:root {
  --bg: #f8fafb;
  --card: #ffffff;
  --text: #1f2937;
  --muted: #6b7280;
  --primary: #2563eb;
  --danger: #dc2626;
  --border: #e5e7eb;
  --shadow: 0 6px 18px rgba(15, 23, 42, 0.08);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Noto Sans SC", "Source Han Sans SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
  background: var(--bg);
  color: var(--text);
}

header {
  background: var(--card);
  border-bottom: 1px solid var(--border);
  padding: 16px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 10;
}

header .title {
  font-size: 20px;
  font-weight: 600;
}

header .user {
  font-size: 14px;
  color: var(--muted);
}

nav {
  display: flex;
  gap: 12px;
}

nav a {
  text-decoration: none;
  color: var(--text);
  font-weight: 600;
  padding: 8px 12px;
  border-radius: 8px;
}

nav a.active {
  background: rgba(37, 99, 235, 0.12);
  color: var(--primary);
}

.container {
  max-width: 1200px;
  margin: 24px auto;
  padding: 0 24px 40px;
}

.card {
  background: var(--card);
  border-radius: 14px;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
  padding: 20px;
  margin-bottom: 20px;
}

.card h2 {
  margin: 0 0 12px;
  font-size: 18px;
}

.card-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 12px;
}

.card-head h2 {
  margin: 0;
}

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

.table th,
.table td {
  text-align: left;
  padding: 10px 8px;
  border-bottom: 1px solid var(--border);
  font-size: 14px;
}

.table tr:nth-child(even) td {
  background: #fbfbfd;
}

.table tr:hover td {
  background: #f3f4f6;
}

.table th {
  color: var(--muted);
  font-weight: 600;
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 12px;
}

label {
  font-size: 13px;
  color: var(--muted);
  display: block;
  margin-bottom: 6px;
}

input,
select,
textarea {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 8px 10px;
  font-size: 14px;
  background: #fff;
}

textarea {
  min-height: 70px;
}

.actions {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.actions form {
  margin: 0;
}

.button {
  border: none;
  border-radius: 8px;
  padding: 8px 14px;
  font-size: 14px;
  cursor: pointer;
  background: var(--primary);
  color: #fff;
}

.button.secondary {
  background: #e5e7eb;
  color: var(--text);
}

.button.danger {
  background: var(--danger);
}

.notice {
  color: var(--muted);
  font-size: 13px;
  margin-top: 8px;
}

.error {
  color: var(--danger);
  font-size: 13px;
  margin-top: 8px;
}

.inline {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.badge {
  background: rgba(37, 99, 235, 0.12);
  color: var(--primary);
  font-weight: 600;
  border-radius: 999px;
  padding: 4px 10px;
  font-size: 12px;
}

.login-wrapper {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  background: radial-gradient(circle at top, rgba(37, 99, 235, 0.18), transparent 55%),
    linear-gradient(135deg, #eef2ff 0%, #f8fafb 55%, #eff6ff 100%);
}

.login-card {
  width: 420px;
  border: 1px solid rgba(37, 99, 235, 0.25);
  box-shadow: 0 20px 40px rgba(15, 23, 42, 0.12);
}

.login-brand {
  font-size: 14px;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--primary);
  font-weight: 700;
}

.login-title {
  margin: 8px 0 6px;
  font-size: 22px;
  font-weight: 700;
}

.login-subtitle {
  margin: 0 0 16px;
  color: var(--muted);
  font-size: 13px;
}

.login-form {
  margin-top: 8px;
}

.login-footer {
  margin-top: 12px;
  font-size: 12px;
  color: var(--muted);
}

@media (max-width: 640px) {
  header {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
  }

  nav {
    flex-wrap: wrap;
  }
}