.pct-calculator{--pct-primary: #3b82f6;--pct-secondary: #60a5fa;--pct-accent: #2563eb;--pct-dark: #1e3a8a;--pct-light: #eff6ff;--pct-text: #1f2937;--pct-text-muted: #6b7280;--pct-border: #d1d5db;--pct-card-bg: #ffffff;--pct-section-bg: #f8fafc;font-family:system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;max-width:900px;margin:0 auto;color:var(--pct-text)}.pct-header{text-align:center;margin-bottom:2rem;padding:2rem;background:linear-gradient(135deg,var(--pct-dark) 0%,var(--pct-primary) 100%);border-radius:16px;color:#fff}.pct-title{font-size:2rem;font-weight:800;margin:0 0 .75rem}.pct-title:before{content:"%";margin-right:.5rem;opacity:.8}.pct-description{font-size:1.1rem;margin:0;opacity:.9}.pct-formula-section{background:var(--pct-light);border-radius:12px;padding:1.5rem;margin-bottom:2rem;border:2px solid var(--pct-secondary)}.pct-formula-title{font-size:1.1rem;font-weight:700;color:var(--pct-primary);margin:0 0 1rem;text-align:center}.pct-formula-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:1rem}.pct-formula-card{background:#fff;border-radius:10px;padding:1rem;border:1px solid var(--pct-border)}.pct-formula-label{font-size:.85rem;font-weight:600;color:var(--pct-primary);margin:0 0 .5rem;text-align:center}.pct-formula-display{text-align:center;overflow-x:auto;padding:.5rem 0}.pct-form-section{background:var(--pct-card-bg);border-radius:16px;padding:1.5rem;margin-bottom:2rem;box-shadow:0 4px 20px #00000014;border:1px solid var(--pct-border)}.pct-mode-selector{display:grid;grid-template-columns:repeat(2,1fr);gap:.5rem;margin-bottom:1.5rem}@media (min-width: 640px){.pct-mode-selector{grid-template-columns:repeat(4,1fr)}}.pct-mode-btn{padding:.75rem .5rem;border:2px solid var(--pct-border);background:#fff;border-radius:8px;font-size:.85rem;font-weight:600;color:var(--pct-text-muted);cursor:pointer;transition:all .2s;text-align:center}.pct-mode-btn:hover{border-color:var(--pct-primary);color:var(--pct-primary)}.pct-mode-btn.active{background:var(--pct-primary);border-color:var(--pct-primary);color:#fff}.pct-mode-form{display:none}.pct-mode-form.active{display:block}.pct-equation-layout{display:flex;flex-wrap:wrap;align-items:center;justify-content:center;gap:.75rem;margin-bottom:1.5rem;padding:1.5rem;background:var(--pct-section-bg);border-radius:12px}.pct-equation-text{font-size:1.1rem;color:var(--pct-text);font-weight:500}.pct-input-inline{display:flex;align-items:center;background:#fff;border:2px solid var(--pct-border);border-radius:8px;overflow:hidden;transition:border-color .2s,box-shadow .2s}.pct-input-inline:focus-within{border-color:var(--pct-primary);box-shadow:0 0 0 3px #3b82f626}.pct-input{width:100px;padding:.75rem;border:none;background:transparent;font-size:1.1rem;font-weight:600;text-align:center;color:var(--pct-text)}.pct-input:focus{outline:none}.pct-unit{padding:.75rem .5rem;background:var(--pct-light);color:var(--pct-primary);font-weight:600;font-size:1rem}.pct-buttons{display:flex;gap:.75rem}.pct-btn{flex:1;padding:1rem;border:none;border-radius:10px;font-size:1rem;font-weight:600;cursor:pointer;transition:all .2s;display:flex;align-items:center;justify-content:center;gap:.5rem}.pct-btn-primary{background:linear-gradient(135deg,var(--pct-primary),var(--pct-accent));color:#fff;box-shadow:0 4px 15px #3b82f64d}.pct-btn-primary:hover{transform:translateY(-2px);box-shadow:0 6px 20px #3b82f666}.pct-btn-icon{font-size:1.25rem;font-weight:700}.pct-btn-secondary{background:var(--pct-section-bg);color:var(--pct-text-muted);border:1px solid var(--pct-border)}.pct-btn-secondary:hover{background:#fff;color:var(--pct-text)}.pct-results{background:linear-gradient(135deg,var(--pct-dark) 0%,var(--pct-primary) 100%);border-radius:16px;padding:2rem;margin-bottom:2rem;color:#fff;text-align:center}.pct-results-title{font-size:1.1rem;font-weight:600;margin:0 0 1rem;opacity:.9}.pct-result-display{display:flex;align-items:baseline;justify-content:center;gap:.25rem;margin-bottom:1rem;transition:color .3s}.pct-result-display.increase{color:#86efac}.pct-result-display.decrease{color:#fca5a5}.pct-result-value{font-size:4rem;font-weight:800;line-height:1}.pct-result-unit{font-size:2rem;font-weight:600;opacity:.8}.pct-result-description{font-size:1.1rem;margin:0 0 1rem;opacity:.9}.pct-calculation-breakdown{font-size:.95rem;font-family:Consolas,Monaco,monospace;background:#ffffff1a;padding:.75rem 1rem;border-radius:8px;display:inline-block}.pct-content{margin-top:2rem}.pct-content-section{margin-bottom:2.5rem}.pct-content-title{font-size:1.5rem;font-weight:700;color:var(--pct-primary);margin:0 0 1rem;padding-bottom:.5rem;border-bottom:3px solid var(--pct-secondary)}.pct-content-paragraph{font-size:1rem;line-height:1.7;color:var(--pct-text);margin:0 0 1rem}.pct-subsection{margin:1.5rem 0}.pct-subsection-title{font-size:1.25rem;font-weight:600;color:var(--pct-dark);margin:0 0 1rem}.pct-features-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:1rem;margin-top:1rem}.pct-feature-card{background:var(--pct-light);border-radius:12px;padding:1.25rem;text-align:center;border:1px solid var(--pct-secondary)}.pct-feature-icon{font-size:2rem;display:block;margin-bottom:.75rem}.pct-feature-title{font-size:1rem;font-weight:700;color:var(--pct-primary);margin:0 0 .5rem}.pct-feature-description{font-size:.9rem;color:var(--pct-text-muted);margin:0;line-height:1.5}.pct-types-list{display:flex;flex-direction:column;gap:1.5rem;margin-top:1.5rem}.pct-type-card{display:flex;gap:1rem;background:var(--pct-card-bg);border-radius:12px;padding:1.5rem;border:1px solid var(--pct-border);box-shadow:0 2px 8px #0000000d}.pct-type-number{width:40px;height:40px;background:var(--pct-primary);color:#fff;border-radius:50%;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:1.25rem;flex-shrink:0}.pct-type-content{flex:1}.pct-type-title{font-size:1.1rem;font-weight:700;color:var(--pct-dark);margin:0 0 .5rem}.pct-type-description{font-size:.95rem;color:var(--pct-text);margin:0 0 .75rem;line-height:1.6}.pct-type-formula{background:var(--pct-light);padding:.75rem;border-radius:8px;text-align:center;overflow-x:auto}.pct-tips-grid{display:grid;grid-template-columns:1fr;gap:1rem;margin-top:1.5rem}@media (min-width: 768px){.pct-tips-grid{grid-template-columns:repeat(3,1fr)}}.pct-tip-card{background:var(--pct-card-bg);border-radius:12px;padding:1.25rem;border:1px solid var(--pct-border)}.pct-tip-header{display:flex;align-items:center;gap:.75rem;margin-bottom:1rem}.pct-tip-icon{font-size:1.5rem}.pct-tip-title{font-size:1rem;font-weight:700;color:var(--pct-primary);margin:0}.pct-tip-list{margin:0;padding-left:1.25rem;font-size:.9rem;line-height:1.8;color:var(--pct-text)}.pct-scenarios-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:1rem;margin-top:1.5rem}.pct-scenario-card{background:var(--pct-light);border-radius:12px;padding:1.25rem;border-left:4px solid var(--pct-primary)}.pct-scenario-icon{font-size:1.5rem;display:block;margin-bottom:.5rem}.pct-scenario-title{font-size:1rem;font-weight:700;color:var(--pct-dark);margin:0 0 .5rem}.pct-scenario-content{font-size:.9rem;color:var(--pct-text);margin:0;line-height:1.6}.pct-advanced-list{display:flex;flex-direction:column;gap:1.5rem;margin-top:1.5rem}.pct-advanced-card{background:var(--pct-card-bg);border-radius:12px;padding:1.5rem;border:1px solid var(--pct-border);box-shadow:0 2px 8px #0000000d}.pct-advanced-title{font-size:1.1rem;font-weight:700;color:var(--pct-primary);margin:0 0 .75rem}.pct-advanced-content{font-size:.95rem;color:var(--pct-text);margin:0 0 1rem;line-height:1.6}.pct-advanced-formula{background:var(--pct-light);padding:1rem;border-radius:8px;text-align:center;margin:1rem 0;overflow-x:auto}.pct-advanced-conclusion{font-size:.95rem;color:var(--pct-text);margin:0;padding-top:.75rem;border-top:1px solid var(--pct-border)}.pct-industry-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:1.5rem;margin-top:1.5rem}.pct-industry-card{background:var(--pct-card-bg);border-radius:12px;padding:1.5rem;border:1px solid var(--pct-border)}.pct-industry-header{display:flex;align-items:center;gap:.75rem;margin-bottom:1rem}.pct-industry-icon{font-size:1.75rem}.pct-industry-title{font-size:1.1rem;font-weight:700;color:var(--pct-dark);margin:0}.pct-industry-list{margin:0;padding-left:1.25rem;font-size:.9rem;line-height:1.8;color:var(--pct-text)}.pct-math-grid{display:flex;flex-direction:column;gap:1.5rem;margin-top:1.5rem}.pct-math-card{background:var(--pct-light);border-radius:12px;padding:1.5rem;border:1px solid var(--pct-secondary)}.pct-math-header{display:flex;align-items:center;gap:.75rem;margin-bottom:1rem}.pct-math-icon{font-size:1.5rem}.pct-math-title{font-size:1.1rem;font-weight:700;color:var(--pct-primary);margin:0}.pct-math-content{font-size:.95rem;color:var(--pct-text);margin:0 0 1rem;line-height:1.6}.pct-math-formula{background:#fff;padding:1rem;border-radius:8px;text-align:center;margin:.75rem 0;overflow-x:auto}.pct-math-example,.pct-math-explanation{font-size:.9rem;color:var(--pct-text-muted);margin:.5rem 0 0;font-style:italic}.pct-examples-list{display:flex;flex-direction:column;gap:2rem;margin-top:1.5rem}.pct-example-card{background:var(--pct-card-bg);border-radius:12px;padding:1.5rem;border:1px solid var(--pct-border);box-shadow:0 2px 8px #0000000d}.pct-example-header{display:flex;align-items:center;gap:.75rem;margin-bottom:1rem}.pct-example-icon{font-size:1.5rem}.pct-example-title{font-size:1.1rem;font-weight:700;color:var(--pct-primary);margin:0}.pct-example-scenario{font-size:.95rem;color:var(--pct-text);margin:0 0 1.25rem;padding:1rem;background:var(--pct-light);border-radius:8px}.pct-example-steps{display:flex;flex-direction:column;gap:1rem}.pct-step{padding:1rem;background:var(--pct-section-bg);border-radius:8px;border-left:3px solid var(--pct-primary)}.pct-step-title{font-size:.95rem;font-weight:600;color:var(--pct-dark);margin:0 0 .5rem}.pct-step-formula{text-align:center;padding:.5rem 0;overflow-x:auto}.pct-step-content{font-size:.9rem;color:var(--pct-text);margin:0}.pct-example-result,.pct-example-insight{font-size:.95rem;margin:1rem 0 0;padding:.75rem;border-radius:8px}.pct-example-result{background:#3b82f61a;color:var(--pct-dark)}.pct-example-insight{background:#f59e0b1a;color:#92400e}.pct-categories{display:flex;flex-direction:column;gap:2rem;margin-top:1.5rem}.pct-category-title{font-size:1.1rem;font-weight:700;color:var(--pct-dark);margin:0 0 1rem}.pct-mistakes-list{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:1rem}.pct-mistake-card{padding:1rem;border-radius:10px}.pct-mistake-card.error{background:#ef44441a;border-left:4px solid #ef4444}.pct-mistake-card.correct{background:#22c55e1a;border-left:4px solid #22c55e}.pct-mistake-title{font-size:.95rem;font-weight:600;margin:0 0 .5rem}.pct-mistake-description{font-size:.9rem;color:var(--pct-text);margin:0 0 .5rem}.pct-mistake-example{font-size:.85rem;color:var(--pct-text-muted);margin:0}@media (max-width: 640px){.pct-header{padding:1.5rem}.pct-title{font-size:1.5rem}.pct-equation-layout{padding:1rem;gap:.5rem}.pct-input{width:80px;font-size:1rem}.pct-equation-text{font-size:.95rem}.pct-result-value{font-size:3rem}.pct-type-card{flex-direction:column;align-items:flex-start}}