.help-popup{position:fixed;top:0;left:0;width:100%;height:100%;background:rgba(0,0,0,.8);display:none;justify-content:center;align-items:center;z-index:2000;-webkit-backdrop-filter:blur(5px);backdrop-filter:blur(5px);opacity:0;transition:all .3s ease}.help-popup.show{display:flex;opacity:1}.help-popup-content{background:white;border-radius:20px;padding:30px;max-width:500px;width:90%;max-height:80vh;overflow-y:auto;box-shadow:0 20px 60px #0000004d;animation:popupSlideIn .3s ease;position:relative;text-align:center}.help-popup-close{position:absolute;top:15px;right:20px;background:none;border:none;font-size:2rem;color:#999;cursor:pointer;transition:all .3s ease;width:40px;height:40px;display:flex;align-items:center;justify-content:center;border-radius:50%}.help-popup-close:hover{color:#dc3545;background:#f8f9fa;transform:rotate(90deg)}.help-popup h3{color:#b52323;font-size:1.3rem;margin-bottom:25px;font-weight:600}.help-kanji{font-size:2rem;color:#2c3e50;margin-bottom:20px;font-weight:700}.help-hiragana{background:#e3f2fd;color:#1976d2;padding:10px;border-radius:15px;font-size:1.6rem;font-weight:600;border:2px solid #bbdefb;margin-bottom:20px}.help-romaji{font-size:1.4rem;color:#495057;margin-bottom:20px;font-weight:500}@keyframes popupSlideIn{0%{transform:scale(.8) translateY(50px);opacity:0}to{transform:scale(1) translateY(0);opacity:1}}