.course-tools{display:flex;gap:12px;flex-wrap:wrap;align-items:end;margin:24px 0;padding:18px;background:var(--panel);border:1px solid var(--line);border-radius:14px}
.course-tools label{display:grid;gap:6px;color:var(--muted);font:12px "JetBrains Mono",monospace}
.course-tools input,.course-tools select{min-width:170px;background:var(--bg2);border:1px solid var(--line);border-radius:9px;color:var(--ink);padding:10px 12px;font:13px "Manrope",sans-serif}
.course-tools input:focus,.course-tools select:focus{outline:2px solid var(--cyan);outline-offset:2px}
.course-summary{margin-left:auto;color:var(--muted);font:12px "JetBrains Mono",monospace;padding:10px 0}
.course-grade{margin-top:28px;border:1px solid var(--line);border-radius:16px;overflow:hidden;background:var(--panel)}
.course-grade[hidden]{display:none}
.course-grade-head{display:flex;justify-content:space-between;gap:18px;align-items:center;padding:18px 20px;background:linear-gradient(110deg,rgba(34,211,238,.12),transparent 62%);border-bottom:1px solid var(--line)}
.course-grade-head h2{margin:0;font-size:22px}.course-grade-head p{margin:3px 0 0;color:var(--muted);font-size:13px}.course-grade-count{font:12px "JetBrains Mono",monospace;color:var(--cyan);white-space:nowrap}
.course-chapter{border-bottom:1px solid var(--line)}.course-chapter:last-child{border-bottom:0}.course-chapter[hidden]{display:none}
.course-chapter summary{list-style:none;display:grid;grid-template-columns:58px 1fr auto;gap:14px;align-items:center;padding:15px 20px;cursor:pointer}.course-chapter summary::-webkit-details-marker{display:none}.course-chapter summary:hover{background:rgba(34,211,238,.05)}
.course-chapter summary:focus-visible{outline:2px solid var(--cyan);outline-offset:-2px}.course-chapter[open] summary{background:rgba(34,211,238,.04)}
.course-number{font:700 13px "JetBrains Mono",monospace;color:var(--cyan)}.course-title{font-weight:800}.course-meta{font:11px "JetBrains Mono",monospace;color:var(--muted)}
.course-pages{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;padding:0 20px 18px 92px}.course-page{display:block;padding:13px;border:1px solid var(--line);border-radius:10px;background:var(--bg2);color:var(--ink);text-decoration:none}.course-page:hover{border-color:var(--cyan);text-decoration:none;transform:translateY(-1px)}.course-page b{display:block;font-size:13px}.course-page span{display:block;color:var(--muted);font-size:11px;margin-top:4px}
.formula-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:12px;margin:16px 0}
.formula-card{position:relative;padding:18px 16px 16px;border:1px solid var(--line);border-radius:12px;background:linear-gradient(145deg,rgba(252,211,77,.055),transparent 55%),var(--panel2);overflow:hidden}
.formula-card::before{content:"";position:absolute;inset:0 auto 0 0;width:3px;background:linear-gradient(var(--amber),var(--cyan))}
.formula-card>.formula-math{display:flex;align-items:center;justify-content:center;min-height:48px;margin-bottom:9px;color:var(--amber);font-size:18px;overflow-x:auto;overflow-y:hidden}
.formula-card>.formula-math .katex-display{text-align:center}
.formula-card>span{display:block;font-size:13px;color:var(--muted);text-align:center}
.concept-strip{display:flex;gap:8px;flex-wrap:wrap;margin:14px 0}.concept-strip span{padding:5px 9px;border:1px solid var(--line);border-radius:999px;background:var(--bg2);color:var(--cyan);font:11px "JetBrains Mono",monospace}
.physics-demo{margin-top:16px}.demo-controls{display:grid;grid-template-columns:repeat(2,minmax(180px,1fr));gap:14px;margin-bottom:14px}.demo-control{padding:12px;border:1px solid var(--line);border-radius:10px;background:var(--bg2)}.demo-control label{display:flex;justify-content:space-between;gap:10px;color:var(--muted);font-size:12px}.demo-control output{color:var(--cyan);font:700 12px "JetBrains Mono",monospace}.demo-control input{margin-top:10px}
.demo-stage{position:relative;border:1px solid var(--line);border-radius:12px;background:var(--bg2);overflow:hidden}.demo-stage canvas{display:block;width:100%;height:340px;filter:none}.demo-readout{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;margin-top:10px}.demo-readout div{padding:10px;border:1px solid var(--line);border-radius:9px;background:var(--bg2);text-align:center}.demo-readout b{display:block;color:var(--cyan);font:700 14px "JetBrains Mono",monospace}.demo-readout span{font-size:11px;color:var(--muted)}
.visual-note{margin-top:12px;color:var(--muted);font-size:13px;line-height:1.6}.curriculum-note{padding:16px 18px;border:1px solid rgba(167,139,250,.35);border-radius:12px;background:rgba(167,139,250,.06);color:var(--ink);font-size:13px}
.learning-outcomes{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin:16px 0}.learning-outcome{padding:14px;border:1px solid var(--line);border-radius:11px;background:var(--panel2);font-size:13px;line-height:1.55}.learning-outcome b{display:block;color:var(--cyan);font:11px "JetBrains Mono",monospace;margin-bottom:5px;text-transform:uppercase}
.term-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:10px;margin:16px 0}.term-card{padding:14px 16px;border:1px solid var(--line);border-radius:11px;background:var(--panel2)}.term-card dt{color:var(--cyan);font-weight:800;margin-bottom:5px}.term-card dd{margin:0;color:var(--ink);font-size:13px;line-height:1.55}
.formula-deep{margin:16px 0;border:1px solid var(--line);border-radius:13px;background:var(--panel);overflow:hidden}
.formula-deep-head{display:flex;gap:16px;align-items:center;justify-content:space-between;padding:15px 18px;background:linear-gradient(100deg,rgba(252,211,77,.07),transparent 58%),var(--bg2);border-bottom:1px solid var(--line)}
.formula-deep-head>.formula-math{min-width:0;color:var(--amber);font-size:18px;overflow-x:auto;overflow-y:hidden}
.formula-math .katex-display{margin:0;text-align:left}
.formula-math .katex{white-space:nowrap}
.law-kind{flex:0 0 auto;padding:4px 8px;border-radius:999px;border:1px solid rgba(167,139,250,.4);color:var(--violet);font:10px "JetBrains Mono",monospace;text-transform:uppercase}
.formula-deep-body{padding:16px}.formula-deep-body>p{font-size:13.5px;line-height:1.65}
.formula-origin{display:grid;gap:10px;counter-reset:derive;margin:14px 0}
.derive-step{display:grid;grid-template-columns:28px minmax(0,1fr);gap:10px;align-items:start;font-size:13px;line-height:1.55}
.derive-step::before{counter-increment:derive;content:counter(derive);display:flex;align-items:center;justify-content:center;width:24px;height:24px;margin-top:8px;border-radius:50%;background:rgba(34,211,238,.1);border:1px solid rgba(34,211,238,.3);color:var(--cyan);font:11px "JetBrains Mono",monospace}
.derive-content{min-width:0;padding:10px 12px;border:1px solid rgba(34,211,238,.14);border-radius:10px;background:rgba(34,211,238,.025)}
.derive-math{margin-bottom:7px;padding-bottom:7px;border-bottom:1px solid rgba(34,211,238,.12);color:var(--cyan);font-size:15px;overflow-x:auto;overflow-y:hidden}
.derive-copy{color:var(--ink)}
.formula-conditions{margin-top:13px;padding:11px 13px;border-left:3px solid var(--violet);background:rgba(167,139,250,.06);font-size:12.5px;line-height:1.6}
.misconception-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:10px}.misconception{padding:14px;border:1px solid rgba(248,113,113,.32);border-radius:11px;background:rgba(248,113,113,.04);font-size:13px;line-height:1.55}.misconception b{display:block;color:var(--red);margin-bottom:5px}.misconception.correct{border-color:rgba(52,211,153,.32);background:rgba(52,211,153,.04)}.misconception.correct b{color:var(--green)}
.topic-extension{padding:18px;border:1px solid rgba(252,211,77,.35);border-radius:13px;background:rgba(252,211,77,.04);margin:16px 0}.topic-extension h3{margin:0 0 9px;color:var(--amber);font-size:17px}.topic-extension p,.topic-extension li{font-size:13.5px;line-height:1.65}.source-note{margin:28px 0 10px;padding:13px 16px;border-top:1px solid var(--line);border-bottom:1px solid var(--line);color:var(--muted);font-size:11.5px;line-height:1.6}
details.advanced-note{margin:14px 0;border:1px solid var(--line);border-radius:11px;background:var(--bg2)}details.advanced-note summary{cursor:pointer;padding:12px 14px;color:var(--violet);font-weight:700;font-size:13px}details.advanced-note>div{padding:0 14px 14px;font-size:13px;line-height:1.65}
@media(max-width:760px){.course-tools{align-items:stretch}.course-tools label{flex:1 1 100%}.course-tools input,.course-tools select{width:100%}.course-summary{margin-left:0}.course-chapter summary{grid-template-columns:44px 1fr}.course-meta{grid-column:2}.course-pages{grid-template-columns:1fr;padding-left:64px}.demo-controls{grid-template-columns:1fr}.demo-stage canvas{height:280px}.demo-readout{grid-template-columns:1fr}.course-grade-head{align-items:flex-start;flex-direction:column}.learning-outcomes,.term-grid,.misconception-grid{grid-template-columns:1fr}.formula-deep-head{align-items:flex-start;flex-direction:column}}
@media(prefers-reduced-motion:reduce){.course-page{transition:none}.course-page:hover{transform:none}}
@media(max-width:760px){.formula-card>.formula-math,.formula-deep-head>.formula-math{font-size:16px;max-width:100%}.formula-deep-head{width:100%}.derive-content{padding:9px 10px}.derive-math{font-size:14px}.formula-math .katex-display{min-width:max-content}}
.physics-activity-section{position:relative}.activity-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px;align-items:start}.physics-activity{margin:0;padding:0;overflow:hidden;background:var(--panel);border:1px solid var(--line);border-radius:14px}.physics-activity .iv-head{padding:15px 16px 8px}.physics-activity .iv-sub{padding:0 16px 13px;border-bottom:1px solid var(--line)}.activity-body{display:grid;gap:14px;padding:16px}.activity-prompt{margin:0;color:var(--ink);font-size:13px;line-height:1.6}.activity-options{display:grid;gap:8px}.activity-action{border:1px solid var(--line);border-radius:9px;background:var(--bg2);color:var(--ink);padding:9px 12px;font:600 12px "Manrope",sans-serif;cursor:pointer}.activity-action:hover,.activity-action.selected{border-color:var(--cyan);background:rgba(34,211,238,.09)}.activity-action:focus-visible,.flash-card:focus-visible,.match-row select:focus-visible{outline:2px solid var(--cyan);outline-offset:2px}.activity-action.primary{justify-self:start;border-color:rgba(34,211,238,.45);color:var(--cyan)}.formula-option{font:600 13px "JetBrains Mono",monospace;text-align:left}.activity-feedback{padding:11px 16px;border-top:1px solid var(--line);color:var(--muted);font-size:12px;line-height:1.5}.activity-feedback.ok{color:var(--green);background:rgba(52,211,153,.05)}.activity-feedback.bad{color:var(--red);background:rgba(248,113,113,.05)}.match-list,.claim-list{display:grid;gap:10px}.match-row,.claim-row{padding:12px;border:1px solid var(--line);border-radius:10px;background:var(--bg2)}.match-row p,.claim-row p{margin:0 0 10px;font-size:12.5px;line-height:1.55}.match-select-label{display:grid;gap:5px;color:var(--muted);font-size:10px;text-transform:uppercase}.match-row select{width:100%;padding:9px;border:1px solid var(--line);border-radius:8px;background:var(--panel);color:var(--ink)}.match-row select.correct,.claim-row.correct{border-color:var(--green)}.match-row select.incorrect,.claim-row.incorrect{border-color:var(--red)}.order-list{display:grid;gap:8px;margin:0;padding:0;list-style:none;counter-reset:activity-step}.order-item{counter-increment:activity-step;display:grid;grid-template-columns:26px 1fr auto;gap:9px;align-items:center;padding:10px;border:1px solid var(--line);border-radius:9px;background:var(--bg2);font-size:12px;line-height:1.5}.order-item::before{content:counter(activity-step);display:grid;place-items:center;width:23px;height:23px;border-radius:50%;background:rgba(167,139,250,.12);color:var(--violet);font:11px "JetBrains Mono",monospace}.order-controls,.claim-controls,.flash-controls{display:flex;gap:7px;align-items:center}.order-controls .activity-action{padding:5px 8px}.claim-controls .activity-action{flex:1}.flash-card{display:grid;place-items:center;width:100%;min-height:150px;padding:22px;border:1px solid rgba(167,139,250,.4);border-radius:12px;background:radial-gradient(circle at top right,rgba(167,139,250,.14),transparent 55%),var(--bg2);color:var(--violet);font:800 18px "Manrope",sans-serif;line-height:1.45;cursor:pointer}.flash-card.revealed{color:var(--ink);font-size:13px;font-weight:600}.flash-controls{justify-content:space-between}.flash-position{color:var(--muted);font:11px "JetBrains Mono",monospace}
@media(max-width:900px){.activity-grid{grid-template-columns:1fr}}
.course-map{max-width:1180px}.course-map-tools{display:flex;flex-wrap:wrap;gap:10px;align-items:end;margin:24px 0 12px;padding:16px;border:1px solid var(--line);border-radius:14px;background:var(--panel)}.course-map-search{display:grid;gap:6px;min-width:260px;flex:1;color:var(--muted);font:12px "JetBrains Mono",monospace}.course-map-search input{width:100%;padding:10px 12px;border:1px solid var(--line);border-radius:9px;background:var(--bg2);color:var(--ink);font:13px "Manrope",sans-serif}.course-map-search input:focus{outline:2px solid var(--cyan);outline-offset:2px}.course-map-chips{display:flex;flex-wrap:wrap;gap:7px}.map-chip{min-width:34px;padding:8px 10px;border:1px solid var(--line);border-radius:999px;background:var(--bg2);color:var(--muted);font:700 12px "JetBrains Mono",monospace;cursor:pointer}.map-chip:hover{border-color:var(--cyan);color:var(--ink)}.map-chip.active{border-color:var(--cyan);background:var(--cyan);color:#04121f}.course-map-count{margin-left:auto;padding:9px 0;color:var(--muted);font:12px "JetBrains Mono",monospace}.course-map-legend{display:flex;flex-wrap:wrap;gap:16px;margin:0 0 14px;color:var(--muted);font-size:12px}.course-map-table-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:14px;background:var(--panel)}.course-map-table{width:100%;border-collapse:collapse;table-layout:fixed;font-size:13px}.course-map-table th{position:sticky;top:0;z-index:1;padding:9px 10px;border-bottom:2px solid var(--line);background:var(--bg2);color:var(--cyan);text-align:left;text-transform:uppercase;letter-spacing:.5px;font-size:10px}.course-map-table th:nth-child(1){width:72px}.course-map-table th:nth-child(3){width:56px}.course-map-table th:nth-child(4),.course-map-table th:nth-child(5){width:220px}.course-map-table td{padding:9px 10px;border-bottom:1px solid var(--line);vertical-align:middle}.course-map-table tr:last-child td{border-bottom:0}.course-map-table .sectionhead td{padding:11px 12px;border-top:1px solid var(--line);background:var(--panel2);font-weight:800}.course-map-table .sec-label{margin-left:5px;color:var(--muted);font-weight:400;font-size:11px}.map-chapter{cursor:pointer}.map-chapter:hover td,.map-topic:hover td{background:rgba(34,211,238,.05)}.map-chapter td:nth-child(1){white-space:nowrap}.map-toggle{display:inline-flex;align-items:center;justify-content:center;width:20px;height:20px;margin-right:6px;padding:0;border:1px solid var(--line);border-radius:5px;background:var(--bg2);color:var(--cyan);font-size:10px;cursor:pointer;transition:transform .2s}.map-chapter.open .map-toggle{transform:rotate(90deg)}.course-map-table .ch-num{color:var(--cyan);font:700 12px "JetBrains Mono",monospace}.course-map-table .ch-title-wrap{display:flex;align-items:center;gap:8px;min-width:0}.course-map-table .ch-title{min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-weight:800}.course-map-table .ch-badge-link{flex-shrink:0;margin-left:auto;padding:2px 6px;border:1px solid rgba(34,211,238,.28);border-radius:5px;background:rgba(34,211,238,.07);color:var(--cyan);text-decoration:none;font:10px "JetBrains Mono",monospace}.course-map-table .ch-badge-link:hover{border-color:var(--cyan);background:rgba(34,211,238,.14)}.map-topic{display:none}.map-topic.open{display:table-row}.map-topic td{background:rgba(34,211,238,.015)}.map-topic .sub-num{color:var(--muted);font:10px "JetBrains Mono",monospace}.map-topic .sub-link,.tb-static .sub-link{color:var(--muted);font-weight:600;text-decoration:none}.map-topic .sub-link:hover,.tb-static .sub-link:hover{color:var(--cyan);text-decoration:underline}.map-topic td:nth-child(2)>.ch-badge-link{float:right}.course-map-table .grade{display:inline-flex;align-items:center;justify-content:center;width:27px;height:21px;border-radius:5px;font:700 11px "JetBrains Mono",monospace}.course-map-table .g7{background:rgba(34,211,238,.15);color:var(--cyan)}.course-map-table .g8{background:rgba(252,211,77,.15);color:var(--amber)}.course-map-table .g9{background:rgba(52,211,153,.15);color:var(--green)}.course-map-table .g10{background:rgba(167,139,250,.18);color:var(--violet)}.course-map-table .g11{background:rgba(248,113,113,.15);color:var(--red)}.course-map-table .num,.course-map-legend .num{display:inline-block;margin:1px 3px 1px 0;padding:1px 5px;border:1px solid var(--line);border-radius:4px;background:var(--bg2);font:10px "JetBrains Mono",monospace}.course-map-table .num.oge,.course-map-legend .num.oge{color:var(--amber)}.course-map-table .num.ege,.course-map-legend .num.ege{color:var(--cyan)}.course-map-table .dash{color:var(--muted)}.mobile-ch-info,.mobile-sub-info{display:none}.course-map-empty{padding:28px!important;color:var(--muted);text-align:center}.static-sub td{background:rgba(34,211,238,.015)}.course-map-footer{max-width:850px;margin:24px auto 0;color:var(--muted);font-size:11px;line-height:1.6;text-align:center}.theme-btn{position:fixed;top:14px;right:14px;z-index:999;display:flex;align-items:center;justify-content:center;width:36px;height:36px;border:1px solid var(--line);border-radius:50%;background:var(--panel);color:var(--muted);font-size:16px;cursor:pointer}
@media(max-width:760px){.course-map-tools{align-items:stretch}.course-map-search{min-width:100%}.course-map-chips{width:100%}.course-map-count{width:100%;margin-left:0;padding-bottom:0}.course-map-table-wrap{overflow:visible}.course-map-table{table-layout:auto}.course-map-table thead{display:none}.course-map-table td{padding:7px 6px}.course-map-table td:nth-child(3),.course-map-table td:nth-child(4),.course-map-table td:nth-child(5){display:none}.course-map-table td:nth-child(1){width:46px}.course-map-table .sectionhead td{display:table-cell;padding:9px 7px}.map-toggle{display:none}.course-map-table .ch-title{white-space:normal;font-size:12px;line-height:1.4}.course-map-table .ch-badge-link{margin-left:5px}.mobile-ch-info,.mobile-sub-info{display:flex;gap:7px;align-items:flex-start;flex-wrap:wrap;margin-top:6px}.mobile-ch-info .nums,.mobile-sub-info .nums{display:flex;flex-wrap:wrap;gap:1px}.map-topic td:nth-child(1){padding-left:8px}.map-topic .sub-link{font-size:12px}.course-map-legend{gap:10px}.static-sub td:nth-child(2){padding-left:10px}}
.course-map-footer a{color:var(--cyan)}