:root {
  --bg: #f6f8fb;
  --card: #ffffff;
  --text: #0f172a;
  --muted: #475569;
  --primary: #00a3d7;
  --border: #e2e8f0;
  --ok: #0ea5e9;
  --err: #ef4444;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
  background: var(--bg);
  color: var(--text);
}

.topbar {
  background: linear-gradient(90deg, var(--primary), #1cb0d9);
  color: white;
  padding: 28px 0;
}

.container {
  width: min(1100px, calc(100% - 32px));
  margin: 0 auto;
}

.topbar h1 { margin: 0; font-size: 22px; }
.topbar p { margin: 6px 0 0; opacity: .9; }

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 18px;
  margin: 18px 0;
  box-shadow: 0 1px 0 rgba(15, 23, 42, 0.03);
}

.grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
}
@media (min-width: 900px) {
  .grid { grid-template-columns: 1.2fr .8fr; }
}

.muted { color: var(--muted); }
.form { display: grid; gap: 10px; max-width: 520px; }
label { font-weight: 600; }
input {
  padding: 12px 12px;
  border: 1px solid var(--border);
  border-radius: 10px;
  font-size: 14px;
}
button, .btn-secondary {
  display: inline-block;
  border: 0;
  background: var(--primary);
  color: white;
  padding: 10px 14px;
  border-radius: 10px;
  font-weight: 700;
  cursor: pointer;
  text-decoration: none;
  text-align: center;
}
.btn-secondary {
  background: #0f172a;
}

.alert {
  padding: 12px 12px;
  border-radius: 10px;
  margin: 12px 0;
  border: 1px solid var(--border);
}
.alert-ok {
  background: rgba(14, 165, 233, .1);
  border-color: rgba(14, 165, 233, .25);
}
.alert-error {
  background: rgba(239, 68, 68, .08);
  border-color: rgba(239, 68, 68, .25);
}

.pre {
  background: #0b1220;
  color: #e2e8f0;
  border-radius: 12px;
  padding: 12px;
  overflow: auto;
  font-size: 12px;
  line-height: 1.4;
}

.copybox {
  display: grid;
  gap: 10px;
}
@media (min-width: 720px) {
  .copybox { grid-template-columns: 1fr auto; align-items: center; }
}

.list {
  margin: 0;
  padding-left: 18px;
}
.steps { line-height: 1.7; }

.footer {
  padding: 18px 0 30px;
  color: var(--muted);
}
code {
  background: #eef2ff;
  padding: 2px 6px;
  border-radius: 8px;
}