:root {
  --bg: #f2f6fb;
  --panel: #ffffff;
  --line: #d9e1eb;
  --text: #123047;
  --muted: #4a6378;
  --accent: #0c8f83;
  --accent-dark: #066f65;
  --danger: #c53232;
  --shadow: 0 10px 30px rgba(16, 45, 70, 0.08);
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  background: radial-gradient(circle at 5% 5%, #e7f6f8 0%, var(--bg) 40%);
  color: var(--text);
}

.shell {
  max-width: 1100px;
  margin: 24px auto;
  padding: 0 14px;
}

.topbar {
  background: linear-gradient(120deg, #0f4f77, #0c8f83);
  color: #fff;
  border-radius: 14px;
  padding: 20px;
  box-shadow: var(--shadow);
}

.topbar h1 { margin: 0 0 8px; font-size: 28px; }
.topbar p { margin: 0; opacity: 0.95; }

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 16px 0;
}

.nav a {
  text-decoration: none;
  color: var(--text);
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 10px 14px;
  font-weight: 600;
}

.nav a.active {
  background: #d6f2ef;
  border-color: #a7ddd7;
  color: #065c55;
}

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

.cards-3 {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.cards-2 {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 16px;
  box-shadow: var(--shadow);
}

.card-link {
  color: inherit;
  text-decoration: none;
  transition: transform 120ms ease;
}

.card-link:hover {
  transform: translateY(-2px);
}

h2 { margin-top: 0; }

.form-grid,
.filter-grid {
  display: grid;
  gap: 12px;
}

label {
  display: grid;
  gap: 6px;
  font-weight: 600;
}

input, select, button {
  font: inherit;
}

input, select {
  border: 1px solid #b7c6d6;
  border-radius: 10px;
  padding: 10px 12px;
  background: #fff;
}

.actions {
  display: flex;
  gap: 10px;
  margin-top: 4px;
}

.actions.compact {
  align-items: center;
}

button {
  border: none;
  border-radius: 10px;
  padding: 10px 14px;
  background: var(--accent);
  color: #fff;
  font-weight: 700;
  cursor: pointer;
}

button:hover { background: var(--accent-dark); }
button:disabled { opacity: 0.5; cursor: not-allowed; }

.btn-secondary { background: #5e7387; }
.btn-secondary:hover { background: #4d6274; }

.btn-danger { background: var(--danger); }
.btn-danger:hover { background: #a92525; }

.feedback {
  margin-top: 12px;
  padding: 10px 12px;
  border-radius: 10px;
  background: #eef4fb;
  color: #20425f;
}

.feedback.success {
  background: #e5f7ef;
  color: #0f6f43;
}

.feedback.error {
  background: #fde9e9;
  color: #992222;
}

.pill {
  display: inline-block;
  border-radius: 999px;
  background: #e8edf3;
  color: #35536d;
  padding: 6px 10px;
  font-size: 13px;
  font-weight: 700;
}

.pill.success {
  background: #dff7ef;
  color: #0c6d49;
}

.uid-box {
  border: 2px dashed #9fb2c7;
  border-radius: 12px;
  padding: 16px;
  font-size: 24px;
  font-weight: 800;
  letter-spacing: 1px;
  text-align: center;
  background: #f8fbff;
}

.data-table,
.list-table {
  width: 100%;
  border-collapse: collapse;
}

.data-table th,
.data-table td,
.list-table th,
.list-table td {
  border-bottom: 1px solid var(--line);
  text-align: left;
  padding: 10px;
}

.data-table th { width: 210px; color: #3c5d77; }

.table-wrap {
  overflow-x: auto;
}

.muted {
  color: var(--muted);
}

.span-2 {
  grid-column: span 2;
}

code {
  background: #e9f1fb;
  padding: 1px 6px;
  border-radius: 6px;
}

@media (max-width: 900px) {
  .cards-3,
  .cards-2 {
    grid-template-columns: 1fr;
  }

  .span-2 {
    grid-column: span 1;
  }
}