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6px;border:0;border-radius:12px;background:var(--surface)}.lesson-segments label{position:relative;flex:1;margin:0;cursor:pointer}.lesson-segments input{position:absolute;opacity:0;inset:0;margin:0;cursor:pointer;min-height:0}.lesson-segments span{display:flex;align-items:center;justify-content:center;min-height:38px;padding:4px 10px;border-radius:9px;font-size:.9rem;font-weight:600;color:var(--muted);text-align:center}.lesson-segments input:checked+span{background:var(--bg);color:var(--ink);box-shadow:0 1px 3px #0000001f}.lesson-segments input:focus-visible+span{outline:3px solid var(--accent);outline-offset:1px}.lesson-add-file{margin-top:14px;padding-top:14px;border-top:1px solid var(--hairline)}.lesson-narrow{max-width:760px}.lesson-preferences .chat-markdown h2{font-size:1.05rem;margin:22px 0 8px}.lesson-preferences .chat-markdown h2:first-child{margin-top:0}.lesson-preferences>.lesson-hint{margin-top:18px;padding-top:12px;border-top:1px solid var(--hairline)}.icon-button:is(a){text-decoration:none}@media(max-width:1000px){.lesson-board{grid-template-columns:repeat(2,minmax(0,1fr))}.lesson-split{grid-template-columns:minmax(0,1fr)}.lesson-chat-col{position:static}.lesson-tabs{display:flex;gap:4px;margin-bottom:14px;border-bottom:1px solid var(--line);scroll-margin-top:12px}.lesson-tabs button{min-height:48px;padding:10px 16px;margin-bottom:-1px;border:0;border-bottom:3px solid transparent;background:transparent;color:var(--muted);font-weight:600}.lesson-tabs button[aria-selected=true]{color:var(--accent);border-bottom-color:var(--accent)}.show-lesson .lesson-chat-col,.show-chat .lesson-main{display:none}.chat.lesson-chat{height:max(420px,calc(100dvh - 90px));max-height:none}}@media(max-width:760px){.lesson-tabs{scroll-margin-top:66px}.chat.lesson-chat{height:max(400px,calc(100dvh - 146px))}}@media(max-width:760px){.lesson-board{grid-template-columns:1fr;gap:22px}.lesson-day-head{grid-template-columns:auto auto 1fr;grid-template-rows:auto;justify-content:start}.lesson-day-date{grid-row:1;width:34px;height:34px;font-size:1.1rem;border-radius:10px}.lesson-day-name{grid-column:2}.lesson-day-month{grid-column:3;grid-row:1}.lessons-top{align-items:flex-start}.lesson-card{padding:16px}.lesson-chat-head{padding:12px 16px}.lesson-form-pair{grid-template-columns:1fr}.lesson-head-course{flex-direction:column;gap:2px}.lesson-head-row{flex-direction:column}}@media(prefers-reduced-motion:reduce){.lesson-working>span{animation:none}}.push-control{max-width:820px;margin-top:24px;border-block:1px solid var(--line)}.push-control>summary{display:flex;align-items:center;gap:10px;min-height:48px;padding:12px 0;cursor:pointer;font-weight:600;color:var(--accent)}.push-control>summary:focus-visible{outline:3px solid var(--accent);outline-offset:4px}.push-chevron{margin-left:auto;flex-shrink:0}.push-control[open] .push-chevron{transform:rotate(180deg)}.push-settings{display:grid;gap:14px;padding-bottom:18px;font-size:.94rem}.push-settings .notice{margin:0}.chat-sidebar .push-control{margin:0 0 12px;border-color:var(--soft-line);flex-shrink:0}.chat-sidebar .push-control>summary{padding-inline:12px;font-size:.9rem}.chat-sidebar .push-settings{padding-inline:12px;font-size:.85rem}.chat-sidebar .push-settings .button{width:100%;padding-inline:10px}