.study-page{min-height:100vh;display:flex;flex-direction:column}.study-progress-bar{height:3px;background:var(--color-border);width:100%;flex-shrink:0}.study-progress-bar-fill{height:100%;background:var(--color-accent);transition:width .3s ease}.study-main{flex:1;display:flex;flex-direction:column;align-items:center;padding:40px 24px 56px;gap:24px}.study-toolbar{display:flex;align-items:center;gap:10px;flex-wrap:wrap;justify-content:center}.study-select{background:var(--color-surface);border:1px solid var(--color-border);border-radius:8px;color:var(--color-text);font-family:var(--font-body);font-size:.9rem;padding:8px 14px;outline:none;cursor:pointer;transition:border-color .15s;max-width:220px}.study-select:focus{border-color:var(--color-accent)}.study-shuffle-btn{display:flex;align-items:center;gap:7px;background:var(--color-surface);border:1px solid var(--color-border);border-radius:8px;color:var(--color-text-secondary);font-family:var(--font-body);font-size:.88rem;font-weight:500;padding:8px 14px;cursor:pointer;transition:border-color .15s,color .15s}.study-shuffle-btn:hover{border-color:var(--color-accent);color:var(--color-text)}.study-shuffle-btn.is-active{border-color:var(--color-accent);color:var(--color-accent)}.study-progress{font-size:.88rem;color:var(--color-text-secondary);min-width:72px;text-align:center}.study-card-area{display:flex;align-items:center;gap:20px}.study-nav-arrow{background:none;border:1px solid var(--color-border);border-radius:10px;color:var(--color-text-secondary);width:48px;height:68px;font-size:2.4rem;line-height:1;cursor:pointer;display:flex;align-items:center;justify-content:center;flex-shrink:0;transition:border-color .15s,color .15s}.study-nav-arrow:hover:not(:disabled){border-color:var(--color-accent);color:var(--color-accent)}.study-nav-arrow:disabled{opacity:.25;cursor:default}.flashcard-scene{perspective:1200px;position:relative;width:min(320px,78vw);cursor:pointer;user-select:none;-webkit-user-select:none;outline:none}.flashcard-fav-btn{position:absolute;top:10px;right:10px;z-index:10;background:#0f11178c;backdrop-filter:blur(6px);-webkit-backdrop-filter:blur(6px);border:none;border-radius:50%;width:40px;height:40px;display:flex;align-items:center;justify-content:center;color:#ffffffb3;cursor:pointer;transition:color .15s,transform .15s,background .15s}.flashcard-fav-btn:hover{color:#fff;transform:scale(1.1);background:#0f1117bf}.flashcard-fav-btn.is-active{color:#e05070}.flashcard-scene:focus-visible{outline:2px solid var(--color-accent);outline-offset:4px;border-radius:16px}.flashcard{width:100%;padding-bottom:139.7%;position:relative;transform-style:preserve-3d;transition:transform .5s cubic-bezier(.4,0,.2,1)}.flashcard.is-flipped{transform:rotateY(180deg)}.flashcard-face{position:absolute;top:0;right:0;bottom:0;left:0;backface-visibility:hidden;-webkit-backface-visibility:hidden;border-radius:14px;overflow:hidden;background:var(--color-surface);box-shadow:0 8px 32px #0000008c}.flashcard-back{transform:rotateY(180deg)}.flashcard-img{width:100%;height:100%;object-fit:cover;display:block}.flashcard-no-en{width:100%;height:100%;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:10px;padding:24px}.flashcard-no-en-name{font-family:var(--font-display);font-size:2rem;letter-spacing:.04em;color:var(--color-text);margin:0;text-align:center}.flashcard-no-en-label{font-size:.82rem;color:var(--color-text-secondary);margin:0}.study-flip-hint{font-size:.78rem;color:var(--color-text-secondary);margin:-8px 0 0;letter-spacing:.02em}.study-card-name{display:flex;align-items:center;gap:10px;font-size:1rem;min-height:1.5em}.study-name-ja{color:var(--color-text);font-weight:500}.study-name-en{color:var(--color-text-secondary)}.pronounce-btn{display:inline-flex;align-items:center;justify-content:center;margin-left:8px;padding:3px 6px;background:none;border:1.5px solid var(--color-border);border-radius:6px;color:var(--color-text-secondary);cursor:pointer;vertical-align:middle;transition:color .15s,border-color .15s}.pronounce-btn:hover{color:var(--color-accent);border-color:var(--color-accent)}.study-empty{width:min(320px,78vw);padding:80px 24px;text-align:center;color:var(--color-text-secondary);font-size:.9rem;border:1px dashed var(--color-border);border-radius:14px}@media (max-width: 600px){.study-main{padding:28px 16px 48px;gap:20px}.study-nav-arrow{width:40px;height:58px;font-size:2rem}.study-card-area{gap:12px}}