:root {
  --bg: #05070b;
  --card: #0f141c;
  --card-2: #141b24;
  --text: #edf2f7;
  --muted: #9aa7b8;
  --border: #263140;
  --accent: #3b82f6;
  --accent-hover: #2563eb;
  --secondary: #334155;
  --secondary-hover: #475569;
  --danger: #fda4af;
  --danger-bg: #2a0f16;
  --danger-border: #4c1d28;
  --success: #86efac;
  --success-bg: #0f1f16;
  --success-border: #1f3a2a;
  --shadow: 0 18px 40px rgba(0, 0, 0, 0.35);
}
* { box-sizing: border-box; }
html, body { min-height: 100%; }
body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  background: radial-gradient(circle at top, #101722 0%, var(--bg) 55%);
  color: var(--text);
}
a { color: inherit; }
.container {
  max-width: 980px;
  margin: 40px auto;
  padding: 0 20px;
}
.container.narrow { max-width: 560px; }
.card {
  background: linear-gradient(180deg, var(--card) 0%, var(--card-2) 100%);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 24px;
  box-shadow: var(--shadow);
}
.card + .card { margin-top: 20px; }
h1, h2, h3 { margin-top: 0; }
p { line-height: 1.55; }
.small { color: var(--muted); font-size: 14px; }
.top-gap { margin-top: 16px; }
label {
  display: block;
  margin-bottom: 8px;
  font-weight: 700;
}
input[type="text"], input[type="password"], input[type="number"], input[type="file"] {
  width: 100%;
  padding: 12px;
  border: 1px solid var(--border);
  border-radius: 10px;
  margin-bottom: 16px;
  background: #0b1118;
  color: var(--text);
}
input[type="file"] { padding: 10px; }
button, .btn {
  display: inline-block;
  padding: 12px 18px;
  border-radius: 10px;
  border: 0;
  background: var(--accent);
  color: #fff;
  text-decoration: none;
  cursor: pointer;
  font-weight: 700;
}
button:hover, .btn:hover { background: var(--accent-hover); }
.btn-secondary { background: var(--secondary); }
.btn-secondary:hover { background: var(--secondary-hover); }
.nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  margin-bottom: 20px;
}
.alert {
  padding: 12px 14px;
  border-radius: 10px;
  margin-bottom: 16px;
  border: 1px solid transparent;
}
.alert-error {
  background: var(--danger-bg);
  color: var(--danger);
  border-color: var(--danger-border);
}
.alert-success {
  background: var(--success-bg);
  color: var(--success);
  border-color: var(--success-border);
}
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
}
.kv {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 10px;
}
.kv div {
  padding: 8px 0;
  border-bottom: 1px solid var(--border);
}
code {
  background: #0b1118;
  border: 1px solid var(--border);
  padding: 2px 6px;
  border-radius: 6px;
}
.menu-list a {
  display: block;
  padding: 14px 16px;
  border: 1px solid var(--border);
  border-radius: 12px;
  margin-bottom: 12px;
  text-decoration: none;
  color: var(--text);
  font-weight: 700;
  background: #0b1118;
}
.menu-list a:hover {
  border-color: #3a4f67;
  background: #121a24;
}
.actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}
.center-note {
  text-align: center;
}
.hidden-iframe {
  display: none;
}
@media (max-width: 720px) {
  .nav, .kv {
    display: block;
  }
  .kv { grid-template-columns: 1fr; }
}