:root{
 --navy:#123b5d;--blue:#1f6b8f;--sky:#eaf5fa;--bg:#f4f7fa;--text:#183042;
 --muted:#667987;--line:#dce5ec;--white:#fff;--green:#246b4a;--orange:#9a5b12;--red:#a63333;
}
*{box-sizing:border-box} html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Arial,sans-serif}
.topbar{position:sticky;top:0;z-index:10;background:linear-gradient(135deg,var(--navy),var(--blue));color:#fff;box-shadow:0 2px 14px #0002}
.topbar-inner{max-width:1050px;margin:auto;padding:14px 16px;display:flex;align-items:center;justify-content:space-between}
.brand{display:flex;align-items:center;gap:12px;text-decoration:none;color:#fff}.brandmark{width:44px;height:44px;border-radius:13px;background:#fff;color:var(--navy);display:grid;place-items:center;font-weight:900}.brand h1{font-size:1.18rem;margin:0}.brand small{opacity:.8}
.nav{display:flex;gap:7px}.nav a{color:#fff;text-decoration:none;padding:9px 11px;border-radius:10px;font-size:.92rem}.nav a:hover{background:#ffffff22}
main{max-width:1050px;margin:auto;padding:22px 16px 44px}.hero{padding:10px 0 20px}.hero h2{font-size:1.45rem;margin:0 0 7px}.hero p{margin:0;color:var(--muted)}
.search{margin-top:16px;position:relative}.search input{padding-left:44px}.search:before{content:"⌕";position:absolute;left:16px;top:9px;font-size:1.5rem;color:var(--muted)}
input,select{width:100%;border:1px solid #cbd7df;border-radius:12px;background:#fff;padding:13px 14px;font-size:1rem;outline:none}input:focus,select:focus{border-color:var(--blue);box-shadow:0 0 0 3px #1f6b8f20}
.grid{display:grid;gap:14px}.grid3{grid-template-columns:repeat(3,1fr)}.grid2{grid-template-columns:repeat(2,1fr)}
.card,.panel,.toolcard{background:#fff;border:1px solid var(--line);border-radius:17px;box-shadow:0 5px 20px #1830420d}
.card{padding:22px;text-decoration:none;color:inherit;transition:.15s}.card:hover,.toolcard:hover{transform:translateY(-2px);box-shadow:0 8px 24px #18304218}.card .icon{font-size:2rem}.card h3{margin:8px 0 4px}.card p{margin:0;color:var(--muted);font-size:.92rem}
.panel{padding:20px;margin-top:18px}.panel h2{margin:0 0 14px;font-size:1.2rem}.toolcard{display:flex;flex-direction:column;gap:5px;padding:17px;text-decoration:none;color:inherit}.toolcard span{color:var(--muted);font-size:.9rem}
.badge{display:inline-block;padding:5px 9px;border-radius:999px;background:var(--sky);color:var(--blue);font-size:.78rem;font-weight:700}
.formgrid{display:grid;grid-template-columns:repeat(4,1fr);gap:12px}.field label{display:block;font-size:.86rem;font-weight:700;margin:0 0 6px}.unit{position:relative}.unit span{position:absolute;right:13px;top:13px;color:var(--muted);pointer-events:none}.unit input{padding-right:45px}
.buttonrow{display:flex;gap:10px;flex-wrap:wrap;margin-top:15px}.button{border:0;border-radius:12px;background:var(--navy);color:#fff;padding:13px 18px;font-size:1rem;font-weight:700;cursor:pointer}.button.secondary{background:#e9eef2;color:var(--text)}
.results{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin-top:16px}.result{padding:16px;border-radius:14px;background:#f7fafc;border:1px solid var(--line)}.result strong{display:block;font-size:1.1rem;margin-top:5px}.result small{color:var(--muted)}.result.low{background:#fff0f0;border-color:#e8b7b7}.result.high{background:#fff7e9;border-color:#e8cb9d}.result.normal{background:#edf8f2;border-color:#b9dcca}
.notice{padding:14px 16px;border-radius:13px;background:#fff8df;border:1px solid #efd898;margin-top:16px;font-size:.9rem}.source{font-size:.85rem;color:var(--muted);line-height:1.45}.hidden{display:none}.back{display:inline-block;text-decoration:none;color:var(--blue);margin-bottom:15px}
.pdf-list{display:grid;gap:10px}.pdf-item{display:flex;justify-content:space-between;align-items:center;padding:14px;border:1px solid var(--line);border-radius:12px;text-decoration:none;color:inherit}.pdf-item:hover{background:#f8fafc}
footer{text-align:center;color:#72838f;padding:28px 15px}
@media(max-width:780px){.nav{display:none}.grid3,.grid2,.formgrid,.results{grid-template-columns:1fr 1fr}.card{padding:18px}}
@media(max-width:520px){.grid3,.grid2,.formgrid,.results{grid-template-columns:1fr}.topbar-inner{padding-top:max(12px,env(safe-area-inset-top))}.brand small{display:none}}