:root{--primary-color:#6366f1;--secondary-color:#8b5cf6;--success-color:#10b981;--warning-color:#f59e0b;--danger-color:#ef4444;--card-bg:#fff;--border-color:#e5e7eb}*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,Oxygen,Ubuntu,Cantarell,sans-serif;background:linear-gradient(135deg,#f5f7fa 0%,#c3cfe2 100%);min-height:100vh;color:#333}header{background:linear-gradient(135deg,#667eea 0%,#764ba2 100%);color:#fff;padding:20px 0;box-shadow:0 4px 12px rgba(0,0,0,.15);position:sticky;top:0;z-index:100}.logo{font-size:24px;font-weight:700;color:#fff;text-decoration:none;display:inline-block}.container{max-width:1200px;margin:0 auto;padding:0 20px}.main-wrapper{display:grid;grid-template-columns:1fr 300px;gap:24px;margin:30px 0}@media(max-width:1024px){.main-wrapper{grid-template-columns:1fr}}.content-area{display:flex;flex-direction:column;gap:24px}.card{background:var(--card-bg);border-radius:12px;padding:30px;box-shadow:0 4px 15px rgba(0,0,0,.1);transition:all .3s ease}.card:hover{box-shadow:0 8px 25px rgba(0,0,0,.15)}.card h1{color:var(--primary-color);margin-bottom:10px;font-size:32px}.card h2{color:var(--primary-color);margin-bottom:20px;font-size:24px}.subtitle{color:#666;font-size:16px;margin-bottom:24px}.data-input-section{display:grid;grid-template-columns:1fr 1fr;gap:24px;margin-bottom:24px}@media(max-width:768px){.data-input-section{grid-template-columns:1fr}}.input-column{position:relative}.input-column h4{color:var(--primary-color);margin-bottom:12px;font-size:16px;font-weight:600;display:flex;align-items:center;gap:8px}.error-message{background:linear-gradient(135deg,#fee 0%,#ffeaea 100%);color:#dc2626;padding:14px 16px;border-radius:8px;margin-bottom:20px;border:1px solid #fecaca;font-size:14px;display:flex;align-items:center;gap:10px;animation:slideIn .3s ease}@keyframes slideIn{from{opacity:0;transform:translateY(-10px)}to{opacity:1;transform:translateY(0)}}.sheet-table{width:100%;border-collapse:separate;border-spacing:0}.sheet-table thead th{background:linear-gradient(135deg,#667eea 0%,#764ba2 100%);color:#fff;font-weight:600;padding:14px 12px;text-align:left;position:sticky;top:0}.sheet-table tbody tr{transition:all .2s ease}.sheet-table tbody tr:hover{background:linear-gradient(135deg,#f8f9ff 0%,#f0f2ff 100%)}.sheet-table td{padding:12px;border-bottom:1px solid var(--border-color)}.row-number{color:#6b7280;font-weight:500;width:40px}.cell{width:100%;padding:10px 12px;border:2px solid #e5e7eb;border-radius:6px;font-size:14px;transition:all .2s ease;background:#fff}.cell:focus{outline:none;border-color:var(--primary-color);box-shadow:0 0 0 3px rgba(99,102,241,.1)}.cell.invalid{border-color:var(--danger-color);background:linear-gradient(135deg,#fef2f2 0%,#fee 100%)}.delete-btn{background:linear-gradient(135deg,#f87171 0%,#ef4444 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spin{0%{transform:rotate(0)}100%{transform:rotate(360deg)}}.chart-container{margin:30px 0;padding:20px;background:#fff;border-radius:12px;box-shadow:0 4px 6px rgba(0,0,0,.05)}.data-summary{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:15px;margin:20px 0}.summary-item{padding:12px;background:#f8fafc;border-radius:8px;font-size:13px}.export-buttons{display:flex;gap:10px;margin-top:20px}.confidence-interval{background:#f0f9ff;border-radius:8px;padding:16px;margin:20px 0}.sidebar{position:sticky;top:100px;max-height:calc(100vh - 120px);overflow-y:auto}.sidebar-section{margin-bottom:20px}.sidebar-section h3{color:var(--primary-color);font-size:16px;margin-bottom:15px}.sidebar-links{display:flex;flex-direction:column;gap:8px}.sidebar-link{color:var(--primary-color);text-decoration:none;font-size:14px;padding:8px;border-radius:6px;transition:all .2s ease}.sidebar-link:hover{background:rgba(99,102,241,.1);transform:translateX(4px)}footer{background:#1f2937;color:#fff;text-align:center;padding:30px 20px;margin-top:50px}footer p{margin:10px 0;font-size:14px}footer a{color:var(--primary-color);text-decoration:none}footer a:hover{text-decoration:underline}