:root {
    --bg: #f5f6f8;
    --panel: #ffffff;
    --text: #1f2933;
    --muted: #687385;
    --line: #d9dee7;
    --primary: #146c94;
    --primary-dark: #0f5575;
    --danger: #b42318;
    --success: #12715b;
}

* {
    box-sizing: border-box;
}

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

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

.sidebar {
    position: fixed;
    inset: 0 auto 0 0;
    width: 230px;
    background: #1f2933;
    color: #fff;
    padding: 22px 16px;
}

.brand {
    font-size: 22px;
    font-weight: 700;
    margin-bottom: 28px;
}

.sidebar a {
    display: block;
    color: #e8edf4;
    padding: 11px 12px;
    border-radius: 6px;
    margin-bottom: 4px;
}

.sidebar a:hover {
    background: #344150;
}

.main {
    margin-left: 230px;
    padding: 28px;
}

.auth-main {
    min-height: 100vh;
    display: grid;
    place-items: center;
    padding: 20px;
}

.page-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    margin-bottom: 18px;
}

h1 {
    margin: 0 0 14px;
    font-size: 28px;
}

.panel, .card, .login-box {
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: 8px;
    padding: 18px;
}

.login-box {
    width: min(420px, 100%);
}

.grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 14px;
    margin-bottom: 18px;
}

.stat {
    font-size: 30px;
    font-weight: 700;
}

.muted {
    color: var(--muted);
}

form {
    display: grid;
    gap: 12px;
}

.form-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
}

label {
    display: grid;
    gap: 6px;
    font-weight: 600;
}

input, select, textarea, button {
    font: inherit;
}

input, select, textarea {
    width: 100%;
    border: 1px solid var(--line);
    border-radius: 6px;
    padding: 10px 11px;
    background: #fff;
}

textarea {
    min-height: 110px;
    resize: vertical;
}

.full {
    grid-column: 1 / -1;
}

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

.btn, button {
    border: 0;
    border-radius: 6px;
    padding: 10px 14px;
    background: var(--primary);
    color: #fff;
    cursor: pointer;
    display: inline-block;
}

.btn:hover, button:hover {
    background: var(--primary-dark);
}

.btn.secondary {
    background: #596579;
}

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

table {
    width: 100%;
    border-collapse: collapse;
    background: #fff;
    border: 1px solid var(--line);
}

th, td {
    padding: 11px;
    border-bottom: 1px solid var(--line);
    text-align: left;
    vertical-align: top;
}

th {
    background: #eef2f6;
}

.alert {
    padding: 12px 14px;
    border-radius: 6px;
    margin-bottom: 14px;
    background: #e8f4ff;
}

.alert.success {
    background: #dcfce7;
    color: var(--success);
}

.alert.error {
    background: #fee4e2;
    color: var(--danger);
}

.preview {
    width: 100%;
    min-height: 520px;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: #fff;
}

.preview-img {
    max-width: 100%;
    max-height: 720px;
    border: 1px solid var(--line);
    border-radius: 8px;
}

.footer {
    margin-top: 28px;
    color: var(--muted);
    font-size: 13px;
}

@media (max-width: 860px) {
    .sidebar {
        position: static;
        width: auto;
    }

    .main {
        margin-left: 0;
        padding: 18px;
    }

    .grid, .form-grid {
        grid-template-columns: 1fr;
    }

    .page-head {
        align-items: flex-start;
        flex-direction: column;
    }
}