/* ==========================================================================
   Relay — operations control room
   Plain CSS, system fonts only. Tokens first, then layout, then components.
   ========================================================================== */

:root {
  color-scheme: light dark;

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

  /* neutrals */
  --bg: #f2f3f5;
  --surface: #ffffff;
  --surface-2: #f7f8fa;
  --surface-3: #eceef2;
  --border: #e1e4e9;
  --border-strong: #c5cad3;
  --text: #1a1e26;
  --text-2: #565d6b;
  --text-3: #6b7280;
  --ink-inverse: #f5f6f8;

  /* the one accent */
  --accent: #2456c9;
  --accent-strong: #1b45a6;
  --accent-soft: #e8eefb;
  --accent-contrast: #ffffff;

  /* status / severity (reserved, semantic) */
  --good: #1e7f47;
  --warn: #915d00;
  --bad: #b8322a;
  --sev-critical: #b8322a;
  --sev-high: #b5480f;
  --sev-medium: #915d00;
  --sev-low: #5c6470;

  /* chart */
  --chart-bar: #aab2bf;
  --chart-bar-hover: #8891a0;
  --chart-grid: #eceef2;
  --chart-axis: #d6dae1;

  --focus: var(--accent);
  --rail-w: 64px;
  --topbar-h: 44px;
  --radius: 4px;
  --shadow-1: 0 1px 2px rgba(16, 20, 28, 0.06);
  --shadow-sheet: 0 -8px 28px rgba(16, 20, 28, 0.22);
  --toast-bg: #1f242c;
  --toast-fg: #f5f6f8;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #121417;
    --surface: #1a1d22;
    --surface-2: #1f2329;
    --surface-3: #262b32;
    --border: #2a2f37;
    --border-strong: #3b414b;
    --text: #e7e9ed;
    --text-2: #a5abb7;
    --text-3: #8a919d;
    --ink-inverse: #14171b;

    --accent: #7ea6ff;
    --accent-strong: #9ab9ff;
    --accent-soft: #23304d;
    --accent-contrast: #0f1a33;

    --good: #4fbf7e;
    --warn: #e0a83c;
    --bad: #f0736a;
    --sev-critical: #f0736a;
    --sev-high: #f09258;
    --sev-medium: #e0a83c;
    --sev-low: #9aa2ae;

    --chart-bar: #4f5866;
    --chart-bar-hover: #667082;
    --chart-grid: #242930;
    --chart-axis: #343a44;

    --shadow-1: 0 1px 2px rgba(0, 0, 0, 0.35);
    --shadow-sheet: 0 -8px 28px rgba(0, 0, 0, 0.55);
    --toast-bg: #e7e9ed;
    --toast-fg: #14171b;
  }
}

:root[data-theme="dark"] {
  --bg: #121417;
  --surface: #1a1d22;
  --surface-2: #1f2329;
  --surface-3: #262b32;
  --border: #2a2f37;
  --border-strong: #3b414b;
  --text: #e7e9ed;
  --text-2: #a5abb7;
  --text-3: #8a919d;
  --ink-inverse: #14171b;

  --accent: #7ea6ff;
  --accent-strong: #9ab9ff;
  --accent-soft: #23304d;
  --accent-contrast: #0f1a33;

  --good: #4fbf7e;
  --warn: #e0a83c;
  --bad: #f0736a;
  --sev-critical: #f0736a;
  --sev-high: #f09258;
  --sev-medium: #e0a83c;
  --sev-low: #9aa2ae;

  --chart-bar: #4f5866;
  --chart-bar-hover: #667082;
  --chart-grid: #242930;
  --chart-axis: #343a44;

  --shadow-1: 0 1px 2px rgba(0, 0, 0, 0.35);
  --shadow-sheet: 0 -8px 28px rgba(0, 0, 0, 0.55);
  --toast-bg: #e7e9ed;
  --toast-fg: #14171b;
}

/* --------------------------------------------------------------------------
   Base
   -------------------------------------------------------------------------- */

*, *::before, *::after { box-sizing: border-box; }

html { height: 100%; }

body {
  margin: 0;
  min-height: 100%;
  font: 13px/1.45 var(--font-sans);
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

[hidden] { display: none !important; }

h1, h2, h3 { margin: 0; font-weight: 600; line-height: 1.3; }
h2 { font-size: 13px; }
h3 { font-size: 12px; color: var(--text-2); text-transform: uppercase; letter-spacing: 0.05em; }
p { margin: 0; }
a { color: var(--accent); }
button, input, select { font: inherit; color: inherit; }
button { cursor: pointer; }
svg { display: block; }
kbd {
  font: 11px/1 var(--font-mono);
  padding: 1px 4px;
  border: 1px solid var(--border-strong);
  border-bottom-width: 2px;
  border-radius: 3px;
  background: var(--surface-2);
  color: var(--text-2);
}

.visually-hidden {
  position: absolute !important;
  width: 1px; height: 1px;
  margin: -1px; padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

.mono { font-family: var(--font-mono); font-size: 12px; }
.num { font-variant-numeric: tabular-nums; font-feature-settings: "tnum"; }
.ta-right { text-align: right; }
.muted { color: var(--text-3); font-weight: 400; }

:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 2px;
}

.skip-link {
  position: absolute;
  left: 8px; top: -48px;
  z-index: 100;
  padding: 6px 10px;
  background: var(--accent);
  color: var(--accent-contrast);
  border-radius: var(--radius);
  text-decoration: none;
  font-weight: 600;
}
.skip-link:focus { top: 8px; }

.noscript {
  margin: 16px;
  padding: 12px;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  background: var(--surface);
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition: none !important; animation: none !important; }
}

/* --------------------------------------------------------------------------
   App shell
   -------------------------------------------------------------------------- */

.app {
  display: grid;
  grid-template-columns: var(--rail-w) minmax(0, 1fr);
  grid-template-rows: var(--topbar-h) minmax(0, 1fr);
  min-height: 100vh;
}

/* Rail */
.rail {
  grid-column: 1;
  grid-row: 1 / -1;
  position: sticky;
  top: 0;
  height: 100vh;
  display: flex;
  flex-direction: column;
  background: var(--surface);
  border-right: 1px solid var(--border);
  z-index: 30;
}

.rail-brand {
  display: flex;
  align-items: center;
  justify-content: center;
  height: var(--topbar-h);
  color: var(--accent);
  border-bottom: 1px solid var(--border);
}
.rail-brand svg { width: 22px; height: 22px; }

.rail-list {
  list-style: none;
  margin: 0;
  padding: 6px 0;
  display: flex;
  flex-direction: column;
  flex: 1;
}

.rail-item {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  height: 56px;
  color: var(--text-2);
  text-decoration: none;
  font-size: 10.5px;
  font-weight: 500;
  letter-spacing: 0.01em;
}
.rail-item svg {
  width: 20px; height: 20px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.5;
  stroke-linecap: round;
}
.rail-item:hover { color: var(--text); background: var(--surface-2); }
.rail-item[aria-current="page"] { color: var(--accent); }
.rail-item[aria-current="page"]::before {
  content: "";
  position: absolute;
  left: 0; top: 10px; bottom: 10px;
  width: 3px;
  border-radius: 0 2px 2px 0;
  background: var(--accent);
}
.rail-item:focus-visible { outline-offset: -3px; }

.rail-badge {
  position: absolute;
  top: 6px;
  left: calc(50% + 4px);
  min-width: 16px;
  height: 16px;
  padding: 0 4px;
  border-radius: 8px;
  background: var(--sev-critical);
  color: var(--ink-inverse);
  font: 600 10px/16px var(--font-sans);
  text-align: center;
  font-variant-numeric: tabular-nums;
}
.rail-badge:empty { display: none; }

.rail-settings { border-top: 1px solid var(--border); }

/* Top bar */
.topbar {
  grid-column: 2;
  grid-row: 1;
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 0 16px;
  min-width: 0;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
}
.topbar-left, .topbar-right, .topbar-center {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
}
.topbar-center { flex: 1; justify-content: center; }
.topbar-right { margin-left: auto; }

.wordmark { font-weight: 700; letter-spacing: 0.02em; font-size: 14px; }
.env { color: var(--text-2); white-space: nowrap; }
.env strong { color: var(--text); font-weight: 600; }
.oncall { color: var(--text-2); white-space: nowrap; }
.oncall strong { color: var(--text); font-weight: 600; }

.clock {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-2);
  white-space: nowrap;
}

.sys-status {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  height: 26px;
  padding: 0 10px 0 8px;
  border: 1px solid var(--border);
  border-radius: 13px;
  background: var(--surface-2);
  font-weight: 500;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 100%;
}
.sys-text { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; min-width: 0; }
.sys-text-short { display: none; }
.sys-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--good);
  flex: none;
}
.sys-status[data-tone="critical"] .sys-dot { background: var(--sev-critical); box-shadow: 0 0 0 3px color-mix(in srgb, var(--sev-critical) 22%, transparent); }
.sys-status[data-tone="high"] .sys-dot { background: var(--sev-high); }
.sys-status[data-tone="medium"] .sys-dot { background: var(--sev-medium); }

/* Main */
.main {
  grid-column: 2;
  grid-row: 2;
  padding: 16px;
  min-width: 0;
}
.main:focus { outline: none; }

.main-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 340px;
  gap: 16px;
  align-items: start;
}
.col-primary { min-width: 0; }

/* --------------------------------------------------------------------------
   Controls
   -------------------------------------------------------------------------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  height: 30px;
  padding: 0 12px;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--text);
  font-weight: 500;
  white-space: nowrap;
  transition: background-color 0.12s, border-color 0.12s;
}
.btn:hover { background: var(--surface-2); border-color: var(--text-3); }
.btn:disabled { opacity: 0.55; cursor: default; }
.btn:disabled:hover { background: var(--surface); border-color: var(--border-strong); }
.btn-sm { height: 26px; padding: 0 8px; font-size: 12px; }
.btn-primary { background: var(--accent); border-color: var(--accent); color: var(--accent-contrast); }
.btn-primary:hover { background: var(--accent-strong); border-color: var(--accent-strong); }
.btn-primary:disabled:hover { background: var(--accent); border-color: var(--accent); }
.btn-ghost { background: transparent; border-color: transparent; color: var(--text-2); }
.btn-ghost:hover { background: var(--surface-3); border-color: transparent; color: var(--text); }

.icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px; height: 28px;
  padding: 0;
  border: 1px solid transparent;
  border-radius: var(--radius);
  background: transparent;
  color: var(--text-2);
}
.icon-btn svg { width: 16px; height: 16px; fill: none; stroke: currentColor; stroke-width: 1.6; stroke-linecap: round; }
.icon-btn:hover { background: var(--surface-3); color: var(--text); }

.search {
  position: relative;
  display: inline-flex;
  align-items: center;
}
.search input {
  height: 28px;
  width: 240px;
  padding: 0 28px 0 28px;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--text);
}
.search input::placeholder { color: var(--text-3); }
.search input::-webkit-search-cancel-button { -webkit-appearance: none; appearance: none; }
.search-icon {
  position: absolute;
  left: 8px;
  width: 15px; height: 15px;
  fill: none;
  stroke: var(--text-3);
  stroke-width: 1.6;
  stroke-linecap: round;
  pointer-events: none;
}
.search-kbd { position: absolute; right: 7px; pointer-events: none; }
.search input:focus ~ .search-kbd { display: none; }

.segmented {
  display: inline-flex;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  background: var(--surface);
  overflow: hidden;
}
.segmented button {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  height: 26px;
  padding: 0 9px;
  border: 0;
  border-right: 1px solid var(--border);
  background: transparent;
  color: var(--text-2);
  font-size: 12px;
  font-weight: 500;
  white-space: nowrap;
}
.segmented button:last-child { border-right: 0; }
.segmented button:hover { background: var(--surface-2); color: var(--text); }
.segmented button[aria-pressed="true"] { background: var(--accent-soft); color: var(--accent); }
.segmented button:focus-visible { outline-offset: -2px; }
.segmented .n {
  font-variant-numeric: tabular-nums;
  color: var(--text-3);
  font-weight: 400;
}
.segmented button[aria-pressed="true"] .n { color: inherit; }
.segmented .n:empty { display: none; }

.select select {
  height: 28px;
  padding: 0 26px 0 8px;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--text);
  appearance: none;
  -webkit-appearance: none;
  background-image: linear-gradient(45deg, transparent 50%, var(--text-2) 50%), linear-gradient(135deg, var(--text-2) 50%, transparent 50%);
  background-position: calc(100% - 13px) 12px, calc(100% - 9px) 12px;
  background-size: 4px 4px;
  background-repeat: no-repeat;
}

/* --------------------------------------------------------------------------
   Panels
   -------------------------------------------------------------------------- */

.panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-1);
  margin-bottom: 16px;
  min-width: 0;
}
.panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px 16px;
  padding: 10px 12px;
  border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
}
.panel-title { display: flex; align-items: baseline; gap: 8px; flex-wrap: wrap; min-width: 0; }
.panel-sub { color: var(--text-3); font-size: 12px; }

/* --------------------------------------------------------------------------
   Metrics (stat tiles)
   -------------------------------------------------------------------------- */

.metric-list {
  list-style: none;
  margin: 0 0 16px;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
}
.metric {
  display: grid;
  gap: 6px;
  padding: 10px 12px 11px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-1);
  min-width: 0;
}
.metric-label {
  font-size: 12px;
  color: var(--text-2);
}
.metric-value {
  font-size: 24px;
  font-weight: 600;
  letter-spacing: -0.01em;
  line-height: 1.1;
  white-space: nowrap;
}
.metric-trend {
  display: flex;
  align-items: baseline;
  gap: 6px;
  font-size: 12px;
  color: var(--text-3);
  flex-wrap: wrap;
}
.metric-delta {
  display: inline-flex;
  align-items: center;
  gap: 3px;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  color: var(--text-2);
}
.metric[data-tone="good"] .metric-delta { color: var(--good); }
.metric[data-tone="bad"] .metric-delta { color: var(--bad); }
.metric-arrow { font-size: 11px; }

/* --------------------------------------------------------------------------
   Throughput chart
   -------------------------------------------------------------------------- */

.chart-stats {
  display: flex;
  gap: 16px;
  margin: 0;
  font-size: 12px;
  flex-wrap: wrap;
}
.chart-stats div { display: flex; align-items: baseline; gap: 6px; }
.chart-stats dt { color: var(--text-3); }
.chart-stats dd { margin: 0; font-weight: 600; font-variant-numeric: tabular-nums; }
.chart-stats dd .muted { font-weight: 400; margin-left: 2px; }

.chart-wrap { position: relative; padding: 10px 12px 6px; }
.chart { position: relative; min-height: 190px; }
.chart svg {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius);
}
.chart svg:focus { outline: none; }
.chart svg:focus-visible { outline: 2px solid var(--focus); outline-offset: 2px; }

.chart-grid { stroke: var(--chart-grid); stroke-width: 1; }
.chart-axis { stroke: var(--chart-axis); stroke-width: 1; }
.chart-label { font: 11px var(--font-sans); fill: var(--text-3); font-variant-numeric: tabular-nums; }
.chart-cap { stroke: var(--sev-high); stroke-width: 1; stroke-dasharray: 3 3; opacity: 0.85; }
.chart-cap-label { font: 10.5px var(--font-sans); fill: var(--text-2); }
.chart-peak-label { font: 600 11px var(--font-sans); fill: var(--text-2); font-variant-numeric: tabular-nums; }
.bar .mark { fill: var(--chart-bar); transition: fill 0.12s; }
.bar.is-now .mark { fill: var(--accent); }
.bar rect.hit { fill: transparent; }
.bar.is-hot .mark { fill: var(--chart-bar-hover); }
.bar.is-now.is-hot .mark { fill: var(--accent-strong); }
.bar.is-hot rect.hit { fill: color-mix(in srgb, var(--text) 5%, transparent); }

.chart-tip {
  position: absolute;
  z-index: 5;
  pointer-events: none;
  padding: 5px 8px;
  border-radius: var(--radius);
  background: var(--toast-bg);
  color: var(--toast-fg);
  font-size: 12px;
  line-height: 1.3;
  white-space: nowrap;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.18);
  transform: translate(-50%, calc(-100% - 8px));
}
.chart-tip strong { font-weight: 600; font-variant-numeric: tabular-nums; }
.chart-tip span { opacity: 0.75; margin-left: 6px; }

.chart-data { border-top: 1px solid var(--border); }
.chart-data summary {
  padding: 7px 12px;
  color: var(--text-2);
  font-size: 12px;
  cursor: pointer;
  user-select: none;
}
.chart-data summary:hover { color: var(--text); }
.chart-data-body { max-height: 220px; overflow: auto; border-top: 1px solid var(--border); }
.data-table { width: 100%; border-collapse: collapse; font-size: 12px; }
.data-table th, .data-table td { padding: 4px 12px; border-bottom: 1px solid var(--border); text-align: left; }
.data-table th { color: var(--text-2); font-weight: 500; position: sticky; top: 0; background: var(--surface-2); }
.data-table tr.is-now td { color: var(--accent); font-weight: 600; }

/* --------------------------------------------------------------------------
   Incident table
   -------------------------------------------------------------------------- */

.panel-head-stack { align-items: flex-start; }
.filters {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  min-width: 0;
}

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

.inc-table {
  width: 100%;
  border-collapse: collapse;
  min-width: 0;
}
.inc-table th {
  padding: 0;
  text-align: left;
  background: var(--surface-2);
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}
.th-btn {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  width: 100%;
  padding: 6px 10px;
  border: 0;
  background: transparent;
  color: var(--text-2);
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  text-align: inherit;
}
.ta-right .th-btn { justify-content: flex-end; }
.th-btn:hover { color: var(--text); }
.th-btn:focus-visible { outline-offset: -2px; }
.sort-ind { width: 8px; display: inline-block; color: var(--text-3); }
th[aria-sort="ascending"] .sort-ind::after { content: "↑"; }
th[aria-sort="descending"] .sort-ind::after { content: "↓"; }
th[aria-sort] .th-btn { color: var(--text); }

.inc-table td {
  padding: 7px 10px;
  border-bottom: 1px solid var(--border);
  vertical-align: middle;
  white-space: nowrap;
}
.inc-table tbody tr { cursor: pointer; }
.inc-table tbody tr:hover { background: var(--surface-2); }
.inc-table tbody tr:focus-visible { outline: 2px solid var(--focus); outline-offset: -2px; }
.inc-table tbody tr[aria-current="true"] { background: var(--accent-soft); }
.inc-table tbody tr[aria-current="true"] td:first-child { box-shadow: inset 3px 0 0 var(--accent); }
.inc-table tbody tr:last-child td { border-bottom: 0; }

.col-inc { width: 100%; }
.col-inc .inc-sev-inline { display: none; }
.inc-id { color: var(--text-3); margin-right: 8px; }
.inc-title { font-weight: 500; }
.inc-sub { display: none; color: var(--text-3); font-family: var(--font-mono); font-size: 11px; }
.col-age { text-align: right; font-variant-numeric: tabular-nums; }
.col-service { font-family: var(--font-mono); font-size: 12px; }
.owner-unassigned { color: var(--warn); font-weight: 500; }

.sev {
  --sev-color: var(--sev-low);
  display: inline-block;
  min-width: 60px;
  padding: 1px 6px;
  border: 1px solid color-mix(in srgb, var(--sev-color) 40%, transparent);
  border-radius: 3px;
  background: color-mix(in srgb, var(--sev-color) 10%, transparent);
  color: var(--sev-color);
  font-size: 10.5px;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  text-align: center;
  line-height: 16px;
}
.sev[data-sev="critical"] { --sev-color: var(--sev-critical); background: var(--sev-critical); border-color: var(--sev-critical); color: var(--ink-inverse); }
.sev[data-sev="high"] { --sev-color: var(--sev-high); }
.sev[data-sev="medium"] { --sev-color: var(--sev-medium); }
.sev[data-sev="low"] { --sev-color: var(--sev-low); }

.status {
  --status-color: var(--text-3);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.status-dot {
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--status-color);
  flex: none;
}
.status[data-status="open"] { --status-color: var(--warn); }
.status[data-status="investigating"] { --status-color: var(--accent); }
.status[data-status="monitoring"] { --status-color: var(--good); }
.status[data-status="acknowledged"] { --status-color: var(--text-2); }
.status[data-status="resolved"] { --status-color: var(--text-3); }

.ack-mark {
  display: inline-flex;
  align-items: center;
  gap: 3px;
  margin-left: 8px;
  color: var(--text-3);
  font-size: 11px;
}
.ack-mark svg { width: 12px; height: 12px; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }

/* Empty states */
.empty {
  padding: 36px 16px;
  text-align: center;
  color: var(--text-2);
  display: grid;
  justify-items: center;
  gap: 6px;
}
.empty-title { font-weight: 600; color: var(--text); }
.empty-text { max-width: 44ch; }
.empty .btn { margin-top: 8px; }

/* --------------------------------------------------------------------------
   Detail panel
   -------------------------------------------------------------------------- */

.detail {
  position: sticky;
  top: calc(var(--topbar-h) + 16px);
  max-height: calc(100vh - var(--topbar-h) - 32px);
  overflow: auto;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-1);
}
.detail-empty { padding: 40px 20px; text-align: center; color: var(--text-2); display: grid; justify-items: center; gap: 8px; }
.detail-empty-icon { width: 28px; height: 28px; fill: none; stroke: var(--text-3); stroke-width: 1.4; margin-bottom: 4px; }
.detail-empty kbd { margin: 0 1px; }

.detail-head {
  position: relative;
  padding: 12px 44px 12px 14px;
  border-bottom: 1px solid var(--border);
}
.detail-meta { display: flex; align-items: center; gap: 8px; margin-bottom: 6px; }
.detail-id { color: var(--text-2); }
.detail-close { position: absolute; top: 8px; right: 8px; }
.detail-title { font-size: 15px; font-weight: 600; line-height: 1.3; }
.detail-title:focus { outline: none; }
.detail-title:focus-visible { outline: 2px solid var(--focus); outline-offset: 2px; }
.detail-note {
  margin-top: 8px;
  padding: 6px 8px;
  border-radius: var(--radius);
  background: var(--surface-3);
  color: var(--text-2);
  font-size: 12px;
}
.detail-note .btn { margin-left: 6px; vertical-align: middle; }

.facts {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px 12px;
  margin: 0;
  padding: 12px 14px;
  border-bottom: 1px solid var(--border);
}
.facts dt { font-size: 11px; color: var(--text-3); text-transform: uppercase; letter-spacing: 0.05em; }
.facts dd { margin: 2px 0 0; font-weight: 500; }
.facts dd.mono { font-weight: 400; }

.detail-actions {
  display: flex;
  gap: 8px;
  padding: 12px 14px;
  border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
}

.timeline { padding: 12px 14px 14px; }
.timeline h3 { margin-bottom: 8px; }
.timeline ol { list-style: none; margin: 0; padding: 0; }
.timeline li {
  position: relative;
  display: grid;
  grid-template-columns: 44px 1fr;
  gap: 10px;
  padding: 5px 0 5px 14px;
}
.timeline li::before {
  content: "";
  position: absolute;
  left: 2px; top: 11px;
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--border-strong);
}
.timeline li::after {
  content: "";
  position: absolute;
  left: 5px; top: 20px; bottom: -7px;
  width: 1px;
  background: var(--border);
}
.timeline li:last-child::after { display: none; }
.timeline li.is-live::before { background: var(--accent); }
.timeline time { color: var(--text-3); font-family: var(--font-mono); font-size: 11.5px; padding-top: 1px; }

.backdrop {
  position: fixed;
  inset: 0;
  z-index: 35;
  background: rgba(10, 12, 16, 0.4);
}

/* --------------------------------------------------------------------------
   Toasts
   -------------------------------------------------------------------------- */

.toast-region {
  position: fixed;
  right: 16px;
  bottom: 16px;
  z-index: 60;
  display: grid;
  gap: 8px;
  max-width: calc(100vw - 32px);
}
.toast {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 8px 8px 8px 12px;
  border-radius: var(--radius);
  background: var(--toast-bg);
  color: var(--toast-fg);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.22);
  font-size: 12.5px;
}
.toast-msg { flex: 1; }
.toast-action {
  height: 24px;
  padding: 0 8px;
  border: 1px solid color-mix(in srgb, var(--toast-fg) 30%, transparent);
  border-radius: 3px;
  background: transparent;
  color: inherit;
  font-weight: 600;
  font-size: 12px;
}
.toast-action:hover { background: color-mix(in srgb, var(--toast-fg) 12%, transparent); }
.toast .icon-btn { color: inherit; width: 24px; height: 24px; }
.toast .icon-btn:hover { background: color-mix(in srgb, var(--toast-fg) 12%, transparent); color: inherit; }
.toast :focus-visible { outline-color: var(--toast-fg); }

.load-error { padding: 40px 16px; text-align: center; color: var(--text-2); }

/* --------------------------------------------------------------------------
   Responsive
   -------------------------------------------------------------------------- */

@media (max-width: 1179px) {
  .main-grid { grid-template-columns: minmax(0, 1fr); }
  .detail { position: static; max-height: none; }
}

@media (max-width: 899px) {
  .metric-list { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .oncall { display: none; }
  .search input { width: 200px; }
}

@media (max-width: 719px) {
  :root { --rail-w: 0px; }
  .app { grid-template-columns: minmax(0, 1fr); }
  .topbar, .main { grid-column: 1; }
  .main { padding: 12px 12px 80px; }

  /* rail becomes a bottom tab bar */
  .rail {
    position: fixed;
    inset: auto 0 0 0;
    height: 56px;
    flex-direction: row;
    border-right: 0;
    border-top: 1px solid var(--border);
    padding-bottom: env(safe-area-inset-bottom);
  }
  .rail-brand { display: none; }
  .rail-list { flex-direction: row; padding: 0; }
  .rail-list li { flex: 1; min-width: 0; }
  .rail-item { height: 56px; width: 100%; }
  .rail-item[aria-current="page"]::before { left: 12px; right: 12px; top: 0; bottom: auto; height: 2px; width: auto; border-radius: 0 0 2px 2px; }
  .rail-settings { border-top: 0; border-left: 1px solid var(--border); flex: 0 0 64px; }
  .rail-badge { left: calc(50% + 6px); }

  .env { display: none; }
  .topbar { gap: 10px; padding: 0 12px; }
  .topbar-center { justify-content: flex-start; }

  .panel-head { padding: 10px; }
  .filters { width: 100%; }
  .search { flex: 1 1 100%; }
  .search input { width: 100%; }

  /* table: fold severity, service and owner into the incident cell */
  .col-owner, .col-service, .col-sev { display: none; }
  .col-inc .inc-sev-inline { display: inline-block; min-width: 0; margin-right: 6px; vertical-align: 1px; }
  .inc-id { font-size: 11px; margin: 0; }
  .inc-title { display: block; margin-top: 2px; }
  .inc-sub { display: block; margin-top: 2px; }
  .inc-table td { padding: 8px 8px; white-space: normal; vertical-align: top; }
  .inc-table td.col-age, .inc-table td.col-status { white-space: nowrap; padding-top: 9px; }
  .inc-table tbody tr[aria-current="true"] td:first-child { box-shadow: none; }
  .inc-table tbody tr[aria-current="true"] td.col-inc { box-shadow: inset 3px 0 0 var(--accent); }

  /* detail becomes a bottom sheet */
  .detail {
    position: fixed;
    top: auto;
    left: 0; right: 0;
    bottom: 56px;
    z-index: 40;
    max-height: 72vh;
    overflow: auto;
    margin: 0;
    border-radius: 8px 8px 0 0;
    border-bottom: 0;
    box-shadow: var(--shadow-sheet);
    transform: translateY(105%);
    visibility: hidden;
    transition: transform 0.2s ease, visibility 0s linear 0.2s;
  }
  .detail[data-open="true"] { transform: none; visibility: visible; transition-delay: 0s; }
  .detail-empty { display: none; }

  .toast-region { left: 12px; right: 12px; bottom: 72px; max-width: none; }
}

@media (max-width: 479px) {
  .metric-list { gap: 8px; }
  .metric { padding: 9px 10px 10px; }
  .metric-value { font-size: 21px; }
  .clock-sec { display: none; }
  .sys-text-full { display: none; }
  .sys-text-short { display: inline; }
  .metric-window { flex-basis: 100%; }
  .chart-stats { gap: 10px; }
  .segmented button { padding: 0 7px; }
  .facts { grid-template-columns: 1fr 1fr; }
}