus { left: 0; color: var(--band-strong); }


.masthead {
  border-bottom: 1px solid var(--rule);
  background: var(--surface);
}
.masthead .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  min-height: 84px;
  padding-block: 14px;
}
.brand { display: inline-flex; align-items: center; text-decoration: none; }
.brand svg { display: block; height: 40px; width: auto; }

.nav-toggle { display: none; }

.nav ul {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  list-style: none;
  margin: 0;
  padding: 0;
}
.nav a {
  display: flex;
  align-items: center;
  min-height: 44px;
  padding: 0 14px;
  color: var(--grey-blue);
  font-size: 0.9375rem;
  font-weight: 500;
  text-decoration: none;
  border-radius: 2px;
  transition: color 0.15s ease, background-color 0.15s ease;
}
.nav a:hover { color: var(--navy); background: var(--tint); }
.nav a[aria-current="page"] { color: var(--navy); font-weight: 600; box-shadow: inset 0 -2px 0 var(--slate); }

.js .nav-toggle {
  display: none;
  align-items: center;
  gap: 8px;
  min-height: 44px;
  padding: 0 12px;
  background: none;
  border: 1px solid var(--rule);
  border-radius: 2px;
  color: var(--navy);
  font: inherit;
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
}
@media (max-width: 719px) {
  .js .nav-toggle { display: inline-flex; }
  .js .nav { flex-basis: 100%; }
  .js .nav[data-open="false"] { display: none; }
  .js .nav ul { flex-direction: column; align-items: stretch; gap: 0; padding-bottom: 8px; }
  .js .nav a { border-top: 1px solid var(--rule); border-radius: 0; }
  .js .nav a[aria-current="page"] { box-shadow: inset 3px 0 0 var(--slate); }
}


.hero { padding: 88px 0 72px; border-bottom: 1px solid var(--rule); }
.hero h1 { max-width: 17ch; margin-bottom: 0.4em; }
.hero .lede { max-width: 58ch; }

.page-head { padding: 64px 0 40px; border-bottom: 1px solid var(--rule); }
.page-head h1 { font-size: 2.125rem; max-width: 20ch; }


.actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 32px; }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 22px;
  border: 1px solid var(--slate);
  border-radius: 2px;
  font-size: 0.9375rem;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: background-color 0.15s ease, color 0.15s ease, border-color 0.15s ease;
}
.btn--primary { background: var(--accent); color: var(--on-accent); }
.btn--primary:hover { background: var(--accent-hover); border-color: var(--accent-hover); color: var(--on-accent); }
.btn--secondary { background: transparent; color: var(--slate); }
.btn--secondary:hover { background: var(--tint); color: var(--navy); border-color: var(--navy); }


.coverage {
  background: var(--band);
  color: var(--band-ink);
  padding: 22px 0;
}
.coverage ul {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px 28px;
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 0.875rem;
  text-align: center;
}
.coverage li { display: flex; align-items: baseline; gap: 8px; }
.coverage li + li::before { content: "·"; color: var(--band-sep); margin-right: 20px; }
.coverage b { color: var(--band-strong); font-weight: 600; }


.rigor { list-style: none; margin: 0; padding: 0; counter-reset: rigor; }
.rigor > li {
  counter-increment: rigor;
  position: relative;
  padding: 26px 0 26px 60px;
  border-top: 1px solid var(--rule);
}
.rigor > li:last-child { border-bottom: 1px solid var(--rule); }
.rigor > li::before {
  content: counter(rigor, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 27px;
  font-family: var(--mono);
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--slate);
  letter-spacing: 0.04em;
}
.rigor h3 { margin-bottom: 0.35em; }
.rigor p { margin-bottom: 0; font-size: 0.9375rem; }


.callout {
  border: 1px solid var(--rule);
  border-left: 3px solid var(--accent);
  background: var(--surface);
  padding: 24px 26px;
}
.callout--worse { border-left-color: var(--alert); }
.callout--caution { border-left-color: var(--caution); }
.callout + .callout { margin-top: 16px; }
.callout h3 { font-size: 1rem; margin-bottom: 0.4em; }
.callout p { font-size: 0.9375rem; }
.callout p:last-child { margin-bottom: 0; }

.flag-head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
}
.tag {
  display: inline-block;
  padding: 3px 8px;
  border: 1px solid currentColor;
  border-radius: 2px;
  font-family: var(--mono);
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  white-space: nowrap;
}
.tag--high { color: var(--alert); }
.tag--medium { color: var(--caution); }
.tag--source { color: var(--grey-light); }

.basis {
  margin-top: 14px;
  padding-top: 12px;
  border-top: 1px solid var(--rule);
  font-size: 0.8125rem;
  color: var(--grey-light);
}
.basis .mono { color: var(--grey-blue); font-weight: 600; letter-spacing: 0.04em; }


.product { border-top: 1px solid var(--rule); padding-top: 40px; margin-top: 56px; }
.product:first-of-type { margin-top: 0; }

@media (min-width: 860px) {
  .product-inner { display: grid; grid-template-columns: 1fr 320px; gap: 56px; align-items: start; }
}

.price {
  border: 1px solid var(--rule);
  background: var(--tint);
  padding: 24px 24px 26px;
}
.price .amount {
  display: block;
  color: var(--navy);
  font-size: 2.25rem;
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.02em;
}
.price .amount-note { display: block; margin-top: 6px; font-size: 0.8125rem; color: var(--grey-light); }
.price .btn { width: 100%; margin-top: 20px; }

.contents { list-style: none; margin: 0 0 8px; padding: 0; }
.contents li {
  position: relative;
  padding: 9px 0 9px 22px;
  border-top: 1px solid var(--rule);
  font-size: 0.9375rem;
}
.contents li:first-child { border-top: 0; }
.contents li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 18px;
  width: 8px;
  height: 1px;
  background: var(--grey-light);
}
.contents li b { color: var(--navy); font-weight: 600; }


.table-scroll { overflow-x: auto; border: 1px solid var(--rule); }

table {
  width: 100%;
  min-width: 640px;
  border-collapse: collapse;
  font-size: 0.9375rem;
}
caption {
  caption-side: top;
  text-align: left;
  padding: 16px 18px;
  border-bottom: 1px solid var(--rule);
  color: var(--grey-light);
  font-size: 0.8125rem;
}
th, td {
  padding: 14px 18px;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--rule);
}
thead th {
  color: var(--navy);
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  background: var(--tint);
}
tbody tr:last-child td { border-bottom: 0; }
td .mono { color: var(--slate); }


.method { border-top: 1px solid var(--rule); padding: 32px 0; }
.method:last-of-type { border-bottom: 1px solid var(--rule); }
.method h3 { margin-bottom: 0.6em; }
.method .body { max-width: 68ch; }

.plainlist { margin: 0 0 1.1em; padding-left: 1.15em; }
.plainlist li { margin-bottom: 0.5em; }
.plainlist li:last-child { margin-bottom: 0; }


.figure {
  margin: 0;
  border: 1px solid var(--rule);
  background: var(--surface);
  padding: 24px;
}
.figure svg { display: block; width: 100%; height: auto; }
.figure figcaption { margin-top: 16px; font-size: 0.8125rem; color: var(--grey-light); }


.form { max-width: 560px; }
.field { margin-bottom: 22px; }
.field label {
  display: block;
  margin-bottom: 7px;
  color: var(--navy);
  font-size: 0.875rem;
  font-weight: 600;
}
.field .hint { display: block; margin-top: 6px; font-size: 0.8125rem; color: var(--grey-light); font-weight: 400; }

input[type="text"],
input[type="email"],
select,
textarea {
  width: 100%;
  min-height: 48px;
  padding: 12px 14px;
  border: 1px solid var(--rule);
  border-radius: 2px;
  background: var(--surface);
  color: var(--ink);
  font: inherit;
  font-size: 1rem;
}
textarea { min-height: 140px; resize: vertical; line-height: 1.5; }
input:hover, select:hover, textarea:hover { border-color: var(--grey-light); }
input:focus, select:focus, textarea:focus { outline: 2px solid var(--slate); outline-offset: 1px; border-color: var(--slate); }

.contact-grid { display: grid; gap: 48px; }
@media (min-width: 900px) { .contact-grid { grid-template-columns: 1fr 320px; gap: 64px; } }

.aside-block { border-top: 2px solid var(--navy); padding-top: 20px; margin-bottom: 32px; }
.aside-block:last-child { margin-bottom: 0; }
.aside-block h3 { font-size: 0.9375rem; margin-bottom: 0.5em; }
.aside-block p { font-size: 0.9375rem; margin-bottom: 0.6em; }


.footer {
  border-top: 1px solid var(--rule);
  background: var(--tint);
  padding: 56px 0 48px;
  font-size: 0.875rem;
}
.footer-top { display: grid; gap: 32px; margin-bottom: 40px; }
@media (min-width: 720px) { .footer-top { grid-template-columns: 1.4fr 1fr; align-items: start; } }
.footer nav ul { list-style: none; margin: 0; padding: 0; }
.footer nav li { margin-bottom: 4px; }
.footer nav a {
  display: inline-flex;
  align-items: center;
  min-height: 32px;
  color: var(--grey-blue);
  text-decoration: none;
}
.footer nav a:hover { color: var(--navy); text-decoration: underline; }
.footer .brand svg { height: 38px; }

.disclaimer {
  border-top: 1px solid var(--rule);
  padding-top: 24px;
  max-width: 80ch;
  color: var(--grey-light);
  font-size: 0.8125rem;
  line-height: 1.6;
}
.disclaimer strong { color: var(--grey-blue); font-weight: 600; }
.colophon { margin-top: 16px; color: var(--grey-light); font-size: 0.8125rem; }


:focus-visible {
  outline: 2px solid var(--slate);
  outline-offset: 2px;
  border-radius: 1px;
}
.btn:focus-visible { outline-offset: 3px; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* --- Small screens -------------------------------------------------------- */

@media (max-width: 719px) {
  body { font-size: 16.5px; }
  h1 { font-size: 2rem; }
  h2 { font-size: 1.5rem; }
  .hero { padding: 56px 0 48px; }
  .hero h1 { max-width: none; }
  .section { padding: 56px 0; }
  .page-head { padding: 44px 0 32px; }
  .page-head h1 { font-size: 1.75rem; }
  .rigor > li { padding-left: 44px; }
  .actions .btn { width: 100%; }
  .coverage ul { flex-direction: column; align-items: center; gap: 8px; }
  .coverage li + li::before { content: none; }
}

@media print {
  /* Print is always light. Force the light tokens back regardless of theme. */
  html[data-theme="dark"] {
    --bg: #fff; --surface: #fff; --tint: #fff; --rule: #ccc;
    --ink: #000; --muted: #222; --faint: #444; --accent: #1b3a6b;
    --alert: #b4232a; --caution: #c8791b; --better: #2e7d46;
  }
  .masthead, .nav, .actions, .coverage, .theme-toggle { display: none; }
  body { font-size: 11pt; color: #000; }
  .figure svg { background: none; border: 0; padding: 0; }
}


.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  padding: 0;
  border: 1px solid var(--rule);
  border-radius: 2px;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  line-height: 0;
  margin-left: auto;
}
.theme-toggle:hover { color: var(--ink); border-color: var(--ink); }
.theme-toggle svg { width: 17px; height: 17px; fill: none; stroke: currentColor; stroke-width: 1.6;
                    stroke-linecap: round; stroke-linejoin: round; }
.theme-toggle .icon-moon { display: none; }
html[data-theme="dark"] .theme-toggle .icon-sun  { display: none; }
html[data-theme="dark"] .theme-toggle .icon-moon { display: inline; }


.masthead .wrap > .theme-toggle { margin-left: auto; }

@media (prefers-reduced-motion: no-preference) {
  body, .masthead, .theme-toggle, .callout, .cell, input, select, textarea {
    transition: background-color .15s ease, color .15s ease, border-color .15s ease;
  }
}


.brand svg { color: var(--ink); }
.brand svg .wordmark-sub { color: var(--muted); }

html[data-theme="dark"] .figure svg {
  background: #f5f7fb;
  border: 1px solid var(--rule);
  border-radius: 2px;
  padding: 12px;
}


.footer-blurb { margin-top: 16px; max-width: 44ch; }
.figure--narrow { max-width: 640px; }
.figure--narrow svg { margin: 0 auto; }