:root {
  --white: #ffffff;
  --ink: #111111;
  --muted: #666666;
  --line: #e6e6e6;
  --quiet: #f5f5f5;
  --shadow: 0 18px 50px rgba(0, 0, 0, 0.08), 0 2px 8px rgba(0, 0, 0, 0.04);
  --font: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Helvetica, Arial, sans-serif;
  --measure: 36rem;
  --page: min(1180px, calc(100% - 3rem));
  --header-h: 3.5rem;
}

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

html {
  scroll-behavior: smooth;
}

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

body {
  margin: 0;
  background: var(--white);
  color: var(--ink);
  font-family: var(--font);
  font-size: 1rem;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: var(--ink);
  text-underline-offset: 0.16em;
}

a:hover {
  color: var(--muted);
}

:focus-visible {
  outline: 2px solid var(--ink);
  outline-offset: 3px;
}

.skip {
  position: absolute;
  left: 0.75rem;
  top: -4rem;
  z-index: 100;
  background: var(--ink);
  color: var(--white);
  padding: 0.45rem 0.75rem;
  text-decoration: none;
  font-size: 0.875rem;
}

.skip:focus {
  top: 0.75rem;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  height: var(--header-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 max(1.5rem, calc((100% - 1180px) / 2));
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  text-decoration: none;
  color: var(--ink);
  font-size: 0.875rem;
  font-weight: 500;
}

.brand img {
  width: 18px;
  height: 18px;
}

.nav {
  display: flex;
  gap: 1.25rem;
}

.nav a {
  color: var(--muted);
  text-decoration: none;
  font-size: 0.8125rem;
}

.nav a:hover {
  color: var(--ink);
}

.wrap {
  width: var(--page);
  margin-inline: auto;
}

.hero {
  padding: 4.25rem 0 2.25rem;
  text-align: center;
}

.product-name {
  margin: 0 0 0.85rem;
  font-size: 0.8125rem;
  font-weight: 500;
  letter-spacing: 0.01em;
  color: var(--muted);
}

h1 {
  margin: 0 auto;
  max-width: 18em;
  font-size: clamp(1.85rem, 4.2vw, 2.75rem);
  font-weight: 600;
  letter-spacing: -0.035em;
  line-height: 1.15;
}

.hero-copy {
  margin: 1rem auto 0;
  max-width: 32rem;
  color: var(--muted);
  font-size: 1.0625rem;
  line-height: 1.5;
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: 1rem 1.35rem;
  margin-top: 1.65rem;
}

.badge {
  margin: 0;
  display: inline-flex;
  align-items: center;
  min-height: 1.85rem;
  padding: 0.2rem 0.7rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--quiet);
  color: var(--muted);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.01em;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.4rem;
  padding: 0.45rem 1rem;
  border-radius: 8px;
  background: var(--ink);
  color: var(--white);
  text-decoration: none;
  font-size: 0.875rem;
  font-weight: 500;
}

.btn:hover {
  color: var(--white);
  opacity: 0.86;
}

.product-stage {
  padding: 0 0 4.5rem;
}

.shot {
  margin: 0 auto;
  max-width: 1180px;
}

.shot img {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 12px;
  box-shadow: var(--shadow);
  background: var(--white);
}

.section {
  padding: 4.25rem 0;
  border-top: 1px solid var(--line);
  scroll-margin-top: calc(var(--header-h) + 0.75rem);
}

.section h2 {
  margin: 0 0 0.75rem;
  font-size: clamp(1.4rem, 2.6vw, 1.85rem);
  font-weight: 600;
  letter-spacing: -0.03em;
  line-height: 1.2;
}

.prose {
  max-width: var(--measure);
  color: var(--muted);
}

.prose p {
  margin: 0 0 0.85rem;
}

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

.privacy-list {
  margin: 1.35rem 0 0;
  padding: 0;
  list-style: none;
  max-width: 40rem;
}

.privacy-list li {
  padding: 0.7rem 0;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.9375rem;
}

.privacy-list li:last-child {
  border-bottom: 1px solid var(--line);
}

.privacy-list strong {
  color: var(--ink);
  font-weight: 600;
}

.reading-block {
  margin-top: 1.75rem;
}

.segmented {
  display: inline-flex;
  border: 1px solid var(--line);
  border-radius: 999px;
  overflow: hidden;
  background: var(--white);
}

.segmented span {
  padding: 0.4rem 0.95rem;
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--muted);
}

.segmented span.is-active {
  background: var(--ink);
  color: var(--white);
}

.mode-copy {
  margin: 1.15rem 0 0;
  padding: 0;
  list-style: none;
  max-width: 40rem;
}

.mode-copy li {
  padding: 0.65rem 0;
  border-top: 1px solid var(--line);
  font-size: 0.9375rem;
  color: var(--muted);
}

.mode-copy li:last-child {
  border-bottom: 1px solid var(--line);
}

.mode-copy strong {
  display: inline-block;
  min-width: 5.5rem;
  color: var(--ink);
  font-weight: 600;
}

.reading-shot {
  margin-top: 1.75rem;
}

.qualities {
  margin: 1.5rem 0 0;
  padding: 0;
  list-style: none;
  max-width: 40rem;
}

.qualities li {
  display: grid;
  grid-template-columns: 0.85rem 1fr;
  gap: 0.65rem;
  padding: 0.8rem 0;
  border-top: 1px solid var(--line);
  font-size: 0.9875rem;
}

.qualities li:last-child {
  border-bottom: 1px solid var(--line);
}

.qualities li::before {
  content: "";
  width: 0.72rem;
  height: 0.72rem;
  margin-top: 0.32em;
  background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3E%3Cpath fill='none' stroke='%23111111' stroke-width='2' stroke-linecap='round' stroke-linejoin='round' d='M2.5 8.5 6.2 12.2 13.5 3.8'/%3E%3C/svg%3E") center / contain no-repeat;
}

.inventory {
  margin-top: 1.5rem;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.inventory > summary {
  cursor: pointer;
  padding: 0.85rem 0;
  font-size: 0.875rem;
  font-weight: 500;
  list-style: none;
  color: var(--ink);
}

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

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

.inventory[open] > summary::after {
  content: "–";
}

.feature-groups {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.75rem 2.5rem;
  padding: 0.25rem 0 1.25rem;
}

.feature-groups h3 {
  margin: 0 0 0.45rem;
  font-size: 0.6875rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  font-weight: 600;
}

.feature-groups ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

.feature-groups li {
  display: grid;
  grid-template-columns: 0.85rem 1fr;
  gap: 0.55rem;
  align-items: start;
  padding: 0.5rem 0;
  border-top: 1px solid var(--line);
  font-size: 0.875rem;
}

.feature-groups li::before {
  content: "";
  width: 0.72rem;
  height: 0.72rem;
  margin-top: 0.28em;
  background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3E%3Cpath fill='none' stroke='%23111111' stroke-width='2' stroke-linecap='round' stroke-linejoin='round' d='M2.5 8.5 6.2 12.2 13.5 3.8'/%3E%3C/svg%3E") center / contain no-repeat;
}

.note {
  margin: 1.15rem 0 0;
  max-width: 40rem;
  color: var(--muted);
  font-size: 0.875rem;
}

.aside {
  margin: 1.15rem 0 0;
  max-width: 36rem;
  color: var(--muted);
  font-size: 0.875rem;
}

.faq {
  margin-top: 1.15rem;
  border-top: 1px solid #d0d0d0;
}

.faq details {
  border-bottom: 1px solid #d0d0d0;
}

.faq summary {
  cursor: pointer;
  padding: 0.7rem 0;
  font-size: 0.9375rem;
  font-weight: 500;
  list-style: none;
}

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

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

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

.faq p {
  margin: 0 0 0.75rem;
  max-width: var(--measure);
  color: var(--muted);
  font-size: 0.9375rem;
}

.close {
  text-align: center;
  padding-top: 4.75rem;
  padding-bottom: 4.75rem;
}

.close .prose,
.close h2 {
  margin-inline: auto;
}

.close h2 {
  max-width: 18em;
}

.close-contact {
  margin: 1.35rem 0 0;
  color: var(--muted);
}

.credit {
  margin: 1.1rem 0 0;
  color: var(--muted);
  font-size: 0.875rem;
}

.credit a {
  color: inherit;
}

.site-footer {
  border-top: 1px solid var(--line);
  padding: 1.15rem 0 1.75rem;
  color: var(--muted);
  font-size: 0.8125rem;
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.site-footer a {
  color: inherit;
  text-decoration: none;
}

.site-footer a:hover {
  color: var(--ink);
}

@media (max-width: 900px) {
  .feature-groups {
    grid-template-columns: 1fr;
  }

  .site-header {
    height: auto;
    min-height: var(--header-h);
    flex-wrap: wrap;
    gap: 0.4rem 1rem;
    padding-top: 0.65rem;
    padding-bottom: 0.65rem;
  }

  .nav {
    width: 100%;
    flex-wrap: wrap;
    gap: 0.65rem 1rem;
  }

  .hero {
    padding-top: 3rem;
  }
}

@media (max-width: 640px) {
  :root {
    --page: calc(100% - 2rem);
  }

  .mode-copy strong {
    display: block;
    min-width: 0;
    margin-bottom: 0.15rem;
  }
}