@import"https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600&display=swap";:root{--bg-primary: #ffffff;--bg-secondary: #f7f7f5;--bg-hover: #f1f1ef;--bg-active: #e8e8e6;--text-primary: #37352f;--text-secondary: #6b6b6b;--text-muted: #9b9b9b;--text-placeholder: #b4b4b4;--accent: #2383e2;--accent-light: #e8f2fc;--pastel-green: #dbeddb;--pastel-green-text: #0f7b0f;--pastel-red: #ffe2dd;--pastel-red-text: #c4554d;--pastel-yellow: #fdecc8;--pastel-yellow-text: #9f6b2c;--pastel-blue: #d3e5ef;--pastel-blue-text: #2d6d9a;--pastel-purple: #e8deee;--pastel-purple-text: #6940a5;--border: rgba(55, 53, 47, .09);--border-strong: rgba(55, 53, 47, .16);--font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;--font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, monospace;--radius: 4px;--radius-lg: 8px}*{margin:0;padding:0;box-sizing:border-box}body{font-family:var(--font-sans);background:var(--bg-primary);color:var(--text-primary);line-height:1.5;font-size:14px;-webkit-font-smoothing:antialiased}#root{min-height:100vh}.app-container{display:flex;flex-direction:column;min-height:100vh}.top-header{display:flex;align-items:center;justify-content:space-between;padding:12px 24px;background:var(--bg-secondary);border-bottom:1px solid var(--border);position:sticky;top:0;z-index:100;gap:16px}.header-left{flex-shrink:0}.header-logo{height:32px;width:auto}.header-nav{display:flex;align-items:center;gap:4px;flex:1;justify-content:center}.nav-item{padding:8px 16px;font-size:14px;font-weight:500;color:var(--text-secondary);text-decoration:none;border-radius:var(--radius);white-space:nowrap;transition:all 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var(--accent-light)}.form-input::placeholder{color:var(--text-placeholder)}.form-select{background:var(--bg-primary);border:1px solid var(--border-strong);border-radius:var(--radius);padding:8px 10px;font-size:14px;color:var(--text-primary);font-family:var(--font-sans);cursor:pointer;width:100%}.form-select:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 2px var(--accent-light)}.form-hint{font-size:12px;color:var(--text-muted);margin-top:4px}.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;padding:8px 14px;font-size:14px;font-weight:500;font-family:var(--font-sans);border-radius:var(--radius);border:none;cursor:pointer;transition:background .15s}.btn-primary{background:var(--accent);color:#fff}.btn-primary:hover{background:#1a73d1}.btn-primary:disabled{opacity:.6;cursor:not-allowed}.btn-secondary{background:var(--bg-secondary);color:var(--text-primary);border:1px solid 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0}.section-divider-line{flex:1;height:1px;background:var(--border)}.section-divider-text{font-size:11px;font-weight:600;text-transform:uppercase;letter-spacing:.05em;color:var(--text-muted)}.stats-explanation{display:grid;grid-template-columns:repeat(2,1fr);gap:16px;margin-top:16px}.stats-card{padding:16px;background:var(--bg-secondary);border-radius:var(--radius-lg)}.stats-card-label{font-size:11px;font-weight:600;text-transform:uppercase;letter-spacing:.04em;color:var(--text-muted);margin-bottom:4px}.stats-card-value{font-size:20px;font-weight:600;font-family:var(--font-mono);margin-bottom:8px}.stats-card-explanation{font-size:12px;color:var(--text-secondary);line-height:1.5}.collapsible-section{border:1px solid var(--border);border-radius:var(--radius-lg);margin-bottom:16px}.collapsible-header{display:flex;align-items:center;justify-content:space-between;padding:14px 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var(--border)}.did-arrows{display:flex;justify-content:center;gap:32px}.did-arrow{text-align:center}.did-arrow .arrow-label{display:block;font-size:10px;font-weight:600;text-transform:uppercase;letter-spacing:.04em;color:var(--text-muted);margin-bottom:4px}.did-arrow .arrow-value{display:block;font-family:var(--font-mono);font-size:16px;font-weight:600}.did-arrow.control .arrow-value{color:var(--pastel-blue-text)}.did-arrow.treatment .arrow-value{color:var(--pastel-green-text)}.did-arrow.effect .arrow-value.highlight{color:var(--pastel-purple-text);font-size:20px}.power-curve-container{background:var(--bg-secondary);border-radius:var(--radius-lg);padding:20px;margin-bottom:20px}:root{--pastel-blue-bg: #d3e5ef;--pastel-green-bg: #dbeddb;--pastel-yellow-bg: #fdecc8;--pastel-red-bg: #ffe2dd;--pastel-purple-bg: #e8deee;--border-color: rgba(55, 53, 47, 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