:root {
  --navy: #08142f;
  --navy-2: #0d2455;
  --navy-3: #113778;
  --gold: #d4af37;
  --gold-soft: #f0cf68;
  --teal: #2dd4bf;
  --sky: #38bdf8;
  --orange: #f59e0b;
  --rose: #fb7185;
  --green: #34d399;
  --violet: #a78bfa;
  --ink: #111827;
  --muted: #68758f;
  --paper: #eef3fb;
  --card: #ffffff;
  --line: #dfe7f3;
  --shadow: 0 18px 48px rgba(8, 20, 47, 0.15);
  --soft-shadow: 0 10px 28px rgba(8, 20, 47, 0.09);
  --focus-ring: 0 0 0 4px rgba(56, 189, 248, 0.18);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
}

body {
  font-family: Inter, "Segoe UI", system-ui, -apple-system, sans-serif;
  color: var(--ink);
  background: linear-gradient(180deg, #f5f7fb 0%, #e8eef6 58%, #dfe7f2 100%);
  -webkit-font-smoothing: antialiased;
}

button,
select,
input {
  font: inherit;
}

button,
a,
input,
select {
  transition: border-color 0.18s ease, background 0.18s ease, color 0.18s ease, box-shadow 0.18s ease, transform 0.18s ease;
}

button:focus-visible,
a:focus-visible,
input:focus-visible,
select:focus-visible {
  outline: 0;
  box-shadow: var(--focus-ring);
}

.lab-shell {
  min-height: 100vh;
}

.topbar {
  min-height: 96px;
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 18px max(20px, calc((100vw - 1120px) / 2));
  color: #fff;
  background:
    linear-gradient(135deg, #071536 0%, #0c2458 64%, #12336f 100%);
  border-bottom: 3px solid var(--gold);
  box-shadow: var(--shadow);
}

.brand-mark {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--navy);
  background: radial-gradient(circle at 28% 22%, #ffe89a, var(--gold) 70%);
  font-weight: 850;
  text-decoration: none;
  letter-spacing: 0;
  box-shadow: 0 0 0 4px rgba(212, 175, 55, 0.22);
  flex: 0 0 auto;
}

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

.brand-copy h1 {
  margin: 0;
  font-size: 21px;
  line-height: 1.15;
  letter-spacing: 0;
}

.brand-copy p {
  margin: 3px 0 0;
  color: #b8c8eb;
  font-size: 13px;
  line-height: 1.3;
}

.topbar-actions {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 8px;
}

.icon-btn {
  height: 38px;
  min-width: 38px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 13px;
  border-radius: 8px;
  border: 1px solid rgba(255, 255, 255, 0.16);
  color: #d7e3ff;
  background: rgba(255, 255, 255, 0.08);
  cursor: pointer;
  font-size: 12px;
  font-weight: 750;
  text-decoration: none;
}

.icon-btn:hover {
  background: rgba(255, 255, 255, 0.14);
}

.icon-btn.primary {
  color: var(--navy);
  background: var(--gold);
  border-color: var(--gold);
}

.lab-hero,
.lab-browser {
  width: min(1200px, calc(100% - 36px));
  margin: 18px auto 0;
}

.lab-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(330px, 440px);
  gap: 18px;
  align-items: stretch;
}

.lab-hero-copy,
.lab-search-card,
.lab-browser {
  border: 1px solid var(--line);
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.88);
  box-shadow: var(--soft-shadow);
}

.lab-hero-copy {
  padding: 24px;
  background:
    linear-gradient(135deg, rgba(8, 20, 47, 0.96), rgba(13, 36, 85, 0.92)),
    radial-gradient(circle at top right, rgba(45, 212, 191, 0.22), transparent 36%);
  color: #fff;
  overflow: hidden;
}

.eyebrow {
  margin: 0 0 8px;
  color: var(--gold-soft);
  font-size: 11px;
  font-weight: 860;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.lab-hero h2,
.browser-head h2 {
  margin: 0;
  color: inherit;
  font-size: clamp(24px, 3.2vw, 42px);
  line-height: 1.05;
  letter-spacing: 0;
}

.lab-hero p:last-child {
  max-width: 720px;
  margin: 12px 0 0;
  color: #d9e5ff;
  font-size: 15px;
  line-height: 1.65;
}

.lab-search-card {
  display: grid;
  align-content: center;
  gap: 12px;
  padding: 18px;
}

.lab-search-card label {
  color: var(--navy);
  font-size: 12px;
  font-weight: 850;
  text-transform: uppercase;
}

.lab-search-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 8px;
}

.lab-search-row input {
  min-height: 44px;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 0 13px;
  color: var(--navy);
  background: #fff;
}

.lab-search-row input:focus {
  border-color: var(--sky);
}

.lab-search-row button,
.mini-btn {
  min-height: 38px;
  border: 1px solid rgba(8, 20, 47, 0.12);
  border-radius: 9px;
  padding: 0 12px;
  color: var(--navy);
  background: #f7f9fe;
  cursor: pointer;
  font-size: 12px;
  font-weight: 850;
}

.lab-search-row button:hover,
.mini-btn:hover,
.experiment-card:hover,
.quick-lab:hover {
  transform: translateY(-1px);
  box-shadow: 0 10px 24px rgba(8, 20, 47, 0.12);
}

.lab-stat-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 8px;
}

.lab-stat {
  min-height: 68px;
  border: 1px solid var(--line);
  border-radius: 13px;
  padding: 10px;
  background: #f8fbff;
}

.lab-stat strong {
  display: block;
  color: var(--navy);
  font-size: 22px;
  line-height: 1;
}

.lab-stat span {
  display: block;
  margin-top: 5px;
  color: var(--muted);
  font-size: 11px;
  font-weight: 750;
}

.lab-browser {
  padding: 18px;
}

.browser-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 14px;
}

.browser-head h2 {
  color: var(--navy);
  font-size: clamp(20px, 2.4vw, 30px);
}

.match-count {
  padding: 7px 10px;
  border: 1px solid rgba(45, 212, 191, 0.28);
  border-radius: 999px;
  color: #0c6f66;
  background: rgba(45, 212, 191, 0.1);
  font-size: 12px;
  font-weight: 850;
  white-space: nowrap;
}

.topic-rail {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 2px;
  overflow-x: auto;
  border-bottom: 0;
  background: transparent;
}

.topic-tab {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  color: var(--muted);
  cursor: pointer;
  padding: 8px 10px;
  white-space: nowrap;
  font-size: 12px;
  font-weight: 760;
  box-shadow: 0 5px 16px rgba(8, 20, 47, 0.06);
}

.topic-tab.is-active {
  color: #fff;
  background: var(--navy);
  border-color: var(--navy);
}

.quick-lab-grid,
.experiment-grid {
  display: grid;
  gap: 12px;
  margin-top: 14px;
}

.quick-lab-grid {
  grid-template-columns: repeat(5, minmax(0, 1fr));
}

.experiment-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.quick-lab,
.experiment-card {
  border: 1px solid var(--line);
  border-radius: 14px;
  background: #fff;
  cursor: pointer;
  text-align: left;
  box-shadow: 0 6px 18px rgba(8, 20, 47, 0.05);
}

.quick-lab {
  min-height: 112px;
  padding: 12px;
  display: grid;
  align-content: start;
  gap: 9px;
}

.experiment-card {
  min-height: 178px;
  padding: 14px;
  display: grid;
  align-content: start;
  gap: 9px;
}

.quick-lab.is-active,
.experiment-card.is-active {
  border-color: rgba(212, 175, 55, 0.78);
  box-shadow: 0 0 0 3px rgba(212, 175, 55, 0.16), var(--soft-shadow);
}

.quick-lab strong,
.experiment-card strong {
  display: block;
  color: var(--navy);
  font-size: 14px;
  line-height: 1.25;
}

.quick-lab span,
.experiment-card p {
  margin: 4px 0 0;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.45;
}

.quick-lab p {
  margin: 0;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.45;
}

.card-title-row {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 10px;
}

.card-title-row strong {
  min-width: 0;
}

.case-card-actions {
  display: inline-flex;
  align-items: center;
  flex: 0 0 auto;
  gap: 6px;
}

.case-action-btn {
  min-height: 28px;
  border: 1px solid rgba(8, 20, 47, 0.12);
  border-radius: 7px;
  padding: 0 9px;
  cursor: pointer;
  font-size: 11px;
  font-weight: 880;
  line-height: 1;
}

.case-action-btn.play {
  color: #fff;
  background: var(--navy);
}

.case-action-btn.reset {
  color: var(--navy);
  background: #f7f9fe;
}

.case-action-btn:hover,
.case-action-btn:focus-visible,
.quick-lab.is-active .case-action-btn.play,
.experiment-card.is-active .case-action-btn.play {
  color: var(--navy);
  background: var(--gold);
  border-color: rgba(212, 175, 55, 0.7);
}

.experiment-meta,
.symbol-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.experiment-symbol,
.symbol-chip {
  display: inline-flex;
  align-items: center;
  min-height: 24px;
  padding: 2px 7px;
  border: 1px solid rgba(56, 189, 248, 0.2);
  border-radius: 999px;
  color: #0d4d80;
  background: rgba(56, 189, 248, 0.09);
  font-size: 11px;
  font-weight: 820;
}

.experiment-topic {
  color: #785b08;
  background: rgba(240, 207, 104, 0.2);
  border-color: rgba(212, 175, 55, 0.28);
}

.no-results {
  grid-column: 1 / -1;
  min-height: 130px;
  display: grid;
  place-items: center;
  padding: 22px;
  color: var(--muted);
  border: 1px dashed var(--line);
  border-radius: 14px;
  background: #fbfcff;
  text-align: center;
}

.lab-main {
  width: min(1200px, 100%);
  margin: 0 auto;
  padding: 18px;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  align-items: start;
  gap: 18px;
}

.stage-panel,
.panel-block {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 22px;
  box-shadow: var(--shadow);
  overflow: hidden;
}

.stage-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 18px 22px;
  border-bottom: 1px solid var(--line);
}

.stage-title-line {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
}

.stage-title-actions {
  display: inline-flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 7px;
}

.stage-title-actions .mini-btn {
  min-height: 32px;
}

.stage-title-actions .title-play {
  color: var(--navy);
  background: var(--gold);
  border-color: rgba(212, 175, 55, 0.7);
}

.stage-head h2 {
  margin: 0;
  color: var(--navy);
  font-size: 18px;
  line-height: 1.15;
  letter-spacing: 0;
  text-transform: uppercase;
}

.stage-head p {
  margin: 4px 0 0;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.4;
}

.case-chip {
  flex: 0 0 auto;
  max-width: 320px;
  padding: 8px 12px;
  color: #7b5e06;
  background: #fff8dc;
  border: 1px solid rgba(212, 175, 55, 0.45);
  border-radius: 999px;
  font-size: 12px;
  font-weight: 800;
  text-align: right;
}

.canvas-wrap {
  position: relative;
  background: #071127;
}

#labCanvas {
  display: block;
  width: 100%;
  height: 560px;
}

.hud {
  position: absolute;
  top: 14px;
  left: 14px;
  display: grid;
  gap: 7px;
  max-width: min(520px, calc(100% - 28px));
  pointer-events: none;
}

.hud-line {
  width: fit-content;
  max-width: 100%;
  padding: 7px 9px;
  border-radius: 8px;
  color: #dce8ff;
  background: rgba(7, 17, 39, 0.76);
  border: 1px solid rgba(255, 255, 255, 0.11);
  font-size: 12px;
  font-weight: 680;
  line-height: 1.3;
  backdrop-filter: blur(5px);
}

.timeline {
  min-height: 58px;
  display: grid;
  grid-template-columns: auto minmax(140px, 1fr) 76px 78px;
  align-items: center;
  gap: 12px;
  padding: 11px 16px;
  border-top: 1px solid var(--line);
  background: #fbfcff;
}

.timeline label,
.timeline output {
  color: var(--muted);
  font-size: 12px;
  font-weight: 760;
}

.timeline output {
  color: var(--navy);
  text-align: right;
  font-variant-numeric: tabular-nums;
}

input[type="range"] {
  width: 100%;
  accent-color: var(--gold);
}

select {
  width: 100%;
  min-height: 38px;
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--ink);
  background: #fff;
  padding: 8px 10px;
  font-size: 13px;
}

.inspector {
  display: grid;
  grid-template-columns: 1.15fr 1fr;
  gap: 18px;
  background: transparent;
  border: 0;
  box-shadow: none;
  overflow: visible;
}

.panel-block {
  padding: 18px;
}

.panel-title {
  margin: -18px -18px 14px;
  padding: 15px 18px;
  color: var(--navy);
  border-bottom: 1px solid var(--line);
  background: #fff;
  font-size: 13px;
  font-weight: 850;
  letter-spacing: 0;
  text-transform: uppercase;
  display: flex;
  align-items: center;
  gap: 8px;
}

.panel-title::before,
.stage-head h2::before {
  content: "";
  width: 9px;
  height: 9px;
  display: inline-block;
  border-radius: 50%;
  background: var(--gold);
  box-shadow: 0 0 0 4px rgba(212, 175, 55, 0.14);
  margin-right: 8px;
}

.case-purpose {
  margin: 10px 0 0;
  color: var(--muted);
  font-size: 12.5px;
  line-height: 1.5;
}

.case-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 10px;
}

.tag {
  padding: 4px 7px;
  color: #614807;
  background: #fff8dc;
  border: 1px solid rgba(212, 175, 55, 0.34);
  border-radius: 7px;
  font-size: 10.5px;
  font-weight: 790;
}

.case-sequence {
  display: grid;
  gap: 8px;
}

.case-step {
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 10px;
  background: #f8fbff;
}

.case-step.is-active {
  border-color: rgba(212, 175, 55, 0.55);
  background: #fff8dc;
}

.case-step .step-k {
  color: var(--muted);
  font-size: 10px;
  font-weight: 850;
  text-transform: uppercase;
}

.case-step .step-v {
  margin-top: 3px;
  color: var(--navy);
  font-size: 12.5px;
  font-weight: 820;
  line-height: 1.35;
}

.case-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  margin-top: 10px;
}

.symbol-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
}

.symbol-card {
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 9px;
  background: #f7f9fe;
}

.symbol-card strong {
  color: var(--navy);
  font-size: 17px;
  line-height: 1;
}

.symbol-card span {
  display: block;
  margin-top: 4px;
  color: var(--muted);
  font-size: 11px;
  line-height: 1.35;
}

.control-stack {
  display: grid;
  gap: 12px;
}

.control-row {
  display: grid;
  grid-template-columns: 92px minmax(0, 1fr) 64px;
  gap: 10px;
  align-items: center;
}

.control-row label {
  color: var(--muted);
  font-size: 12px;
  font-weight: 760;
}

.control-row input[type="number"] {
  width: 64px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 6px 7px;
  color: var(--navy);
  font-size: 12px;
  font-weight: 760;
  text-align: right;
  font-variant-numeric: tabular-nums;
}

.toggle-row {
  display: grid;
  grid-template-columns: 92px minmax(0, 1fr);
  gap: 10px;
  align-items: center;
}

.toggle-label {
  color: var(--muted);
  font-size: 12px;
  font-weight: 760;
}

.segmented {
  display: flex;
  gap: 4px;
  padding: 4px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #eef3fb;
}

.toggle-button {
  flex: 1;
  min-height: 32px;
  border: 0;
  border-radius: 6px;
  color: var(--muted);
  background: transparent;
  cursor: pointer;
  font-size: 12px;
  font-weight: 800;
}

.toggle-button.is-active {
  color: var(--navy);
  background: #fff;
  box-shadow: 0 3px 10px rgba(8, 20, 47, 0.1);
}

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

.readout {
  min-height: 58px;
  padding: 9px 10px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #f7f9fe;
}

.readout .k {
  color: var(--muted);
  font-size: 10px;
  font-weight: 800;
  letter-spacing: 0;
  text-transform: uppercase;
}

.readout .v {
  margin-top: 3px;
  color: var(--navy);
  font-size: 15px;
  font-weight: 840;
  font-variant-numeric: tabular-nums;
}

.data-table-wrap {
  overflow-x: auto;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 12px;
}

.data-table th,
.data-table td {
  padding: 7px 8px;
  border-bottom: 1px solid var(--line);
  text-align: left;
}

.data-table th {
  color: var(--muted);
  font-size: 10.5px;
  font-weight: 850;
  text-transform: uppercase;
}

.data-table td {
  color: var(--navy);
  font-weight: 760;
}

.mini-btn.wide {
  width: 100%;
  margin-top: 10px;
}

.formula-trail {
  display: grid;
  gap: 8px;
}

.formula {
  padding: 9px 10px;
  color: #25314c;
  background: #f8fbff;
  border-left: 3px solid var(--gold);
  border-radius: 0 10px 10px 0;
  font-size: 12.5px;
  line-height: 1.55;
}

.formula b {
  color: var(--navy);
}

.exam-moves {
  margin: 0;
  padding-left: 19px;
  color: #33415c;
  font-size: 12.5px;
  line-height: 1.55;
}

.exam-moves li + li {
  margin-top: 5px;
}

.compact {
  padding-bottom: 16px;
}

@media (max-width: 1060px) {
  .lab-hero {
    grid-template-columns: 1fr;
  }

  .quick-lab-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .experiment-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .lab-main {
    grid-template-columns: 1fr;
  }

  #labCanvas {
    height: 520px;
  }

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

  .panel-block {
    border-right: 0;
  }
}

@media (max-width: 720px) {
  .lab-hero,
  .lab-browser {
    width: min(100% - 24px, 1200px);
  }

  .browser-head {
    align-items: flex-start;
    flex-direction: column;
  }

  .lab-search-row,
  .lab-stat-grid,
  .quick-lab-grid,
  .experiment-grid {
    grid-template-columns: 1fr;
  }

  .topbar {
    flex-wrap: wrap;
    align-items: flex-start;
    padding-inline: 14px;
  }

  .topbar-actions {
    margin-left: 0;
    width: 100%;
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .icon-btn {
    min-width: 0;
    width: 100%;
    padding: 0 8px;
    white-space: nowrap;
  }

  .lab-hero-copy {
    padding: 20px;
  }

  .lab-hero h2 {
    font-size: 24px;
    line-height: 1.12;
    overflow-wrap: anywhere;
  }

  .lab-hero p:last-child {
    font-size: 14px;
  }

  .lab-main {
    padding: 12px;
  }

  .stage-head {
    align-items: flex-start;
    flex-direction: column;
  }

  .stage-title-line,
  .card-title-row {
    align-items: flex-start;
    flex-direction: column;
  }

  .case-card-actions,
  .stage-title-actions {
    width: 100%;
  }

  .case-action-btn,
  .stage-title-actions .mini-btn {
    flex: 1;
  }

  .case-chip {
    max-width: 100%;
    text-align: left;
  }

  #labCanvas {
    height: 440px;
  }

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

  .timeline input {
    grid-column: 1 / -1;
    grid-row: 1;
  }

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

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

  .panel-block {
    border-right: 0;
  }

  .control-row {
    grid-template-columns: 76px minmax(0, 1fr) 58px;
  }
}