:root {
  color-scheme: dark;
  --bg: #0b0f17;
  --panel: #121824;
  --panel-2: #171f2d;
  --text: #edf4ff;
  --muted: #9fb0c8;
  --line: #263247;
  --gold: #d7a21c;
  --cyan: #33d6ff;
  --danger: #ff6b6b;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  background: radial-gradient(circle at 20% 0%, rgba(51, 214, 255, 0.14), transparent 28%),
    radial-gradient(circle at 78% 6%, rgba(215, 162, 28, 0.12), transparent 24%),
    var(--bg);
  color: var(--text);
  line-height: 1.55;
}

a {
  color: var(--cyan);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.shell {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
}

.topbar {
  border-bottom: 1px solid var(--line);
  background: rgba(11, 15, 23, 0.86);
  backdrop-filter: blur(12px);
  position: sticky;
  top: 0;
  z-index: 10;
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 68px;
  gap: 24px;
}

.brand {
  color: var(--text);
  font-weight: 800;
  letter-spacing: 0;
}

.brand span {
  color: var(--gold);
}

.navlinks {
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
  justify-content: flex-end;
  font-size: 14px;
}

.hero {
  padding: 56px 0 32px;
}

.eyebrow {
  color: var(--gold);
  font-size: 13px;
  font-weight: 700;
  text-transform: uppercase;
}

h1 {
  margin: 10px 0 14px;
  font-size: clamp(32px, 6vw, 58px);
  line-height: 1.02;
}

h2 {
  margin: 0 0 14px;
  font-size: 24px;
}

h3 {
  margin: 0 0 8px;
  font-size: 18px;
}

p {
  margin: 0 0 14px;
  color: var(--muted);
}

.hero p {
  max-width: 760px;
  font-size: 18px;
}

.grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  padding: 24px 0 56px;
}

.card {
  display: block;
  min-height: 178px;
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: linear-gradient(180deg, rgba(23, 31, 45, 0.94), rgba(18, 24, 36, 0.94));
}

.card:hover {
  border-color: rgba(51, 214, 255, 0.6);
  text-decoration: none;
}

.card strong {
  display: block;
  margin-bottom: 8px;
  color: var(--text);
  font-size: 18px;
}

.card span {
  display: block;
  color: var(--muted);
}

.content {
  display: grid;
  grid-template-columns: 280px minmax(0, 1fr);
  gap: 28px;
  padding: 34px 0 64px;
}

.side {
  align-self: start;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(18, 24, 36, 0.9);
  overflow: hidden;
}

.side a {
  display: block;
  padding: 13px 16px;
  color: var(--muted);
  border-bottom: 1px solid var(--line);
}

.side a:last-child {
  border-bottom: 0;
}

.side a.active,
.side a:hover {
  color: var(--text);
  background: rgba(51, 214, 255, 0.08);
  text-decoration: none;
}

.article {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(18, 24, 36, 0.88);
  padding: 28px;
}

.section {
  padding-top: 20px;
  margin-top: 20px;
  border-top: 1px solid var(--line);
}

.steps,
.plain-list {
  margin: 0;
  padding-left: 20px;
  color: var(--muted);
}

.steps li,
.plain-list li {
  margin: 8px 0;
}

.notice {
  margin: 18px 0 0;
  padding: 14px 16px;
  border: 1px solid rgba(215, 162, 28, 0.42);
  border-radius: 8px;
  background: rgba(215, 162, 28, 0.08);
  color: #f5d789;
}

.danger {
  border-color: rgba(255, 107, 107, 0.45);
  background: rgba(255, 107, 107, 0.08);
  color: #ffc1c1;
}

.footer {
  padding: 28px 0 42px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 14px;
}

@media (max-width: 840px) {
  .nav {
    align-items: flex-start;
    flex-direction: column;
    padding: 16px 0;
  }

  .navlinks {
    justify-content: flex-start;
  }

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