.stddev-calculator{--stddev-primary: #0d9488;--stddev-secondary: #14b8a6;--stddev-accent: #5eead4;--stddev-bg: #f0fdfa;--stddev-card-bg: #ffffff;--stddev-text: #134e4a;--stddev-text-muted: #0f766e;--stddev-border: #99f6e4;--stddev-shadow: 0 4px 20px rgba(13, 148, 136, .12);max-width:900px;margin:0 auto;font-family:system-ui,-apple-system,sans-serif}.stddev-header{text-align:center;margin-bottom:2rem}.stddev-title{font-size:2rem;font-weight:800;color:var(--stddev-primary);margin:0 0 .5rem}.stddev-description{color:var(--stddev-text-muted);font-size:1.1rem;margin:0}.stddev-formula-container{background:linear-gradient(135deg,var(--stddev-bg) 0%,#ccfbf1 100%);border-radius:16px;padding:1.5rem;margin-bottom:2rem;border:1px solid var(--stddev-border)}.stddev-formula-title{font-size:1.1rem;font-weight:700;color:var(--stddev-primary);margin:0 0 1rem;text-align:center}.stddev-formula-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:1rem}.stddev-formula-card{background:var(--stddev-card-bg);border-radius:12px;padding:1rem;text-align:center}.stddev-formula-label{display:block;font-size:.85rem;font-weight:600;color:var(--stddev-text-muted);margin-bottom:.5rem}.stddev-formula-math{font-size:.95rem;color:var(--stddev-text);overflow-x:auto}.stddev-form-container{background:var(--stddev-card-bg);border-radius:16px;padding:1.5rem;box-shadow:var(--stddev-shadow);margin-bottom:2rem}.stddev-form{display:flex;flex-direction:column;gap:1.25rem}.stddev-input-group{display:flex;flex-direction:column;gap:.5rem}.stddev-label{font-weight:600;font-size:.9rem;color:var(--stddev-text)}.stddev-textarea{width:100%;padding:.875rem 1rem;border:2px solid var(--stddev-border);border-radius:10px;font-size:1rem;background:var(--stddev-bg);resize:vertical;font-family:inherit}.stddev-textarea:focus{outline:none;border-color:var(--stddev-primary);background:#fff;box-shadow:0 0 0 4px #0d94881a}.stddev-radio-group{display:flex;gap:1rem}.stddev-radio{display:flex;align-items:center;gap:.5rem;cursor:pointer;padding:.75rem 1rem;background:var(--stddev-bg);border-radius:10px;border:2px solid var(--stddev-border);transition:all .2s}.stddev-radio:has(input:checked){border-color:var(--stddev-primary);background:#fff}.stddev-radio input{accent-color:var(--stddev-primary)}.stddev-buttons{display:flex;gap:1rem}.stddev-btn{flex:1;padding:1rem;border:none;border-radius:10px;font-size:1rem;font-weight:700;cursor:pointer;transition:all .2s}.stddev-btn-primary{background:linear-gradient(135deg,var(--stddev-primary) 0%,var(--stddev-secondary) 100%);color:#fff;box-shadow:0 4px 15px #0d94884d}.stddev-btn-primary:hover{transform:translateY(-2px)}.stddev-btn-secondary{background:var(--stddev-bg);color:var(--stddev-text-muted);border:2px solid var(--stddev-border)}.stddev-results{background:var(--stddev-card-bg);border-radius:16px;padding:1.5rem;box-shadow:var(--stddev-shadow);margin-bottom:2rem}.stddev-results-title{font-size:1.25rem;font-weight:700;color:var(--stddev-primary);margin:0 0 1.5rem;text-align:center}.stddev-main-result{text-align:center;background:linear-gradient(135deg,var(--stddev-primary) 0%,var(--stddev-secondary) 100%);border-radius:16px;padding:2rem;margin-bottom:1.5rem}.stddev-main-label{display:block;font-size:.9rem;color:#ffffffe6;margin-bottom:.5rem}.stddev-main-value{font-size:3rem;font-weight:800;color:#fff}.stddev-summary-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:1rem}.stddev-summary-card{background:var(--stddev-bg);border-radius:12px;padding:1rem;text-align:center}.stddev-summary-label{display:block;font-size:.7rem;font-weight:600;color:var(--stddev-text-muted);margin-bottom:.25rem}.stddev-summary-value{font-size:1rem;font-weight:800;color:var(--stddev-text)}.stddev-content{margin-top:3rem}.stddev-content-section{margin-bottom:2.5rem}.stddev-content-title{font-size:1.5rem;font-weight:700;color:var(--stddev-text);margin:0 0 1rem;padding-bottom:.5rem;border-bottom:3px solid var(--stddev-primary)}.stddev-content-text{color:var(--stddev-text-muted);line-height:1.7;margin:0 0 1rem}.stddev-features-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:1rem;margin-top:1.5rem}.stddev-feature-card{background:var(--stddev-bg);border-radius:12px;padding:1.25rem;text-align:center}.stddev-feature-icon{font-size:2rem;display:block;margin-bottom:.75rem}.stddev-feature-title{font-size:1rem;font-weight:700;color:var(--stddev-text);margin:0 0 .5rem}.stddev-feature-desc{font-size:.85rem;color:var(--stddev-text-muted);margin:0}.stddev-table-wrapper{overflow-x:auto;border-radius:12px;margin-top:1.5rem}.stddev-table{width:100%;border-collapse:collapse;background:#fff;font-size:.9rem}.stddev-table th{background:var(--stddev-primary);color:#fff;padding:.875rem 1rem;text-align:left}.stddev-table td{padding:.75rem 1rem;border-bottom:1px solid var(--stddev-border)}.stddev-table-range{font-weight:700;color:var(--stddev-primary)}.stddev-tips-grid{display:grid;gap:1rem;margin-top:1.5rem}.stddev-tip-card{display:flex;gap:1rem;background:var(--stddev-card-bg);border-radius:12px;padding:1.25rem;border-left:4px solid var(--stddev-primary)}.stddev-tip-icon{font-size:1.5rem}.stddev-tip-title{font-size:1rem;font-weight:700;color:var(--stddev-text);margin:0 0 .5rem}.stddev-tip-text{font-size:.9rem;color:var(--stddev-text-muted);margin:0}.stddev-faqs{display:flex;flex-direction:column;gap:1rem;margin-top:1.5rem}.stddev-faq-item{background:var(--stddev-card-bg);border-radius:12px;padding:1.25rem}.stddev-faq-question{font-size:1rem;font-weight:700;color:var(--stddev-primary);margin:0 0 .75rem}.stddev-faq-answer{font-size:.9rem;color:var(--stddev-text-muted);margin:0;line-height:1.6}@media (max-width: 768px){.stddev-summary-grid{grid-template-columns:repeat(2,1fr)}.stddev-main-value{font-size:2rem}}