*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;color:#2D3748;background:#fff;line-height:1.6;-webkit-font-smoothing:antialiased}
a{color:#2563EB;text-decoration:none}
a:hover{text-decoration:underline}
.nav{position:sticky;top:0;z-index:100;background:rgba(255,255,255,0.95);backdrop-filter:blur(8px);border-bottom:1px solid #E2E8F0}
.nav-inner{max-width:1080px;margin:0 auto;padding:0 20px;display:flex;align-items:center;justify-content:space-between;height:52px}
.nav-logo{font-size:17px;font-weight:700;color:#2D3748;letter-spacing:-0.5px}
.nav-logo span{color:#2563EB}
.nav-links{display:flex;gap:16px;align-items:center}
.nav-links a{font-size:13px;color:#4A5568;font-weight:500}
.nav-links a:hover{color:#2563EB;text-decoration:none}
.breadcrumb{max-width:1080px;margin:0 auto;padding:12px 20px;font-size:13px;color:#A0AEC0}
.breadcrumb a{color:#718096}
.container{max-width:1080px;margin:0 auto;padding:0 20px}
.layout{display:grid;grid-template-columns:1fr 320px;gap:32px;align-items:start}
.calc-card{background:#F7FAFC;border:1px solid #E2E8F0;border-radius:16px;padding:32px;margin-bottom:24px}
.calc-card h1{font-size:24px;font-weight:700;color:#1A202C;margin-bottom:6px}
.calc-subtitle{font-size:14px;color:#718096;margin-bottom:24px}
.input-group{margin-bottom:16px}
.input-group label{display:block;font-size:13px;font-weight:600;color:#4A5568;margin-bottom:6px}
.input-row{display:flex;gap:8px;align-items:center}
.input-prefix,.input-suffix{font-size:14px;color:#718096;font-weight:500;white-space:nowrap}
.input-help{display:block;font-size:11px;color:#A0AEC0;margin-top:4px;line-height:1.4}
input[type="number"],input[type="text"],select{width:100%;padding:10px 14px;border:1px solid #CBD5E0;border-radius:8px;font-size:15px;color:#2D3748;background:#fff;outline:none;transition:border-color 0.15s}
input:focus,select:focus{border-color:#2563EB;box-shadow:0 0 0 3px rgba(37,99,235,0.1)}
.btn-calc{width:100%;padding:12px;margin-top:8px;background:#2563EB;color:#fff;border:none;border-radius:8px;font-size:15px;font-weight:600;cursor:pointer;transition:background 0.15s}
.btn-calc:hover{background:#1D4ED8}
.btn-calc:active{background:#1E40AF}
.results{display:none;margin-top:20px;padding-top:20px;border-top:1px solid #E2E8F0}
.results.show{display:block}
.result-item{display:flex;justify-content:space-between;align-items:baseline;padding:10px 0;border-bottom:1px solid #EDF2F7}
.result-item:last-child{border-bottom:none}
.result-label{font-size:14px;color:#718096}
.result-value{font-size:18px;font-weight:700;color:#1A202C}
.result-highlight{background:#EBF5FF;border:1px solid #BEE3F8;border-radius:12px;padding:16px 20px;margin-top:16px;text-align:center}
.result-highlight .result-label{font-size:13px;color:#2B6CB0;margin-bottom:4px;display:block}
.result-highlight .result-value{font-size:28px;color:#2563EB}
.result-interpret{background:#FFFFF0;border:1px solid #FEFCBF;border-radius:10px;padding:14px 18px;margin-top:16px;font-size:13px;color:#744210;line-height:1.6;display:none}
.result-interpret.show{display:block}
.result-interpret strong{color:#975A16}
.action-bar{display:flex;gap:8px;margin-top:14px;justify-content:flex-end}
.action-bar button{padding:6px 14px;border:1px solid #E2E8F0;border-radius:6px;background:#fff;color:#4A5568;font-size:12px;cursor:pointer;display:flex;align-items:center;gap:4px}
.action-bar button:hover{background:#F7FAFC;border-color:#CBD5E0}
.sidebar{position:sticky;top:68px}
.related-card{background:#F7FAFC;border:1px solid #E2E8F0;border-radius:12px;padding:20px;margin-bottom:20px}
.related-card h3{font-size:15px;font-weight:600;margin-bottom:12px;color:#1A202C}
.related-link{display:block;padding:8px 0;border-bottom:1px solid #EDF2F7;font-size:13px;color:#2563EB}
.related-link:last-child{border-bottom:none}
.related-link:hover{text-decoration:none;color:#1D4ED8}
.article{margin:40px 0;line-height:1.8}
.article h2{font-size:20px;font-weight:700;color:#1A202C;margin:32px 0 12px}
.article h3{font-size:17px;font-weight:600;color:#2D3748;margin:24px 0 10px}
.article p{margin-bottom:16px;color:#4A5568}
.article ul,.article ol{margin:12px 0 16px 24px;color:#4A5568}
.article li{margin-bottom:6px}
.article table{width:100%;border-collapse:collapse;margin:16px 0}
.article th{text-align:left;padding:10px 12px;background:#F7FAFC;border:1px solid #E2E8F0;font-size:13px;font-weight:600;color:#4A5568}
.article td{padding:10px 12px;border:1px solid #E2E8F0;font-size:14px}
.blog-section{margin:32px 0;padding:24px;background:#F7FAFC;border:1px solid #E2E8F0;border-radius:12px}
.blog-section h3{font-size:17px;font-weight:600;color:#1A202C;margin-bottom:14px}
.blog-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.blog-card{display:block;padding:12px 16px;background:#fff;border:1px solid #E2E8F0;border-radius:8px;font-size:13px;color:#2563EB;font-weight:500;transition:border-color 0.15s}
.blog-card:hover{border-color:#2563EB;text-decoration:none}
.blog-card span{display:block;font-size:11px;color:#A0AEC0;font-weight:400;margin-top:2px}
.more-tools{margin:32px 0}
.more-tools h3{font-size:17px;font-weight:600;color:#1A202C;margin-bottom:14px}
.tools-grid{display:flex;flex-wrap:wrap;gap:8px}
.tool-pill{display:inline-block;padding:6px 14px;background:#F7FAFC;border:1px solid #E2E8F0;border-radius:20px;font-size:12px;color:#4A5568;transition:all 0.15s}
.tool-pill:hover{background:#EBF5FF;border-color:#BEE3F8;color:#2563EB;text-decoration:none}
.faq{margin:40px 0}
.faq h2{font-size:20px;font-weight:700;color:#1A202C;margin-bottom:16px}
.faq-item{border-bottom:1px solid #E2E8F0;padding:16px 0}
.faq-q{font-size:15px;font-weight:600;color:#2D3748;cursor:pointer;display:flex;justify-content:space-between;align-items:center}
.faq-q::after{content:"+";font-size:18px;color:#A0AEC0;transition:transform 0.2s}
.faq-item.open .faq-q::after{content:"-"}
.faq-a{font-size:14px;color:#718096;line-height:1.7;max-height:0;overflow:hidden;transition:max-height 0.3s,padding 0.3s}
.faq-item.open .faq-a{max-height:500px;padding-top:10px}
.lang-bar{display:flex;gap:6px;flex-wrap:wrap;margin:24px 0}
.lang-btn{font-size:12px;padding:4px 12px;border-radius:20px;background:#F7FAFC;border:1px solid #E2E8F0;color:#718096}
.lang-btn:hover{background:#EBF5FF;border-color:#BEE3F8;text-decoration:none}
.lang-btn.active{background:#2563EB;color:#fff;border-color:#2563EB}
.ad-container{margin:20px 0;text-align:center;min-height:100px}
.ad-container-lg{min-height:250px}
.footer{border-top:1px solid #E2E8F0;padding:24px 0;margin-top:40px}
.footer-inner{max-width:1080px;margin:0 auto;padding:0 20px;display:flex;flex-wrap:wrap;gap:16px;font-size:12px;color:#A0AEC0}
.footer-inner a{color:#718096}
@media(max-width:768px){.layout{grid-template-columns:1fr}.sidebar{position:static}.calc-card{padding:20px}.calc-card h1{font-size:20px}.result-highlight .result-value{font-size:22px}.btn-calc{padding:14px;font-size:16px}input[type="number"],select{padding:12px 14px;font-size:16px}.blog-grid{grid-template-columns:1fr}}
@media print{.nav,.sidebar,.ad-container,.ad-container-lg,.footer,.lang-bar,.action-bar,.blog-section,.more-tools{display:none!important}.layout{display:block}}