:root {
  color-scheme: light;
  --bg: #f5f5f7;
  --surface: #ffffff;
  --text: #1d1d1f;
  --secondary: #6e6e73;
  --border: rgba(0, 0, 0, 0.08);
  --accent: #1d4ed8;
  --accent-soft: rgba(29, 78, 216, 0.08);
  --focus: #0071e3;
  --radius: 16px;
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.04);
}

@media (prefers-color-scheme: dark) {
  :root {
    color-scheme: dark;
    --bg: #000000;
    --surface: #161617;
    --text: #f5f5f7;
    --secondary: #a1a1a6;
    --border: rgba(255, 255, 255, 0.1);
    --accent: #7aa2ff;
    --accent-soft: rgba(122, 162, 255, 0.12);
    --focus: #2997ff;
    --shadow: none;
  }
}

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

html {
  scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  * {
    transition: none !important;
  }
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI",
    system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.55;
  font-size: 17px;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--accent);
  text-underline-offset: 0.15em;
}

a:hover {
  text-decoration-thickness: 2px;
}

a:focus-visible,
summary:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 3px;
  border-radius: 4px;
}

.wrap {
  max-width: 920px;
  margin: 0 auto;
  padding: 0 22px 72px;
}

.top {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding: 28px 0 8px;
}

.brand {
  font-size: 21px;
  font-weight: 600;
  letter-spacing: -0.03em;
  color: var(--text);
  text-decoration: none;
}

.brand span {
  font-weight: 400;
  color: var(--secondary);
  margin-left: 8px;
}

.back {
  font-size: 15px;
  color: var(--secondary);
  text-decoration: none;
}

.back:hover {
  color: var(--text);
}

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

.nav a {
  color: var(--secondary);
  text-decoration: none;
  font-size: 15px;
}

.nav a:hover,
.nav a[aria-current="page"] {
  color: var(--text);
}

.kicker {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--secondary);
  margin-bottom: 10px;
}

.doc-meta {
  margin: 0 0 14px;
  font-size: 0.95rem;
  color: var(--secondary);
}

.toc-label {
  font-size: 13px;
  color: var(--secondary);
  margin: 0 0 10px;
}

.toc {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
}

.toc a {
  display: inline-block;
  color: var(--text);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 8px 12px;
}

.toc a:hover {
  color: var(--accent);
}

.legal .card + .card,
.legal .group + .group {
  margin-top: 12px;
}

.legal .card h3 {
  margin-top: 18px;
}

.legal .card h3:first-child {
  margin-top: 0;
}

.legal .card p {
  color: var(--secondary);
}

.hero {
  padding: 48px 0 36px;
}

.hero h1 {
  margin: 0 0 14px;
  font-size: clamp(2rem, 5vw, 2.75rem);
  font-weight: 600;
  letter-spacing: -0.035em;
  line-height: 1.1;
}

.lede,
.note {
  margin: 0;
  max-width: 38rem;
  color: var(--secondary);
}

.lede {
  font-size: 1.125rem;
  margin-bottom: 14px;
}

.note {
  font-size: 0.98rem;
}

section {
  padding: 8px 0 28px;
}

h2 {
  margin: 0 0 12px;
  font-size: 1.35rem;
  font-weight: 600;
  letter-spacing: -0.025em;
}

h3 {
  margin: 0 0 8px;
  font-size: 1.02rem;
  font-weight: 600;
  letter-spacing: -0.015em;
}

p {
  margin: 0 0 12px;
}

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

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 22px 22px 24px;
}

.contact .intro {
  color: var(--secondary);
  margin-bottom: 18px;
}

.email-block {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin-bottom: 16px;
}

.email-block dt {
  font-size: 13px;
  color: var(--secondary);
}

.email-block dt:not(:first-of-type) {
  margin-top: 14px;
}

.email-block dd {
  margin: 0;
}

.email {
  display: inline-block;
  font-size: 1.2rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  text-decoration: none;
  color: var(--accent);
  padding: 6px 0;
}

.email:hover {
  text-decoration: underline;
}

.hint {
  font-size: 0.95rem;
  color: var(--secondary);
}

.faq details {
  border-bottom: 1px solid var(--border);
}

.faq details:first-of-type {
  border-top: 1px solid var(--border);
}

.faq summary {
  cursor: pointer;
  list-style: none;
  padding: 16px 0;
  font-weight: 600;
  letter-spacing: -0.015em;
}

.faq summary::-webkit-details-marker {
  display: none;
}

.faq summary::after {
  content: "+";
  float: right;
  font-weight: 400;
  color: var(--secondary);
}

.faq details[open] summary::after {
  content: "–";
}

.faq details p {
  padding: 0 0 16px;
  color: var(--secondary);
}

.steps {
  margin: 8px 0 0;
  padding-left: 1.15rem;
  color: var(--secondary);
}

.steps li + li {
  margin-top: 6px;
}

.trouble .card + .card {
  margin-top: 12px;
}

.about p:first-of-type {
  font-size: 1.05rem;
}

.meta {
  margin-top: 10px;
  font-size: 0.95rem;
  color: var(--secondary);
}

.foot {
  margin-top: 28px;
  padding-top: 22px;
  border-top: 1px solid var(--border);
  color: var(--secondary);
  font-size: 13px;
}

.foot-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px 20px;
}

.foot nav {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.foot a {
  color: var(--secondary);
  text-decoration: none;
}

.foot a:hover {
  color: var(--text);
}

.made {
  margin: 14px 0 0;
}

@media (max-width: 640px) {
  .wrap {
    padding: 0 20px 56px;
  }

  .top {
    padding-top: 22px;
  }

  .hero {
    padding: 32px 0 24px;
  }

  .card {
    padding: 18px 16px 20px;
  }

  .email {
    font-size: 1.1rem;
  }
}