:root{--ink: #1A1A2E;--paper: #FFFFFF;--parchment: #F4EFE6;--charcoal: #2A2D43;--sunset: #FF6B4A;--sky: #3DB4FF;--leaf: #5BD17A;--sunlight: #FFD23F;--dojang-red: #C8102E;--dojang-blue: #003478}*{box-sizing:border-box;margin:0;padding:0}html,body{width:100%;height:100%;overflow:hidden}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Nunito,"Baloo 2",system-ui,sans-serif;font-size:22px;color:var(--ink);background:var(--parchment);-webkit-tap-highlight-color:transparent;-webkit-user-select:none;user-select:none;touch-action:manipulation}#app{width:100%;height:100%;position:relative}.boot-screen{width:100%;height:100%;display:flex;flex-direction:column;align-items:center;justify-content:center;background:linear-gradient(180deg,var(--sunset) 0%,var(--dojang-red) 100%);color:var(--paper);text-align:center;padding:24px}.boot-screen h1{font-size:56px;font-weight:800;margin-bottom:8px}.boot-tag{font-size:28px;opacity:.9;margin-bottom:32px}.boot-status{font-size:22px;min-height:32px;margin-bottom:32px}.boot-status.error{color:var(--sunlight)}.boot-start{font-size:32px;padding:18px 48px;border-radius:16px;background:var(--sky);color:var(--ink);border:4px solid var(--ink);cursor:pointer;min-width:240px;min-height:80px;font-weight:700;font-family:inherit}.boot-start:active{transform:translateY(2px)}#phaser-mount{width:100%;height:100%}canvas{display:block}.modal-backdrop{position:absolute;inset:0;background:#1a1a2ed9;display:flex;align-items:center;justify-content:center;z-index:100}.modal-card{background:var(--paper);border:4px solid var(--ink);border-radius:16px;padding:24px;width:min(900px,90vw);max-height:85vh;overflow-y:auto;display:flex;flex-direction:column;gap:16px}.modal-card.math{border-color:var(--sky);border-width:6px}.modal-card.science{border-color:var(--leaf);border-width:6px}.modal-card.english{border-color:var(--sunlight);border-width:6px}.modal-stem{font-size:36px;line-height:1.3;font-weight:700;text-align:center;padding:16px}.modal-choices{display:grid;grid-template-columns:1fr 1fr;gap:12px}.modal-choice{font-size:28px;font-weight:600;padding:20px;min-height:80px;background:var(--paper);color:var(--ink);border:3px solid var(--ink);border-radius:12px;cursor:pointer;font-family:inherit}.modal-choice:active{background:var(--sunlight)}.modal-choice.correct{background:var(--leaf)}.modal-choice.wrong{background:var(--dojang-red);color:var(--paper)}.modal-actions{display:flex;gap:12px;justify-content:space-between;align-items:center}.modal-btn{font-size:24px;font-weight:600;padding:12px 24px;min-height:60px;background:var(--sky);color:var(--ink);border:3px solid var(--ink);border-radius:10px;cursor:pointer;font-family:inherit}.modal-btn.secondary{background:var(--paper)}.modal-btn:disabled{opacity:.4}.modal-explanation{font-size:22px;line-height:1.4;padding:12px;background:var(--parchment);border-radius:8px;text-align:center}.modal-toast{position:absolute;top:16px;left:50%;transform:translate(-50%);background:var(--charcoal);color:var(--paper);padding:12px 24px;border-radius:12px;font-size:22px;font-weight:600;z-index:200}.update-toast{position:absolute;top:16px;right:16px;background:var(--sunset);color:var(--paper);padding:12px 20px;border-radius:12px;font-size:22px;font-weight:600;border:3px solid var(--ink);cursor:pointer;z-index:250;font-family:inherit}