:root{--ink:#17231d;--muted:#657169;--cream:#f5f3ea;--paper:#fffefa;--line:#dcded4;--green:#1f6b4f;--green2:#2d8b67;--mint:#dceee5;--orange:#e98445;--blue:#5aa2aa;--shadow:0 20px 60px rgba(36,53,43,.08)}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--cream);color:var(--ink);font-family:Arial,Helvetica,sans-serif;line-height:1.5}button,input,select{font:inherit}a{color:inherit}.topbar{height:72px;display:flex;align-items:center;justify-content:space-between;max-width:1180px;margin:auto;padding:0 24px;border-bottom:1px solid rgba(23,35,29,.12)}.brand{display:flex;align-items:center;gap:11px;color:var(--ink);font-size:20px;font-weight:800;text-decoration:none}.brand-mark{display:grid;place-items:center;width:44px;height:44px;border-radius:13px;background:var(--green);color:#fff;font-size:13px;letter-spacing:-.5px}.topbar nav{display:flex;gap:28px}.topbar nav a,.footer-links a{color:var(--muted);text-decoration:none;font-size:14px}.topbar nav a:hover,.footer-links a:hover{color:var(--green)}
.intro{max-width:1180px;margin:0 auto;padding:64px 24px 44px;display:grid;grid-template-columns:1.4fr .6fr;align-items:end;gap:40px}.eyebrow{margin:0 0 14px;color:var(--green);font-size:12px;font-weight:800;letter-spacing:.16em;text-transform:uppercase}.intro h1{font-size:64px;line-height:.98;letter-spacing:-.055em;margin:0 0 24px;max-width:760px}.lead{color:var(--muted);font-size:19px;line-height:1.55;max-width:680px;margin:0}.formula-card{background:var(--ink);color:#fff;border-radius:28px;padding:30px 26px 24px;display:grid;grid-template-columns:1fr auto 1fr auto 1fr;align-items:center;gap:10px;box-shadow:0 18px 50px rgba(23,35,29,.14)}.formula-card span,.formula-card strong{font-size:35px;text-align:center}.formula-card span{background:rgba(255,255,255,.1);border-radius:14px;padding:17px 9px}.formula-card i{font-style:normal;color:#9fb3a8}.formula-card strong{color:#8de0b7}.formula-card small{grid-column:1/-1;text-align:center;color:#aebbb4;margin-top:8px}
.calculator-shell{max-width:1180px;margin:0 auto 80px;display:grid;grid-template-columns:minmax(0,1.65fr) minmax(330px,.8fr);background:var(--paper);border:1px solid var(--line);border-radius:30px;overflow:hidden;box-shadow:var(--shadow)}.calculator-main{padding:38px 40px 42px}.section-heading{display:flex;gap:15px;align-items:center;margin-bottom:18px}.section-heading.next{margin-top:38px}.step{display:grid;place-items:center;min-width:31px;height:31px;border-radius:10px;background:var(--mint);color:var(--green);font-size:14px;font-weight:800}.section-heading h2{font-size:20px;margin:0 0 3px}.section-heading p{font-size:13px;color:var(--muted);margin:0}.category-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:8px}.category{min-height:76px;padding:10px 7px;border:1px solid var(--line);background:#fff;border-radius:14px;color:var(--ink);font-size:12px;font-weight:700;cursor:pointer;transition:.2s}.category span{display:block;font-size:23px;color:var(--green);margin-bottom:7px}.category:hover{border-color:#8ab39f}.category.active{background:var(--mint);border-color:var(--green);box-shadow:inset 0 0 0 1px var(--green)}.mode-tabs{display:grid;grid-template-columns:repeat(3,1fr);gap:9px}.mode-tabs button{border:1px solid var(--line);background:#fff;border-radius:14px;text-align:left;padding:14px 15px;cursor:pointer;color:var(--ink)}.mode-tabs strong{display:block;font-size:19px;margin-bottom:5px}.mode-tabs small{display:block;color:var(--muted);line-height:1.3}.mode-tabs button.active{border-color:var(--green);background:#f0f8f4;box-shadow:inset 0 0 0 1px var(--green)}.input-row{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-top:22px}.field-label{display:block;font-size:13px;font-weight:700;margin-bottom:8px}.input-wrap{height:58px;border:1px solid #cfd4cd;background:#fff;border-radius:13px;display:flex;align-items:center;padding:0 16px;gap:6px}.input-wrap:focus-within{outline:3px solid rgba(45,139,103,.12);border-color:var(--green)}.input-wrap input{width:100%;min-width:0;border:0;outline:0;font-size:22px;font-weight:750;color:var(--ink);background:transparent}.input-wrap b{font-size:20px;color:var(--muted)}.input-wrap select{border:0;background:#eef2ed;border-radius:8px;padding:8px;outline:0}.quick-row{display:flex;align-items:center;gap:6px;flex-wrap:wrap;margin-top:13px}.quick-row>span{font-size:12px;color:var(--muted);margin-right:3px}#quick-values{display:flex;gap:6px;flex-wrap:wrap}.quick-row button{border:1px solid var(--line);background:#fff;border-radius:8px;padding:6px 9px;font-size:12px;cursor:pointer}.quick-row button.active{background:var(--ink);border-color:var(--ink);color:#fff}
.result-card{background:var(--ink);color:#fff;padding:40px 34px;display:flex;flex-direction:column}.result-label{color:#9db1a6;font-size:12px;text-transform:uppercase;letter-spacing:.12em;font-weight:700;margin:0 0 10px}.result-card h2{font-size:25px;letter-spacing:-.02em;margin:0 0 34px}.result-part{border-top:1px solid rgba(255,255,255,.13);padding:19px 0}.result-part span{display:flex;align-items:center;gap:9px;color:#b5c2bb;font-size:13px}.result-part i{width:10px;height:10px;border-radius:50%;display:block}.concentrate i{background:var(--orange)}.water i{background:var(--blue)}.result-part strong{display:block;font-size:35px;margin-top:7px;letter-spacing:-.03em}.result-plus{margin:-12px 0 -12px auto;width:26px;height:26px;border-radius:50%;display:grid;place-items:center;background:#34433b;color:#bac6c0;z-index:1}.visual-ratio{height:9px;display:flex;gap:3px;margin:13px 0 24px}.visual-ratio span{background:var(--orange);min-width:7px;border-radius:99px}.visual-ratio i{background:var(--blue);flex:1;border-radius:99px}.copy-button{height:49px;border:0;border-radius:12px;background:#8de0b7;color:#133426;font-weight:800;cursor:pointer;font-size:14px}.copy-button:hover{background:#a4e9c7}.context-hint{font-size:12px;color:#9eb0a6;line-height:1.55;margin:20px 0 0}.context-hint strong{color:#d9e6df}.error-message{display:none;margin:14px 0 0;padding:10px 12px;border-radius:9px;background:#fff1e8;color:#a04116;font-size:13px}.error-message.visible{display:block}
.explain,.guides,.use-cases,.faq,.safety,.site-footer{max-width:1180px;margin-left:auto;margin-right:auto}.explain{padding:0 24px 80px}.section-title{display:flex;align-items:end;justify-content:space-between;gap:40px}.section-title>p{max-width:420px;color:var(--muted);font-size:14px;line-height:1.55;margin-bottom:29px}.explain h2,.guides h2,.use-cases h2,.faq h2{font-size:38px;letter-spacing:-.04em;margin:0 0 28px}.explain-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}.explain-grid article{background:var(--paper);border:1px solid var(--line);border-radius:19px;padding:25px}.explain-grid strong{font-size:17px}.explain-grid p{color:var(--muted);font-size:14px;line-height:1.55;min-height:66px}.explain-grid em{font-style:normal;color:var(--green);font-weight:800;font-size:13px}.guides{padding:70px 24px 78px;border-top:1px solid var(--line)}.guide-links{display:grid;grid-template-columns:repeat(4,1fr);gap:10px}.guide-links a{display:grid;grid-template-columns:1fr auto;gap:5px;background:var(--paper);border:1px solid var(--line);border-radius:15px;padding:18px;text-decoration:none;color:var(--ink);transition:.2s}.guide-links a:hover{border-color:var(--green);transform:translateY(-2px)}.guide-links span{font-size:21px;font-weight:800}.guide-links small{grid-column:1;color:var(--muted)}.guide-links b{grid-column:2;grid-row:1/3;align-self:center;color:var(--green);font-size:20px}.use-cases{padding:0 24px 78px}.use-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}.use-grid a{display:flex;gap:15px;padding:21px;background:#e9eee8;border-radius:16px;text-decoration:none;color:var(--ink);transition:.2s}.use-grid a:hover{background:#dce8df;transform:translateY(-2px)}.use-grid a>span{display:grid;place-items:center;flex:0 0 42px;height:42px;background:#fff;border-radius:12px;color:var(--green);font-size:20px}.use-grid h3{font-size:15px;margin:2px 0 6px}.use-grid p{font-size:12px;line-height:1.45;color:var(--muted);margin:0}.faq{padding:0 24px 74px}.faq>div{border-top:1px solid var(--line)}.faq details{border-bottom:1px solid var(--line);padding:18px 2px}.faq summary{cursor:pointer;font-weight:750;font-size:16px}.faq details p{color:var(--muted);line-height:1.6;max-width:800px;margin:12px 0 2px}.safety{margin-bottom:66px;padding:22px 25px;border-left:4px solid var(--orange);background:#fff3e8;border-radius:0 14px 14px 0;display:flex;gap:18px}.safety strong{color:#9b4b1f}.safety p{margin:0;color:#6e584b;font-size:13px;line-height:1.5}.site-footer{border-top:1px solid var(--line);padding:34px 24px 46px;display:flex;align-items:center;gap:25px}.site-footer>p{color:var(--muted);font-size:13px;margin-right:auto}.footer-links{display:flex;gap:22px}
.article-page{max-width:920px;margin:0 auto;padding:54px 24px 82px;min-height:70vh}.article-page.narrow{max-width:760px}.breadcrumbs{font-size:12px;color:var(--muted);margin:0 0 38px}.breadcrumbs a{color:var(--green)}.article-page h1{font-size:50px;line-height:1.06;letter-spacing:-.045em;margin:0 0 22px}.article-lead{font-size:19px;line-height:1.62;color:var(--muted);max-width:790px;margin:0 0 26px}.primary-link{display:inline-flex;background:var(--green);color:#fff;text-decoration:none;font-size:14px;font-weight:800;padding:14px 19px;border-radius:12px}.article-section{margin-top:50px}.article-section h2{font-size:29px;line-height:1.2;letter-spacing:-.03em;margin:0 0 19px}.article-section h3{font-size:20px;margin:30px 0 10px}.article-section p,.body-copy{color:#4f5e56;font-size:16px;line-height:1.75}.article-section ul,.article-section ol{padding-left:23px;color:#4f5e56;line-height:1.75}.article-section li+li{margin-top:7px}.example-grid{display:grid;grid-template-columns:1fr 1fr;gap:10px}.example-grid div{background:var(--paper);border:1px solid var(--line);border-radius:13px;padding:17px;color:#33453b}.note-box{margin-top:38px;background:#fff3e8;border-left:4px solid var(--orange);border-radius:0 14px 14px 0;padding:21px 23px}.note-box strong{color:#93451a}.note-box p{color:#6f594b;line-height:1.6;margin:8px 0 0}.table-wrap{overflow:auto;border:1px solid var(--line);border-radius:16px;background:var(--paper)}table{width:100%;border-collapse:collapse;min-width:560px}th,td{text-align:left;padding:15px 18px;border-bottom:1px solid var(--line)}th{font-size:12px;text-transform:uppercase;letter-spacing:.06em;color:var(--muted);background:#eff1eb}td{font-size:15px}tbody tr:last-child td{border-bottom:0}td:nth-child(2){font-weight:800;color:var(--green)}.related{margin-top:54px;padding-top:32px;border-top:1px solid var(--line)}.related h2{font-size:24px;margin:0 0 16px}.related-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}.related-grid a{background:var(--paper);border:1px solid var(--line);border-radius:13px;padding:15px;text-decoration:none;font-size:13px;font-weight:700}.related-grid a:hover{border-color:var(--green)}.mini-calc{margin-top:50px;background:var(--paper);border:1px solid var(--line);border-radius:22px;padding:25px;box-shadow:var(--shadow)}.mini-calc h2{margin:0 0 8px}.mini-calc p{color:var(--muted);margin:0 0 18px}.mini-calc-row{display:grid;grid-template-columns:repeat(3,minmax(0,1fr)) auto;gap:10px}.mini-calc label{font-size:12px;font-weight:700}.mini-calc input,.mini-calc select{width:100%;height:45px;margin-top:6px;border:1px solid var(--line);border-radius:10px;padding:0 11px;background:#fff}.mini-calc button{align-self:end;height:45px;border:0;border-radius:10px;background:var(--green);color:#fff;padding:0 18px;font-weight:800;cursor:pointer}.mini-result{display:none;margin-top:17px;padding:14px;border-radius:11px;background:var(--mint);font-weight:700}.mini-result.visible{display:block}.monetization-slot{display:none}
@media(max-width:900px){.intro{grid-template-columns:1fr}.formula-card{display:none}.intro h1{font-size:52px}.calculator-shell{margin-left:14px;margin-right:14px;grid-template-columns:1fr}.category-grid{grid-template-columns:repeat(3,1fr)}.guide-links{grid-template-columns:repeat(2,1fr)}.use-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:620px){html{scroll-behavior:auto}.topbar{height:62px;padding:0 15px}.brand-mark{width:38px;height:38px}.topbar nav{display:none}.intro{padding:40px 17px 28px}.intro h1{font-size:40px}.lead{font-size:16px}.calculator-shell{border-radius:20px;margin-bottom:58px}.calculator-main{padding:27px 18px 30px}.category-grid{grid-template-columns:repeat(2,1fr)}.category:last-child{grid-column:1/-1}.mode-tabs{grid-template-columns:1fr}.mode-tabs button{display:grid;grid-template-columns:65px 1fr;align-items:center}.mode-tabs strong{margin:0}.input-row{grid-template-columns:1fr}.result-card{padding:31px 22px}.explain,.guides,.use-cases,.faq{padding-left:17px;padding-right:17px}.explain h2,.guides h2,.use-cases h2,.faq h2{font-size:30px}.explain-grid,.use-grid{grid-template-columns:1fr}.explain-grid p{min-height:0}.section-title{display:block}.guide-links{grid-template-columns:1fr 1fr}.safety{margin:0 17px 48px;display:block}.safety strong{display:block;margin-bottom:8px}.site-footer{margin:0 17px;align-items:flex-start;flex-wrap:wrap}.site-footer>p{width:100%;order:3}.quick-row>span{width:100%}.article-page{padding:38px 17px 62px}.article-page h1{font-size:37px}.article-lead{font-size:16px}.example-grid,.related-grid{grid-template-columns:1fr}.breadcrumbs{margin-bottom:28px}.mini-calc-row{grid-template-columns:1fr}.mini-calc button{margin-top:4px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}.guide-links a,.use-grid a{transition:none}}