:root {
  color-scheme: dark;
  --bg: #070b10;
  --panel: #101822;
  --ink: #e8ecf5;
  --muted: #9fb3c8;
  --accent: #4fc3f7;
  --line: rgba(80, 170, 220, 0.28);
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: radial-gradient(circle at 50% 0%, #102b3a 0%, var(--bg) 58%);
  color: var(--ink);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
  font-size: 14px;
  line-height: 1.65;
}
a { color: var(--accent); text-decoration: underline; text-underline-offset: 2px; }
a:hover { color: #9be4ff; }
.wrap { width: min(940px, 92vw); margin: 28px auto 48px; }
.top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 18px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: rgba(16, 24, 34, 0.92);
  margin-bottom: 14px;
}
.brand { font-weight: 900; letter-spacing: 0.12em; color: #cbeaff; font-size: 14px; }
.back { font-size: 12px; font-weight: 800; }
.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 14px;
  padding: 10px 18px;
  border: 1px solid rgba(255, 255, 255, 0.07);
  border-radius: 10px;
  background: rgba(9, 14, 21, 0.72);
  font-size: 12px;
  margin-bottom: 18px;
}
.nav a { text-decoration: none; color: var(--muted); }
.nav a:hover, .nav a.on { color: var(--accent); }
.card {
  padding: 26px 30px 30px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: linear-gradient(180deg, rgba(18, 28, 40, 0.98), rgba(9, 14, 21, 0.98));
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.45);
}
h1 { margin: 0 0 4px; font-size: 24px; letter-spacing: 0.01em; }
.meta { margin: 0 0 22px; color: var(--muted); font-size: 12px; }
h2 { margin: 26px 0 8px; font-size: 16px; color: #cbeaff; }
h3 { margin: 18px 0 6px; font-size: 14px; color: #d8e6f2; }
p, li { color: #c6d4e2; }
ul, ol { padding-left: 22px; }
li { margin: 4px 0; }
.box {
  margin: 16px 0;
  padding: 12px 14px;
  border: 1px solid rgba(255, 255, 255, 0.09);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.03);
  color: var(--muted);
  font-size: 12.5px;
}
table { width: 100%; border-collapse: collapse; margin: 10px 0 16px; font-size: 12.5px; }
th, td { text-align: left; padding: 8px 10px; border-bottom: 1px solid rgba(255, 255, 255, 0.07); vertical-align: top; }
th { color: #cbeaff; font-size: 11px; text-transform: uppercase; letter-spacing: 0.04em; }
code { background: rgba(255, 255, 255, 0.06); padding: 1px 5px; border-radius: 4px; font-size: 12px; }
.footer { margin-top: 18px; color: #6f8498; font-size: 11px; text-align: center; }
.form { display: flex; flex-direction: column; gap: 10px; margin-top: 14px; }
.form label { display: flex; flex-direction: column; gap: 4px; color: var(--muted); font-size: 12px; }
.form input, .form select, .form textarea {
  width: 100%;
  padding: 9px 10px;
  border: 1px solid rgba(80, 170, 220, 0.35);
  border-radius: 6px;
  background: #0b131b;
  color: var(--ink);
  font: inherit;
}
.form textarea { min-height: 90px; resize: vertical; }
.form button, .btn {
  display: inline-block;
  width: fit-content;
  padding: 10px 16px;
  border: 1px solid rgba(56, 189, 248, 0.6);
  border-radius: 7px;
  background: linear-gradient(180deg, #1b7fb5, #135f8c);
  color: #fff;
  font: inherit;
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.03em;
  cursor: pointer;
  text-decoration: none;
}
.form button:hover, .btn:hover { background: linear-gradient(180deg, #2499d4, #176f9f); }
.form button:disabled { opacity: 0.55; cursor: wait; }
.status { margin-top: 12px; font-size: 12.5px; }
.status.ok { color: #4ade80; }
.status.err { color: #fca5a5; }
.hint { color: var(--muted); font-size: 12px; }
@media (max-width: 640px) {
  .wrap { width: 94vw; margin-top: 14px; }
  .card { padding: 20px 16px 22px; }
  .top { padding: 12px; }
  h1 { font-size: 20px; }
}