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(prefers-contrast:more){:root{--text-secondary:#c4c4c4;--text-tertiary:#ababab;--text-disabled:#7a7a7a;--border-subtle:1px solid #ffffff38;--border-default:1px solid #ffffff59;--border-accent:1px solid #fff9;--glass-bg:#0c0c0cf7}:focus-visible{outline-width:3px}.toolbar-btn.active,.rail-tool.active,.rail-segment button.active{outline:1px solid var(--text-primary)}}@media (forced-colors:active){.toolbar-btn.active,.topbar .toolbar-btn.active,.rail-btn.active,.rail-tool.active{forced-color-adjust:none;color:highlighttext;background:highlight}:focus-visible{outline:2px solid highlight}}.topbar{height:var(--toolbar-height);background:var(--glass-bg);-webkit-backdrop-filter:blur(var(--blur-chrome));backdrop-filter:blur(var(--blur-chrome));padding:0 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6px}.topbar-btn-primary{background:var(--accent-blue);color:#0a0a0a;border:none;font-weight:600}.topbar-btn-primary:hover{color:#0a0a0a;background:#fff}.topbar-btn-primary:not(:disabled):active{color:#0a0a0a;background:#d6d6db}.topbar-divider{background:#ffffff1a;width:1px;height:20px}.topbar-file{align-items:baseline;gap:var(--space-md);min-width:0;display:flex}.topbar-filename{font-family:var(--font-mono);font-size:var(--font-base);color:var(--text-primary);white-space:nowrap;text-overflow:ellipsis;max-width:320px;overflow:hidden}.topbar-dims{font-size:var(--font-xs);color:var(--text-tertiary);white-space:nowrap}.topbar-spacer{flex:1}.topbar{overflow:hidden}.topbar-btn,.topbar .toolbar-btn,.topbar .toolbar-group,.topbar-divider{flex-shrink:0}.topbar.tb-compact .tb-label{display:none}.topbar.tb-measuring .tb-label{display:inline!important}.topbar .toolbar-btn{border:var(--border-default);border-radius:var(--radius-sm);background:0 0}.topbar .toolbar-btn-text{height:32px;padding:0 12px}.topbar .toolbar-btn:hover{background:var(--bg-hover);color:var(--text-primary)}.topbar .toolbar-btn:not(:disabled):active{background:var(--bg-press)}.topbar .toolbar-btn.active{background:var(--accent-blue);color:#0a0a0a;border-color:#0000}.topbar .toolbar-btn.active:not(:disabled):active{background:#d6d6db}.topbar .toolbar-btn:disabled:hover{color:var(--text-secondary);background:0 0}.sidebar .btn-primary{background:var(--accent-blue);color:#0a0a0a;border-radius:var(--radius-sm);box-shadow:none}.sidebar .btn-primary:hover{color:#0a0a0a;box-shadow:none;background:#fff;transform:none}.sidebar .btn-primary:not(:disabled):active{box-shadow:none;background:#d6d6db}.app-main{position:relative}.left-rail{border-right:var(--border-subtle);width:56px;padding:var(--space-sm);transition:width var(--transition-smooth), flex-basis var(--transition-smooth);z-index:60;background:#0d0d0d;flex-direction:column;flex:0 0 56px;align-items:stretch;gap:2px;display:flex}.left-rail.expanded{flex-basis:200px;width:200px}.rail-btn{color:var(--text-tertiary);border-radius:var(--radius-md);cursor:pointer;transition:background var(--transition-fast), color var(--transition-fast);background:0 0;border:none;justify-content:center;align-items:center;gap:0;padding:9px;display:flex;position:relative}.left-rail.expanded .rail-btn{justify-content:flex-start;gap:12px;padding:9px 11px}.rail-btn:hover{color:var(--text-primary);background:#ffffff0a}.rail-btn:not(:disabled):active{background:var(--bg-press);color:var(--text-primary)}.rail-btn.active{color:var(--text-primary);box-shadow:inset 3px 0 0 var(--text-primary);background:#ffffff0a}.rail-label{font-size:var(--font-sm);letter-spacing:var(--tracking-sm);white-space:nowrap;font-weight:500;display:none}.left-rail.expanded .rail-label{display:inline}.rail-hamburger{color:var(--text-secondary)}.rail-divider{background:#ffffff0f;height:1px;margin:6px 6px 8px}.rail-flex{flex:1}.rail-pane{top:var(--space-md);bottom:var(--space-md);left:calc(56px + var(--space-md));width:288px;max-width:calc(100vw - 56px - 2 * var(--space-md));background:var(--glass-bg);-webkit-backdrop-filter:blur(var(--blur-panel));backdrop-filter:blur(var(--blur-panel));border:var(--border-default);border-radius:var(--radius-lg);box-shadow:var(--glass-shadow);z-index:55;transition:left var(--transition-smooth);animation:slideIn .2s var(--ease-out-soft) both;flex-direction:column;display:flex;position:absolute;overflow:hidden}.rail-pane.expanded{left:calc(200px + var(--space-md))}.rail-pane-header{border-bottom:var(--border-subtle);font-size:var(--font-sm);letter-spacing:.04em;text-transform:uppercase;color:var(--text-primary);justify-content:space-between;align-items:center;padding:14px 16px 10px;font-weight:600;display:flex}.rail-pane-close{color:var(--text-secondary);cursor:pointer;border-radius:var(--radius-sm);background:0 0;border:none;padding:6px;display:flex}.rail-pane-close:hover{color:var(--text-primary);background:var(--bg-hover)}.rail-pane-close:active{background:var(--bg-press)}.rail-pane-body{padding:var(--space-md);gap:var(--space-lg);flex-direction:column;flex:1;display:flex;overflow-y:auto}.rail-pane-body .sidebar-section{border:none;margin:0;padding:0}.rail-segment{background:var(--bg-tertiary);border:var(--border-default);border-radius:var(--radius-md);gap:4px;padding:3px;display:flex}.rail-segment button{border-radius:var(--radius-sm);color:var(--text-secondary);font-size:var(--font-sm);cursor:pointer;letter-spacing:var(--tracking-sm);transition:background var(--transition-fast), color var(--transition-fast);background:0 0;border:none;flex:1;padding:7px;font-weight:500}.rail-segment button:hover{color:var(--text-primary);background:#ffffff0a}.rail-segment button:active{background:var(--bg-press)}.rail-segment button.active{background:var(--accent-blue);color:#0a0a0a}.rail-segment button.active:active{background:#d6d6db}.rail-num{background:var(--bg-tertiary);width:60px;color:var(--text-primary);border:var(--border-default);border-radius:var(--radius-sm);padding:var(--space-xs) var(--space-sm);font-family:var(--font-mono);font-size:var(--font-sm)}.rail-tool-grid{grid-template-columns:repeat(4,1fr);gap:6px;display:grid}.rail-tool{aspect-ratio:1;border-radius:var(--radius-sm);cursor:pointer;border:var(--border-default);background:var(--bg-tertiary);color:var(--text-secondary);transition:background var(--transition-fast), color var(--transition-fast);justify-content:center;align-items:center;display:flex}.rail-tool:hover{color:var(--text-primary);background:var(--bg-hover)}.rail-tool:active{background:var(--bg-press)}.rail-tool.active{background:var(--accent-blue);color:#0a0a0a;border-color:var(--accent-blue)}.rail-tool.active:active{background:#d6d6db}