:root {
  --bg: #0e1013;
  --panel: #16191f;
  --panel-soft: #1d2128;
  --border: #2a2f3a;
  --text: #e7eaf0;
  --text-dim: #8a93a6;
  --accent: #7cf7c8;
  --accent-soft: #2b5a4a;
  --danger: #ff7a8a;
  --radius: 10px;
  --font: 'Helvetica Neue', 'Arial', system-ui, -apple-system, 'Segoe UI', sans-serif;
  --mono: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html, body {
  height: 100%;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 15px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a {
  color: var(--accent);
  text-decoration: none;
}
a:hover {
  text-decoration: underline;
}

.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 24px;
  border-bottom: 1px solid var(--border);
  background: var(--panel);
}

.app-header .brand {
  font-family: var(--mono);
  font-size: 16px;
  letter-spacing: 0.02em;
  color: var(--text);
}
.app-header .brand span {
  color: var(--accent);
}

.back-link {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--text-dim);
}
.back-link:hover {
  color: var(--accent);
  text-decoration: none;
}

.app-main {
  flex: 1;
  padding: 32px 24px;
  max-width: 1100px;
  width: 100%;
  margin: 0 auto;
}

.app-footer {
  padding: 16px 24px;
  border-top: 1px solid var(--border);
  color: var(--text-dim);
  font-size: 12px;
  font-family: var(--mono);
  text-align: center;
}

.game-title {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  margin-bottom: 4px;
}
.game-heading {
  font-size: 26px;
  font-weight: 600;
  margin-bottom: 18px;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--panel-soft);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 8px 14px;
  font-family: var(--mono);
  font-size: 13px;
  cursor: pointer;
  transition: background 120ms ease, border-color 120ms ease, color 120ms ease;
}
.btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}
.btn:active {
  transform: translateY(1px);
}
.btn.primary {
  background: var(--accent-soft);
  border-color: var(--accent);
  color: var(--accent);
}
.btn.primary:hover {
  background: var(--accent);
  color: #0b1a14;
}

.hud {
  display: flex;
  gap: 16px;
  align-items: center;
  flex-wrap: wrap;
  font-family: var(--mono);
  font-size: 13px;
  color: var(--text-dim);
}
.hud .stat {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
}
.hud .stat .label {
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 11px;
}
.hud .stat .value {
  color: var(--text);
  font-size: 15px;
}
.hud .spacer {
  flex: 1;
}

.stage {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}

.overlay {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 14px;
  background: rgba(14, 16, 19, 0.88);
  border-radius: var(--radius);
  pointer-events: none;
  opacity: 0;
  transition: opacity 180ms ease;
}
.overlay.show {
  opacity: 1;
  pointer-events: auto;
}
.overlay .title {
  font-size: 22px;
  font-weight: 600;
}
.overlay .sub {
  color: var(--text-dim);
  font-family: var(--mono);
  font-size: 13px;
}