:root{--color-primary:#1e3a5f;--color-primary-light:#2d4a6f;--color-primary-dark:#0f2744;--color-accent:#d97706;--color-accent-light:#e58a1a;--color-accent-dark:#b45309;--color-gain:#10b981;--color-loss:#ef4444;--color-warning:#f59e0b;--color-warning-light:#fbbf24;--color-warning-dark:#d97706;--text-primary:#0f172a;--text-secondary:#475569;--text-muted:#64748b;--bg-primary:#ffffff;--bg-secondary:#f8fafc;--bg-tertiary:#f1f5f9;--border-light:#e2e8f0;--border-medium:#cbd5e1;--shadow-sm:0 1px 2px 0 rgb(0 0 0 / 0.05);--shadow-md:0 4px 6px -1px rgb(0 0 0 / 0.1),0 2px 4px -2px rgb(0 0 0 / 0.1);--shadow-lg:0 10px 15px -3px rgb(0 0 0 / 0.1),0 4px 6px -4px rgb(0 0 0 / 0.1);--shadow-glow:0 0 20px rgba(30, 58, 95, 0.15);--radius-sm:0.375rem;--radius-md:0.5rem;--radius-lg:0.75rem;--radius-xl:1rem;--transition-fast:150ms ease;--transition-normal:200ms ease;--gradient-hero:linear-gradient(135deg, #0f2744 0%, #1e3a5f 50%, #2d4a6f 100%);--gradient-hero-dark:linear-gradient(135deg, #0a1929 0%, #0f2744 50%, #1e3a5f 100%);--gradient-gain:linear-gradient(135deg, #059669 0%, #10b981 100%)}[data-theme=dark]{--text-primary:#f1f5f9;--text-secondary:#cbd5e1;--text-muted:#94a3b8;--bg-primary:#0f172a;--bg-secondary:#1e293b;--bg-tertiary:#334155;--border-light:#334155;--border-medium:#475569;--shadow-glow:0 0 20px rgba(45, 74, 111, 0.3)}body{font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,'Helvetica Neue',Arial,sans-serif;color:var(--text-primary);line-height:1.6;background-color:var(--bg-secondary);transition:background-color var(--transition-normal),color var(--transition-normal)}[data-theme=dark] body{background-color:var(--bg-primary)}.hero-gradient{background:var(--gradient-hero);position:relative;overflow:hidden}[data-theme=dark] .hero-gradient{background:var(--gradient-hero-dark)}.hero-gradient::before{content:'';position:absolute;top:0;left:0;right:0;bottom:0;background:radial-gradient(ellipse at 30% 20%,rgba(255,255,255,.08) 0,transparent 50%);pointer-events:none}.calc-card{background:var(--bg-primary);border-radius:var(--radius-lg);box-shadow:var(--shadow-md);padding:1.5rem;border:1px solid var(--border-light);transition:transform var(--transition-normal),box-shadow var(--transition-normal)}.calc-card:hover{transform:translateY(-2px);box-shadow:var(--shadow-lg)}.calc-card-icon{width:3rem;height:3rem;border-radius:var(--radius-md);display:flex;align-items:center;justify-content:center;background:rgba(30,58,95,.1);color:var(--color-primary)}[data-theme=dark] .calc-card-icon{background:rgba(45,74,111,.3);color:#7da4d4}.form-input{width:100%;padding:.75rem 1rem;border:1px solid var(--border-light);border-radius:var(--radius-md);font-size:1rem;transition:border-color var(--transition-fast),box-shadow var(--transition-fast);background-color:var(--bg-primary);color:var(--text-primary)}.form-input:focus{outline:0;border-color:var(--color-primary);box-shadow:0 0 0 3px rgba(30,58,95,.15)}.form-input:invalid:not(:placeholder-shown){border-color:var(--color-loss)}.form-label{display:block;font-weight:600;margin-bottom:.5rem;color:var(--text-primary)}.form-hint{font-size:.875rem;color:var(--text-muted);margin-top:.25rem}.form-error{font-size:.875rem;color:var(--color-loss);margin-top:.25rem}.result-card{background:var(--gradient-gain);color:#fff;border-radius:var(--radius-lg);padding:1.5rem;box-shadow:var(--shadow-lg)}.result-card.negative{background:linear-gradient(135deg,#dc2626 0,#ef4444 100%)}.result-value{font-size:2.5rem;font-weight:700;line-height:1.2}.result-label{font-size:.875rem;opacity:.9;text-transform:uppercase;letter-spacing:.05em}.counter-animate{display:inline-block;transition:transform var(--transition-fast)}.feature-card{background:var(--bg-primary);border-radius:var(--radius-lg);padding:1.5rem;border:1px solid var(--border-light);transition:box-shadow var(--transition-normal)}.feature-card:hover{box-shadow:var(--shadow-glow)}.feature-icon{width:4rem;height:4rem;border-radius:50%;display:flex;align-items:center;justify-content:center;margin:0 auto 1rem;background:linear-gradient(135deg,rgba(30,58,95,.1) 0,rgba(217,119,6,.08) 100%)}[data-theme=dark] .feature-icon{background:linear-gradient(135deg,rgba(30,58,95,.3) 0,rgba(217,119,6,.15) 100%)}.btn{display:inline-flex;align-items:center;justify-content:center;gap:.5rem;padding:.75rem 1.5rem;font-weight:600;border-radius:var(--radius-md);transition:all var(--transition-fast);cursor:pointer;border:none;font-size:1rem}.btn-primary{background-color:var(--color-primary);color:#fff}.btn-primary:hover{background-color:var(--color-primary-dark)}.btn-accent{background-color:var(--color-accent);color:#fff}.btn-accent:hover{background-color:var(--color-accent-dark)}.btn-outline{background-color:transparent;border:2px solid var(--color-primary);color:var(--color-primary)}.btn-outline:hover{background-color:var(--color-primary);color:#fff}[data-theme=dark] .btn-outline{border-color:#7da4d4;color:#7da4d4}[data-theme=dark] .btn-outline:hover{background-color:#7da4d4;color:#0f172a}.theme-toggle{display:flex;align-items:center;justify-content:center;width:2.5rem;height:2.5rem;border-radius:50%;background:var(--bg-tertiary);border:1px solid var(--border-light);cursor:pointer;transition:background-color var(--transition-fast),border-color var(--transition-fast)}.theme-toggle:hover{background:var(--border-light)}.theme-toggle svg{width:1.25rem;height:1.25rem;color:var(--text-secondary);transition:color var(--transition-fast)}.theme-toggle:hover svg{color:var(--text-primary)}.theme-toggle .icon-sun{display:none}.theme-toggle .icon-moon{display:block}[data-theme=dark] .theme-toggle .icon-sun{display:block}[data-theme=dark] .theme-toggle .icon-moon{display:none}.alert{padding:1rem;border-radius:var(--radius-md);margin-bottom:1rem}.alert-info{background-color:rgba(30,58,95,.1);border-left:4px solid var(--color-primary);color:#1e3a5f}.alert-success{background-color:rgba(16,185,129,.1);border-left:4px solid var(--color-gain);color:#065f46}.alert-warning{background-color:rgba(245,158,11,.1);border-left:4px solid var(--color-warning);color:#92400e}[data-theme=dark] .alert-info{background-color:rgba(30,58,95,.3);color:#93c5fd}[data-theme=dark] .alert-success{background-color:rgba(16,185,129,.2);color:#6ee7b7}[data-theme=dark] .alert-warning{background-color:rgba(245,158,11,.2);color:#fcd34d}.content-section{margin-bottom:2rem}.content-section h2{font-size:1.5rem;font-weight:700;margin-bottom:1rem;color:var(--text-primary)}.content-section h3{font-size:1.25rem;font-weight:600;margin-bottom:.75rem;color:var(--text-primary)}.content-section p{margin-bottom:1rem;color:var(--text-secondary)}.formula-box{background-color:var(--bg-tertiary);border:1px solid var(--border-light);border-radius:var(--radius-md);padding:1rem;font-family:ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,monospace;font-size:.875rem;overflow-x:auto}.chart-container{position:relative;height:300px;width:100%;background:var(--bg-primary);border-radius:var(--radius-md);padding:1rem}@media (max-width:640px){.chart-container{height:250px}}[data-theme=dark] header{background-color:var(--bg-secondary);border-color:var(--border-light)}[data-theme=dark] footer{background-color:#0a1929}[data-theme=dark] .bg-white,[data-theme=dark] .calc-card,[data-theme=dark] .feature-card{background-color:var(--bg-secondary);border-color:var(--border-light)}[data-theme=dark] .text-slate-600{color:var(--text-secondary)}[data-theme=dark] .text-slate-700{color:var(--text-secondary)}[data-theme=dark] .text-slate-800{color:var(--text-primary)}[data-theme=dark] .text-slate-500{color:var(--text-muted)}[data-theme=dark] .bg-slate-50{background-color:var(--bg-tertiary)}[data-theme=dark] .border-slate-200{border-color:var(--border-light)}[data-theme=dark] .border-slate-300{border-color:var(--border-medium)}[data-theme=dark] input[type=number],[data-theme=dark] input[type=text],[data-theme=dark] select{background-color:var(--bg-tertiary);border-color:var(--border-medium);color:var(--text-primary)}[data-theme=dark] input[type=number]::placeholder,[data-theme=dark] input[type=text]::placeholder{color:var(--text-muted)}[data-theme=dark] input[type=number]:focus,[data-theme=dark] input[type=text]:focus,[data-theme=dark] select:focus{border-color:#7da4d4;box-shadow:0 0 0 2px rgba(125,164,212,.3)}.nav-link{color:var(--text-secondary);transition:color var(--transition-fast)}.nav-link:hover{color:var(--color-primary)}[data-theme=dark] .nav-link{color:var(--text-secondary)}[data-theme=dark] .nav-link:hover{color:#f1f5f9}.nav-active{color:var(--color-primary);border-bottom:2px solid var(--color-accent);padding-bottom:.25rem}[data-theme=dark] .nav-active{color:#7da4d4}.nav-active-mobile{color:var(--color-primary)}[data-theme=dark] .nav-active-mobile{color:#7da4d4}.logo-text{color:var(--color-primary)}.logo-accent{color:var(--color-accent)}[data-theme=dark] .logo-text{color:#f1f5f9}.feature-icon-svg{color:var(--color-primary)}[data-theme=dark] .feature-icon-svg{color:#7da4d4}.sidebar-icon{color:var(--color-primary)}[data-theme=dark] .sidebar-icon{color:#7da4d4}.sidebar-icon-bg{background-color:rgba(30,58,95,.1)}[data-theme=dark] .sidebar-icon-bg{background-color:rgba(45,74,111,.3)}@media (max-width:640px){.result-value{font-size:2rem}.calc-card{padding:1rem}}*,::after,::before{transition-property:background-color,border-color,color;transition-duration:0s}.btn,.calc-card,.feature-card,.theme-toggle{transition-duration:150ms}