:root {
  color-scheme: dark;
  --ink: #eef6ff;
  --muted: #a8bad0;
  --line: rgba(168, 205, 255, 0.18);
  --panel: rgba(14, 30, 53, 0.72);
  --accent: #78dcff;
  --accent-2: #8ea6ff;
  --bg: #06101f;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  background:
    radial-gradient(circle at 12% 0%, rgba(61, 149, 255, 0.18), transparent 34rem),
    radial-gradient(circle at 92% 18%, rgba(111, 89, 255, 0.14), transparent 30rem),
    var(--bg);
  font-family: "Segoe UI", "Yu Gothic UI", "Hiragino Sans", sans-serif;
  font-size: 17px;
  line-height: 1.75;
}

a { color: var(--accent); text-underline-offset: 0.22em; }
a:hover { color: #b6edff; }

.shell {
  width: min(100% - 2rem, 940px);
  margin-inline: auto;
}

header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  padding-block: 1.2rem;
  border-bottom: 1px solid var(--line);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--ink);
  font-weight: 700;
  letter-spacing: 0.02em;
  text-decoration: none;
}

.mark {
  display: grid;
  width: 2.25rem;
  height: 2.25rem;
  place-items: center;
  border: 1px solid rgba(120, 220, 255, 0.5);
  border-radius: 0.7rem;
  background: linear-gradient(145deg, rgba(120, 220, 255, 0.16), rgba(142, 166, 255, 0.09));
  color: var(--accent);
  font-size: 0.92rem;
}

nav { display: flex; gap: 1.1rem; font-size: 0.95rem; }
nav a { color: var(--muted); text-decoration: none; }
nav a[aria-current="page"] { color: var(--ink); }

main { padding-block: clamp(3.5rem, 8vw, 7rem); }

.eyebrow {
  margin: 0 0 1rem;
  color: var(--accent);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

h1 {
  max-width: 780px;
  margin: 0;
  font-size: clamp(2.5rem, 7vw, 5rem);
  line-height: 1.05;
  letter-spacing: -0.045em;
}

.lead {
  max-width: 720px;
  margin: 1.7rem 0 0;
  color: var(--muted);
  font-size: clamp(1.05rem, 2vw, 1.3rem);
}

.flow {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  margin-top: 3.5rem;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 1.15rem;
  background: var(--line);
}

.flow article {
  min-height: 13rem;
  padding: 1.5rem;
  background: rgba(6, 16, 31, 0.92);
}

.step {
  display: inline-grid;
  width: 2rem;
  height: 2rem;
  place-items: center;
  margin-bottom: 2.2rem;
  border-radius: 999px;
  background: rgba(120, 220, 255, 0.12);
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 700;
}

h2 { margin: 0 0 0.65rem; font-size: 1.2rem; }
h3 { margin: 2.5rem 0 0.65rem; font-size: 1.15rem; }
p { margin: 0.6rem 0 0; }
.flow p, .policy p, .policy li { color: var(--muted); }

.note {
  margin-top: 2.5rem;
  padding: 1.25rem 1.4rem;
  border-left: 3px solid var(--accent);
  border-radius: 0 0.75rem 0.75rem 0;
  background: var(--panel);
}

.policy {
  max-width: 760px;
  margin-top: 3rem;
  padding: clamp(1.4rem, 4vw, 2.4rem);
  border: 1px solid var(--line);
  border-radius: 1.15rem;
  background: var(--panel);
}

.policy section + section {
  margin-top: 2.5rem;
  padding-top: 2.5rem;
  border-top: 1px solid var(--line);
}

.policy ul { margin: 0.75rem 0 0; padding-left: 1.25rem; }
.policy li + li { margin-top: 0.45rem; }

.meta { color: var(--muted); font-size: 0.92rem; }

footer {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding-block: 1.5rem 2.5rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.9rem;
}

footer p { margin: 0; }

@media (max-width: 720px) {
  header, footer { align-items: flex-start; flex-direction: column; }
  .flow { grid-template-columns: 1fr; }
  .flow article { min-height: auto; }
  .step { margin-bottom: 1rem; }
}

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