*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:#fff;color:#111c20;font-family:Arial,Helvetica,sans-serif;font-size:17px;line-height:1.7}a{color:#075b8a;text-underline-offset:4px}a:hover{color:#086448}a:focus-visible{outline:3px solid #16885f;outline-offset:5px}header,.wrap,footer{max-width:1160px;margin:auto;padding:0 32px}header{display:flex;align-items:center;justify-content:space-between;gap:25px;min-height:112px;border-bottom:1px solid #dce5e6}.brand{display:flex;align-items:center;gap:12px;text-decoration:none;color:#111c20;font-weight:800;font-size:21px;line-height:1.2}.mark{display:grid;place-items:center;background:#08654d;color:white;border-radius:50%;width:43px;height:43px;font-size:18px;flex-shrink:0}.brand small{display:block;font-size:12px;font-weight:500;letter-spacing:1.4px;margin-top:7px;color:#4a6267}nav{display:flex;gap:24px;flex-wrap:wrap}nav a{text-decoration:none;font-size:15px;font-weight:700;color:#263d43}.eyebrow{text-transform:uppercase;letter-spacing:2px;font-size:12px;font-weight:800;color:#096649}.hero{display:grid;grid-template-columns:1.5fr 1fr;gap:70px;padding:66px 0 60px;align-items:center}h1{font-size:clamp(38px,5vw,64px);line-height:1.09;letter-spacing:-2px;margin:15px 0 24px}h1 em{font-style:normal;color:#087957}h2{line-height:1.25;font-size:30px;letter-spacing:-.6px;margin:38px 0 18px}h3{font-size:22px;line-height:1.3;margin:14px 0}.lead{font-size:19px;color:#43575e;max-width:660px}.button{display:inline-block;padding:13px 21px;background:#08644e;color:#fff;text-decoration:none;font-size:15px;font-weight:700;border-radius:5px}.button:hover{background:#064e3e;color:white}.button.blue{background:#085c8b}.intro-panel{border-top:4px solid #087957;padding:25px 28px;background:#f0f7f6}.intro-panel h2{margin-top:10px;font-size:25px}.steps{list-style:none;margin:20px 0 0;padding:0}.steps li{border-top:1px solid #ccdfdc;padding:13px 0;display:flex;gap:15px;font-size:16px}.steps b{color:#087957}.disclosure{background:#f2f7fb;border-left:3px solid #197aac;padding:14px 20px;font-size:14px;color:#354f5c;margin:0 0 30px}.section-head{display:flex;align-items:end;justify-content:space-between;gap:20px;border-top:1px solid #dce5e6;margin-top:25px;padding-top:32px}.section-head h2{margin:0 0 5px}.section-head p{margin:0;color:#496069;font-size:15px}.grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:25px;margin:26px 0 50px}.card{display:block;text-decoration:none;color:#111c20;border:1px solid #dbe5e8;padding:28px;border-radius:7px;transition:box-shadow .15s}.card:hover{color:#111c20;box-shadow:0 7px 25px #153e4410;border-color:#81b3aa}.card .num{font-size:14px;color:#507079;float:right}.card h3{font-size:25px;max-width:390px}.card p{font-size:16px;color:#496069}.read{color:#08654d;font-weight:700;font-size:14px}.offer{display:grid;grid-template-columns:1.5fr 1fr;gap:50px;border-top:1px solid #dce5e6;padding:35px 0 55px;align-items:center}.offer h2{margin-top:10px}.offer p{color:#43575e}.offer-action{border-left:1px solid #dce5e6;padding-left:35px;font-size:14px}.breadcrumbs{font-size:14px;margin:30px 0;color:#4c626b}.article-layout{display:grid;grid-template-columns:minmax(0,760px) 230px;gap:65px}.article-layout h1{font-size:clamp(35px,4.5vw,53px)}.article-layout article{min-width:0}.article-layout article p{margin:18px 0}.meta{font-size:14px;color:#536b72}.article-layout aside{align-self:start;position:sticky;top:25px;padding-top:15px}.aside-box{border-top:3px solid #168268;padding-top:16px}.aside-box h2{font-size:18px;margin-top:0}.aside-box a{display:block;font-size:15px;padding:12px 0;border-bottom:1px solid #dbe5e8}.article-cta{background:#edf6f4;padding:25px;margin:35px 0}.article-cta h2{font-size:24px;margin-top:0}.article-cta p{font-size:15px}.table-wrap{overflow:auto}table{border-collapse:collapse;width:100%;font-size:15px}th,td{text-align:left;padding:14px;border-bottom:1px solid #ccdce0;vertical-align:top}th{background:#edf5f8}.example{border-left:4px solid #168268;padding:15px 25px;background:#f3f8f7}.sources{font-size:14px;border-top:1px solid #dce5e6;padding-top:20px;margin:35px 0}.sources h2{font-size:20px;margin:0}.source-url{display:block;color:#4c6772;overflow-wrap:anywhere;font-size:13px}.page-narrow{max-width:780px;padding-bottom:50px}.page-narrow h1{font-size:46px}footer{border-top:1px solid #dce5e6;padding-top:30px;padding-bottom:35px;margin-top:40px;font-size:14px;color:#496069}.footer-top{display:flex;justify-content:space-between;gap:25px;flex-wrap:wrap}footer p{max-width:830px;font-size:13px}.skip{position:absolute;left:20px;top:-100px;background:white;padding:10px;z-index:2}.skip:focus{top:10px}@media(max-width:800px){header{padding:23px;display:block}nav{margin-top:25px;gap:20px}.wrap,footer{padding-left:23px;padding-right:23px}.hero{grid-template-columns:1fr;gap:25px;padding:35px 0}.hero h1{max-width:600px}.intro-panel{padding:20px}.grid{grid-template-columns:1fr;gap:16px}.section-head{display:block}.offer{grid-template-columns:1fr;gap:10px}.offer-action{border-left:0;padding-left:0}.article-layout{grid-template-columns:1fr;gap:25px}.article-layout aside{position:static}.article-layout h1{letter-spacing:-1px}.section-head p{margin-top:8px}.page-narrow h1{font-size:36px}.card{padding:23px}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}.card{transition:none}}
/* Winter battery article */
.article-heading{max-width:960px;margin:36px auto 30px;text-align:center}.article-heading h1{font-size:clamp(34px,4.2vw,53px);line-height:1.13;letter-spacing:-1.2px}.article-heading .lead{margin:0 auto;max-width:750px}.article-image{margin:32px auto;max-width:100%;text-align:center}.article-image img{display:block;width:100%;height:auto;margin:0 auto;border-radius:6px}.article-image figcaption{font-size:13px;color:#486169;line-height:1.5;margin:10px auto 0;max-width:820px}.article-hero{max-width:980px;margin-bottom:42px}.quick-answer{background:#edf6f4;border-left:4px solid #168268;padding:22px 25px;margin:28px 0}.quick-answer h2{font-size:25px;margin-top:0}.affiliate-note{font-size:15px;background:#f4f8fb;border-left:3px solid #377f9e;padding:16px 20px;margin:28px 0}.affiliate-note p{margin:0!important}.related-reading{margin-top:35px}.sources li{margin-bottom:17px;scroll-margin-top:24px}sup a{font-size:12px;margin-left:3px}.article-layout h2[id]{scroll-margin-top:24px}@media(max-width:800px){.article-heading{margin-top:25px}.article-heading h1{letter-spacing:-.6px}.article-hero{margin-bottom:28px}.quick-answer{padding:18px}.article-image{margin-top:25px}.article-layout aside{border-top:1px solid #dce5e6}}@media print{header,footer,.article-layout aside,.affiliate-note,.article-cta,.breadcrumbs{display:none}.wrap{max-width:none;padding:0}.article-layout{display:block}.article-image{max-width:600px}a{color:inherit}.article-heading h1{font-size:30px}}
/* Homepage article directory: show every published card in the sidebar. */
.home-reading-layout{display:grid;grid-template-columns:minmax(0,1fr) 280px;gap:32px;align-items:start}.home-reading-layout>section{min-width:0}.home-reading-layout .section-head{display:block}.home-reading-layout .section-head p{margin-top:9px}.home-reading-layout .card{padding:22px}.home-reading-layout .card h3{font-size:23px}.latest-posts{margin-top:25px;background:#f0f7f6;border:1px solid #d4e5df;border-top:4px solid #087957;border-radius:6px;padding:23px;position:sticky;top:24px}.latest-posts h2{font-size:23px;margin:0 0 13px}.latest-posts ul{list-style:none;padding:0;margin:0}.latest-posts li+li{border-top:1px solid #ccdfdc}.latest-posts a{display:block;padding:13px 0;color:#164e42;font-size:15px;line-height:1.5;text-decoration:none;overflow-wrap:anywhere}.latest-posts a:hover{text-decoration:underline;color:#075b8a}.shade-log th,.shade-log td{min-width:110px}.shade-log caption{text-align:left;font-weight:700;padding:12px 0}.article-cta .button{max-width:100%;white-space:normal}@media(max-width:1000px){.home-reading-layout .grid{grid-template-columns:1fr}}@media(max-width:800px){.home-reading-layout{grid-template-columns:1fr;gap:0}.latest-posts{position:static;margin:0 0 32px}.home-reading-layout .grid{margin-bottom:30px}}
/* Small Amazon book link, bottom-right in the page flow. */
.amazon-book{width:180px;max-width:100%;margin:26px 0 20px auto;text-align:center;padding:12px;border:1px solid #dce5e6;border-radius:7px;background:#f8fbfa;clear:both}
.amazon-book-label{display:block;font-size:10px;line-height:1.5;color:#496069;margin-bottom:10px}
.amazon-book a{display:block;text-decoration:none;font-size:13px;font-weight:700;line-height:1.5}
.amazon-book img{display:block;width:130px;max-width:100%;height:auto;margin:0 auto 10px;border-radius:3px}
.amazon-book a:hover span{text-decoration:underline}
.amazon-book p{font-size:11px;line-height:1.5;margin:9px 0 0;color:#496069}
@media(max-width:600px){.amazon-book{width:158px;padding:10px;margin-top:20px}.amazon-book img{width:108px}}
@media print{.amazon-book{display:none}}
/* Recommended products */
.products-page h1 em{font-style:normal;color:#087957}.products-page>.lead{max-width:800px}.product-feature{border:1px solid #d4e5df;border-top:4px solid #087957;border-radius:7px;margin:32px 0;padding:30px;scroll-margin-top:24px}.product-heading h2{margin:10px 0;font-size:clamp(26px,3vw,36px)}.product-columns{display:grid;grid-template-columns:minmax(0,0.9fr) minmax(0,1.2fr);gap:34px;margin-top:26px}.product-gallery figure{margin:0}.product-gallery img{display:block;width:100%;height:auto;border-radius:5px}.product-gallery figcaption,.product-small{font-size:13px;line-height:1.6;color:#496069}.product-gallery figcaption{margin:10px 0 18px}.product-gallery summary{cursor:pointer;color:#075b8a;padding:12px 0;font-size:15px}.product-gallery details figure{margin-top:12px}.product-description>p:first-child{margin-top:0}.amazon-product-button{display:inline-block;background:#ff9900;color:#111c20;padding:15px 24px;border:2px solid #b66d00;border-radius:4px;text-decoration:none;font-size:17px;font-weight:800;max-width:100%;text-align:center}.amazon-product-button:hover{background:#e98900;color:#111c20}.product-save{display:inline-block;margin:8px 0;font-size:15px}.product-guides{background:#edf6f4;padding:22px 25px;margin-top:28px}.product-guides h3{margin-top:0}.product-guides ul{padding-left:22px;margin-bottom:0}.product-guides li{margin:9px 0}nav a[aria-current="page"]{color:#08654d;text-decoration:underline}@media(max-width:800px){.product-columns{grid-template-columns:1fr}.product-feature{padding:20px}.product-gallery{max-width:460px;margin:auto}.products-page h1{font-size:38px;letter-spacing:-1px}}
/* Compact homepage link to our own digital bundle. */
.home-diy-bundle{display:flex;align-items:center;gap:14px;max-width:390px;margin:18px 0;padding:12px;border:1px solid #cbded6;border-radius:10px;background:#f5faf7;color:#123d30;text-decoration:none}.home-diy-bundle>img{width:76px;height:auto;flex:0 0 76px;object-fit:contain}.home-diy-bundle>span{display:grid;gap:4px;min-width:0}.home-diy-bundle small{font-size:10px;letter-spacing:.08em}.home-diy-bundle strong{font-size:16px;line-height:1.3}.home-diy-bundle span span{font-size:12px}.home-diy-bundle b{font-size:12px}.home-diy-bundle:hover{border-color:#08654d}.home-diy-bundle:focus-visible{outline:3px solid #08654d;outline-offset:4px}@media(max-width:380px){.home-diy-bundle{gap:10px}.home-diy-bundle strong{font-size:14px}}
/* Subtle Pinterest-inspired board link, shared by homepage and products. */
.pinterest-board-wrap{margin-top:14px;margin-bottom:14px}
.pinterest-board-link{display:flex;align-items:center;gap:12px;width:fit-content;max-width:100%;padding:12px 16px;border:1px solid #e60023;border-radius:14px;background:#fff7f8;color:#a9001a;text-decoration:none;box-shadow:0 2px 6px #65000f08;transition:background .15s ease,box-shadow .15s ease}
.pinterest-board-mark{display:grid;place-items:center;flex:0 0 36px;width:36px;height:36px;border-radius:50%;background:#e60023;color:white;font:bold italic 29px Georgia,serif;line-height:1}
.pinterest-board-copy{display:grid;gap:3px;min-width:0}.pinterest-board-copy strong{font-family:Arial,Helvetica,sans-serif;font-size:14px;font-weight:700;line-height:1.4}.pinterest-board-copy small{font-size:12px;color:#694047;line-height:1.4}.pinterest-board-arrow{font-size:20px;font-weight:700;flex-shrink:0}
.pinterest-board-link:hover{background:#ffedf0;box-shadow:0 3px 10px #65000f12}.pinterest-board-link:focus-visible{outline:3px solid #e60023;outline-offset:4px}.pinterest-board-sr{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
@media(max-width:480px){.pinterest-board-link{padding:10px 12px;gap:10px}.pinterest-board-copy strong{font-size:13px}.pinterest-board-copy small{font-size:11px}}
@media(prefers-reduced-motion:reduce){.pinterest-board-link{transition:none}}