:root{--brand:#0e7c66;--brand-dark:#0a5c4c;--brand-deep:#0b3d33;--brand-soft:#e6f4f0;--accent:#f5a524;--accent-soft:#fff4dc;--ink:#12211d;--muted:#5b6b66;--line:#dde7e3;--bg:#f6faf8;--card:#ffffff;--radius:16px;--shadow:0 1px 2px rgba(11,61,51,0.06),0 8px 28px rgba(11,61,51,0.08);--font:ui-sans-serif,system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif}*{box-sizing:border-box}html{-webkit-text-size-adjust:100%}body{margin:0;font-family:var(--font);color:var(--ink);background:var(--bg);line-height:1.65;font-size:17px}img{max-width:100%;height:auto}a{color:var(--brand-dark)}a:hover{color:var(--brand)}h1,h2,h3,h4{line-height:1.2;letter-spacing:-.01em;color:var(--brand-deep)}h1{font-size:clamp(1.9rem,4.5vw,2.8rem);margin:0 0 .5rem}h2{font-size:clamp(1.4rem,3vw,1.85rem);margin:2.2rem 0 .8rem}h3{font-size:1.2rem;margin:1.6rem 0 .5rem}.wrap{max-width:1120px;margin:0 auto;padding:0 16px}.narrow{max-width:780px}.sr-only{width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0)}.skip,.sr-only{position:absolute}.skip{left:-999px;top:8px;background:#fff;padding:8px 12px;z-index:99}.skip:focus{left:8px}:focus-visible{outline:3px solid var(--accent);outline-offset:2px}.site-header{background:#fff;border-bottom:1px solid var(--line);position:-webkit-sticky;position:sticky;top:0;z-index:20}.header-row{display:flex;align-items:center;justify-content:space-between;height:66px}.site-header a{text-decoration:none}.logo{display:inline-flex;align-items:center;gap:10px}.logo-text{display:flex;flex-direction:column;line-height:1}.logo-text b{font-size:1.45rem;color:var(--brand-deep);letter-spacing:-.02em}.logo-text small{font-size:.68rem;text-transform:uppercase;letter-spacing:.14em;color:var(--brand);margin-top:3px}.nav{display:flex;gap:4px}.nav a{color:var(--ink);padding:8px 12px;border-radius:10px;font-weight:500;font-size:.96rem}.nav a.active,.nav a:hover{background:var(--brand-soft);color:var(--brand-dark)}.menu-btn{display:none;background:none;border:1px solid var(--line);border-radius:10px;width:42px;height:42px;font-size:1.2rem;cursor:pointer;color:var(--brand-deep)}@media (max-width:820px){.menu-btn{display:block}.nav{display:none;position:absolute;top:66px;left:0;right:0;background:#fff;flex-direction:column;padding:8px 16px 16px;border-bottom:1px solid var(--line)}.nav.open{display:flex}.nav a{padding:12px}}.hero{background:linear-gradient(160deg,var(--brand-deep) 0,var(--brand) 100%);padding:40px 0 120px}.hero,.hero h1{color:#fff}.hero p{color:#d6efe8;max-width:640px;margin:0;font-size:1.08rem}.hero-badges{display:flex;flex-wrap:wrap;gap:8px;margin-top:16px}.hero-badges span{background:rgba(255,255,255,.12);border:1px solid rgba(255,255,255,.2);padding:4px 12px;border-radius:999px;font-size:.85rem}.calc-wrap{margin-top:-96px}.calc{background:var(--card);border-radius:22px;box-shadow:var(--shadow);padding:20px;border:1px solid var(--line)}.calc-tabs{display:flex;gap:6px;background:var(--bg);padding:5px;border-radius:12px;overflow-x:auto}.calc-tabs button{flex:1 1;white-space:nowrap;border:0;background:transparent;padding:10px 14px;border-radius:9px;font:inherit;font-size:.93rem;font-weight:600;color:var(--muted);cursor:pointer}.calc-tabs button.on{background:#fff;color:var(--brand-dark);box-shadow:0 1px 4px rgba(0,0,0,.08)}.calc-currency{display:flex;justify-content:flex-end;align-items:center;gap:8px;margin:14px 0 4px;font-size:.9rem;color:var(--muted)}.calc-currency select{width:auto;padding:6px 10px;font-size:.9rem}.calc-grid{display:grid;grid-template-columns:1.15fr 1fr;grid-gap:22px;gap:22px;margin-top:8px}.calc-table{grid-column:1/-1}@media (max-width:860px){.calc-grid{grid-template-columns:1fr}}.field{display:flex;flex-direction:column;gap:6px;margin-bottom:16px}.field>span{font-weight:600;font-size:.93rem;color:var(--brand-deep);display:flex;justify-content:space-between}.pct-read{color:var(--brand);font-size:1.05rem}input,select{font:inherit;width:100%;padding:12px 14px;border:1.5px solid var(--line);border-radius:12px;background:#fff;color:var(--ink)}input:focus,select:focus{border-color:var(--brand);outline:none;box-shadow:0 0 0 3px rgba(14,124,102,.15)}.calc-inputs .field:first-child input{font-size:1.6rem;font-weight:700;color:var(--brand-deep)}.chips{display:grid;grid-template-columns:repeat(5,1fr);grid-gap:6px;gap:6px}.chip{border:1.5px solid var(--line);background:#fff;border-radius:12px;padding:8px 4px;cursor:pointer;font:inherit;display:flex;flex-direction:column;align-items:center;color:var(--ink)}.chip b{font-size:1.05rem}.chip small{font-size:.7rem;color:var(--muted)}.chip.on{border-color:var(--brand);background:var(--brand-soft)}.chip.on b{color:var(--brand-dark)}.slider-row{display:flex;align-items:center;gap:10px;margin-top:8px}.slider-row input[type=range]{flex:1 1;accent-color:var(--brand);padding:0;border:0}.slider-row .mini{width:72px;text-align:center;padding:8px}.unit{color:var(--muted)}.stepper{display:flex;align-items:center;border:1.5px solid var(--line);border-radius:12px;overflow:hidden}.stepper button{width:52px;height:48px;border:0;background:var(--bg);font-size:1.4rem;cursor:pointer;color:var(--brand-dark)}.stepper button:hover{background:var(--brand-soft)}.stepper output{flex:1 1;text-align:center;font-weight:600}.check{display:flex;align-items:center;gap:10px;margin-bottom:14px;cursor:pointer;font-size:.95rem}.check input{width:18px;height:18px;accent-color:var(--brand)}.calc-results{background:var(--brand-deep);color:#fff;border-radius:18px;padding:22px;display:flex;flex-direction:column;gap:16px;align-self:start}.res-main{display:grid;grid-template-columns:1fr 1fr;grid-gap:12px;gap:12px}.res-main.single{grid-template-columns:1fr}.res-main>div{background:rgba(255,255,255,.08);border-radius:14px;padding:14px}.res-main small,.res-split small{display:block;color:#a9d6cb;font-size:.82rem;text-transform:uppercase;letter-spacing:.06em}.res-main strong{font-size:clamp(1.6rem,4vw,2.2rem);color:var(--accent);font-feature-settings:"tnum";font-variant-numeric:tabular-nums}.calc-simple .res-main>div{background:var(--brand-deep)}.res-split{display:grid;grid-template-columns:1fr 1fr;grid-gap:12px;gap:12px;border-top:1px solid rgba(255,255,255,.15);padding-top:14px}.res-split b{font-size:1.3rem;font-feature-settings:"tnum";font-variant-numeric:tabular-nums}.res-notes{margin:0;padding-left:18px;color:#cfe9e2;font-size:.9rem}.res-actions{display:flex;gap:8px;flex-wrap:wrap}.btn-ghost{background:transparent;color:#fff;border:1px solid rgba(255,255,255,.35);padding:8px 14px;border-radius:10px;cursor:pointer;font:inherit;font-size:.88rem}.btn-ghost:hover{background:rgba(255,255,255,.1)}.calc-table h3{margin-top:4px;font-size:1.05rem}.calc-table table tbody tr{cursor:pointer}.calc-table tr.hl td{background:var(--accent-soft);font-weight:700}.calc-simple{max-width:480px;margin:10px auto 0}.calc-simple .res-main strong{color:var(--accent)}.hint{margin-top:0}.formula,.hint{color:var(--muted)}.formula{font-size:.88rem;text-align:center}table{width:100%;border-collapse:collapse;font-size:.95rem;background:#fff;border-radius:12px;overflow:hidden}td,th{padding:10px 12px;text-align:left;border-bottom:1px solid var(--line);vertical-align:top}th{background:var(--brand-soft);color:var(--brand-deep);font-weight:700}.table-scroll{overflow-x:auto;border:1px solid var(--line);border-radius:12px}.content{padding:24px 0 48px}.prose li,.prose p{color:#24332f}.prose ol,.prose ul{padding-left:22px}.prose li{margin-bottom:6px}.callout,.prose blockquote{background:var(--accent-soft);border-left:4px solid var(--accent);margin:1.4rem 0;padding:14px 18px;border-radius:0 12px 12px 0}.formula-box,.prose code{background:var(--brand-soft);padding:2px 6px;border-radius:6px;font-size:.95em}.formula-box{display:block;padding:14px 18px;margin:1rem 0;font-weight:600;color:var(--brand-deep);border-radius:12px}.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));grid-gap:18px;gap:18px}.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;text-decoration:none;color:var(--ink);display:flex;flex-direction:column;transition:transform .15s,box-shadow .15s}.card:hover{transform:translateY(-2px);box-shadow:var(--shadow);color:var(--ink)}.card-img{position:relative;aspect-ratio:16/9;background:var(--brand-soft)}.card-img img{object-fit:cover}.card-body{padding:16px 18px 20px}.card-body h3{margin:0 0 6px;font-size:1.12rem}.card-body p{margin:0;color:var(--muted);font-size:.94rem}.meta{color:var(--muted);font-size:.88rem}.steps{counter-reset:s;list-style:none;padding:0;display:grid;grid-gap:12px;gap:12px}.steps li{counter-increment:s;background:#fff;border:1px solid var(--line);border-radius:14px;padding:14px 16px 14px 60px;position:relative}.steps li:before{content:counter(s);position:absolute;left:16px;top:14px;width:30px;height:30px;border-radius:50%;background:var(--brand);color:#fff;display:grid;place-items:center;font-weight:700}.faq details{background:#fff;border:1px solid var(--line);border-radius:12px;padding:14px 18px;margin-bottom:10px}.faq summary{cursor:pointer;font-weight:600;color:var(--brand-deep)}.faq details p{margin:10px 0 0}.article-hero{position:relative;aspect-ratio:16/8;border-radius:18px;overflow:hidden;margin:18px 0 6px;background:var(--brand-soft)}.article-hero img{object-fit:cover}.credit{font-size:.8rem;color:var(--muted);margin:0 0 18px}.breadcrumb{font-size:.88rem;margin:18px 0 8px}.breadcrumb,.breadcrumb a{color:var(--muted)}.page-head{background:linear-gradient(160deg,var(--brand-deep),var(--brand));color:#fff;padding:36px 0}.page-head h1{color:#fff}.page-head p{color:#d6efe8;margin:0;max-width:680px}.cta{background:var(--brand-soft);border:1px solid #c6e4db;border-radius:16px;padding:18px 20px;margin:2rem 0;display:flex;gap:14px;align-items:center;justify-content:space-between;flex-wrap:wrap}.btn{background:var(--brand);color:#fff;border:0;border-radius:12px;padding:12px 20px;font:inherit;font-weight:600;cursor:pointer;text-decoration:none;display:inline-block}.btn:hover{background:var(--brand-dark);color:#fff}.btn:disabled{opacity:.6;cursor:wait}.form{background:#fff;border:1px solid var(--line);border-radius:18px;padding:22px}.form textarea{font:inherit;width:100%;min-height:160px;padding:12px 14px;border:1.5px solid var(--line);border-radius:12px;resize:vertical}.form textarea:focus{border-color:var(--brand);outline:none}.hp{position:absolute;left:-5000px}.alert{padding:12px 16px;border-radius:12px;margin-bottom:14px}.alert.ok{background:var(--brand-soft);color:var(--brand-deep)}.alert.err{background:#fdecec;color:#8a1c1c}.two-col{display:grid;grid-template-columns:1.4fr 1fr;grid-gap:28px;gap:28px}@media (max-width:820px){.two-col{grid-template-columns:1fr}}.ad-slot{margin:28px 0;padding-top:6px;border-top:1px solid var(--line);min-height:100px}.ad-label{display:block;font-size:.72rem;text-transform:uppercase;letter-spacing:.1em;color:#8a9893;margin-bottom:4px}.site-footer{background:var(--brand-deep);color:#cfe3dd;margin-top:40px;padding:40px 0 20px;font-size:.93rem}.footer-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;grid-gap:24px;gap:24px}@media (max-width:760px){.footer-grid{grid-template-columns:1fr 1fr}}.footer-grid h4{color:#fff;margin:0 0 10px;font-size:.95rem}.footer-grid a{display:block;color:#cfe3dd;text-decoration:none;margin-bottom:6px}.footer-grid a:hover{color:var(--accent)}.footer-brand{display:flex;align-items:center;gap:8px;color:#fff;font-size:1.3rem;margin-bottom:8px}.footer-bottom{border-top:1px solid rgba(255,255,255,.12);margin-top:26px;padding-top:16px;font-size:.84rem;color:#9fc2b8}