:root {
    --bg: #f6f8fb;
    --card: #ffffff;
    --text: #1f2937;
    --muted: #6b7280;
    --primary: #2457c5;
    --danger: #c0392b;
    --border: #dbe3ef;
    --success-bg: #e8f7ee;
    --danger-bg: #fdecec;
}
* { box-sizing: border-box; }
body {
    margin: 0;
    font-family: Arial, Helvetica, sans-serif;
    background: var(--bg);
    color: var(--text);
}
.topbar {
    background: linear-gradient(135deg, #1f4fb8, #3b82f6);
    color: white;
    padding: 18px 16px;
}
.topbar h1 { margin: 0 0 4px; font-size: 1.4rem; }
.topbar p { margin: 0; opacity: 0.95; }
.nav {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    padding: 12px 16px;
    background: #fff;
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 10;
}
.nav a {
    text-decoration: none;
    color: var(--primary);
    background: #eef4ff;
    padding: 10px 12px;
    border-radius: 10px;
    font-weight: 600;
}
.container { padding: 16px; max-width: 1200px; margin: 0 auto; }
.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 14px;
}
.card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 16px;
    box-shadow: 0 4px 18px rgba(15, 23, 42, 0.05);
}
.card h2, .card h3 { margin-top: 0; }
.value { font-size: 1.6rem; font-weight: 700; }
.muted { color: var(--muted); }
form.inline, .filters {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    align-items: end;
}
label { display: block; font-weight: 600; margin-bottom: 6px; }
input, select, textarea, button {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--border);
    border-radius: 10px;
    font: inherit;
}
textarea { min-height: 90px; }
button, .btn {
    cursor: pointer;
    background: var(--primary);
    color: white;
    border: none;
    text-decoration: none;
    display: inline-block;
    width: auto;
}
.btn.secondary { background: #6b7280; }
.btn.danger, .danger { background: var(--danger); color: #fff; }
.table-wrap { overflow-x: auto; }
table {
    width: 100%;
    border-collapse: collapse;
    background: white;
    border-radius: 16px;
    overflow: hidden;
}
th, td {
    padding: 12px;
    border-bottom: 1px solid var(--border);
    text-align: left;
    vertical-align: top;
}
th { background: #eef4ff; }
.alert {
    margin-bottom: 16px;
    padding: 12px 14px;
    border-radius: 10px;
}
.alert.success { background: var(--success-bg); }
.alert.error { background: var(--danger-bg); }
.footer {
    text-align: center;
    color: var(--muted);
    padding: 24px 16px;
}
.actions {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}
.small { font-size: 0.9rem; }
@media (max-width: 640px) {
    .nav a { flex: 1 1 calc(50% - 8px); text-align: center; }
    .actions { flex-direction: column; }
}