:root{--bg-dark:#07090F;--text-primary:#ffffff;--text-secondary:#9aa0a6;--accent:#2563eb;--accent-glow:rgba(37, 99, 235, 0.5);--font-main:'Inter', sans-serif;--border-color:rgba(255, 255, 255, 0.1)}*{box-sizing:border-box}body{font-family:var(--font-main);background-color:var(--bg-dark);color:var(--text-primary);margin:0;padding:0;line-height:1.6;overflow-x:hidden}body::before{content:"";position:fixed;top:0;left:0;width:100%;height:100%;background-image:linear-gradient(rgba(255,255,255,.03) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.03) 1px,transparent 1px);background-size:50px 50px;pointer-events:none;z-index:-1}a{color:inherit;text-decoration:none}.container{max-width:1200px;margin:0 auto;padding:0 20px}header.site-header{border-bottom:1px solid var(--border-color);background:#07090F;position:fixed;top:0;left:0;right:0;height:80px;z-index:9999;width:100%}body{padding-top:80px}.header-inner{display:flex;justify-content:space-between;align-items:center;height:80px}.logo .brand-link{display:flex;align-items:center;gap:12px;font-weight:800;font-size:1.4rem;color:#fff}.brand-icon{width:40px;height:40px;background:#1a1d2d;border-radius:8px;display:flex;align-items:center;justify-content:center;border:1px solid rgba(255,255,255,.1)}.main-nav .nav-menu{display:flex;gap:2.5rem;list-style:none;margin:0;padding:0}.main-nav a{color:var(--text-secondary);font-weight:500;font-size:.95rem;transition:color 0.2s}.main-nav a:hover,.main-nav .current-menu-item>a{color:var(--text-primary)}.header-actions{display:flex;align-items:center;gap:1.5rem}.lang-picker{background:#131620;padding:8px 16px;border-radius:20px;font-size:.9rem;display:flex;align-items:center;gap:8px;cursor:pointer;border:1px solid var(--border-color);color:var(--text-primary)}.search-trigger{background:none;border:none;color:var(--text-primary);cursor:pointer;padding:5px}.hero{text-align:center;padding:6rem 0 4rem;max-width:900px;margin:0 auto}.hero h1{font-size:4rem;font-weight:800;letter-spacing:-.02em;margin-bottom:1rem;line-height:1.1}.hero p.subtitle{font-size:1.25rem;color:var(--text-secondary);margin-bottom:3rem;max-width:700px;margin-left:auto;margin-right:auto}.search-container{position:relative;max-width:700px;margin:0 auto}.search-form{position:relative}.search-field{width:100%;background:rgba(255,255,255,.05);border:1px solid rgba(255,255,255,.1);padding:1.25rem 1.5rem 1.25rem 3.5rem;font-size:1.1rem;color:#fff;border-radius:12px;transition:all 0.3s ease;backdrop-filter:blur(10px)}.search-field:focus{outline:none;border-color:rgba(37,99,235,.5);box-shadow:0 0 30px rgba(37,99,235,.2);background:rgba(255,255,255,.08)}.search-icon-placeholder{position:absolute;left:1.25rem;top:50%;transform:translateY(-50%);color:var(--text-secondary);pointer-events:none}.search-field::placeholder{color:#64748b}.site-footer{background:#0b0e17;padding:5rem 0 2rem;margin-top:auto;border-top:1px solid var(--border-color)}.footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:3rem;margin-bottom:4rem}.footer-col h6{color:#fff;font-size:.75rem;font-weight:700;letter-spacing:.1em;margin-bottom:1.5rem;text-transform:uppercase}.footer-col ul{list-style:none;padding:0;margin:0;display:flex;flex-direction:column;gap:.8rem}.footer-col a{color:var(--text-secondary);font-size:.95rem;transition:color 0.2s}.footer-col a:hover{color:var(--accent)}.tagline{margin-top:1rem;color:#64748b;font-size:.95rem}.footer-bottom{border-top:1px solid rgba(255,255,255,.05);padding-top:2rem;display:flex;justify-content:space-between;color:#4b5563;font-size:.85rem}@media (max-width:768px){.header-inner{height:auto;padding:1rem 0;flex-direction:column;gap:1rem}.main-nav .nav-menu{gap:1rem;font-size:.9rem}.footer-grid{grid-template-columns:1fr;gap:2rem}.footer-bottom{flex-direction:column;gap:1rem;text-align:center}}.categories-section{padding:0 0 6rem}.section-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:2rem;padding:0 10px}.section-header h3{font-size:1.5rem;font-weight:700;margin:0}.view-all{color:var(--accent);font-weight:600;font-size:.95rem}.category-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(180px,1fr));gap:1rem}.cat-card{background:rgba(255,255,255,.03);border:1px solid rgba(255,255,255,.08);border-radius:12px;padding:1.25rem;display:flex;flex-direction:column;align-items:center;text-align:center;gap:.5rem;transition:all 0.3s cubic-bezier(.25,.8,.25,1);position:relative;overflow:hidden;min-height:140px}.cat-card:hover{transform:translateY(-3px);background:rgba(255,255,255,.06);border-color:rgba(255,255,255,.15);box-shadow:0 10px 20px rgba(0,0,0,.2)}.cat-icon{width:44px;height:44px;border-radius:10px;display:flex;align-items:center;justify-content:center;margin-bottom:.25rem}.cat-icon svg{width:24px;height:24px}.cat-icon.finance{background:rgba(34,197,94,.1);color:#22c55e}.cat-icon.health{background:rgba(239,68,68,.1);color:#ef4444}.cat-icon.math{background:rgba(59,130,246,.1);color:#3b82f6}.cat-icon.physics{background:rgba(168,85,247,.1);color:#a855f7}.cat-icon.chemistry{background:rgba(245,158,11,.1);color:#f59e0b}.cat-icon.everyday{background:rgba(236,72,153,.1);color:#ec4899}.cat-card h4{margin:0;font-size:1rem;font-weight:600;color:var(--text-primary);line-height:1.2}.calc-layout-grid{display:grid;grid-template-columns:400px minmax(0,1fr);gap:3rem;align-items:start;position:relative}.calc-sidebar{position:sticky;top:100px;background:rgba(255,255,255,.02);border:1px solid rgba(255,255,255,.05);border-radius:16px;padding:1rem;backdrop-filter:blur(10px);z-index:10;box-shadow:0 10px 30px rgba(0,0,0,.2)}.calc-sidebar .calc-tool-container{width:100%!important;max-width:100%!important;margin:0!important;padding:1rem!important;box-shadow:none!important;background:transparent!important}.calc-sidebar form,.calc-sidebar .calc-grid,.calc-sidebar .form-group{display:flex!important;flex-direction:column!important;grid-template-columns:1fr!important;gap:1rem!important}.calc-sidebar input,.calc-sidebar select,.calc-sidebar button{width:100%!important;max-width:100%!important}.calc-content-area{background:rgba(255,255,255,.01);border-radius:16px;padding:2rem;border:1px solid rgba(255,255,255,.03)}.calc-content-area h2{font-size:1.8rem;color:#fff;margin-top:2.5rem;margin-bottom:1rem;border-bottom:1px solid rgba(255,255,255,.1);padding-bottom:.5rem}.calc-content-area h3{font-size:1.4rem;color:var(--text-primary);margin-top:2rem}.calc-content-area p,.calc-content-area li{font-size:1.05rem;color:var(--text-secondary);margin-bottom:1rem}.engine-calc-container{background:#0f1219;border:1px solid rgba(255,255,255,.08);border-radius:16px;padding:1.5rem;box-shadow:0 20px 40px rgba(0,0,0,.4);font-family:var(--font-main)}.calc-section-title{display:flex;align-items:center;gap:10px;margin-bottom:1.5rem;color:#fff;font-size:1.1rem;font-weight:700}.calc-section-icon{width:32px;height:32px;background:rgba(37,99,235,.1);border-radius:8px;display:flex;align-items:center;justify-content:center;color:var(--accent)}.engine-form-group{margin-bottom:1.25rem}.engine-label{display:block;font-size:.75rem;text-transform:uppercase;letter-spacing:.05em;color:var(--text-secondary);margin-bottom:.5rem;font-weight:600}.engine-input,.engine-select{width:100%;background:#1a1d2d!important;border:1px solid rgba(255,255,255,.08);border-radius:10px;padding:12px 16px;font-size:1rem;color:white!important;transition:all 0.2s ease;font-family:var(--font-main)}.engine-input:-webkit-autofill,.engine-input:-webkit-autofill:hover,.engine-input:-webkit-autofill:focus,.engine-input:-webkit-autofill:active{-webkit-box-shadow:0 0 0 30px #1a1d2d inset!important;-webkit-text-fill-color:white!important;transition:background-color 5000s ease-in-out 0s}.engine-input:focus,.engine-select:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px rgba(37,99,235,.2);background:#202436!important}.engine-btn{width:100%;background:var(--accent);color:#fff;border:none;border-radius:10px;padding:14px;font-size:.95rem;font-weight:700;text-transform:uppercase;letter-spacing:.05em;cursor:pointer;transition:all 0.3s ease;margin-top:1rem;box-shadow:0 4px 15px rgba(37,99,235,.3)}.engine-btn:hover{background:#1d4ed8;transform:translateY(-2px);box-shadow:0 8px 25px rgba(37,99,235,.4)}.engine-result-card{background:#131620;border-radius:12px;padding:1.5rem;margin-top:2rem;border:1px solid rgba(255,255,255,.05)}.result-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:1.5rem}.result-badge{background:rgba(16,185,129,.1);color:#10b981;font-size:.7rem;padding:4px 8px;border-radius:4px;font-weight:700;text-transform:uppercase}.result-value-group{margin-bottom:1.5rem}.result-label{font-size:.85rem;color:var(--text-secondary);display:block;margin-bottom:.25rem}.result-value-big{font-size:2.5rem;font-weight:800;color:#fff;line-height:1.1}.result-sub{font-size:1rem;color:var(--text-secondary);font-weight:400}.engine-grid-2{display:grid;grid-template-columns:1fr 1fr;gap:1rem}.calc-section h3{margin-top:2.5rem;margin-bottom:1rem;font-size:1.4rem;color:#fff;border-left:3px solid var(--accent);padding-left:1rem}