:root{
  --ink:#132320;--muted:#58706a;--brand:#0e3b35;--brand-2:#165d53;--accent:#dff65a;
  --paper:#fffdf8;--soft:#f0f5f2;--line:#d9e2de;--white:#fff;--warn:#fff2c7;--danger:#ffe4df;
  --shadow:0 18px 45px rgba(18,54,48,.10);--radius:22px;--radius-sm:14px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--paper);color:var(--ink);font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;line-height:1.6}
a{color:var(--brand-2);text-underline-offset:.18em}
img{max-width:100%;height:auto}
button,input,select{font:inherit}
button{cursor:pointer}
.skip-link{position:absolute;left:-999px;top:8px;background:var(--accent);color:var(--ink);padding:10px 14px;border-radius:8px;z-index:999}
.skip-link:focus{left:8px}
.container{width:min(1180px,calc(100% - 36px));margin-inline:auto}
.narrow{max-width:830px}
.site-header{position:sticky;top:0;z-index:100;background:rgba(255,253,248,.92);backdrop-filter:blur(16px);border-bottom:1px solid rgba(217,226,222,.78)}
.header-inner{min-height:72px;display:flex;align-items:center;justify-content:space-between;gap:22px}
.brand{display:inline-flex;align-items:center;gap:10px;color:var(--ink);font-weight:800;text-decoration:none;letter-spacing:-.02em}
.brand-mark{display:grid;place-items:center;width:34px;height:34px;border-radius:10px;background:var(--brand);color:var(--accent);font-size:.93rem}
.main-nav{display:flex;gap:4px;align-items:center}
.main-nav a{padding:9px 11px;border-radius:10px;text-decoration:none;color:var(--ink);font-size:.94rem;font-weight:650}
.main-nav a:hover,.main-nav a[aria-current="page"]{background:var(--soft)}
.nav-toggle{display:none;border:1px solid var(--line);background:var(--white);padding:8px 12px;border-radius:10px}
.hero{padding:72px 0 36px;background:radial-gradient(circle at 90% 20%,rgba(223,246,90,.35),transparent 31%),linear-gradient(180deg,#f6faf6 0%,var(--paper) 100%)}
.hero-grid{display:grid;grid-template-columns:1.18fr .82fr;gap:48px;align-items:center}
.eyebrow{text-transform:uppercase;letter-spacing:.13em;font-size:.75rem;font-weight:850;color:var(--brand-2);margin:0 0 10px}
h1,h2,h3{line-height:1.12;letter-spacing:-.035em;margin-top:0}
h1{font-size:clamp(2.6rem,6vw,5.4rem);margin-bottom:20px}
.page-hero h1{font-size:clamp(2.4rem,5vw,4.4rem)}
h2{font-size:clamp(1.6rem,3vw,2.35rem);margin-bottom:14px}
h3{font-size:1.18rem}
.lead{font-size:clamp(1.08rem,2vw,1.3rem);color:#314843;max-width:760px}
.hero-points{display:flex;gap:10px;flex-wrap:wrap;margin-top:24px}
.hero-points span{background:var(--white);border:1px solid var(--line);border-radius:999px;padding:8px 12px;font-size:.9rem;font-weight:700}
.hero-visual{min-height:360px;display:grid;place-items:center;position:relative}
.screw-illustration{position:relative;width:250px;height:250px;transform:rotate(36deg)}
.screw-head{position:absolute;left:0;top:86px;width:88px;height:88px;border-radius:24px;background:var(--brand);color:var(--accent);display:grid;place-items:center;font-size:2rem;font-weight:900;box-shadow:var(--shadow)}
.screw-shank{position:absolute;left:74px;top:117px;width:135px;height:26px;background:var(--brand);border-radius:8px}
.screw-thread{position:absolute;left:95px;top:108px;width:108px;height:45px;background:repeating-linear-gradient(90deg,transparent 0 11px,var(--accent) 12px 16px,transparent 17px 22px);opacity:.9}
.screw-tip{position:absolute;left:204px;top:117px;border-left:42px solid var(--brand);border-top:13px solid transparent;border-bottom:13px solid transparent}
.material-tags{position:absolute;inset:0}
.material-tags span{position:absolute;background:var(--white);border:1px solid var(--line);padding:9px 13px;border-radius:999px;font-weight:800;box-shadow:0 8px 22px rgba(18,54,48,.08)}
.material-tags span:nth-child(1){top:18px;right:16px}.material-tags span:nth-child(2){bottom:30px;right:0}.material-tags span:nth-child(3){bottom:70px;left:4px}.material-tags span:nth-child(4){top:48px;left:8px}
.page-hero{padding:62px 0 30px;background:linear-gradient(180deg,#f2f8f4 0%,var(--paper) 100%)}
.page-hero.compact{padding-bottom:26px}
.hero-actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:24px}
.section{padding:68px 0}
.section.soft{background:var(--soft)}
.section-heading{max-width:760px;margin-bottom:28px}
.tool-layout{display:grid;grid-template-columns:minmax(0,1fr) minmax(340px,.9fr);gap:30px;align-items:start}
.tool-card,.result-card{background:var(--white);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:28px}
.tool-head{display:flex;justify-content:space-between;gap:20px;align-items:start;margin-bottom:16px}
.step-badge{background:var(--accent);padding:6px 10px;border-radius:999px;font-weight:800;font-size:.82rem}
.field{display:grid;gap:8px;margin:18px 0}
.field label,.field legend{font-weight:800}
.field small{color:var(--muted);line-height:1.45}
select,input[type="number"],input[type="text"]{width:100%;border:1px solid #bdccc6;border-radius:12px;background:#fff;padding:12px 13px;color:var(--ink);min-height:48px}
select:focus,input:focus,button:focus,a:focus{outline:3px solid rgba(22,93,83,.2);outline-offset:2px}
fieldset.field{border:0;padding:0}
.choice-row{display:flex;gap:9px;flex-wrap:wrap}
.choice-row label{border:1px solid var(--line);border-radius:10px;padding:9px 12px;background:#fff;font-weight:650}
.button{display:inline-flex;align-items:center;justify-content:center;gap:8px;border-radius:12px;padding:12px 16px;border:1px solid transparent;font-weight:850;text-decoration:none;min-height:46px}
.button.primary{background:var(--brand);color:#fff}.button.primary:hover{background:#082f2a}
.button.secondary{background:#fff;border-color:#b8c8c2;color:var(--ink)}
.button.ghost{background:transparent;border-color:#b8c8c2;color:var(--brand)}
.button.full{width:100%}
.result-card{position:sticky;top:94px;min-height:360px}
.result-empty{display:grid;place-items:start;align-content:center;min-height:300px}
.result-icon{display:grid;place-items:center;width:52px;height:52px;border-radius:15px;background:var(--accent);font-size:1.5rem;font-weight:900;margin-bottom:22px}
.result-kicker{font-weight:850;color:var(--brand-2);font-size:.82rem;text-transform:uppercase;letter-spacing:.09em}
.result-list{display:grid;gap:10px;padding:0;list-style:none}
.result-list li{padding:11px 13px;border-radius:12px;background:var(--soft)}
.result-list strong{display:block}
.warning{background:var(--warn);padding:14px 16px;border-radius:12px;margin-top:16px}
.danger{background:var(--danger);padding:14px 16px;border-radius:12px;margin-top:16px}
.share-wrap{border-top:1px solid var(--line);margin-top:22px;padding-top:18px}
.share-wrap h3{font-size:1rem;margin-bottom:10px}
.share-buttons{display:flex;gap:7px;flex-wrap:wrap}
.share-buttons a,.share-buttons button{border:1px solid var(--line);background:#fff;color:var(--ink);border-radius:9px;padding:8px 10px;font-weight:750;text-decoration:none;font-size:.88rem}
.card-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.feature-card,.guide-card{display:block;background:#fff;border:1px solid var(--line);border-radius:18px;padding:22px;text-decoration:none;color:var(--ink);transition:.18s transform,.18s box-shadow}
.feature-card:hover,.guide-card:hover{transform:translateY(-3px);box-shadow:var(--shadow)}
.feature-icon{display:grid;place-items:center;width:43px;height:43px;border-radius:12px;background:var(--accent);font-weight:900;margin-bottom:18px}
.card-link{color:var(--brand-2);font-weight:800}
.guide-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.guide-card>span{font-size:.8rem;font-weight:900;color:var(--brand-2)}
.prose-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:42px}
.prose{max-width:820px}
.prose p,.prose li{color:#344d47}
.prose.article{max-width:850px}
.prose.article section{padding:4px 0 20px}
.prose ul{padding-left:21px}
.text-link{font-weight:800}
.safety-box,.source-box,.legal-notice{background:#fff;border:1px solid var(--line);border-radius:18px;padding:24px}
.safety-box{background:#f6f9e6}
.safety-icon{display:grid;place-items:center;width:42px;height:42px;border-radius:50%;background:var(--accent);font-weight:950;margin-bottom:18px}
.source-box,.legal-notice{margin:28px 0}
.source-list li{margin-bottom:13px}
.source-note{font-size:.92rem;border-left:3px solid var(--accent);padding-left:13px}
.faq{max-width:900px}
.faq details{border-top:1px solid var(--line);padding:15px 0}
.faq details:last-child{border-bottom:1px solid var(--line)}
.faq summary{font-weight:850;cursor:pointer}
.input-suffix{position:relative}.input-suffix input{padding-right:55px}.input-suffix span{position:absolute;right:14px;top:12px;color:var(--muted);font-weight:700}
.site-footer{background:#0c2e2a;color:#deebe7;padding:52px 0 26px}
.footer-grid{display:grid;grid-template-columns:1.4fr repeat(3,1fr);gap:36px}
.site-footer h2{font-size:1rem;color:white;letter-spacing:0}
.site-footer a,.site-footer .link-button{display:block;color:#deebe7;text-decoration:none;margin:8px 0}
.site-footer .brand{color:white}.footer-brand{margin-bottom:13px!important}
.link-button{border:0;background:none;padding:0;font:inherit;cursor:pointer;text-align:left}
.footer-bottom{display:flex;justify-content:space-between;gap:20px;border-top:1px solid rgba(255,255,255,.15);padding-top:22px;margin-top:32px;font-size:.88rem}
.consent{position:fixed;inset:0;z-index:999;background:rgba(7,25,22,.52);display:grid;place-items:end center;padding:18px}
.consent[hidden]{display:none}
.consent-card{width:min(850px,100%);background:#fff;border-radius:22px;padding:24px;box-shadow:0 26px 90px rgba(0,0,0,.28)}
.consent-card h2{font-size:1.55rem}
.consent-options{display:grid;gap:9px;margin:16px 0}
.consent-options[hidden]{display:none}
.consent-row{display:flex;justify-content:space-between;gap:18px;align-items:center;border:1px solid var(--line);border-radius:12px;padding:12px}
.consent-row span{display:grid}.consent-row small{color:var(--muted)}
.consent-actions{display:flex;gap:8px;flex-wrap:wrap;margin-top:16px}
.consent-links{margin-bottom:0;font-size:.88rem}
@media(max-width:920px){
 .hero-grid,.tool-layout,.prose-grid{grid-template-columns:1fr}
 .hero-visual{min-height:260px}.result-card{position:static}
 .card-grid,.guide-grid{grid-template-columns:repeat(2,1fr)}
 .footer-grid{grid-template-columns:repeat(2,1fr)}
 .main-nav{position:absolute;display:none;top:72px;left:18px;right:18px;background:#fff;border:1px solid var(--line);border-radius:15px;padding:10px;box-shadow:var(--shadow);flex-direction:column;align-items:stretch}
 .main-nav.open{display:flex}.nav-toggle{display:block}
}
@media(max-width:560px){
 .container{width:min(100% - 24px,1180px)}
 .hero{padding-top:48px}.section{padding:48px 0}
 .hero-visual{display:none}.tool-card,.result-card{padding:20px}
 .card-grid,.guide-grid,.footer-grid{grid-template-columns:1fr}
 .footer-bottom{flex-direction:column}
 .consent-actions .button{flex:1 1 100%}
 h1{font-size:2.55rem}
}