/* Electrical Safety Simulator — test-bench theme
   Palette: graphite panel, instrument green (pass), fault red (fail),
   IEC blue (info), amber (fault/SFC state). Mono readout + sans body. */

.ess-sim-root {
  --ess-bg: #1B2227;
  --ess-panel: #232B33;
  --ess-panel-raised: #2A333C;
  --ess-border: #3A4550;
  --ess-text: #E7ECEF;
  --ess-text-dim: #9AA7B0;
  --ess-green: #5AD98F;
  --ess-green-dim: #2E4A3B;
  --ess-red: #E5484D;
  --ess-red-dim: #4A2A2C;
  --ess-blue: #4E9EE8;
  --ess-amber: #F5A623;
  --ess-mono: 'IBM Plex Mono', 'SFMono-Regular', Consolas, monospace;
  --ess-sans: 'IBM Plex Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

  font-family: var(--ess-sans);
  color: var(--ess-text);
  background: var(--ess-bg);
  border: 1px solid var(--ess-border);
  border-radius: 10px;
  padding: 0;
  max-width: 980px;
  margin: 1.5em auto;
  box-shadow: 0 8px 30px rgba(0,0,0,0.35);
  overflow: hidden;
}

.ess-sim-root * { box-sizing: border-box; }

@font-face {
  font-family: 'IBM Plex Mono';
  src: local('IBM Plex Mono');
}

.ess-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 20px;
  background: linear-gradient(180deg, #262F38 0%, #1F262D 100%);
  border-bottom: 1px solid var(--ess-border);
}

.ess-header .ess-title {
  font-size: 14px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ess-text-dim);
  font-weight: 600;
}

.ess-header .ess-title strong {
  color: var(--ess-text);
  font-weight: 700;
}

.ess-header-right {
  display: flex;
  align-items: center;
  gap: 16px;
}

.ess-timer {
  font-family: var(--ess-mono);
  font-size: 13px;
  color: var(--ess-blue);
  letter-spacing: 0.05em;
  min-width: 44px;
  text-align: right;
}

.ess-progress {
  font-family: var(--ess-mono);
  font-size: 13px;
  color: var(--ess-text-dim);
  letter-spacing: 0.05em;
}

.ess-progress .ess-score-good { color: var(--ess-green); }
.ess-progress .ess-score-bad { color: var(--ess-red); }

.ess-body {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 0;
}

@media (max-width: 720px) {
  .ess-body { grid-template-columns: 1fr; }
}

.ess-panel-left {
  padding: 20px;
  border-right: 1px solid var(--ess-border);
}

.ess-panel-right {
  padding: 20px;
  background: var(--ess-panel);
}

.ess-scenario-label {
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ess-blue);
  margin-bottom: 8px;
  font-weight: 700;
}

.ess-scenario-text {
  font-size: 14.5px;
  line-height: 1.55;
  color: var(--ess-text);
  margin-bottom: 16px;
}

.ess-scenario-text .ess-fault {
  color: var(--ess-amber);
  font-weight: 700;
}

.ess-tags {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 18px;
}

.ess-tag {
  font-family: var(--ess-mono);
  font-size: 11px;
  padding: 3px 8px;
  border-radius: 4px;
  border: 1px solid var(--ess-border);
  color: var(--ess-text-dim);
  background: var(--ess-panel-raised);
}

.ess-tag.ess-tag-fault {
  color: var(--ess-amber);
  border-color: #5A4420;
  background: #382D18;
}

.ess-schematic {
  width: 100%;
  height: auto;
  background: var(--ess-panel-raised);
  border: 1px solid var(--ess-border);
  border-radius: 8px;
  padding: 10px;
}

.ess-schematic svg { width: 100%; height: auto; display: block; }

.ess-meter {
  background: #10151A;
  border: 1px solid var(--ess-border);
  border-radius: 8px;
  padding: 18px 20px;
  margin-bottom: 18px;
  text-align: center;
}

.ess-meter-label {
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ess-text-dim);
  margin-bottom: 6px;
}

.ess-meter-value {
  font-family: var(--ess-mono);
  font-size: 40px;
  font-weight: 600;
  color: var(--ess-green);
  letter-spacing: 0.02em;
  transition: opacity 0.15s ease;
}

.ess-meter-value.ess-settling {
  opacity: 0.35;
}

.ess-meter-unit {
  font-family: var(--ess-mono);
  font-size: 14px;
  color: var(--ess-text-dim);
  margin-left: 6px;
}

.ess-controls {
  display: flex;
  gap: 10px;
  margin-bottom: 14px;
}

.ess-btn {
  font-family: var(--ess-sans);
  font-size: 13.5px;
  font-weight: 600;
  padding: 10px 16px;
  border-radius: 6px;
  border: 1px solid var(--ess-border);
  background: var(--ess-panel-raised);
  color: var(--ess-text);
  cursor: pointer;
  flex: 1;
  transition: background 0.12s ease, border-color 0.12s ease, transform 0.05s ease;
}

.ess-btn:hover { background: #313C46; border-color: #4A5A68; }
.ess-btn:active { transform: translateY(1px); }
.ess-btn:disabled { opacity: 0.4; cursor: not-allowed; }

.ess-btn-pass {
  border-color: var(--ess-green-dim);
}
.ess-btn-pass:hover { background: var(--ess-green-dim); }

.ess-btn-fail {
  border-color: var(--ess-red-dim);
}
.ess-btn-fail:hover { background: var(--ess-red-dim); }

.ess-btn-na {
  border-color: #3A4A5A;
  color: var(--ess-blue);
}
.ess-btn-na:hover { background: #26323C; }

.ess-meter-value.ess-meter-ol {
  color: var(--ess-amber);
}

.ess-btn-primary {
  background: var(--ess-blue);
  border-color: var(--ess-blue);
  color: #0E1A24;
}
.ess-btn-primary:hover { background: #6BB0F0; }

.ess-feedback {
  border-radius: 8px;
  padding: 14px 16px;
  margin-top: 12px;
  border: 1px solid var(--ess-border);
  font-size: 13.5px;
  line-height: 1.6;
  display: none;
}

.ess-feedback.ess-show { display: block; }

.ess-feedback.ess-correct {
  background: var(--ess-green-dim);
  border-color: #3E6350;
  color: #CFF3DD;
}

.ess-feedback.ess-incorrect {
  background: var(--ess-red-dim);
  border-color: #6B3336;
  color: #F5D2D3;
}

.ess-feedback .ess-feedback-head {
  font-weight: 700;
  font-family: var(--ess-mono);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-size: 12px;
  margin-bottom: 6px;
  display: block;
}

.ess-limit-ref {
  font-family: var(--ess-mono);
  font-size: 12.5px;
  color: var(--ess-text-dim);
  background: var(--ess-panel-raised);
  border: 1px solid var(--ess-border);
  border-radius: 6px;
  padding: 10px 12px;
  margin-top: 10px;
}

.ess-limit-ref .ess-limit-value {
  color: var(--ess-text);
  font-weight: 600;
}

.ess-footer {
  padding: 12px 20px;
  border-top: 1px solid var(--ess-border);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.ess-next-btn {
  font-family: var(--ess-sans);
  font-size: 13px;
  font-weight: 700;
  padding: 9px 18px;
  border-radius: 6px;
  border: none;
  background: var(--ess-blue);
  color: #0E1A24;
  cursor: pointer;
  visibility: hidden;
}

.ess-next-btn.ess-visible { visibility: visible; }
.ess-next-btn:hover { background: #6BB0F0; }

.ess-disclaimer {
  font-size: 11px;
  color: var(--ess-text-dim);
  max-width: 480px;
  line-height: 1.5;
}

.ess-summary {
  padding: 40px 30px;
  text-align: center;
}

.ess-start {
  padding: 50px 30px;
  text-align: center;
}

.ess-start-label {
  display: block;
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ess-text-dim);
  margin: 14px 0 8px;
}

.ess-rounds-select {
  font-family: var(--ess-sans);
  font-size: 15px;
  font-weight: 600;
  padding: 8px 14px;
  border-radius: 6px;
  border: 1px solid var(--ess-border);
  background: var(--ess-panel-raised);
  color: var(--ess-text);
  min-width: 180px;
}

.ess-start-note {
  font-size: 12px;
  color: var(--ess-text-dim);
  margin-top: 10px;
}

.ess-summary .ess-summary-score {
  font-family: var(--ess-mono);
  font-size: 52px;
  font-weight: 700;
  color: var(--ess-green);
  margin: 10px 0;
}

.ess-summary .ess-summary-label {
  font-size: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ess-text-dim);
}

.ess-summary .ess-summary-note {
  font-size: 14px;
  color: var(--ess-text-dim);
  margin: 16px 0 24px;
  max-width: 520px;
  margin-left: auto;
  margin-right: auto;
  line-height: 1.6;
}

.ess-score-save {
  margin: 4px 0 8px;
  min-height: 20px;
}

.ess-login-prompt {
  font-size: 13px;
  color: var(--ess-text-dim);
}

.ess-login-prompt a {
  color: var(--ess-blue);
  text-decoration: underline;
}

.ess-leaderboard {
  max-width: 420px;
  margin: 28px auto 0;
  text-align: left;
  border-top: 1px solid var(--ess-border);
  padding-top: 18px;
}

.ess-leaderboard-label {
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ess-text-dim);
  margin-bottom: 8px;
  text-align: center;
}

.ess-leaderboard-table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--ess-mono);
  font-size: 12.5px;
}

.ess-leaderboard-table td {
  padding: 5px 8px;
  border-bottom: 1px solid var(--ess-border);
  color: var(--ess-text);
}

.ess-leaderboard-table tr:first-child td {
  color: var(--ess-text-dim);
  font-weight: 600;
  text-transform: uppercase;
  font-size: 10px;
  letter-spacing: 0.05em;
  border-bottom: 1px solid var(--ess-border);
}

.ess-leaderboard-table tr:nth-child(2) td {
  color: var(--ess-green);
  font-weight: 700;
}

.ess-leaderboard-table td:first-child {
  color: var(--ess-text-dim);
  width: 24px;
}

.ess-leaderboard-note {
  font-size: 11px;
  color: var(--ess-text-dim);
  margin-top: 8px;
  text-align: center;
}

.ess-current-path {
  stroke: var(--ess-blue);
  stroke-width: 2.5;
  fill: none;
  stroke-dasharray: 6 4;
  animation: ess-flow 1s linear infinite;
}

.ess-current-path.ess-fault-path {
  stroke: var(--ess-amber);
}

@keyframes ess-flow {
  to { stroke-dashoffset: -20; }
}

@media (prefers-reduced-motion: reduce) {
  .ess-current-path { animation: none; }
  .ess-meter-value { transition: none; }
}

.ess-sim-root :focus-visible {
  outline: 2px solid var(--ess-blue);
  outline-offset: 2px;
}