/* Base, page frame, header, footer and section grids */

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 16px);
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; animation: none !important; }
}

body {
  margin: 0;
  font-family: var(--sans);
  font-size: 1.0625rem;
  line-height: 1.6;
  color: var(--ink);
  background: var(--white);
  -webkit-font-smoothing: antialiased;
}
main { overflow-x: clip; }
img { display: block; max-width: 100%; height: auto; }
a { color: var(--blue); text-decoration-thickness: 1px; text-underline-offset: .2em; }
a:hover { text-decoration-thickness: 2px; }
:focus-visible { outline: 3px solid var(--focus); outline-offset: 3px; }
.on-dark { --focus: var(--yellow); }

h1, h2, h3 {
  font-family: var(--serif);
  font-weight: 600;
  line-height: 1.08;
  letter-spacing: -.015em;
  margin: 0 0 .6em;
  text-wrap: balance;
}
h1 { font-size: clamp(2.3rem, 1.5rem + 3.6vw, 4.25rem); }
h2 { font-size: clamp(1.8rem, 1.35rem + 2vw, 2.9rem); }
h3 { font-size: clamp(1.2rem, 1.1rem + .4vw, 1.4rem); line-height: 1.25; letter-spacing: -.005em; }
p { margin: 0 0 1em; }
ul, ol { margin: 0; }
code { font-family: var(--mono); font-size: .9em; }

.tnum, table, .num, .price, .figure strong { font-variant-numeric: tabular-nums lining-nums; }

.visually-hidden {
  position: absolute !important;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0);
  white-space: nowrap; border: 0;
}

.skip-link {
  position: absolute;
  left: 1rem; top: -120px;
  z-index: 100;
  background: var(--yellow);
  color: var(--ink);
  padding: .8rem 1.1rem;
  font-weight: 600;
  text-decoration: none;
  --focus: var(--ink);
}
.skip-link:focus { top: 1rem; }

.wrap {
  width: 100%;
  max-width: calc(var(--wrap) + 2 * var(--gutter));
  margin-inline: auto;
  padding-inline: var(--gutter);
}
.wrap--narrow { max-width: calc(46rem + 2 * var(--gutter)); }
.small { font-size: .875rem; line-height: 1.55; color: var(--ink-faint); }
.lead { font-size: clamp(1.08rem, 1rem + .3vw, 1.24rem); line-height: 1.6; color: var(--ink-soft); max-width: 37rem; }
.muted { color: var(--ink-faint); }

/* ---------- Header ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--header-bg);
  border-bottom: 1px solid var(--rule);
}
.header-inner { position: relative; display: flex; align-items: center; gap: 1.5rem; min-height: var(--header-h); }

.brand { display: inline-flex; align-items: center; gap: .6rem; color: var(--ink); text-decoration: none; flex: none; min-height: var(--target); }
.brand-mark { width: 30px; height: 30px; flex: none; }
.mk-bar { fill: var(--blue); }
.mk-rule { fill: var(--ink); }
.brand-word { font-family: var(--serif); font-size: 1.55rem; font-weight: 600; letter-spacing: -.02em; line-height: 1; padding-bottom: .12em; }
.brand-desc {
  font-size: .8rem;
  line-height: 1.25;
  color: var(--ink-soft);
  margin-left: .35rem;
  padding-left: .85rem;
  border-left: 1px solid var(--rule);
  max-width: 11.5rem;
}

.site-nav { margin-left: auto; display: flex; align-items: center; gap: 1.6rem; }
.site-nav a:not(.btn) {
  color: var(--ink);
  text-decoration: none;
  font-size: .95rem;
  font-weight: 500;
  padding: .6rem 0;
  border-bottom: 2px solid transparent;
  white-space: nowrap;
}
.site-nav a:not(.btn):hover,
.site-nav a[aria-current="page"] { border-bottom-color: var(--yellow); }
/* Header Buy button with its guarantee caption underneath (every Buy sits next to the guarantee). */
.nav-buy { display: inline-flex; flex-direction: column; align-items: center; gap: .1rem; margin-left: .4rem; }
.nav-guarantee { display: inline-flex; align-items: center; gap: .3rem; font-size: .7rem; font-weight: 500; line-height: 1.2; color: var(--ink-soft); white-space: nowrap; }
.nav-guarantee .icon { width: .85rem; height: .85rem; color: var(--blue); }
@media (min-width: 901px) and (max-width: 1120px) { .site-nav { gap: 1.15rem; } }
@media (min-width: 901px) and (max-width: 960px) { .site-nav { gap: .8rem; } }

.nav-toggle {
  display: none;
  margin-left: auto;
  align-items: center;
  gap: .55rem;
  min-height: var(--target);
  padding: .5rem .9rem;
  border: 1px solid var(--ink);
  border-radius: 2px;
  background: var(--white);
  color: var(--ink);
  font: inherit;
  font-size: .92rem;
  font-weight: 600;
  cursor: pointer;
}
.nav-toggle-icon { width: 16px; height: 12px; position: relative; }
.nav-toggle-icon::before, .nav-toggle-icon::after {
  content: "";
  position: absolute; left: 0; right: 0;
  height: 2px; background: currentColor;
  transition: transform .2s, top .2s;
}
.nav-toggle-icon::before { top: 2px; }
.nav-toggle-icon::after { top: 8px; }
.nav-toggle[aria-expanded="true"] .nav-toggle-icon::before { top: 5px; transform: rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-icon::after { top: 5px; transform: rotate(-45deg); }

/* The descriptor needs the room the Buy button and its guarantee caption take; it shows from 1241px. */
@media (max-width: 1240px) { .brand-desc { display: none; } }
@media (max-width: 900px) {
  .js .nav-toggle { display: inline-flex; }
  .js .site-nav {
    position: absolute;
    top: 100%;
    left: 0; right: 0;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: .5rem var(--gutter) 1.5rem;
    background: var(--white);
    border-bottom: 1px solid var(--ink);
    box-shadow: var(--shadow-menu);
  }
  .js .site-nav.is-open { display: flex; }
  .js .site-nav a:not(.btn) { padding: .95rem 0; border-bottom: 1px solid var(--rule); font-size: 1.05rem; }
  .js .site-nav .nav-buy { align-items: stretch; gap: .55rem; margin: 1.1rem 0 0; }
  .js .site-nav .nav-guarantee { justify-content: center; font-size: .88rem; white-space: normal; }
  .js .site-nav .nav-guarantee .icon { width: 1rem; height: 1rem; }
  .no-js .header-inner { flex-wrap: wrap; padding-block: .75rem; }
  .no-js .site-nav { flex-wrap: wrap; gap: .25rem 1.2rem; margin-left: 0; width: 100%; }
}

/* ---------- Sections ---------- */

.section { padding-block: clamp(4rem, 8vw, 7rem); }
.section + .section { border-top: 1px solid var(--rule); }
.section.alt { background: var(--paper); }
.section.dark { background: var(--deep); color: var(--white); border-top: 0; }
.section.dark + .section { border-top: 0; }
.section--tight { padding-block: clamp(2.5rem, 5vw, 4rem); }

.section-grid { display: grid; grid-template-columns: minmax(0, 3fr) minmax(0, 9fr); gap: 1.5rem clamp(2rem, 4vw, 4rem); }
.span-all { grid-column: 1 / -1; }

.marker {
  align-self: start;
  position: sticky;
  top: calc(var(--header-h) + 24px);
  display: flex;
  align-items: baseline;
  gap: .75rem;
  margin: 0;
  padding-top: .8rem;
  border-top: 2px solid var(--ink);
  font-size: .9rem;
  color: var(--ink-soft);
}
.marker .num, .marker-inline .num { font-family: var(--serif); font-size: 1.1rem; font-weight: 600; color: var(--ink); }
.dark .marker { border-top-color: var(--yellow); color: var(--on-dark-soft); }
.dark .marker .num { color: var(--white); }
.marker-inline {
  display: flex;
  align-items: baseline;
  gap: .75rem;
  margin: 0 0 1.5rem;
  padding-top: .7rem;
  border-top: 2px solid var(--ink);
  font-size: .9rem;
  color: var(--ink-soft);
  max-width: 16rem;
}

.section-head { max-width: 46rem; margin-bottom: clamp(2rem, 4vw, 3rem); }
.section-head h2 { margin-bottom: .45em; }
.section-head p { font-size: 1.1rem; color: var(--ink-soft); }
.section-head p:last-child { margin-bottom: 0; }
.dark .section-head p { color: var(--on-dark-strong); }

@media (max-width: 900px) {
  .section-grid { grid-template-columns: minmax(0, 1fr); }
  .marker { position: static; max-width: 16rem; }
}

/* Page header for inner pages */
.page-head { position: relative; background: var(--paper); padding-block: clamp(2.5rem, 6vw, 4.5rem) clamp(2rem, 5vw, 3.5rem); border-bottom: 1px solid var(--rule); }
.page-head h1 { max-width: 18ch; }
.page-head .lead { margin-bottom: 0; }

.ruled-bg::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: linear-gradient(to bottom, rgba(23, 69, 218, .075) 1px, transparent 1px);
  background-size: 100% 2rem;
  -webkit-mask-image: linear-gradient(to bottom, transparent, #000 18%, #000 72%, transparent);
          mask-image: linear-gradient(to bottom, transparent, #000 18%, #000 72%, transparent);
  pointer-events: none;
}
.ruled-bg > * { position: relative; }

/* ---------- Home hero ---------- */

.hero { position: relative; background: var(--paper); padding-block: clamp(3rem, 7vw, 6.5rem) clamp(3.25rem, 6vw, 5.5rem); }
.hero-grid { display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr); gap: clamp(2.5rem, 5vw, 5rem); align-items: center; }
.hero h1 { max-width: 13.5ch; }
.hl { background: linear-gradient(transparent 60%, var(--yellow-mid) 60%, var(--yellow-mid) 92%, transparent 92%); padding-inline: .06em; margin-inline: -.06em; }
@media (max-width: 960px) {
  .hero-grid { grid-template-columns: minmax(0, 1fr); }
  .hero h1 { max-width: 16ch; }
}

/* ---------- Product page ---------- */

.pdp {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 21.5rem;
  column-gap: clamp(2rem, 4vw, 4.5rem);
}
.pdp > * { grid-column: 1; min-width: 0; }
.pdp > .pdp-aside { grid-column: 2; grid-row: 1 / span 20; }
.pdp-hero { position: relative; padding-block: clamp(2rem, 4vw, 3rem) 0; }
.pdp-hero h1 { max-width: 14ch; }
.pdp-band { position: relative; }
.pdp-band::after {
  content: "";
  position: absolute;
  z-index: -1;
  top: 0; bottom: 0;
  left: -100vw; right: -100vw;
  background: var(--paper);
}
.pdp-shot { padding-bottom: clamp(3rem, 6vw, 4.5rem); }
.pdp-section { padding-block: clamp(3rem, 6vw, 4.75rem); }
.pdp-section > h2 { max-width: 20ch; }
.pdp-section .section-head { margin-bottom: 2rem; }

@media (max-width: 1023px) {
  .pdp { grid-template-columns: minmax(0, 1fr); }
  .pdp > .pdp-aside { grid-column: 1; grid-row: auto; position: relative; }
  .pdp-aside::after {
    content: "";
    position: absolute;
    z-index: -1;
    top: 0; bottom: 0;
    left: -100vw; right: -100vw;
    background: var(--paper);
  }
}

/* ---------- Prose (policies, guides, help) ---------- */

.prose { max-width: 42rem; }
.prose h2 { font-size: clamp(1.45rem, 1.2rem + 1vw, 1.9rem); margin-top: 2.2em; }
.prose h3 { margin-top: 1.8em; }
.prose ul, .prose ol { padding-left: 1.3rem; margin: 0 0 1em; }
.prose li { margin-bottom: .4em; }
.prose table { width: 100%; border-collapse: collapse; margin: 1.5rem 0; font-size: .95rem; }
.prose th, .prose td { text-align: left; padding: .6rem .5rem; border-bottom: 1px solid var(--rule); vertical-align: top; }
.prose thead th { border-bottom: 2px solid var(--ink); font-size: .85rem; color: var(--ink-soft); }
.prose blockquote { margin: 1.5rem 0; padding: .8rem 1.1rem; background: var(--paper); border-left: 3px solid var(--blue); }
.prose-meta { font-size: .9rem; color: var(--ink-faint); }
.article-grid { display: grid; grid-template-columns: minmax(0, 1fr) 16rem; gap: clamp(2rem, 5vw, 4rem); align-items: start; }
.article-aside { position: sticky; top: calc(var(--header-h) + 24px); border-top: 2px solid var(--ink); padding-top: 1rem; font-size: .92rem; }
.article-aside ol { list-style: none; padding: 0; }
.article-aside li { padding: .35rem 0; }
@media (max-width: 900px) {
  .article-grid { grid-template-columns: minmax(0, 1fr); }
  .article-aside { position: static; order: -1; }
}

/* ---------- Footer ---------- */

.site-footer { background: var(--ink); color: var(--on-dark-text); padding: clamp(3.5rem, 6vw, 5rem) 0 2rem; }
.site-footer .brand { color: var(--white); }
.site-footer .mk-bar { fill: var(--white); }
.site-footer .mk-rule { fill: var(--yellow); }
.footer-top { display: grid; grid-template-columns: minmax(0, 4fr) minmax(0, 8fr); gap: 3rem; padding-bottom: 3rem; border-bottom: 1px solid var(--on-dark-rule); }
.footer-tagline { margin: 1.4rem 0 0; max-width: 22rem; font-size: .95rem; line-height: 1.55; color: var(--on-dark-soft); }
.footer-tagline strong { display: block; margin-bottom: .35rem; font-family: var(--serif); font-size: 1.45rem; font-weight: 600; line-height: 1.25; color: var(--white); }
.footer-links { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 2rem; }
.footer-links h2 { margin: 0 0 .6rem; font-family: var(--sans); font-size: .86rem; font-weight: 600; letter-spacing: .01em; color: var(--yellow); }
.footer-links ul { list-style: none; padding: 0; }
.footer-links a { display: inline-flex; align-items: center; min-height: var(--target); min-width: var(--target); color: var(--on-dark-strong); font-size: .93rem; text-decoration: none; }
.footer-links a:hover { text-decoration: underline; }
.footer-bottom { display: flex; flex-wrap: wrap; gap: .4rem 1.5rem; padding-top: 1.5rem; font-size: .85rem; color: var(--on-dark-muted); }
.footer-bottom p { margin: 0; }
@media (max-width: 900px) { .footer-top { grid-template-columns: minmax(0, 1fr); } }
@media (max-width: 560px) { .footer-links { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1.5rem; } }