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

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

body {
  margin: 0;
  background: var(--page);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: var(--step-body);
  font-weight: var(--weight-body);
  line-height: 1.7;
  text-rendering: optimizeLegibility;
}

h1, h2, h3 { margin: 0; font-weight: var(--weight-heading); line-height: 1.3; }
p { margin: 0; }
ul, ol, dl, dd, dt { margin: 0; padding: 0; }
li { list-style: none; }

a { color: inherit; text-decoration: none; }
.prose a, .card-text a, .cardlink a, .footer-note a, .reqrow a, .reqgrid-item a {
  border-bottom: 1.5px solid var(--underline);
}
.prose a:hover, .card-text a:hover, .cardlink a:hover, .footer-note a:hover { border-bottom-color: currentColor; }

:focus-visible { outline: 2px solid var(--focus); outline-offset: 2px; border-radius: 2px; }

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

.skip {
  position: absolute; left: -9999px; top: 0; z-index: 10;
  background: var(--accent); color: var(--on-accent);
  padding: 10px 16px; border-radius: var(--radius-control);
}
.skip:focus { left: 12px; top: 12px; }

.mono { font-family: var(--font-mono); font-variant-numeric: tabular-nums; }

.shell {
  width: 100%;
  max-width: var(--column);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.kicker {
  font-size: var(--step-micro);
  font-weight: var(--weight-label);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}

/* ---------- top bar ---------- */

.topbar { border-bottom: 1px solid var(--border); background: var(--page); }

.topbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  min-height: 58px;
}

.brand {
  font-size: var(--step-card);
  font-weight: var(--weight-heading);
  letter-spacing: -0.01em;
}

.nav { display: flex; gap: 20px; flex-wrap: wrap; }

.nav-link { font-size: var(--step-small); color: var(--muted); padding-block: 4px; }
.nav-link:hover { color: var(--text); }
.nav-link.is-current { color: var(--text); border-bottom: 1.5px solid var(--underline); }

.topbar-actions { display: flex; align-items: center; gap: 6px; }

.iconbtn {
  display: inline-flex; align-items: center; justify-content: center;
  width: 34px; height: 34px; padding: 0;
  background: none; border: 0; border-radius: var(--radius-control);
  color: var(--muted); cursor: pointer;
}
.iconbtn:hover { color: var(--text); }

.icon-moon { display: none; }
[data-theme="dark"] .icon-sun { display: none; }
[data-theme="dark"] .icon-moon { display: inline; }

.menubtn { display: none; }

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

.hero {
  background: var(--hero-bg);
  color: var(--hero-text);
  border-bottom: 1px solid var(--hero-border);
  padding-block: 56px;
}

.hero-kicker { color: var(--hero-muted); margin-bottom: 16px; }

.hero-title {
  font-size: var(--step-hero);
  letter-spacing: -0.02em;
  color: var(--accent);
  margin-bottom: 14px;
}

.hero-lead { max-width: 46ch; color: var(--hero-text); margin-bottom: 26px; }

.btnrow { display: flex; flex-wrap: wrap; gap: 10px; }

.btn {
  display: inline-flex; align-items: center; justify-content: center;
  min-height: 40px; padding: 0 18px;
  font-size: var(--step-small); font-weight: var(--weight-label);
  border-radius: var(--radius-control);
}
.btn-accent { background: var(--accent); color: var(--on-accent); }
.btn-ghost { border: 1px solid var(--quote-border); color: var(--hero-text); }

/* ---------- sections ---------- */

.stack-sections { display: grid; gap: 16px; padding-block: 32px 56px; }

.page { padding-block: 40px 56px; display: grid; gap: 20px; }

.page-title {
  font-size: var(--step-section);
  letter-spacing: -0.015em;
}

.section-title {
  font-size: var(--step-card);
  letter-spacing: -0.01em;
  margin-top: 12px;
}

.prose { max-width: 68ch; color: var(--text); }

/* ---------- card ---------- */

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  padding: 24px 26px;
}
.card-tight { padding: 18px 20px; }

.card-title { font-size: var(--step-card); letter-spacing: -0.01em; margin-block: 8px 10px; }
.card-subtitle { font-size: var(--step-small); font-weight: var(--weight-heading); margin-bottom: 6px; }
.card-text { color: var(--muted); font-size: var(--step-small); max-width: 68ch; }

.cardgrid { display: grid; gap: 12px; grid-template-columns: repeat(auto-fit, minmax(min(260px, 100%), 1fr)); }
.cardgrid .section-title { grid-column: 1 / -1; }

.cardlink { font-size: var(--step-small); margin-top: 14px; }

.fineprint { font-size: var(--step-micro); color: var(--muted); text-transform: none; letter-spacing: 0; margin-top: 12px; }

/* ---------- quote block (inverted island) ---------- */

.quote {
  background: var(--quote-bg);
  color: var(--quote-text);
  border-radius: var(--radius-card);
  padding: 24px 26px;
}
.quote .kicker { color: var(--quote-muted); }
.quote .act-name { color: var(--quote-text); }

/* the license card becomes the quote in dark theme */
.quote-in-dark {
  background: var(--price-bg);
  color: var(--price-text);
  border-color: var(--price-border);
}
.quote-in-dark .kicker { color: var(--price-muted); }
.quote-in-dark .ptable th { color: var(--price-muted); }
.quote-in-dark .ptable td { color: var(--price-text); }
.quote-in-dark .ptable tr + tr th, .quote-in-dark .ptable tr + tr td { border-top-color: var(--price-rule); }
.quote-in-dark .fineprint { color: var(--price-muted); }
.quote-in-dark .cardlink a { border-bottom-color: var(--price-underline); }

/* ---------- accent block ---------- */

.accent {
  background: var(--accent);
  color: var(--on-accent);
  border-radius: var(--radius-card);
  padding: 24px 26px;
}
.accent .kicker { color: var(--on-accent-muted); }
.accent-title { font-size: var(--step-card); letter-spacing: -0.01em; margin-block: 8px 8px; max-width: 40ch; }
.accent-text { font-size: var(--step-small); color: var(--on-accent-muted); max-width: 66ch; }
.accent-list { margin-top: 12px; display: grid; gap: 6px; }
.accent-list li { font-size: var(--step-small); color: var(--on-accent-muted); padding-left: 16px; position: relative; }
.accent-list li::before { content: "—"; position: absolute; left: 0; }

/* ---------- chips ---------- */

.chips { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 14px; }

.chip {
  font-size: var(--step-micro);
  font-weight: var(--weight-label);
  letter-spacing: 0.01em;
  background: var(--chip-bg);
  color: var(--chip-text);
  padding: 5px 10px;
  border-radius: var(--radius-chip);
}
.chip-done { background: var(--chip-done-bg); color: var(--chip-done-text); }

/* ---------- tags ---------- */

.tags { display: flex; flex-wrap: wrap; gap: 6px; }

.tag {
  font-size: var(--step-small);
  border: 1px solid var(--border);
  border-radius: var(--radius-chip);
  padding: 4px 10px;
  color: var(--text);
}

/* ---------- price table ---------- */

.ptable { width: 100%; border-collapse: collapse; margin-top: 12px; }
.ptable th, .ptable td { text-align: left; padding: 9px 0; font-weight: var(--weight-body); font-size: var(--step-small); }
.ptable th { color: var(--muted); }
.ptable td { text-align: right; color: var(--text); white-space: nowrap; }
.ptable tr + tr th, .ptable tr + tr td { border-top: 1px solid var(--rule); }

/* ---------- definition lists ---------- */

.reqlist { display: grid; }
.reqrow { display: grid; grid-template-columns: 240px 1fr; gap: 16px; padding: 11px 0; }
.reqrow + .reqrow { border-top: 1px solid var(--rule); }
.reqrow dt { color: var(--muted); font-size: var(--step-small); }
.reqrow dd { font-size: var(--step-small); }

.acts { display: grid; gap: 16px; }
.act { display: grid; gap: 6px; }
.act + .act { border-top: 1px solid var(--rule); padding-top: 16px; }
.act-code { font-size: var(--step-card); font-weight: var(--weight-heading); color: var(--accent); }
.quote .act-code { color: var(--accent); }
.act-name { font-size: var(--step-small); color: var(--muted); }
.quote .act-name { color: var(--quote-text); }
.quote .act + .act { border-top-color: var(--quote-border); }

.stack { display: grid; gap: 18px; }
.stack-group { display: grid; gap: 8px; }
.stack-group dt { font-size: var(--step-micro); font-weight: var(--weight-label); letter-spacing: 0.08em; text-transform: uppercase; color: var(--muted); }

/* ---------- footer ---------- */

.footer { border-top: 1px solid var(--border); padding-block: 28px 40px; margin-top: 8px; }

.reqgrid { display: grid; gap: 14px 28px; grid-template-columns: repeat(3, minmax(0, 1fr)); margin-top: 14px; }
.reqgrid-item dt { font-size: var(--step-micro); color: var(--muted); margin-bottom: 2px; }
.reqgrid-item dd { font-size: var(--step-small); }

.footer-note { font-size: var(--step-micro); color: var(--muted); margin-top: 20px; }

/* ---------- mobile ---------- */

@media (max-width: 720px) {
  .menubtn { display: inline-flex; }

  .nav {
    display: none;
    position: absolute;
    left: 0; right: 0;
    top: 100%;
    flex-direction: column;
    gap: 0;
    background: var(--page);
    border-bottom: 1px solid var(--border);
    padding: 8px var(--gutter) 16px;
    z-index: 5;
  }
  .topbar { position: relative; }
  .topbar[data-menu="open"] .nav { display: flex; }
  .nav-link { padding-block: 10px; font-size: var(--step-body); }

  .hero { padding-block: 30px; }
  .hero-title { letter-spacing: -0.015em; }
  .hero-title br { display: none; }
  .hero-lead { margin-bottom: 18px; }
  .btnrow { flex-direction: column; align-items: stretch; }
  .btn { width: 100%; }

  .stack-sections { gap: 12px; padding-block: 20px 36px; }
  .page { padding-block: 26px 36px; gap: 16px; }
  .card, .quote, .accent { padding: 18px 18px; }

  .reqrow { grid-template-columns: 1fr; gap: 2px; }
  .reqgrid { grid-template-columns: 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; animation: none !important; }
}