:root {
  --si-bg: #f5f4f0;
  --si-card: #ffffff;
  --si-text: #1a1a1a;
  --si-muted: #4c4c4c;
  --si-accent: #2b7a78;
  --si-stage: #0d1021;
  --si-border: rgba(0, 0, 0, 0.08);
  --si-shadow: 0 18px 40px rgba(0, 0, 0, 0.12);
}

@media (prefers-color-scheme: dark) {
  :root {
    --si-bg: #0e0f13;
    --si-card: #171a24;
    --si-text: #f3f4f7;
    --si-muted: #b4b8c5;
    --si-accent: #78ffd6;
    --si-stage: #0b0d18;
    --si-border: rgba(255, 255, 255, 0.08);
    --si-shadow: 0 18px 40px rgba(0, 0, 0, 0.5);
  }
}

.si-card {
  background: var(--si-card);
  border: 1px solid var(--si-border);
  border-radius: 20px;
  box-shadow: var(--si-shadow);
  padding: 20px;
  max-width: 560px;
  margin: 20px auto;
  color: var(--si-text);
  font-family: 'Trebuchet MS', 'Segoe UI', sans-serif;
}

.si-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 12px;
}

.si-title {
  font-size: 20px;
  font-weight: 700;
}

.si-score {
  font-size: 16px;
  color: var(--si-muted);
}

.si-stage {
  position: relative;
  width: 100%;
  aspect-ratio: 3 / 4;
  background: radial-gradient(circle at top, #1b1f3a 0%, var(--si-stage) 65%);
  border-radius: 16px;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.08);
  touch-action: none;
}

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

.si-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 12px;
  background: linear-gradient(135deg, rgba(9, 10, 18, 0.8), rgba(18, 24, 40, 0.8));
  color: #f5f7ff;
  text-align: center;
  padding: 18px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}

.si-overlay.is-visible {
  opacity: 1;
  pointer-events: auto;
}

.si-overlay-title {
  font-size: 22px;
  font-weight: 700;
}

.si-overlay-sub {
  font-size: 14px;
  color: rgba(245, 247, 255, 0.8);
}

.si-button {
  border: none;
  background: var(--si-accent);
  color: #0c1616;
  padding: 10px 18px;
  border-radius: 999px;
  font-weight: 700;
  cursor: pointer;
  letter-spacing: 0.3px;
}

.si-button:focus-visible {
  outline: 2px solid #ffffff;
  outline-offset: 2px;
}

.si-help {
  margin-top: 12px;
  display: flex;
  justify-content: space-between;
  gap: 8px;
  font-size: 13px;
  color: var(--si-muted);
  flex-wrap: wrap;
}

@media (max-width: 520px) {
  .si-card {
    padding: 16px;
    margin: 12px auto;
  }

  .si-header {
    flex-direction: column;
    align-items: flex-start;
  }

  .si-help {
    justify-content: flex-start;
  }
}