/* ═══════════════════════════════════════════════════════
   SRE Incident Command  ·  Premium Dark UI
   60 % Obsidian base  ·  30 % Slate surfaces  ·  10 % Amber
   Fonts: Plus Jakarta Sans (body) + IBM Plex Mono (data)
   All class names match index.html exactly — no HTML edits needed
   ═══════════════════════════════════════════════════════ */

/* ─── Design tokens ──────────────────────────────────── */
:root {
  /* 60 %  Base — deep obsidian, replacing the old flat #222831 navy */
  --bg:           #0c0e12;
  --bg-deep:      #080a0d;

  /* 30 %  Surfaces — three distinct elevation layers */
  --surface:      #12161e;   /* panels */
  --surface-2:    #181d27;   /* cards, inputs */
  --surface-3:    #1e2333;   /* hover / elevated */

  /* Borders */
  --line:         rgba(255,255,255,0.055);
  --line-strong:  rgba(255,255,255,0.11);
  --line-xstrong: rgba(255,255,255,0.18);

  /* Text */
  --text:         #eef0f4;
  --text-soft:    rgba(238,240,244,0.68);
  --text-faint:   rgba(238,240,244,0.40);
  --text-xfaint:  rgba(238,240,244,0.22);

  /* 10 %  Accent — warm amber replacing the old teal #00adb5 */
  --accent:        #e8972a;
  --accent-hi:     #f5b04a;
  --accent-soft:   rgba(232,151,42,0.12);
  --accent-strong: rgba(232,151,42,0.26);

  /* Semantic status */
  --success:      #3ecf8e;
  --success-soft: rgba(62,207,142,0.10);
  --warning:      #f0b429;
  --warning-soft: rgba(240,180,41,0.10);
  --danger:       #f06565;
  --danger-soft:  rgba(240,101,101,0.10);

  /* Shadows */
  --shadow:       0 2px 8px rgba(0,0,0,0.45), 0 1px 2px rgba(0,0,0,0.3);
  --shadow-lg:    0 8px 24px rgba(0,0,0,0.55), 0 2px 6px rgba(0,0,0,0.35);

  /* Radii */
  --r-xs: 3px;
  --r-sm: 5px;
  --r-md: 8px;
  --r-lg: 10px;
}

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

html,
body {
  margin: 0;
  min-height: 100%;
}

/* ─── Base ───────────────────────────────────────────── */
body {
  color: var(--text);
  font-family: "Plus Jakarta Sans", system-ui, sans-serif;
  font-size: 14px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  background:
    radial-gradient(ellipse 70% 40% at 0% 0%,  rgba(232,151,42,0.045) 0%, transparent 55%),
    radial-gradient(ellipse 50% 50% at 100% 100%, rgba(80,90,160,0.04) 0%, transparent 60%),
    linear-gradient(160deg, #0c0f14 0%, #080a0d 100%);
}

/* Dot-grid texture — finer and more premium than original grid lines */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  background-image: radial-gradient(circle, rgba(255,255,255,0.028) 1px, transparent 1px);
  background-size: 28px 28px;
  pointer-events: none;
  z-index: 0;
}

/* Unused elements from original — keep hidden */
.sky-gradient,
.mist { display: none; }

/* ─── Mono font — applied to all data/label elements ─── */
.eyebrow,
.panel-kicker,
.metric-label,
.telemetry-head,
.field span,
.tiny,
.status-pill,
.status-tag,
.chip,
.tier-pill,
.btn,
.tier-counter,
.task-meta,
.svc-meta,
.info-card span,
.result-stat span,
.metric-chip span,
input, select, textarea {
  font-family: "IBM Plex Mono", monospace;
}

/* ─── Universal shadows ──────────────────────────────── */
.masthead,
.panel,
.task-card,
.svc-card,
.alert-item,
.queue-item,
.timeline-item,
.metric-tile,
.info-card,
.result-stat,
.metric-chip,
.telemetry-block {
  box-shadow: var(--shadow);
}

/* ═══ MASTHEAD ══════════════════════════════════════════ */
.masthead {
  position: relative;
  z-index: 1;
  width: min(1460px, calc(100% - 20px));
  margin: 10px auto 10px;
  padding: 20px 24px;
  border: 1px solid var(--line-strong);
  border-radius: var(--r-lg);
  background: var(--surface);
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 20px;
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}

/* Amber rule at very top */
.masthead::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg,
    transparent 0%,
    var(--accent) 25%,
    var(--accent-hi) 50%,
    var(--accent) 75%,
    transparent 100%);
  opacity: 0.75;
}

/* Subtle inner glow from the top rule */
.masthead::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 55% 55% at 50% -10%, rgba(232,151,42,0.055), transparent 60%),
    linear-gradient(180deg, rgba(255,255,255,0.018) 0%, transparent 40%);
  pointer-events: none;
}

.masthead-copy {
  position: relative;
  z-index: 1;
  max-width: 50rem;
}

/* Eyebrow / kicker labels */
.eyebrow,
.panel-kicker {
  display: flex;
  align-items: center;
  gap: 7px;
  color: var(--accent);
  font-size: 0.63rem;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  margin: 0 0 7px;
}

.eyebrow::before,
.panel-kicker::before {
  content: "";
  display: inline-block;
  width: 14px;
  height: 1px;
  background: var(--accent);
  flex-shrink: 0;
}

.masthead h1 {
  margin: 0;
  font-size: clamp(1.9rem, 4vw, 3.2rem);
  font-weight: 800;
  line-height: 0.95;
  letter-spacing: -0.05em;
  color: var(--text);
}

.masthead-text,
.hero-description,
.body-copy,
.svc-meta,
.tiny,
.is-empty,
.queue-item p,
.timeline-item p {
  color: var(--text-soft);
}

.masthead-text {
  margin: 10px 0 0;
  max-width: 44rem;
  font-size: 0.88rem;
  line-height: 1.65;
}

/* Metric tiles */
.masthead-metrics {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: repeat(3, minmax(118px, 1fr));
  gap: 8px;
  align-self: flex-start;
  flex-shrink: 0;
}

.metric-tile {
  padding: 11px 13px;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: var(--surface-2);
}

.metric-label {
  display: block;
  color: var(--text-faint);
  font-size: 0.6rem;
  letter-spacing: 0.13em;
  text-transform: uppercase;
}

.metric-tile strong {
  display: block;
  margin-top: 9px;
  font-size: 1.15rem;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--text);
}

.metric-status {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

/* ═══ CANVAS LAYOUT ════════════════════════════════════ */
.canvas {
  position: relative;
  z-index: 1;
  width: min(1460px, calc(100% - 20px));
  margin: 0 auto 14px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 330px;
  gap: 10px;
}

.canvas-banners { align-items: start; }
.canvas-single { grid-template-columns: minmax(0, 1fr); }

.page-view { display: none; }
.page-view.is-active { display: block; }

.view-tabs {
  position: relative;
  z-index: 1;
  width: min(1460px, calc(100% - 20px));
  margin: 0 auto 10px;
  padding: 6px;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: rgba(18, 22, 30, 0.92);
  display: flex;
  gap: 6px;
  box-shadow: var(--shadow);
}

.view-tab {
  appearance: none;
  border: 1px solid transparent;
  border-radius: var(--r-md);
  background: transparent;
  color: var(--text-soft);
  cursor: pointer;
  padding: 10px 14px;
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  transition: 140ms ease;
}

.view-tab:hover {
  color: var(--text);
  background: rgba(255,255,255,0.03);
}

.view-tab.is-active {
  color: var(--text);
  border-color: var(--line-strong);
  background: var(--surface-2);
  box-shadow: inset 0 1px 0 rgba(255,255,255,0.04);
}

.tier-board {
  display: block;
  grid-column: 1 / 2;
}

/* ─── Panels ─────────────────────────────────────────── */
.panel {
  position: relative;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: var(--surface);
  padding: 16px;
  overflow: hidden;
}

/* Top highlight stripe */
.panel::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.06), transparent);
  pointer-events: none;
}

.panel-catalog,
.panel-telemetry { min-height: 820px; }
.panel-catalog { display: none; }

.main-stack {
  display: grid;
  gap: 10px;
  grid-column: 1 / 2;
}

.content-grid {
  display: grid;
  grid-template-columns: 1.08fr 1fr;
  gap: 10px;
}

.runtime-page-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin-top: 10px;
}

.runtime-results-grid {
  margin-top: 14px;
}

.runtime-panel {
  padding: 16px;
}

.runtime-form-grid .field-span-2 {
  grid-column: span 2;
}

.runtime-info-strip {
  margin-top: 14px;
}

.runtime-action-stack {
  margin-bottom: 14px;
}

#ai-custom-provider-field {
  display: none;
}

#ai-custom-provider-field.is-visible {
  display: grid;
}

/* Panel headers */
.panel-header,
.action-cluster,
.queue-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.action-cluster { flex-wrap: wrap; }

.panel-header h2,
.queue-header h3 {
  margin: 0;
  color: var(--text);
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: -0.025em;
}

.panel-header {
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 14px;
}

.hero-description {
  margin: 0 0 14px;
  font-size: 0.87rem;
  line-height: 1.65;
}

/* ═══ TIER BOARD ════════════════════════════════════════ */
.tier-banner {
  position: relative;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: var(--surface);
  padding: 16px;
  box-shadow: var(--shadow);
  overflow: hidden;
}

.tier-banner::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.06), transparent);
  pointer-events: none;
}

.tier-selector-shell { display: grid; gap: 12px; }

.tier-banner-head {
  display: flex;
  justify-content: space-between;
  gap: 8px;
  align-items: flex-end;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 4px;
}

.tier-banner h2 {
  margin: 0;
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: -0.025em;
}

.tier-counter {
  color: var(--text-faint);
  font-size: 0.6rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.tier-scenario-list { display: grid; gap: 7px; }

.tier-toggle-row {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 8px;
}

.tier-mode-button {
  position: relative;
  border: 1px solid var(--line-strong);
  border-radius: var(--r-md);
  min-height: 54px;
  background: var(--surface-2);
  color: var(--text-soft);
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.76rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  cursor: pointer;
  transition: transform 130ms ease, border-color 130ms ease,
              background 130ms ease, color 130ms ease, box-shadow 130ms ease;
  overflow: hidden;
}

.tier-mode-button::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(160deg, rgba(255,255,255,0.03) 0%, transparent 60%);
  pointer-events: none;
}

.tier-mode-button:hover {
  transform: translateY(-2px);
  border-color: var(--accent-strong);
  color: var(--accent-hi);
  background: var(--surface-3);
  box-shadow: 0 4px 12px rgba(0,0,0,0.4);
}

.tier-mode-button.is-active {
  border-color: var(--accent);
  background: linear-gradient(160deg, rgba(232,151,42,0.18), rgba(232,151,42,0.07));
  color: var(--accent-hi);
  box-shadow: 0 0 0 1px var(--accent-strong), 0 4px 12px rgba(232,151,42,0.12);
}

.tier-active-panel {
  border-top: 1px solid var(--line);
  padding-top: 10px;
}

.tier-active-head h3 {
  margin: 0;
  font-size: 0.92rem;
  font-weight: 700;
}

/* ─── Task / service / queue / timeline shared base ──── */
.task-card,
.svc-card,
.alert-item,
.queue-item,
.timeline-item,
.telemetry-block {
  border: 1px solid var(--line);
  background: var(--surface-2);
}

/* ─── Task Cards ─────────────────────────────────────── */
.task-card {
  padding: 12px 14px;
  border-radius: var(--r-md);
  cursor: pointer;
  transition: transform 130ms ease, border-color 130ms ease,
              background 130ms ease, box-shadow 130ms ease;
  position: relative;
  overflow: hidden;
}

/* Left amber reveal bar */
.task-card::after {
  content: "";
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 2px;
  background: var(--accent);
  opacity: 0;
  transition: opacity 130ms ease;
}

.task-card:hover {
  transform: translateX(3px);
  border-color: var(--line-strong);
  background: var(--surface-3);
}

.task-card:hover::after { opacity: 1; }

.task-card.is-active {
  transform: translateX(3px);
  border-color: var(--accent-strong);
  background: linear-gradient(135deg, rgba(232,151,42,0.09), var(--surface-2));
  box-shadow: 0 0 0 1px var(--accent-soft), var(--shadow);
}

.task-card.is-active::after { opacity: 1; }

.task-title-row,
.svc-card header {
  display: flex;
  justify-content: space-between;
  gap: 8px;
  align-items: flex-start;
}

.task-card h3,
.svc-card h3,
.queue-item h4,
.timeline-item h4 {
  margin: 0;
  color: var(--text);
  font-size: 0.87rem;
  font-weight: 600;
  line-height: 1.25;
}

.body-copy,
.task-meta,
.svc-meta,
.timeline-item p,
.queue-item p {
  margin-top: 6px;
  font-size: 0.73rem;
  line-height: 1.5;
}

/* ─── Service grid ───────────────────────────────────── */
.svc-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
  margin-top: 12px;
}

.svc-card {
  padding: 12px;
  border-radius: var(--r-md);
  border-top: 2px solid var(--line-strong);
  position: relative;
  overflow: hidden;
}

.svc-card header { margin-bottom: 4px; }

.svc-card.status-healthy  {
  border-top-color: var(--success);
  box-shadow: var(--shadow), 0 -2px 10px rgba(62,207,142,0.14);
}
.svc-card.status-degraded {
  border-top-color: var(--warning);
  box-shadow: var(--shadow), 0 -2px 10px rgba(240,180,41,0.14);
}
.svc-card.status-down {
  border-top-color: var(--danger);
  box-shadow: var(--shadow), 0 -2px 10px rgba(240,101,101,0.14);
}

/* ─── Status badges ──────────────────────────────────── */
.status-tag,
.status-pill {
  display: inline-flex;
  align-items: center;
  padding: 5px 8px;
  border-radius: var(--r-xs);
  font-size: 0.63rem;
  font-weight: 500;
  border: 1px solid transparent;
  letter-spacing: 0.04em;
  white-space: nowrap;
}

.status-ready    { color: #6adec0; background: var(--success-soft); border-color: rgba(62,207,142,0.22); }
.status-working  { color: var(--warning); background: var(--warning-soft); border-color: rgba(240,180,41,0.22); }
.status-error    { color: var(--danger);  background: var(--danger-soft);  border-color: rgba(240,101,101,0.22); }
.status-healthy  { color: var(--success); background: var(--success-soft); border-color: rgba(62,207,142,0.22); }
.status-degraded { color: var(--warning); background: var(--warning-soft); border-color: rgba(240,180,41,0.22); }
.status-down     { color: var(--danger);  background: var(--danger-soft);  border-color: rgba(240,101,101,0.22); }

/* ─── Metrics grid ───────────────────────────────────── */
.metrics-row,
.result-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 7px;
  margin-top: 10px;
}

.info-card,
.result-stat,
.metric-chip {
  border-radius: var(--r-xs);
  border: 1px solid var(--line);
  background: var(--surface-2);
  padding: 10px 11px;
}

.info-card span,
.result-stat span,
.metric-chip span {
  display: block;
  color: var(--text-faint);
  font-size: 0.6rem;
  letter-spacing: 0.11em;
  text-transform: uppercase;
}

.info-card strong,
.result-stat strong,
.metric-chip strong {
  display: block;
  margin-top: 6px;
  color: var(--text);
  font-size: 0.9rem;
  font-weight: 600;
}

/* ─── Chip rows ──────────────────────────────────────── */
.chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 12px;
}

.chip,
.tier-pill {
  display: inline-flex;
  align-items: center;
  padding: 4px 9px;
  border-radius: var(--r-xs);
  border: 1px solid var(--accent-strong);
  background: var(--accent-soft);
  color: var(--accent-hi);
  font-size: 0.63rem;
  font-weight: 500;
  letter-spacing: 0.06em;
}

.chip-row-secondary .chip {
  border-color: var(--line-strong);
  background: rgba(255,255,255,0.025);
  color: var(--text-soft);
}

/* ─── Info strip ─────────────────────────────────────── */
.info-strip {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 8px;
  margin-top: 12px;
}

/* ─── Alerts ─────────────────────────────────────────── */
.task-list,
.alert-list,
.q-list,
.obs-timeline {
  display: grid;
  gap: 8px;
}

.task-list { margin-top: 10px; }

.alert-item,
.queue-item,
.timeline-item {
  border-radius: var(--r-sm);
  padding: 10px 11px;
}

.alert-item {
  border-left: 3px solid var(--warning);
  background: var(--warning-soft);
  border-color: rgba(240,180,41,0.18);
  color: var(--text-soft);
  font-size: 0.79rem;
  line-height: 1.5;
}

/* ─── Timeline ───────────────────────────────────────── */
.timeline-item {
  position: relative;
  overflow: hidden;
}

.timeline-item h4 { margin-bottom: 2px; }

.timeline-item::before {
  content: "";
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 3px;
  background: linear-gradient(180deg, var(--accent), rgba(232,151,42,0.08));
}

/* ─── Buttons ────────────────────────────────────────── */
.btn {
  border: 1px solid var(--line-strong);
  border-radius: var(--r-xs);
  padding: 7px 13px;
  font-size: 0.67rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  cursor: pointer;
  transition: transform 130ms ease, border-color 130ms ease,
              background 130ms ease, color 130ms ease, box-shadow 130ms ease;
  position: relative;
  overflow: hidden;
  white-space: nowrap;
}

.btn::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(160deg, rgba(255,255,255,0.04) 0%, transparent 60%);
  pointer-events: none;
}

.btn:hover { transform: translateY(-1px); }

/* Primary — amber */
.btn-solid {
  background: var(--accent);
  border-color: var(--accent);
  color: #09090b;
  font-weight: 700;
  box-shadow: 0 1px 3px rgba(0,0,0,0.4), 0 0 14px rgba(232,151,42,0.18);
}

.btn-solid:hover {
  background: var(--accent-hi);
  border-color: var(--accent-hi);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0,0,0,0.5), 0 0 22px rgba(232,151,42,0.28);
}

/* Ghost */
.btn-muted {
  background: rgba(255,255,255,0.028);
  color: var(--text);
}

.btn-muted:hover {
  color: var(--accent-hi);
  border-color: var(--accent-strong);
  background: rgba(232,151,42,0.06);
}

.btn:active { transform: translateY(0) !important; }

/* ─── Composer ───────────────────────────────────────── */
.composer-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.field,
.textarea-field {
  display: grid;
  gap: 5px;
}

.field-inline {
  min-width: 112px;
}

.field-inline input {
  min-width: 0;
}

.field span {
  color: var(--text-faint);
  font-size: 0.6rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-weight: 500;
}

input, select, textarea {
  width: 100%;
  border-radius: var(--r-xs);
  border: 1px solid var(--line-strong);
  background: var(--surface-2);
  color: var(--text);
  padding: 9px 11px;
  font: inherit;
  font-size: 0.78rem;
  transition: border-color 130ms ease, box-shadow 130ms ease, background 130ms ease;
  -webkit-appearance: none;
}

input::placeholder, textarea::placeholder { color: var(--text-xfaint); }

input:focus,
select:focus,
textarea:focus {
  outline: none;
  border-color: var(--accent);
  background: var(--surface-3);
  box-shadow: 0 0 0 3px rgba(232,151,42,0.12);
}

select {
  cursor: pointer;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='10' viewBox='0 0 24 24' fill='none' stroke='rgba(238,240,244,0.35)' stroke-width='2.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 10px center;
  padding-right: 30px;
}

select option { background: var(--surface-2); color: var(--text); }
textarea { resize: vertical; }
.textarea-field { margin-top: 10px; }

.queue-wrap { margin-top: 14px; }
.queue-header { margin-bottom: 8px; }

/* ─── Telemetry ──────────────────────────────────────── */
.telemetry-block {
  border-radius: var(--r-md);
  padding: 12px;
  margin-top: 10px;
}

.telemetry-block:first-of-type { margin-top: 0; }

.telemetry-head {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--accent);
  font-size: 0.6rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  margin-bottom: 9px;
}

/* Extending rule line */
.telemetry-head::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--line-strong);
}

.telemetry-block-grow { min-height: 340px; }

.panel-ai-runtime { min-height: 820px; }

/* ─── Empty state ────────────────────────────────────── */
.is-empty {
  color: var(--text-xfaint);
  font-style: italic;
  font-size: 0.76rem;
}

/* ─── Scrollbars ─────────────────────────────────────── */
::-webkit-scrollbar { width: 5px; height: 5px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--line-xstrong); border-radius: 99px; }
::-webkit-scrollbar-thumb:hover { background: rgba(255,255,255,0.22); }

/* ═══ RESPONSIVE — mirrors original breakpoints exactly ═ */
@media (max-width: 1360px) {
  .canvas { grid-template-columns: 1fr; }
  .panel-telemetry { grid-column: auto; min-height: auto; }
  .tier-board, .main-stack { grid-column: auto; }
  .runtime-page-grid { grid-template-columns: 1fr; }
}

@media (max-width: 1120px) {
  .canvas, .content-grid { grid-template-columns: 1fr; }
  .panel-telemetry { min-height: auto; }
  .masthead { flex-direction: column; }
  .view-tabs { overflow-x: auto; }
}

@media (max-width: 760px) {
  .masthead, .canvas { width: min(100% - 16px, 100%); }
  .masthead { margin-top: 8px; padding: 16px; }
  .view-tabs { width: min(100% - 16px, 100%); }
  .masthead-metrics,
  .info-strip,
  .svc-grid,
  .composer-grid,
  .metrics-row,
  .result-grid,
  .tier-toggle-row,
  .runtime-page-grid { grid-template-columns: 1fr; }
}