/* ============================================================================
 * File: styles.css
 * Governing Standards:
 * - ISA-101 & IEC 62682: Muted dark-slate console hierarchy; high-salience alarms
 * - ISO 9241-112 & -125: Detectability, Discriminability, Legibility, Gestalt grouping
 * - ISO 9355 (1-4) & ISO 11064-4/-5: Paired actuator/readout instrumentation ergonomics
 * - ISO/IEC 40500 (WCAG 2.0): Contrast ratios >= 7:1 primary text, >= 4.5:1 secondary
 * ============================================================================ */

:root {
  /* ISA-101 Muted Console Surfaces */
  --bg-console: #0b0f17;
  --bg-panel: #121824;
  --bg-panel-elevated: #192232;
  --bg-scope-graticule: #070b10;
  --border-subtle: #26334a;
  --border-focus: #38bdf8;

  /* High-Legibility Typography (ISO 9241-112 / WCAG AAA) */
  --text-primary: #f1f5f9;
  --text-secondary: #cbd5e1;
  --text-muted: #94a3b8;
  --font-ui: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, sans-serif;
  --font-mono: "SF Mono", "JetBrains Mono", "Fira Code", Menlo, Consolas, monospace;

  /* High-Salience Trace & Signal Coding (ISO 9241-112 Discriminability) */
  --trace-ch1-vin: #22d3ee;     /* Cyan: Primary Input Vin(t) */
  --trace-ch2-vout: #fbbf24;    /* Amber: Op-Amp Output Vout(t) */
  --trace-ch3-vminus: #f472b6;  /* Magenta: Inverting / Virtual-Ground Node V-(t) */
  --trace-ch4-aux: #34d399;     /* Emerald: Aux Input V2(t) or Supply-to-Load Current */

  /* Falstad Voltage Potential & Current Colors */
  --falstad-pos: #10b981;
  --falstad-neg: #f43f5e;
  --falstad-neutral: #94a3b8;
  --falstad-current: #fde047;

  /* IEC 62682 Alarm Hierarchy */
  --alarm-nominal-bg: rgba(16, 185, 129, 0.14);
  --alarm-nominal-fg: #34d399;
  --alarm-warn-bg: rgba(245, 158, 11, 0.20);
  --alarm-warn-fg: #fbbf24;
  --alarm-crit-bg: rgba(239, 68, 68, 0.25);
  --alarm-crit-fg: #f87171;
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html, body {
  width: 100%;
  min-height: 100vh;
  background-color: var(--bg-console);
  color: var(--text-primary);
  font-family: var(--font-ui);
  font-size: 13px;
  line-height: 1.4;
  -webkit-font-smoothing: antialiased;
}

/* Accessibility Helpers */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
}

.hidden {
  display: none !important;
}

button:focus-visible,
select:focus-visible,
input:focus-visible {
  outline: 2px solid var(--border-focus);
  outline-offset: 2px;
}

/* ============================================================================
   TOP INSTRUMENTATION RIBBON
   ============================================================================ */
.console-header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 8px 14px;
  background: var(--bg-panel);
  border-bottom: 1px solid var(--border-subtle);
}

.brand-cluster {
  display: flex;
  align-items: center;
  gap: 10px;
}

.iso-badge {
  background: linear-gradient(135deg, #0284c7, #2563eb);
  color: #ffffff;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 11px;
  padding: 4px 8px;
  border-radius: 4px;
  letter-spacing: 0.06em;
}

.brand-titles h1 {
  font-size: 15px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--text-primary);
}

.brand-titles .subtitle {
  font-size: 11px;
  color: var(--text-muted);
}

.hardware-deck {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}

.control-pill-group {
  display: flex;
  align-items: center;
  gap: 5px;
  background: var(--bg-panel-elevated);
  border: 1px solid var(--border-subtle);
  padding: 3px 7px;
  border-radius: 6px;
}

.pill-label {
  font-size: 11px;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.console-select {
  background: var(--bg-console);
  color: var(--text-primary);
  border: 1px solid var(--border-subtle);
  border-radius: 4px;
  padding: 3px 6px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  cursor: pointer;
}

.console-select.compact {
  padding: 2px 5px;
  font-size: 11px;
}

.segmented-toggle {
  display: inline-flex;
  background: var(--bg-console);
  border-radius: 4px;
  padding: 2px;
  gap: 2px;
}

.seg-btn {
  background: transparent;
  color: var(--text-secondary);
  border: none;
  padding: 3px 8px;
  font-size: 11px;
  font-weight: 600;
  border-radius: 3px;
  cursor: pointer;
  transition: background 0.12s ease, color 0.12s ease;
}

.seg-btn:hover {
  color: var(--text-primary);
}

.seg-btn.active {
  background: #0284c7;
  color: #ffffff;
}

.rail-readout-pill {
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--bg-scope-graticule);
  border: 1px solid var(--border-subtle);
  padding: 4px 9px;
  border-radius: 6px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 600;
}

.rail-pos { color: var(--falstad-pos); }
.rail-ref { color: var(--trace-ch1-vin); }
.rail-neg { color: var(--falstad-neg); }

.icon-toggle-btn {
  background: var(--bg-console);
  color: var(--text-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: 4px;
  padding: 3px 8px;
  font-size: 11px;
  font-weight: 600;
  cursor: pointer;
}

.icon-toggle-btn.active {
  background: rgba(16, 185, 129, 0.18);
  color: #34d399;
  border-color: #059669;
}

.audit-gate-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  background: rgba(16, 185, 129, 0.12);
  color: var(--text-primary);
  border: 1px solid #059669;
  padding: 5px 10px;
  border-radius: 6px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  cursor: pointer;
}

.status-led {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #10b981;
  box-shadow: 0 0 6px #10b981;
}

/* ============================================================================
   7 MACRO-TAB BAR (ISO 9241-161)
   ============================================================================ */
.macro-tab-bar {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 4px;
  padding: 6px 14px 0;
  background: var(--bg-console);
  border-bottom: 1px solid var(--border-subtle);
}

.macro-tab {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 6px;
  background: var(--bg-panel);
  color: var(--text-secondary);
  border: 1px solid var(--border-subtle);
  border-bottom: none;
  border-radius: 6px 6px 0 0;
  padding: 7px 10px;
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s ease, color 0.15s ease;
}

.macro-tab:hover {
  background: var(--bg-panel-elevated);
  color: var(--text-primary);
}

.macro-tab.active {
  background: var(--bg-panel-elevated);
  color: #38bdf8;
  border-top: 2px solid #38bdf8;
}

.tab-index {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-muted);
}

.tab-code {
  font-family: var(--font-mono);
  font-size: 10px;
  background: rgba(56, 189, 248, 0.12);
  color: #7dd3fc;
  padding: 1px 5px;
  border-radius: 3px;
}

/* ============================================================================
   SUB-CIRCUIT PILL BAR & IEC 62682 ALARM STRIP
   ============================================================================ */
.subcircuit-ribbon {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 6px 14px;
  background: var(--bg-panel-elevated);
  border-bottom: 1px solid var(--border-subtle);
}

.subcircuit-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.subcircuit-pill {
  background: var(--bg-console);
  color: var(--text-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: 16px;
  padding: 4px 12px;
  font-size: 11.5px;
  font-weight: 600;
  cursor: pointer;
}

.subcircuit-pill.active {
  background: #0369a1;
  color: #ffffff;
  border-color: #38bdf8;
}

.alarm-annunciator-strip {
  display: flex;
  align-items: center;
  gap: 6px;
}

.alarm-chip {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  padding: 3px 9px;
  border-radius: 4px;
}

.alarm-chip.nominal {
  background: var(--alarm-nominal-bg);
  color: var(--alarm-nominal-fg);
  border: 1px solid rgba(52, 211, 153, 0.35);
}

.alarm-chip.warning {
  background: var(--alarm-warn-bg);
  color: var(--alarm-warn-fg);
  border: 1px solid #f59e0b;
}

.alarm-chip.critical {
  background: var(--alarm-crit-bg);
  color: var(--alarm-crit-fg);
  border: 1px solid #ef4444;
  animation: pulse-alarm 1.2s infinite ease-in-out;
}

@keyframes pulse-alarm {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.65; }
}

/* ============================================================================
   MAIN 4-QUADRANT OPERATOR WORKBENCH (ISO 11064-4)
   ============================================================================ */
.console-workbench {
  display: grid;
  grid-template-columns: 1.15fr 1fr;
  gap: 10px;
  padding: 10px 14px;
}

.workbench-left-col,
.workbench-right-col {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.panel-card {
  background: var(--bg-panel);
  border: 1px solid var(--border-subtle);
  border-radius: 8px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.panel-header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 7px 11px;
  background: var(--bg-panel-elevated);
  border-bottom: 1px solid var(--border-subtle);
}

.panel-header.compact {
  padding: 5px 9px;
}

.panel-title-group {
  display: flex;
  align-items: center;
  gap: 8px;
}

.panel-header h2 {
  font-size: 12.5px;
  font-weight: 700;
  color: var(--text-primary);
}

.standard-tag {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--text-muted);
  background: var(--bg-console);
  padding: 2px 6px;
  border-radius: 4px;
  border: 1px solid var(--border-subtle);
}

/* ============================================================================
   SCHEMATIC CANVAS & CAD TOOLBAR
   ============================================================================ */
.cad-toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 3px;
}

.cad-tool-btn,
.cad-action-btn {
  background: var(--bg-console);
  color: var(--text-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: 4px;
  padding: 3px 7px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  cursor: pointer;
}

.cad-tool-btn:hover,
.cad-action-btn:hover {
  color: var(--text-primary);
  border-color: var(--text-muted);
}

.cad-tool-btn.active {
  background: #0284c7;
  color: #ffffff;
  border-color: #38bdf8;
}

.cad-tool-btn.danger-tool.active {
  background: #dc2626;
  color: #ffffff;
  border-color: #f87171;
}

.toolbar-divider {
  width: 1px;
  height: 16px;
  background: var(--border-subtle);
  margin: 0 3px;
}

.canvas-viewport-wrapper {
  position: relative;
  width: 100%;
  background: var(--bg-scope-graticule);
  display: flex;
  justify-content: center;
  align-items: center;
}

#schematic-canvas {
  width: 100%;
  height: auto;
  display: block;
  cursor: crosshair;
}

.probe-tooltip {
  position: absolute;
  pointer-events: none;
  background: rgba(15, 23, 42, 0.95);
  border: 1px solid #38bdf8;
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 11px;
  padding: 5px 8px;
  border-radius: 4px;
  z-index: 20;
}

.opamp-power-telemetry,
.scope-metrics-footer {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 6px 11px;
  background: var(--bg-console);
  border-top: 1px solid var(--border-subtle);
  font-family: var(--font-mono);
  font-size: 11px;
}

.telemetry-item .tel-label {
  color: var(--text-muted);
}

.telemetry-item.highlight-supply strong {
  color: var(--trace-ch4-aux);
}

/* ============================================================================
   LOWER-LEFT: PAIRED ACTUATORS & LIVE EQUATION CARD (ISO 9355-4 / ISO 9241-110)
   ============================================================================ */
.controls-split-grid {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  min-height: 250px;
}

.sliders-column {
  border-right: 1px solid var(--border-subtle);
  display: flex;
  flex-direction: column;
}

.sliders-scroll-zone {
  padding: 8px 10px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  max-height: 245px;
  overflow-y: auto;
}

.actuator-row {
  display: grid;
  grid-template-columns: 135px 1fr 84px;
  align-items: center;
  gap: 8px;
  background: var(--bg-console);
  border: 1px solid var(--border-subtle);
  padding: 5px 8px;
  border-radius: 5px;
}

.actuator-label {
  font-size: 11.5px;
  font-weight: 600;
  color: var(--text-secondary);
}

.actuator-label .iso-des {
  font-family: var(--font-mono);
  font-size: 10px;
  color: #38bdf8;
  margin-right: 4px;
}

.actuator-slider {
  width: 100%;
  accent-color: #0284c7;
  cursor: pointer;
}

.actuator-readout {
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 700;
  color: var(--trace-ch2-vout);
  text-align: right;
  background: var(--bg-panel);
  border: 1px solid var(--border-subtle);
  border-radius: 4px;
  padding: 2px 5px;
}

.equation-pedagogy-column {
  display: flex;
  flex-direction: column;
}

.equation-display-box {
  padding: 8px 11px;
  background: var(--bg-scope-graticule);
  border-bottom: 1px solid var(--border-subtle);
}

.eq-label {
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  margin-bottom: 2px;
}

.eq-formula {
  font-family: var(--font-mono);
  font-size: 12.5px;
  font-weight: 700;
  color: var(--trace-ch1-vin);
  margin-bottom: 6px;
}

.eq-formula.live-num {
  color: var(--trace-ch2-vout);
  margin-bottom: 0;
}

.pedagogy-narrative {
  padding: 9px 11px;
  font-size: 12px;
  color: var(--text-secondary);
  line-height: 1.48;
  overflow-y: auto;
  max-height: 145px;
}

/* ============================================================================
   RIGHT COLUMN: DUAL OSCILLOSCOPE & ANALYTICAL CRT CONSOLE
   ============================================================================ */
.scope-controls-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}

.trace-legend {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
}

.trace-legend .dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
}

.trace-legend.ch1 { color: var(--trace-ch1-vin); }
.trace-legend.ch1 .dot { background: var(--trace-ch1-vin); }
.trace-legend.ch2 { color: var(--trace-ch2-vout); }
.trace-legend.ch2 .dot { background: var(--trace-ch2-vout); }
.trace-legend.ch3 { color: var(--trace-ch3-vminus); }
.trace-legend.ch3 .dot { background: var(--trace-ch3-vminus); }
.trace-legend.ch4 { color: var(--trace-ch4-aux); }
.trace-legend.ch4 .dot { background: var(--trace-ch4-aux); }

.scope-canvas-wrapper {
  background: var(--bg-scope-graticule);
  width: 100%;
  display: flex;
  justify-content: center;
}

#dso-canvas,
#analyzer-canvas {
  width: 100%;
  height: auto;
  display: block;
}

.metric-chip strong {
  color: var(--text-primary);
}

.metric-chip.ch1 strong { color: var(--trace-ch1-vin); }
.metric-chip.ch2 strong { color: var(--trace-ch2-vout); }

/* ============================================================================
   11-AGENT ISO/IEC STANDARDS AUDIT MODAL DRAWER
   ============================================================================ */
.audit-modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(5, 8, 14, 0.82);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  z-index: 100;
}

.audit-modal-card {
  width: min(1120px, 96vw);
  max-height: 88vh;
  background: var(--bg-panel);
  border: 1px solid #38bdf8;
  border-radius: 8px;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.audit-modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  background: var(--bg-panel-elevated);
  border-bottom: 1px solid var(--border-subtle);
}

.close-modal-btn {
  background: transparent;
  color: var(--text-secondary);
  border: none;
  font-size: 22px;
  cursor: pointer;
}

.audit-modal-body {
  padding: 14px 16px;
  overflow-y: auto;
}

@media (max-width: 1200px) {
  .console-workbench {
    grid-template-columns: 1fr;
  }
  .macro-tab-bar {
    grid-template-columns: repeat(4, 1fr);
  }
}