:root {
  color-scheme: dark;
  --page: #111722;
  --panel: #1c2330;
  --panel-box: #273040;
  --text: #f0f3f8;
  --muted: #a0aaba;
  --blue: #4a90e2;
  --green: #3fb950;
  --yellow: #ffdc41;
  --border: rgba(255, 255, 255, 0.12);
}

* {
  box-sizing: border-box;
}

html {
  min-width: 320px;
  background: var(--page);
}

body {
  min-height: 100vh;
  margin: 0;
  color: var(--text);
  background:
    radial-gradient(circle at 12% 0%, rgba(74, 144, 226, 0.15), transparent 28rem),
    var(--page);
  font-family: Consolas, "Courier New", monospace;
}

button,
input {
  font: inherit;
}

button,
a {
  -webkit-tap-highlight-color: transparent;
}

.page-header {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
  padding: 28px 0 22px;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 24px;
}

.page-header > div {
  text-align: center;
}

.page-header h1 {
  margin: 3px 0 0;
  font-size: clamp(1.2rem, 3vw, 2rem);
}

.eyebrow {
  margin: 0;
  color: var(--blue);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.13em;
  text-transform: uppercase;
}

.back-link,
.source-link {
  width: max-content;
  color: var(--text);
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 255, 255, 0.35);
}

.source-link {
  justify-self: end;
}

.lab-shell {
  width: min(940px, calc(100% - 24px));
  margin: 0 auto;
  padding: 18px;
  border: 1px solid var(--border);
  border-radius: 18px;
  background: rgba(28, 35, 48, 0.72);
  box-shadow: 0 28px 80px rgba(0, 0, 0, 0.36);
}

.stage {
  position: relative;
  width: 100%;
  aspect-ratio: 820 / 800;
  overflow: hidden;
  border-radius: 9px;
  background: var(--panel);
}

#game-canvas {
  display: block;
  width: 100%;
  height: 100%;
}

.settings-screen {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  color: var(--text);
  background: var(--panel);
}

.settings-screen[hidden] {
  display: none;
}

.settings-heading {
  margin-top: 11.5%;
  text-align: center;
}

.settings-heading h2 {
  margin: 0;
  font-size: clamp(1.35rem, 4vw, 2.25rem);
}

.settings-heading p {
  margin: 14px 0 0;
  color: var(--muted);
  font-size: clamp(0.62rem, 1.7vw, 1rem);
}

.settings-card {
  width: 57.3%;
  margin-top: 7%;
  padding: 4.5% 4.2%;
  display: grid;
  gap: 15px;
  border-radius: 10px;
  background: #171d28;
}

.settings-card label {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 38%;
  align-items: center;
  gap: 20px;
  color: var(--text);
  font-size: clamp(0.58rem, 1.55vw, 1rem);
}

.settings-card input {
  width: 100%;
  min-width: 0;
  padding: 9px 10px;
  color: var(--text);
  border: 2px solid var(--muted);
  border-radius: 5px;
  outline: 0;
  background: var(--panel-box);
  appearance: textfield;
}

.settings-card input:focus {
  border-color: var(--blue);
}

.settings-card input::-webkit-inner-spin-button {
  opacity: 0.55;
}

.start-button {
  width: 24.4%;
  min-width: 164px;
  margin-top: 3%;
  padding: 15px 18px;
  color: var(--text);
  font-size: clamp(0.72rem, 2vw, 1.35rem);
  font-weight: 700;
  border: 0;
  border-radius: 7px;
  background: var(--blue);
  cursor: pointer;
}

.start-button:hover,
.start-button:focus-visible {
  filter: brightness(1.1);
}

.settings-hint {
  margin: 3.5% 0 0;
  color: var(--muted);
  font-size: clamp(0.56rem, 1.5vw, 0.95rem);
}

.touch-controls {
  position: absolute;
  right: 18px;
  bottom: 14px;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 7px;
}

.touch-controls[hidden] {
  display: none;
}

.control-buttons {
  display: flex;
  gap: 8px;
}

.speed-control {
  width: 210px;
  padding: 7px 9px;
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: center;
  gap: 10px;
  color: var(--text);
  font-size: 0.72rem;
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 6px;
  background: rgba(39, 48, 64, 0.92);
}

.speed-control span {
  white-space: nowrap;
}

.speed-control output {
  color: var(--yellow);
}

.speed-control input {
  width: 100%;
  accent-color: var(--blue);
  cursor: pointer;
}

.control-buttons button,
#download-log {
  padding: 8px 11px;
  color: var(--text);
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 6px;
  background: rgba(39, 48, 64, 0.9);
  cursor: pointer;
}

.project-notes {
  width: min(940px, calc(100% - 32px));
  margin: 28px auto 60px;
  padding: 24px 0;
  display: grid;
  grid-template-columns: 1fr 1.3fr auto;
  align-items: center;
  gap: 30px;
  border-top: 1px solid var(--border);
}

.project-notes h2 {
  margin: 7px 0 0;
  font-family: system-ui, sans-serif;
  font-size: clamp(1.2rem, 2.4vw, 1.85rem);
}

.project-notes > p {
  margin: 0;
  color: var(--muted);
  font-family: system-ui, sans-serif;
  line-height: 1.65;
}

#download-log {
  white-space: nowrap;
}

#network-dialog {
  width: min(960px, calc(100% - 28px));
  padding: 24px;
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 14px;
  background: var(--panel);
  box-shadow: 0 28px 90px rgba(0, 0, 0, 0.6);
}

#network-dialog::backdrop {
  background: rgba(5, 8, 13, 0.78);
  backdrop-filter: blur(5px);
}

.dialog-heading {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 20px;
}

.dialog-heading h2 {
  margin: 5px 0 14px;
}

#close-network {
  width: 40px;
  height: 40px;
  color: var(--text);
  font-size: 1.8rem;
  line-height: 1;
  border: 0;
  border-radius: 50%;
  background: var(--panel-box);
  cursor: pointer;
}

#network-canvas {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 8px;
  background: #171d28;
}

#network-summary {
  margin: 14px 0 0;
  color: var(--muted);
}

@media (max-width: 760px) {
  .page-header {
    grid-template-columns: 1fr 1fr;
  }

  .page-header > div {
    grid-column: 1 / -1;
    grid-row: 1;
  }

  .back-link {
    grid-column: 1;
    grid-row: 2;
  }

  .source-link {
    grid-column: 2;
    grid-row: 2;
  }

  .lab-shell {
    padding: 8px;
  }

  .stage {
    width: 100%;
  }

  .settings-heading {
    margin-top: 8%;
  }

  .settings-card {
    width: 74%;
    margin-top: 5%;
    padding: 4%;
    gap: 8px;
  }

  .settings-card label {
    gap: 10px;
  }

  .settings-card input {
    padding: 5px 7px;
  }

  .start-button {
    margin-top: 2.5%;
    padding: 9px 14px;
  }

  .settings-hint {
    margin-top: 2.5%;
  }

  .touch-controls {
    right: 7px;
    bottom: 7px;
    gap: 4px;
  }

  .control-buttons {
    gap: 4px;
  }

  .control-buttons button {
    padding: 5px 7px;
    font-size: 0.58rem;
  }

  .speed-control {
    width: 164px;
    padding: 4px 6px;
    gap: 6px;
    font-size: 0.55rem;
  }

  .project-notes {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  #download-log {
    width: max-content;
  }
}

@media (max-width: 430px) {
  .settings-card {
    width: 82%;
  }

  .settings-heading p {
    margin-top: 7px;
  }

  .settings-hint {
    display: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  * {
    scroll-behavior: auto !important;
  }
}