:root{--bg-main: #f0f4f0;--bg-card: #ffffff;--bg-light: #f8faf8;--bg-hover: #e8f5eb;--text-primary: #1e3a29;--text-secondary: #4a6352;--text-muted: #6b8f7a;--accent: #4a7c59;--accent-dark: #3d6b4a;--accent-secondary: #6b8f7a;--highlight: #e8b931;--border: #d4e5d8;--border-light: #e8f0ea;--tree-branch: #4a7c59;--tree-node: #6b8f7a;--theta-label: #8e44ad;--shadow-card: 0 4px 20px rgba(30, 58, 41, .1);--shadow-btn: 0 2px 8px rgba(30, 58, 41, .15)}*{box-sizing:border-box;margin:0;padding:0}body{font-family:Nunito Sans,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;color:var(--text-primary);background:var(--bg-main);min-height:100vh}.monospace{font-family:Source Code Pro,monospace}.header{display:flex;align-items:center;justify-content:space-between;padding:16px 24px;background:var(--bg-main);border-bottom:1px solid var(--border)}.header-title{font-size:1.4em;font-weight:700;color:var(--text-primary)}.header-controls{display:flex;align-items:center;gap:16px}.view-select{padding:8px 12px;border:1px solid var(--border);border-radius:6px;background:var(--bg-card);color:var(--text-primary);font-family:inherit;font-size:.9em;cursor:pointer;transition:border-color .15s}.view-select:hover{border-color:var(--accent)}.view-select:focus{outline:none;border-color:var(--accent)}.theta-toggle{display:flex;align-items:center;gap:6px;font-size:.9em;color:var(--text-secondary);cursor:pointer}.theta-toggle input[type=checkbox]{width:16px;height:16px;accent-color:var(--accent)}.main-content{padding:24px;max-width:1200px;margin:0 auto}.card{background:var(--bg-card);border-radius:12px;box-shadow:var(--shadow-card);overflow:hidden}.file-bar{display:flex;align-items:center;gap:16px;padding:16px 20px;border-bottom:1px solid var(--border-light)}.btn{padding:10px 20px;border:none;border-radius:8px;font-family:inherit;font-size:.9em;font-weight:600;cursor:pointer;transition:all .15s}.btn-primary{background:linear-gradient(135deg,var(--accent) 0%,var(--accent-dark) 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Pro,monospace}.canvas-container{position:relative;width:100%;height:500px;background:var(--bg-card);overflow:auto}#tree-canvas{display:block}.dimension-controls{display:flex;align-items:center;gap:24px;padding:8px 20px;background:var(--bg-light);border-bottom:1px solid var(--border-light);font-size:.85em;color:var(--text-secondary)}.dimension-control{display:flex;align-items:center;gap:8px}.dimension-control label{white-space:nowrap}.dimension-slider{width:150px;height:4px;-webkit-appearance:none;-moz-appearance:none;appearance:none;background:var(--border);border-radius:2px;outline:none}.dimension-slider::-webkit-slider-thumb{-webkit-appearance:none;-moz-appearance:none;appearance:none;width:14px;height:14px;border-radius:50%;background:var(--accent);cursor:pointer}.dimension-slider::-moz-range-thumb{width:14px;height:14px;border:none;border-radius:50%;background:var(--accent);cursor:pointer}.dimension-value{font-family:Source Code Pro,monospace;min-width:55px}.no-tree-message{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);text-align:center;color:var(--text-muted)}.no-tree-message p{font-size:1.1em;margin-bottom:8px}.no-tree-message .hint{font-size:.9em;color:var(--text-secondary)}.no-tree-message.hidden{display:none}.navigation{display:flex;align-items:center;gap:12px;padding:16px 20px;border-top:1px solid var(--border-light)}.nav-btn{width:36px;height:36px;border:1px solid var(--border);border-radius:6px;background:var(--bg-card);color:var(--text-primary);font-size:.9em;cursor:pointer;transition:all 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