.lesson-content{min-width:0}.lesson-jumps{display:flex;flex-wrap:wrap;gap:8px;margin:18px 0 28px}.lesson-jumps button{background:#fff;border:1px solid var(--line);border-radius:9px;padding:10px 13px;font-size:13px;color:var(--teal)}.lesson-jumps button:hover{background:var(--mint)}.lesson-section{margin:30px 0;scroll-margin-top:110px}.section-label{color:var(--teal);font-size:12px;font-weight:750;letter-spacing:1px;margin:0 0 12px 4px}.material-tools{border-top:1px solid var(--line);margin-top:25px;padding-top:20px}.book-page{background:var(--paper);border:1px solid var(--line);border-radius:12px;padding:16px}.book-page summary{font-size:14px;font-weight:700;cursor:pointer}.book-page img{display:block;width:100%;height:auto;margin:18px auto 12px;border:1px solid var(--line);background:white}.book-page a{font-size:13px}.video-heading{margin-top:24px}.video-heading p{font-size:13px;color:var(--muted);margin:6px 0 15px}.video-list{display:grid;gap:14px}.video-card{display:flex;gap:17px;background:#f3f7f2;border:1px solid var(--line);border-radius:15px;padding:20px}.video-card>div:last-child{min-width:0}.video-symbol{display:grid;place-items:center;flex:none;background:var(--ink);color:var(--lime);border-radius:14px;width:51px;height:51px;font-size:21px}.video-card h3{font-size:18px;margin:9px 0 4px}.video-source{font-size:12px;color:var(--muted);overflow-wrap:anywhere}.watch-prompt{font-size:14px;margin:14px 0}.watch-prompt strong{display:block;font-size:12px;color:var(--teal);margin-bottom:4px}.video-links{display:flex;align-items:center;flex-wrap:wrap;gap:15px}.video-links>a:last-child{font-size:12px}.book-banner,.reply-notice{display:flex;align-items:center;justify-content:space-between;gap:20px;padding:22px 25px;border-radius:15px;border:1px solid var(--line);margin:0 0 25px;background:white}.book-banner p,.reply-notice p{font-size:13px;color:var(--muted);margin-top:5px}.reply-notice{background:var(--mint)}.questions-page{padding-top:38px;padding-bottom:50px;max-width:950px}.questions-page .intro{margin-top:15px;color:var(--muted)}.discussion-list{display:grid;gap:20px;margin-top:23px}.discussion-card{background:white;border:1px solid var(--line);border-radius:18px;padding:25px;min-width:0}.discussion-meta{display:flex;align-items:center;gap:12px;flex-wrap:wrap;font-size:12px;color:var(--muted);padding-bottom:18px;border-bottom:1px solid var(--line)}.status-waiting{background:var(--orange);color:#805027}.status-answered{background:var(--blue);color:#355e90}.status-resolved{background:var(--mint);color:var(--teal)}.unread{color:var(--teal)}.messages{display:grid;gap:12px;margin:19px 0}.message{border:1px solid var(--line);background:#fafbf8;border-radius:12px;padding:15px 17px}.message.parent-message{background:var(--mint);border-color:#c9e2d8;margin-left:20px}.message>div{display:flex;flex-wrap:wrap;justify-content:space-between;gap:8px;font-size:12px}.message time{color:var(--muted);font-size:11px}.message p{white-space:pre-wrap;overflow-wrap:anywhere;font-size:14px;margin-top:9px}.reply-editor{border-top:1px solid var(--line);margin-top:18px;padding-top:17px}.reply-editor summary{cursor:pointer;font-size:14px;color:var(--teal);font-weight:700}.reply-editor form>small{display:block;margin-top:12px}.resolve-check{display:flex;align-items:center;gap:8px;font-size:13px}.resolve-check input{width:18px;height:18px;accent-color:var(--teal)}.form-field textarea{width:100%;padding:12px 14px;border:1px solid #b7ccc4;border-radius:9px;background:white;color:var(--ink);font:inherit;resize:vertical;min-height:110px;line-height:1.8}.form-field textarea:focus-visible{outline:3px solid #cb7b2d;outline-offset:3px}.thread-actions{margin-top:8px}.empty-state{padding:30px 22px;border:1px dashed #bccfc3;border-radius:13px;color:var(--muted);font-size:14px;background:#f0f5ee}.question-intro .section-head{align-items:start}.question-intro .section-head .text-btn{white-space:nowrap}.nav{gap:18px}.nav button{white-space:nowrap}.questions-page h1{font-size:34px}
@media(max-width:720px){.lesson-jumps{gap:7px;display:grid;grid-template-columns:1fr 1fr}.lesson-jumps button{font-size:12px;padding:10px 7px}.lesson-section{scroll-margin-top:140px}.book-banner,.reply-notice{padding:18px;align-items:start;flex-direction:column;gap:14px}.book-banner .btn{width:100%;font-size:13px}.video-card{padding:17px 14px;gap:12px}.video-symbol{width:34px;height:34px;border-radius:9px;font-size:14px}.video-card h3{font-size:16px}.video-card .tag{font-size:10px}.watch-prompt{font-size:13px}.book-page{padding:13px}.book-page summary{font-size:13px}.discussion-card{padding:18px 15px}.discussion-meta{gap:8px}.message{padding:13px}.message.parent-message{margin-left:8px}.message p{font-size:13px}.question-intro .section-head{flex-direction:column;gap:4px}.questions-page{padding-top:27px;padding-bottom:35px}.questions-page h1{font-size:28px}.questions-page .intro{font-size:14px}.nav{gap:20px;overflow-x:auto}.nav button{flex:none}.header-inner{gap:8px}.profile{max-width:54%}.user-chip{max-width:85px!important}.form-field textarea{font-size:16px}}