:root {
  --primary: #2563eb;
  --bg: #f5f7fa;
  --card: #ffffff;
  --border: #e2e8f0;
  --text: #1e293b;
  --muted: #64748b;
  --danger: #dc2626;
  --success: #16a34a;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: -apple-system, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
}
#app { display: flex; min-height: 100vh; }
.sidebar {
  width: 220px;
  background: #111827;
  color: #e5e7eb;
  padding: 16px 0;
  flex-shrink: 0;
}
.sidebar h1 { font-size: 16px; padding: 0 20px; margin-bottom: 20px; }
.sidebar nav a {
  display: block;
  padding: 10px 20px;
  color: #cbd5e1;
  text-decoration: none;
  cursor: pointer;
  font-size: 14px;
}
.sidebar nav a.active, .sidebar nav a:hover { background: #1f2937; color: #fff; }
.main { flex: 1; padding: 24px; overflow: auto; }
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 20px;
  margin-bottom: 16px;
}
table { width: 100%; border-collapse: collapse; font-size: 13px; }
th, td { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--border); }
th { color: var(--muted); font-weight: 500; }
button {
  background: var(--primary);
  color: #fff;
  border: none;
  padding: 6px 14px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 13px;
}
button.secondary { background: #64748b; }
button.danger { background: var(--danger); }
button:hover { opacity: .9; }
input, select {
  padding: 6px 10px;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 13px;
  margin-right: 8px;
}
.login-wrap {
  display: flex; align-items: center; justify-content: center; height: 100vh; width: 100%;
}
.login-box {
  background: #fff; padding: 32px; border-radius: 10px; width: 320px; box-shadow: 0 4px 20px rgba(0,0,0,.08);
}
.login-box h2 { margin-top: 0; }
.login-box input { width: 100%; margin: 8px 0; padding: 10px; }
.login-box button { width: 100%; padding: 10px; margin-top: 8px; }
.toast {
  position: fixed; top: 16px; right: 16px; padding: 10px 16px; border-radius: 6px;
  background: #111827; color: #fff; font-size: 13px; z-index: 999;
}
.toast.error { background: var(--danger); }
.toast.success { background: var(--success); }
.tag { padding: 2px 8px; border-radius: 999px; font-size: 12px; background: #e2e8f0; }
.tag.issued { background: #dcfce7; color: #166534; }
.tag.pending { background: #fef9c3; color: #854d0e; }
.tag.failed { background: #fee2e2; color: #991b1b; }