:root {
  --bg: #f6f7fb;
  --card: #ffffff;
  --text: #0f172a;
  --muted: #475569;
  --border: rgba(15, 23, 42, 0.10);
  --shadow: 0 20px 45px rgba(15, 23, 42, 0.08);
  --radius: 16px;
  --focus: rgba(2, 132, 199, 0.25);
  --accent: #0284c7;
  --danger: #b91c1c;
  --success: #166534;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji","Segoe UI Emoji";
  color: var(--text);
  background: radial-gradient(1200px 700px at 20% 0%, #ffffff 0%, var(--bg) 45%, #eef2ff 100%);
}

.container {
  max-width: 980px;
  margin: 0 auto;
  padding: 28px 18px 60px;
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 0 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--text);
  font-weight: 750;
  letter-spacing: -0.02em;
}
.brand-badge {
  width: 34px;
  height: 34px;
  border-radius: 10px;
  background: linear-gradient(135deg, #e0f2fe, #eef2ff);
  border: 1px solid var(--border);
  display: grid;
  place-items: center;
  font-weight: 900;
  color: var(--accent);
}

.nav a.link {
  color: var(--muted);
  text-decoration: none;
  font-weight: 650;
}
.nav a.link:hover { color: var(--text); }

.grid {
  display: grid;
  gap: 18px;
  grid-template-columns: 1fr;
}
@media (min-width: 900px) {
  .grid { grid-template-columns: 1.1fr 0.9fr; gap: 22px; }
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 22px;
}

h1 {
  margin: 0 0 10px;
  font-size: 28px;
  letter-spacing: -0.03em;
}
p {
  margin: 0 0 16px;
  color: var(--muted);
  line-height: 1.55;
}

.form {
  display: grid;
  gap: 14px;
}

.field {
  display: grid;
  gap: 8px;
}

label {
  font-weight: 750;
  font-size: 13px;
  color: var(--text);
}

input, textarea {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 12px 12px;
  font-size: 15px;
  outline: none;
  background: #fff;
  color: var(--text);
}
textarea { min-height: 140px; resize: vertical; }

input:focus, textarea:focus {
  border-color: rgba(2, 132, 199, 0.45);
  box-shadow: 0 0 0 6px var(--focus);
}

.row {
  display: grid;
  gap: 12px;
}
@media (min-width: 650px) {
  .row { grid-template-columns: 1fr 1fr; }
}

.actions {
  display: flex;
  align-items: center;
  gap: 12px;
  justify-content: space-between;
  flex-wrap: wrap;
  margin-top: 2px;
}

button {
  appearance: none;
  border: 0;
  background: linear-gradient(135deg, #0284c7, #4f46e5);
  color: #fff;
  font-weight: 750;
  border-radius: 999px;
  padding: 12px 16px;
  cursor: pointer;
  box-shadow: 0 10px 25px rgba(2, 132, 199, 0.22);
}
button:disabled {
  opacity: 0.65;
  cursor: not-allowed;
}

.small {
  font-size: 12px;
  color: var(--muted);
}

.alert {
  border-radius: 14px;
  padding: 12px 14px;
  border: 1px solid var(--border);
  background: #fff;
}
.alert.error {
  border-color: rgba(185, 28, 28, 0.25);
  background: rgba(185, 28, 28, 0.05);
  color: var(--danger);
}
.alert.success {
  border-color: rgba(22, 101, 52, 0.25);
  background: rgba(22, 101, 52, 0.05);
  color: var(--success);
}

.kv {
  display: grid;
  gap: 10px;
  margin-top: 8px;
}
.kv-item {
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 12px 14px;
  background: #fff;
}
.kv-item strong { display: block; margin-bottom: 4px; }