:root {
  --bg: #f5f9ff;
  --surface: #ffffff;
  --surface-tint: #eef5ff;
  --ink: #0b1b3f;
  --ink-soft: #4a5b7c;
  --line: #dce7f7;
  --sky: #8ec5ff;
  --sky-soft: #d6e9ff;
  --blue: #2f6fe4;
  --navy: #0e3a8c;
  --focus: #2f6fe4;
  --display: "Sora", "Segoe UI", Helvetica, Arial, sans-serif;
  --body: "Manrope", "Segoe UI", Helvetica, Arial, sans-serif;
  --measure: 68ch;
  --gutter: clamp(1.25rem, 4vw, 3rem);
  --radius: 18px;
  --shadow: 0 1px 2px rgba(11, 27, 63, 0.06), 0 20px 48px -24px rgba(14, 58, 140, 0.35);
}

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

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--body);
  font-size: 1.0625rem;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--blue);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.2em;
}

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

:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 3px;
  border-radius: 6px;
}

.skip {
  position: absolute;
  left: -999px;
  top: 0.5rem;
  background: var(--navy);
  color: #fff;
  padding: 0.5rem 0.75rem;
  border-radius: 8px;
  z-index: 10;
}

.skip:focus {
  left: 0.5rem;
}

.wrap {
  max-width: 72rem;
  margin: 0 auto;
  padding: 0 var(--gutter);
}

/* Masthead */
.masthead {
  position: sticky;
  top: 0;
  z-index: 5;
  background: rgba(245, 249, 255, 0.82);
  backdrop-filter: saturate(1.4) blur(10px);
  -webkit-backdrop-filter: saturate(1.4) blur(10px);
  border-bottom: 1px solid var(--line);
}

.masthead .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding-top: 1rem;
  padding-bottom: 1rem;
}

.wordmark {
  display: inline-flex;
  align-items: center;
  font-family: var(--display);
  font-weight: 600;
  font-size: 1.2rem;
  letter-spacing: -0.02em;
  color: var(--ink);
  text-decoration: none;
}

.wordmark::before {
  content: "";
  width: 1.6rem;
  height: 1.6rem;
  margin-right: 0.6rem;
  border-radius: 7px;
  background: linear-gradient(135deg, var(--sky) 0%, var(--blue) 55%, var(--navy) 100%);
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.35);
}

.wordmark span {
  color: var(--blue);
}

.masthead nav {
  display: flex;
  gap: 0.35rem;
  font-size: 0.92rem;
  font-weight: 600;
}

.masthead nav a {
  color: var(--ink-soft);
  text-decoration: none;
  padding: 0.4rem 0.8rem;
  border-radius: 999px;
}

.masthead nav a:hover,
.masthead nav a[aria-current="page"] {
  color: var(--navy);
  background: var(--sky-soft);
}

/* Hero */
.hero-band {
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(60rem 30rem at 85% -10%, rgba(142, 197, 255, 0.55), transparent 60%),
    radial-gradient(40rem 24rem at -10% 110%, rgba(47, 111, 228, 0.14), transparent 60%),
    var(--bg);
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
  gap: clamp(2rem, 6vw, 5rem);
  align-items: center;
  padding: clamp(3.5rem, 9vw, 7rem) 0 clamp(3rem, 7vw, 5.5rem);
}

.kicker {
  display: inline-block;
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--navy);
  background: var(--sky-soft);
  padding: 0.35rem 0.8rem;
  border-radius: 999px;
  margin: 0 0 1.4rem;
}

h1,
h2,
h3 {
  font-family: var(--display);
  font-weight: 600;
  letter-spacing: -0.03em;
  line-height: 1.08;
  margin: 0;
  color: var(--ink);
}

h1 {
  font-size: clamp(2.6rem, 6vw, 4.6rem);
}

h1 em {
  font-style: normal;
  background: linear-gradient(100deg, #3f86f2 0%, var(--blue) 40%, var(--navy) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.lede {
  font-size: clamp(1.1rem, 1.6vw, 1.28rem);
  color: var(--ink-soft);
  max-width: 34rem;
  margin: 1.5rem 0 0;
}

.status {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  margin-top: 2rem;
  padding: 0.6rem 1rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--surface);
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--ink-soft);
  box-shadow: 0 1px 2px rgba(11, 27, 63, 0.05);
}

.status::before {
  content: "";
  width: 0.55rem;
  height: 0.55rem;
  border-radius: 50%;
  background: var(--blue);
  box-shadow: 0 0 0 4px var(--sky-soft);
}

/* Product card */
.cards {
  position: relative;
}

.card {
  position: absolute;
  inset: 0;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.5rem 1.6rem 1.4rem;
}

.card.front {
  position: relative;
}

.card.back-2 {
  transform: translate(1.6rem, -1.4rem) scale(0.96);
  background: linear-gradient(160deg, var(--sky-soft), var(--surface-tint));
  box-shadow: none;
}

.card.back-1 {
  transform: translate(0.8rem, -0.7rem) scale(0.98);
  background: var(--surface-tint);
  box-shadow: none;
}

.card-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

.card-head span:last-child {
  color: var(--navy);
  background: var(--sky-soft);
  padding: 0.2rem 0.6rem;
  border-radius: 999px;
  letter-spacing: 0.04em;
}

.card-title {
  font-family: var(--display);
  font-weight: 600;
  font-size: 1.3rem;
  letter-spacing: -0.02em;
  line-height: 1.25;
  margin: 0 0 1rem;
}

.card dl {
  display: grid;
  grid-template-columns: 7rem 1fr;
  margin: 0;
  font-size: 0.92rem;
}

.card dt,
.card dd {
  margin: 0;
  padding: 0.45rem 0;
  border-bottom: 1px solid var(--line);
}

.card dt {
  color: var(--ink-soft);
}

.card dd {
  font-weight: 600;
}

.card dd.ok {
  color: var(--navy);
}

.card dd.ok::before {
  content: "";
  display: inline-block;
  width: 0.5rem;
  height: 0.5rem;
  margin-right: 0.45rem;
  border-radius: 50%;
  background: var(--blue);
  vertical-align: 0.08em;
}

.channels {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-top: 1.1rem;
  font-size: 0.8rem;
  font-weight: 700;
}

.channels span {
  padding: 0.3rem 0.75rem;
  border-radius: 999px;
  border: 1px solid var(--line);
  color: var(--ink-soft);
}

.channels .arrow {
  border: 0;
  padding: 0;
  color: var(--blue);
}

.channels span.on {
  background: var(--navy);
  border-color: var(--navy);
  color: #fff;
}

/* Sections */
section {
  padding: clamp(3.5rem, 8vw, 6rem) 0;
}

section.tint {
  background: var(--surface);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.section-head {
  display: grid;
  grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.2fr);
  gap: 2rem;
  align-items: end;
  margin-bottom: 2.75rem;
}

h2 {
  font-size: clamp(1.9rem, 3.4vw, 2.6rem);
}

.section-head p {
  margin: 0;
  color: var(--ink-soft);
  max-width: 38rem;
}

.drawers {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1.25rem;
}

.drawer {
  padding: 1.75rem 1.6rem 1.9rem;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: 0 1px 2px rgba(11, 27, 63, 0.04);
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.drawer:hover {
  transform: translateY(-3px);
  border-color: var(--sky);
  box-shadow: var(--shadow);
}

.drawer .label {
  display: inline-grid;
  place-items: center;
  width: 2.5rem;
  height: 2.5rem;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--sky-soft), var(--sky));
  color: var(--navy);
  font-family: var(--display);
  font-weight: 700;
  font-size: 0.95rem;
  margin-bottom: 1.2rem;
}

.drawer h3 {
  font-size: 1.3rem;
  margin-bottom: 0.55rem;
}

.drawer p {
  margin: 0;
  color: var(--ink-soft);
}

.ledger {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

.ledger li {
  display: grid;
  grid-template-columns: 2.5rem minmax(0, 1fr);
  gap: 1rem;
  padding: 1.4rem 1.4rem;
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.ledger .num {
  display: grid;
  place-items: center;
  width: 2.5rem;
  height: 2.5rem;
  border-radius: 12px;
  background: var(--navy);
  color: #fff;
  font-family: var(--display);
  font-weight: 700;
  font-size: 0.85rem;
}

.ledger strong {
  display: block;
  font-family: var(--display);
  font-weight: 600;
  font-size: 1.1rem;
  letter-spacing: -0.02em;
  margin-bottom: 0.25rem;
}

.ledger span {
  color: var(--ink-soft);
}

.note {
  margin: 1.75rem 0 0;
  color: var(--ink-soft);
}

/* Document pages */
.doc {
  max-width: var(--measure);
  padding: clamp(2.5rem, 7vw, 4.5rem) 0 4.5rem;
}

.doc h1 {
  font-size: clamp(2.2rem, 5vw, 3.2rem);
  margin-bottom: 0.75rem;
}

.doc .meta {
  display: inline-block;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--navy);
  background: var(--sky-soft);
  padding: 0.3rem 0.75rem;
  border-radius: 999px;
  margin: 0 0 2.5rem;
}

.doc h2 {
  font-size: 1.45rem;
  margin: 2.5rem 0 0.75rem;
}

.doc ul {
  padding-left: 1.2rem;
}

.doc li + li {
  margin-top: 0.4rem;
}

.doc li::marker {
  color: var(--blue);
}

.callout {
  border: 1px solid var(--sky);
  background: linear-gradient(135deg, var(--surface), var(--surface-tint));
  border-radius: var(--radius);
  padding: 1.1rem 1.4rem;
  margin: 1.5rem 0;
}

.callout p {
  margin: 0;
}

/* Footer */
footer {
  background: var(--navy);
  color: #c9dcf8;
  padding: 2.25rem 0 2.75rem;
  font-size: 0.92rem;
}

footer a {
  color: #fff;
}

footer a:hover {
  color: var(--sky);
}

footer .wrap {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 1rem;
}

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

/* Load sequence */
@media (prefers-reduced-motion: no-preference) {
  .rise {
    opacity: 0;
    transform: translateY(12px);
    animation: rise 0.7s cubic-bezier(0.2, 0.7, 0.2, 1) forwards;
  }

  .rise.d1 { animation-delay: 0.08s; }
  .rise.d2 { animation-delay: 0.18s; }
  .rise.d3 { animation-delay: 0.3s; }

  .card.front {
    animation: lift 0.9s cubic-bezier(0.2, 0.7, 0.2, 1) 0.25s both;
  }

  @keyframes rise {
    to {
      opacity: 1;
      transform: none;
    }
  }

  @keyframes lift {
    from {
      transform: translateY(20px);
      opacity: 0;
    }
    to {
      transform: none;
      opacity: 1;
    }
  }
}

@media (max-width: 52rem) {
  .hero,
  .section-head {
    grid-template-columns: 1fr;
  }

  .cards {
    margin: 1.5rem 1.6rem 0 0;
  }

  .drawers,
  .ledger {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 30rem) {
  .masthead nav a {
    padding: 0.35rem 0.6rem;
  }

  .card dl {
    grid-template-columns: 6rem 1fr;
  }
}