:root {
  --bg: #07111f;
  --panel: rgba(10, 21, 38, 0.82);
  --panel-2: rgba(17, 31, 54, 0.9);
  --line: rgba(255,255,255,0.08);
  --text: #ecf3ff;
  --muted: #93a4c3;
  --accent: #70d6ff;
  --accent-2: #a78bfa;
  --good: #4ade80;
  --warn: #fbbf24;
  --danger: #fb7185;
  --shadow: 0 20px 60px rgba(0,0,0,0.35);
  --soft-glow: 0 0 0 1px rgba(112,214,255,0.18), 0 16px 36px rgba(112,214,255,0.12);
}
* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: Inter, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background:
    radial-gradient(circle at 20% 20%, rgba(103, 80, 255, 0.16), transparent 24%),
    radial-gradient(circle at 80% 10%, rgba(87, 214, 255, 0.14), transparent 22%),
    radial-gradient(circle at 60% 75%, rgba(0, 255, 170, 0.08), transparent 28%),
    linear-gradient(180deg, #06101b 0%, #081627 100%);
  color: var(--text);
  overflow: hidden;
}
button, select, input {
  font: inherit;
}
button, select {
  border: 1px solid rgba(255,255,255,0.08);
  background: rgba(255,255,255,0.06);
  color: var(--text);
  border-radius: 14px;
  padding: 10px 12px;
  cursor: pointer;
  transition: transform .15s ease, background .15s ease, border-color .15s ease, box-shadow .15s ease;
}
button:hover, select:hover {
  transform: translateY(-1px);
  background: rgba(255,255,255,0.1);
  border-color: rgba(255,255,255,0.16);
}
button.primary {
  background: linear-gradient(135deg, rgba(112,214,255,0.22), rgba(167,139,250,0.22));
  border-color: rgba(112,214,255,0.24);
}
button.ghost {
  background: rgba(255,255,255,0.04);
  color: var(--muted);
}
input[type="number"], select {
  width: 100%;
  padding: 10px 12px;
  border-radius: 14px;
  border: 1px solid rgba(255,255,255,0.08);
  background: rgba(255,255,255,0.05);
  color: var(--text);
}
input[type="range"] {
  width: 100%;
}
.app-shell {
  display: grid;
  grid-template-columns: 420px 1fr;
  gap: 16px;
  height: 100vh;
  padding: 16px;
}
.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 24px;
  box-shadow: var(--shadow);
  backdrop-filter: blur(16px);
}
.sidebar {
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: 18px;
  overflow: auto;
}
.hero-block { padding: 4px 2px 8px; }
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 10px;
  border: 1px solid rgba(112,214,255,0.22);
  background: rgba(112,214,255,0.08);
  border-radius: 999px;
  font-size: 12px;
  color: var(--accent);
  margin-bottom: 10px;
}
h1 {
  margin: 0;
  font-size: 28px;
  line-height: 1.15;
  letter-spacing: 0.01em;
}
.subtitle {
  margin: 10px 0 0;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.65;
}
.card {
  background: var(--panel-2);
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: 14px;
}
.section-head {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 12px;
  margin-bottom: 12px;
}
.section-head h2 {
  margin: 0;
  font-size: 15px;
}
.section-tip {
  color: var(--muted);
  font-size: 12px;
  text-align: right;
}
.row {
  display: flex;
  gap: 8px;
}
.wrap { flex-wrap: wrap; }
.control-grid {
  display: grid;
  gap: 10px;
}
.control-grid.two-col { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.control-grid.three-col { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.field-group {
  display: grid;
  gap: 6px;
}
.field-group label {
  font-size: 12px;
  color: var(--muted);
}
.field-compact {
  align-content: end;
}
.angle-chip {
  min-height: 42px;
  display: grid;
  place-items: center;
  border-radius: 14px;
  background: rgba(112,214,255,0.1);
  border: 1px solid rgba(112,214,255,0.18);
  color: var(--accent);
}
.micro-title {
  font-size: 12px;
  color: var(--muted);
  margin-bottom: 8px;
}
.gate-groups {
  display: grid;
  gap: 14px;
}
.gates {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 8px;
}
.gates-two {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}
.gate-btn {
  padding: 12px 6px;
  text-align: center;
  font-weight: 700;
  letter-spacing: 0.03em;
}
.gate-btn small {
  display: block;
  margin-top: 4px;
  font-weight: 500;
  color: var(--muted);
  font-size: 11px;
}
.gate-btn.is-disabled {
  opacity: 0.45;
  cursor: not-allowed;
}
.explain-panel {
  border-radius: 18px;
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.06);
  padding: 14px;
}
.explain-title {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 6px;
}
.explain-formula {
  display: inline-flex;
  padding: 6px 10px;
  border-radius: 999px;
  background: rgba(112,214,255,0.08);
  border: 1px solid rgba(112,214,255,0.18);
  color: var(--accent);
  font-size: 12px;
  margin-bottom: 10px;
}
.explain-body {
  margin: 0;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.65;
}
.controls-row { margin-bottom: 12px; }
.inline-value {
  margin-top: 6px;
  font-size: 12px;
  color: var(--muted);
}
.status-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}
.metric {
  padding: 12px;
  border-radius: 16px;
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.06);
}
.metric .label {
  color: var(--muted);
  font-size: 12px;
  margin-bottom: 6px;
}
.metric .value {
  font-size: 18px;
  font-weight: 700;
  line-height: 1.2;
}
.mini {
  color: var(--muted);
  font-size: 12px;
  line-height: 1.6;
}
.mono {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  white-space: pre-wrap;
  word-break: break-word;
}
.qubit-summary-grid {
  display: grid;
  gap: 10px;
}
.qubit-chip {
  padding: 12px;
  border-radius: 16px;
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.06);
  display: grid;
  gap: 6px;
}
.qubit-chip.is-selected {
  border-color: rgba(112,214,255,0.3);
  box-shadow: var(--soft-glow);
}
.qubit-chip-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}
.qubit-chip strong {
  font-size: 14px;
}
.chip-tag {
  padding: 4px 8px;
  border-radius: 999px;
  background: rgba(255,255,255,0.05);
  font-size: 11px;
  color: var(--muted);
}
.basis-meta {
  color: var(--muted);
  font-size: 12px;
  margin-bottom: 10px;
}
.basis-chart {
  display: grid;
  gap: 8px;
}
.basis-row {
  display: grid;
  grid-template-columns: 58px 1fr 58px;
  align-items: center;
  gap: 8px;
  font-size: 12px;
}
.basis-row code {
  color: var(--text);
}
.basis-bar {
  position: relative;
  height: 14px;
  border-radius: 999px;
  background: rgba(255,255,255,0.08);
  overflow: hidden;
}
.basis-bar > span {
  position: absolute;
  inset: 0 auto 0 0;
  border-radius: 999px;
  background: linear-gradient(90deg, rgba(112,214,255,0.75), rgba(167,139,250,0.82));
}
.formula-panel {
  display: grid;
  gap: 12px;
}
.formula-banner {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: center;
  padding: 10px 12px;
  border-radius: 16px;
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.06);
  font-size: 13px;
}
.formula-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}
.formula-cell {
  padding: 12px;
  border-radius: 16px;
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.06);
}
.formula-cell-wide {
  grid-column: 1 / -1;
}
.formula-cell pre {
  margin: 8px 0 0;
  font-size: 12px;
  color: var(--text);
}
.test-summary {
  font-size: 12px;
  color: var(--muted);
}
.test-pass { color: var(--good); }
.test-fail { color: var(--danger); }
.test-list {
  display: grid;
  gap: 6px;
  max-height: 180px;
  overflow: auto;
  font-size: 12px;
  color: var(--muted);
  margin-top: 8px;
}
.main-stage {
  display: grid;
  grid-template-rows: auto minmax(0, 1fr);
  gap: 16px;
  min-width: 0;
}
.timeline-shell {
  padding: 14px;
  display: grid;
  gap: 12px;
}
.timeline-head {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: flex-start;
}
.timeline-head h2 {
  margin: 0 0 8px;
}
.timeline-head p {
  margin: 0;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.6;
}
.timeline-legend {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  align-items: center;
  color: var(--muted);
  font-size: 12px;
}
.dot {
  display: inline-block;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  margin-right: 6px;
}
.dot-current { background: var(--accent); }
.dot-done { background: #9d7dff; }
.dot-pending { background: rgba(255,255,255,0.2); }
.circuit-scroll {
  overflow-x: auto;
  padding-bottom: 6px;
}
.circuit-board {
  display: flex;
  gap: 12px;
  align-items: stretch;
  min-height: 180px;
}
.lane-label-column,
.start-column,
.step-column,
.insert-column {
  flex: 0 0 auto;
}
.lane-label-column {
  width: 82px;
  display: grid;
  grid-template-rows: 50px repeat(var(--lane-count, 1), 58px);
  gap: 8px;
}
.lane-label-spacer,
.lane-label {
  display: grid;
  place-items: center;
  border-radius: 16px;
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.06);
  color: var(--muted);
}
.lane-label strong { color: var(--text); }
.start-column {
  width: 96px;
  display: grid;
  grid-template-rows: 50px repeat(var(--lane-count, 1), 58px);
  gap: 8px;
}
.start-head,
.start-cell,
.insert-head,
.insert-cell {
  border-radius: 16px;
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.06);
}
.start-head,
.insert-head {
  display: grid;
  place-items: center;
  color: var(--muted);
  font-size: 12px;
}
.start-cell {
  display: grid;
  place-items: center;
  color: var(--text);
  font-weight: 700;
  position: relative;
}
.start-cell::before,
.lane-cell::before,
.insert-cell::before {
  content: "";
  position: absolute;
  left: 10px;
  right: 10px;
  top: 50%;
  height: 1px;
  background: rgba(255,255,255,0.16);
  transform: translateY(-50%);
}
.insert-column {
  width: 36px;
  display: grid;
  grid-template-rows: 50px repeat(var(--lane-count, 1), 58px);
  gap: 8px;
}
.insert-cell {
  display: grid;
  place-items: center;
}
.insert-slot {
  position: relative;
  z-index: 1;
  width: 24px;
  height: 24px;
  padding: 0;
  border-radius: 999px;
  display: grid;
  place-items: center;
}
.insert-slot.drag-over {
  box-shadow: var(--soft-glow);
}
.step-column {
  position: relative;
  width: 122px;
  display: grid;
  grid-template-rows: 50px repeat(var(--lane-count, 1), 58px);
  gap: 8px;
}
.step-column.drag-over .step-head {
  border-color: rgba(112,214,255,0.36);
  box-shadow: var(--soft-glow);
}
.step-head,
.lane-cell {
  position: relative;
  border-radius: 18px;
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.06);
}
.step-head {
  padding: 8px 34px 8px 12px;
  text-align: left;
}
.step-head strong,
.step-head small {
  display: block;
}
.step-head small {
  color: var(--muted);
  margin-top: 4px;
}
.step-head.done {
  border-color: rgba(167,139,250,0.22);
  background: rgba(167,139,250,0.08);
}
.step-head.current {
  border-color: rgba(112,214,255,0.32);
  background: rgba(112,214,255,0.1);
  box-shadow: var(--soft-glow);
}
.step-head.pending {
  opacity: 0.82;
}
.step-head[draggable="true"] {
  cursor: grab;
}
.step-head.dragging {
  opacity: 0.5;
}
.step-delete {
  position: absolute;
  top: 8px;
  right: 8px;
  width: 22px;
  height: 22px;
  padding: 0;
  border-radius: 999px;
  display: grid;
  place-items: center;
  font-size: 12px;
}
.step-delete:hover {
  background: rgba(251,113,133,0.14);
  border-color: rgba(251,113,133,0.26);
}
.lane-cell {
  display: grid;
  place-items: center;
}
.gate-box {
  position: relative;
  z-index: 2;
  min-width: 54px;
  padding: 8px 10px;
  border-radius: 14px;
  background: linear-gradient(135deg, rgba(112,214,255,0.18), rgba(167,139,250,0.16));
  border: 1px solid rgba(112,214,255,0.26);
  text-align: center;
  font-weight: 700;
}
.gate-box small {
  display: block;
  margin-top: 2px;
  color: var(--muted);
  font-size: 10px;
}
.control-dot,
.swap-mark,
.target-plus {
  position: relative;
  z-index: 2;
}
.control-dot {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 4px rgba(112,214,255,0.12);
}
.target-plus {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  border: 2px solid rgba(112,214,255,0.9);
}
.target-plus::before,
.target-plus::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  background: rgba(112,214,255,0.95);
  transform: translate(-50%, -50%);
}
.target-plus::before { width: 2px; height: 18px; }
.target-plus::after { width: 18px; height: 2px; }
.swap-mark {
  width: 22px;
  height: 22px;
}
.swap-mark::before,
.swap-mark::after {
  content: "";
  position: absolute;
  inset: 0;
  margin: auto;
  width: 2px;
  height: 22px;
  background: rgba(207,184,255,0.95);
  transform-origin: center;
}
.swap-mark::before { transform: rotate(45deg); }
.swap-mark::after { transform: rotate(-45deg); }
.step-connector {
  position: absolute;
  width: 2px;
  background: linear-gradient(180deg, rgba(112,214,255,0.35), rgba(207,184,255,0.92));
  left: 60px;
  z-index: 1;
  border-radius: 999px;
}
.viewer {
  display: grid;
  grid-template-rows: auto minmax(0, 1fr);
  overflow: hidden;
}
.viewer-toolbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  padding: 12px 14px 0;
}
.viewer-mode-switch {
  display: inline-flex;
  gap: 8px;
  flex-wrap: wrap;
}
.mode-button.is-active {
  background: linear-gradient(135deg, rgba(112,214,255,0.22), rgba(167,139,250,0.22));
  border-color: rgba(112,214,255,0.24);
}
.viewer-status {
  color: var(--muted);
  font-size: 12px;
  max-width: 420px;
  text-align: right;
}
.viewer-stage {
  position: relative;
  overflow: hidden;
}
#scene,
.online-frame {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: 0;
  display: block;
}
.is-hidden { display: none !important; }
.hud {
  position: absolute;
  top: 16px;
  left: 16px;
  right: 16px;
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 12px;
  pointer-events: none;
}
.hud-card {
  pointer-events: auto;
  max-width: min(430px, 48vw);
  padding: 14px 16px;
  background: rgba(8, 16, 30, 0.72);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 18px;
  backdrop-filter: blur(12px);
}
.hud-card h3 {
  margin: 0 0 8px;
  font-size: 14px;
  color: var(--accent);
}
.hud-card p {
  margin: 0;
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
}
.hud-card-small { max-width: 320px; }
.badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 10px;
  border-radius: 999px;
  background: rgba(255,255,255,0.07);
  border: 1px solid rgba(255,255,255,0.08);
  font-size: 12px;
  color: var(--text);
  margin-bottom: 8px;
}
.progress {
  width: 220px;
  height: 8px;
  border-radius: 999px;
  background: rgba(255,255,255,0.08);
  overflow: hidden;
  margin-top: 8px;
}
.progress > span {
  display: block;
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  transition: width .18s ease;
}
.footer-tip {
  position: absolute;
  left: 16px;
  bottom: 16px;
  padding: 10px 12px;
  border-radius: 14px;
  background: rgba(8, 16, 30, 0.65);
  border: 1px solid rgba(255,255,255,0.07);
  color: var(--muted);
  font-size: 12px;
  backdrop-filter: blur(8px);
}
.insert-popover {
  position: fixed;
  z-index: 20;
  width: min(340px, calc(100vw - 24px));
  background: rgba(10, 21, 38, 0.96);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 18px;
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
  padding: 12px;
  opacity: 0;
  pointer-events: none;
  transform: translateY(6px);
  transition: opacity .15s ease, transform .15s ease;
}
.insert-popover.is-visible {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}
.insert-popover-title {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 10px;
  font-size: 13px;
}
.insert-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
}
.insert-mini-btn {
  text-align: left;
  padding: 10px;
  border-radius: 14px;
}
.insert-mini-btn strong,
.insert-mini-btn small {
  display: block;
}
.insert-mini-btn small {
  color: var(--muted);
  margin-top: 4px;
}
@media (max-width: 1260px) {
  body { overflow: auto; }
  .app-shell {
    grid-template-columns: 1fr;
    grid-template-rows: auto minmax(720px, 78vh);
    height: auto;
  }
  .sidebar { max-height: none; }
}
@media (max-width: 860px) {
  .control-grid.two-col,
  .control-grid.three-col,
  .formula-grid,
  .status-grid {
    grid-template-columns: 1fr;
  }
  .viewer-toolbar,
  .timeline-head,
  .hud {
    flex-direction: column;
    align-items: stretch;
  }
  .hud-card,
  .hud-card-small,
  .viewer-status { max-width: none; }
  .gates,
  .gates-two {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}


.measurement-panel {
  display: grid;
  gap: 10px;
  padding: 12px;
  border-radius: 18px;
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.06);
}
.measurement-pill {
  display: inline-flex;
  align-items: center;
  justify-self: start;
  padding: 6px 10px;
  border-radius: 999px;
  background: rgba(112,214,255,0.08);
  border: 1px solid rgba(112,214,255,0.18);
  color: var(--accent);
  font-size: 12px;
}
.measurement-pill.is-collapsed {
  background: rgba(74,222,128,0.1);
  border-color: rgba(74,222,128,0.25);
  color: var(--good);
}
.measurement-pill.is-pending {
  background: rgba(251,191,36,0.1);
  border-color: rgba(251,191,36,0.22);
  color: var(--warn);
}
.gate-box.gate-measure {
  background: linear-gradient(135deg, rgba(74,222,128,0.16), rgba(112,214,255,0.16));
  border-color: rgba(74,222,128,0.26);
}
.gate-box.gate-measure strong {
  display: block;
  font-size: 15px;
  line-height: 1;
}
.gate-box.gate-measure small {
  display: block;
  margin-top: 3px;
}