:root,[data-theme=dark]{--bg-dark:#0f172a;--bg-surface:#1e293b;--bg-surface-hover:#334155;--text-primary:#f8fafc;--text-secondary:#94a3b8;--accent-primary:#38bdf8;--accent-secondary:#818cf8;--accent-gradient:linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));--navbar-bg:#0f172acc;--danger:#ef4444;--success:#10b981;--border-color:#ffffff1a;--form-bg:#0f172a;--result-bg:linear-gradient(145deg, var(--bg-surface), #151e32);--detail-row-border:#ffffff0d;--card-shadow:0 10px 15px -3px #00000080, 0 4px 6px -2px #0000004d;--font-sans:"Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;--max-width:1200px;--spacing-sm:.5rem;--spacing-md:1rem;--spacing-lg:2rem;--spacing-xl:4rem}[data-theme=light]{--bg-dark:#f1f5f9;--bg-surface:#fff;--bg-surface-hover:#f8fafc;--text-primary:#0f172a;--text-secondary:#475569;--accent-primary:#0ea5e9;--accent-secondary:#6366f1;--navbar-bg:#ffffffe6;--danger:#dc2626;--success:#059669;--border-color:#0000001a;--form-bg:#fff;--result-bg:linear-gradient(145deg, var(--bg-surface), #f8fafc);--detail-row-border:#0000000d;--card-shadow:0 10px 15px -3px #0000001a, 0 4px 6px -2px #0000000d}*{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:smooth}body{font-family:var(--font-sans);background-color:var(--bg-dark);color:var(--text-primary);-webkit-font-smoothing:antialiased;line-height:1.6}a{color:var(--accent-primary);text-decoration:none;transition:color .3s}a:hover{color:var(--accent-secondary)}img{max-width:100%;height:auto}.container{width:100%;max-width:var(--max-width);padding:0 var(--spacing-lg);margin:0 auto}.text-gradient{background:var(--accent-gradient);-webkit-text-fill-color:transparent;-webkit-background-clip:text;background-clip:text}h1,h2,h3,h4{margin-bottom:var(--spacing-sm);font-weight:700;line-height:1.2}.navbar{background:var(--navbar-bg);-webkit-backdrop-filter:blur(12px);border-bottom:1px solid var(--border-color);z-index:100;padding:1rem 0;position:sticky;top:0}.navbar-content{justify-content:space-between;align-items:center;display:flex}.logo{color:var(--text-primary);align-items:center;font-size:1.5rem;font-weight:800;display:flex}.nav-links{gap:2rem;display:flex}.nav-links a{color:var(--text-secondary);font-weight:500}.nav-links a:hover{color:var(--text-primary)}.btn{cursor:pointer;text-align:center;border:none;border-radius:.5rem;padding:.75rem 1.5rem;font-weight:600;transition:all .3s;display:inline-block}.btn-primary{background:var(--accent-gradient);color:#fff;box-shadow:0 4px 14px #38bdf863}.btn-primary:hover{color:#fff;transform:translateY(-2px);box-shadow:0 6px 20px #38bdf880}.hero{text-align:center;justify-content:center;align-items:center;padding:6rem 0;display:flex;position:relative;overflow:hidden}.hero-content{z-index:2;max-width:800px;position:relative}.hero-title{margin-bottom:var(--spacing-md);letter-spacing:-.02em;font-size:clamp(2.5rem,5vw,4.5rem)}.hero-subtitle{color:var(--text-secondary);margin-bottom:var(--spacing-lg);max-width:600px;margin-left:auto;margin-right:auto;font-size:1.25rem}.hero-bg-glow{z-index:1;pointer-events:none;background:radial-gradient(circle,#38bdf826 0%,#0f172a00 70%);width:60vw;height:60vw;position:absolute;top:50%;left:50%;transform:translate(-50%,-50%)}.calculators-section{padding:var(--spacing-xl) 0}.section-header{text-align:center;margin-bottom:var(--spacing-xl)}.section-header h2{font-size:2.5rem}.section-header p{color:var(--text-secondary);font-size:1.1rem}.calculator-grid{grid-template-columns:repeat(auto-fill,minmax(320px,1fr));gap:2rem;display:grid}.calc-card{background:var(--bg-surface);border:1px solid var(--border-color);border-radius:1rem;padding:2rem;transition:all .3s cubic-bezier(.4,0,.2,1);display:block;position:relative;overflow:hidden}.calc-card:hover{background:var(--bg-surface-hover);border-color:var(--accent-primary);transform:translateY(-5px);box-shadow:0 10px 30px -10px #38bdf833}.card-icon{background:var(--border-color);border-radius:.75rem;margin-bottom:1.5rem;padding:1rem;font-size:2.5rem;display:inline-block}.calc-card h3{color:var(--text-primary);margin-bottom:.5rem;font-size:1.25rem}.calc-card p{color:var(--text-secondary);font-size:.95rem}.footer{border-top:1px solid var(--border-color);background:var(--bg-surface);margin-top:4rem;padding:4rem 0 2rem}.footer-content{grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:2rem;margin-bottom:3rem;display:grid}.footer-desc{color:var(--text-secondary);margin-top:1rem}.footer-col h4{margin-bottom:1.5rem}.footer-links{list-style:none}.footer-links li{margin-bottom:.75rem}.footer-links a{color:var(--text-secondary)}.footer-links a:hover{color:var(--accent-primary)}.footer-bottom{text-align:center;color:var(--text-secondary);border-top:1px solid var(--border-color);padding-top:2rem}.calc-page-hero{text-align:center;padding:4rem 0 2rem}.calc-page-title{font-size:2.5rem}.calc-page-desc{color:var(--text-secondary);max-width:600px;margin:0 auto}.calc-layout{grid-template-columns:1fr 1fr;align-items:start;gap:3rem;margin-top:2rem;display:grid}.calc-input-panel{background:var(--bg-surface);border:1px solid var(--border-color);border-radius:1rem;padding:2rem}.calc-result-panel{background:var(--result-bg);border:1px solid var(--border-color);border-radius:1rem;padding:2rem;position:sticky;top:5rem}.form-group{margin-bottom:1.5rem}.form-group label{color:var(--text-primary);margin-bottom:.5rem;font-weight:500;display:block}.input-wrapper{align-items:center;display:flex;position:relative}.input-prefix{color:var(--text-secondary);pointer-events:none;position:absolute;left:1rem}.input-suffix{color:var(--text-secondary);pointer-events:none;position:absolute;right:1rem}.form-control{background:var(--form-bg);border:1px solid var(--border-color);width:100%;color:var(--text-primary);font-family:var(--font-sans);border-radius:.5rem;padding:.75rem 1rem;font-size:1rem;transition:border-color .2s,box-shadow .2s}.input-with-prefix{padding-left:2rem}.input-with-suffix{padding-right:2rem}.form-control:focus{border-color:var(--accent-primary);outline:none;box-shadow:0 0 0 3px #38bdf81a}.form-help{color:var(--text-secondary);margin-top:.4rem;font-size:.85rem;display:block}.result-box{text-align:center;margin-bottom:2rem}.result-label{color:var(--text-secondary);text-transform:uppercase;letter-spacing:.05em;margin-bottom:.5rem;font-size:1.1rem}.result-value{color:var(--accent-primary);font-size:3.5rem;font-weight:800;line-height:1.1}.result-details{background:#0003;border-radius:.5rem;padding:1.5rem}.detail-row{border-bottom:1px solid var(--detail-row-border);justify-content:space-between;padding:.5rem 0;display:flex}.detail-row:last-child{border-bottom:none}.detail-label{color:var(--text-secondary)}.detail-value{font-weight:600}@media (width<=768px){.calc-layout{grid-template-columns:1fr}.calc-result-panel{margin-top:2rem;position:static}.mobile-menu-btn{color:var(--text-primary);cursor:pointer;background:0 0;border:none;padding:.5rem;font-size:1.8rem;display:block}.nav-links{background:var(--bg-surface);border-top:1px solid var(--border-color);z-index:1000;border-top-left-radius:1.5rem;border-top-right-radius:1.5rem;flex-direction:column;align-items:center;gap:1.5rem;padding:2rem 2rem 3rem;transition:transform .3s cubic-bezier(.4,0,.2,1);position:fixed;bottom:0;left:0;right:0;transform:translateY(100%);box-shadow:0 -10px 40px #000c}.nav-links.active{transform:translateY(0)}.nav-links a{text-align:center;border-bottom:1px solid var(--border-color);width:100%;padding:.5rem 0;font-size:1.25rem}.nav-links a:last-of-type{border-bottom:none}.menu-overlay{backdrop-filter:blur(4px);z-index:999;opacity:0;pointer-events:none;background:#0009;transition:opacity .3s;position:fixed;inset:0}.menu-overlay.active{opacity:1;pointer-events:auto}}@media (width>=769px){.mobile-menu-btn,.menu-overlay{display:none}}