:root {
    color-scheme: light;
    --bg: #f4f7fb;
    --card: #ffffff;
    --text: #152033;
    --muted: #64748b;
    --line: #d7e0ec;
    --primary: #1d4ed8;
    --danger: #b91c1c;
    --ok: #15803d;
    font-family: "Segoe UI", "Microsoft YaHei", sans-serif;
}

* { box-sizing: border-box; }

body {
    margin: 0;
    background: var(--bg);
    color: var(--text);
}

.login-body {
    min-height: 100vh;
    display: grid;
    place-items: center;
    padding: 24px;
    background:
        radial-gradient(circle at 20% 20%, rgba(29, 78, 216, 0.12), transparent 24rem),
        linear-gradient(160deg, #eef4ff, #f8fbff);
}

.login-card {
    width: min(420px, 100%);
    padding: 28px;
    border-radius: 16px;
    background: var(--card);
    box-shadow: 0 18px 40px rgba(15, 23, 42, 0.1);
}

.login-card h1 { margin: 0 0 6px; font-size: 22px; }
.login-card p { margin: 0 0 16px; color: var(--muted); }

.topbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding: 14px 20px;
    background: #0f172a;
    color: #fff;
}

.topbar .muted { color: #94a3b8; margin-left: 10px; font-size: 13px; }
.tabs { display: flex; gap: 8px; flex-wrap: wrap; }
.tabs button {
    border: 0;
    background: transparent;
    color: #cbd5e1;
    padding: 8px 12px;
    border-radius: 8px;
    cursor: pointer;
}
.tabs button.active, .tabs button:hover { background: rgba(255,255,255,0.1); color: #fff; }
.logout { color: #93c5fd; text-decoration: none; }
.topbar-actions { display: flex; align-items: center; gap: 12px; }
.topbar-link {
    border: 0;
    background: transparent;
    color: #93c5fd;
    padding: 8px 4px;
    cursor: pointer;
}
.topbar-link:hover { color: #fff; }

main { padding: 20px; max-width: 1200px; margin: 0 auto; }
.panel {
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: 14px;
    padding: 18px;
}
.panel.hidden { display: none; }
.panel h2 { margin: 0 0 8px; }
.muted { color: var(--muted); font-size: 13px; }

.stack, .grid-form { display: grid; gap: 12px; }
.grid-form {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    margin-top: 12px;
}
.grid-form .full { grid-column: 1 / -1; }
label { display: grid; gap: 6px; font-size: 13px; color: var(--muted); }
label.checkbox-row {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--text);
    font-size: 14px;
    line-height: 1.4;
    cursor: pointer;
    user-select: none;
}
label.checkbox-row input[type="checkbox"] {
    width: 16px;
    height: 16px;
    margin: 0;
    flex: 0 0 16px;
    accent-color: var(--primary);
    cursor: pointer;
}
label.checkbox-row span {
    color: var(--text);
}
table input[type="checkbox"] {
    width: 16px;
    height: 16px;
    margin: 0;
    accent-color: var(--primary);
    cursor: pointer;
}
input, textarea, select, button {
    font: inherit;
}
input, textarea, select {
    width: 100%;
    border: 1px solid var(--line);
    border-radius: 8px;
    padding: 10px 12px;
    background: #fff;
    color: var(--text);
}
button {
    border: 0;
    border-radius: 8px;
    padding: 10px 14px;
    background: var(--primary);
    color: #fff;
    cursor: pointer;
}
button.secondary {
    background: #334155;
}
button:disabled { opacity: 0.6; cursor: not-allowed; }
.actions { display: flex; gap: 10px; flex-wrap: wrap; margin: 14px 0; }
.toolbar { display: flex; gap: 10px; margin-bottom: 12px; flex-wrap: wrap; }
.toolbar input { max-width: 320px; }

.table-wrap { overflow: auto; border: 1px solid var(--line); border-radius: 10px; }
table { width: 100%; border-collapse: collapse; font-size: 13px; }
th, td { padding: 8px 10px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
th { background: #f8fafc; }

.message {
    margin-bottom: 14px;
    padding: 10px 12px;
    border-radius: 10px;
    border: 1px solid var(--line);
    background: #fff;
}
.message.hint { color: var(--muted); }
.message.error { color: var(--danger); background: #fef2f2; border-color: #fecaca; }
.message.success { color: var(--ok); background: #f0fdf4; border-color: #bbf7d0; }

.log {
    background: #0f172a;
    color: #e2e8f0;
    padding: 12px;
    border-radius: 10px;
    min-height: 120px;
    overflow: auto;
    font-size: 12px;
}

.metric-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 12px;
    margin: 14px 0;
}
.metric-card {
    border: 1px solid var(--line);
    border-radius: 12px;
    padding: 14px;
    background: #f8fafc;
}
.metric-card .label { color: var(--muted); font-size: 12px; }
.metric-card .value { font-size: 26px; font-weight: 650; margin: 6px 0 4px; }
.metric-card .sub { color: var(--muted); font-size: 12px; word-break: break-all; }
.metric-card.ok { border-color: #bbf7d0; background: #f0fdf4; }
.metric-card.warn { border-color: #fde68a; background: #fffbeb; }
.metric-card.crit { border-color: #fecaca; background: #fef2f2; }
.badge {
    display: inline-block;
    padding: 2px 8px;
    border-radius: 999px;
    font-size: 12px;
    font-weight: 600;
}
.badge.ok { background: #dcfce7; color: #15803d; }
.badge.warn { background: #fef3c7; color: #b45309; }
.badge.crit { background: #fee2e2; color: #b91c1c; }
.chart-card {
    border: 1px solid var(--line);
    border-radius: 12px;
    padding: 12px;
    margin: 0 0 18px;
    background: #0f172a;
}
.chart-legend {
    color: #cbd5e1;
    font-size: 12px;
    display: flex;
    gap: 12px;
    align-items: center;
    margin-bottom: 8px;
}
.swatch {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    display: inline-block;
    margin-right: 4px;
}
.swatch.cpu { background: #60a5fa; }
.swatch.mem { background: #34d399; }
.swatch.disk { background: #fbbf24; }
.swatch.swap { background: #c084fc; }
.chart { width: 100%; height: 140px; display: block; }
.panel h3 { margin: 18px 0 8px; font-size: 16px; }

@media (max-width: 800px) {
    .grid-form { grid-template-columns: 1fr; }
    .topbar { flex-direction: column; align-items: flex-start; }
    .metric-grid { grid-template-columns: 1fr 1fr; }
}