.spring-shell { width: min(1260px, calc(100% - 40px)); }
.spring-hero { grid-template-columns: 1.15fr .85fr; }
.spring-workspace { grid-template-columns: 282px minmax(0, 1fr); }
.spring-stage { padding-bottom: 24px; }
.spring-status { display: flex; flex-wrap: wrap; gap: 8px 20px; margin: 0 0 14px; padding: 11px 13px; border: 1px solid var(--line); color: #c9d8d5; font-size: 12px; line-height: 1.5; }
.spring-status strong { color: var(--orange); font: 500 12px "DM Mono", monospace; }
.spring-views { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 13px; }
.spring-view { min-width: 0; overflow: hidden; border: 1px solid var(--line-soft); background: var(--panel-deep); }
.spring-motion-view { grid-column: 1 / -1; }
.spring-view-head { display: flex; justify-content: space-between; gap: 12px; padding: 10px 12px 8px; border-bottom: 1px solid rgba(41, 66, 71, .7); }
.spring-view-head h3 { margin: 0; font-size: 13px; }
.spring-view-head span { color: var(--muted); font: 10px "DM Mono", monospace; }
.spring-scene { display: block; width: 100%; height: auto; }
.spring-track { stroke: #587471; stroke-width: 2; }
.spring-tick { stroke: #416168; stroke-width: 1; }
.equilibrium-line { stroke: var(--yellow); stroke-width: 1.5; stroke-dasharray: 5 5; }
.spring-equilibrium-label { fill: var(--yellow); font: 10px "DM Mono", monospace; paint-order: stroke; stroke: var(--panel-deep); stroke-width: 4px; }
.spring-coil { fill: none; stroke: var(--cyan); stroke-width: 2.5; stroke-linejoin: round; }
.spring-block { fill: #173238; stroke: var(--orange); stroke-width: 2; filter: drop-shadow(0 4px 7px rgba(0, 0, 0, .38)); }
.spring-force { stroke: var(--red); stroke-width: 2.5; }
.spring-force-label { fill: var(--red); font: 500 11px "DM Mono", monospace; paint-order: stroke; stroke: var(--panel-deep); stroke-width: 5px; }
.spring-amplitude-label { fill: var(--yellow); font: 10px "DM Mono", monospace; paint-order: stroke; stroke: var(--panel-deep); stroke-width: 4px; }
.amplitude-line { stroke: var(--yellow); stroke-width: 1.2; stroke-dasharray: 3 4; }
.graph-scene { min-height: 245px; }
.spring-graph-grid { stroke: #234047; stroke-width: 1; stroke-dasharray: 2 6; }
.spring-graph-axis { stroke: #66817e; stroke-width: 1.15; }
.spring-x-path, .spring-v-path { fill: none; stroke-width: 2.5; }
.spring-x-path { stroke: var(--cyan); }
.spring-v-path { stroke: var(--orange); }
.spring-cursor { stroke: #d9eae7; stroke-width: 1.1; stroke-dasharray: 4 4; opacity: .85; }
.spring-x-point { fill: var(--cyan); stroke: #d8fff6; stroke-width: 1.2; }
.spring-v-point { fill: var(--orange); stroke: #fff1d8; stroke-width: 1.2; }
.spring-energy-view { display: flex; grid-column: 1 / -1; flex-direction: column; }
.energy-panel { display: grid; min-height: 245px; padding: 20px 20px 14px; align-content: center; }
.energy-bars { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; height: 164px; align-items: end; }
.energy-item { display: grid; grid-template-rows: 110px 20px 20px; text-align: center; }
.energy-track { position: relative; width: min(46px, 72%); height: 104px; margin: auto; border: 1px solid #365158; background: #102226; }
.energy-track i { position: absolute; inset: auto 0 0; display: block; height: 0; background: var(--cyan); transition: height .08s linear; }
.energy-item:nth-child(2) i { background: var(--orange); }
.energy-item:nth-child(3) i { background: var(--yellow); }
.energy-item b { color: #dcebe8; font: 500 12px "DM Mono", monospace; }
.energy-item span { color: var(--muted); font: 10px "DM Mono", monospace; white-space: nowrap; }
.energy-panel p { margin: 9px 0 0; color: var(--muted); font-size: 11px; text-align: center; }
.spring-metrics { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.spring-metrics .metric:nth-child(n+4) { margin-top: 13px; padding-top: 17px; border-top: 1px solid var(--line); }
.spring-metrics .metric:nth-child(4) { padding-left: 0; border-left: 0; }
.spring-metrics .metric-value { font-size: 17px; line-height: 1.35; }
.spring-metrics .metric-value.compact { font-size: 13px; }

@media (max-width: 900px) {
  .spring-workspace { grid-template-columns: 260px minmax(0, 1fr); }
}
@media (max-width: 820px) {
  .spring-shell { width: min(calc(100% - 24px), 650px); }
  .spring-hero { grid-template-columns: 1fr; }
  .spring-workspace { grid-template-columns: 1fr; }
  .spring-views { grid-template-columns: 1fr; }
  .spring-motion-view { grid-column: auto; }
  .spring-energy-view { grid-column: auto; }
  .spring-metrics { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .spring-metrics .metric:nth-child(n+3) { margin-top: 13px; padding-top: 17px; border-top: 1px solid var(--line); }
  .spring-metrics .metric:nth-child(odd) { padding-left: 0; border-left: 0; }
}
@media (max-width: 520px) {
  .spring-status { display: block; }
  .spring-status span { display: block; margin-top: 5px; }
  .spring-scene .axis-label, .spring-scene .spring-force-label, .spring-scene .spring-amplitude-label, .spring-scene .spring-equilibrium-label { font-size: 13px; }
  .graph-scene { min-height: 260px; }
  .spring-metrics { grid-template-columns: 1fr; }
  .spring-metrics .metric, .spring-metrics .metric:nth-child(n) { margin-top: 0; padding: 13px 0; border-right: 0; border-bottom: 1px solid var(--line); border-left: 0; }
  .spring-metrics .metric:last-child { border-bottom: 0; }
}