:root{--bg: #fbf7ee;--panel: #ffffff;--panel-border: #ebe6db;--text: #2a2c33;--muted: #5f6470;--accent: #5b8def;--accent-soft: #dfe9fb}*{box-sizing:border-box}body{margin:0;font-family:ui-sans-serif,system-ui,-apple-system,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;background:var(--bg);color:var(--text);-webkit-font-smoothing:antialiased}.app-shell{min-height:100vh;display:flex;flex-direction:column}.topbar{display:flex;align-items:center;justify-content:space-between;padding:16px 24px;border-bottom:1px solid var(--panel-border);background:linear-gradient(180deg,#fff,var(--bg))}.brand-block{display:flex;align-items:center;gap:14px}.brand-orb{width:48px;height:48px;border-radius:14px;background:linear-gradient(135deg,var(--accent-soft),var(--accent));display:grid;place-items:center;color:#fff}.topbar h1{margin:0;font-size:22px}.topbar p{margin:2px 0 0;color:var(--muted);font-size:13px}.top-nav{display:flex;align-items:center;gap:14px}.pack-switcher{display:inline-flex;align-items:center;gap:8px;background:var(--panel);border:1px solid var(--panel-border);padding:8px 12px;border-radius:10px;font-size:13px;color:var(--muted)}.pack-switcher select{border:0;background:transparent;font-size:14px;color:var(--text);cursor:pointer}.avatar-button{display:inline-flex;align-items:center;gap:6px;background:transparent;border:0;cursor:pointer}.avatar-core{width:30px;height:30px;border-radius:50%;display:grid;place-items:center}.avatar-core>span{width:14px;height:14px;border-radius:50%;background:var(--accent)}.app-grid{flex:1;display:grid;grid-template-columns:280px 1fr 320px;gap:16px;padding:16px 24px 24px}@media(max-width:1100px){.app-grid{grid-template-columns:240px 1fr}.right-rail{display:none}}.panel{background:var(--panel);border:1px solid var(--panel-border);border-radius:14px;padding:14px 16px}.panel+.panel{margin-top:14px}.panel-heading{display:flex;align-items:center;justify-content:space-between;font-weight:600;margin-bottom:10px;color:var(--muted);font-size:13px;text-transform:uppercase;letter-spacing:.04em}.panel-heading>span{display:inline-flex;align-items:center;gap:6px}.left-rail{display:flex;flex-direction:column;gap:14px}.specimen-list{display:flex;flex-direction:column;gap:6px}.specimen-row{display:grid;grid-template-columns:40px 1fr auto;align-items:center;gap:10px;padding:8px 10px;border-radius:10px;background:transparent;border:1px solid transparent;cursor:pointer;text-align:left;transition:background .12s,border-color .12s}.specimen-row:hover{background:#00000006}.specimen-row.is-active{background:var(--accent-soft);border-color:var(--accent)}.specimen-row .thumb{width:36px;height:36px;border-radius:12px;display:grid;place-items:center;border:1px solid var(--panel-border)}.specimen-row .thumb>span{width:16px;height:16px;border-radius:50%}.specimen-row .copy{display:flex;flex-direction:column;min-width:0}.specimen-row .copy strong{font-size:14px}.specimen-row .copy span{font-size:11.5px;color:var(--muted);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.specimen-row .fav{color:#0000002e;font-size:18px;cursor:pointer;-webkit-user-select:none;user-select:none}.specimen-row .fav.is-on{color:var(--accent)}.part-list{display:flex;flex-direction:column;gap:4px}.part-row{display:flex;align-items:center;gap:10px;padding:7px 10px;border-radius:8px;background:transparent;border:1px solid transparent;cursor:pointer;text-align:left;font-size:13.5px}.part-row:hover{background:#00000006}.part-row.is-active{background:var(--accent-soft);border-color:var(--accent)}.color-dot{width:12px;height:12px;border-radius:50%;display:inline-block}.stage-column{display:flex;flex-direction:column}.stage-panel{background:var(--panel);border:1px solid var(--panel-border);border-radius:14px;padding:18px;display:flex;flex-direction:column;gap:14px;flex:1}.stage-title{display:flex;justify-content:space-between;align-items:flex-start;gap:14px}.stage-title h2{margin:0;font-size:26px}.stage-title p{margin:4px 0 0;color:var(--muted);font-size:13.5px;font-style:italic}.view-card{display:inline-flex;align-items:center;gap:10px;padding:8px 12px;border-radius:12px;border:1px solid var(--panel-border);background:#fafafa;font-size:12px;color:var(--muted);text-transform:uppercase;letter-spacing:.04em}.mode-switcher{display:inline-flex;gap:4px}.mode-switcher button{border:0;background:#fff;border-radius:8px;padding:6px 8px;cursor:pointer;color:var(--muted)}.mode-switcher button.is-active{background:var(--accent);color:#fff}.toggle-line{display:inline-flex;align-items:center;gap:8px;text-transform:none;cursor:pointer;font-size:13px}.toggle-line input{display:none}.toggle-line i{width:30px;height:16px;border-radius:999px;background:#d8d4ca;position:relative;transition:background .16s}.toggle-line i:after{content:"";position:absolute;top:2px;left:2px;width:12px;height:12px;border-radius:50%;background:#fff;transition:transform .16s}.toggle-line input:checked+i{background:var(--accent)}.toggle-line input:checked+i:after{transform:translate(14px)}.canvas-wrap{flex:0 1 auto;min-height:380px;height:460px;border-radius:12px;border:1px solid var(--panel-border);overflow:hidden;background:var(--bg)}.specimen-canvas{width:100%;height:100%}.stage-toolbar{display:flex;gap:8px;flex-wrap:wrap}.stage-toolbar button{display:inline-flex;align-items:center;gap:6px;padding:8px 14px;border-radius:10px;border:1px solid var(--panel-border);background:#fff;cursor:pointer;font-size:13px;color:var(--muted)}.stage-toolbar button.is-active{background:var(--accent-soft);color:var(--text);border-color:var(--accent)}.model-loader{background:#ffffffeb;border:1px solid var(--panel-border);border-radius:12px;padding:16px 22px;text-align:center;min-width:220px}.model-loader span{display:block;font-size:12px;color:var(--muted)}.model-loader strong{font-size:16px;display:block;margin:6px 0}.model-loader i{display:block;height:4px;border-radius:999px;background:var(--panel-border);overflow:hidden;margin:6px 0 4px}.model-loader i b{display:block;height:100%;background:var(--accent);transition:width .18s}.model-loader em{font-size:11.5px;color:var(--muted);font-style:normal}.right-rail{display:flex;flex-direction:column;gap:14px}.detail-heading button{border:0;background:transparent;color:var(--muted);cursor:pointer}.detail-hero{display:flex;align-items:center;gap:12px;margin-bottom:12px}.part-orb{width:40px;height:40px;border-radius:12px}.detail-hero h3{margin:0;font-size:17px}.detail-hero p{margin:3px 0 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6px;overflow:hidden}.mastery-meter i b{display:block;height:100%;width:var(--progress);background:var(--accent);transition:width .22s}.mastery-meter small{font-size:11.5px;color:var(--muted)}.lesson-focus,.tutor-prompt{background:#fff;border-radius:10px;padding:10px 12px;border:1px solid var(--panel-border)}.lesson-focus>span,.tutor-prompt>span{display:inline-flex;align-items:center;gap:6px;font-size:12px;color:var(--muted);text-transform:uppercase;letter-spacing:.04em}.lesson-focus p,.tutor-prompt p{margin:6px 0 0;font-size:13.5px;line-height:1.5}.inline-link{background:transparent;border:0;padding:0;color:var(--accent);cursor:pointer;text-decoration:underline;font:inherit}.prompt-list{display:flex;flex-direction:column;gap:6px}.prompt-list button{text-align:left;background:#fff;border:1px solid var(--panel-border);border-radius:10px;padding:9px 12px;font-size:13px;color:var(--text);cursor:pointer;transition:background .12s,border-color .12s}.prompt-list button:hover{background:var(--accent-soft);border-color:var(--accent)}.toast{position:fixed;bottom:24px;left:50%;transform:translate(-50%);background:#000000d6;color:#fff;font-size:13px;padding:8px 14px;border-radius:10px;z-index:50}