:root{--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light;--bg-canvas:#f7f5f2;--surface:#fff;--surface-white:var(--surface);--surface-soft:var(--bg-canvas);--surface-hover:#f0edeb;--accent:#624269;--accent-hover:#503456;--accent-soft:#efe8f1;--text-primary:#29252b;--text-secondary:#706873;--border-subtle:#e4dfda;--border-control:#958995;--canvas-dot:#dfdad7;--success:#3f7057;--success-soft:#eaf2ec;--coral:#a94432;--coral-soft:#fbe8e0;--amber:#8d651b;--amber-soft:#fff1cf;--gold:#d6b258;--shadow-sm:0 1px 2px #29252b0a, 0 3px 10px #29252b08;--shadow-md:0 2px 6px #29252b0a, 0 12px 32px #29252b12;--shadow-lg:0 4px 12px #29252b0d, 0 24px 64px #29252b1f;--radius-control:10px;--radius-panel:16px;--font-ui:"Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif}*{box-sizing:border-box;margin:0;padding:0}html,body{background:var(--bg-canvas);max-width:100vw;min-height:100vh;color:var(--text-primary);font-family:var(--font-ui);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;font-size:14px;line-height:1.5;overflow-x:clip}button,input,select{font:inherit}button,summary,a,input,select{-webkit-tap-highlight-color:transparent}h1,h2,h3,h4,strong,b{font-weight:600}button{color:inherit}button,a{transition:background-color .18s,color .18s,border-color .18s,box-shadow .18s}button:disabled{cursor:default}button:focus-visible,summary:focus-visible,a:focus-visible,select:focus-visible{outline:2px solid var(--accent);outline-offset:3px}button:not(:disabled),summary,a{touch-action:manipulation}::selection{background:var(--accent-soft);color:var(--text-primary)}.skylab-app{min-height:100dvh}.skylab-topbar{z-index:500;background:var(--surface);border-bottom:1px solid var(--border-subtle);position:sticky;top:0}.skylab-topbar-inner{min-height:64px;padding:max(10px, env(safe-area-inset-top)) max(12px, env(safe-area-inset-right)) 10px max(12px, env(safe-area-inset-left));grid-template-columns:minmax(0,1fr) auto;align-items:center;gap:8px 12px;display:grid}.skylab-brand{letter-spacing:-.04em;white-space:nowrap;cursor:pointer;background:0 0;border:0;border-radius:12px;flex:none;justify-self:start;align-items:center;gap:9px;min-height:44px;padding:0;font-size:20px;font-weight:600;display:flex}.skylab-brand:hover:not(:disabled){color:var(--accent)}.skylab-brand-mark{background:#fff;border-radius:8px;flex:none;width:34px;height:34px;display:inline-block;position:relative;overflow:hidden}.skylab-brand-mark img{width:350%;max-width:none;height:auto;position:absolute;top:50%;left:50%;transform:translate(-50%,-50%)}.skylab-main{width:100%;padding:8px max(8px, env(safe-area-inset-right)) max(12px, env(safe-area-inset-bottom)) max(8px, env(safe-area-inset-left))}.skylab-active-topic{text-overflow:ellipsis;white-space:nowrap;max-width:240px;color:var(--text-secondary);font-size:13px;font-weight:500;overflow:hidden}.skylab-workspace-slot{flex:1;grid-area:2/1/auto/-1;align-items:center;gap:4px;width:100%;min-width:0;display:flex}.skylab-save-progress,.signup-card button,.library-topic-form button,.model-extend-button,.picker-workspace-done{border-radius:var(--radius-control);background:var(--accent);color:var(--surface);cursor:pointer;box-shadow:var(--shadow-sm);border:1px solid #0000;font-weight:600;transition:background .18s,box-shadow .18s,transform .18s}.skylab-save-progress{white-space:nowrap;flex:none;min-height:44px;padding:0 12px;font-size:12px}.skylab-save-progress:hover:not(:disabled),.signup-card button:hover:not(:disabled),.library-topic-form button:hover:not(:disabled),.model-extend-button:hover:not(:disabled),.picker-workspace-done:hover:not(:disabled){background:var(--accent-hover)}.skylab-save-progress:active:not(:disabled),.signup-card button:active:not(:disabled),.library-topic-form button:active:not(:disabled),.model-extend-button:active:not(:disabled),.picker-workspace-done:active:not(:disabled){box-shadow:none;transform:translateY(1px)}.skylab-save-progress:disabled,.signup-card button:disabled,.library-topic-form button:disabled,.model-extend-button:disabled{background:var(--border-subtle);color:var(--text-secondary);border-color:var(--border-subtle);box-shadow:none;cursor:default}.skylab-progress-message{border:1px solid var(--border-subtle);background:var(--surface);border-radius:12px;max-width:1200px;margin:8px auto;padding:12px 16px;font-size:13px}.skylab-progress-message button{border:1px solid var(--border-subtle);background:var(--surface-white);color:var(--accent);cursor:pointer;border-radius:8px;margin-top:8px;padding:8px 12px}.skylab-account{flex:none;position:relative}.skylab-account summary{cursor:pointer;align-items:center;gap:7px;min-height:44px;font-size:13px;font-weight:600;list-style:none;display:flex}.skylab-account summary::-webkit-details-marker{display:none}.skylab-avatar{border:1px solid var(--border-subtle);background:var(--surface-soft);width:34px;height:34px;color:var(--text-primary);border-radius:50%;place-items:center;font-weight:700;display:grid}.skylab-account-menu,.model-score-panel{z-index:1300;border:1px solid var(--border-subtle);background:var(--surface);color:var(--text-primary);box-shadow:var(--shadow-lg);border-radius:12px;position:absolute;top:calc(100% + 12px);right:0}.skylab-account-menu{width:145px;padding:7px}.skylab-account-menu button{text-align:left;cursor:pointer;background:0 0;border:0;border-radius:8px;width:100%;padding:10px;font-size:12px}.skylab-account-menu button:hover{background:var(--surface-hover)}.signup-page{min-height:100dvh;padding:max(16px, env(safe-area-inset-top)) max(16px, env(safe-area-inset-right)) max(16px, env(safe-area-inset-bottom)) max(16px, env(safe-area-inset-left));background:var(--bg-canvas);place-items:center;display:grid}.signup-card{border:1px solid var(--border-subtle);border-radius:var(--radius-panel);background:var(--surface);width:min(440px,100%);box-shadow:var(--shadow-md);padding:28px 22px}.signup-brand{color:var(--accent);align-items:center;gap:9px;margin-bottom:24px;font-size:24px;font-weight:700;text-decoration:none;display:inline-flex}.signup-card h1{letter-spacing:-.04em;margin-bottom:12px;font-size:30px;font-weight:600;line-height:1.2}.signup-card p{color:var(--text-secondary);font-size:14px;line-height:1.65}.signup-card form{flex-direction:column;gap:10px;margin-top:24px;display:flex}.signup-card label{margin-top:6px;font-size:13px;font-weight:600}.signup-card input{border:1px solid var(--border-control);border-radius:var(--radius-control);background:var(--surface-white);width:100%;color:var(--text-primary);padding:12px 14px;font-size:16px}.signup-card input:focus{outline:3px solid var(--accent-soft);border-color:var(--accent)}.signup-card button{margin-top:12px;padding:13px 20px;font-size:14px}.signup-card .signup-returning{margin-top:24px;font-size:13px}.signup-back{color:var(--accent);text-align:center;margin-top:18px;font-size:13px;line-height:1.6;display:block}.signup-phone-field{min-width:0}.signup-phone-row{align-items:stretch;gap:8px;display:flex}.signup-phone-row>input{flex:1;min-width:0}.signup-country-picker{flex:none;position:relative}.signup-card .signup-country-trigger{border:1px solid var(--border-control);border-radius:var(--radius-control);background:var(--surface-white);height:100%;color:var(--text-primary);box-shadow:none;white-space:nowrap;align-items:center;gap:8px;margin:0;padding:12px 10px;font-size:16px;display:flex}.signup-card .signup-country-trigger:hover:not(:disabled),.signup-card .signup-country-option:hover:not(:disabled){background:var(--surface-soft)}.signup-card .signup-country-trigger:focus-visible,.signup-card .signup-country-option:focus-visible{outline:3px solid var(--accent-soft);border-color:var(--accent)}.signup-country-menu{z-index:10;border:1px solid var(--border-control);border-radius:var(--radius-control);background:var(--surface-white);width:min(340px,100vw - 80px);box-shadow:var(--shadow-md);padding:10px;position:absolute;top:calc(100% + 6px);left:0}.signup-country-search-label{margin:0 0 8px;display:block}.signup-country-options{overscroll-behavior:contain;max-height:min(260px,40dvh);margin-top:8px;overflow-y:auto}.signup-card .signup-country-option{width:100%;color:var(--text-primary);box-shadow:none;text-align:left;background:0 0;border:1px solid #0000;border-radius:6px;align-items:center;gap:10px;margin:0;padding:10px 8px;font-size:14px;display:flex}.signup-country-option>span:nth-child(2){flex:1}.signup-card .signup-country-option[aria-pressed=true]{background:var(--accent-soft)}.signup-card .signup-country-empty{padding:10px 8px}.signup-card .signup-phone-hint{margin-top:6px;font-size:12px}.model-studio{position:relative}.model-topic-row{background:var(--surface);border-bottom:1px solid var(--border-subtle);flex:none;align-items:center;gap:10px;min-width:0;padding:6px 14px;display:flex}.model-topic-row h1{text-overflow:ellipsis;white-space:nowrap;letter-spacing:-.03em;min-width:0;font-size:15px;line-height:1.3;overflow:hidden}.model-home-button{border:1px solid var(--border-subtle);border-radius:var(--radius-control);background:var(--surface);width:44px;height:44px;color:var(--accent);cursor:pointer;flex:none;place-items:center;display:grid}.model-home-button:hover:not(:disabled){background:var(--accent-soft);border-color:var(--accent)}.model-home-button:disabled{opacity:.5;cursor:wait}.model-score-menu{position:static}.model-score-menu summary{cursor:pointer;list-style:none}.model-score-menu summary::-webkit-details-marker{display:none}.model-canvas-frame{border:1px solid var(--border-subtle);background:var(--surface-white);min-height:0;box-shadow:none;border-radius:12px;flex-direction:column;justify-content:flex-end;align-items:flex-end;height:100%;padding:0;display:flex;position:relative;overflow:hidden}.skylab-excalidraw-shell,.skylab-excalidraw-board{background:var(--surface-white);width:100%;min-width:0;height:100%;position:absolute;inset:0;overflow:hidden}.skylab-excalidraw-board .excalidraw{--color-primary:var(--accent);--color-primary-darker:var(--accent);--color-primary-light:var(--accent-soft)}.skylab-excalidraw-board .excalidraw .App-menu,.skylab-excalidraw-board .excalidraw .layer-ui__wrapper__top-right,.skylab-excalidraw-board .excalidraw .layer-ui__wrapper__footer,.skylab-excalidraw-board .excalidraw .sidebar,.skylab-excalidraw-board .excalidraw .context-menu,.skylab-excalidraw-board .excalidraw .selected-shape-actions,.skylab-excalidraw-board .excalidraw .HintViewer{display:none!important}.skylab-board-navigation{z-index:50;border:1px solid var(--border-subtle);background:var(--surface);border-radius:12px;gap:4px;padding:4px;display:flex;position:absolute;bottom:14px;left:14px}.picker-whiteboard .skylab-board-navigation{left:auto;right:14px}.skylab-board-navigation button{color:var(--text-primary);cursor:pointer;background:0 0;border:0;border-radius:8px;padding:8px 10px}.skylab-board-navigation button:hover{background:var(--accent-soft)}.board-loading{height:100%;color:var(--text-secondary);place-content:center;display:grid}.model-focus-timer{min-width:56px;max-width:150px;min-height:44px;color:var(--text-secondary);flex-wrap:wrap;flex:none;justify-content:center;align-items:center;gap:6px;font-size:13px;display:flex}.model-timer-error{color:var(--coral);flex-basis:100%}.model-focus-timer [role=timer]{color:var(--text-primary);font-variant-numeric:tabular-nums;font-size:14px;font-weight:600}.model-focus-timer[data-complete=true],.model-focus-timer[data-complete=true] [role=timer]{color:var(--success)}.model-progress-message{border:1px solid var(--amber);background:var(--amber-soft);color:var(--text-primary);text-align:center;box-shadow:var(--shadow-lg);border-radius:12px;padding:10px 14px;font-size:13px;font-weight:500}.model-canvas-hint{z-index:45;max-width:calc(100% - 40px);color:var(--text-secondary);pointer-events:none;font-size:11px;font-weight:500;display:none;position:absolute;bottom:96px;left:20px}.model-empty-board{z-index:45;text-align:center;pointer-events:none;flex-direction:column;gap:16px;width:min(320px,100% - 32px);display:flex;position:absolute;top:48%;left:50%;transform:translate(-50%,-50%)}.model-empty-board>span{color:var(--border-subtle);font-size:48px}.model-empty-board strong{color:var(--text-secondary);font-size:16px;font-weight:500}.model-empty-board button{border:1px solid var(--border-subtle);background:var(--surface);color:var(--accent);box-shadow:var(--shadow-sm);cursor:pointer;pointer-events:auto;border-radius:12px;align-self:center;padding:12px 16px;font-size:13px;font-weight:600}.component-transformation{border-left:2px solid var(--border-subtle);background:var(--surface);border-radius:8px;gap:10px;min-width:0;padding:16px;font-size:14px;display:grid}.component-transformation>div>b{color:var(--text-secondary);margin-bottom:6px;font-size:12px;display:block}.library-create-spinner{border:3px solid var(--accent-soft);border-top-color:var(--accent);border-radius:50%;flex:none;width:30px;height:30px;animation:.9s linear infinite model-layer-spin}@keyframes model-layer-spin{to{transform:rotate(360deg)}}.model-game-dock{z-index:600;left:50%;bottom:max(16px, env(safe-area-inset-bottom));width:max-content;max-width:calc(100% - 32px - env(safe-area-inset-left) - env(safe-area-inset-right));flex-direction:column-reverse;align-items:center;gap:8px;display:flex;position:fixed;transform:translate(-50%)}.model-bottom-controls{border:1px solid var(--border-subtle);border-radius:var(--radius-panel);background:var(--surface);max-width:100%;box-shadow:var(--shadow-md);padding:8px}.model-bottom-actions{flex-wrap:wrap;justify-content:center;align-items:center;gap:8px;display:flex}.model-extend-button{white-space:nowrap;min-height:44px;padding:0 14px;font-size:12px}.model-picker-button{border-radius:var(--radius-control);background:var(--accent);min-height:44px;color:var(--surface);cursor:pointer;box-shadow:var(--shadow-sm);white-space:nowrap;border:1px solid #0000;align-items:center;gap:8px;padding:0 12px;font-size:12px;font-weight:600;transition:background .18s,box-shadow .18s,transform .18s;display:inline-flex}.model-picker-button:hover{background:var(--accent-hover)}.model-picker-button:active{box-shadow:none;transform:translateY(1px)}.model-picker-button span{font-size:20px}.model-picker-button small{color:var(--surface);background:#ffffff26;border-radius:99px;margin-left:4px;padding:2px 6px;font-size:11px}.model-score{border:1px solid var(--accent);border-radius:var(--radius-control);background:var(--accent-soft);min-height:44px;color:var(--accent);white-space:nowrap;cursor:pointer;align-items:center;gap:8px;padding:6px 12px;font-size:12px;font-weight:600;list-style:none;display:inline-flex}.model-score::-webkit-details-marker{display:none}.model-score:hover,.model-score-menu[open] .model-score{box-shadow:inset 0 0 0 1px}.model-score-count{font-variant-numeric:tabular-nums;font-size:16px;font-weight:700}.model-score-label{white-space:normal;max-width:90px;line-height:1.25}.model-score-check{font-size:18px}.model-score.is-complete{color:var(--success);background:var(--success-soft);border-color:var(--success)}.model-score-panel{width:min(300px,100vw - 32px);max-height:min(360px,100dvh - 160px);padding:20px;inset:auto auto calc(100% + 16px) 50%;overflow-y:auto;transform:translate(-50%)}.model-score-panel b{font-size:14px}.model-score-panel p,.model-score-panel li,.model-score-panel small{color:var(--text-secondary);font-size:13px;line-height:1.6}.model-score-panel p,.model-score-panel ul{margin-top:10px}.model-score-panel ul{padding-left:17px}.model-score-panel li+li{margin-top:10px}.model-score-panel small{margin-top:12px;display:block}.model-error{color:var(--coral);margin-top:12px;font-size:13px}.whiteboard-connection-feedback{z-index:400;pointer-events:none;position:absolute;inset:0}.whiteboard-connection-badge{border:1px solid var(--success);background:var(--success-soft);width:24px;height:24px;color:var(--success);box-shadow:var(--shadow-sm);border-radius:50%;place-items:center;font-size:16px;font-weight:700;display:grid;position:absolute;transform:translate(-50%,-50%)}.whiteboard-connection-badge[data-status=wrong]{border-color:var(--coral);background:var(--coral-soft);color:var(--coral)}.whiteboard-connection-badge[data-status=reversed]{border-color:var(--amber);background:var(--amber-soft);color:var(--amber)}.whiteboard-feedback-label{border:1px solid var(--success);background:var(--success-soft);max-width:min(540px,100% - 32px);color:var(--success);box-shadow:var(--shadow-sm);border-radius:12px;align-items:center;gap:8px;padding:12px 16px;font-size:13px;font-weight:600;line-height:1.5;animation:.2s ease-out feedback-enter;display:flex;position:absolute;top:128px;left:50%;transform:translate(-50%)}.whiteboard-feedback-label>span{font-size:21px}.whiteboard-feedback-label[data-status=wrong]{background:var(--coral-soft);border-color:var(--coral);color:var(--coral);animation:.25s ease-out feedback-shake}.whiteboard-feedback-label[data-status=reversed]{background:var(--amber-soft);border-color:var(--amber);color:var(--amber)}.whiteboard-feedback-label[data-status=complete]{background:var(--success-soft);border-color:var(--success);color:var(--success)}@keyframes feedback-enter{0%{opacity:0;translate:0 -6px}to{opacity:1;translate:0}}@keyframes feedback-shake{25%{translate:-4px}75%{translate:4px}}.model-celebration{position:absolute;top:140px;left:50%}.model-celebration i{background:var(--gold);width:9px;height:15px;animation:.9s ease-out both leaf-celebrate;animation-delay:calc(var(--leaf-index) * 20ms);border-radius:3px 10px;position:absolute}.model-celebration i:nth-child(3n){background:var(--amber)}.model-celebration i:nth-child(3n+1){background:var(--amber-soft)}@keyframes leaf-celebrate{0%{opacity:1;transform:translate(0)rotate(0)}to{opacity:0;transform:translate(var(--leaf-x), 160px) rotate(var(--leaf-turn))}}.picker-workspace-backdrop{z-index:9999;padding:max(8px, env(safe-area-inset-top)) max(8px, env(safe-area-inset-right)) max(8px, env(safe-area-inset-bottom)) max(8px, env(safe-area-inset-left));-webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px);background:#29252b38;position:fixed;inset:0}.picker-workspace .model-game-dock{position:absolute}.picker-workspace{border:1px solid var(--border-subtle);border-radius:var(--radius-panel);background:var(--surface);width:100%;height:100%;box-shadow:var(--shadow-lg);flex-direction:column;animation:.2s ease-out feedback-enter;display:flex;position:relative;overflow-y:auto}.picker-workspace-header{border-bottom:1px solid var(--border-subtle);background:var(--surface);flex-wrap:wrap;flex:none;justify-content:space-between;align-items:center;gap:8px;min-height:0;padding:12px;display:flex}.picker-workspace-title{align-items:center;gap:12px;width:100%;min-width:0;display:flex}.picker-workspace-icon{border:1px solid var(--border-subtle);background:var(--surface-soft);width:38px;height:38px;color:var(--text-secondary);border-radius:12px;flex:none;place-items:center;font-size:22px;display:grid}.picker-workspace-title small{color:var(--text-secondary);letter-spacing:.12em;font-size:10px;font-weight:600}.picker-workspace-title h2{text-overflow:ellipsis;white-space:nowrap;letter-spacing:-.03em;font-size:16px;overflow:hidden}.picker-workspace-actions{flex-wrap:wrap;flex:none;align-items:center;gap:8px;width:100%;display:flex}.picker-ready-status{max-width:190px;color:var(--text-secondary);text-align:right;font-size:11px;font-weight:500;display:none}.picker-workspace-progress{border:1px solid var(--border-subtle);background:var(--surface-soft);color:var(--text-secondary);border-radius:99px;padding:7px 10px;font-size:11px;font-weight:600;display:none}.picker-workspace-actions button{border:1px solid var(--border-subtle);background:var(--surface-white);cursor:pointer;border-radius:10px;min-height:44px;padding:0 10px;font-size:12px;font-weight:600}.picker-workspace-actions button:hover{background:var(--surface-hover)}.picker-workspace-actions .picker-workspace-done{background:var(--accent);color:var(--surface);border-color:var(--accent-hover);margin-left:auto}.picker-workspace-actions .picker-workspace-done:hover{background:var(--accent-hover)}.picker-workspace-context,.model-board-context{flex:none}.model-problem-setup{border-bottom:1px solid var(--border-subtle);background:var(--surface);overflow-wrap:anywhere;margin:0;padding:16px}.model-problem-eyebrow{color:var(--accent);letter-spacing:.14em;margin-bottom:8px;font-size:10px;font-weight:700;display:block}.model-problem-setup>h2{max-width:1000px;color:var(--text-primary);letter-spacing:-.025em;margin:0;font-size:clamp(18px,1.6vw,24px);font-weight:600;line-height:1.4}.model-approach{color:var(--text-secondary);flex-wrap:wrap;gap:4px 12px;margin:12px 0 0;font-size:13px;line-height:1.6;display:flex}.model-approach strong{color:var(--text-primary);font-weight:600}.model-reference{margin-top:8px}.model-reference>h3{color:var(--text-secondary);flex-wrap:wrap;align-items:center;gap:8px;margin:0 0 10px;font-size:12px;font-weight:600;display:flex}.model-reference>h3>span{opacity:.8;font-weight:400}.model-reference-content{border:1px solid var(--border-subtle);background:var(--surface-soft);border-radius:10px;padding:14px}.model-problem-setup dl{flex-wrap:wrap;gap:8px 24px;margin:0 0 12px;font-size:13px;line-height:1.6;display:flex}.model-problem-setup dl>div{gap:8px;display:flex}.model-problem-setup dt{color:var(--text-primary);font-weight:600}.model-problem-setup dd{color:var(--text-secondary);margin:0}.picker-meaning{flex-wrap:wrap;align-items:center;gap:8px 16px;display:flex}.picker-meaning-title{color:var(--text-secondary);flex:none;font-size:12px;font-weight:600}.picker-meaning-terms{flex-wrap:wrap;flex:1;align-items:center;gap:6px;display:flex}.picker-meaning-terms button{border:1px solid var(--border-subtle);background:var(--surface);color:var(--text-primary);cursor:pointer;border-radius:8px;min-height:44px;padding:7px 10px;font-size:13px;font-weight:500}.picker-meaning-terms button[aria-expanded=true]{background:var(--accent-soft);border-color:var(--accent)}.picker-meaning-definition{background:var(--accent-soft);border:1px solid var(--border-subtle);border-color:var(--border-subtle);border-left:2px solid var(--accent);color:var(--text-primary);border-radius:8px;flex-basis:100%;margin-top:4px;padding:16px;font-size:14px;line-height:1.65}.picker-meaning-status{color:var(--text-secondary);font-size:12px}.picker-workspace-body{flex:1 0 240px;min-height:240px;display:flex}.picker-whiteboard{background:var(--surface-white);flex:1;min-width:0;position:relative}.picker-whiteboard-hint{z-index:200;border:1px solid var(--border-subtle);background:var(--surface);max-width:calc(100% - 24px);color:var(--text-secondary);pointer-events:none;border-radius:10px;padding:9px 12px;font-size:12px;font-weight:600;position:absolute;bottom:96px;left:12px}.picker-canvas-controls{z-index:150;pointer-events:none;position:absolute;inset:0}.picker-canvas-add{background:radial-gradient(circle, var(--accent-soft) 13px, transparent 14px);width:44px;height:44px;color:var(--accent);pointer-events:auto;cursor:pointer;border:0;border-radius:50%;place-items:center;font-size:18px;font-weight:600;line-height:1;transition:transform .15s,background .15s,color .15s,box-shadow .15s;display:grid;position:absolute;transform:translate(-50%,-50%)}.picker-canvas-add:hover:not([aria-disabled=true]),.picker-canvas-add:focus-visible:not([aria-disabled=true]){background:radial-gradient(circle, var(--accent) 17px, transparent 18px);color:var(--surface);box-shadow:0 0 0 3px var(--accent-soft);transform:translate(-50%,-50%)scale(1.08)}.picker-canvas-add:focus-visible{outline:2px solid var(--accent);outline-offset:2px}.picker-canvas-add:active:not([aria-disabled=true]){transform:translate(-50%,-50%)scale(.98)}.picker-canvas-add.is-placed{background:radial-gradient(circle, var(--surface-hover) 17px, transparent 18px);color:var(--text-secondary);box-shadow:none;cursor:default;font-size:16px}.whiteboard-details-layer{z-index:700;pointer-events:none;position:fixed;inset:0}.picker-piece-details{z-index:800;border:1px solid var(--border-subtle);border-radius:var(--radius-panel);background:var(--surface);min-width:0;box-shadow:var(--shadow-lg);pointer-events:auto;overflow-wrap:anywhere;flex-direction:column;gap:10px;padding:14px;display:flex;position:absolute;overflow:hidden}.picker-piece-details[data-panel-scroll=true]{overscroll-behavior:contain;overflow-y:auto}.picker-piece-details[data-panel-scroll=true]>*{flex-shrink:0}.picker-piece-details-header{flex:none;align-items:center;gap:8px;display:flex}.picker-piece-details-header h3{letter-spacing:-.025em;flex:1;min-width:0;max-height:4.05em;font-size:16px;line-height:1.35;overflow-y:auto}.picker-piece-details[data-scrolls=true] .picker-piece-details-header h3{max-height:min(4.05em,16dvh);overflow-y:auto}.picker-piece-details-status{color:var(--text-secondary);flex:none;font-size:12px;font-weight:500}.picker-piece-details-close{background:var(--surface-soft);width:44px;height:44px;color:var(--text-secondary);cursor:pointer;border:0;border-radius:8px;flex:none;place-items:center;font-size:21px;display:grid}.picker-piece-details-body{overscroll-behavior:contain;flex:144px;min-width:0;height:144px;min-height:0;max-height:144px;font-size:13px;overflow-y:auto}.picker-piece-details[data-measuring=true] .picker-piece-details-body{flex:none}.picker-piece-details-footer{flex:none;gap:8px;display:grid}.picker-piece-details-footer p{color:var(--text-secondary);font-size:12px;line-height:1.5}.picker-piece-details-footer [role=alert]{color:var(--coral)}.picker-piece-deeper{border:1px solid var(--accent-hover);background:var(--accent);width:160px;max-width:100%;min-height:44px;color:var(--surface);cursor:pointer;border-radius:10px;justify-self:end;padding:8px 14px;font-size:13px;font-weight:600}.picker-piece-deeper:hover:not(:disabled){background:var(--accent-hover)}.picker-piece-deeper:disabled{background:var(--border-subtle);color:var(--text-secondary);border-color:var(--border-subtle);cursor:default}.picker-intel-block{background:var(--surface-soft);border-radius:10px;padding:12px}.picker-intel-block>b{color:var(--text-secondary);margin-bottom:4px;font-size:11px;display:block}.picker-intel-block p{font-size:13px;line-height:1.6}.picker-piece-purpose{overscroll-behavior:contain;flex:0 auto;min-height:48px;max-height:96px;overflow-y:auto}.picker-piece-tabs{border-bottom:1px solid var(--border-subtle);flex:none;grid-template-columns:1fr 1fr 1.5fr 1fr;gap:2px;display:grid}.picker-piece-tabs button{min-width:0;min-height:44px;color:var(--text-secondary);cursor:pointer;background:0 0;border:0;border-bottom:2px solid #0000;border-radius:6px 6px 0 0;padding:6px 2px;font-size:12px}.picker-piece-tabs button[aria-selected=true]{color:var(--accent);background:var(--accent-soft);border-bottom-color:var(--accent);font-weight:600}.picker-piece-tabs button:hover{background:var(--surface-hover)}.picker-piece-tabs button:focus-visible,.picker-piece-details-body:focus-visible,.picker-piece-purpose:focus-visible{outline:2px solid var(--accent);outline-offset:-2px}.picker-canvas-inspect{clip-path:inset(50%);white-space:nowrap;pointer-events:none;width:1px;height:1px;position:absolute;overflow:hidden}.picker-canvas-inspect:focus-visible{clip-path:none;white-space:normal;pointer-events:auto;border:1px solid var(--accent);background:var(--surface);width:auto;max-width:240px;height:auto;min-height:44px;color:var(--accent);border-radius:8px;padding:8px 12px}.model-parent-back{border:1px solid var(--border-subtle);background:var(--surface);min-height:44px;color:var(--text-secondary);cursor:pointer;border-radius:8px;padding:6px 10px;font-size:12px}.model-parent-back:hover:not(:disabled){background:var(--surface-hover)}.model-parent-back:disabled{opacity:.6;cursor:default}.picker-piece-details .example-content li+li{margin-top:4px}@media (pointer:coarse){.picker-piece-details-close{width:44px;height:44px}}.picker-workspace-backdrop.is-dragging .picker-workspace{opacity:0;pointer-events:none}.picker-workspace-backdrop.is-dragging:before{content:"DROP ON YOUR WHITEBOARD";border:1px solid var(--border-subtle);background:var(--surface);color:var(--accent);letter-spacing:.08em;pointer-events:none;border-radius:12px;padding:12px 16px;font-size:12px;font-weight:700;position:absolute;bottom:22px;left:22px}.example-content{overflow-wrap:anywhere;min-width:0;line-height:1.75}.example-content p{white-space:pre-line;margin:6px 0}.example-content ul,.example-content ol{margin:6px 0;padding-left:19px;list-style-position:outside}.example-content ul{list-style-type:disc}.example-content ol{list-style-type:decimal}.example-content li+li{margin-top:8px}.example-content strong{font-weight:600}.example-content code{background:var(--surface);border-radius:4px;padding:1px 4px;font:.95em/1.5 ui-monospace,monospace}.example-content pre{background:var(--surface);border-radius:8px;max-width:100%;margin:8px 0;padding:9px;overflow-x:auto}.example-content pre code{overflow-wrap:normal;background:0 0;padding:0}.picker-piece-details .example-content pre{white-space:pre-wrap;overflow-wrap:anywhere;overflow:visible}.picker-piece-details .example-content pre code{white-space:pre-wrap;overflow-wrap:anywhere}.example-content h1,.example-content h2,.example-content h3,.example-content h4,.example-content h5,.example-content h6{letter-spacing:normal;color:inherit;margin:8px 0 4px;font-size:1em;line-height:1.5}.example-content>:first-child{margin-top:4px}.example-content>:last-child{margin-bottom:0}.model-challenge-context{border:1px solid var(--border-subtle);border-radius:var(--radius-panel);background:var(--surface);flex-direction:column;justify-content:space-between;align-items:flex-start;gap:16px;margin-bottom:12px;padding:16px;display:flex}.model-challenge-context h2{margin:5px 0;font-size:18px}.model-challenge-context small,.model-challenge-context p,.model-challenge-context li{color:var(--text-secondary);font-size:12px;line-height:1.6}.model-challenge-context details{margin-top:9px;font-size:12px}.model-challenge-context summary{cursor:pointer;font-weight:600}.model-challenge-context ul{margin-top:6px;padding-left:20px}.model-challenge-context button,.model-challenge-dialog button{border:1px solid var(--border-subtle);background:var(--accent-soft);color:var(--accent-hover);cursor:pointer;border-radius:10px;min-height:44px;padding:10px 13px;font-size:12px;font-weight:600}.model-challenge-context button{flex:none}.model-challenge-dialog{border:1px solid var(--border-subtle);border-radius:var(--radius-panel);background:var(--surface);width:min(720px,100vw - 28px);max-height:calc(100dvh - 40px);color:var(--text-primary);box-shadow:var(--shadow-lg);margin:auto;padding:20px;position:fixed;inset:0;overflow-y:auto}.model-challenge-dialog::backdrop{-webkit-backdrop-filter:blur(5px);backdrop-filter:blur(5px);background:#29252b38}.model-challenge-dialog-header{justify-content:space-between;align-items:center;gap:12px;display:flex}.model-challenge-dialog h2{font-size:24px}.model-challenge-dialog p{color:var(--text-secondary);margin:12px 0;font-size:13px;line-height:1.6}.model-challenge-dialog [role=alert]{color:var(--coral)}.model-challenge-dialog button:disabled{opacity:.5;cursor:default}.model-challenge-options{gap:12px;margin:18px 0;display:grid}.model-challenge-options>button{border:1px solid var(--border-subtle);background:var(--surface-white);text-align:left;box-shadow:none;border-radius:12px;padding:20px;font-size:14px;line-height:1.5}.model-challenge-options>button:hover:not(:disabled){background:var(--accent-soft)}.whiteboard-library{width:min(1160px,100%);margin:0 auto;padding:34px 8px 40px}.library-create{text-align:center;max-width:760px;margin:0 auto 40px}.library-eyebrow{color:var(--text-secondary);letter-spacing:.14em;font-size:11px;font-weight:600}.library-create h1{letter-spacing:-.045em;text-wrap:balance;margin:20px 0 16px;font-size:clamp(30px,3.5vw,44px);font-weight:500;line-height:1.15}.library-create>p{color:var(--text-secondary);text-wrap:balance;max-width:330px;margin:0 auto;font-size:14px;line-height:1.7}.library-topic-form{background:var(--surface);border:1px solid var(--border-control);border-radius:var(--radius-panel);box-shadow:var(--shadow-sm);flex-wrap:wrap;align-items:center;gap:8px;margin:22px auto 0;padding:12px;display:flex}.library-topic-form:focus-within{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-soft), var(--shadow-sm)}.library-topic-label{clip-path:inset(50%);white-space:nowrap;width:1px;height:1px;margin:-1px;padding:0;position:absolute;overflow:hidden}.library-input-mark{color:var(--accent);flex:none;margin-left:4px;font-size:20px}.library-topic-form input{width:100%;min-width:0;height:44px;color:var(--text-primary);background:0 0;border:0;outline:0;flex:1;padding:0;font-size:16px}.library-topic-form input::placeholder{color:var(--text-secondary)}.library-topic-form button{flex:none;justify-content:center;align-items:center;gap:12px;width:100%;min-height:48px;margin-top:4px;margin-bottom:0;padding:0 20px;font-size:13px;display:flex}.library-create .library-error{margin-top:14px;font-size:12px}.library-create-status{border:1px solid var(--border-subtle);border-radius:var(--radius-panel);background:var(--surface);text-align:left;justify-content:center;align-items:center;gap:14px;margin-top:20px;padding:20px 24px;display:flex}.library-create-status-copy{flex-direction:column;gap:5px;min-width:0;display:flex}.library-create-status-copy strong{font-size:14px;font-weight:600;line-height:1.5}.library-create-status-copy span{color:var(--text-secondary);font-size:13px;line-height:1.5}.picker-piece-details-footer .library-create-status{margin-top:0}.library-error{line-height:1.6;color:var(--coral)!important}.library-section-heading{justify-content:space-between;align-items:flex-start;gap:16px;margin-bottom:24px;display:flex}.library-section-heading h2{letter-spacing:-.025em;font-size:18px;font-weight:600}.library-section-heading p{color:var(--text-secondary);margin-top:8px;font-size:13px}.library-count{color:var(--text-secondary);white-space:nowrap;background:var(--surface-hover);border:0;border-radius:99px;padding:7px 11px;font-size:12px}.library-grid{grid-template-columns:minmax(0,1fr);gap:18px;display:grid}.whiteboard-card{border:1px solid var(--border-subtle);border-radius:var(--radius-panel);background:var(--surface);min-width:0;color:var(--text-primary);text-align:left;cursor:pointer;box-shadow:var(--shadow-sm);padding:0;transition:transform .18s,box-shadow .18s,border-color .18s;display:block;position:relative;overflow:hidden}.whiteboard-card:hover:not(:disabled):not([aria-disabled=true]){border-color:var(--border-control);box-shadow:var(--shadow-md);transform:translateY(-2px)}.whiteboard-card:disabled,.whiteboard-card[aria-disabled=true]{opacity:.65;cursor:wait;pointer-events:none}.whiteboard-card:focus-visible{outline:2px solid var(--accent);outline-offset:2px}.whiteboard-card-thumbnail{aspect-ratio:16/10;background-color:var(--surface-white);background-image:radial-gradient(var(--canvas-dot) .65px, transparent .65px);background-size:20px 20px;justify-content:center;align-items:center;padding:24px;display:flex;position:relative;overflow:hidden}.whiteboard-card-canvas{pointer-events:none;position:absolute;inset:16px}.whiteboard-card-canvas img{object-fit:contain}.whiteboard-card-info{border-top:1px solid var(--border-subtle);background:var(--surface);flex-direction:column;gap:10px;padding:20px;display:flex}.whiteboard-card-info .whiteboard-card-topic{border-top:0;padding:0}.whiteboard-card-topic{border-top:1px solid var(--border-subtle);letter-spacing:-.015em;overflow-wrap:anywhere;max-width:100%;padding:14px 16px;font-size:15px;font-weight:600;line-height:1.5;display:block}.whiteboard-card-meta{flex-wrap:wrap;align-items:center;gap:8px;min-height:18px;display:flex}.whiteboard-card-timer{align-items:center;gap:5px;font-size:12px;line-height:1.3;display:inline-flex}.whiteboard-card-timer.completed{color:var(--success)}.whiteboard-card-timer.completed .whiteboard-card-timer-highlight{color:var(--success);font-variant-numeric:tabular-nums;font-weight:600}.whiteboard-card-timer.in-progress{color:var(--text-secondary)}.whiteboard-card-timer.in-progress .whiteboard-card-timer-highlight{color:var(--text-primary);font-variant-numeric:tabular-nums;font-weight:600}.whiteboard-card-timer-icon{stroke:currentColor;flex:none}.whiteboard-card-badge{letter-spacing:-.01em;-webkit-backdrop-filter:none;box-shadow:none;z-index:2;pointer-events:none;border-radius:99px;align-items:center;gap:6px;padding:4px 10px 4px 8px;font-size:11px;font-weight:500;display:inline-flex;position:absolute;top:12px;left:12px}.whiteboard-card-badge.completed{background:var(--success-soft);color:var(--success);border:1px solid #0000}.whiteboard-card-badge.in-progress{background:var(--surface);color:var(--text-secondary);border:1px solid var(--border-subtle)}.whiteboard-card-badge-dot{background:currentColor;border-radius:50%;width:6px;height:6px}.whiteboard-card-open{border:1px solid var(--border-subtle);width:30px;height:30px;color:var(--text-secondary);background:#ffffffe6;border-radius:8px;place-items:center;font-size:17px;display:grid;position:absolute;top:14px;right:14px}.whiteboard-card-actions{z-index:5;align-items:center;gap:8px;display:inline-flex;position:absolute;top:12px;right:12px}.whiteboard-card-actions .whiteboard-card-open{background:#fffffff2;border-radius:8px;width:32px;height:32px;font-size:16px;transition:transform .18s,background .18s,border-color .18s,color .18s;position:static}.whiteboard-card:hover .whiteboard-card-actions .whiteboard-card-open{border-color:var(--border-control);color:var(--text-primary);background:#fff}.whiteboard-card-share-btn{border:1px solid var(--border-subtle);-webkit-backdrop-filter:blur(8px);height:32px;color:var(--text-primary);cursor:pointer;white-space:nowrap;background:#fffffff2;border-radius:8px;align-items:center;gap:5px;padding:0 11px;font-size:12px;font-weight:500;transition:all .16s;display:inline-flex;box-shadow:0 1px 3px #29252b0d}.whiteboard-card-share-btn:hover:not(:disabled){border-color:var(--border-control);color:var(--accent);background:#fff;box-shadow:0 2px 8px #29252b14}.whiteboard-card-share-btn:active:not(:disabled){transform:scale(.97)}.whiteboard-card-share-btn.copied{background:var(--success-soft);color:var(--success);border-color:#3f70574d;font-weight:600}.whiteboard-card-share-btn:disabled{opacity:.6;cursor:default}.whiteboard-card-share-spinner{border:2px solid var(--border-control);border-top-color:var(--accent);border-radius:50%;width:12px;height:12px;animation:.8s linear infinite model-layer-spin;display:inline-block}.library-share-toast{z-index:1000;border:1px solid var(--border-subtle);border-radius:var(--radius-panel);background:var(--surface);width:calc(100% - 48px);max-width:420px;box-shadow:var(--shadow-lg);color:var(--text-primary);align-items:flex-start;gap:12px;padding:16px;animation:.2s feedback-enter;display:flex;position:fixed;bottom:24px;right:24px}.library-share-toast.error{border-color:var(--coral)}.library-share-toast-body{flex:1;min-width:0}.library-share-toast-title{color:var(--text-primary);margin:0 0 4px;font-size:13px;font-weight:600}.library-share-toast.error .library-share-toast-title{color:var(--coral)}.library-share-toast-desc{color:var(--text-secondary);margin:0 0 10px;font-size:12px;line-height:1.4}.library-share-toast-row{align-items:center;gap:8px;display:flex}.library-share-toast-row input{border:1px solid var(--border-subtle);background:var(--surface-soft);min-width:0;color:var(--text-primary);border-radius:6px;flex:1;padding:7px 10px;font-size:12px}.library-share-toast-row input:focus{outline:2px solid var(--accent);border-color:#0000}.library-share-toast-row button{border:1px solid var(--border-subtle);background:var(--surface);color:var(--accent);cursor:pointer;white-space:nowrap;border-radius:6px;padding:7px 12px;font-size:12px;font-weight:600}.library-share-toast-row button:hover{background:var(--surface-hover)}.library-share-toast-close{color:var(--text-secondary);cursor:pointer;background:0 0;border:none;border-radius:4px;flex:none;padding:0 4px;font-size:18px;line-height:1}.library-share-toast-close:hover{color:var(--text-primary);background:var(--surface-hover)}.picker-workspace-actions .picker-workspace-share{background:var(--surface-white);color:var(--text-primary);border-color:var(--border-control);align-items:center;gap:5px;transition:all .16s;display:inline-flex}.picker-workspace-actions .picker-workspace-share:hover:not(:disabled){background:var(--surface-hover);color:var(--accent);border-color:var(--accent)}.picker-workspace-actions .picker-workspace-share.copied{background:var(--success-soft);color:var(--success);border-color:#3f705766}.library-empty{border:1px solid var(--border-subtle);background:var(--surface);text-align:center;border-radius:20px;flex-direction:column;align-items:center;gap:12px;padding:64px 24px;display:flex}.library-empty-icon{background:var(--surface-soft);width:48px;height:48px;color:var(--accent);border-radius:12px;place-items:center;margin-bottom:4px;font-size:24px;display:grid}.library-empty h3{font-size:18px;font-weight:500}.library-empty p{color:var(--text-secondary);max-width:360px;font-size:14px;line-height:1.7}.library-empty button,.library-board-loading button{border:1px solid var(--border-subtle);background:var(--surface);color:var(--accent);cursor:pointer;border-radius:10px;min-height:44px;padding:10px 14px;font-size:12px;font-weight:600}.whiteboard-card-skeleton{aspect-ratio:16/12;border:1px solid var(--border-subtle);border-radius:var(--radius-panel);background:#ffffff8c}.library-auth-loading,.library-board-loading{color:var(--text-secondary);padding:30px;font-size:13px}.library-board-loading p{margin-top:18px}.skylab-workspace-slot:empty,.skylab-account-name,.skylab-active-topic{display:none}.picker-workspace-title>div,.library-section-heading>div{min-width:0}.skylab-app:has(.model-studio){flex-direction:column;height:100dvh;min-height:0;display:flex}.skylab-main:has(.model-studio){min-height:0;padding-top:max(8px, env(safe-area-inset-top));flex-direction:column;flex:1;display:flex}.model-studio{flex-direction:column;flex:1;min-height:0;display:flex;overflow-y:auto}.model-studio>.model-canvas-frame{flex:1 0 240px;height:auto;min-height:240px}.picker-piece-details[data-touch=true]{padding:max(16px, env(safe-area-inset-top)) max(16px, env(safe-area-inset-right)) max(16px, env(safe-area-inset-bottom)) max(16px, env(safe-area-inset-left))}.picker-piece-details[data-touch=true] .picker-piece-details-header h3{max-height:3.9em;overflow-y:auto}.picker-piece-details[data-touch=true] .picker-piece-details-status{display:none}.picker-piece-details[data-touch=true] .picker-piece-deeper{width:100%}.input-hint-touch{display:inline}.input-hint-mouse{display:none}@media (hover:hover) and (pointer:fine){.input-hint-touch{display:none}.input-hint-mouse{display:inline}}@media (min-width:621px){.skylab-topbar-inner{padding:max(12px, env(safe-area-inset-top)) max(16px, env(safe-area-inset-right)) 12px max(16px, env(safe-area-inset-left));gap:12px;display:flex}.skylab-brand{font-size:22px}.skylab-workspace-slot{gap:10px;width:auto}.skylab-account-name{display:inline}.skylab-save-progress{margin-left:auto;padding:0 16px;font-size:13px}.skylab-account{margin-left:auto}.skylab-main{padding:16px max(12px, env(safe-area-inset-right)) max(20px, env(safe-area-inset-bottom)) max(12px, env(safe-area-inset-left))}.model-canvas-frame{border-radius:var(--radius-panel)}.model-topic-row{padding:6px 24px}.model-bottom-controls{padding:10px 12px}.model-bottom-actions{gap:12px}.model-picker-button{padding:0 14px;font-size:13px}.model-challenge-context{flex-direction:row;padding:16px 20px}.model-challenge-dialog{padding:32px}.signup-card{padding:40px}.whiteboard-library{padding:48px 16px 56px}.library-create{margin-bottom:64px}.library-create>p{max-width:none;font-size:16px}.library-topic-form{flex-wrap:nowrap;gap:14px;margin-top:32px;padding:10px 10px 10px 20px}.library-topic-form input{height:48px}.library-topic-form button{width:auto;margin-top:0}.library-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:24px}.library-section-heading h2{font-size:20px}}@media (min-width:801px){.picker-workspace-header{flex-wrap:nowrap;gap:16px;padding:10px 24px}.picker-workspace-title{flex:1;width:auto}.picker-workspace-title h2{font-size:18px}.picker-workspace-actions{width:auto}.picker-workspace-progress{display:inline}.picker-workspace-actions button{padding:0 12px;font-size:13px}.model-problem-setup{padding:18px 24px 10px}}@media (min-width:961px){.skylab-active-topic{display:block}.whiteboard-library{padding:88px 32px 80px}.library-create{margin-bottom:80px}.library-grid{grid-template-columns:repeat(3,minmax(0,1fr))}}@media (min-width:1101px){.picker-ready-status{display:inline}}@media (max-width:1100px){.model-canvas-frame .skylab-board-navigation,.picker-whiteboard .skylab-board-navigation{top:14px;bottom:auto}}@media (max-height:500px){.picker-workspace-header{gap:4px;padding:8px 12px}.picker-workspace-title{flex:1;width:auto}.picker-workspace-title small,.picker-workspace-icon{display:none}.picker-workspace-actions{width:auto}.picker-whiteboard-hint{display:none}.model-bottom-controls{padding:6px 8px}.picker-piece-details[data-touch=true]{padding-top:12px;padding-bottom:max(12px, env(safe-area-inset-bottom));gap:8px}.picker-piece-details[data-touch=true] .picker-piece-details-header h3{max-height:2.7em}}@media (prefers-reduced-motion:reduce){*,:before,:after{scroll-behavior:auto!important;transition:none!important;animation:none!important}.model-celebration{display:none}.whiteboard-card:hover:not(:disabled){transform:none}}.whiteboard-connection-badge{animation:.22s ease-out connection-pop}@keyframes connection-pop{0%{opacity:.4;scale:.6}to{opacity:1;scale:1}}@media (prefers-reduced-motion:reduce){.whiteboard-connection-badge{animation:none}}.picker-workspace-error{background:var(--coral-soft);padding:10px 20px;font-size:12px}.whiteboard-save-error{z-index:500;border:1px solid var(--coral);background:var(--coral-soft);color:var(--coral);border-radius:8px;max-height:calc(100% - 180px);padding:12px;position:absolute;bottom:160px;left:12px;right:12px;overflow-y:auto}.whiteboard-save-error button{background:var(--surface);color:inherit;cursor:pointer;border:1px solid;border-radius:6px;min-height:44px;margin-left:8px;padding:4px 8px}