:root {
  color-scheme: light dark;
  --ink: #14201c;
  --muted: #5a6761;
  --brand: #145b72;
  --brand-strong: #0d4557;
  --brand-soft: #e4f1f4;
  --paper: #f3f6f4;
  --surface: #ffffff;
  --line: #d5deda;
  --seal: #e3a23b;
  --success: #19734e;
  --shadow: 0 18px 55px rgba(20, 32, 28, 0.08);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 88% 5%, rgba(20, 91, 114, 0.12), transparent 30rem),
    var(--paper);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "PingFang SC", sans-serif;
  line-height: 1.65;
}

a { color: var(--brand); }

.shell {
  width: min(1040px, calc(100% - 32px));
  margin: 0 auto;
}

header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 24px 0;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  color: var(--ink);
  font-weight: 760;
  text-decoration: none;
}

.mark {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border-radius: 12px;
  color: #fff;
  background: var(--brand);
  box-shadow: 0 8px 18px rgba(20, 91, 114, 0.22);
}

nav { display: flex; gap: 18px; flex-wrap: wrap; }
nav a { color: var(--muted); font-size: 0.94rem; text-decoration: none; }
nav a:hover { color: var(--brand); }

.hero {
  display: grid;
  grid-template-columns: 1.3fr 0.7fr;
  gap: 24px;
  padding: 72px 0 48px;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--brand);
  font-size: 0.84rem;
  font-weight: 760;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

h1, h2, h3 { line-height: 1.18; }
h1 { margin: 0; font-size: clamp(2.5rem, 7vw, 5.4rem); letter-spacing: -0.055em; }
h2 { margin: 0 0 18px; font-size: clamp(1.65rem, 4vw, 2.5rem); letter-spacing: -0.025em; }
h3 { margin: 0 0 8px; font-size: 1.05rem; }

.lead {
  max-width: 720px;
  margin: 22px 0 0;
  color: var(--muted);
  font-size: 1.08rem;
}

.stamp {
  align-self: end;
  padding: 26px;
  border: 1px solid rgba(227, 162, 59, 0.45);
  border-radius: 24px;
  background: rgba(255, 255, 255, 0.72);
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
}

.stamp strong { display: block; color: var(--brand-strong); font-size: 1.3rem; }
.stamp span { color: var(--muted); font-size: 0.94rem; }

.actions { display: flex; gap: 12px; margin-top: 28px; flex-wrap: wrap; }
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 18px;
  border: 1px solid var(--line);
  border-radius: 14px;
  color: var(--ink);
  background: var(--surface);
  font-weight: 680;
  text-decoration: none;
}
.button.primary { color: #fff; border-color: var(--brand); background: var(--brand); }

.section { padding: 34px 0; }
.grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.grid.two { grid-template-columns: repeat(2, 1fr); }

.card {
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: 20px;
  background: var(--surface);
  box-shadow: 0 8px 30px rgba(20, 32, 28, 0.04);
}
.card p, .card li { color: var(--muted); }
.card p:last-child { margin-bottom: 0; }

.notice {
  padding: 18px 20px;
  border-left: 4px solid var(--seal);
  border-radius: 0 16px 16px 0;
  background: rgba(227, 162, 59, 0.12);
}

.policy { max-width: 820px; padding: 54px 0; }
.policy section {
  margin: 18px 0;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--surface);
}
.policy p, .policy li { color: var(--muted); }
.policy ul { padding-left: 1.25rem; }

.meta { color: var(--muted); font-size: 0.9rem; }

footer {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  margin-top: 48px;
  padding: 26px 0 40px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.88rem;
}

@media (prefers-color-scheme: dark) {
  :root {
    --ink: #f2f6f4;
    --muted: #b7c3be;
    --brand: #65c5e2;
    --brand-strong: #8dd7eb;
    --brand-soft: #16343d;
    --paper: #0e1513;
    --surface: #18221e;
    --line: #34423c;
    --seal: #f0b957;
  }
  .stamp { background: rgba(24, 34, 30, 0.78); }
  .button.primary { color: #07110f; }
}

@media (max-width: 760px) {
  header, footer { align-items: flex-start; flex-direction: column; }
  .hero { grid-template-columns: 1fr; padding-top: 42px; }
  .grid, .grid.two { grid-template-columns: 1fr; }
  nav { gap: 12px; }
}