body {
    margin: 0;
    font-family: Arial, sans-serif;
    background: #f5f7fb;
    color: #1f2937;
}
.layout {
    display: flex;
    min-height: 100vh;
}
.sidebar {
    width: 240px;
    background: #111827;
    color: #fff;
    padding: 24px 16px;
}
.sidebar h2 { margin-top: 0; font-size: 22px; }
.sidebar nav a {
    display: block;
    color: #d1d5db;
    text-decoration: none;
    padding: 10px 12px;
    border-radius: 8px;
    margin-bottom: 8px;
}
.sidebar nav a:hover { background: #1f2937; color: #fff; }
.content { flex: 1; padding: 24px; }
.topbar {
    display: flex;
    justify-content: flex-end;
    margin-bottom: 20px;
}
.cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 16px;
    margin-bottom: 24px;
}
.card {
    background: #fff;
    padding: 18px;
    border-radius: 14px;
    box-shadow: 0 2px 10px rgba(0,0,0,.06);
}
.card h3 { margin: 0 0 8px; font-size: 16px; color: #6b7280; }
.card .value { font-size: 28px; font-weight: 700; }
.table-wrap, .form-wrap {
    background: #fff;
    padding: 18px;
    border-radius: 14px;
    box-shadow: 0 2px 10px rgba(0,0,0,.06);
    margin-bottom: 20px;
}
table { width: 100%; border-collapse: collapse; }
th, td { padding: 12px; border-bottom: 1px solid #e5e7eb; text-align: left; }
input, select, textarea, button {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid #d1d5db;
    border-radius: 8px;
    box-sizing: border-box;
}
label { display: block; margin-bottom: 6px; font-weight: 600; }
.row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 14px;
    margin-bottom: 14px;
}
button, .btn {
    background: #2563eb;
    color: #fff;
    border: none;
    cursor: pointer;
    text-decoration: none;
    display: inline-block;
    width: auto;
}
button:hover, .btn:hover { background: #1d4ed8; }
.actions { margin-bottom: 14px; }
.alert {
    padding: 12px 14px;
    border-radius: 10px;
    margin-bottom: 14px;
}
.alert-success { background: #dcfce7; color: #166534; }
.alert-error { background: #fee2e2; color: #991b1b; }
.login-box {
    max-width: 400px;
    margin: 80px auto;
    background: #fff;
    padding: 24px;
    border-radius: 16px;
    box-shadow: 0 2px 10px rgba(0,0,0,.08);
}