:root{--bg-primary: #f8fafc;--bg-surface: #ffffff;--bg-surface-elevated: #ffffff;--bg-subtle: #f1f5f9;--bg-input: #ffffff;--text-primary: #0f172a;--text-secondary: #475569;--text-muted: #64748b;--text-inverse: #ffffff;--brand-primary: #2563eb;--brand-primary-hover: #1d4ed8;--brand-light: #eff6ff;--brand-border: #bfdbfe;--border-color: #e2e8f0;--border-focus: #3b82f6;--shadow-sm: 0 1px 2px 0 rgb(0 0 0 / .05);--shadow-md: 0 4px 6px -1px rgb(0 0 0 / .07), 0 2px 4px -2px rgb(0 0 0 / .07);--shadow-lg: 0 10px 15px -3px rgb(0 0 0 / .08), 0 4px 6px -4px rgb(0 0 0 / .05);--shadow-xl: 0 20px 25px -5px rgb(0 0 0 / .1), 0 8px 10px -6px rgb(0 0 0 / .1);--radius-sm: 6px;--radius-md: 10px;--radius-lg: 16px;--radius-full: 9999px;--color-success: #16a34a;--color-success-bg: #f0fdf4;--color-warning: #d97706;--color-warning-bg: #fffbeb;--color-danger: #dc2626;--color-danger-bg: #fef2f2;--grade-aplus: #15803d;--grade-a: #16a34a;--grade-aminus: #22c55e;--grade-bplus: #2563eb;--grade-b: #3b82f6;--grade-bminus: #60a5fa;--grade-cplus: #d97706;--grade-c: #f59e0b;--grade-cminus: #fbbf24;--grade-dplus: #ea580c;--grade-d: #f97316;--grade-dminus: #fb923c;--grade-f: #dc2626;--font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;--transition: all .2s cubic-bezier(.4, 0, .2, 1)}[data-theme=dark]{--bg-primary: #0b0f19;--bg-surface: #111827;--bg-surface-elevated: #1f2937;--bg-subtle: #1f2937;--bg-input: #1f2937;--text-primary: #f9fafb;--text-secondary: #d1d5db;--text-muted: #9ca3af;--text-inverse: #0f172a;--brand-primary: #3b82f6;--brand-primary-hover: #60a5fa;--brand-light: #1e3a8a;--brand-border: #1d4ed8;--border-color: #374151;--border-focus: #60a5fa;--shadow-sm: 0 1px 2px 0 rgb(0 0 0 / .5);--shadow-md: 0 4px 6px -1px rgb(0 0 0 / .4);--shadow-lg: 0 10px 15px -3px rgb(0 0 0 / .4);--shadow-xl: 0 20px 25px -5px rgb(0 0 0 / .5);--color-success-bg: #064e3b;--color-warning-bg: #78350f;--color-danger-bg: 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auto;padding-bottom:3rem}h1,h2,h3,h4,h5,h6{color:var(--text-primary);font-weight:700;line-height:1.25;margin-bottom:.75rem}h1{font-size:2.25rem;letter-spacing:-.025em}h2{font-size:1.65rem;letter-spacing:-.02em;margin-top:2.5rem;padding-bottom:.5rem;border-bottom:1px solid var(--border-color)}h3{font-size:1.25rem;margin-top:1.5rem}p{color:var(--text-secondary);font-size:1.05rem;margin-bottom:1rem;line-height:1.65}.site-header{position:sticky;top:0;z-index:50;background-color:#ffffffd9;backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border-bottom:1px solid var(--border-color);transition:var(--transition)}[data-theme=dark] .site-header{background-color:#111827d9}.header-container{display:flex;align-items:center;justify-content:space-between;height:4.25rem}.brand-logo{display:flex;align-items:center;gap:.6rem;font-size:1.4rem;font-weight:800;color:var(--text-primary);text-decoration:none!important;letter-spacing:-.02em}.logo-icon{width:2.1rem;height:2.1rem;background:linear-gradient(135deg,#2563eb,#3b82f6);color:#fff;border-radius:var(--radius-md);display:flex;align-items:center;justify-content:center;box-shadow:0 2px 8px #2563eb4d}.nav-links{display:flex;align-items:center;gap:1.5rem;list-style:none}.nav-link{font-weight:500;color:var(--text-secondary);padding:.5rem .75rem;border-radius:var(--radius-sm);transition:var(--transition)}.nav-link:hover,.nav-link.active{color:var(--brand-primary);background-color:var(--bg-subtle);text-decoration:none}.header-actions{display:flex;align-items:center;gap:.75rem}.theme-toggle-btn{display:flex;align-items:center;justify-content:center;width:2.5rem;height:2.5rem;border-radius:var(--radius-full);color:var(--text-secondary);background-color:var(--bg-subtle);border:1px solid var(--border-color);transition:var(--transition)}.theme-toggle-btn:hover{color:var(--brand-primary);border-color:var(--brand-border)}.mobile-menu-toggle{display:none;align-items:center;justify-content:center;width:2.5rem;height:2.5rem;border-radius:var(--radius-md);color:var(--text-primary);background-color:var(--bg-subtle)}.mobile-nav-overlay,.mobile-nav-drawer{display:none}@media(max-width:768px){.desktop-nav{display:none}.mobile-menu-toggle{display:flex}h1{font-size:1.75rem}h2{font-size:1.35rem}.mobile-nav-drawer{position:fixed;top:4.25rem;left:0;right:0;bottom:0;background-color:var(--bg-surface);z-index:40;padding:1.5rem;display:flex;flex-direction:column;gap:1rem;border-top:1px solid var(--border-color);transform:translateY(-100%);opacity:0;pointer-events:none;transition:transform .3s ease,opacity .3s ease}.mobile-nav-drawer.open{transform:translateY(0);opacity:1;pointer-events:auto}.mobile-nav-link{font-size:1.2rem;font-weight:600;padding:.85rem 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var(--brand-border);margin-bottom:.5rem}.hero-subtitle{max-width:680px;margin:.5rem auto 1.75rem;color:var(--text-secondary);font-size:1.15rem}.calculator-wrapper{max-width:680px;margin:0 auto 2.5rem}.calculator-card{background-color:var(--bg-surface);border:1px solid var(--border-color);border-radius:var(--radius-lg);box-shadow:var(--shadow-xl);padding:1.75rem;transition:var(--transition);position:relative;overflow:hidden}.calculator-card:before{content:"";position:absolute;top:0;left:0;right:0;height:4px;background:linear-gradient(90deg,#2563eb,#3b82f6,#60a5fa)}.calc-grid{display:grid;grid-template-columns:1fr 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var(--border-color);border-radius:var(--radius-sm);color:var(--text-primary);font-size:1.1rem;font-weight:700;transition:var(--transition);-webkit-user-select:none;user-select:none;touch-action:manipulation}.control-btn:hover:not(:disabled){background-color:var(--brand-light);color:var(--brand-primary);border-color:var(--brand-border)}.control-btn:disabled{opacity:.4;cursor:not-allowed}.validation-alert{display:flex;align-items:flex-start;gap:.75rem;padding:1rem 1.25rem;background-color:var(--color-danger-bg);border:1px solid rgba(220,38,38,.2);border-radius:var(--radius-md);color:var(--color-danger);margin-bottom:1.25rem;font-size:.95rem;font-weight:500;animation:fadeIn .2s ease-in-out}@keyframes fadeIn{0%{opacity:0;transform:translateY(-4px)}to{opacity:1;transform:translateY(0)}}.result-box{background-color:var(--bg-subtle);border:1px solid 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var(--border-color)}.stat-item{display:flex;flex-direction:column;align-items:center}.stat-value{font-size:1.25rem;font-weight:700;color:var(--text-primary)}.stat-label{font-size:.8rem;color:var(--text-muted);font-weight:500}.grade-bar-wrapper{width:100%;height:8px;background-color:var(--border-color);border-radius:var(--radius-full);overflow:hidden;margin:1.25rem 0 .5rem}.grade-bar-fill{height:100%;border-radius:var(--radius-full);transition:width .4s ease,background-color .4s ease}.calc-actions{display:flex;align-items:center;justify-content:space-between;margin-top:1.25rem;gap:.75rem}.btn-secondary{display:inline-flex;align-items:center;gap:.4rem;padding:.6rem 1rem;font-size:.9rem;font-weight:600;border-radius:var(--radius-md);color:var(--text-secondary);background-color:var(--bg-surface);border:1px solid var(--border-color);transition:var(--transition)}.btn-secondary:hover{background-color:var(--bg-subtle);color:var(--text-primary);border-color:var(--text-muted)}.btn-primary{display:inline-flex;align-items:center;gap:.5rem;padding:.6rem 1.15rem;font-size:.9rem;font-weight:600;border-radius:var(--radius-md);color:#fff;background-color:var(--brand-primary);border:1px solid var(--brand-primary);box-shadow:0 2px 4px #2563eb33;transition:var(--transition)}.btn-primary:hover{background-color:var(--brand-primary-hover)}.scale-disclaimer-note{margin-top:1rem;font-size:.8rem;color:var(--text-muted);text-align:center;line-height:1.4}.content-card{background-color:var(--bg-surface);border:1px solid var(--border-color);border-radius:var(--radius-lg);padding:2rem;margin-bottom:2rem;box-shadow:var(--shadow-sm)}@media(max-width:640px){.content-card{padding:1.25rem}}.table-responsive{width:100%;overflow-x:auto;margin:1.5rem 0;border-radius:var(--radius-md);border:1px solid var(--border-color)}.custom-table{width:100%;border-collapse:collapse;text-align:left;font-size:.95rem}.custom-table th{background-color:var(--bg-subtle);color:var(--text-primary);font-weight:700;padding:.85rem 1rem;border-bottom:2px solid var(--border-color)}.custom-table td{padding:.75rem 1rem;border-bottom:1px solid var(--border-color);color:var(--text-secondary)}.custom-table tr:last-child td{border-bottom:none}.custom-table tr:nth-child(2n){background-color:#00000004}[data-theme=dark] .custom-table tr:nth-child(2n){background-color:#ffffff05}.features-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:1.25rem;margin:1.5rem 0}.feature-box{background-color:var(--bg-subtle);border:1px solid var(--border-color);border-radius:var(--radius-md);padding:1.25rem;transition:var(--transition)}.feature-box:hover{border-color:var(--brand-border);transform:translateY(-2px)}.feature-icon{width:2.25rem;height:2.25rem;border-radius:var(--radius-sm);background-color:var(--brand-light);color:var(--brand-primary);display:flex;align-items:center;justify-content:center;margin-bottom:.75rem}.feature-title{font-size:1.1rem;font-weight:700;margin-bottom:.35rem;color:var(--text-primary)}.feature-desc{font-size:.9rem;color:var(--text-secondary);margin-bottom:0}.faq-list{display:flex;flex-direction:column;gap:.85rem;margin-top:1.5rem}.faq-item{background-color:var(--bg-surface);border:1px solid var(--border-color);border-radius:var(--radius-md);overflow:hidden;transition:var(--transition)}.faq-question{width:100%;padding:1.1rem 1.25rem;display:flex;align-items:center;justify-content:space-between;font-weight:600;font-size:1.05rem;color:var(--text-primary);text-align:left;background-color:var(--bg-surface);transition:var(--transition)}.faq-question:hover{background-color:var(--bg-subtle)}.faq-answer{padding:0 1.25rem 1.25rem;color:var(--text-secondary);font-size:.95rem;line-height:1.6;border-top:1px solid transparent}.modal-overlay{position:fixed;top:0;left:0;right:0;bottom:0;background-color:#00000080;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);z-index:100;display:flex;align-items:center;justify-content:center;padding:1rem;animation:fadeIn .2s ease}.modal-card{background-color:var(--bg-surface);border-radius:var(--radius-lg);border:1px solid var(--border-color);max-width:600px;width:100%;max-height:90vh;overflow-y:auto;padding:1.5rem;box-shadow:var(--shadow-xl)}.modal-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:1rem;padding-bottom:.75rem;border-bottom:1px solid var(--border-color)}.site-footer{margin-top:auto;background-color:var(--bg-surface);border-top:1px solid var(--border-color);padding:3rem 0 2rem;transition:var(--transition)}.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr;gap:2.5rem;margin-bottom:2.5rem}@media(max-width:768px){.footer-grid{grid-template-columns:1fr;gap:1.75rem}}.footer-brand-text{font-size:.95rem;color:var(--text-muted);margin-top:.75rem;max-width:320px}.footer-title{font-size:1rem;font-weight:700;color:var(--text-primary);margin-bottom:1rem;text-transform:uppercase;letter-spacing:.05em}.footer-links{list-style:none;display:flex;flex-direction:column;gap:.6rem}.footer-links a{color:var(--text-secondary);font-size:.95rem;transition:var(--transition)}.footer-links a:hover{color:var(--brand-primary);text-decoration:none}.footer-bottom{padding-top:1.5rem;border-top:1px solid var(--border-color);text-align:center;color:var(--text-muted);font-size:.875rem}.bg-grade-aplus,.bg-grade-a,.bg-grade-aminus{background-color:var(--grade-a)}.bg-grade-bplus,.bg-grade-b,.bg-grade-bminus{background-color:var(--grade-b)}.bg-grade-cplus,.bg-grade-c,.bg-grade-cminus{background-color:var(--grade-c)}.bg-grade-dplus,.bg-grade-d,.bg-grade-dminus{background-color:var(--grade-d)}.bg-grade-f{background-color:var(--grade-f)}.toast-msg{position:fixed;bottom:2rem;right:2rem;background-color:var(--text-primary);color:var(--bg-surface);padding:.75rem 1.25rem;border-radius:var(--radius-md);font-weight:600;font-size:.9rem;box-shadow:var(--shadow-lg);z-index:200;animation:slideUp .3s ease}@keyframes slideUp{0%{transform:translateY(100%);opacity:0}to{transform:translateY(0);opacity:1}}a:focus-visible,button:focus-visible,input:focus-visible{outline:2px solid var(--brand-primary);outline-offset:2px}