:root {
  --bg: #f2f5f9;
  --surface: #ffffff;
  --text: #1f2937;
  --muted: #64748b;
  --primary: #1d4ed8;
  --primary-2: #3b82f6;
  --danger: #dc2626;
  --success: #059669;
  --border: #dbe4ef;
  --shadow: 0 12px 28px rgba(15, 23, 42, 0.08);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at 20% 0%, rgba(59, 130, 246, 0.15), transparent 40%),
    radial-gradient(circle at 80% 100%, rgba(29, 78, 216, 0.15), transparent 45%),
    var(--bg);
  min-height: 100vh;
}

.container {
  width: min(1080px, 92vw);
  margin: 0 auto;
  padding: 1.5rem 0 3rem;
}

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

.header {
  margin-bottom: 1.25rem;
  display: flex;
  gap: 0.75rem;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
}

h1, h2, h3 {
  margin: 0;
}

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

.nav {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.nav a,
.nav button {
  border: 1px solid var(--border);
  background: #fff;
  color: var(--text);
  border-radius: 10px;
  padding: 0.55rem 0.8rem;
  text-decoration: none;
  cursor: pointer;
  font-size: 0.92rem;
}

.nav a.active,
.nav a:hover,
.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--primary-2));
  color: #fff;
  border-color: transparent;
}

.btn {
  border: 1px solid var(--border);
  padding: 0.6rem 1rem;
  border-radius: 10px;
  cursor: pointer;
  background: #fff;
}

.btn-danger {
  background: var(--danger);
  color: #fff;
  border-color: transparent;
}

.grid {
  display: grid;
  gap: 1rem;
}

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

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

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

label {
  font-weight: 600;
  font-size: 0.92rem;
}

input,
select,
textarea {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 0.68rem 0.72rem;
  font-size: 0.95rem;
}

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

table {
  width: 100%;
  border-collapse: collapse;
  background: #fff;
}

th,
td {
  border-bottom: 1px solid var(--border);
  padding: 0.65rem;
  text-align: left;
  font-size: 0.92rem;
}

th {
  background: #f8fbff;
}

.badge {
  display: inline-block;
  border-radius: 99px;
  padding: 0.2rem 0.56rem;
  font-size: 0.78rem;
  background: #eaf2ff;
  color: #1e40af;
}

.message {
  margin-top: 0.8rem;
  padding: 0.7rem 0.8rem;
  border-radius: 10px;
  font-size: 0.9rem;
}

.message.error {
  background: #fee2e2;
  color: #991b1b;
}

.message.success {
  background: #dcfce7;
  color: #166534;
}

.hidden {
  display: none;
}

.auth-layout {
  width: min(460px, 94vw);
  margin: 4rem auto;
}

.stat {
  padding: 1rem;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: #fff;
}

.stat strong {
  display: block;
  font-size: 1.5rem;
}

pre {
  background: #0f172a;
  color: #e2e8f0;
  padding: 1rem;
  border-radius: 12px;
  overflow: auto;
  font-size: 0.84rem;
}

@media (max-width: 860px) {
  .grid-2,
  .grid-3 {
    grid-template-columns: 1fr;
  }
}