:root{--primary:#209cff;--primary-dark:#0878d8;--secondary:#68e0cf;--bg-color:#209cff;--card-bg:#fff;--text-main:#0a3f6b;--text-light:#6b7280;--input-bg:#f8fafc;--input-border:#e2e8f0}*{box-sizing:border-box;-webkit-tap-highlight-color:transparent;outline:none;margin:0;padding:0}html,body{width:100%;min-height:100vh;overflow-x:hidden}body{background-color:var(--bg-color);color:var(--text-main);direction:ltr;background-image:linear-gradient(#68e0cf 0%,#209cff 100%);background-attachment:fixed;flex-direction:column;align-items:center;padding:0;font-family:Inter,sans-serif;transition:all .3s;display:flex}.main-content{flex-direction:column;flex:1;align-items:center;width:100%;max-width:1200px;padding:20px 10px;display:flex}.lang-switch{cursor:pointer;color:var(--primary);z-index:50;background:#fff;border:2px solid #0000;border-radius:20px;padding:8px 16px;font-weight:600;text-decoration:none;transition:all .3s;position:absolute;top:20px;right:20px;box-shadow:0 2px 10px #0000000d}.lang-switch:hover{background:var(--bg-color);transform:translateY(-2px);box-shadow:0 4px 12px #0000001a}header{text-align:center;flex-direction:column;align-items:center;width:100%;margin-top:20px;margin-bottom:30px;display:flex}.app-logo{object-fit:cover;border:3px solid #fff;border-radius:50%;margin-bottom:15px;box-shadow:0 4px 10px #0000001a}h1.main-title{letter-spacing:-.5px;margin-bottom:5px;font-size:2.4rem;font-weight:600;line-height:1.2}p.short-intro{color:var(--text-light);max-width:600px;margin:0 auto;font-size:1.1rem;line-height:1.6}.tool-container{grid-template-columns:1fr;gap:20px;width:100%;max-width:600px;margin-bottom:60px;display:grid}.input-card{background:var(--card-bg);border:1px solid #fff;border-radius:24px;flex-direction:column;gap:0;display:flex;position:relative;overflow:hidden;box-shadow:0 20px 40px -10px #00000014}.card-header-accent{background:linear-gradient(90deg, var(--primary), var(--secondary));width:100%;height:6px}.card-body{flex-direction:column;gap:20px;padding:30px;display:flex}.input-wrapper{position:relative}label{color:#374151;align-items:center;gap:8px;margin-bottom:8px;font-size:.95rem;font-weight:600;display:flex}input[type=number]{border:2px solid var(--input-border);background-color:var(--input-bg);width:100%;height:56px;color:var(--text-main);text-align:center;border-radius:14px;padding:0 15px;font-family:inherit;font-size:1.1rem;font-weight:600;transition:all .3s}input[type=number]:focus{border-color:var(--primary);background:#fff;outline:none}.toggle-container{background:var(--input-bg);border:2px solid var(--input-border);border-radius:14px;height:56px;padding:4px;display:flex}.toggle-btn{color:#9ca3af;cursor:pointer;background:0 0;border:none;border-radius:10px;flex:1;font-family:inherit;font-size:.95rem;font-weight:600;transition:all .2s}.toggle-btn.active{color:var(--primary);background:#fff;box-shadow:0 2px 5px #0000000d}.checkbox-wrapper{background:var(--input-bg);border:2px solid var(--input-border);cursor:pointer;border-radius:14px;justify-content:space-between;align-items:center;height:56px;padding:0 15px;transition:all .2s;display:flex}.checkbox-wrapper:hover{border-color:var(--primary);background:#fff}.checkbox-wrapper input{width:20px;height:20px;accent-color:var(--primary)}.checkbox-wrapper span{font-size:.95rem;font-weight:600}.checkbox-wrapper:has(input:disabled){opacity:.5;cursor:not-allowed;pointer-events:none;background-color:#e5e7eb}button.action-btn{letter-spacing:.5px;cursor:pointer;background:linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);color:#fff;border:none;border-radius:16px;justify-content:center;align-items:center;gap:10px;width:100%;margin-top:10px;padding:18px;font-family:inherit;font-size:1.15rem;font-weight:600;transition:transform .2s,box-shadow .2s;display:flex;box-shadow:0 10px 25px #4f46e566}button.action-btn i,button.action-btn svg{flex-shrink:0;justify-content:center;align-items:center;width:1.4em;height:1.4em;font-size:1.4em;line-height:1;display:inline-flex}button.action-btn:hover{transform:translateY(-2px);box-shadow:0 15px 30px #4f46e580}button.action-btn:active{transform:scale(.98)}.btn-green{background:linear-gradient(135deg,#10b981 0%,#059669 100%)!important;box-shadow:0 10px 25px #10b98166!important}.results-header{border-bottom:2px solid #f3f4f6;justify-content:space-between;align-items:center;margin-bottom:15px;padding-bottom:15px;display:flex}.results-title{color:var(--text-main);font-size:1.2rem;font-weight:600}.clear-text-btn{color:#ef4444;cursor:pointer;background:0 0;border:none;border-radius:8px;align-items:center;gap:5px;padding:5px 10px;font-family:inherit;font-size:.9rem;font-weight:600;transition:all .2s;display:flex}.clear-text-btn:hover{background:#fee2e2}.result-display{flex-direction:column;gap:10px;display:flex}.result-item{background:#f8fafc;border:1px solid #e5e7eb;border-radius:12px;align-items:center;padding:15px 25px;animation:.3s forwards slideDown;display:flex;position:relative}.rank-number{color:#9ca3af;background:#fff;border:1px solid #eee;border-radius:8px;flex-shrink:0;padding:5px 12px;font-size:.9rem;font-weight:600}.letter-value{text-align:center;color:var(--primary);pointer-events:none;font-size:1.5rem;font-weight:600;position:absolute;left:0;right:0}@keyframes slideDown{0%{opacity:0;transform:translateY(-10px)}to{opacity:1;transform:translateY(0)}}.range-grid{grid-template-columns:1fr 1fr;gap:15px;display:grid}.seo-section{color:#4b5563;background:#fff;border-radius:20px;width:100%;max-width:900px;margin-top:20px;padding:40px;line-height:1.8;box-shadow:0 5px 20px #00000008}.seo-section h2{color:#0a3f6b;letter-spacing:-.5px;margin-top:30px;margin-bottom:20px;font-size:1.8rem;font-weight:600}.seo-section h3{color:#0a3f6b;margin-top:25px;margin-bottom:12px;font-size:1.3rem;font-weight:600}.seo-section ul,.seo-section ol{margin-bottom:25px;padding-inline-start:25px;font-size:1.05rem}.seo-section p{margin-bottom:15px;font-size:1.05rem}.seo-section li{margin-bottom:8px}details.faq-item{background:#f9fafb;border:1px solid #e5e7eb;border-radius:12px;margin-bottom:12px;transition:all .3s;overflow:hidden}details.faq-item[open]{background:#fff;box-shadow:0 4px 15px #00000005}summary.faq-question{cursor:pointer;color:#0a3f6b;justify-content:space-between;align-items:center;padding:16px 20px;font-size:1.05rem;font-weight:600;list-style:none;display:flex;position:relative}summary.faq-question::-webkit-details-marker{display:none}summary.faq-question:after{content:"+";color:var(--primary);margin-left:15px;font-size:1.5rem;font-weight:300}details[open] summary.faq-question:after{content:"-";color:var(--secondary);font-weight:400}.faq-answer{color:#6b7280;border-top:1px solid #0000;padding:0 20px 20px;font-size:.95rem}.related-tools-container{flex-direction:column;align-items:center;width:100%;max-width:1000px;margin:40px auto 20px;display:flex}.related-title{color:var(--text-main);text-align:center;width:100%;margin-bottom:20px;font-size:1.3rem;font-weight:600}.related-grid{grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:15px;width:100%;display:grid}.related-card{background:#fff;border:2px solid #0000;border-radius:16px;align-items:center;gap:12px;height:70px;padding:15px;text-decoration:none;transition:all .2s;display:flex;box-shadow:0 4px 10px #00000008}.related-card:hover{border-color:var(--primary);transform:translateY(-3px);box-shadow:0 8px 20px #209cff1a}.related-card i{width:40px;height:40px;color:var(--primary);background:#f3f4f6;border-radius:10px;flex-shrink:0;justify-content:center;align-items:center;font-size:1.2rem;display:flex}.related-card span{color:var(--text-main);font-size:1rem;font-weight:600;line-height:1.2}footer{color:#fff;background:#1f2937;width:100%;margin-top:auto;padding:50px 5% 30px}.footer-grid{grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:30px;max-width:1000px;margin:0 auto;display:grid}.footer-brand-col{flex-direction:column;align-items:flex-start;display:flex}.footer-col h4{color:#fff;margin-bottom:15px;font-size:1.1rem;font-weight:600}.footer-links a{color:#9ca3af;margin-bottom:8px;font-size:.95rem;text-decoration:none;transition:all .2s;display:block}.footer-links a:hover{color:#fff}.footer-bottom{text-align:center;color:#6b7280;border-top:1px solid #374151;margin-top:30px;padding-top:20px;font-family:Inter,sans-serif;font-size:.85rem}@media (width<=900px){h1.main-title{font-size:2rem}.footer-grid{text-align:center;grid-template-columns:1fr;gap:35px}.footer-brand-col{align-items:center}.footer-col{flex-direction:column;align-items:center;display:flex}}@media (width<=600px){h1.main-title{font-size:1.8rem}.seo-section{padding:25px}.related-grid{grid-template-columns:1fr 1fr}.related-card{gap:8px;height:60px;padding:10px}.related-card span{font-size:.85rem}.related-card i{width:32px;height:32px;font-size:1rem}}.app-logo{box-sizing:border-box;background:radial-gradient(circle at 30% 28%,#fffffffc 0%,#f8fafff7 48%,#e0e7ffe0 100%);object-fit:contain!important;border:1px solid #fffffff0!important;border-radius:50%!important;width:124px!important;height:124px!important;margin-bottom:18px!important;padding:14px!important;box-shadow:0 18px 38px #209cff2e,0 8px 20px #0f172a14,inset 0 1px #fffc!important}footer{border-top:1px solid #ffffff14;position:relative;overflow:hidden;background:#1e1b4b!important}footer:before,footer:after{display:none}.footer-grid,.footer-bottom{z-index:1;position:relative}.footer-brand-logo{box-sizing:border-box;object-fit:contain;background:radial-gradient(circle at 30% 28%,#fffffffc 0%,#f5f7fff2 54%,#e0e7ffc7 100%);border:1px solid #fff3;border-radius:50%;width:82px;height:82px;padding:11px;box-shadow:0 16px 30px #0f172a38,inset 0 1px #ffffff7a;margin-bottom:18px!important}@media (width<=768px){.app-logo{width:84px!important;height:84px!important;margin-bottom:10px!important;padding:8px!important}.footer-brand-logo{width:74px;height:74px;padding:10px}}