:root {
    --bg: #f3f4f6;
    --bg-card: #ffffff;
    --bg-header: #ffffff;
    --border: #e2e5ea;
    --text: #2b2f38;
    --text-dim: #8a919e;
    --text-muted: #b0b6c0;
    --accent: #2f7dea;
    --accent-hover: #2569c7;
    --accent-bg: #eaf2fe;
    --up: #1fa855;
    --up-bg: #e7f8ee;
    --down: #e03e3e;
    --down-bg: #fdecec;
    --unknown: #9aa1ac;
    --unknown-bg: #eef0f3;
    --warn: #d68a10;
    --warn-bg: #fdf3e2;
    --shadow: 0 1px 3px rgba(20, 25, 35, 0.06), 0 1px 2px rgba(20, 25, 35, 0.04);
    --shadow-hover: 0 4px 12px rgba(20, 25, 35, 0.08), 0 2px 4px rgba(20, 25, 35, 0.05);
    --radius: 8px;
}

* { box-sizing: border-box; }

body {
    margin: 0;
    background: var(--bg);
    color: var(--text);
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    font-size: 14px;
}

/* ===== Topbar ===== */
.topbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 28px;
    background: var(--bg-header);
    border-bottom: 1px solid var(--border);
    flex-wrap: wrap;
    gap: 12px;
    position: sticky;
    top: 0;
    z-index: 10;
}
.topbar h1 {
    margin: 0;
    font-size: 15px;
    font-weight: 700;
    color: var(--text);
    letter-spacing: -0.2px;
}
.topbar h1 .accent-slashes { color: var(--accent); }
.topbar-stats { display: flex; align-items: center; gap: 14px; flex-wrap: wrap; }

.summary-badge {
    font-size: 13px;
    font-weight: 600;
    color: var(--text);
    background: var(--accent-bg);
    padding: 6px 14px;
    border-radius: 20px;
}
.summary-badge #summary-up { color: var(--up); }
.last-update { font-size: 12px; color: var(--text-muted); }

.btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: var(--accent);
    color: #fff;
    text-decoration: none;
    padding: 8px 16px;
    border-radius: 6px;
    font-weight: 600;
    font-size: 13px;
    border: none;
    cursor: pointer;
    transition: background .15s;
}
.btn:hover { background: var(--accent-hover); }
.btn-ghost { background: #fff; color: var(--text-dim); border: 1px solid var(--border); }
.btn-ghost:hover { color: var(--text); border-color: var(--accent); background: var(--accent-bg); }

/* ===== Grid / cards ===== */
.grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 14px;
}

.empty-state {
    grid-column: 1 / -1;
    text-align: center;
    padding: 60px 20px;
    color: var(--text-dim);
}

.node-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 12px 14px;
    box-shadow: var(--shadow);
    transition: box-shadow .15s, transform .1s;
    cursor: pointer;
    text-decoration: none;
    color: inherit;
    display: block;
}
.node-card:hover { box-shadow: var(--shadow-hover); transform: translateY(-1px); }

.node-card-header { display: flex; align-items: center; gap: 8px; margin-bottom: 2px; }

.status-pill {
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: .3px;
    padding: 2px 8px;
    border-radius: 12px;
    flex-shrink: 0;
}
.status-up .status-pill { background: var(--up-bg); color: var(--up); }
.status-down .status-pill { background: var(--down-bg); color: var(--down); }
.status-unknown .status-pill { background: var(--unknown-bg); color: var(--unknown); }

.node-name { font-weight: 600; font-size: 14.5px; flex: 1; color: var(--text); }
.node-latency { font-size: 12.5px; color: var(--text-dim); font-variant-numeric: tabular-nums; font-family: 'SFMono-Regular', Consolas, monospace; }
.node-host { font-size: 12px; color: var(--text-muted); margin-bottom: 12px; font-family: 'SFMono-Regular', Consolas, monospace; }

.node-metrics { display: flex; flex-direction: column; gap: 8px; margin-bottom: 8px; }
.metric { display: flex; align-items: center; gap: 8px; }
.metric-label { width: 34px; font-size: 11.5px; color: var(--text-muted); font-weight: 600; }
.metric-bar { flex: 1; height: 6px; background: var(--bg); border-radius: 3px; overflow: hidden; }
.metric-fill { height: 100%; background: var(--accent); border-radius: 3px; transition: width .4s ease; }
.metric-fill.warn { background: var(--warn); }
.metric-fill.crit { background: var(--down); }
.metric-value { width: 44px; text-align: right; font-size: 12px; font-variant-numeric: tabular-nums; color: var(--text-dim); }
.metric-row { display: flex; justify-content: space-between; font-size: 12px; color: var(--text-dim); }
.metric-row b { color: var(--text); font-weight: 600; }
.ssh-error { font-size: 11.5px; color: var(--warn); margin-top: 4px; background: var(--warn-bg); padding: 3px 8px; border-radius: 4px; display: inline-block; }

.node-footer { font-size: 11px; color: var(--text-muted); margin-top: 10px; border-top: 1px solid var(--border); padding-top: 8px; }

/* ===== Install / login ===== */
.install-page {
    display: flex; align-items: center; justify-content: center;
    min-height: 100vh;
    background: var(--bg);
}
.install-box {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    box-shadow: var(--shadow-hover);
    padding: 36px;
    width: 100%;
    max-width: 380px;
}
.install-box h1 { color: var(--text); text-align: center; margin-bottom: 0; font-size: 20px; }
.install-box h1 .accent-slashes { color: var(--accent); }
.install-box .subtitle { text-align: center; color: var(--text-dim); margin-top: 4px; margin-bottom: 24px; font-size: 13px; }
.install-box form { display: flex; flex-direction: column; gap: 14px; }
.install-box label { display: flex; flex-direction: column; gap: 6px; font-size: 12.5px; color: var(--text-dim); font-weight: 600; }
.install-box input[type=text], .install-box input[type=password] {
    background: #fff; border: 1px solid var(--border); border-radius: 6px;
    padding: 10px 12px; color: var(--text); font-size: 14px;
}
.install-box input:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-bg); }
.checkbox-label { flex-direction: row !important; align-items: center; gap: 8px !important; }
.alert { padding: 10px 14px; border-radius: 6px; font-size: 13px; margin-bottom: 16px; }
.alert-err { background: var(--down-bg); color: #b02a2a; border: 1px solid #f4c6c6; }
.alert-ok { background: var(--up-bg); color: #157a3d; border: 1px solid #b8ecc9; }
.hint { font-size: 12px; color: var(--text-muted); text-align: center; }
.hint code { background: var(--bg); padding: 2px 6px; border-radius: 4px; }

/* ===== Admin ===== */
.admin-page { max-width: 960px; margin: 0 auto; padding: 24px; }
.admin-page h1 { font-size: 20px; }
.admin-page h2 { font-size: 16px; }
.admin-page table {
    width: 100%; border-collapse: collapse; margin-top: 16px;
    background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden;
    box-shadow: var(--shadow);
}
.admin-page th, .admin-page td { text-align: left; padding: 11px 14px; border-bottom: 1px solid var(--border); font-size: 13px; }
.admin-page th { color: var(--text-muted); font-weight: 600; font-size: 11.5px; text-transform: uppercase; letter-spacing: .3px; background: var(--bg); }
.admin-page tr:last-child td { border-bottom: none; }
.form-card { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow); padding: 20px; margin-top: 20px; }
.form-row { display: flex; gap: 12px; margin-bottom: 12px; flex-wrap: wrap; }
.form-row label { display: flex; flex-direction: column; gap: 4px; font-size: 12px; color: var(--text-dim); font-weight: 600; flex: 1; min-width: 160px; }
.form-row input, .form-row select, .form-row textarea { background: #fff; border: 1px solid var(--border); border-radius: 6px; padding: 8px 10px; color: var(--text); font-size: 13.5px; }
.form-row input:focus, .form-row select:focus, .form-row textarea:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-bg); }
.link-back { color: var(--accent); text-decoration: none; font-size: 13px; font-weight: 600; }
.link-back:hover { text-decoration: underline; }
.link-danger { color: var(--down); }
.table-scroll { overflow-x: auto; -webkit-overflow-scrolling: touch; }
.nowrap { white-space: nowrap; }

/* ===== Node detail page ===== */
.node-detail-page { max-width: 1100px; margin: 0 auto; padding: 24px; }
.node-detail-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 20px; flex-wrap: wrap; gap: 12px; }
.node-detail-title { display: flex; align-items: center; gap: 12px; }
.node-detail-title h1 { font-size: 20px; margin: 0; }
.stat-cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); gap: 12px; margin-bottom: 20px; }
.stat-card { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow); padding: 14px 16px; }
.stat-card .stat-label { font-size: 11px; color: var(--text-muted); font-weight: 600; text-transform: uppercase; letter-spacing: .3px; }
.stat-card .stat-value { font-size: 22px; font-weight: 700; color: var(--text); margin-top: 4px; }
.stat-card .stat-value.up { color: var(--up); }
.stat-card .stat-value.down { color: var(--down); }
.chart-card { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow); padding: 18px 20px; margin-bottom: 16px; }
.chart-card h3 { margin: 0 0 12px 0; font-size: 13.5px; color: var(--text-dim); font-weight: 600; }
.chart-tabs { display: flex; gap: 6px; margin-bottom: 16px; }
.chart-tab { background: #fff; border: 1px solid var(--border); border-radius: 6px; padding: 6px 14px; font-size: 12.5px; font-weight: 600; color: var(--text-dim); cursor: pointer; }
.chart-tab.active { background: var(--accent); color: #fff; border-color: var(--accent); }
/* КРИТИЧНО для Chart.js: canvas должен лежать в контейнере с ЯВНОЙ высотой,
   иначе responsive:true устраивает бесконечный цикл роста высоты */
.chart-canvas-wrap { position: relative; height: 280px; width: 100%; }
.chart-canvas-wrap canvas { position: absolute; top: 0; left: 0; width: 100% !important; height: 100% !important; }

/* ===== Проверки сайтов/сервисов (probes) ===== */
.probes-page { max-width: 1100px; margin: 0 auto; padding: 24px; }
.probe-table-wrap { overflow-x: auto; background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow); }
.probe-table { width: 100%; border-collapse: collapse; min-width: 480px; }
.probe-table th, .probe-table td { padding: 10px 14px; border-bottom: 1px solid var(--border); font-size: 13px; text-align: left; white-space: nowrap; }
.probe-table th { color: var(--text-muted); font-weight: 600; font-size: 11px; text-transform: uppercase; background: var(--bg); }
.probe-table tr:last-child td { border-bottom: none; }
.probe-target-name { font-weight: 600; }
.probe-target-host { font-size: 11.5px; color: var(--text-muted); font-family: 'SFMono-Regular', Consolas, monospace; }
.probe-cell { text-align: center !important; }
.probe-badge { display: inline-flex; align-items: center; gap: 5px; font-size: 12px; font-weight: 600; padding: 3px 10px; border-radius: 12px; cursor: pointer; text-decoration: none; }
.probe-badge.up { background: var(--up-bg); color: var(--up); }
.probe-badge.down { background: var(--down-bg); color: var(--down); }
.probe-badge.unknown { background: var(--unknown-bg); color: var(--unknown); }
.probe-badge .lat { font-weight: 400; opacity: .8; }

/* ===== PWA install button ===== */
.btn-install { display: none; }
.btn-install.visible { display: inline-flex; }
.btn-notify { display: none; }
.btn-notify.visible { display: inline-flex; }

/* ===== Двухколоночная раскладка дашборда ===== */
.dashboard-layout {
    display: grid;
    grid-template-columns: 1fr 320px;
    gap: 16px;
    align-items: start;
    max-width: 1560px;
    margin: 0 auto;
    padding: 20px 24px;
}
.dashboard-main { display: flex; flex-direction: column; gap: 16px; min-width: 0; }
.dashboard-sidebar { position: sticky; top: 66px; min-width: 0; }

/* ===== Блок дашборда (перетаскиваемый раздел) ===== */
.dash-block { background: transparent; }
.dash-block-header {
    display: flex; align-items: center; gap: 8px;
    padding: 6px 4px; margin-bottom: 8px;
    cursor: grab; user-select: none;
}
.dash-block-header:active { cursor: grabbing; }
.dash-block-header.dragging { opacity: .4; }
.dash-block.drag-over .dash-block-header { outline: 2px dashed var(--accent); outline-offset: 2px; border-radius: 6px; }
.drag-handle { color: var(--text-muted); font-size: 14px; letter-spacing: -1px; line-height: 1; }
.dash-block-title { font-size: 13px; font-weight: 700; text-transform: uppercase; letter-spacing: .4px; color: var(--text-muted); }
.dash-block-body { min-width: 0; }

/* ===== Сайты/сервисы (компактный список) ===== */
.sites-card { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow); overflow: hidden; }
.site-row { display: flex; align-items: center; gap: 10px; padding: 10px 16px; border-bottom: 1px solid var(--border); flex-wrap: wrap; }
.site-row:last-child { border-bottom: none; }
.site-row-name { font-weight: 600; font-size: 13.5px; min-width: 140px; flex: 1 1 140px; }
.site-row-name .host { display: block; font-weight: 400; font-size: 11.5px; color: var(--text-muted); font-family: 'SFMono-Regular', Consolas, monospace; }
.site-row-badges { display: flex; gap: 6px; flex-wrap: wrap; }

/* ===== Лента событий: вертикальный список справа, тот же фон что у карточек узлов ===== */
.dash-block-events .dash-block-header { cursor: default; }
.events-feed-wrap {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 6px;
    resize: vertical;
    overflow: hidden;
    min-height: 220px;
    max-height: 82vh;
    height: 560px;
}
.events-feed {
    display: flex; flex-direction: column; gap: 6px;
    height: 100%; overflow-y: auto; padding: 4px;
    scrollbar-width: thin; scrollbar-color: var(--border) transparent;
}
.events-feed::-webkit-scrollbar { width: 7px; }
.events-feed::-webkit-scrollbar-track { background: transparent; }
.events-feed::-webkit-scrollbar-thumb { background: var(--border); border-radius: 4px; }
.events-feed::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }

.event-card { background: var(--bg); border: 1px solid var(--border); border-radius: 8px; padding: 9px 11px; display: flex; gap: 8px; align-items: flex-start; }
.event-card.event-empty { color: var(--text-muted); font-size: 12.5px; justify-content: center; }
.event-icon { font-size: 15px; line-height: 1.3; flex-shrink: 0; }
.event-body { min-width: 0; flex: 1; }
.event-msg { font-size: 12.5px; font-weight: 600; line-height: 1.35; word-break: break-word; }
.event-meta { font-size: 10.5px; color: var(--text-muted); margin-top: 3px; display: flex; gap: 6px; align-items: center; }
.event-scope-pill { font-size: 9.5px; font-weight: 700; text-transform: uppercase; padding: 1px 5px; border-radius: 6px; background: var(--accent-bg); color: var(--accent); }


/* ===== Мобильная адаптация ===== */
@media (max-width: 640px) {
    .topbar { padding: 10px 14px; gap: 8px; }
    .topbar h1 { font-size: 15px; }
    .topbar-stats { gap: 8px; width: 100%; }
    .btn, .btn-ghost { font-size: 12px; padding: 7px 10px; }
    .summary-badge { font-size: 12px; padding: 5px 10px; }
    .last-update { display: none; } /* занимает место, не критично на телефоне */

    .dashboard-layout { grid-template-columns: 1fr; padding: 14px 12px; gap: 12px; }
    .dashboard-sidebar { position: static; order: 2; }
    .dashboard-main { order: 1; gap: 12px; }
    .grid { grid-template-columns: 1fr; gap: 10px; }
    .events-feed-wrap { height: 320px; max-height: 60vh; resize: none; }
    .drag-handle { display: none; }
    .dash-block-header { cursor: default; }

    .admin-page, .node-detail-page, .probes-page { padding: 14px; }
    .form-row { flex-direction: column; gap: 10px; }
    .form-row label { min-width: 0; }

    .stat-cards { grid-template-columns: repeat(2, 1fr); gap: 8px; }
    .stat-card { padding: 10px 12px; }
    .stat-card .stat-value { font-size: 18px; }

    .chart-canvas-wrap { height: 220px; }
    .chart-tabs { flex-wrap: wrap; }

    table { font-size: 12px; }
    .admin-page th, .admin-page td { padding: 8px 10px; }

    .site-row { padding: 9px 12px; }
    .site-row-name { min-width: 100%; }
}