:root {
  color-scheme: light dark;
  --navy: #123a63;
  --navy-deep: #0b2744;
  --blue: #66b9e8;
  --blue-strong: #1e6fa8;
  --orange: #f2a24a;
  --paper: #ffffff;
  --ink: #172638;
  --muted: #586779;
  --line: #d7e2ec;
  --soft-blue: #edf7fd;
  --soft-orange: #fff7ec;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 1rem;
  line-height: 1.68;
  color: var(--ink);
  background: #f3f7fa;
}

a { color: #0d6897; }
a:hover { text-decoration-thickness: 2px; }

header {
  color: #fff;
  background:
    radial-gradient(circle at 92% 12%, rgb(102 185 232 / 32%), transparent 28rem),
    linear-gradient(135deg, var(--navy-deep), var(--navy));
  padding: 2rem 1.25rem 2.15rem;
}

.brand,
.page-nav,
main,
footer {
  width: min(820px, calc(100% - 2rem));
  margin-inline: auto;
}

.brand {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.brand img {
  width: 58px;
  height: 58px;
  border-radius: 16px;
  box-shadow: 0 8px 24px rgb(0 0 0 / 22%);
}

h1 {
  margin: 0;
  font-size: clamp(1.75rem, 4vw, 2.45rem);
  line-height: 1.18;
}

.subtitle {
  margin: .3rem 0 0;
  color: #d9edf8;
}

.page-nav {
  display: flex;
  flex-wrap: wrap;
  gap: .55rem 1.1rem;
  padding-top: 1.3rem;
}

.page-nav a {
  color: #fff;
  font-weight: 700;
  text-decoration: none;
}

.page-nav a:hover { text-decoration: underline; }

main {
  margin-top: 1.5rem;
  margin-bottom: 2rem;
  padding: 1.6rem clamp(1.15rem, 4vw, 2.65rem) 2.7rem;
  border: 1px solid var(--line);
  border-radius: 20px;
  background: var(--paper);
  box-shadow: 0 14px 44px rgb(18 58 99 / 10%);
}

h2 {
  margin-top: 2rem;
  margin-bottom: .55rem;
  color: var(--navy);
  font-size: 1.42rem;
  line-height: 1.3;
}

h3 {
  margin-top: 1.3rem;
  margin-bottom: .35rem;
  color: var(--navy);
  font-size: 1.08rem;
  line-height: 1.35;
}

p { margin: .75rem 0; }
ul, ol { padding-left: 1.45rem; }
li { margin: .4rem 0; }

.notice {
  margin: 1rem 0 1.4rem;
  padding: 1rem 1.15rem;
  border-left: 5px solid var(--blue-strong);
  border-radius: 9px;
  background: var(--soft-blue);
}

.warning {
  border-left-color: var(--orange);
  background: var(--soft-orange);
}

.action-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: .85rem;
  margin: 1.2rem 0;
}

.action-card {
  display: block;
  min-height: 100%;
  padding: 1.05rem 1.15rem;
  border: 1px solid #bdd7e7;
  border-radius: 14px;
  color: var(--ink);
  background: #f5fbff;
  text-decoration: none;
}

.action-card:hover {
  border-color: var(--blue-strong);
  box-shadow: 0 8px 22px rgb(18 58 99 / 9%);
}

.action-card strong {
  display: block;
  color: var(--navy);
  font-size: 1.05rem;
}

.action-card span {
  display: block;
  margin-top: .2rem;
  color: var(--muted);
}

.store-links {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
  margin-top: 1rem;
}

.store-button {
  display: inline-flex;
  align-items: center;
  gap: .65rem;
  min-width: 205px;
  padding: .72rem 1rem;
  border-radius: 12px;
  color: #fff;
  background: var(--navy-deep);
  font-weight: 800;
  text-decoration: none;
}

.store-button:hover {
  background: var(--navy);
  box-shadow: 0 7px 18px rgb(11 39 68 / 22%);
}

.store-icon {
  display: grid;
  width: 32px;
  height: 32px;
  place-items: center;
  border-radius: 9px;
  color: var(--navy-deep);
  background: var(--orange);
  font-size: 1.08rem;
}

.contact-card {
  padding: 1rem 1.15rem;
  border: 1px solid #c8dbe9;
  border-radius: 12px;
  background: #f3f8fc;
}

.back-link {
  display: inline-block;
  margin-top: 1.2rem;
  font-weight: 700;
}

footer {
  padding: 0 0 2rem;
  color: var(--muted);
  font-size: .95rem;
}

footer a { margin-left: .8rem; }

@media (max-width: 680px) {
  header { padding-top: 1.5rem; }
  .brand img { width: 52px; height: 52px; }
  main {
    width: 100%;
    margin-top: 0;
    border-inline: 0;
    border-radius: 0;
    box-shadow: none;
  }
  .action-list { grid-template-columns: 1fr; }
  .store-button { width: 100%; }
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #18232f;
    --ink: #eef4fa;
    --muted: #b8c7d5;
    --line: #3a4a5c;
    --soft-blue: #152f3e;
    --soft-orange: #372b1d;
  }
  body { background: #0f1821; }
  h2, h3 { color: #9cdcf7; }
  a { color: #80d2f4; }
  .action-card { background: #142936; border-color: #31566d; }
  .action-card strong { color: #9cdcf7; }
  .contact-card { background: #162b38; border-color: #31566d; }
  .store-button { background: #071b2c; }
}