:root{--blue:#2563eb;--blue-soft:#eaf2ff;--ink:#172033;--muted:#64748b;--line:#dbe3ef;--surface:#fff;--bg:#f3f6fa;--na:#3b82f6;--cl:#22a06b;--shadow:0 8px 28px rgba(31,50,81,.09)}
*{box-sizing:border-box}html,body{height:100%;margin:0}body{font-family:"Microsoft YaHei UI","PingFang SC",system-ui,sans-serif;background:var(--bg);color:var(--ink);overflow:hidden}button,input{font:inherit}button{cursor:pointer;border:0}
.topbar{height:76px;padding:12px 22px;display:flex;align-items:center;justify-content:space-between;background:#fff;border-bottom:1px solid var(--line)}.topbar h1{font-size:22px;margin:0 0 4px;font-weight:750;letter-spacing:.02em}.topbar p{font-size:13px;margin:0;color:var(--muted)}
.outline-btn{padding:9px 14px;background:#fff;color:var(--blue);border:1px solid #a9c5fa;border-radius:9px}.outline-btn:hover{background:var(--blue-soft)}
.layout{height:calc(100vh - 76px);display:grid;grid-template-columns:300px minmax(460px,1fr) 300px;gap:12px;padding:12px}.panel{background:var(--surface);border:1px solid var(--line);border-radius:14px;box-shadow:var(--shadow);overflow:auto}.panel-title{position:sticky;top:0;z-index:3;background:#fff;display:flex;align-items:center;justify-content:space-between;padding:15px 17px;border-bottom:1px solid var(--line);font-weight:750;color:#193765}.icon-btn{display:none;background:none;color:var(--muted);font-size:24px}.panel section{padding:13px 16px;border-bottom:1px solid #edf1f6}.panel h2{font-size:14px;margin:0 0 11px;color:#334155}
.switch-grid{display:grid;gap:9px}.switch-row{display:flex;align-items:center;justify-content:space-between;font-size:13px}.switch-row input{display:none}.switch-row i{width:36px;height:20px;border-radius:12px;background:#cbd5e1;position:relative;transition:.2s}.switch-row i:after{content:"";position:absolute;width:16px;height:16px;left:2px;top:2px;border-radius:50%;background:#fff;box-shadow:0 1px 3px #718096;transition:.2s}.switch-row input:checked+i{background:var(--blue)}.switch-row input:checked+i:after{transform:translateX(16px)}
.segmented{display:grid;grid-template-columns:repeat(3,1fr);border:1px solid #cbd8ea;border-radius:8px;overflow:hidden}.segmented button{font-size:12px;padding:8px 3px;background:#fff;color:#475569;border-right:1px solid #dbe3ef}.segmented button:last-child{border:0}.segmented button.active{color:#fff;background:var(--blue)}
.range-row{display:block;font-size:12px;margin:0 0 10px}.range-row span{display:flex;justify-content:space-between;margin-bottom:4px;color:#475569}.range-row output{color:var(--blue);font-variant-numeric:tabular-nums}.range-row input,.speed input{width:100%;accent-color:var(--blue)}.color-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:5px;margin:12px 0}.color-grid label{text-align:center;font-size:11px;color:#64748b}.color-grid input{display:block;width:100%;height:29px;border:0;padding:1px;background:none}.wide{width:100%}.soft-btn{background:#eef4ff;color:#2457a8;padding:9px;border-radius:8px}
.viewer{min-width:0;display:grid;grid-template-rows:minmax(280px,1fr) auto auto auto;gap:8px}.viewer>div:not(#canvasWrap){background:#fff;border:1px solid var(--line);border-radius:10px;box-shadow:0 3px 12px rgba(31,50,81,.05)}#canvasWrap{position:relative;min-height:280px;background:radial-gradient(circle at center,#fff 0,#f1f5fa 72%,#e8eef5 100%);border:1px solid var(--line);border-radius:14px;overflow:hidden;box-shadow:var(--shadow)}#sceneCanvas{width:100%;height:100%;display:block;touch-action:none}
.legend{position:absolute;left:14px;top:14px;background:rgba(255,255,255,.91);backdrop-filter:blur(5px);border:1px solid #dce4ef;border-radius:9px;padding:8px 10px;display:grid;gap:6px;font-size:12px}.legend span{display:flex;align-items:center;gap:7px}.dot{width:12px;height:12px;border-radius:50%;display:inline-block;box-shadow:inset -2px -2px 3px rgba(0,0,0,.15)}.na-dot{background:var(--na)}.cl-dot{background:var(--cl)}.view-hint{position:absolute;bottom:10px;left:50%;transform:translateX(-50%);white-space:nowrap;background:rgba(26,38,58,.68);color:#fff;padding:5px 10px;border-radius:12px;font-size:11px;pointer-events:none}.loading{position:absolute;inset:0;display:grid;place-items:center;background:#f6f8fb;color:#496079;font-size:14px;z-index:5}.loading.hidden{display:none}
.view-toolbar,.demo-actions,.teaching-bar{display:flex;align-items:center;justify-content:center;gap:6px;padding:8px;flex-wrap:wrap}.view-toolbar button,.teaching-bar button{background:#f4f7fb;color:#334155;border:1px solid #dce5f0;border-radius:7px;padding:7px 10px;font-size:12px}.view-toolbar button:hover,.teaching-bar button:hover{border-color:#9cb9e8;color:var(--blue)}.auto-rotate,.speed{font-size:12px;color:#475569;display:flex;align-items:center;gap:4px}.auto-rotate input{accent-color:var(--blue)}.speed input{width:70px}.primary-btn,.accent-btn,.danger-soft{padding:9px 14px;border-radius:8px;font-size:13px}.primary-btn{background:var(--blue);color:#fff}.primary-btn:hover{background:#1d4ed8}.danger-soft{background:#fff0f0;color:#c33}.accent-btn{background:#0e7490!important;color:#fff!important}.teaching-bar strong{font-size:12px;color:#2457a8;margin-left:3px}.hidden{display:none!important}
.knowledge{padding-bottom:16px}.knowledge .dynamic-message{margin:13px 14px 0;padding:12px;background:#edf6ff;border-left:4px solid var(--blue);border-radius:6px;font-size:13px;line-height:1.65;color:#1e3a5f}.facts{margin:0;padding:8px 16px}.facts>div{padding:8px 0;border-bottom:1px dashed #e5eaf1}.facts dt{font-size:11px;color:#718096;margin-bottom:3px}.facts dd{margin:0;font-size:13px;line-height:1.55}.teaching-tip{margin:4px 14px 13px;padding:12px;background:#fff7dc;border:1px solid #f1d982;border-radius:9px;color:#6f5200}.teaching-tip b{display:block;font-size:12px;margin-bottom:5px}.teaching-tip span{font-size:13px;font-weight:700;line-height:1.5}.selection-card{margin:0 14px;padding:12px!important;border:1px solid #dbe5f1!important;border-radius:10px;background:#f8fafc}.selection-card h2{color:#193765}.empty-state{font-size:12px;color:#8290a3;padding:6px 0}.ion-info{margin:0}.ion-info>div{display:flex;justify-content:space-between;font-size:12px;padding:5px 0}.ion-info dt{color:#64748b}.ion-info dd{margin:0;font-weight:650}.concept-note{margin:13px 14px 0;padding:11px;border-left:3px solid #8aa4c5;background:#f7f9fc;font-size:12px;color:#536274}.concept-note p{margin:5px 0 0;line-height:1.6}.toast{position:fixed;left:50%;bottom:22px;transform:translate(-50%,20px);opacity:0;background:#172033;color:#fff;padding:9px 16px;border-radius:8px;font-size:13px;transition:.25s;pointer-events:none;z-index:20}.toast.show{opacity:1;transform:translate(-50%,0)}
@media(max-width:1180px){.layout{grid-template-columns:260px minmax(420px,1fr) 260px}.topbar h1{font-size:19px}.panel section{padding-left:12px;padding-right:12px}}
@media(max-width:900px){body{overflow:auto}.topbar{height:auto;min-height:68px}.layout{height:auto;min-height:calc(100vh - 68px);grid-template-columns:220px minmax(430px,1fr);grid-template-rows:minmax(650px,calc(100vh - 92px)) auto}.knowledge{grid-column:1/-1}.viewer{grid-column:2}.controls{grid-row:1}.knowledge{display:grid;grid-template-columns:1fr 1fr}.knowledge .panel-title{grid-column:1/-1}.facts{grid-row:2/5}.teaching-tip,.selection-card,.concept-note{grid-column:2;margin-left:7px}}
@media(max-width:680px){.topbar{padding:10px 12px}.topbar h1{font-size:16px}.topbar p{font-size:11px}.outline-btn{font-size:12px;padding:7px}.layout{display:flex;flex-direction:column;padding:7px}.viewer{height:720px;order:1}.controls{order:2;max-height:none}.knowledge{order:3;display:block}.view-hint{font-size:9px}.demo-actions{gap:4px}.primary-btn{font-size:11px;padding:8px}.teaching-bar button{font-size:11px;padding:6px}.panel-title{position:static}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}
.structure-strip{height:66px;display:flex;align-items:center;gap:8px;padding:8px 20px;background:#f8fbff;border-bottom:1px solid var(--line)}.structure-strip>span{font-size:12px;color:#64748b;margin-right:4px}.structure-strip button{min-width:108px;padding:7px 12px;border:1px solid #d5dfec;border-radius:9px;background:#fff;color:#334155;display:flex;align-items:baseline;gap:7px}.structure-strip button.active{border-color:#76a5f5;background:#eaf2ff;color:#174da6;box-shadow:0 2px 8px rgba(37,99,235,.12)}.structure-strip button b{font-size:15px}.structure-strip button small{font-size:11px}.structure-strip em{margin-left:auto;font-style:normal;font-size:12px;color:#1e4f91;background:#fff;padding:7px 10px;border-radius:8px;border:1px solid #dbe6f4}.platform-layout{height:calc(100vh - 142px)}.platform-viewer{grid-template-rows:minmax(260px,1fr) auto auto auto}.projection-toolbar label{font-size:11px;color:#475569;display:flex;gap:3px;align-items:center}.projection-canvas{position:absolute;right:14px;bottom:38px;width:280px;height:200px;border:1px solid #cdd9e8;border-radius:9px;box-shadow:0 5px 18px rgba(30,50,80,.15);z-index:3}.direction-badge{position:absolute;right:14px;top:14px;background:rgba(255,255,255,.92);border:1px solid #dce4ef;border-radius:8px;padding:7px 9px;font-size:11px;color:#345}.select-row{display:flex;justify-content:space-between;align-items:center;font-size:12px;color:#475569;margin:0 0 9px}.select-row select{max-width:145px;padding:5px;border:1px solid #ccd8e8;border-radius:6px;background:#fff;color:#334155}.mini-note{font-size:11px;line-height:1.5;color:#718096;margin:7px 0 0}.range-row i{font-style:normal}.legend{max-width:190px}.color-grid{grid-template-columns:repeat(2,1fr)}
@media(max-width:900px){.platform-layout{height:auto}.structure-strip{overflow-x:auto}.structure-strip em{display:none}}
.tool-buttons{display:grid;grid-template-columns:1fr 1fr;gap:6px;margin-bottom:10px}.tool-buttons button{font-size:11px;padding:7px}
.unit-cell-card{margin:0 14px 13px;padding:12px!important;border:1px solid #cfe0f7!important;border-radius:10px;background:#f7fbff}.unit-cell-card h2{margin-bottom:8px!important;color:#193765}.calculation-rows{display:grid;gap:6px}.calculation-rows>div{display:grid;grid-template-columns:44px 1fr 28px;align-items:center;gap:6px;padding:6px 7px;border-radius:7px;background:#fff;border:1px solid #e2eaf4;font-size:11px}.calculation-rows span{font-weight:700;color:#334155}.calculation-rows b{font-weight:500;color:#64748b;text-align:center}.calculation-rows strong{text-align:right;color:#1d4ed8}.formula-result{display:flex;align-items:center;justify-content:space-between;margin-top:8px;padding:8px;border-radius:7px;background:#e8f1ff;font-size:11px;color:#475569}.formula-result strong{font-size:13px;color:#174da6}
.advanced-projection-panel{position:relative;background:#fff;border:1px solid var(--line);border-radius:10px;box-shadow:0 3px 12px rgba(31,50,81,.05);padding:8px 10px;display:grid;gap:7px}.projection-panel-title{display:flex;align-items:center;justify-content:space-between;gap:10px}.projection-panel-title b{font-size:12px;color:#193765}.projection-panel-title span{font-size:10px;color:#718096}.hkl-presets{display:flex;gap:4px;flex-wrap:wrap}.hkl-presets button,.projection-settings button,.projection-layer-tools button{padding:5px 8px;border:1px solid #d7e2ef;border-radius:6px;background:#f6f9fd;color:#334155;font-size:10px}.hkl-presets button:hover,.projection-settings button:hover,.projection-layer-tools button:hover{border-color:#76a5f5;color:#174da6;background:#eaf2ff}.projection-settings,.projection-layer-tools{display:flex;align-items:center;gap:9px;flex-wrap:wrap;font-size:10px;color:#475569}.projection-settings label,.projection-layer-tools label{display:flex;align-items:center;gap:4px}.projection-settings input[type=number]{width:38px;padding:4px;border:1px solid #ccd8e8;border-radius:5px}.projection-settings select,.projection-layer-tools select{padding:4px;border:1px solid #ccd8e8;border-radius:5px;background:#fff}.projection-layer-tools input[type=range]{width:90px}.projection-hit-list{position:absolute;right:10px;top:100%;z-index:8;width:280px;padding:8px;background:#fff;border:1px solid #cdd9e8;border-radius:8px;box-shadow:0 8px 24px rgba(30,50,80,.18);display:grid;gap:4px}.projection-hit-list b{font-size:11px;color:#193765}.projection-hit-list button{text-align:left;padding:6px;border-radius:5px;background:#f5f8fc;color:#475569;font-size:10px}.projection-canvas{cursor:crosshair}
@media(max-width:900px){.projection-panel-title span{display:none}.advanced-projection-panel{padding:7px}.projection-settings,.projection-layer-tools{gap:5px}.projection-canvas{width:240px;height:180px}}
.library-picker{display:flex;align-items:center;gap:8px;font-size:12px;color:#64748b}.library-picker select{min-width:230px;padding:9px 34px 9px 11px;border:1px solid #b9cbe3;border-radius:9px;background:#fff;color:#17345f;font-weight:700}.compare-shortcuts{display:flex;gap:6px}.compare-shortcuts button{min-width:auto!important;font-size:11px!important;padding:8px 10px!important}.special-action-grid{display:grid;grid-template-columns:1fr 1fr;gap:6px}.special-action-grid button{font-size:11px}.comparison-modal{position:fixed;inset:0;z-index:60;background:rgba(15,23,42,.62);display:grid;place-items:center;padding:24px}.comparison-shell{width:min(1180px,96vw);height:min(820px,92vh);overflow:auto;background:#f5f8fc;border-radius:16px;box-shadow:0 22px 70px rgba(0,0,0,.32);padding:14px}.comparison-shell>header{display:flex;justify-content:space-between;align-items:center;padding:4px 6px 13px}.comparison-shell h2{margin:0 0 3px;font-size:20px}.comparison-shell header p{margin:0;color:#64748b;font-size:12px}.comparison-shell header button{background:#fff;border:1px solid #cbd8e8;border-radius:8px;padding:8px 13px;color:#334155}.comparison-models{display:grid;grid-template-columns:1fr 1fr;gap:12px}.comparison-models article{background:#fff;border:1px solid #dbe4ef;border-radius:12px;overflow:hidden}.comparison-models h3{height:42px;margin:0;padding:11px 13px;font-size:13px;color:#193765;border-bottom:1px solid #e4eaf2}.comparison-models canvas{display:block;width:100%;height:430px;background:radial-gradient(circle,#fff,#eaf0f7)}.comparison-facts{margin-top:12px;background:#fff;border:1px solid #dbe4ef;border-radius:10px;overflow:hidden}.comparison-facts>div{display:grid;grid-template-columns:150px 1fr 1fr;border-bottom:1px solid #e7edf4}.comparison-facts>div:last-child{border:0}.comparison-facts b,.comparison-facts span{padding:8px 12px;font-size:12px}.comparison-facts b{background:#edf4ff;color:#244d84}.comparison-facts span{border-left:1px solid #e7edf4}.comparison-models article:first-child{box-shadow:inset 0 3px #2563eb}.comparison-models article:last-child{box-shadow:inset 0 3px #0e7490}
@media(max-width:900px){.compare-shortcuts{display:none}.library-picker select{min-width:190px}.comparison-models{grid-template-columns:1fr}.comparison-models canvas{height:320px}.comparison-shell{height:94vh}.comparison-facts>div{grid-template-columns:105px 1fr 1fr}}
/* 第二批结构：四模型课堂对比 */
.comparison-models.four{grid-template-columns:repeat(4,minmax(0,1fr))}
.comparison-models.four article{min-width:0}
.comparison-models.four canvas{height:270px}
.comparison-facts.many>div{grid-template-columns:140px repeat(4,minmax(0,1fr))}
.compare-shortcuts{flex-wrap:wrap}
#connectionLegend{margin:.35rem .75rem;padding:.45rem .65rem;border-radius:.55rem;background:#eff6ff;color:#315178}
@media(max-width:1100px){.comparison-models.four{grid-template-columns:repeat(2,minmax(0,1fr))}.comparison-facts.many{overflow-x:auto}.comparison-facts.many>div{min-width:760px}}