:root {
    --bg: #f5f6f8;
    --card: #ffffff;
    --text: #1d2733;
    --muted: #667085;
    --line: #d9dee7;
    --primary: #1f6feb;
    --primary-dark: #174ea6;
    --danger: #c62828;
    --ok: #1b7f3a;
    --warn: #a76200;
}

* { box-sizing: border-box; }

body {
    margin: 0;
    font-family: Arial, Helvetica, sans-serif;
    background: var(--bg);
    color: var(--text);
}

a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }

.topbar {
    background: #111827;
    color: white;
    padding: 14px 24px;
    display: flex;
    align-items: center;
    gap: 28px;
    flex-wrap: wrap;
}

.brand a {
    color: white;
    font-weight: 700;
    font-size: 18px;
}

.nav {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.nav a {
    color: #dbe4f0;
    padding: 8px 10px;
    border-radius: 8px;
}

.nav a.active,
.nav a:hover {
    background: #263244;
    color: white;
    text-decoration: none;
}

.container {
    max-width: 1320px;
    margin: 24px auto;
    padding: 0 18px;
}

.footer {
    text-align: center;
    color: var(--muted);
    padding: 30px;
}

.card {
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: 14px;
    padding: 18px;
    margin-bottom: 18px;
    box-shadow: 0 1px 2px rgba(16, 24, 40, 0.04);
}

.grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(160px, 1fr));
    gap: 14px;
}

.grid-2 {
    display: grid;
    grid-template-columns: repeat(2, minmax(160px, 1fr));
    gap: 14px;
}

.stat {
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: 14px;
    padding: 16px;
}

.stat .label {
    color: var(--muted);
    font-size: 13px;
}

.stat .value {
    font-size: 26px;
    font-weight: 700;
    margin-top: 6px;
}

h1, h2, h3 { margin-top: 0; }

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

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

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

th {
    background: #f0f3f8;
    font-size: 13px;
    color: #344054;
}

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

.btn {
    display: inline-block;
    border: 1px solid var(--primary);
    background: var(--primary);
    color: white;
    padding: 8px 12px;
    border-radius: 9px;
    font-weight: 600;
    cursor: pointer;
    font-size: 14px;
}

.btn:hover {
    background: var(--primary-dark);
    text-decoration: none;
}

.btn.secondary {
    color: var(--primary);
    background: white;
}

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

.btn.small {
    padding: 5px 8px;
    font-size: 12px;
}

form .row {
    display: grid;
    grid-template-columns: repeat(4, minmax(160px, 1fr));
    gap: 12px;
    margin-bottom: 12px;
}

label {
    display: block;
    font-size: 13px;
    font-weight: 700;
    color: #344054;
    margin-bottom: 5px;
}

input, select, textarea {
    width: 100%;
    border: 1px solid var(--line);
    border-radius: 9px;
    padding: 9px 10px;
    background: white;
    color: var(--text);
}

textarea { min-height: 82px; }

.alert {
    padding: 12px 14px;
    border-radius: 10px;
    margin-bottom: 16px;
    border: 1px solid var(--line);
    background: white;
}

.alert.success { border-color: #badbcc; background: #eaf7ef; color: #0f5132; }
.alert.error { border-color: #f5c2c7; background: #f8d7da; color: #842029; }

.badge {
    display: inline-block;
    padding: 4px 7px;
    border-radius: 999px;
    font-size: 12px;
    font-weight: 700;
    background: #eef2ff;
    color: #3730a3;
}

.badge.ok { background: #e6f4ea; color: var(--ok); }
.badge.warn { background: #fff4de; color: var(--warn); }
.badge.danger { background: #fdeaea; color: var(--danger); }

.filters {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    align-items: end;
}

.filters > div {
    min-width: 180px;
}

.login-box {
    max-width: 420px;
    margin: 70px auto;
}

@media (max-width: 900px) {
    .grid, .grid-2, form .row {
        grid-template-columns: 1fr;
    }
    .topbar {
        align-items: flex-start;
    }
}