:root{--bg-primary:#000;--bg-secondary:#000;--bg-card:#0a0a0a;--bg-card-hover:#121212;--bg-glass:#ffffff08;--bg-glass-hover:#ffffff0f;--accent-1:#fff;--accent-2:#e4e4e7;--accent-3:#a1a1aa;--accent-gradient:linear-gradient(135deg, #fff 0%, #71717a 100%);--accent-glow:none;--text-primary:#fff;--text-secondary:#a1a1aa;--text-muted:#52525b;--border:#ffffff0f;--border-accent:#fff3;--success:#10b981;--warning:#f59e0b;--danger:#ef4444;--radius-sm:8px;--radius-md:12px;--radius-lg:16px;--radius-xl:24px;--shadow-sm:0 2px 8px #0000004d;--shadow-md:0 8px 32px #0006;--shadow-lg:0 20px 60px #00000080;--transition:.2s cubic-bezier(.4, 0, .2, 1);--transition-slow:.4s cubic-bezier(.4, 0, .2, 1);--font-sans:"Inter", -apple-system, BlinkMacSystemFont, sans-serif;--font-display:"Space Grotesk", sans-serif}*,:before,:after{box-sizing:border-box;margin:0;padding:0}html{-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;font-size:16px}body{font-family:var(--font-sans);background:var(--bg-primary);color:var(--text-primary);min-height:100vh;overflow-x:hidden}#root{min-height:100vh}::-webkit-scrollbar{width:6px;height:6px}::-webkit-scrollbar-track{background:0 0}::-webkit-scrollbar-thumb{background:#ffffff1f;border-radius:99px}::-webkit-scrollbar-thumb:hover{background:#fff3}.glass{background:var(--bg-glass);-webkit-backdrop-filter:blur(12px);border:1px solid var(--border)}.glass-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg)}.btn{border-radius:var(--radius-md);font-family:var(--font-sans);cursor:pointer;transition:all var(--transition);white-space:nowrap;-webkit-user-select:none;user-select:none;border:none;outline:none;align-items:center;gap:8px;padding:10px 20px;font-size:14px;font-weight:500;display:inline-flex}.btn:disabled{opacity:.5;cursor:not-allowed}.btn-primary{background:var(--accent-gradient);color:#000;font-weight:600}.btn-primary:hover:not(:disabled){background:#fff;transform:translateY(-1px)}.btn-primary:active:not(:disabled){transform:translateY(0)}.btn-ghost{background:var(--bg-glass);color:var(--text-secondary);border:1px solid var(--border)}.btn-ghost:hover:not(:disabled){background:var(--bg-glass-hover);color:var(--text-primary);border-color:var(--border-accent)}.btn-danger{color:var(--danger);background:#ef444426;border:1px solid #ef444440}.btn-danger:hover:not(:disabled){background:#ef444440}.input{border:1px solid var(--border);border-radius:var(--radius-md);width:100%;color:var(--text-primary);font-family:var(--font-sans);transition:border-color var(--transition), box-shadow var(--transition);background:#ffffff0a;outline:none;padding:12px 16px;font-size:14px}.input:focus{border-color:var(--accent-1);box-shadow:0 0 0 2px #ffffff1a}.input::placeholder{color:var(--text-muted)}.landing{flex-direction:column;justify-content:center;align-items:center;min-height:100vh;padding:40px 20px;display:flex;position:relative;overflow:hidden}.landing-bg{pointer-events:none;z-index:0;position:fixed;inset:0}.landing-bg:before{content:"";background:radial-gradient(#7c6aff1f 0%,#0000 70%);width:60%;height:60%;animation:8s ease-in-out infinite alternate floatBg;position:absolute;top:-30%;left:-20%}.landing-bg:after{content:"";background:radial-gradient(#4f86ff1a 0%,#0000 70%);width:50%;height:50%;animation:10s ease-in-out infinite alternate-reverse floatBg;position:absolute;bottom:-20%;right:-10%}@keyframes floatBg{0%{transform:translate(0)scale(1)}to{transform:translate(30px,-30px)scale(1.1)}}.landing-content{z-index:1;flex-direction:column;align-items:center;gap:40px;width:100%;max-width:520px;display:flex;position:relative}.logo{flex-direction:column;align-items:center;gap:12px;display:flex}.logo-icon{background:var(--accent-gradient);width:72px;height:72px;box-shadow:var(--accent-glow);border-radius:20px;justify-content:center;align-items:center;font-size:32px;animation:3s ease-in-out infinite logoFloat;display:flex}@keyframes logoFloat{0%,to{transform:translateY(0)}50%{transform:translateY(-6px)}}.logo-title{font-family:var(--font-display);background:var(--accent-gradient);-webkit-text-fill-color:transparent;letter-spacing:-1px;-webkit-background-clip:text;background-clip:text;font-size:36px;font-weight:700}.logo-sub{color:var(--text-muted);letter-spacing:.5px;font-size:14px}.upload-zone{border:2px dashed var(--border);border-radius:var(--radius-xl);cursor:pointer;width:100%;transition:all var(--transition);background:var(--bg-glass);-webkit-backdrop-filter:blur(8px);text-align:center;flex-direction:column;align-items:center;gap:16px;padding:48px 32px;display:flex}.upload-zone:hover,.upload-zone.drag-over{border-color:var(--accent-1);background:#ffffff08;transform:translateY(-2px)}.upload-zone.drag-over{border-style:solid;transform:scale(1.02)}.upload-icon{width:64px;height:64px;color:var(--accent-1);transition:transform var(--transition);background:#ffffff0f;border-radius:16px;justify-content:center;align-items:center;font-size:28px;display:flex}.upload-zone:hover .upload-icon{transform:translateY(-4px)}.upload-title{color:var(--text-primary);font-size:18px;font-weight:600}.upload-desc{color:var(--text-muted);font-size:13px;line-height:1.6}.upload-limit{color:var(--text-muted);border:1px solid var(--border);background:#ffffff0a;border-radius:99px;padding:4px 12px;font-size:12px}.divider{align-items:center;gap:16px;width:100%;display:flex}.divider:before,.divider:after{content:"";background:var(--border);flex:1;height:1px}.divider-text{color:var(--text-muted);white-space:nowrap;letter-spacing:.5px;font-size:12px}.join-form{gap:10px;width:100%;display:flex}.progress-bar{background:#ffffff0f;border-radius:99px;width:100%;height:4px;overflow:hidden}.progress-fill{background:var(--accent-gradient);border-radius:99px;height:100%;transition:width .3s;box-shadow:0 0 10px #7c6aff80}.workspace{background:var(--bg-primary);width:100vw;height:100vh;display:flex;position:relative;overflow:hidden}.sidebar{-webkit-backdrop-filter:blur(40px)saturate(160%);z-index:100;opacity:0;pointer-events:none;will-change:transform, opacity;background:#09090bbf;border:1px solid #ffffff12;border-radius:20px;flex-direction:column;width:248px;transition:transform .5s cubic-bezier(.16,1,.3,1),opacity .35s;display:flex;position:absolute;top:14px;bottom:14px;left:14px;overflow:hidden;transform:translate(-280px);box-shadow:inset 0 0 0 .5px #ffffff0a,0 40px 80px #000000b3,0 8px 32px #00000080}.sidebar.open{opacity:1;pointer-events:auto;transform:translate(0)}.sidebar ::-webkit-scrollbar{width:3px}.sidebar ::-webkit-scrollbar-track{background:0 0}.sidebar ::-webkit-scrollbar-thumb{background:#ffffff14;border-radius:99px}.sb-row{border-bottom:1px solid #ffffff0a;align-items:center;gap:10px;padding:10px 14px;transition:background .15s;display:flex}.sb-row:last-child{border-bottom:none}.sb-label{color:#ffffff4d;text-transform:uppercase;letter-spacing:.6px;white-space:nowrap;font-size:10px;font-weight:500}.sb-slider{appearance:none;cursor:pointer;background:#ffffff1a;border-radius:99px;outline:none;width:100%;height:3px;transition:background .15s}.sb-slider::-webkit-slider-thumb{-webkit-appearance:none;cursor:grab;background:#fff;border-radius:50%;width:14px;height:14px;transition:transform .15s;box-shadow:0 0 0 2px #0006,0 2px 6px #0000004d}.sb-slider::-webkit-slider-thumb:active{cursor:grabbing;transform:scale(1.2)}.sb-slider::-moz-range-thumb{cursor:grab;background:#fff;border:none;border-radius:50%;width:14px;height:14px;box-shadow:0 0 0 2px #0006}.sb-icon-btn{color:#ffffff4d;cursor:pointer;background:0 0;border:none;border-radius:6px;flex-shrink:0;justify-content:center;align-items:center;padding:4px;font-size:14px;transition:color .15s,background .15s;display:flex}.sb-icon-btn:hover{color:#fffc;background:#ffffff0f}.sb-user-dot{border-radius:50%;flex-shrink:0;width:6px;height:6px;box-shadow:0 0 6px}.sb-propose-btn{color:#ffffff80;width:100%;font-size:12px;font-weight:500;font-family:var(--font-sans);cursor:pointer;letter-spacing:.2px;background:#ffffff08;border:1px solid #ffffff14;border-radius:10px;justify-content:center;align-items:center;gap:6px;padding:9px 0;transition:background .2s,color .2s,border-color .2s,transform .15s;display:flex}.sb-propose-btn:hover{color:#fffc;background:#ffffff12;border-color:#ffffff24}.sb-propose-btn:active{transform:scale(.97)}.sb-code{color:#fff;letter-spacing:2px;font-family:SF Mono,Fira Code,monospace;font-size:13px;font-weight:600}.sidebar-header{border-bottom:1px solid var(--border);justify-content:space-between;align-items:center;gap:12px;padding:20px;display:flex}.sidebar-logo{font-family:var(--font-display);background:var(--accent-gradient);-webkit-text-fill-color:transparent;-webkit-background-clip:text;background-clip:text;font-size:18px;font-weight:700}.sidebar-pdf-name{color:var(--text-muted);text-overflow:ellipsis;white-space:nowrap;max-width:180px;font-size:12px;overflow:hidden}.sidebar-section{border-bottom:1px solid var(--border);padding:16px}.sidebar-section-title{color:var(--text-muted);text-transform:uppercase;letter-spacing:.8px;margin-bottom:12px;font-size:11px;font-weight:600}.tool-grid{grid-template-columns:repeat(4,1fr);gap:8px;display:grid}.tool-btn{aspect-ratio:1;border-radius:var(--radius-md);border:1px solid var(--border);background:var(--bg-glass);color:var(--text-secondary);cursor:pointer;transition:all var(--transition);font-size:10px;font-family:var(--font-sans);flex-direction:column;justify-content:center;align-items:center;gap:4px;display:flex}.tool-btn:hover{background:var(--bg-glass-hover);color:var(--text-primary);border-color:#ffffff26}.tool-btn.active{border-color:var(--accent-1);color:var(--text-primary);background:#ffffff14}.tool-icon{font-size:18px}.stroke-controls{flex-direction:column;gap:12px;display:flex}.stroke-row{justify-content:space-between;align-items:center;gap:12px;display:flex}.stroke-label{color:var(--text-secondary);min-width:40px;font-size:12px}.stroke-slider{appearance:none;cursor:pointer;background:#ffffff1a;border-radius:99px;outline:none;flex:1;height:4px}.stroke-slider::-webkit-slider-thumb{appearance:none;background:var(--accent-1);cursor:pointer;width:16px;height:16px;transition:transform var(--transition);border-radius:50%;box-shadow:0 0 8px #7c6aff80}.stroke-slider::-webkit-slider-thumb:hover{transform:scale(1.2)}.stroke-value{color:var(--text-muted);text-align:right;min-width:28px;font-size:12px}.color-palette{flex-wrap:wrap;gap:8px;display:flex}.color-swatch{cursor:pointer;width:28px;height:28px;transition:all var(--transition);border:2px solid #0000;border-radius:8px;position:relative}.color-swatch:hover{transform:scale(1.15)}.color-swatch.active{border-color:#fff;transform:scale(1.1);box-shadow:0 0 0 2px #ffffff4d}.color-input-wrap{cursor:pointer;border:2px solid var(--border);width:28px;height:28px;transition:border-color var(--transition);background:var(--bg-glass);border-radius:8px;justify-content:center;align-items:center;font-size:14px;display:flex;overflow:hidden}.color-input-wrap:hover{border-color:var(--accent-1)}.room-code{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-md);justify-content:space-between;align-items:center;gap:8px;padding:12px;display:flex}.room-code-text{color:var(--accent-2);letter-spacing:2px;font-family:Space Grotesk,monospace;font-size:16px;font-weight:600}.copy-btn{color:var(--text-muted);cursor:pointer;border-radius:var(--radius-sm);transition:all var(--transition);background:0 0;border:none;align-items:center;padding:4px;font-size:16px;display:flex}.copy-btn:hover{color:var(--text-primary);background:var(--bg-glass)}.copy-btn.copied{color:var(--success)}.share-link-btn{justify-content:center;width:100%;margin-top:8px;padding:8px 16px;font-size:13px}.users-list{flex-direction:column;flex:1;gap:8px;padding:16px;display:flex;overflow-y:auto}.user-item{border-radius:var(--radius-md);background:var(--bg-glass);border:1px solid var(--border);transition:all var(--transition);align-items:center;gap:10px;padding:8px 10px;animation:.2s slideIn;display:flex}@keyframes slideIn{0%{opacity:0;transform:translate(-8px)}to{opacity:1;transform:translate(0)}}.user-avatar{color:#fff;border-radius:8px;flex-shrink:0;justify-content:center;align-items:center;width:28px;height:28px;font-size:12px;font-weight:700;display:flex}.user-name{color:var(--text-primary);text-overflow:ellipsis;white-space:nowrap;flex:1;font-size:13px;overflow:hidden}.user-badge{color:var(--text-muted);background:var(--bg-card);border-radius:99px;padding:2px 6px;font-size:10px}.user-online-dot{background:var(--success);border-radius:50%;width:7px;height:7px;animation:2s infinite pulse;box-shadow:0 0 6px #10b98199}@keyframes pulse{0%,to{opacity:1}50%{opacity:.5}}.sidebar-actions{border-top:1px solid var(--border);flex-direction:column;gap:8px;padding:16px;display:flex}.pdf-area{flex-direction:column;flex:1;display:flex;position:relative;overflow:hidden}.top-bar{background:var(--bg-secondary);border-bottom:1px solid var(--border);z-index:5;flex-shrink:0;justify-content:center;align-items:center;gap:12px;height:56px;padding:0 20px;display:flex;position:relative}.page-controls{align-items:center;gap:12px;display:flex}.page-btn{border-radius:var(--radius-sm);border:1px solid var(--border);background:var(--bg-glass);width:32px;height:32px;color:var(--text-secondary);cursor:pointer;transition:all var(--transition);justify-content:center;align-items:center;font-size:16px;display:flex}.page-btn:hover:not(:disabled){background:var(--bg-glass-hover);color:var(--text-primary);border-color:var(--border-accent)}.page-btn:disabled{opacity:.3;cursor:not-allowed}.page-info{color:var(--text-secondary);text-align:center;min-width:80px;font-size:13px}.zoom-controls{align-items:center;gap:8px;display:flex;position:absolute;right:20px}.zoom-badge{color:var(--text-muted);text-align:center;min-width:40px;font-size:12px}.pdf-scroll{background:#0e0f14;flex:1;justify-content:center;align-items:flex-start;padding:32px;display:flex;position:relative;overflow:auto}.canvas-container{border-radius:var(--radius-md);cursor:crosshair;transform-origin:0 0;background:#fff;display:inline-block;position:relative;overflow:hidden;box-shadow:0 20px 80px #0009,0 0 0 1px #ffffff0f}#pdf-canvas{z-index:1;display:block;position:relative}#static-canvas{z-index:2;pointer-events:none;display:block;position:absolute;top:0;left:0}#draw-canvas{z-index:3;touch-action:none;position:absolute;top:0;left:0}#cursor-canvas{z-index:3;pointer-events:none;position:absolute;top:0;left:0}.spinner{border:3px solid #7c6aff33;border-top-color:var(--accent-1);border-radius:50%;width:48px;height:48px;animation:.8s linear infinite spin}@keyframes spin{to{transform:rotate(360deg)}}.loading-overlay{z-index:20;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);background:#0a0b0fd9;flex-direction:column;justify-content:center;align-items:center;gap:16px;display:flex;position:absolute;inset:0}.loading-text{color:var(--text-secondary);font-size:14px}.remote-cursor-label{color:#fff;pointer-events:none;white-space:nowrap;z-index:100;border-radius:99px;padding:2px 8px;font-size:11px;font-weight:600;transition:top 50ms linear,left 50ms linear;position:absolute;transform:translate(14px,14px)}.toast{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-md);color:var(--text-primary);z-index:9999;box-shadow:var(--shadow-lg);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);align-items:center;gap:8px;padding:12px 20px;font-size:13px;animation:.3s toastIn,.3s 2.5s forwards toastOut;display:flex;position:fixed;bottom:24px;left:50%;transform:translate(-50%)translateY(0)}@keyframes toastIn{0%{opacity:0;transform:translate(-50%)translateY(20px)}to{opacity:1;transform:translate(-50%)translateY(0)}}@keyframes toastOut{0%{opacity:1;transform:translate(-50%)translateY(0)}to{opacity:0;transform:translate(-50%)translateY(20px)}}.toast-success{border-color:#10b98166}.toast-error{border-color:#ef444466}.modal-overlay{-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);z-index:1000;background:#000000b3;justify-content:center;align-items:center;padding:20px;display:flex;position:fixed;inset:0}.modal{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-xl);width:100%;max-width:420px;box-shadow:var(--shadow-lg);padding:40px;animation:.3s cubic-bezier(.34,1.56,.64,1) modalIn}@keyframes modalIn{0%{opacity:0;transform:scale(.9)translateY(20px)}to{opacity:1;transform:scale(1)translateY(0)}}.modal-title{font-family:var(--font-display);margin-bottom:8px;font-size:24px;font-weight:700}.modal-desc{color:var(--text-secondary);margin-bottom:28px;font-size:14px;line-height:1.6}.modal-label{color:var(--text-secondary);margin-bottom:8px;font-size:12px;font-weight:500;display:block}@media (width<=768px){.sidebar{width:calc(100vw - 16px);height:calc(100vh - 16px);top:8px;bottom:8px;left:8px;transform:translate(-110%)}.sidebar.open{transform:translate(0)}.pdf-scroll{padding:16px}}