/* Atlantic-style editorial introduction and inline Arctic explorer. */
.polar-introduction{position:relative;isolation:isolate;overflow:hidden;border-radius:12px;margin:20px 0 42px;min-height:410px;background:#edf3f6}
.polar-introduction .polar-hero{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;object-position:center 60%;margin:0;border-radius:0;z-index:-2}
.polar-introduction:after{content:"";position:absolute;inset:0;background:linear-gradient(90deg,rgba(237,243,246,.98),rgba(237,243,246,.91) 36%,rgba(237,243,246,.1) 77%);z-index:-1}
.polar-introduction .lead{padding:48px 40px;max-width:720px;margin:0}.polar-introduction h1{font-size:clamp(38px,4.5vw,62px);letter-spacing:-.05em;line-height:1.06;margin:12px 0 20px}.polar-introduction .intro{font-size:18px;line-height:1.65}.polar-introduction .caption{font-size:12px;max-width:540px}
.polar-actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:25px}.polar-actions a{padding:12px 18px;background:#1e2d67;color:#fff!important;border-radius:5px;font-size:14px;font-weight:400;line-height:1.5;text-decoration:none}.polar-actions a+ a{background:#fff;color:#1e2d67!important}
#arctic-component{margin:15px 0 48px}#arctic-component[hidden]{display:none}#polar-regions{scroll-margin-top:20px}
#explorer>.layout{margin-top:32px}#arctic-temperature{margin-top:28px}
@media(max-width:700px){.polar-introduction{min-height:0;background:transparent}.polar-introduction .polar-hero{position:static;display:block;height:210px;border-radius:10px;object-position:center 65%}.polar-introduction:after{display:none}.polar-introduction .lead{padding:25px 0 0}.polar-introduction h1{font-size:40px}.polar-introduction .intro{font-size:17px}.polar-actions a{font-size:14px}.polar-introduction{margin-bottom:32px}}
.ao-polar .polar-introduction .lead{background:transparent;box-shadow:none;border-radius:0}
.ao-polar main,.ao-polar>header,.ao-polar>footer{max-width:1440px}
#load-status{font-size:13px;color:#375361;border-top:1px solid #ccd7dd;padding-top:22px}
/* A quiet editorial navigation card, consistent with the map controls. */
.atlantic-return{display:inline-flex;align-items:center;gap:13px;min-height:60px;padding:10px 18px 10px 12px;border:1px solid #ccd7dd;border-radius:8px;background:#edf3f6;color:#1e2d67;text-decoration:none;transition:background .15s,border-color .15s,color .15s}.return-arrow{display:grid;place-items:center;width:32px;height:32px;border-radius:50%;background:#fff;font-size:21px;line-height:1}.return-kicker{display:block;font-size:9px;line-height:1.3;font-weight:650;letter-spacing:.17em;text-transform:uppercase;color:#375361}.return-title{display:block;font-size:16px;font-weight:650;line-height:1.4;letter-spacing:-.025em}.atlantic-return:hover{background:#1e2d67;border-color:#1e2d67;color:#fff}.atlantic-return:hover .return-kicker{color:#edf3f6}.atlantic-return:hover .return-arrow{background:#ffffff20}.atlantic-return:focus-visible{outline:3px solid #1e2d67;outline-offset:4px}
@media(max-width:700px){.ao-polar>header{gap:16px}.ao-polar>header #brand{min-width:0}.ao-polar>header .logo{width:150px;max-width:100%}.atlantic-return{gap:8px;min-height:50px;padding:8px 10px;white-space:nowrap}.return-arrow{width:26px;height:26px;font-size:18px}.return-title{font-size:14px}.return-kicker{font-size:8px}}
@media(prefers-reduced-motion:reduce){.atlantic-return{transition:none}}

.polar-introduction .polar-layers{font-size:12px;font-weight:600;line-height:1.6;letter-spacing:.07em;text-transform:uppercase;color:#375361;margin:18px 0 0}
@media(max-width:700px){.polar-introduction .polar-layers{font-size:10px;line-height:1.7}}

/* Arctic-only summary is slotted into the interactive map's sidebar. */
#arctic-component>#arctic-extent-summary{border:0;border-top:1px solid #ccd7dd;border-radius:0;box-shadow:none;background:#fff;margin:24px 0 0;padding:24px 0 0;color:#375361;font-family:Arial,Helvetica,sans-serif;line-height:1.6}
#arctic-extent-summary .eyebrow{font-size:10px;letter-spacing:.15em;color:#df2840;margin:0 0 7px}
#arctic-extent-summary h3{font-size:21px;letter-spacing:-.035em;color:#030208;margin:0 0 16px}
#arctic-extent-summary .reading{font-size:40px;line-height:1.15;font-weight:800;letter-spacing:-.05em;color:#030208;margin:0 0 12px}
#arctic-extent-summary .unit{display:block;font-size:15px;font-weight:400;letter-spacing:0;color:#375361;margin-top:5px}
#arctic-extent-summary #extent-date,#arctic-extent-summary #snapshot-date,#arctic-extent-summary .extent-region-note,#arctic-extent-summary .extent-source{font-size:12px;line-height:1.6;margin:12px 0}
#arctic-component>.arctic-extent-guide{display:block;margin-top:24px;padding-top:16px;border-top:1px solid #ccd7dd;font-size:14px;line-height:1.7}
.arctic-extent-guide h3{font-size:18px;color:#030208}.arctic-history-layout{display:block}
.arctic-reference{border:0;border-top:1px solid #ccd7dd;padding:0;margin:0 0 28px}
.arctic-reference>summary{padding:16px 0;color:#1e2d67;font-size:14px;font-weight:600;cursor:pointer}
.arctic-reference .arctic-reference-card{border:0;box-shadow:none;padding:12px 0 20px;max-width:680px}
.arctic-reference #satellite-view[hidden]{display:none}