.new-lessons-shell,.rotation-teacher{--rotation-text:var(--wml-ink,#153956);--rotation-muted:var(--wml-muted,#637f93);--rotation-paper:var(--wml-paper,#fff);--rotation-line:var(--wml-line,#d4e6f1);color:var(--rotation-text);font-family:var(--wml-sans);box-sizing:border-box}
.new-lessons-shell{max-width:940px!important;margin:0 auto!important;padding:0 22px 106px!important;background:var(--wml-bg,#f6fbff)!important;min-height:100vh}
.new-lessons-shell *, .rotation-teacher *{box-sizing:border-box}
.new-lessons-shell[data-student-theme=night]{--rotation-text:#d9efff;--rotation-muted:#a3bfd2;--rotation-paper:#163850;--rotation-line:#36556c;background:#0b2338!important}
.new-lessons-shell .visual-topbar{margin-bottom:22px}
.rotation-back{display:inline-flex;align-items:center;min-height:44px;color:var(--wml-blue-deep);font-size:14px}
.rotation-primary,.rotation-secondary{display:inline-flex;justify-content:center;align-items:center;gap:8px;min-height:48px;padding:12px 20px;border-radius:14px;font-size:15px;font-weight:600;cursor:pointer;text-decoration:none;line-height:1.4}
.rotation-primary{background:linear-gradient(115deg,#169fe6,#087bbd);color:#fff!important;border:1px solid #1598dc;box-shadow:0 7px 18px #0787ca20}
.rotation-primary:hover{filter:brightness(1.05)}.rotation-primary:disabled{background:#e3edf3;border-color:#d5e3ec;box-shadow:none;color:#778f9f!important;cursor:default}
.rotation-secondary{background:var(--rotation-paper,#fff);border:1px solid var(--rotation-line,#d4e6f1);color:var(--wml-blue-deep)}
.rotation-lesson-hero{display:grid;grid-template-columns:1.2fr 1fr;gap:14px;align-items:center;position:relative;isolation:isolate;padding:24px 28px;border:1px solid var(--rotation-line);border-radius:25px;background:linear-gradient(130deg,#e7f6ff,var(--rotation-paper) 65%);overflow:hidden}
.rotation-lesson-hero:before{content:"";position:absolute;z-index:-1;inset:0;background-image:linear-gradient(#53b5df0a 1px,transparent 1px),linear-gradient(90deg,#53b5df0a 1px,transparent 1px);background-size:25px 25px}
.rotation-lesson-hero small,.rotation-question-head small,.rotation-teacher-hero small{display:block;font-size:11px;letter-spacing:.17em;color:#1489c0}
.rotation-lesson-hero h1{font-size:clamp(28px,4vw,44px);line-height:1.3;margin:12px 0}
.rotation-lesson-hero p{font-size:14px;line-height:1.85;color:var(--rotation-muted);max-width:27em}
.rotation-unit{display:inline-block;font-size:11px;padding:6px 10px;border-radius:8px;background:#dff2fc;color:#2977a1}
.rotation-cover{display:block;width:100%;height:auto;max-height:250px;filter:drop-shadow(0 12px 18px #1796cb15);animation:rotationFloat 7s ease-in-out infinite}
@keyframes rotationFloat{50%{transform:translateY(-6px)}}
.rotation-course-card{display:grid;grid-template-columns:1fr 1.3fr;margin-top:24px;overflow:hidden;border:1px solid var(--rotation-line);border-radius:24px;background:var(--rotation-paper);box-shadow:0 16px 40px #1758820a}
.rotation-card-art{padding:22px;background:radial-gradient(circle at 50% 50%,#eafaff,#dcefff);position:relative;display:grid;place-items:center}
.rotation-card-art>span{position:absolute;left:20px;top:18px;color:#3585ad;font-size:11px;letter-spacing:.1em}
.rotation-card-copy{padding:28px}.rotation-card-copy>small{color:var(--rotation-muted);font-size:12px}.rotation-card-copy h2{font-size:32px;margin:9px 0}.rotation-card-copy p{font-size:14px;line-height:1.8;color:var(--rotation-muted)}
.rotation-chips{display:flex;gap:7px;flex-wrap:wrap;margin:12px 0}.rotation-chips span{padding:5px 10px;background:#e9f6fe;color:#287fa7;border-radius:8px;font-size:12px}
.rotation-section{margin-top:24px;padding:24px;border:1px solid var(--rotation-line);border-radius:22px;background:var(--rotation-paper)}
.rotation-section h2{font-size:22px;line-height:1.4;margin:0 0 18px}.rotation-section>p{color:var(--rotation-muted);font-size:14px}
.rotation-section-heading{display:flex;justify-content:space-between;gap:12px;align-items:center;margin-bottom:18px}.rotation-section-heading h2{margin:0}.rotation-section-heading>span{font-size:12px;color:var(--rotation-muted)}
.rotation-knowledge{display:grid;grid-template-columns:repeat(5,1fr);gap:10px}.rotation-knowledge span{padding:14px 10px;border:1px solid var(--rotation-line);border-radius:12px;font-size:13px}.rotation-knowledge b{display:block;color:#169bdf;font-size:21px;margin-bottom:5px}
.rotation-task{display:flex;gap:16px;justify-content:space-between;align-items:center;border-top:1px solid var(--rotation-line);padding:18px 0}.rotation-task:first-child{border:0}.rotation-task p,.rotation-task small{font-size:12px;line-height:1.7;color:var(--rotation-muted);margin:5px 0}.rotation-task .rotation-primary{font-size:13px;flex-shrink:0}
.rotation-empty{padding:14px 0;color:var(--rotation-muted);font-size:14px;line-height:1.9}
.rotation-record{display:flex;justify-content:space-between;gap:12px;padding:16px 0;width:100%;border:0;border-bottom:1px solid var(--rotation-line);background:none;text-align:left;color:var(--rotation-text);cursor:pointer}.rotation-record span{color:var(--rotation-muted);font-size:12px}.rotation-record strong{color:#158ccb;white-space:nowrap}
.rotation-challenge-head{display:flex;justify-content:space-between;align-items:center;font-size:13px;color:var(--rotation-muted)}
.rotation-progress{display:block;width:100%;height:6px;border:0;border-radius:9px;overflow:hidden;accent-color:#159ee1;margin:10px 0 24px}
.rotation-question-head h1{font-size:28px;line-height:1.4;margin:9px 0}.rotation-question-head p{font-size:15px;line-height:1.8;margin-bottom:18px;color:var(--rotation-muted)}
.rotation-experiment{background:linear-gradient(145deg,#fff,#eff9fe);border:1px solid #cce4f1;border-radius:22px;padding:16px;color:#1c5475}
#rotation-board-host{max-width:390px;margin:auto;line-height:0}.rotation-board{display:block;width:100%;height:auto;user-select:none;overflow:visible}.rotation-board.is-drawing{touch-action:none;cursor:crosshair;outline-offset:4px}.rotation-board text{font-family:var(--wml-sans);font-size:16px;fill:#43687f;pointer-events:none}
.rotation-original{fill:#ccdae528;stroke:#8ba9ba;stroke-width:2;stroke-dasharray:5 4;stroke-linejoin:round}.rotation-live-shape{fill:#35a9e64d;stroke:#128acb;stroke-width:2.5;stroke-linejoin:round}
.rotation-point circle{fill:#648faa;stroke:white;stroke-width:2}.rotation-point text{font-size:14px}.rotation-point.placed-point circle{fill:#1398dc}.rotation-point.placed-point text{fill:#0972a5}.rotation-point.rotation-center circle{fill:#f2a14b}.rotation-point.rotation-center text{font-weight:650;fill:#b06a20}.rotation-board [data-corresponding]{cursor:pointer;outline-offset:4px}.rotation-board [data-corresponding]:focus-visible circle{stroke:#f2a14b;stroke-width:3}
.rotation-hand{stroke:#128dce;stroke-width:8;stroke-linecap:round}.rotation-ghost-line{stroke:#9bb2c1;stroke-width:6;stroke-linecap:round;stroke-dasharray:7 6}.rotation-clock-face{fill:white;stroke:#7dc5e9;stroke-width:5}.rotation-ray{stroke:#ee9d42;stroke-width:2;stroke-dasharray:4 3;pointer-events:none}
.rotation-replay-bar{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-top:12px}.rotation-replay-bar button{background:#e3f4ff;border:1px solid #c4e3f5;border-radius:11px;color:#1b79aa;min-height:44px;padding:8px 16px;cursor:pointer}.rotation-replay-bar label{font-size:12px;color:#66869c;display:flex;align-items:center;gap:6px}.rotation-replay-bar input{width:17px;height:17px;accent-color:#1599d8}
.rotation-proof{font-size:12px;line-height:1.8;color:#5e8197;margin:12px 2px 0;min-height:22px}
.rotation-answer-area{margin-top:20px}.rotation-options{padding:0;border:0;margin:0 0 18px;min-width:0}.rotation-options legend{font-size:15px;font-weight:600;color:var(--rotation-text);margin-bottom:10px}.rotation-options>div{display:flex;flex-wrap:wrap;gap:8px}.rotation-options button,.rotation-point-picker button{flex:1;min-width:65px;min-height:48px;padding:11px 12px;border:1px solid var(--rotation-line);border-radius:12px;background:var(--rotation-paper);color:var(--rotation-text);cursor:pointer;font-size:15px}
.rotation-options button[aria-pressed=true],.rotation-point-picker button[aria-pressed=true]{color:#067ab7;background:#e0f3ff;border:2px solid #159ddd;padding:10px 11px;box-shadow:0 3px 10px #159ddd12}
.rotation-answer-status{padding:14px 16px;margin:18px 0 12px;border-radius:13px;background:#eaf5fe;color:#487c9d;font-size:14px}.rotation-answer-status.is-correct{background:#e7f8ef;color:#248a60;font-size:20px;font-weight:600;animation:rotationCorrect .4s ease-out}
@keyframes rotationCorrect{50%{transform:scale(1.02)}}
.rotation-answer-area>.rotation-primary,.rotation-answer-area>.rotation-secondary{width:100%;margin-bottom:10px}.rotation-save-note{text-align:center;color:var(--rotation-muted);font-size:11px;margin:12px 0}
.rotation-point-picker{display:flex;gap:8px}.rotation-drawing-actions{display:flex;gap:8px;align-items:center;margin-top:14px}.rotation-drawing-actions button,.rotation-coordinate-fallback button{min-height:42px;padding:8px 16px;border:1px solid var(--rotation-line);background:var(--rotation-paper);color:var(--rotation-text);border-radius:9px;cursor:pointer}.rotation-drawing-actions>span{margin-left:auto;font-size:12px;color:var(--rotation-muted)}
.rotation-coordinate-fallback{font-size:12px;color:var(--rotation-muted);margin-top:14px}.rotation-coordinate-fallback summary{cursor:pointer;padding:8px 0}.rotation-coordinate-fallback label{display:inline-flex;align-items:center;gap:5px;margin-right:10px}.rotation-coordinate-fallback input{width:60px;padding:8px;border:1px solid var(--rotation-line);border-radius:7px}
.rotation-result{text-align:center;background:var(--rotation-paper);border:1px solid var(--rotation-line);border-radius:25px;padding:32px 24px}.rotation-result-orbit{width:88px;height:88px;border:1px solid #80c9ee;background:radial-gradient(circle,#c9edff,#effaff);box-shadow:0 0 0 10px #dff4ff80,0 0 0 22px #edf9ff70;border-radius:50%;margin:20px auto 32px;color:#1199db;font-size:53px;line-height:88px}.rotation-result>small{font-size:11px;letter-spacing:.17em;color:#1b96c8}.rotation-result h1{font-size:28px}.rotation-result>p{font-size:13px;color:var(--rotation-muted)}.rotation-score{display:block;font-size:70px;color:#138fd0;line-height:1.3}.rotation-score small{font-size:16px;margin-left:6px}.rotation-result-metrics{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;margin:22px 0 30px}.rotation-result-metrics span{padding:14px 5px;background:#edf7fe;color:#5d8099;font-size:11px;border-radius:12px}.rotation-result-metrics b{display:block;font-size:23px;color:#246184;margin-top:7px}.rotation-result h2{font-size:19px;text-align:left;margin-top:26px}.rotation-skill{display:flex;gap:12px;align-items:center;margin:13px 0;font-size:13px}.rotation-skill>span{min-width:70px}.rotation-skill progress{flex:1;min-width:30px;height:8px;accent-color:#20a5df}.rotation-skill>b{min-width:48px;text-align:right;font-size:12px;color:#4090b6}.rotation-feedback-list{text-align:left;background:#eff8fe;padding:8px 14px;border-radius:12px;font-size:13px;line-height:1.8;color:#4a7b98}.rotation-result>.rotation-primary{margin-top:24px;width:100%}
.rotation-teacher{max-width:1240px;margin:auto;padding:8px 8px 60px}.rotation-teacher-hero{display:grid;grid-template-columns:1fr 300px;align-items:center;gap:30px;padding:28px 34px;border:1px solid var(--rotation-line);border-radius:24px;background:linear-gradient(125deg,#e6f5ff,#fff)}.rotation-teacher-hero h1{font-size:36px;line-height:1.4}.rotation-teacher-hero p{color:var(--rotation-muted);font-size:14px}.rotation-teacher-hero .rotation-secondary{margin-left:8px}.rotation-publish-form,.rotation-filter-form{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px;align-items:end}.rotation-publish-form label,.rotation-filter-form label{display:grid;gap:7px;font-size:13px;color:var(--rotation-muted)}.rotation-publish-form input,.rotation-publish-form select,.rotation-filter-form input,.rotation-filter-form select{width:100%;min-width:0;min-height:44px;border:1px solid var(--rotation-line);background:white;border-radius:10px;color:#224965;padding:9px 10px;font:inherit}.rotation-filter-form{grid-template-columns:repeat(4,minmax(0,1fr)) auto auto;margin-top:20px}.rotation-filter-form button,.rotation-teacher-tasks button{min-height:44px;border:1px solid #bcddeb;color:#2179a6;background:#edf8ff;border-radius:10px;padding:9px 14px;cursor:pointer}.rotation-report-tabs{display:flex;gap:8px;border-bottom:1px solid var(--rotation-line);padding-bottom:10px}.rotation-report-tabs button{border:0;background:transparent;padding:10px 20px;color:var(--rotation-muted);border-radius:10px;cursor:pointer;min-height:44px}.rotation-report-tabs [aria-selected=true]{background:#ddf2ff;color:#0b81bc}.rotation-report-note{font-size:12px!important;line-height:1.8}.rotation-stat-grid{display:grid;grid-template-columns:repeat(6,1fr);gap:10px;margin:22px 0}.rotation-stat-grid article{padding:16px 12px;border:1px solid var(--rotation-line);border-radius:13px;background:#f5fbff}.rotation-stat-grid span{display:block;font-size:12px;color:var(--rotation-muted)}.rotation-stat-grid strong{display:block;font-size:28px;color:#138ac4;margin-top:6px}.rotation-table-scroll{width:100%;overflow-x:auto}.rotation-table-scroll table{width:100%;border-collapse:collapse;min-width:580px;font-size:13px}.rotation-table-scroll td,.rotation-table-scroll th{border-bottom:1px solid var(--rotation-line);padding:13px 10px;text-align:left;vertical-align:top}.rotation-table-scroll th{color:var(--rotation-muted);background:#f3faff}.rotation-table-scroll details p{font-size:12px;overflow-wrap:anywhere}.rotation-teacher h3{font-size:19px;margin:26px 0 15px}.rotation-teacher-tasks>article{display:flex;flex-wrap:wrap;align-items:center;gap:12px;justify-content:space-between;padding:15px;border:1px solid var(--rotation-line);border-radius:12px;margin:10px 0}.rotation-teacher-tasks p{font-size:12px;color:var(--rotation-muted)}.rotation-join-card{display:flex;gap:20px;align-items:center;width:100%;padding:20px;background:#eff9ff;border-radius:16px;margin-top:16px}.rotation-join-card canvas{width:145px;height:145px;background:white}.rotation-join-card p{font-size:12px;color:var(--rotation-muted)}.rotation-join-card a{font-size:12px;overflow-wrap:anywhere}
.interactive-course-grid.rotation-library{grid-template-columns:repeat(2,minmax(0,1fr))!important;gap:22px}.rotation-library .interactive-course-card:not(.coming){grid-template-columns:1fr!important;grid-template-rows:230px 1fr}.rotation-library .interactive-course-card.coming{grid-column:1/-1}.rotation-library .interactive-course-visual{min-height:230px!important;position:relative;overflow:hidden}.rotation-library .interactive-course-visual .rotation-cover{position:absolute;width:240px;right:25px;top:0;opacity:.95}.rotation-library .interactive-course-visual.rotation-visual{background:linear-gradient(130deg,#e1f4ff,#eefaff);color:#185778}.rotation-library .rotation-visual>span,.rotation-library .rotation-visual>i{position:relative;z-index:1;color:#297c9f}.rotation-library .rotation-visual strong{font:700 40px var(--wml-serif);position:relative;z-index:1}.rotation-library .interactive-course-copy{padding:28px}.rotation-library .interactive-course-actions{margin-top:auto;padding-top:10px}.rotation-detail-cover{max-width:350px;margin:auto}.rotation-detail-cover .rotation-cover{max-height:none}
@media(max-width:1100px){.rotation-filter-form{grid-template-columns:repeat(3,minmax(0,1fr))}.rotation-stat-grid{grid-template-columns:repeat(3,1fr)}.rotation-publish-form{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:700px){.new-lessons-shell{padding:0 16px 104px!important}.rotation-lesson-hero{padding:22px 18px;grid-template-columns:1fr 115px;gap:3px;border-radius:21px}.rotation-lesson-hero h1{font-size:28px;white-space:nowrap}.rotation-lesson-hero small{font-size:9px;letter-spacing:.08em}.rotation-lesson-hero p{font-size:12px;line-height:1.8}.rotation-unit{font-size:10px;line-height:1.7}.rotation-lesson-hero>.rotation-cover{width:140px;max-width:none;margin-left:-12px}.rotation-course-card{grid-template-columns:1fr}.rotation-card-art{min-height:200px;padding:10px}.rotation-card-art .rotation-cover{height:195px}.rotation-card-copy{padding:22px}.rotation-card-copy .rotation-primary{width:100%}.rotation-section{padding:20px 16px;margin-top:18px;border-radius:19px}.rotation-section h2{font-size:19px}.rotation-knowledge{grid-template-columns:repeat(3,1fr);gap:7px}.rotation-knowledge span{padding:11px 9px;font-size:12px}.rotation-task{flex-direction:column;align-items:stretch;gap:10px}.rotation-section-heading{align-items:flex-start}.rotation-section-heading>span{font-size:10px;white-space:nowrap}.rotation-record{flex-wrap:wrap}.rotation-question-head h1{font-size:25px}.rotation-question-head p{font-size:14px}.rotation-experiment{padding:10px;border-radius:19px}.rotation-options button{font-size:14px;min-height:48px}.rotation-options[data-key=angle] button{flex-basis:20%}.rotation-result{padding:28px 17px}.rotation-result h1{font-size:24px}.rotation-result-metrics b{font-size:21px}.rotation-teacher{padding:0 0 60px}.rotation-teacher-hero{grid-template-columns:1fr;padding:24px}.rotation-teacher-hero>.rotation-cover{display:none}.rotation-teacher-hero h1{font-size:27px}.rotation-teacher-hero .rotation-secondary{margin-left:0;margin-top:10px}.rotation-publish-form,.rotation-filter-form{grid-template-columns:1fr}.rotation-stat-grid{grid-template-columns:repeat(2,1fr)}.rotation-stat-grid strong{font-size:25px}.rotation-join-card{flex-direction:column;align-items:flex-start}.interactive-course-grid.rotation-library{grid-template-columns:1fr!important}.rotation-library .interactive-course-card.coming{grid-column:auto}}
@media(prefers-reduced-motion:reduce){.rotation-cover,.rotation-answer-status.is-correct{animation:none}}

/* Native progress controls and balanced three-course library. */
.rotation-progress::-webkit-progress-bar{background:#dcecf5;border-radius:9px}.rotation-progress::-webkit-progress-value{background:#169de2;border-radius:9px}.rotation-progress::-moz-progress-bar{background:#169de2;border-radius:9px}
.interactive-course-grid.rotation-library{grid-template-columns:repeat(3,minmax(0,1fr))!important}.rotation-library .interactive-course-copy h3{font-size:25px}.rotation-library .interactive-course-visual .rotation-cover{right:-18px;width:210px;opacity:.7}.rotation-library .interactive-course-visual strong{font-size:45px}.rotation-library .rotation-visual strong{font-size:36px}.rotation-library .interactive-course-actions{display:flex;flex-direction:column;align-items:flex-start;gap:10px}.rotation-library .interactive-course-actions>span{font-size:11px;color:#718a9b}.rotation-drawing-actions{flex-wrap:wrap}.rotation-drawing-actions button{padding:8px 11px}
@media(min-width:701px) and (max-width:1100px){.interactive-course-grid.rotation-library{grid-template-columns:repeat(2,minmax(0,1fr))!important}.rotation-library .interactive-course-card:last-child{grid-column:1/-1;grid-template-columns:1fr 1.4fr!important;grid-template-rows:auto}}
@media(max-width:700px){.interactive-course-grid.rotation-library{grid-template-columns:1fr!important}.rotation-library .interactive-course-card:last-child{grid-column:auto}.rotation-drawing-actions>span{font-size:11px}.rotation-drawing-actions button{font-size:12px;padding:8px 10px}}

/* Outrank the existing generic mobile button rule only inside this module. */
#new-lessons-content button.rotation-primary{min-height:48px;font-size:15px;padding:12px 20px;background:linear-gradient(115deg,#169fe6,#087bbd);color:#fff;border:1px solid #1598dc}
#new-lessons-content button.rotation-primary:disabled{background:#e3edf3;color:#657d8f!important;border-color:#d5e3ec;opacity:1}
#new-lessons-content .rotation-options button,#new-lessons-content .rotation-point-picker button{min-height:48px;padding:11px 12px;background:var(--rotation-paper);color:var(--rotation-text);font-size:15px;border:1px solid var(--rotation-line)}
#new-lessons-content .rotation-options button[aria-pressed=true],#new-lessons-content .rotation-point-picker button[aria-pressed=true]{background:#e0f3ff;border:2px solid #159ddd;color:#067ab7;padding:10px 11px}
#new-lessons-content .rotation-replay-bar button{font-size:14px;background:#e3f4ff;color:#1b79aa;padding:8px 16px}

.new-lessons-shell[data-student-theme=night] .rotation-lesson-hero{background:linear-gradient(130deg,#173e58,#102d44)}.new-lessons-shell[data-student-theme=night] .rotation-back{color:#88cfff}.new-lessons-shell[data-student-theme=night] .rotation-lesson-hero small{color:#85c9ed}