:root {
  --purple-950: #24135f;
  --purple-900: #342078;
  --purple-800: #46309b;
  --purple-700: #5b3fd6;
  --purple-600: #7158e8;
  --purple-200: #d9d1ff;
  --purple-100: #eeeaff;
  --purple-50: #f7f5ff;
  --blue-700: #1769aa;
  --blue-100: #dff1ff;
  --green-700: #167052;
  --green-100: #def7ec;
  --orange-700: #b85016;
  --orange-100: #fff0dc;
  --red-700: #b8304f;
  --red-100: #ffe5ec;
  --ink: #1d2340;
  --muted: #68708f;
  --line: #d8dcef;
  --surface: #ffffff;
  --backdrop: #eef0fb;
  --shadow: 0 10px 28px rgba(44, 37, 91, 0.10);
  --shadow-soft: 0 4px 14px rgba(44, 37, 91, 0.08);
  --radius: 18px;
  --focus: 0 0 0 3px rgba(113, 88, 232, 0.28);
}

* {
  box-sizing: border-box;
}

html {
  color-scheme: light;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-width: 320px;
  min-height: 100vh;
  overflow-x: hidden;
  background:
    radial-gradient(circle at 15% -15%, rgba(217, 209, 255, 0.8), transparent 36rem),
    linear-gradient(180deg, #f5f6ff 0%, var(--backdrop) 100%);
  color: var(--ink);
  font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}

button,
input,
select {
  font: inherit;
}

button,
select,
input[type="range"],
input[type="checkbox"] {
  cursor: pointer;
}

button:focus-visible,
select:focus-visible,
input:focus-visible {
  outline: none;
  box-shadow: var(--focus);
}

.app-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  min-height: 68px;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 10px clamp(14px, 3vw, 34px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.4);
  background: linear-gradient(110deg, var(--purple-950), var(--purple-700));
  color: #fff;
  box-shadow: 0 5px 20px rgba(36, 19, 95, 0.22);
}

.brand {
  display: flex;
  min-width: 0;
  align-items: center;
  gap: 12px;
}

.brand-mark {
  display: grid;
  width: 42px;
  height: 42px;
  flex: 0 0 42px;
  place-items: center;
  border: 2px solid rgba(255, 255, 255, 0.78);
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.12);
  box-shadow: inset 0 0 0 4px rgba(255, 255, 255, 0.07);
  font-size: 22px;
  font-weight: 900;
  letter-spacing: -0.08em;
}

.brand-copy {
  min-width: 0;
}

.brand-name {
  margin: 0;
  font-size: clamp(17px, 2vw, 22px);
  font-weight: 800;
  letter-spacing: -0.025em;
  line-height: 1.1;
}

.brand-subtitle {
  margin: 4px 0 0;
  color: rgba(255, 255, 255, 0.74);
  font-size: 11px;
  font-weight: 650;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 9px;
}

.status-pill,
.header-button {
  display: inline-flex;
  min-height: 38px;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border: 1px solid rgba(255, 255, 255, 0.25);
  border-radius: 11px;
  background: rgba(255, 255, 255, 0.10);
  color: #fff;
  font-size: 12px;
  font-weight: 750;
}

.status-pill {
  padding: 0 12px;
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #61e8ae;
  box-shadow: 0 0 0 4px rgba(97, 232, 174, 0.15);
}

.header-button {
  padding: 0 13px;
}

.header-button:hover {
  background: rgba(255, 255, 255, 0.18);
}

.app-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 350px;
  gap: 16px;
  width: min(1600px, 100%);
  margin: 0 auto;
  padding: 16px clamp(10px, 2vw, 24px) 28px;
}

.laboratory,
.control-panel,
.experiment-card {
  border: 1px solid rgba(209, 214, 235, 0.95);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow);
}

.laboratory {
  min-width: 0;
  overflow: hidden;
}

.lab-toolbar {
  display: flex;
  min-height: 52px;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 8px 13px 8px 16px;
  border-bottom: 1px solid var(--line);
  background: linear-gradient(180deg, #fff, #fafaff);
}

.toolbar-copy {
  min-width: 0;
}

.toolbar-title {
  margin: 0;
  font-size: 14px;
  font-weight: 800;
}

.toolbar-hint {
  margin: 3px 0 0;
  color: var(--muted);
  font-size: 11px;
}

.preset-row {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 6px;
  overflow-x: auto;
  scrollbar-width: none;
}

.preset-row::-webkit-scrollbar {
  display: none;
}

.preset-button {
  min-height: 32px;
  flex: 0 0 auto;
  padding: 0 10px;
  border: 1px solid #d7d9ea;
  border-radius: 9px;
  background: #fff;
  color: #4c5270;
  font-size: 11px;
  font-weight: 750;
}

.preset-button:hover,
.preset-button.active {
  border-color: var(--purple-600);
  background: var(--purple-100);
  color: var(--purple-900);
}

.simulation-stage {
  position: relative;
  height: clamp(450px, 62vh, 670px);
  min-height: 450px;
  overflow: hidden;
  background:
    linear-gradient(rgba(91, 63, 214, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(91, 63, 214, 0.035) 1px, transparent 1px),
    linear-gradient(180deg, #f9fbff 0%, #edf5ff 73%, #e2e7dc 73.3%, #d7dece 100%);
  background-size: 26px 26px, 26px 26px, auto;
  touch-action: none;
}

#simCanvas {
  display: block;
  width: 100%;
  height: 100%;
}

.stage-badge {
  position: absolute;
  top: 13px;
  left: 14px;
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 7px 10px;
  border: 1px solid rgba(157, 167, 204, 0.62);
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.88);
  box-shadow: var(--shadow-soft);
  color: #4b5474;
  font-size: 11px;
  font-weight: 720;
  pointer-events: none;
  backdrop-filter: blur(8px);
}

.stage-badge strong {
  color: var(--purple-800);
}

.tool-rail {
  position: absolute;
  top: 56px;
  left: 13px;
  display: flex;
  flex-direction: column;
  gap: 7px;
}

.tool-button {
  display: grid;
  width: 42px;
  height: 42px;
  place-items: center;
  border: 1px solid #cfd5e8;
  border-radius: 11px;
  background: rgba(255, 255, 255, 0.94);
  box-shadow: var(--shadow-soft);
  color: #5c6483;
  font-size: 10px;
  font-weight: 850;
  line-height: 1;
}

.tool-button:hover,
.tool-button.active {
  border-color: var(--purple-600);
  background: var(--purple-700);
  color: #fff;
  transform: translateY(-1px);
}

.stopwatch {
  position: absolute;
  top: 14px;
  right: 14px;
  width: 178px;
  overflow: hidden;
  border: 1px solid #cdd2e3;
  border-radius: 13px;
  background: rgba(255, 255, 255, 0.94);
  box-shadow: var(--shadow-soft);
  backdrop-filter: blur(8px);
}

.stopwatch-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 7px 9px;
  background: #f2f0ff;
  color: var(--purple-900);
  font-size: 10px;
  font-weight: 850;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.stopwatch-time {
  display: block;
  padding: 9px 8px 6px;
  font-variant-numeric: tabular-nums;
  font-size: 25px;
  font-weight: 850;
  letter-spacing: 0.045em;
  text-align: center;
}

.stopwatch-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6px;
  padding: 0 8px 8px;
}

.mini-button {
  min-height: 29px;
  border: 1px solid #d1d6e8;
  border-radius: 8px;
  background: #fff;
  color: #525a78;
  font-size: 10px;
  font-weight: 800;
}

.mini-button.primary {
  border-color: var(--purple-600);
  background: var(--purple-700);
  color: #fff;
}

.transport {
  position: absolute;
  right: 50%;
  bottom: 14px;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px;
  border: 1px solid rgba(196, 202, 224, 0.9);
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.94);
  box-shadow: var(--shadow);
  transform: translateX(50%);
  backdrop-filter: blur(8px);
}

.transport-button {
  display: grid;
  width: 39px;
  height: 39px;
  place-items: center;
  border: 1px solid #d3d7e9;
  border-radius: 11px;
  background: #fff;
  color: #505877;
}

.transport-button:hover {
  border-color: var(--purple-600);
  color: var(--purple-700);
}

.transport-button.primary {
  width: 49px;
  height: 49px;
  border-color: var(--purple-700);
  border-radius: 50%;
  background: linear-gradient(145deg, var(--purple-600), var(--purple-800));
  color: #fff;
  box-shadow: 0 6px 16px rgba(91, 63, 214, 0.26);
}

.play-icon {
  width: 0;
  height: 0;
  margin-left: 3px;
  border-top: 7px solid transparent;
  border-bottom: 7px solid transparent;
  border-left: 11px solid currentColor;
}

.pause-icon {
  display: flex;
  gap: 4px;
}

.pause-icon::before,
.pause-icon::after {
  width: 4px;
  height: 15px;
  border-radius: 2px;
  background: currentColor;
  content: "";
}

.reset-icon {
  width: 16px;
  height: 16px;
  border: 2px solid currentColor;
  border-left-color: transparent;
  border-radius: 50%;
  transform: rotate(-30deg);
}

.reset-icon::after {
  position: absolute;
  width: 0;
  height: 0;
  margin: -3px 0 0 -4px;
  border-top: 4px solid transparent;
  border-right: 6px solid currentColor;
  border-bottom: 4px solid transparent;
  content: "";
}

.speed-toggle {
  display: flex;
  gap: 3px;
  padding: 3px;
  border-radius: 9px;
  background: #eceef7;
}

.speed-button {
  min-height: 31px;
  padding: 0 9px;
  border: 0;
  border-radius: 7px;
  background: transparent;
  color: #6a718d;
  font-size: 10px;
  font-weight: 850;
}

.speed-button.active {
  background: #fff;
  color: var(--purple-800);
  box-shadow: 0 2px 6px rgba(61, 54, 100, 0.12);
}

.metrics-strip {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  border-top: 1px solid var(--line);
  background: #fff;
}

.metric {
  min-width: 0;
  padding: 12px 13px;
  border-right: 1px solid var(--line);
}

.metric:last-child {
  border-right: 0;
}

.metric-label {
  display: block;
  overflow: hidden;
  margin-bottom: 5px;
  color: var(--muted);
  font-size: 9px;
  font-weight: 800;
  letter-spacing: 0.06em;
  text-overflow: ellipsis;
  text-transform: uppercase;
  white-space: nowrap;
}

.metric-value {
  display: block;
  overflow: hidden;
  color: var(--ink);
  font-variant-numeric: tabular-nums;
  font-size: clamp(15px, 1.6vw, 20px);
  font-weight: 850;
  letter-spacing: -0.02em;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.metric-value.purple {
  color: var(--purple-700);
}

.control-panel {
  align-self: start;
  overflow: hidden;
}

.panel-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 52px;
  padding: 10px 14px 9px 17px;
  border-bottom: 1px solid var(--line);
  background: linear-gradient(180deg, #fff, #fafaff);
}

.panel-heading h2 {
  margin: 0;
  font-size: 15px;
  font-weight: 850;
}

.panel-heading span {
  color: var(--muted);
  font-size: 10px;
  font-weight: 700;
}

.panel-tabs {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 4px;
  padding: 7px;
  border-bottom: 1px solid var(--line);
  background: #f3f4fa;
}

.panel-tab {
  min-height: 36px;
  border: 0;
  border-radius: 9px;
  background: transparent;
  color: #626986;
  font-size: 11px;
  font-weight: 800;
}

.panel-tab.active {
  background: #fff;
  color: var(--purple-800);
  box-shadow: 0 2px 8px rgba(55, 48, 98, 0.12);
}

.tab-panel {
  display: none;
  max-height: calc(100vh - 160px);
  min-height: 420px;
  overflow-y: auto;
  padding: 15px;
  scrollbar-color: #c8cbe0 transparent;
  scrollbar-width: thin;
}

.tab-panel.active {
  display: block;
}

.control-group + .control-group {
  margin-top: 17px;
  padding-top: 16px;
  border-top: 1px solid #eceefa;
}

.control-title {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 8px;
}

.control-title label,
.control-title span:first-child {
  color: #414866;
  font-size: 12px;
  font-weight: 800;
}

.control-readout {
  min-width: 74px;
  padding: 4px 7px;
  border: 1px solid var(--purple-200);
  border-radius: 7px;
  background: var(--purple-50);
  color: var(--purple-800);
  font-variant-numeric: tabular-nums;
  font-size: 11px;
  font-weight: 850;
  text-align: center;
}

.range {
  width: 100%;
  height: 6px;
  margin: 7px 0 5px;
  border-radius: 99px;
  background: linear-gradient(90deg, var(--purple-600) var(--range-progress, 50%), #dfe2ef var(--range-progress, 50%));
  appearance: none;
}

.range::-webkit-slider-thumb {
  width: 20px;
  height: 20px;
  border: 3px solid #fff;
  border-radius: 50%;
  background: var(--purple-700);
  box-shadow: 0 1px 5px rgba(46, 37, 94, 0.35);
  appearance: none;
}

.range::-moz-range-thumb {
  width: 15px;
  height: 15px;
  border: 3px solid #fff;
  border-radius: 50%;
  background: var(--purple-700);
  box-shadow: 0 1px 5px rgba(46, 37, 94, 0.35);
}

.range-limits,
.control-note {
  display: flex;
  justify-content: space-between;
  color: #858ba3;
  font-size: 9px;
  font-weight: 650;
}

.control-note {
  display: block;
  margin: 7px 0 0;
  line-height: 1.45;
}

.select {
  width: 100%;
  min-height: 39px;
  padding: 0 10px;
  border: 1px solid #d4d8e8;
  border-radius: 9px;
  background: #fff;
  color: #444b68;
  font-size: 11px;
  font-weight: 750;
}

.gravity-row {
  display: grid;
  grid-template-columns: 1fr 82px;
  gap: 8px;
}

.number-input {
  width: 100%;
  min-height: 39px;
  padding: 0 8px;
  border: 1px solid #d4d8e8;
  border-radius: 9px;
  color: var(--purple-800);
  font-variant-numeric: tabular-nums;
  font-size: 11px;
  font-weight: 800;
  text-align: center;
}

.switch-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

.switch-card {
  position: relative;
  display: flex;
  min-height: 45px;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 8px 9px 8px 10px;
  border: 1px solid #dce0ed;
  border-radius: 10px;
  background: #fff;
  color: #4f5674;
  font-size: 10px;
  font-weight: 760;
}

.switch-card input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.switch-ui {
  position: relative;
  width: 31px;
  height: 18px;
  flex: 0 0 31px;
  border-radius: 99px;
  background: #cfd3e2;
  transition: background 0.2s ease;
}

.switch-ui::after {
  position: absolute;
  top: 3px;
  left: 3px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: #fff;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.2);
  content: "";
  transition: transform 0.2s ease;
}

.switch-card input:checked + .switch-ui {
  background: var(--purple-700);
}

.switch-card input:checked + .switch-ui::after {
  transform: translateX(13px);
}

.switch-card:has(input:checked) {
  border-color: var(--purple-200);
  background: var(--purple-50);
  color: var(--purple-900);
}

.theory-card,
.measurement-card,
.insight-card {
  padding: 12px;
  border-radius: 11px;
}

.theory-card {
  border: 1px solid var(--purple-200);
  background: var(--purple-50);
}

.theory-card h3,
.measurement-card h3,
.insight-card h3 {
  margin: 0 0 8px;
  font-size: 11px;
  font-weight: 850;
}

.formula {
  margin: 0;
  color: var(--purple-900);
  font-family: Georgia, "Times New Roman", serif;
  font-size: 22px;
  font-style: italic;
  text-align: center;
}

.formula-caption {
  margin: 7px 0 0;
  color: #727993;
  font-size: 9px;
  line-height: 1.45;
  text-align: center;
}

.measurement-card {
  border: 1px solid #cde7df;
  background: #f0fbf7;
}

.measurement-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 7px;
}

.measurement {
  padding: 8px;
  border: 1px solid rgba(22, 112, 82, 0.15);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.7);
}

.measurement small {
  display: block;
  margin-bottom: 3px;
  color: #6c827b;
  font-size: 8px;
  font-weight: 750;
  text-transform: uppercase;
}

.measurement strong {
  color: var(--green-700);
  font-variant-numeric: tabular-nums;
  font-size: 14px;
}

.insight-card {
  border: 1px solid #f2d6ae;
  background: #fff8eb;
  color: #754218;
}

.insight-card p {
  margin: 0;
  font-size: 10px;
  line-height: 1.5;
}

.chart-toolbar {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 5px;
  margin-bottom: 9px;
}

.chart-button {
  min-height: 32px;
  padding: 0 6px;
  border: 1px solid #d7daea;
  border-radius: 8px;
  background: #fff;
  color: #626985;
  font-size: 9px;
  font-weight: 800;
}

.chart-button.active {
  border-color: var(--purple-600);
  background: var(--purple-700);
  color: #fff;
}

.chart-wrap {
  position: relative;
  overflow: hidden;
  border: 1px solid #d8dceb;
  border-radius: 11px;
  background: #fbfcff;
}

#graphCanvas {
  display: block;
  width: 100%;
  height: 270px;
}

.chart-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 12px;
  margin-top: 9px;
  color: #69708c;
  font-size: 9px;
  font-weight: 750;
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 5px;
}

.legend-swatch {
  width: 16px;
  height: 3px;
  border-radius: 99px;
  background: var(--legend);
}

.experiment-card {
  grid-column: 1 / -1;
  overflow: hidden;
}

.experiment-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 16px;
  border-bottom: 1px solid var(--line);
}

.experiment-title h2 {
  margin: 0;
  font-size: 15px;
  font-weight: 850;
}

.experiment-title p {
  margin: 4px 0 0;
  color: var(--muted);
  font-size: 10px;
}

.experiment-actions {
  display: flex;
  gap: 7px;
}

.action-button {
  min-height: 36px;
  padding: 0 12px;
  border: 1px solid #d2d6e7;
  border-radius: 9px;
  background: #fff;
  color: #525a78;
  font-size: 10px;
  font-weight: 820;
}

.action-button:hover {
  border-color: var(--purple-600);
  color: var(--purple-800);
}

.action-button.primary {
  border-color: var(--purple-700);
  background: var(--purple-700);
  color: #fff;
}

.table-scroll {
  overflow-x: auto;
}

.data-table {
  width: 100%;
  min-width: 850px;
  border-collapse: collapse;
}

.data-table th,
.data-table td {
  padding: 10px 12px;
  border-bottom: 1px solid #eceef6;
  font-size: 10px;
  text-align: right;
  white-space: nowrap;
}

.data-table th {
  background: #f7f7fc;
  color: #69708a;
  font-weight: 820;
  letter-spacing: 0.03em;
  text-transform: uppercase;
}

.data-table th:first-child,
.data-table td:first-child {
  text-align: center;
}

.data-table tbody tr:hover {
  background: var(--purple-50);
}

.empty-row td {
  padding: 22px;
  color: #858ba4;
  text-align: center;
}

.footer-note {
  grid-column: 1 / -1;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 1px 4px;
  color: #737a96;
  font-size: 10px;
}

.footer-note strong {
  color: var(--purple-800);
}

.modal-backdrop {
  position: fixed;
  z-index: 100;
  inset: 0;
  display: none;
  place-items: center;
  padding: 18px;
  background: rgba(22, 18, 50, 0.56);
  backdrop-filter: blur(5px);
}

.modal-backdrop.open {
  display: grid;
}

.modal {
  width: min(650px, 100%);
  max-height: min(720px, 90vh);
  overflow-y: auto;
  border: 1px solid rgba(255, 255, 255, 0.25);
  border-radius: 20px;
  background: #fff;
  box-shadow: 0 24px 70px rgba(22, 18, 50, 0.35);
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 17px 18px;
  border-bottom: 1px solid var(--line);
}

.modal-header h2 {
  margin: 0;
  font-size: 18px;
}

.close-button {
  display: grid;
  width: 34px;
  height: 34px;
  place-items: center;
  border: 1px solid #d4d8e8;
  border-radius: 9px;
  background: #fff;
  color: #5b627d;
  font-size: 20px;
  line-height: 1;
}

.modal-body {
  padding: 18px;
}

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

.help-card {
  padding: 13px;
  border: 1px solid #e0e3ef;
  border-radius: 12px;
  background: #fbfbfe;
}

.help-card h3 {
  margin: 0 0 6px;
  color: var(--purple-900);
  font-size: 12px;
}

.help-card p {
  margin: 0;
  color: #656d88;
  font-size: 10px;
  line-height: 1.55;
}

.keyboard-list {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 7px 10px;
  margin-top: 14px;
  font-size: 10px;
}

kbd {
  min-width: 56px;
  padding: 4px 7px;
  border: 1px solid #cfd3e2;
  border-bottom-width: 2px;
  border-radius: 6px;
  background: #f5f6fb;
  color: #464d69;
  font-size: 9px;
  font-weight: 800;
  text-align: center;
}

.toast {
  position: fixed;
  z-index: 130;
  right: 18px;
  bottom: 18px;
  max-width: min(340px, calc(100vw - 36px));
  padding: 11px 14px;
  border: 1px solid var(--purple-200);
  border-radius: 11px;
  background: var(--purple-950);
  color: #fff;
  box-shadow: var(--shadow);
  font-size: 11px;
  font-weight: 720;
  opacity: 0;
  pointer-events: none;
  transform: translateY(14px);
  transition: opacity 0.2s ease, transform 0.2s ease;
}

.toast.show {
  opacity: 1;
  transform: translateY(0);
}

.screen-reader-only {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
}

@media (max-width: 1080px) {
  .app-shell {
    grid-template-columns: 1fr;
  }

  .control-panel {
    order: 2;
  }

  .tab-panel {
    max-height: none;
    min-height: 0;
  }

  .experiment-card {
    order: 3;
  }

  .footer-note {
    order: 4;
  }

  .controls-columns {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0 22px;
  }
}

@media (max-width: 720px) {
  .app-header {
    min-height: 60px;
    padding: 8px 10px;
  }

  .brand-mark {
    width: 38px;
    height: 38px;
    flex-basis: 38px;
    font-size: 19px;
  }

  .brand-subtitle,
  .status-pill {
    display: none;
  }

  .header-button {
    min-height: 36px;
    padding: 0 10px;
  }

  .app-shell {
    gap: 10px;
    padding: 10px 7px 20px;
  }

  .laboratory,
  .control-panel,
  .experiment-card {
    border-radius: 14px;
  }

  .lab-toolbar {
    align-items: flex-start;
    flex-direction: column;
    padding: 10px;
  }

  .preset-row {
    width: 100%;
    justify-content: flex-start;
  }

  .simulation-stage {
    height: 490px;
    min-height: 490px;
  }

  .stopwatch {
    top: 9px;
    right: 8px;
    width: 145px;
  }

  .stopwatch-time {
    padding: 7px 5px 5px;
    font-size: 20px;
  }

  .stopwatch-actions {
    padding: 0 6px 6px;
  }

  .tool-rail {
    top: 49px;
    left: 8px;
  }

  .tool-button {
    width: 38px;
    height: 38px;
  }

  .stage-badge {
    display: none;
  }

  .transport {
    bottom: 9px;
    gap: 5px;
    padding: 6px;
  }

  .transport-button {
    width: 35px;
    height: 35px;
  }

  .transport-button.primary {
    width: 45px;
    height: 45px;
  }

  .speed-button {
    min-height: 29px;
    padding: 0 7px;
  }

  .metrics-strip {
    grid-template-columns: repeat(3, 1fr);
  }

  .metric {
    border-bottom: 1px solid var(--line);
  }

  .metric:nth-child(3) {
    border-right: 0;
  }

  .metric:nth-child(4),
  .metric:nth-child(5) {
    border-bottom: 0;
  }

  .controls-columns {
    display: block;
  }

  .help-grid {
    grid-template-columns: 1fr;
  }

  .experiment-header {
    align-items: flex-start;
    flex-direction: column;
  }

  .experiment-actions {
    width: 100%;
  }

  .action-button {
    flex: 1;
  }

  .footer-note {
    align-items: flex-start;
    flex-direction: column;
    padding: 4px 6px;
  }
}

@media (max-width: 430px) {
  .brand-name {
    max-width: 210px;
    font-size: 15px;
  }

  .header-button span {
    display: none;
  }

  .header-button {
    width: 38px;
    padding: 0;
    font-size: 16px;
  }

  .switch-grid {
    grid-template-columns: 1fr;
  }

  .simulation-stage {
    height: 455px;
    min-height: 455px;
  }

  .speed-toggle {
    display: none;
  }

  .metrics-strip {
    grid-template-columns: repeat(2, 1fr);
  }

  .metric:nth-child(2n) {
    border-right: 0;
  }

  .metric:nth-child(3) {
    border-right: 1px solid var(--line);
  }

  .metric:nth-child(4) {
    border-bottom: 1px solid var(--line);
  }

  .metric:nth-child(5) {
    grid-column: 1 / -1;
    border-right: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}

@media print {
  .app-header,
  .control-panel,
  .transport,
  .tool-rail,
  .stopwatch,
  .experiment-actions,
  .footer-note {
    display: none !important;
  }

  .app-shell {
    display: block;
    padding: 0;
  }

  .laboratory,
  .experiment-card {
    margin-bottom: 12px;
    box-shadow: none;
  }
}