:root {
  --bg: #f3f7fb;
  --panel: #ffffff;
  --line: #d4e1ec;
  --text: #12344d;
  --muted: #5a7388;
  --accent: #00a8c0;
  --accent-2: #007ea6;
  --navy: #12344d;
  --brand-red: #c81e24;
  --radius: 12px;
  --shadow: 0 8px 24px rgba(18, 52, 77, 0.08);
}
* { box-sizing: border-box; }
html, body { margin: 0; min-height: 100%; }
body {
  font-family: Arial, Helvetica, sans-serif;
  background: var(--bg);
  color: var(--text);
}
body::before {
  content: "";
  display: block;
  height: 4px;
  background: linear-gradient(90deg, var(--accent) 0 78%, var(--brand-red) 78% 100%);
}
.wrap { max-width: 980px; margin: 0 auto; padding: 0 20px; }
.top { background: #fff; border-bottom: 1px solid var(--line); }
.bar { display: flex; justify-content: space-between; align-items: center; padding: 16px 20px; gap: 16px; flex-wrap: wrap; }
.brand { font-weight: 700; letter-spacing: 0.04em; font-size: 1.2rem; color: var(--accent); text-decoration: none; }
.brand span { color: var(--brand-red); }
nav a { color: var(--navy); margin-inline-start: 14px; text-decoration: none; font-weight: 600; font-size: 0.92rem; }
nav a:hover { color: var(--accent-2); }
main.wrap { padding: 32px 20px 48px; }
h1 { margin: 0 0 8px; font-size: 2rem; }
h1::after {
  content: "";
  display: block;
  width: 48px;
  height: 3px;
  margin-top: 10px;
  background: var(--brand-red);
  border-radius: 2px;
}
.hero p, .sub, p { color: var(--muted); line-height: 1.65; }
.actions { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 20px; }
.btn {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  padding: 11px 18px;
  border-radius: 8px;
  text-decoration: none;
  font-weight: 700;
  border: 0;
  cursor: pointer;
  font: inherit;
}
.btn:hover { background: var(--accent-2); text-decoration: none; color: #fff; }
.btn.secondary { background: #fff; color: var(--navy); border: 1px solid var(--line); }
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 14px; margin: 24px 0; }
.card, .panel, section {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px;
  box-shadow: var(--shadow);
  margin-bottom: 12px;
}
.card h2, .panel h2, section h2 { margin: 0 0 8px; font-size: 1.05rem; color: var(--navy); }
.form { display: grid; gap: 12px; max-width: 480px; }
label { display: block; font-weight: 700; font-size: 0.85rem; margin-bottom: 4px; }
input {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  font: inherit;
}
.errors { background: #fff1f1; color: var(--brand-red); padding: 10px 12px; border-radius: 8px; }
.ok { background: #e8f8fb; color: var(--navy); padding: 10px 12px; border-radius: 8px; }
.keybox {
  font-family: Consolas, monospace;
  font-size: 1.1rem;
  letter-spacing: 0.04em;
  background: #0f2a38;
  color: #fff;
  padding: 14px;
  border-radius: 8px;
  word-break: break-all;
}
ul.clean, ol.clean { margin: 0; padding-inline-start: 18px; color: var(--muted); line-height: 1.7; }
footer.wrap { color: var(--muted); font-size: 0.85rem; padding: 24px 20px 40px; }
code, pre { font-family: Consolas, monospace; font-size: 0.85rem; }
pre { background: #0f2a38; color: #e8eef4; border-radius: 8px; padding: 12px; overflow: auto; }
@media (max-width: 640px) {
  h1 { font-size: 1.55rem; }
}