:root {
    --bg: #f5f6fa;
    --card: #ffffff;
    --text: #1f2937;
    --muted: #64748b;
    --primary: #2563eb;
    --ok: #15803d;
    --warn: #d97706;
    --danger: #dc2626;
    --border: #e5e7eb;
}

* { box-sizing: border-box; }

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

nav {
    background: #111827;
    padding: 14px 24px;
    display: flex;
    gap: 18px;
    align-items: center;
    flex-wrap: wrap;
}

nav .brand {
    color: #fff;
    font-weight: bold;
    margin-left: 20px;
}

nav a {
    color: white;
    text-decoration: none;
    font-size: 14px;
}

main {
    padding: 24px;
}

h1, h2 {
    margin-top: 0;
}

.cards {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 14px;
    margin-bottom: 22px;
}

.card {
    background: var(--card);
    padding: 16px;
    border-radius: 12px;
    margin-bottom: 18px;
    box-shadow: 0 1px 4px rgba(0,0,0,0.08);
    border: 1px solid var(--border);
}

.stat span {
    color: var(--muted);
    display: block;
    margin-bottom: 8px;
}

.stat strong {
    font-size: 28px;
}

.form-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(120px, 1fr));
    gap: 8px;
    align-items: center;
}

input, select, button, textarea {
    padding: 10px;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-family: inherit;
}

textarea {
    width: 100%;
    min-height: 120px;
    margin-top: 8px;
}

button {
    cursor: pointer;
    background: var(--primary);
    color: white;
    border: none;
    font-weight: bold;
}

table {
    width: 100%;
    border-collapse: collapse;
    background: white;
    margin-bottom: 22px;
    border-radius: 12px;
    overflow: hidden;
}

th, td {
    padding: 11px;
    border-bottom: 1px solid var(--border);
    text-align: right;
    font-size: 14px;
}

th {
    background: #eef2ff;
}

.ok { color: var(--ok); font-weight: bold; }
.warn { color: var(--warn); font-weight: bold; }
.danger { color: var(--danger); font-weight: bold; }

.alert {
    padding: 12px;
    border-radius: 10px;
    margin-bottom: 8px;
    background: #fff7ed;
}

.alert.danger { background: #fef2f2; }
.alert.warn { background: #fff7ed; }

@media (max-width: 800px) {
    .cards { grid-template-columns: 1fr; }
    .form-grid { grid-template-columns: 1fr; }
    main { padding: 12px; }
    table { font-size: 12px; }
}