:root{--bg:#fafafa;--text:#222;--border:#ccc}
@media(prefers-color-scheme:dark){:root{--bg:#1a1a2e;--text:#ddd;--border:#444}}
*{box-sizing:border-box;margin:0;padding:0}
body{font-family:-apple-system,system-ui,sans-serif;background:var(--bg);color:var(--text);display:flex;flex-direction:column;align-items:center;min-height:100vh;padding:20px}
h1{font-size:2rem;margin-bottom:4px}
.subtitle{color:#888;margin-bottom:16px;font-size:.95rem}
.controls{display:flex;flex-wrap:wrap;gap:8px;align-items:center;justify-content:center;margin-bottom:16px}
.controls label{font-weight:600;font-size:.85rem}
.controls select,.controls button{padding:7px 13px;border-radius:6px;border:1px solid var(--border);font-size:.9rem;cursor:pointer;background:var(--bg);color:var(--text);font-family:inherit}
.controls button{background:#333;color:#fff;border:none;font-weight:600;transition:background .2s}
.controls button:hover{background:#555}
.controls button:disabled{background:#999;cursor:not-allowed}
canvas{display:block;margin:0 auto 8px;border-radius:4px;box-shadow:0 2px 12px rgba(0,0,0,.15);cursor:pointer}
.action-row{display:flex;gap:8px;justify-content:center;margin-bottom:6px}
.action-row button{padding:6px 14px;border-radius:6px;border:1px solid var(--border);background:var(--bg);color:var(--text);cursor:pointer;font-size:.9rem;font-family:inherit}
.action-row button:hover{background:#e8e8e8}
.info-bar{margin-top:4px;font-size:.82rem;color:#888;display:flex;gap:16px;justify-content:center;flex-wrap:wrap;text-align:center}
.info-bar .warn{color:#c44;font-weight:600}
.info-bar .ok{color:#4a4}
.rules{max-width:460px;margin:20px auto;padding:14px;border:1px solid var(--border);border-radius:8px;font-size:.88rem;line-height:1.6}
.rules h3{margin-bottom:6px}
.spinner{display:inline-block;width:16px;height:16px;border:2px solid #fff;border-top-color:transparent;border-radius:50%;animation:spin .6s linear infinite;vertical-align:middle;margin-right:6px}
@keyframes spin{to{transform:rotate(360deg)}}
@media print{body{padding:0}.controls,.info-bar,.rules,h1,.subtitle{display:none}canvas{box-shadow:none;border-radius:0;page-break-inside:avoid}}

.training-note{margin-top:8px;color:#888;display:none}.instructions{margin-top:8px;color:#888}