.worksheet-menu{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin:25px 0}.worksheet-menu button{display:flex;flex-direction:column;align-items:center;gap:14px;background:#fff9dd;border:3px solid #edda81;border-radius:25px;padding:22px 8px;font-size:24px}.worksheet-menu svg{width:86px;height:86px}.worksheet-paths{display:grid;gap:14px}.worksheet-paths button{background:white;border:3px solid #d3eaf4;border-radius:22px;padding:15px}.worksheet-paths img{width:100%;height:85px;object-fit:contain;display:block}.worksheet-paths span{font-size:18px}.worksheet-paper{position:relative;aspect-ratio:10/3;background:#fff;border:2px solid #d3eaf4;border-radius:18px;overflow:hidden;margin:30px 0}.worksheet-paper>img{position:absolute;inset:0;width:100%;height:100%;object-fit:contain;pointer-events:none}.worksheet-paper canvas{position:absolute;inset:0;width:100%;height:100%;touch-action:none}.worksheet-tools{display:flex;flex-wrap:wrap;gap:9px;margin:20px 0}.worksheet-tools button{font-size:18px;padding:12px 16px;border-radius:18px}.worksheet-tools [aria-pressed=true]{background:#ffdf4b}.worksheet-matching{position:relative;display:grid;grid-template-columns:1fr 1fr;gap:26%;margin:25px 10px}.worksheet-matching>div{display:grid;gap:22px}.worksheet-matching button{position:relative;background:white;border:3px solid #d3eaf4;border-radius:23px;min-height:110px;padding:12px;touch-action:none;user-select:none;-webkit-user-select:none}.worksheet-matching img{height:85px;width:100%;object-fit:contain;pointer-events:none}.worksheet-matching strong{font-size:55px}.worksheet-matching .selected{border-color:#efcb47;background:#fff8dd}.worksheet-matching .matched{border-color:#7bbfa6}.worksheet-links{position:absolute;inset:0;width:100%;height:100%;pointer-events:none;overflow:visible}.worksheet #ws-status{font-size:16px;color:#5c788a}@media(max-width:550px){.worksheet-menu{gap:8px}.worksheet-menu button{font-size:19px;padding:18px 5px}.worksheet-menu svg{width:60px;height:60px}.worksheet-paper{aspect-ratio:10/3}.worksheet-matching{gap:18%;margin:15px 0}.worksheet-matching button{padding:8px;min-height:95px}}

.worksheet-inline{position:absolute;inset:0;z-index:20;background:#e2f4fc;padding:18px 22px;overflow:auto;color:#18344b}.worksheet-inline .worksheet{max-width:1100px;margin:auto}.worksheet-inline h2{font-size:25px;margin:5px 120px 20px 0}.worksheet-close{position:absolute;right:18px;top:15px;padding:10px 15px;border-radius:18px;background:white;font-size:17px}.worksheet-inline .worksheet-paper{margin:12px 0;background:white}.worksheet-inline .worksheet-tools{margin:12px 0}.worksheet-match-paper{position:relative;aspect-ratio:12/7;background:white;border:2px solid #d3eaf4;border-radius:20px;overflow:hidden}.worksheet-match-pictures{position:absolute;inset:12px 20px;display:grid;grid-template-columns:1fr 1fr;gap:36%;pointer-events:none}.worksheet-match-pictures>div{display:flex;flex-direction:column;justify-content:space-around;gap:12px}.worksheet-match-pictures>div>div{display:flex;align-items:center;justify-content:center;flex:1;min-height:0}.worksheet-match-pictures img{width:100%;height:100%;max-height:125px;object-fit:contain}.worksheet-match-pictures strong{font-size:clamp(32px,6vw,70px)}.worksheet-match-paper canvas{position:absolute;inset:0;width:100%;height:100%;touch-action:none}.worksheet-inline .worksheet-paths{grid-template-columns:1fr 1fr}.worksheet-inline .worksheet-paths img{height:70px}@media(max-width:600px){.worksheet-inline{padding:12px}.worksheet-inline h2{font-size:19px;margin-right:100px}.worksheet-close{font-size:14px;right:10px;top:10px}.worksheet-inline .worksheet-tools button{font-size:14px;padding:8px 12px}.worksheet-match-pictures{inset:8px 12px;gap:32%}.worksheet-match-pictures img{max-height:75px}.worksheet-inline #ws-status{font-size:13px;margin:5px 0}}

.worksheet-page-grid,.worksheet-topics{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px;margin:18px 0}.worksheet-page-grid button,.worksheet-topics button{display:flex;flex-direction:column;gap:10px;align-items:center;background:white;border:3px solid #d3eaf4;border-radius:22px;padding:12px;font-size:18px}.worksheet-page-grid img,.worksheet-topics img{width:100%;height:135px;object-fit:contain;pointer-events:none}.worksheet-viewport{max-height:65vh;overflow:auto;overscroll-behavior:contain;border:2px solid #d3eaf4;border-radius:18px;background:#cde8f3}.worksheet-fullpage{position:relative;width:100%;background:white}.worksheet-fullpage>img,.worksheet-fullpage>canvas{position:absolute;inset:0;width:100%;height:100%}.worksheet-fullpage>img{pointer-events:none;user-select:none;-webkit-user-select:none}.worksheet-fullpage>canvas{touch-action:none}.worksheet-sheet-tools{position:sticky;top:0;z-index:2;background:#e2f4fc;padding:7px 0}.worksheet-sheet-tools button{font-size:15px;padding:9px 12px}@media(max-width:600px){.worksheet-page-grid,.worksheet-topics{grid-template-columns:repeat(2,minmax(0,1fr));gap:9px}.worksheet-page-grid img,.worksheet-topics img{height:100px}.worksheet-page-grid button,.worksheet-topics button{font-size:16px}.worksheet-viewport{max-height:55vh}}
/* 笔迹层必须透明：覆盖旧版全局 canvas 的白底和边框，露出原稿。 */
.worksheet .worksheet-paper>canvas,.worksheet .worksheet-match-paper>canvas,.worksheet .worksheet-fullpage>canvas{background:transparent;border:0;border-radius:0;z-index:1}

/* 全屏独立滚动；画布内部保留画笔手势。 */
#worksheet-inline{position:fixed;inset:0;width:100%;height:100%;max-height:100dvh;overflow-y:auto;overflow-x:hidden;-webkit-overflow-scrolling:touch;overscroll-behavior-y:contain;touch-action:pan-y;z-index:45;padding-bottom:40px} .worksheet-viewport{-webkit-overflow-scrolling:touch}

.worksheet-word-strip{display:flex;gap:12px;justify-content:center;flex-wrap:wrap;margin:15px 0}.worksheet-word-strip button{display:flex;align-items:center;gap:8px;background:white;border:2px solid #bfe4f4;border-radius:18px;padding:10px 16px;font-size:20px}.worksheet-word-strip img{width:65px;height:60px;object-fit:contain;pointer-events:none}