/* VPS Monitor — flat, dense ops dashboard. Colors are semantic tokens; dark is the default,
   light follows the system or the manual toggle. Status never relies on color alone (icon + text). */

:root {
  --bg: #0b1220;
  --surface: #111a2e;
  --surface-2: #18233a;
  --border: #2a3855;
  --text: #e6edf7;
  --muted: #9aabc4;
  --accent: #38bdf8;
  --on-accent: #06202e;
  --ok: #4ade80;
  --warn: #fbbf24;
  --crit: #f87171;
  --info: #38bdf8;
  --ok-bg: rgba(74, 222, 128, .12);
  --warn-bg: rgba(251, 191, 36, .12);
  --crit-bg: rgba(248, 113, 113, .14);
  --info-bg: rgba(56, 189, 248, .12);
  --c1: #38bdf8; --c2: #c4b5fd; --c3: #fbbf24; --c4: #4ade80; --c5: #f472b6; --c6: #fb923c;
  --grid: rgba(154, 171, 196, .16);
  --shadow: 0 1px 0 rgba(255, 255, 255, .03) inset;

  --font: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, "SF Mono", "Cascadia Mono", Menlo, Consolas, monospace;

  --s1: 4px; --s2: 8px; --s3: 12px; --s4: 16px; --s5: 24px; --s6: 32px;
  --radius: 10px;
  --nav-w: 216px;
  --dur: 150ms;
}

:root[data-theme="light"] {
  --bg: #f4f6fa; --surface: #ffffff; --surface-2: #eef2f8; --border: #d5dcea;
  --text: #0f172a; --muted: #475569; --accent: #0369a1; --on-accent: #ffffff;
  --ok: #15803d; --warn: #b45309; --crit: #b91c1c; --info: #0369a1;
  --ok-bg: #e6f4ea; --warn-bg: #fdf0dc; --crit-bg: #fde8e8; --info-bg: #e0f0fa;
  --c1: #0369a1; --c2: #6d28d9; --c3: #b45309; --c4: #15803d; --c5: #be185d; --c6: #c2410c;
  --grid: rgba(15, 23, 42, .10);
  --shadow: 0 1px 2px rgba(15, 23, 42, .06);
}

@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) {
    --bg: #f4f6fa; --surface: #ffffff; --surface-2: #eef2f8; --border: #d5dcea;
    --text: #0f172a; --muted: #475569; --accent: #0369a1; --on-accent: #ffffff;
    --ok: #15803d; --warn: #b45309; --crit: #b91c1c; --info: #0369a1;
    --ok-bg: #e6f4ea; --warn-bg: #fdf0dc; --crit-bg: #fde8e8; --info-bg: #e0f0fa;
    --c1: #0369a1; --c2: #6d28d9; --c3: #b45309; --c4: #15803d; --c5: #be185d; --c6: #c2410c;
    --grid: rgba(15, 23, 42, .10);
    --shadow: 0 1px 2px rgba(15, 23, 42, .06);
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--bg); color: var(--text);
  font: 14px/1.5 var(--font); min-height: 100dvh;
  font-variant-numeric: tabular-nums;
}
[hidden] { display: none !important; }
h1, h2, h3 { margin: 0; line-height: 1.25; }
h1 { font-size: 20px; font-weight: 650; }
h2 { font-size: 15px; font-weight: 650; }
h3 { font-size: 13px; font-weight: 600; }
p { margin: 0; }
a { color: var(--accent); }
.muted { color: var(--muted); }
.mono { font-family: var(--mono); font-size: .92em; }
.num { text-align: right; white-space: nowrap; }
.wrap-any { overflow-wrap: anywhere; }

:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 4px; }
#main:focus { outline: none; }

.skip-link {
  position: absolute; left: var(--s3); top: -48px; z-index: 100; padding: var(--s2) var(--s3);
  background: var(--accent); color: var(--on-accent); border-radius: 6px; text-decoration: none; font-weight: 600;
}
.skip-link:focus { top: var(--s3); }

.icon { width: 18px; height: 18px; flex: none; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }
.icon-sm { width: 14px; height: 14px; }

/* ---- buttons & inputs ---- */
.btn, .icon-btn, .seg button {
  font: inherit; color: var(--text); background: var(--surface); border: 1px solid var(--border);
  border-radius: 8px; cursor: pointer; display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  min-height: 34px; padding: 0 var(--s3); transition: background var(--dur), border-color var(--dur);
  touch-action: manipulation;
}
.icon-btn { width: 34px; padding: 0; }
.btn:hover, .icon-btn:hover, .seg button:hover { background: var(--surface-2); }
.btn.is-paused { background: var(--warn-bg); border-color: var(--warn); color: var(--warn); }
.btn-primary { background: var(--accent); color: var(--on-accent); border-color: var(--accent); font-weight: 650; min-height: 42px; }
.btn-primary:hover { background: var(--accent); filter: brightness(1.08); }
.btn:disabled { opacity: .55; cursor: not-allowed; }

.seg { display: inline-flex; border: 1px solid var(--border); border-radius: 8px; overflow: hidden; background: var(--surface); }
.seg button { border: 0; border-radius: 0; min-height: 32px; padding: 0 10px; background: transparent; }
.seg button + button { border-left: 1px solid var(--border); }
.seg button[aria-pressed="true"] { background: var(--accent); color: var(--on-accent); font-weight: 650; }

.field { display: grid; gap: 6px; margin-top: var(--s4); }
.field label { font-weight: 600; font-size: 13px; }
input[type="text"], input[type="password"], input[type="search"] {
  font: inherit; color: var(--text); background: var(--bg); border: 1px solid var(--border);
  border-radius: 8px; min-height: 42px; padding: 0 var(--s3); width: 100%;
}
input:focus-visible { outline: 2px solid var(--accent); outline-offset: 1px; }
.input-group { position: relative; display: flex; }
.input-group input { padding-right: 48px; }
.input-group .icon-btn { position: absolute; right: 4px; top: 4px; border: 0; background: transparent; height: 34px; }
.form-error { color: var(--crit); min-height: 22px; margin-top: var(--s3); font-weight: 500; }
.form-error:empty { min-height: 0; margin: 0; }

/* ---- login ---- */
.login { min-height: 100dvh; display: grid; place-items: center; padding: var(--s4); }
.login-card { width: min(400px, 100%); background: var(--surface); border: 1px solid var(--border); border-radius: 14px; padding: var(--s5); display: grid; box-shadow: var(--shadow); }
.login-card .btn-primary { margin-top: var(--s2); }
.login-title { margin-top: var(--s4); font-size: 22px; }
.brand { display: flex; align-items: center; gap: var(--s2); font-weight: 700; letter-spacing: .01em; }
.brand .icon { color: var(--accent); }
.brand-lg { font-size: 16px; }

/* ---- shell ---- */
.shell { display: grid; grid-template-columns: var(--nav-w) minmax(0, 1fr); min-height: 100dvh; }
.nav { position: sticky; top: 0; height: 100dvh; background: var(--surface); border-right: 1px solid var(--border); padding: var(--s4) var(--s3); display: flex; flex-direction: column; gap: var(--s5); }
.nav .brand { padding: 0 var(--s2); }
.nav-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 2px; }
.nav-list a {
  display: flex; align-items: center; gap: var(--s3); min-height: 40px; padding: 0 var(--s3); border-radius: 8px;
  color: var(--muted); text-decoration: none; font-weight: 550; transition: background var(--dur), color var(--dur);
}
.nav-list a:hover { background: var(--surface-2); color: var(--text); }
.nav-list a[aria-current="page"] { background: var(--info-bg); color: var(--text); box-shadow: inset 3px 0 0 var(--accent); }
.nav-list a[aria-current="page"] .icon { color: var(--accent); }
.nav-badge { margin-left: auto; min-width: 20px; height: 20px; padding: 0 6px; border-radius: 10px; font-size: 12px; font-weight: 700; display: inline-grid; place-items: center; background: var(--crit); color: #fff; }
.nav-badge.warn { background: var(--warn); color: #1a1202; }

.content { min-width: 0; display: flex; flex-direction: column; }
.topbar {
  position: sticky; top: 0; z-index: 20; display: flex; align-items: center; flex-wrap: wrap; gap: var(--s2) var(--s4);
  padding: var(--s3) var(--s5); background: var(--bg); border-bottom: 1px solid var(--border);
}
.topbar-id { min-width: 0; }
.host-name { font-weight: 700; font-size: 16px; }
.host-meta { font-size: 12px; }
.controls { margin-left: auto; display: flex; align-items: center; flex-wrap: wrap; gap: var(--s2); }
.updated { font-size: 12px; min-width: 84px; }
.pill { display: inline-flex; align-items: center; gap: 6px; padding: 4px 10px; border-radius: 999px; font-weight: 600; font-size: 13px; border: 1px solid transparent; }
.pill-ok { background: var(--ok-bg); color: var(--ok); }
.pill-warn { background: var(--warn-bg); color: var(--warn); }
.pill-crit { background: var(--crit-bg); color: var(--crit); }
.pill-muted { background: var(--surface-2); color: var(--muted); }

main { padding: var(--s5); display: grid; grid-template-columns: minmax(0, 1fr); gap: var(--s5); align-content: start; max-width: 1600px; width: 100%; }
.view-head { display: flex; align-items: baseline; justify-content: space-between; gap: var(--s3); flex-wrap: wrap; }
.view-head p { color: var(--muted); }
.section-title { display: flex; align-items: center; justify-content: space-between; gap: var(--s3); margin-bottom: var(--s3); flex-wrap: wrap; }

.banner { margin: var(--s3) var(--s5) 0; padding: var(--s2) var(--s3); border-radius: 8px; display: flex; gap: var(--s2); align-items: center; font-weight: 500; }
.banner-warn { background: var(--warn-bg); color: var(--warn); border: 1px solid var(--warn); }
.callout { padding: var(--s3) var(--s4); border-radius: var(--radius); border: 1px solid var(--border); background: var(--surface); display: flex; gap: var(--s3); align-items: flex-start; }
.callout .icon { margin-top: 2px; }
.callout-warn { border-color: var(--warn); background: var(--warn-bg); }
.callout-crit { border-color: var(--crit); background: var(--crit-bg); }
.callout-info { border-color: var(--info); background: var(--info-bg); }

/* ---- cards & tiles ---- */
.card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: var(--s4); box-shadow: var(--shadow); min-width: 0; }
.grid { display: grid; gap: var(--s4); }
.grid-kpi { grid-template-columns: repeat(auto-fit, minmax(210px, 1fr)); }
.grid-charts { grid-template-columns: repeat(auto-fit, minmax(min(100%, 440px), 1fr)); }
.grid-2 { grid-template-columns: repeat(auto-fit, minmax(min(100%, 480px), 1fr)); }

.tile { display: grid; gap: 6px; align-content: start; }
.tile-head { display: flex; align-items: center; justify-content: space-between; gap: var(--s2); color: var(--muted); font-weight: 600; font-size: 12px; text-transform: uppercase; letter-spacing: .04em; }
.tile-value { font-size: 28px; font-weight: 700; line-height: 1.1; letter-spacing: -.01em; }
.tile-value small { font-size: 14px; font-weight: 600; color: var(--muted); margin-left: 4px; }
.tile-sub { color: var(--muted); font-size: 12.5px; min-height: 19px; }
.tile.lv-warn { border-color: color-mix(in srgb, var(--warn) 55%, var(--border)); }
.tile.lv-crit { border-color: color-mix(in srgb, var(--crit) 65%, var(--border)); }

.meter { height: 6px; border-radius: 3px; background: var(--surface-2); overflow: hidden; }
.meter > span { display: block; height: 100%; border-radius: 3px; background: var(--ok); transition: width 400ms ease-out; }
.meter.lv-warn > span { background: var(--warn); }
.meter.lv-crit > span { background: var(--crit); }
.meter.lv-info > span { background: var(--accent); }

.badge { display: inline-flex; align-items: center; gap: 4px; padding: 1px 8px 1px 6px; border-radius: 999px; font-size: 12px; font-weight: 650; white-space: nowrap; }
.badge-ok { background: var(--ok-bg); color: var(--ok); }
.badge-warn { background: var(--warn-bg); color: var(--warn); }
.badge-crit { background: var(--crit-bg); color: var(--crit); }
.badge-info { background: var(--info-bg); color: var(--info); }
.badge-muted { background: var(--surface-2); color: var(--muted); }

/* ---- charts ---- */
.chart-head { display: flex; justify-content: space-between; align-items: flex-start; gap: var(--s3); flex-wrap: wrap; }
.chart-summary { font-size: 12.5px; color: var(--muted); }
.legend { display: flex; flex-wrap: wrap; gap: 6px var(--s4); margin: var(--s2) 0 var(--s1); font-size: 12.5px; }
.legend-item { display: inline-flex; align-items: center; gap: 6px; }
.legend-item svg { width: 22px; height: 8px; overflow: visible; }
.legend-item b { font-weight: 650; }
.chart-wrap { position: relative; touch-action: pan-y; }
.chart-wrap:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.chart-wrap svg { display: block; width: 100%; height: auto; overflow: visible; }
.chart-wrap text { fill: var(--muted); font-size: 11px; font-family: var(--font); }
.chart-wrap .gridline { stroke: var(--grid); stroke-width: 1; shape-rendering: crispEdges; }
.chart-wrap .threshold { stroke: var(--warn); stroke-width: 1.5; stroke-dasharray: 5 4; }
.chart-wrap .threshold-label { fill: var(--warn); font-weight: 650; paint-order: stroke; stroke: var(--surface); stroke-width: 3px; }
.cursor-line { position: absolute; top: 0; width: 1px; background: var(--muted); opacity: .7; pointer-events: none; display: none; }
.tooltip {
  position: absolute; top: 6px; z-index: 5; pointer-events: none; display: none; min-width: 150px;
  background: var(--surface-2); border: 1px solid var(--border); border-radius: 8px; padding: 6px 10px;
  font-size: 12px; box-shadow: 0 6px 18px rgba(0, 0, 0, .28);
}
.tooltip .tt-time { color: var(--muted); margin-bottom: 2px; }
.tooltip .tt-row { display: flex; justify-content: space-between; gap: var(--s4); }
.empty-chart { height: 120px; display: grid; place-items: center; color: var(--muted); }

/* ---- tables ---- */
.table-wrap { overflow-x: auto; border-radius: 8px; }
.table-wrap:focus-visible { outline: 2px solid var(--accent); }
table { width: 100%; border-collapse: collapse; font-size: 13px; }
th, td { padding: 7px var(--s3); text-align: left; border-bottom: 1px solid var(--border); vertical-align: middle; }
th { color: var(--muted); font-weight: 600; font-size: 12px; white-space: nowrap; background: transparent; }
th.num, td.num { text-align: right; }
tbody tr:last-child td { border-bottom: 0; }
tbody tr:hover { background: var(--surface-2); }
th button { font: inherit; color: inherit; background: none; border: 0; padding: 4px 2px; cursor: pointer; display: inline-flex; gap: 4px; align-items: center; min-height: 28px; }
th button:hover { color: var(--text); }
th button .sort { opacity: .35; font-size: 10px; }
th[aria-sort="ascending"] button .sort, th[aria-sort="descending"] button .sort { opacity: 1; color: var(--accent); }
.cell-bar { display: grid; gap: 3px; min-width: 110px; }
.cell-bar .meter { height: 4px; }
.row-lv-crit td:first-child { box-shadow: inset 3px 0 0 var(--crit); }
.row-lv-warn td:first-child { box-shadow: inset 3px 0 0 var(--warn); }
.empty { padding: var(--s5); text-align: center; color: var(--muted); }
.toolbar { display: flex; gap: var(--s3); align-items: center; flex-wrap: wrap; }
.toolbar .search { position: relative; flex: 1 1 220px; max-width: 360px; }
.toolbar .search input { padding-left: 34px; min-height: 36px; }
.toolbar .search .icon { position: absolute; left: 10px; top: 9px; color: var(--muted); }
.check { display: inline-flex; align-items: center; gap: 6px; min-height: 34px; cursor: pointer; }
.check input { width: 16px; height: 16px; accent-color: var(--accent); }

/* per-core bars */
.cores { display: flex; gap: 4px; align-items: flex-end; height: 44px; }
.cores > div { flex: 1; min-width: 8px; background: var(--surface-2); border-radius: 3px; position: relative; height: 100%; overflow: hidden; }
.cores > div > span { position: absolute; left: 0; right: 0; bottom: 0; background: var(--accent); }
.cores > div.lv-warn > span { background: var(--warn); }
.cores > div.lv-crit > span { background: var(--crit); }

.kv { display: grid; grid-template-columns: max-content 1fr; gap: 4px var(--s4); font-size: 13px; }
.kv dt { color: var(--muted); }
.kv dd { margin: 0; }
.stack { display: grid; grid-template-columns: minmax(0, 1fr); gap: var(--s3); }
.row { display: flex; gap: var(--s3); align-items: center; flex-wrap: wrap; }
.status-bars { display: grid; gap: 8px; }
.status-bars .sb { display: grid; grid-template-columns: 44px 1fr 72px; gap: var(--s3); align-items: center; font-size: 13px; }

/* ---- responsive ---- */
@media (max-width: 560px) {
  #pause-btn span { display: none; }
  #pause-btn { width: 34px; padding: 0; }
  .seg button { padding: 0 9px; }
}
@media (max-width: 899px) {
  .shell { grid-template-columns: minmax(0, 1fr); }
  .nav {
    position: fixed; z-index: 30; top: auto; bottom: 0; left: 0; right: 0; height: auto; flex-direction: row;
    border-right: 0; border-top: 1px solid var(--border); padding: 4px 4px calc(4px + env(safe-area-inset-bottom));
  }
  .nav .brand { display: none; }
  .nav-list { grid-auto-flow: column; grid-auto-columns: 1fr; width: 100%; gap: 2px; }
  .nav-list a { flex-direction: column; justify-content: center; gap: 2px; min-height: 52px; padding: 4px; font-size: 11.5px; position: relative; }
  .nav-list a[aria-current="page"] { box-shadow: inset 0 3px 0 var(--accent); }
  .nav-badge { position: absolute; top: 2px; right: calc(50% - 22px); margin: 0; }
  .content { padding-bottom: calc(64px + env(safe-area-inset-bottom)); }
  .topbar { padding: var(--s3) var(--s4); position: static; }
  .controls { margin-left: 0; width: 100%; }
  main { padding: var(--s4); }
  .banner { margin: var(--s3) var(--s4) 0; }
  .tile-value { font-size: 24px; }
  .updated { display: none; }
}
@media (pointer: coarse) {
  .btn, .icon-btn, .seg button { min-height: 44px; }
  .icon-btn { width: 44px; }
  th button { min-height: 40px; }
}
@media (max-width: 420px) {
  .seg button { padding: 0 8px; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition: none !important; animation: none !important; scroll-behavior: auto !important; }
}

/* ---- advice cards ---- */
.advice { display: grid; grid-template-columns: minmax(0, 1fr); gap: var(--s2); border-left: 4px solid var(--border); }
.advice-details, .steps > li { min-width: 0; }
.advice.sev-critical { border-left-color: var(--crit); }
.advice.sev-warning { border-left-color: var(--warn); }
.advice.sev-info { border-left-color: var(--info); }
.advice-head { display: flex; align-items: center; justify-content: space-between; gap: var(--s2); flex-wrap: wrap; }
.advice-title { font-size: 15.5px; overflow-wrap: anywhere; }
.advice-summary { color: var(--muted); max-width: 78ch; }
.chip { display: inline-flex; align-items: center; gap: 4px; padding: 1px 9px; border-radius: 999px; font-size: 12px; font-weight: 600; background: var(--surface-2); color: var(--muted); border: 1px solid var(--border); white-space: nowrap; }
.chip-fact { color: var(--ok); border-color: color-mix(in srgb, var(--ok) 45%, var(--border)); }
.chip-guess { color: var(--warn); border-color: color-mix(in srgb, var(--warn) 50%, var(--border)); cursor: help; }
.advice-details { margin-top: var(--s1); }
.advice-toggle { display: inline-flex; align-items: center; gap: 6px; cursor: pointer; color: var(--accent); font-weight: 600; min-height: 32px; list-style: none; border-radius: 6px; }
.advice-toggle::-webkit-details-marker { display: none; }
.advice-toggle .chev { transition: transform var(--dur); }
.advice-details[open] .chev { transform: rotate(180deg); }
.advice-toggle span:last-child { color: var(--muted); font-weight: 500; }
.advice-details h4 { margin: var(--s4) 0 var(--s2); font-size: 12px; text-transform: uppercase; letter-spacing: .05em; color: var(--muted); }
.evidence { margin: 0; padding-left: 20px; display: grid; gap: 4px; }
.steps { margin: 0; padding-left: 22px; display: grid; gap: var(--s3); }
.steps > li::marker { color: var(--muted); font-weight: 650; }
.cmd { display: flex; align-items: stretch; gap: 0; margin-top: 6px; background: var(--bg); border: 1px solid var(--border); border-radius: 8px; overflow: hidden; }
.cmd code { flex: 1; min-width: 0; padding: 8px 10px; font-family: var(--mono); font-size: 12.5px; overflow-x: auto; white-space: pre; user-select: all; }
.copy-btn { display: inline-flex; align-items: center; gap: 4px; padding: 0 10px; border: 0; border-left: 1px solid var(--border); background: var(--surface-2); color: var(--text); font: inherit; font-size: 12px; cursor: pointer; min-width: 96px; justify-content: center; }
.copy-btn:hover { background: var(--info-bg); }
.change-note { display: flex; align-items: center; gap: 6px; margin-top: 6px; color: var(--warn); font-size: 12.5px; font-weight: 600; }
.advice-note { margin-top: var(--s3); font-size: 12.5px; }
.advice-link { color: var(--text); font-weight: 650; text-decoration: none; }
.advice-link:hover { text-decoration: underline; }
.seg-wrap { flex-wrap: wrap; }
.seg-wrap button { border-top: 0; }
.toolbar .seg + .seg { margin-left: 0; }
@media (max-width: 560px) {
  .cmd { flex-direction: column; }
  .copy-btn { border-left: 0; border-top: 1px solid var(--border); min-height: 36px; }
}
@media (pointer: coarse) { .copy-btn, .advice-toggle { min-height: 44px; } }