:root{--bg:#f6f7f9;--card:#fff;--text:#12161c;--muted:#667085;--line:#e5e7eb;--soft:#f0f2f5;--accent:#111827;--max:1160px}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--text);font:15px/1.65 -apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",Arial,sans-serif}
a{color:inherit;text-decoration:none}
button,input,textarea,select{font:inherit}
button{cursor:pointer}
.wrap{max-width:var(--max);margin:auto;padding:0 20px}
header{padding:24px 0 8px}
.top{display:flex;justify-content:space-between;gap:16px;align-items:center}
.brand{font-weight:850;font-size:21px;letter-spacing:-.4px}
.langs{display:flex;gap:6px;flex-wrap:wrap}
.langs a{font-size:12px;background:#fff;border:1px solid var(--line);border-radius:8px;padding:5px 8px}
.langs a[aria-current="page"]{font-weight:800;border-color:#9ca3af}
.hero{padding:62px 0 34px}
.eyebrow{font-size:12px;color:var(--muted);font-weight:750;text-transform:uppercase;letter-spacing:.08em;margin-bottom:10px}
.hero h1{font-size:48px;line-height:1.08;letter-spacing:-2px;margin:0 0 13px;max-width:820px}
.hero-lead{font-size:17px;max-width:820px;color:var(--muted);margin:0}
.search{margin:24px 0 12px;display:flex}
.search input{width:100%;padding:15px 16px;border:1px solid var(--line);border-radius:13px;background:#fff;box-shadow:0 4px 18px rgba(17,24,39,.04);outline:none}
.search input:focus{border-color:#9ca3af;box-shadow:0 0 0 3px rgba(156,163,175,.15)}
.stats{display:flex;flex-wrap:wrap;gap:8px;color:var(--muted);font-size:12px}
.stats span{background:var(--soft);border-radius:999px;padding:6px 9px}
.section-title{margin:28px 0 14px;font-size:22px;letter-spacing:-.4px}
.grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
.featured-grid{padding-bottom:14px}
.toolcard{display:flex;flex-direction:column;min-height:182px;padding:17px;background:#fff;border:1px solid var(--line);border-radius:16px;transition:transform .16s ease,box-shadow .16s ease,border-color .16s ease}
.toolcard:hover{transform:translateY(-2px);box-shadow:0 10px 30px rgba(17,24,39,.06);border-color:#d1d5db}
.toolcard[hidden]{display:none}
.icon{font-size:11px;font-weight:850;background:var(--soft);border-radius:8px;padding:5px 7px;width:max-content;margin-bottom:14px}
.toolcard h3{font-size:17px;line-height:1.3;margin:0 0 7px}
.toolcard p{font-size:13px;color:var(--muted);margin:0 0 12px}
.use{margin-top:auto;font-size:13px;font-weight:750}
.category-nav{display:flex;flex-wrap:wrap;gap:8px;margin:22px 0 28px;position:sticky;top:0;padding:10px 0;background:linear-gradient(var(--bg),rgba(246,247,249,.92));backdrop-filter:blur(8px);z-index:2}
.category-chip{border:1px solid var(--line);background:#fff;color:var(--text);border-radius:999px;padding:8px 12px;font-size:13px}
.category-chip.active{background:var(--accent);color:#fff;border-color:var(--accent)}
.category-section{margin-bottom:38px;scroll-margin-top:70px}
.category-section[hidden]{display:none}
.section-heading{display:flex;align-items:center;justify-content:space-between;margin:0 0 14px}
.section-heading h2{font-size:22px;margin:0;letter-spacing:-.4px}
.section-heading span{font-size:12px;color:var(--muted);background:var(--soft);border-radius:999px;padding:5px 8px}
.no-results{text-align:center;color:var(--muted);padding:50px 0}
.tool-page{max-width:900px;margin:24px auto 70px}
.static-page{max-width:900px;margin:24px auto 70px}
.back{display:inline-block;font-size:13px;color:var(--muted);margin:12px 0}
.breadcrumbs{display:flex;gap:8px;align-items:center;font-size:12px;color:var(--muted);margin:8px 0}
.breadcrumbs a{text-decoration:underline;text-underline-offset:3px}
.tool-page h1,.static-page h1{font-size:42px;line-height:1.15;letter-spacing:-1.5px;margin:14px 0 10px}
.lead{font-size:16px;color:var(--muted);margin-bottom:24px}
.toolbox,.content-card{background:#fff;border:1px solid var(--line);border-radius:18px;padding:22px}
.toolbox{margin-bottom:22px}
.form-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-bottom:14px}
.field{font-size:12px;color:var(--muted)}
.field span{display:block;margin-bottom:6px}
.field input,.field select,.toolbox>input,.toolbox textarea,.password{width:100%;padding:11px 12px;border:1px solid var(--line);border-radius:10px;background:#fff;color:var(--text);font:inherit}
.toolbox textarea{min-height:250px;resize:vertical}
.toolbox button{border:0;border-radius:10px;background:var(--accent);color:#fff;padding:11px 15px;font-weight:750}
.secondary{background:var(--soft)!important;color:var(--text)!important;border:1px solid var(--line)!important}
.output{background:var(--soft);border-radius:10px;padding:13px;margin-top:12px;min-height:45px;overflow:auto}
.output strong{font-size:20px}
.actions{display:flex;gap:8px;margin-top:10px}
.actions button{flex:1}
.download{display:inline-block;margin-top:12px;font-weight:750}
.hint{font-size:12px;color:var(--muted)}
.content-card{line-height:1.8}
.content-card h2{margin-top:0}
.faq{margin-top:26px}
.faq details{background:#fff;border:1px solid var(--line);border-radius:10px;padding:12px 14px;margin-top:8px}
.faq summary{cursor:pointer;font-weight:700}
.footer{border-top:1px solid var(--line);padding:24px 0 50px;color:var(--muted);font-size:12px}
.footer-inner{display:flex;gap:14px;align-items:center;flex-wrap:wrap}
.footer-inner strong{color:var(--text)}
.footer-inner nav{display:flex;gap:12px}
.footer-inner a:hover{text-decoration:underline;text-underline-offset:3px}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
[dir="rtl"] .top{direction:rtl}
[dir="rtl"] .category-nav{direction:rtl}
@media(max-width:920px){.grid{grid-template-columns:repeat(2,1fr)}.hero h1,.tool-page h1,.static-page h1{font-size:37px}.form-grid{grid-template-columns:1fr 1fr}}
@media(max-width:620px){.top{flex-direction:column;align-items:flex-start}.langs{width:100%;overflow-x:auto;flex-wrap:nowrap;padding-bottom:2px;scrollbar-width:thin}.langs a{flex:0 0 auto}.grid{grid-template-columns:1fr}.hero{padding-top:40px}.hero h1,.tool-page h1,.static-page h1{font-size:31px}.form-grid{grid-template-columns:1fr}.category-nav{position:static}.footer-inner{align-items:flex-start;flex-direction:column}}\n@media(max-width:620px){[dir="rtl"] .top{align-items:flex-end}.langs{direction:ltr}}

.bmi-result{display:grid;gap:14px}.bmi-result-main{display:flex;align-items:center;gap:16px}.bmi-number{font-size:44px;font-weight:850;letter-spacing:-1.5px;line-height:1}.bmi-category{font-size:17px;font-weight:800}.result-note{padding:11px 13px;border:1px solid var(--line);border-radius:10px;background:#fff;color:var(--muted)}.result-section{padding-top:12px;border-top:1px solid var(--line)}.result-section h3{font-size:15px;margin:0 0 6px}.result-section p{margin:6px 0}.result-list{margin:6px 0 0;padding-left:20px}.tool-guidance{margin-top:22px}.tool-guidance h2{margin-top:0}.tool-sources{margin:6px 0 0;padding-left:20px}.tool-sources a{text-decoration:underline;text-underline-offset:2px}
@media(max-width:720px){.bmi-result-main{align-items:flex-start}.bmi-number{font-size:38px}.form-grid{grid-template-columns:1fr 1fr}}

button:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible,a:focus-visible{outline:3px solid #2563eb;outline-offset:2px}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}.toolcard{transition:none}}

.tool-runtime{display:flex;align-items:baseline;gap:8px;margin:14px 0;padding:10px 12px;border:1px solid var(--line);border-radius:10px;background:var(--soft);font-size:13px}.tool-runtime strong{white-space:nowrap}.tool-runtime span{color:var(--muted)}.tool-runtime-network{background:var(--soft)}
.download{display:inline-flex;align-items:center;gap:6px;margin-top:10px}.pdfDownloads{display:grid;gap:8px;margin-top:12px}.pdfDownloads .download{margin-top:0}.bmi-result-main{flex-wrap:wrap}
@media(max-width:720px){.tool-runtime{align-items:flex-start;flex-direction:column;gap:3px}.tool-runtime strong{white-space:normal}}