:root {
    --bg: #f4f7fb;
    --card: #fff;
    --text: #121519;
    --muted: #6b7480;
    --border: #dfe5ee;
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --danger: #dc2626;
    --ok-bg: #dcfce7;
    --ok-text: #166534;
    --down-bg: #fee2e2;
    --down-text: #991b1b;
    --unknown-bg: #e5e7eb;
    --unknown-text: #374151;
}

* { box-sizing: border-box; }

body {
    margin: 0;
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    color: var(--text);
    background: var(--bg);
}

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

.layout { min-height: 100vh; }

.topbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    min-height: 64px;
    padding: 0 28px;
    background: #111827;
    color: #fff;
}

.brand {
    color: #fff;
    font-weight: 700;
    font-size: 18px;
}

.nav {
    display: flex;
    gap: 18px;
}

.nav a { color: #dbeafe; }

.content {
    max-width: 1180px;
    margin: 0 auto;
    padding: 28px;
}

h1 {
    margin: 0 0 20px;
    font-size: 28px;
}

.card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 14px;
    box-shadow: 0 6px 20px rgba(15, 23, 42, .06);
}

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

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

th, td {
    padding: 14px 16px;
    border-bottom: 1px solid var(--border);
    vertical-align: top;
    text-align: left;
}

th {
    font-size: 12px;
    color: var(--muted);
    text-transform: uppercase;
    letter-spacing: .04em;
    background: #f8fafc;
}

tr:last-child td { border-bottom: 0; }

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

.url {
    margin-top: 4px;
    max-width: 420px;
    overflow-wrap: anywhere;
}

.error-small {
    margin-top: 6px;
    color: var(--danger);
    font-size: 12px;
    max-width: 520px;
    overflow-wrap: anywhere;
}

.status {
    display: inline-flex;
    align-items: center;
    border-radius: 999px;
    padding: 4px 10px;
    font-size: 12px;
    font-weight: 700;
}

.status--up { background: var(--ok-bg); color: var(--ok-text); }
.status--down { background: var(--down-bg); color: var(--down-text); }
.status--unknown { background: var(--unknown-bg); color: var(--unknown-text); }

.toolbar {
    display: flex;
    gap: 10px;
    align-items: center;
    margin-bottom: 16px;
}

.actions {
    display: flex;
    gap: 8px;
    align-items: center;
    white-space: nowrap;
}

.inline-form {
    display: inline;
    margin: 0;
}

.button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 38px;
    padding: 0 14px;
    border: 1px solid var(--border);
    border-radius: 10px;
    background: #fff;
    color: var(--text);
    font: inherit;
    cursor: pointer;
    text-decoration: none;
}

.button:hover { text-decoration: none; background: #f8fafc; }

.button--primary {
    border-color: var(--primary);
    background: var(--primary);
    color: #fff;
}

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

.button--danger {
    border-color: var(--danger);
    color: #fff;
    background: var(--danger);
    margin-left: auto;
}

.button--small {
    min-height: 32px;
    padding: 0 10px;
    border-radius: 8px;
    font-size: 13px;
}

.form {
    padding: 20px;
    display: grid;
    gap: 18px;
}

.form--login {
    max-width: 420px;
}

label {
    display: grid;
    gap: 7px;
    font-weight: 600;
}

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

input[type="text"],
input[type="url"],
input[type="password"],
input[type="number"] {
    width: 100%;
    min-height: 42px;
    padding: 8px 11px;
    border: 1px solid var(--border);
    border-radius: 10px;
    font: inherit;
}

.checkbox {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 500;
}

.checkbox span { color: var(--text); }

.grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
}

.grid--3 {
    grid-template-columns: repeat(3, minmax(0, 1fr));
}

.form-actions {
    display: flex;
    gap: 10px;
    align-items: center;
}

.flash {
    padding: 12px 14px;
    margin-bottom: 16px;
    border-radius: 10px;
    border: 1px solid var(--border);
    background: #eff6ff;
    color: #1e3a8a;
}

.flash--error {
    background: #fef2f2;
    color: #991b1b;
    border-color: #fecaca;
}

.empty {
    color: var(--muted);
    text-align: center;
    padding: 32px;
}

@media (max-width: 800px) {
    .topbar,
    .toolbar,
    .form-actions,
    .actions {
        align-items: flex-start;
        flex-direction: column;
    }

    .grid,
    .grid--3 {
        grid-template-columns: 1fr;
    }

    .content {
        padding: 18px;
    }
}