.panel, .metric-card {
  border: 1px solid var(--border);
  background: linear-gradient(145deg, var(--surface-glass), var(--surface));
  box-shadow: var(--shadow);
}
.panel { padding: 20px; border-radius: 15px; }
.section-heading { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.section-heading h2 { margin: 0; font-size: 17px; line-height: 1.2; letter-spacing: -.4px; }
.section-heading .eyebrow { margin-bottom: 6px; }
.compact-heading h2 { font-size: 15px; }
.heading-icon { color: var(--cyan); font-size: 21px; line-height: 1; }
.panel-note { color: var(--text-soft); font-size: 11px; line-height: 1.7; }
.controls-panel .panel-note { margin: 11px 0 19px; }

.control { padding: 11px 0 13px; border-bottom: 1px solid var(--border); }
.control-label { display: flex; justify-content: space-between; align-items: baseline; gap: 8px; margin-bottom: 6px; }
.control-label label { color: var(--text); font-size: 11px; font-weight: 600; }
.control-label output { color: var(--cyan); font: 500 14px "DM Mono", monospace; white-space: nowrap; }
.control-label output small { color: var(--text-faint); font: 10px "DM Mono", monospace; }
input[type="range"] { width: 100%; height: 48px; margin: 0; appearance: none; background: transparent; cursor: pointer; touch-action: pan-y; }
input[type="range"]::-webkit-slider-runnable-track { height: 4px; border-radius: 4px; background: linear-gradient(to right, var(--cyan) 0 var(--range-progress, 50%), var(--border-strong) var(--range-progress, 50%) 100%); }
input[type="range"]::-moz-range-track { height: 4px; border-radius: 4px; background: var(--border-strong); }
input[type="range"]::-moz-range-progress { height: 4px; background: var(--cyan); border-radius: 4px; }
input[type="range"]::-webkit-slider-thumb { width: 44px; height: 44px; margin-top: -20px; appearance: none; border: 0; background: radial-gradient(circle, var(--cyan) 0 7px, var(--surface) 7.5px 10px, transparent 10.5px); }
input[type="range"]::-moz-range-thumb { width: 44px; height: 44px; border: 0; background: radial-gradient(circle, var(--cyan) 0 7px, var(--surface) 7.5px 10px, transparent 10.5px); }
.range-scale { display: flex; align-items: center; justify-content: space-between; color: var(--text-faint); font-size: 8px; }
.quick-set { min-height: 28px; padding: 0 8px; color: var(--cyan); background: var(--cyan-soft); border: 0; border-radius: 6px; font: 8px "DM Mono", monospace; letter-spacing: .3px; }
.control-actions { display: flex; gap: 9px; padding-top: 17px; }
.button { min-height: 40px; flex: 1; display: inline-flex; align-items: center; justify-content: center; gap: 8px; border: 1px solid var(--border-strong); border-radius: 9px; font-size: 11px; font-weight: 700; }
.button span { font-size: 15px; }
.button-quiet { color: var(--text-soft); background: transparent; }
.button-quiet:hover { background: var(--surface-raised); color: var(--text); }
.button-accent { color: #0b191d; background: var(--cyan); border-color: var(--cyan); }
.button-accent:hover { filter: brightness(1.07); }

.metrics-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; }
.metric-card { min-width: 0; min-height: 116px; padding: 14px 15px 11px; border-radius: 13px; }
.metric-top { display: flex; align-items: center; gap: 7px; }
.metric-icon { width: 19px; height: 19px; display: grid; place-items: center; color: var(--cyan); background: var(--cyan-soft); border-radius: 6px; font-size: 13px; }
.metric-efficiency .metric-icon { color: var(--amber); background: var(--amber-soft); }
.metric-quality .metric-icon { color: var(--green); background: var(--green-soft); }
.metric-label { overflow: hidden; color: var(--text-faint); font-size: 8px; letter-spacing: .65px; white-space: nowrap; text-overflow: ellipsis; }
.metric-value { display: flex; align-items: baseline; gap: 5px; margin-top: 10px; font: 500 clamp(23px, 2.1vw, 30px) "DM Mono", monospace; letter-spacing: -1.4px; }
.metric-value small { color: var(--text-faint); font: 9px "DM Mono", monospace; letter-spacing: 0; }
.metric-foot { display: flex; align-items: center; gap: 6px; margin-top: 5px; color: var(--text-faint); font-size: 9px; }
.trend-arrow { color: var(--green); }
.metric-dot, .legend-dot { width: 6px; height: 6px; display: inline-block; border-radius: 50%; background: var(--amber); }
.dot-cyan { background: var(--cyan); }
.status-pill { padding: 2px 6px; color: var(--green); background: var(--green-soft); border-radius: 20px; font: 8px "DM Mono", monospace; letter-spacing: .5px; }
.status-pill.is-amber { color: var(--amber); background: var(--amber-soft); }
.status-pill.is-red { color: var(--red); background: var(--red-soft); }

.turbine-panel { margin-top: 10px; padding-bottom: 13px; }
.live-label { display: flex; align-items: center; gap: 6px; color: var(--green); font-size: 8px; letter-spacing: .9px; }
.turbine-stage { position: relative; height: clamp(160px, 18vw, 210px); margin: 6px -4px 0; overflow: hidden; }
#turbine-canvas { width: 100%; height: 100%; display: block; }
.turbine-overlay { position: absolute; top: 47%; display: flex; align-items: center; gap: 5px; color: var(--text-faint); font: 7px "DM Mono", monospace; letter-spacing: .5px; }
.turbine-inlet { left: 0; }
.turbine-outlet { right: 0; flex-direction: row-reverse; }
.turbine-overlay i { width: 15px; height: 1px; background: var(--cyan); opacity: .7; }
.turbine-caption { position: absolute; left: 50%; bottom: 9px; display: flex; gap: 13px; transform: translateX(-50%); color: var(--text-faint); font: 8px "DM Mono", monospace; white-space: nowrap; letter-spacing: .8px; }
.turbine-caption span:last-child { color: var(--cyan); }
.turbine-foot { display: flex; justify-content: space-between; align-items: center; padding-top: 9px; border-top: 1px solid var(--border); color: var(--text-faint); font-size: 9px; }
.signal-bars { display: flex; align-items: flex-end; gap: 2px; height: 12px; }
.signal-bars i { width: 3px; height: 5px; background: var(--cyan); border-radius: 2px; opacity: .7; }
.signal-bars i:nth-child(2) { height: 8px; }.signal-bars i:nth-child(3) { height: 10px; }.signal-bars i:nth-child(4) { height: 12px; }
.warning-banner { margin: 0 0 10px; padding: 9px 11px; border: 1px solid color-mix(in srgb, var(--red) 35%, transparent); border-radius: 8px; color: var(--red); background: var(--red-soft); font-size: 10px; animation: warning-in .2s ease-out; }
@keyframes warning-in { from { opacity: 0; transform: translateY(-4px); } to { opacity: 1; transform: translateY(0); } }

.presets-panel { margin-top: 10px; }
.small-muted { color: var(--text-faint); font-size: 8px; letter-spacing: .5px; }
.preset-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 8px; margin-top: 15px; }
.preset-card { min-width: 0; min-height: 52px; display: flex; align-items: center; gap: 9px; padding: 8px; text-align: left; background: var(--surface-raised); border: 1px solid var(--border); border-radius: 9px; transition: border-color .15s, background .15s; }
.preset-card:hover, .preset-card.is-active { border-color: var(--cyan); background: var(--cyan-soft); }
.preset-icon { width: 28px; height: 28px; flex: 0 0 auto; display: grid; place-items: center; border-radius: 8px; color: var(--amber); background: var(--amber-soft); font-size: 16px; }
.preset-nuclear { color: var(--cyan); background: var(--cyan-soft); }.preset-solar { color: #f0c46b; background: var(--amber-soft); }.preset-geothermal { color: var(--red); background: var(--red-soft); }
.preset-card strong, .preset-card small { display: block; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.preset-card strong { font-size: 9px; font-weight: 700; }
.preset-card small { margin-top: 2px; color: var(--text-faint); font-size: 8px; }

.chart-panel { padding: 18px 17px 15px; }
.chart-subtitle { margin: 8px 0 0; color: var(--text-faint); font-size: 9px; }
.chart-wrap { width: 100%; }
.efficiency-chart { margin-top: 5px; }
.efficiency-chart svg { width: 100%; height: auto; overflow: visible; }
.chart-legend { display: flex; flex-wrap: wrap; gap: 15px; color: var(--text-faint); font-size: 8px; }
.chart-legend span { display: flex; align-items: center; gap: 5px; }
.legend-line { width: 14px; height: 2px; background: var(--cyan); }
.legend-ghost { background: var(--amber); }
.chart-insight { margin: 12px 0 0; padding: 8px 10px; border-left: 2px solid var(--cyan); color: var(--text-soft); background: var(--cyan-soft); font-size: 9px; }
.compare-button { min-height: 30px; padding: 0 9px; color: var(--text-soft); background: transparent; border: 1px solid var(--border-strong); border-radius: 7px; font-size: 9px; }
.compare-button[aria-pressed="true"] { color: var(--amber); border-color: var(--amber); background: var(--amber-soft); }
.diagram-panel { margin-top: 10px; }
.chart-tabs { display: flex; gap: 5px; margin-top: 13px; padding: 3px; background: var(--surface-raised); border-radius: 8px; }
.chart-tab { min-width: 44px; min-height: 31px; padding: 3px 11px; color: var(--text-faint); background: transparent; border: 0; border-radius: 6px; font: 10px "DM Mono", monospace; }
.chart-tab.is-active { color: var(--cyan); background: var(--cyan-soft); }
.cycle-chart { margin-top: 4px; }
.cycle-chart svg { width: 100%; height: auto; }
.diagram-caption { display: flex; align-items: center; gap: 7px; color: var(--text-faint); font-size: 9px; }
.diagram-caption .legend-dot { background: var(--cyan); }

.lower-grid { display: grid; grid-template-columns: minmax(0, 1.65fr) minmax(280px, 1fr); gap: 10px; margin-top: 10px; }
.sankey-panel .panel-note, .learn-panel .panel-note { margin: 9px 0 8px; }
.balance-tag { display: flex; align-items: center; gap: 5px; color: var(--green); font: 8px "DM Mono", monospace; letter-spacing: .6px; }
.balance-check { width: 16px; height: 16px; display: grid; place-items: center; border-radius: 50%; background: var(--green-soft); font-size: 10px; }
.sankey-scroll { width: 100%; overflow: hidden; }
.sankey-scroll svg { width: 100%; height: auto; }
.sankey-flow { fill: none; stroke-linecap: butt; opacity: .42; transition: opacity .18s, stroke-width .3s; cursor: pointer; }
.sankey-flow:hover, .sankey-flow.is-selected { opacity: .95; }
.sankey-label { fill: var(--text-soft); font: 10px "Manrope", sans-serif; }
.sankey-value { fill: var(--text-faint); font: 9px "DM Mono", monospace; }
.sankey-node { fill: var(--surface-raised); stroke: var(--border-strong); }
.sankey-tooltip { min-height: 30px; padding: 8px 10px; color: var(--text-soft); background: var(--surface-raised); border: 1px solid var(--border); border-radius: 7px; font-size: 9px; }
.energy-total { display: flex; justify-content: space-between; align-items: center; gap: 8px; margin-top: 12px; padding-top: 11px; border-top: 1px solid var(--border); color: var(--text-faint); font-size: 8px; letter-spacing: .5px; }
.energy-total strong { color: var(--amber); font-size: 12px; font-weight: 500; letter-spacing: 0; }
.energy-total small { color: var(--text-faint); font-size: 8px; }
.explanation { min-height: 73px; margin: 13px 0 10px; color: var(--text-soft); font-size: 11px; line-height: 1.75; }
.learn-details { padding-top: 11px; border-top: 1px solid var(--border); color: var(--text-soft); font-size: 10px; line-height: 1.65; }
.learn-details summary { min-height: 30px; color: var(--text); cursor: pointer; font-weight: 600; }
.learn-details p { margin: 6px 0 0; }
.model-note { display: flex; gap: 7px; margin-top: 13px; color: var(--text-faint); font-size: 8px; line-height: 1.6; }
.model-note span, .model-note a { color: var(--cyan); }
.model-note a { text-decoration: underline; text-underline-offset: 2px; }

.mobile-results { display: none; }

@media (max-width: 639px) {
  .panel { padding: 17px 15px; border-radius: 13px; }
  .metric-card { min-height: 106px; padding: 12px 11px 9px; }
  .metric-value { margin-top: 8px; font-size: 25px; }
  .metric-label { font-size: 7px; letter-spacing: .35px; }
  .metric-foot { font-size: 8px; }
  .controls-panel .panel-note { margin-bottom: 12px; }
  .control { padding: 9px 0 10px; }
  .control-label label { font-size: 12px; }
  .control-label output { font-size: 14px; }
  input[type="range"] { height: 48px; }
  .range-scale { font-size: 8px; }
  .quick-set { min-height: 30px; }
  .mobile-results { position: fixed; z-index: 25; right: 0; bottom: 0; left: 0; min-height: 58px; display: flex; align-items: center; justify-content: center; gap: 12px; padding: 8px 14px calc(8px + env(safe-area-inset-bottom)); border-top: 1px solid var(--border-strong); background: var(--surface-glass); backdrop-filter: blur(18px); }
  .mobile-results > span { color: var(--text-faint); font: 8px "DM Mono", monospace; letter-spacing: .7px; }
  .mobile-results strong { color: var(--text-soft); font: 9px "DM Mono", monospace; }
  .mobile-results strong b { color: var(--cyan); font-size: 13px; font-weight: 500; }
  .mobile-results > i { height: 17px; border-left: 1px solid var(--border-strong); }
  .sim-grid .efficiency-panel { display: none; }
  .sankey-scroll { overflow-x: hidden; }
  .energy-total { font-size: 7px; }
}