:root {
  --navy: #0b1631;
  --navy-deep: #071022;
  --sky: #d8ebff;
  --paper: #f5f8fc;
  --card: rgba(248, 251, 255, 0.9);
  --card-strong: rgba(252, 254, 255, 0.96);
  --border: rgba(11, 22, 49, 0.12);
  --shadow: rgba(18, 34, 66, 0.18);
  --battery: #e06162;
  --resistor: #d9a95f;
  --switch: #4db7aa;
  --lamp: #6474e1;
  --text: #16243b;
  --text-soft: #5b6882;
}

* {
  box-sizing: border-box;
}

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

body {
  color: var(--text);
  font-family: "Iowan Old Style", "Palatino Linotype", Georgia, serif;
  background:
    radial-gradient(circle at top right, rgba(118, 174, 255, 0.24), transparent 28%),
    linear-gradient(180deg, #122757 0%, #204386 34%, var(--paper) 34%, #eef4fb 100%);
}

.lab-shell {
  width: min(1500px, calc(100% - 32px));
  margin: 0 auto;
  padding: 28px 0 40px;
  display: grid;
  grid-template-columns: minmax(310px, 470px) minmax(0, 1fr);
  gap: 24px;
}

.hero-panel {
  color: #f4f8ff;
  padding: 18px 8px 0;
}

.eyebrow,
.card-label,
.score-tile span {
  margin: 0;
  font-family: "Arial Narrow", "Franklin Gothic Medium", Arial, sans-serif;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  font-size: 0.72rem;
}

.hero-panel h1 {
  margin: 18px 0 18px;
  font-family: "Arial Narrow", Impact, Haettenschweiler, sans-serif;
  font-size: clamp(3.3rem, 6vw, 5.6rem);
  line-height: 0.92;
  letter-spacing: 0.01em;
  text-transform: uppercase;
  max-width: 10ch;
}

.hero-copy {
  margin: 0 0 26px;
  max-width: 35rem;
  line-height: 1.7;
  font-size: 1.08rem;
  color: rgba(244, 248, 255, 0.94);
}

.hero-grid {
  display: grid;
  gap: 14px;
}

.panel-card,
.legend-card,
.scoreboard,
.status-card,
.toast-pill {
  backdrop-filter: blur(12px);
  box-shadow: 0 24px 40px var(--shadow);
}

.panel-card,
.legend-card,
.status-card {
  border: 1px solid rgba(255, 255, 255, 0.16);
  background: rgba(248, 251, 255, 0.12);
  border-radius: 24px;
  padding: 18px 18px 16px;
}

.panel-card h2 {
  margin: 10px 0 8px;
  font-size: 1.5rem;
  line-height: 1.15;
}

.panel-card p:last-child,
.status-copy {
  margin: 0;
  color: rgba(244, 248, 255, 0.9);
  line-height: 1.65;
}

.control-list {
  margin: 10px 0 0;
  padding-left: 18px;
  display: grid;
  gap: 8px;
  color: rgba(244, 248, 255, 0.92);
}

kbd {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 24px;
  padding: 2px 8px;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.22);
  background: rgba(255, 255, 255, 0.12);
  font: inherit;
  font-size: 0.82rem;
}

.legend-card {
  margin-top: 14px;
}

.legend-list {
  margin-top: 12px;
  display: grid;
  gap: 10px;
}

.legend-item {
  display: grid;
  grid-template-columns: 16px 1fr auto;
  align-items: center;
  gap: 10px;
  color: rgba(244, 248, 255, 0.92);
}

.legend-item strong,
.scorm-card strong {
  font-family: "Arial Narrow", "Franklin Gothic Medium", Arial, sans-serif;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.swatch {
  width: 16px;
  height: 16px;
  border-radius: 4px;
  display: inline-block;
  border: 1px solid rgba(255, 255, 255, 0.28);
}

.swatch-battery { background: var(--battery); }
.swatch-resistor { background: var(--resistor); }
.swatch-switch { background: var(--switch); }
.swatch-lamp { background: var(--lamp); }

.scorm-card {
  margin-top: 14px;
}

.scorm-card strong {
  display: block;
  margin: 8px 0 10px;
  color: #ffffff;
}

.hero-actions {
  margin-top: 22px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.action-button {
  text-decoration: none;
  border-radius: 999px;
  padding: 12px 18px;
  font-family: "Arial Narrow", "Franklin Gothic Medium", Arial, sans-serif;
  font-weight: 700;
  letter-spacing: 0.11em;
  text-transform: uppercase;
  cursor: pointer;
  transition: transform 160ms ease, background 160ms ease;
}

.action-button:hover {
  transform: translateY(-1px);
}

.action-button.solid {
  border: none;
  color: var(--navy-deep);
  background: #ffffff;
}

.simulation-panel {
  position: relative;
  min-height: 880px;
  border-radius: 34px;
  overflow: hidden;
  border: 1px solid rgba(15, 30, 64, 0.14);
  background:
    linear-gradient(180deg, rgba(247, 251, 255, 0.94) 0%, rgba(240, 246, 252, 0.96) 100%);
  box-shadow: 0 26px 46px rgba(23, 37, 71, 0.22);
}

.simulation-panel::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 15% 12%, rgba(100, 116, 225, 0.12), transparent 25%),
    radial-gradient(circle at 82% 84%, rgba(77, 183, 170, 0.1), transparent 26%);
  pointer-events: none;
  z-index: 0;
}

.simulation-root {
  position: relative;
  z-index: 1;
  min-height: 880px;
}

.simulation-root canvas {
  display: block;
  width: 100%;
  height: 100%;
}

.top-hud,
.bottom-hud {
  position: absolute;
  left: 18px;
  right: 18px;
  z-index: 3;
}

.top-hud {
  top: 18px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 14px;
  align-items: start;
}

.scoreboard {
  display: grid;
  grid-template-columns: repeat(5, minmax(92px, 1fr));
  gap: 10px;
  padding: 12px;
  border-radius: 24px;
  background: var(--card);
  border: 1px solid var(--border);
}

.score-tile {
  padding: 10px 12px;
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.74);
  border: 1px solid rgba(11, 22, 49, 0.08);
}

.score-tile strong {
  display: block;
  margin-top: 6px;
  font-family: "Arial Narrow", "Franklin Gothic Medium", Arial, sans-serif;
  font-size: 1.38rem;
  letter-spacing: 0.02em;
  color: #204386;
}

.status-card {
  background: var(--card-strong);
  border-color: rgba(11, 22, 49, 0.08);
  color: var(--text);
}

.status-card strong {
  display: block;
  margin: 8px 0 10px;
  font-family: "Arial Narrow", "Franklin Gothic Medium", Arial, sans-serif;
  font-size: 1.18rem;
  color: #17356d;
}

.status-card .status-copy {
  color: var(--text-soft);
}

.bottom-hud {
  bottom: 18px;
  display: flex;
  justify-content: center;
}

.toast-pill {
  max-width: min(720px, calc(100% - 12px));
  padding: 12px 18px;
  border-radius: 999px;
  border: 1px solid rgba(11, 22, 49, 0.12);
  background: rgba(255, 255, 255, 0.94);
  text-align: center;
  color: var(--navy-deep);
  font-family: "Arial Narrow", "Franklin Gothic Medium", Arial, sans-serif;
  letter-spacing: 0.03em;
}

.toast-pill.toast-success {
  color: #144d40;
  background: rgba(236, 255, 251, 0.96);
}

.toast-pill.toast-warning {
  color: #6d4100;
  background: rgba(255, 245, 226, 0.96);
}

.toast-pill.toast-danger {
  color: #7d1a25;
  background: rgba(255, 236, 240, 0.96);
}

@media (max-width: 1180px) {
  .lab-shell {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 860px) {
  .simulation-panel,
  .simulation-root {
    min-height: 800px;
  }

  .top-hud {
    grid-template-columns: 1fr;
  }

  .scoreboard {
    grid-template-columns: repeat(2, minmax(120px, 1fr));
  }
}

@media (max-width: 640px) {
  .lab-shell {
    width: min(100% - 16px, 1500px);
    padding-top: 16px;
  }

  .hero-panel h1 {
    max-width: 11ch;
    font-size: clamp(2.7rem, 12vw, 4.2rem);
  }
}