:root {
  --bg: #0b0d12;
  --bg-2: #11141b;
  --bg-3: #161a24;
  --fg: #e6e9ef;
  --muted: #8a93a6;
  --accent: #00ff88;
  --accent-2: #36d1ff;
  --danger: #ff4d6d;
  --warn: #ffcc4d;
  --border: #232838;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  width: 100%;
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, sans-serif;
  overflow: hidden;
}

#app {
  width: 100%;
  height: 100%;
  position: relative;
}

.screen {
  position: absolute;
  inset: 0;
  display: none;
  overflow: auto;
}
.screen.active { display: block; }

/* ---------------- MENU ---------------- */
#menu {
  padding: 36px 48px 80px;
}
.brand h1 {
  font-size: 44px;
  margin: 0;
  letter-spacing: 1px;
}
.brand h1 span {
  color: var(--accent);
}
.brand .tag {
  margin: 4px 0 24px;
  color: var(--muted);
}

.panels {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
  max-width: 1320px;
}
@media (max-width: 900px) {
  .panels { grid-template-columns: 1fr; }
}

.panel {
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 18px 20px;
}
.panel-train {
  grid-column: 1 / -1;
}
.panel h2 {
  margin: 0 0 14px;
  font-size: 16px;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--muted);
}

.mode-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
}
.mode-card {
  background: var(--bg-3);
  border: 1px solid var(--border);
  color: var(--fg);
  padding: 18px 12px;
  border-radius: 10px;
  text-align: left;
  cursor: pointer;
  transition: border-color .15s, transform .15s;
}
.mode-card:hover { border-color: var(--accent); }
.mode-card.selected {
  border-color: var(--accent);
  box-shadow: 0 0 0 2px rgba(0,255,136,0.15);
}
.mode-title { font-weight: 700; font-size: 18px; }
.mode-desc { font-size: 12px; color: var(--muted); margin-top: 4px; }

.form-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  min-width: 0;
}
.panel-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 14px;
  align-items: start;
}
/* Stack only when the viewport is genuinely narrow. */
@media (max-width: 1100px) {
  .panel-split {
    grid-template-columns: 1fr;
  }
}
.panel-train .panel-split {
  grid-template-columns: minmax(0, 1fr) minmax(360px, 430px);
  align-items: stretch;
}
.panel-train .preview-box {
  justify-self: end;
  width: 100%;
  max-width: 430px;
}
@media (max-width: 1100px) {
  .panel-train .panel-split {
    grid-template-columns: 1fr;
  }
}
.panel-split > * {
  min-width: 0;
}
.form-grid label {
  display: flex;
  flex-direction: column;
  font-size: 12px;
  color: var(--muted);
  gap: 6px;
}
.form-grid input,
.form-grid select {
  background: var(--bg-3);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--fg);
  padding: 10px 12px;
  font-size: 14px;
  outline: none;
}
.form-grid input:focus,
.form-grid select:focus {
  border-color: var(--accent);
}

.preview-row {
  margin-top: 14px;
}
.preview-box {
  background: #06080d;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px;
  position: relative;
  background-image:
    linear-gradient(rgba(255,255,255,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px);
  background-size: 20px 20px;
}
.preview-label {
  font-size: 10px;
  text-transform: uppercase;
  color: var(--muted);
  letter-spacing: 1px;
  margin-bottom: 6px;
}
.preview-box canvas {
  display: block;
  width: 100%;
  height: 180px;
  background: transparent;
  border-radius: 6px;
}

.readouts {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  margin-top: 14px;
}
.readouts > div {
  background: var(--bg-3);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 8px 10px;
  display: flex;
  flex-direction: column;
}
.readouts span { font-size: 11px; color: var(--muted); text-transform: uppercase; }
.readouts b { font-size: 16px; }

.warning {
  margin: 18px 0;
  padding: 10px 14px;
  background: rgba(255,204,77,0.08);
  border: 1px solid rgba(255,204,77,0.4);
  color: var(--warn);
  border-radius: 8px;
  font-size: 13px;
  max-width: 1200px;
}

.cta-row {
  display: flex;
  gap: 12px;
  margin-top: 6px;
}
button.primary, button.ghost, button.ghost-sm {
  border: none;
  cursor: pointer;
  border-radius: 10px;
  font-weight: 600;
  font-size: 14px;
  padding: 12px 22px;
  transition: transform .1s, background .15s, border-color .15s;
}
button.primary {
  background: var(--accent);
  color: #002a17;
}
button.primary:hover { transform: translateY(-1px); }
button.ghost {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--fg);
}
button.ghost:hover { border-color: var(--accent); }
button.ghost-sm {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--fg);
  padding: 6px 10px;
  font-size: 12px;
}
button.ghost-sm:hover { border-color: var(--accent); }

/* ---------------- GAME ---------------- */
#game-screen {
  background: #000;
}
#three-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
}

#crosshair {
  position: absolute;
  left: 50%;
  top: 50%;
  pointer-events: none;
  transform: translate(-50%, -50%);
  z-index: 10;
}

#fps-meter {
  position: absolute;
  left: 12px;
  bottom: 12px;
  z-index: 8;
  padding: 6px 8px;
  border-radius: 8px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.3px;
  color: #d8e1ef;
  background: rgba(8, 11, 18, 0.75);
  border: 1px solid rgba(255, 255, 255, 0.12);
  pointer-events: none;
  user-select: none;
}

#hud {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 5;
}
.hud-row.top {
  display: flex;
  gap: 8px;
  padding: 12px 14px;
  background: linear-gradient(to bottom, rgba(0,0,0,0.55), rgba(0,0,0,0));
  align-items: center;
}
.hud-cell {
  background: rgba(15,18,26,0.7);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: 8px;
  padding: 6px 10px;
  display: flex;
  flex-direction: column;
  min-width: 56px;
}
.hud-cell span { font-size: 10px; text-transform: uppercase; color: var(--muted); }
.hud-cell b { font-size: 14px; }
.hud-actions {
  margin-left: auto;
  display: flex;
  gap: 6px;
  pointer-events: auto;
}

.overlay {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(5,7,12,0.78);
  backdrop-filter: blur(6px);
  z-index: 20;
}
.overlay.hidden { display: none; }
.overlay-card {
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 26px 32px;
  text-align: center;
  max-width: 420px;
}
.overlay-card h2 { margin: 0 0 6px; }
.overlay-card p { color: var(--muted); margin: 0 0 18px; }
.overlay-card .primary { margin-right: 8px; }

/* ---------------- RESULTS ---------------- */
#results-screen {
  display: none;
  padding: 36px;
  background: var(--bg);
}
#results-screen.active { display: flex; align-items: center; justify-content: center; }
.results-card {
  width: 100%;
  max-width: 720px;
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 28px 32px;
}
.results-card h1 { margin: 0 0 18px; }
.result-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  margin-bottom: 20px;
}
.result-grid > div {
  background: var(--bg-3);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px 14px;
  display: flex;
  flex-direction: column;
}
.result-grid span { font-size: 11px; color: var(--muted); text-transform: uppercase; }
.result-grid b { font-size: 20px; }
#res-chart {
  width: 100%;
  height: 160px;
  background: var(--bg-3);
  border: 1px solid var(--border);
  border-radius: 10px;
  margin-bottom: 18px;
}