/* Alpine contours: a field guide to heating and cooling. */
:root{--rd-snow:#f5f7f3;--rd-ink:#18323b;--rd-blue:#163b49;--rd-moss:#52684c;--rd-light:#e6ecdf;--rd-line:#cbd6ce;--rd-muted:#53676a}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--rd-snow)!important;color:var(--rd-ink)!important;font-family:"Trebuchet MS",Arial,sans-serif!important;font-size:17px;line-height:1.65}a{color:inherit;text-underline-offset:5px}a:hover{color:var(--rd-moss)}img{max-width:100%;height:auto}button,input,summary{font:inherit}:focus-visible{outline:3px solid #c28828;outline-offset:5px}.rd-skip{position:absolute;left:20px;top:-100px;background:#fff;padding:12px;z-index:30}.rd-skip:focus{top:12px}.rd-header{background:var(--rd-snow);border-bottom:1px solid var(--rd-line);position:relative;z-index:10}.rd-header-inner{max-width:1376px;margin:auto;min-height:110px;display:flex;align-items:center;justify-content:space-between;gap:32px;padding:20px 40px}.rd-brand{display:flex;gap:13px;align-items:center;text-decoration:none;color:var(--rd-blue);flex-shrink:0;line-height:1.1}.rd-brand>span{font-size:24px;font-weight:800;letter-spacing:.15em}.rd-brand small{display:block;font-size:10px;font-weight:700;letter-spacing:.16em;margin-top:7px}.rd-desktop-nav{display:flex;justify-content:flex-end;gap:21px;flex-wrap:wrap}.rd-desktop-nav a{font-size:14px;text-decoration:none;font-weight:bold}.rd-desktop-nav a:hover{text-decoration:underline}.rd-mobile-nav{display:none}.rd-home h1,.rd-home h2,.rd-home h3{font-family:inherit;color:var(--rd-ink);font-weight:700;letter-spacing:-.04em}.rd-home h1{font-size:60px;line-height:1.03;margin:22px 0 26px;max-width:600px}.rd-home h2{font-size:42px;line-height:1.15;margin:14px 0 24px}.rd-home h3{font-size:25px;line-height:1.2;margin:20px 0 15px}.rd-home p{margin:0 0 20px}.rd-kicker{font-size:11px!important;font-weight:bold;letter-spacing:.17em;line-height:1.4;text-transform:uppercase;color:var(--rd-moss);margin:0 0 16px!important}.rd-hero{display:grid;grid-template-columns:1fr 1fr;max-width:1376px;margin:auto;gap:50px;padding:72px 40px 66px;align-items:center}.rd-lead{font-size:19px;line-height:1.6;max-width:490px}.rd-button{background:var(--rd-blue);color:#fff!important;text-decoration:none;padding:17px 23px;display:inline-flex;align-items:center;gap:30px;font-size:15px;font-weight:bold;border-radius:4px;transition:background .15s}.rd-button:hover{background:var(--rd-moss)}.rd-button span{font-size:23px;line-height:1}.rd-hero-note{font-size:12px;color:var(--rd-muted);margin:20px 0 0!important}.rd-terrain{margin:0;position:relative}.rd-terrain img{display:block;width:100%;border-radius:8px 80px 8px 8px}.rd-terrain figcaption{display:flex;justify-content:space-between;gap:16px;padding-top:14px;font-size:10px;letter-spacing:.1em;color:var(--rd-muted)}.rd-section{max-width:1296px;margin:auto;padding:72px 0;border-top:1px solid var(--rd-line)}.rd-section-head{max-width:670px;margin-bottom:38px}.rd-route-grid{display:grid;grid-template-columns:repeat(3,1fr);border-top:2px solid var(--rd-moss);gap:0}.rd-route-grid article{padding:28px 32px 8px 0;position:relative}.rd-route-grid article+article{border-left:1px solid var(--rd-line);padding-left:32px}.rd-step{font-size:12px;display:flex;align-items:center;justify-content:center;width:31px;height:31px;background:var(--rd-moss);color:#fff;border-radius:100%;margin-top:-45px;margin-bottom:30px;border:4px solid var(--rd-snow)}.rd-route-grid p{font-size:16px;color:var(--rd-muted)}.rd-route-grid a,.rd-text-link{font-size:14px;font-weight:bold}.rd-context{display:grid;grid-template-columns:1fr 1.2fr;gap:90px}.rd-context>div>p:not(.rd-kicker){max-width:420px}.rd-context-cards{display:grid;gap:18px}.rd-context-cards article{background:var(--rd-light);padding:30px 34px;border-radius:4px}.rd-context-cards h3{margin-top:12px}.rd-context-cards p{font-size:16px;margin-bottom:0}.rd-tag{font-size:10px;letter-spacing:.18em;font-weight:700}.rd-checklist{display:grid;grid-template-columns:1fr 1.2fr;gap:90px}.rd-checklist ol{list-style:none;counter-reset:steps;padding:0;margin:0}.rd-checklist li{counter-increment:steps;display:grid;grid-template-columns:35px 1fr;gap:0 18px;padding:20px 0;border-bottom:1px solid var(--rd-line)}.rd-checklist li:first-child{padding-top:0}.rd-checklist li:before{content:"0" counter(steps);grid-row:1/3;font-size:13px;color:var(--rd-moss);padding-top:3px}.rd-checklist strong{font-size:18px}.rd-checklist li span{font-size:15px;color:var(--rd-muted)}.rd-reading-index{display:grid;grid-template-columns:1fr 1.2fr;gap:90px}.rd-index-links a{display:block;padding:22px 0;border-bottom:1px solid var(--rd-line);text-decoration:none;font-size:20px;line-height:1.5}.rd-index-links a:first-child{padding-top:0}.rd-index-links span{display:block;font-size:11px;letter-spacing:.08em;color:var(--rd-moss);margin-bottom:8px}.rd-faq-section{display:grid;grid-template-columns:.8fr 1.2fr;gap:80px}.rd-faq{border-top:1px solid var(--rd-line)}.rd-faq:last-child{border-bottom:1px solid var(--rd-line)}.rd-faq summary{cursor:pointer;font-size:18px;font-weight:bold;padding:23px 26px 23px 0;position:relative;list-style:none;display:flex;gap:20px;line-height:1.4}.rd-faq summary::-webkit-details-marker{display:none}.rd-faq summary:after{content:"+";position:absolute;right:0;font-size:24px;font-weight:normal;top:18px}.rd-faq[open] summary:after{content:"−"}.rd-faq summary>span{font-size:11px;color:var(--rd-moss);padding-top:6px;letter-spacing:.1em}.rd-faq p{font-size:16px;color:var(--rd-muted);padding-left:35px;margin:0 0 24px}.rd-end{background:var(--rd-light);text-align:center;padding:65px 24px 75px}.rd-end h2{margin-top:10px}.rd-end p:not(.rd-kicker){max-width:540px;margin:0 auto 25px}.rd-footer{background:var(--rd-blue);color:#eef2e9;padding:52px 40px 24px}.rd-footer-inner{max-width:1296px;margin:auto;display:grid;grid-template-columns:1fr 1fr;gap:30px 65px}.rd-footer-brand{font-size:21px;font-weight:bold;text-decoration:none}.rd-footer p{font-size:13px;color:#c9d8d2;margin:8px 0}.rd-footer nav{display:flex;flex-wrap:wrap;align-content:start;gap:12px 22px}.rd-footer nav a{font-size:13px;text-decoration:none}.rd-footer a:hover{color:#fff;text-decoration:underline}.rd-colophon{grid-column:1/-1;padding-top:24px;border-top:1px solid #4a6972;font-size:11px!important;letter-spacing:.08em}
/* Internal layout: outer main owns all horizontal gutters. */
body>main.container{width:calc(100% - 80px)!important;max-width:1296px!important;padding:0!important;margin:48px auto 70px!important}main.container:has(.rd-reading){max-width:1176px!important}main.container:not(:has(.rd-reading)):not(:has(.rd-journal)){max-width:820px!important;font-size:18px;line-height:1.8}main.container:not(:has(.rd-reading)):not(:has(.rd-journal)) h1{font-size:42px;line-height:1.15;letter-spacing:-.04em}main.container h1,main.container h2,main.container h3{font-family:inherit;color:var(--rd-ink)}.rd-journal{padding:12px 0 20px}.rd-journal-head{padding-bottom:34px;border-bottom:1px solid var(--rd-line);margin-bottom:32px}.rd-journal-head h1{font-size:48px!important;line-height:1.1;letter-spacing:-.04em;margin:10px 0 18px!important}.rd-journal-order{color:var(--rd-muted);font-size:14px}.rd-story-grid{display:grid!important;grid-template-columns:repeat(3,minmax(0,1fr));gap:30px}.rd-story-card{border:1px solid var(--rd-line);border-radius:6px;overflow:hidden;background:#fff;min-width:0;display:flex;flex-direction:column}.rd-story-media{display:block;aspect-ratio:16/9;background:var(--rd-light);overflow:hidden}.rd-story-media img{display:block;width:100%;height:100%;object-fit:cover}.rd-story-media:has(img[src=""]),.rd-story-media:not(:has(img)){display:none}.rd-story-copy{padding:25px;display:flex;flex-direction:column;flex:1}.rd-story-copy time{font-size:12px;color:var(--rd-muted);display:block;line-height:1.5;overflow-wrap:anywhere}.rd-story-copy h2{font-size:23px!important;line-height:1.25;letter-spacing:-.025em;margin:15px 0}.rd-story-copy h2 a{text-decoration:none}.rd-story-copy p{font-size:15px;color:var(--rd-muted);line-height:1.7;margin-bottom:22px;overflow-wrap:anywhere}.rd-read-story{font-size:13px;font-weight:bold;margin-top:auto}.rd-pagination{display:flex;justify-content:space-between;align-items:center;gap:22px;flex-wrap:wrap;padding:40px 0 0;font-size:14px}.rd-page-numbers{display:flex;flex-wrap:wrap;gap:8px}.rd-pagination a,.rd-pagination span[aria-current]{display:inline-block;padding:7px 12px;border:1px solid var(--rd-line);border-radius:3px}.rd-pagination [aria-current]{background:var(--rd-blue);color:#fff}.container.rd-reading{width:100%!important;max-width:none!important;padding:0!important;margin:0!important}.rd-reading>.row{display:grid!important;grid-template-columns:minmax(0,780px) minmax(230px,1fr);gap:48px;margin:0!important}.rd-reading>.row>.col-lg-8,.rd-reading>.row>.col-lg-4{width:auto!important;max-width:none!important;min-width:0;flex:none!important;padding:0!important}.rd-longform{font-size:18px!important;line-height:1.8;color:var(--rd-ink);overflow-wrap:anywhere}.rd-longform>header{padding-bottom:32px;border-bottom:1px solid var(--rd-line);margin-bottom:32px}.rd-longform h1{font-size:44px!important;line-height:1.14!important;letter-spacing:-.04em;margin:14px 0 22px!important}.rd-longform time{display:block;color:var(--rd-muted);font-size:13px;line-height:1.5}.rd-longform section.mb-5 h2{font-size:29px;line-height:1.3;letter-spacing:-.025em;margin:38px 0 18px}.rd-longform section.mb-5 h3{font-size:23px;line-height:1.35;margin:30px 0 15px}.rd-longform p{margin:0 0 22px}.rd-longform li{margin-bottom:9px}.rd-longform figure{margin:30px 0}.rd-longform img{max-height:540px;object-fit:contain;border-radius:5px}.rd-longform blockquote{padding:20px 25px;background:var(--rd-light);border-left:3px solid var(--rd-moss);margin:25px 0}.rd-longform table{display:block;max-width:100%;overflow-x:auto;font-size:15px}.rd-reading .col-lg-4{padding-top:8px!important}.rd-reading .col-lg-4 h2,.rd-reading .col-lg-4 h3{font-size:21px!important;line-height:1.35}.rd-reading .col-lg-4 .card{background:#fff!important;color:var(--rd-ink)!important;border:1px solid var(--rd-line)!important;box-shadow:none!important;border-radius:4px;margin-bottom:20px}.rd-reading .col-lg-4 .card-body{padding:20px!important;color:var(--rd-ink)!important}.rd-reading .col-lg-4 .card a{color:var(--rd-ink)!important;line-height:1.4}.rd-reading .col-lg-4 .card p{color:var(--rd-muted)!important;font-size:14px!important;line-height:1.6}.rd-reading .col-lg-4 .card img{height:auto;max-height:150px;object-fit:cover}.rd-reading .col-lg-4 .card time,.rd-reading .col-lg-4 .text-muted{font-size:12px;color:var(--rd-muted)!important;line-height:1.5;overflow-wrap:anywhere}.rd-reading input,.rd-reading textarea{max-width:100%;background:#fff;color:var(--rd-ink);border:1px solid var(--rd-line);border-radius:4px;padding:10px}.rd-reading button,.rd-reading .btn-primary{background:var(--rd-blue);border-color:var(--rd-blue);color:#fff}.rd-reading [id*="comment"] h2,.rd-reading [id*="comment"] h3{font-size:22px}.rd-reading [id*="comment"] h4,.rd-reading [id*="comment"] h5{font-size:17px}
@media(min-width:1500px){.rd-hero{gap:70px}}@media(max-width:1375px){.rd-section{margin-left:40px;margin-right:40px}.rd-desktop-nav{gap:13px}.rd-desktop-nav a{font-size:13px}.rd-header-inner{gap:22px}.rd-reading>.row{gap:32px;grid-template-columns:minmax(0,780px) minmax(210px,1fr)}}
@media(max-width:1100px){.rd-desktop-nav{display:none}.rd-mobile-nav{display:block}.rd-mobile-nav summary{cursor:pointer;border:1px solid var(--rd-line);border-radius:4px;padding:9px 16px;font-size:14px;font-weight:bold}.rd-mobile-menu{position:absolute;right:40px;top:90px;width:270px;max-width:calc(100vw - 48px);padding:16px 22px;background:var(--rd-snow);border:1px solid var(--rd-line);border-radius:5px;box-shadow:0 15px 30px #163b491a;display:grid;grid-template-columns:1fr 1fr;gap:15px}.rd-mobile-menu a{font-size:14px;text-decoration:none}.rd-hero{gap:30px;padding-top:50px}.rd-home h1{font-size:49px}.rd-context,.rd-checklist,.rd-reading-index,.rd-faq-section{gap:45px}.rd-story-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.rd-reading>.row{display:block!important}.rd-reading>.row>.col-lg-8{max-width:780px!important;margin:auto}.rd-reading>.row>.col-lg-4{max-width:780px!important;margin:50px auto 0;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:20px}.rd-reading .col-lg-4>h2,.rd-reading .col-lg-4>h3{grid-column:1/-1}.rd-reading .col-lg-4 .card{margin:0}}
@media(max-width:767px){.rd-header-inner{min-height:83px;padding:16px 24px}.rd-brand>span{font-size:21px}.rd-brand svg{width:36px}.rd-mobile-menu{right:24px;top:75px}.rd-hero{display:block;padding:38px 24px 34px}.rd-home h1{font-size:38px;line-height:1.08;margin:16px 0 20px}.rd-lead{font-size:17px;line-height:1.55}.rd-button{padding:14px 18px;font-size:14px;gap:20px}.rd-terrain{margin-top:32px}.rd-terrain img{max-height:300px;object-fit:cover;border-radius:6px 55px 6px 6px}.rd-terrain figcaption{font-size:8px;gap:10px}.rd-section{margin:0 24px;padding:42px 0}.rd-home h2{font-size:32px;margin-bottom:20px}.rd-home h3{font-size:24px}.rd-section-head{margin-bottom:30px}.rd-route-grid{display:block;border-top:none}.rd-route-grid article,.rd-route-grid article+article{padding:25px 0 30px 46px;border:0;border-top:1px solid var(--rd-line)}.rd-route-grid article:last-child{padding-bottom:0}.rd-step{position:absolute;left:0;top:28px;margin:0;border:0;width:29px;height:29px}.rd-route-grid h3{margin-top:0}.rd-context,.rd-checklist,.rd-reading-index,.rd-faq-section{display:block}.rd-context-cards{margin-top:30px}.rd-context-cards article{padding:25px}.rd-checklist ol{margin-top:30px}.rd-index-links{margin-top:28px}.rd-index-links a{font-size:18px}.rd-faq summary{font-size:16px;gap:14px;padding:21px 24px 21px 0}.rd-faq p{font-size:16px;padding-left:29px}.rd-end{padding:42px 24px 50px}.rd-footer{padding:38px 24px 24px}.rd-footer-inner{display:block}.rd-footer nav{margin:25px 0 28px;gap:14px 23px}.rd-footer-brand{font-size:19px}.rd-colophon{margin-top:25px!important}body>main.container{width:calc(100% - 48px)!important;margin:32px auto 45px!important}.rd-journal-head h1{font-size:36px!important}.rd-journal-head{padding-bottom:22px;margin-bottom:24px}.rd-story-grid{grid-template-columns:minmax(0,1fr);gap:22px}.rd-story-copy{padding:23px}.rd-story-copy h2{font-size:23px!important}.rd-longform{font-size:17px!important;line-height:1.8}.rd-longform h1{font-size:34px!important;line-height:1.15!important}.rd-longform section.mb-5 h2{font-size:27px}.rd-longform section.mb-5 h3{font-size:22px}.rd-reading>.row>.col-lg-4{display:block}.rd-reading .col-lg-4 .card{margin-bottom:20px}.rd-pagination{gap:14px}.rd-pagination a,.rd-pagination span[aria-current]{padding:6px 9px}main.container:not(:has(.rd-reading)):not(:has(.rd-journal)) h1{font-size:34px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none!important}}