/* AI 解题教练：试卷页与单题解析页共用（DOM 由 public/coach-shared.js 渲染）。 */
.paper-coach,.paper-hint-card,.question-tutor,.question-return{--accent-soft:#f0efff;--yellow-soft:#fffbeb;--green-soft:#eaf7f1;--border-soft:#ececf0}
.paper-coach{margin-top:14px;padding:15px 16px 14px;border:1px solid #c9c5f4;border-top:4px solid var(--accent);border-radius:8px;background:#fbfaff;color:var(--text2);box-shadow:0 7px 16px rgba(81,75,216,.09);font-size:13.5px}
.paper-coach:focus{outline:none}
.paper-coach:focus-visible{outline:3px solid rgba(81,75,216,.24);outline-offset:2px}
.paper-coach.is-bar{display:flex;align-items:center;justify-content:space-between;gap:10px;padding:10px 14px;border-top-width:1px;box-shadow:none;font-size:12.5px;font-weight:650}
.paper-coach.is-bar button{min-height:36px;padding:5px 12px;border:1px solid var(--accent);border-radius:6px;background:#fff;color:var(--accent);font:inherit;font-size:12.5px;font-weight:700;cursor:pointer}
.paper-coach-head{display:flex;align-items:center;gap:10px;margin-bottom:10px}
.paper-coach-head>div{flex:1;min-width:0}
.paper-coach-head strong{display:block;color:var(--text);font-size:15px;line-height:1.3}
.paper-coach-head small{display:block;color:var(--red);font-size:12px;font-weight:650}
.paper-coach-badge{display:inline-flex;flex:0 0 auto;align-items:center;justify-content:center;width:32px;height:32px;border-radius:50%;background:var(--accent);color:#fff;font-size:12px;font-weight:800}
.paper-coach-min{min-height:32px;padding:4px 10px;border:1px solid var(--border);border-radius:6px;background:#fff;color:var(--text3);font:inherit;font-size:12px;cursor:pointer}
.paper-coach-lead,.paper-coach-q{margin:0 0 10px;color:var(--text);font-size:13.5px;line-height:1.7}
.paper-coach-q small{display:block;margin-top:2px;color:var(--text3);font-size:11.5px;font-weight:500}
.paper-coach-key{margin:0 0 12px;padding:10px 12px;border-left:3px solid #d39b22;background:#fff8e8}
.paper-coach-key span,.paper-coach-pitfall span{display:block;margin-bottom:2px;color:#8b620f;font-size:11px;font-weight:800}
.paper-coach-key p,.paper-coach-pitfall{margin:0;color:var(--text);font-size:13.5px;line-height:1.75}
.paper-coach-pitfall{margin-top:10px;padding:9px 11px;border:1px solid #f3d38b;background:var(--yellow-soft);color:#6b4a0c;font-size:12.5px}
.paper-coach-actions{display:flex;flex-wrap:wrap;gap:8px;margin-top:12px}
.paper-coach-actions button,.paper-coach-link{display:inline-flex;min-height:40px;align-items:center;justify-content:center;padding:7px 13px;border:1px solid #cbc9f2;border-radius:6px;background:#fff;color:var(--accent);font:inherit;font-size:13px;font-weight:700;cursor:pointer}
.paper-coach-link:hover{text-decoration:none;background:var(--accent-soft)}
.paper-coach .paper-coach-primary{border-color:var(--accent);background:var(--accent);color:#fff;box-shadow:0 2px 4px rgba(81,75,216,.18)}
.paper-coach .paper-coach-primary:hover{background:var(--accent2)}
.paper-coach button:disabled{opacity:.55;cursor:not-allowed}
.paper-coach-note{margin:10px 0 0;color:var(--text3);font-size:11.5px;line-height:1.6}
.paper-coach-options{display:grid;gap:7px}
.paper-coach-option{display:flex;align-items:flex-start;gap:10px;width:100%;min-height:44px;padding:9px 12px;border:1px solid var(--border);border-radius:6px;background:#fff;color:var(--text2);font:inherit;font-size:13px;text-align:left;cursor:pointer}
.paper-coach-option:hover,.paper-coach-option.is-selected{border-color:var(--accent);background:var(--accent-soft);color:var(--text)}
.paper-coach-option>b{flex:0 0 auto;min-width:18px;color:var(--accent)}
.paper-coach-option>span{min-width:0;overflow-wrap:anywhere}
.paper-coach-tag{display:inline-block;margin-bottom:5px;padding:2px 9px;border-radius:11px;background:#e7e5ff;color:var(--accent);font-size:11.5px;font-weight:800}
.paper-coach-text{margin:0;color:var(--text);font-size:14px;line-height:1.85;overflow-wrap:anywhere}
.paper-coach-extra{margin:8px 0 0;color:var(--text2);font-size:12.75px;line-height:1.7}
.paper-coach-result{margin:0 0 4px;padding:11px 13px;border-radius:6px;border:1px solid var(--border)}
.paper-coach-result strong{display:block;font-size:14.5px}
.paper-coach-result p{margin:3px 0 0;font-size:12.75px}
.paper-coach-result.is-right{border-color:#a7dcc6;background:var(--green-soft);color:#126b4b}
.paper-coach-result.is-wrong{border-color:#f3d38b;background:var(--yellow-soft);color:#6b4a0c}
.paper-coach-variant{margin:0 0 4px;padding:12px 13px;border:1px dashed #cbc9f2;border-radius:6px;background:#fff}
.paper-coach-variant-stem{margin-bottom:10px;color:var(--text);font-size:14px;line-height:1.8;overflow-wrap:anywhere;overflow-x:auto}
.paper-coach-variant-stem p{margin:0 0 6px}
.paper-coach-variant-stem img{max-width:100%;height:auto}
/* 对话：快捷追问 + 本题对话 + 输入框 */
.paper-coach-chat{margin-top:14px;padding-top:12px;border-top:1px solid #e4e2f7}
.paper-coach-thread{display:grid;gap:9px;margin-bottom:10px}
.paper-coach-bubble{max-width:94%;padding:9px 12px;border-radius:10px;font-size:13.5px;line-height:1.8;overflow-wrap:anywhere;overflow-x:auto}
.paper-coach-bubble p{margin:0 0 6px}
.paper-coach-bubble p:last-child,.paper-coach-bubble ul:last-child,.paper-coach-bubble ol:last-child{margin-bottom:0}
.paper-coach-bubble ul,.paper-coach-bubble ol{margin:0 0 6px;padding-left:20px}
.paper-coach-bubble code{padding:1px 4px;border-radius:3px;background:#efeefb;font-size:12.5px}
.paper-coach-bubble.is-me{justify-self:end;background:var(--accent);color:#fff}
.paper-coach-bubble.is-coach{justify-self:start;background:#fff;border:1px solid #dcd9f6;color:var(--text)}
.paper-coach-typing{color:var(--text3);letter-spacing:2px}
.paper-coach-chips{display:flex;flex-wrap:wrap;gap:7px;margin-bottom:9px}
.paper-coach-chip{min-height:36px;padding:5px 12px;border:1px solid #cbc9f2;border-radius:18px;background:#fff;color:var(--accent);font:inherit;font-size:12.5px;font-weight:700;cursor:pointer}
.paper-coach-chip:hover:not(:disabled){background:var(--accent-soft)}
.paper-coach-ask{display:flex;gap:8px}
.paper-coach-ask input{flex:1;min-width:0;min-height:42px;padding:8px 12px;border:1px solid var(--border);border-radius:6px;background:#fff;color:var(--text);font:inherit;font-size:14px}
.paper-coach-ask input:focus-visible{outline:3px solid rgba(81,75,216,.24);outline-offset:1px;border-color:var(--accent)}
.paper-coach-ask button{flex:0 0 auto;min-height:42px;padding:8px 16px;border:0;border-radius:6px;background:var(--accent);color:#fff;font:inherit;font-size:13px;font-weight:700;cursor:pointer}
.paper-coach-visually-hidden{position:absolute;width:1px;height:1px;margin:-1px;padding:0;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}
/* 草稿检查：拍照 / 上传草稿，「检查我的思路」 */
.paper-coach-draft{margin:0 0 10px;padding:11px 12px;border:1px dashed #cbc9f2;border-radius:8px;background:#fff}
.paper-coach-draft-head strong{display:block;color:var(--text);font-size:13px}
.paper-coach-draft-head small{display:block;margin:2px 0 8px;color:var(--text3);font-size:11.5px;line-height:1.6}
.paper-coach-draft-pick{display:inline-flex;min-height:40px;align-items:center;padding:7px 14px;border:1px solid var(--accent);border-radius:6px;background:#fff;color:var(--accent);font-size:13px;font-weight:700;cursor:pointer}
.paper-coach-draft-pick:focus-within{outline:3px solid rgba(81,75,216,.24);outline-offset:2px}
.paper-coach-draft-pick.is-disabled{opacity:.55;cursor:not-allowed}
.paper-coach-draft-preview{display:grid;grid-template-columns:120px minmax(0,1fr);gap:12px;align-items:start}
.paper-coach-draft-preview img{width:120px;max-height:160px;object-fit:cover;border:1px solid var(--border);border-radius:6px;background:#f5f5f7}
.paper-coach-draft-preview textarea{width:100%;min-height:54px;padding:8px 10px;border:1px solid var(--border);border-radius:6px;font:inherit;font-size:13px;resize:vertical}
.paper-coach-draft-preview .paper-coach-actions{margin-top:8px}
.paper-coach-draft-error{margin:0 0 8px;color:var(--red);font-size:12.5px}
@media(max-width:600px){.paper-coach-draft-preview{grid-template-columns:1fr}.paper-coach-draft-preview img{width:100%;max-height:220px}}
/* 单题解析页：返回原卷 + 「哪里没懂？问 AI」 */
.question-return{display:flex;flex-wrap:wrap;align-items:center;gap:4px 16px;margin:12px 0;padding:9px 13px;border:1px solid #cbc9f2;border-radius:8px;background:#fbfaff;font-size:13px}
.question-return a{font-weight:700}
.question-return-state{color:var(--text2);font-size:12.5px}
.question-return-state b{color:var(--text);font-weight:700}
.question-tutor{margin:14px 0;padding:16px 18px;border:1px solid #c9c5f4;border-top:4px solid var(--accent);border-radius:12px;background:#fbfaff}
.question-tutor h2{margin:0 0 3px;font-size:17px}
.question-tutor-lead{margin:0 0 10px;color:var(--text2);font-size:13px;line-height:1.7}
.question-tutor-verify{margin-top:14px;padding-top:12px;border-top:1px solid #e4e2f7}
.question-tutor-verify:first-child{margin-top:0;padding-top:0;border-top:0}
.question-tutor-verify h3{margin:0 0 3px;font-size:15px}
.question-tutor-verify>p{margin:0 0 9px;color:var(--text2);font-size:13px;line-height:1.7}
.question-tutor-verify-start{min-height:42px;padding:8px 16px;border:1px solid var(--accent);border-radius:6px;background:var(--accent);color:#fff;font:inherit;font-size:13.5px;font-weight:700;cursor:pointer}
.question-tutor-verify-start:hover{background:var(--accent2)}
.question-tutor-verify-start:disabled{opacity:.6;cursor:wait}
.question-tutor-verify .paper-coach{margin-top:10px}
@media(max-width:600px){.paper-coach{padding:14px 12px}.paper-coach-actions button,.paper-coach-link,.paper-coach-chip,.paper-coach-option{min-height:44px}.paper-coach-bubble{max-width:100%}.paper-coach-ask button{min-width:68px}.question-tutor{padding:14px 12px}.question-tutor-verify-start{width:100%;min-height:44px}}