/* Earth research feature. Scoped to this note; shared site navigation is retained. */
.earth-research { --earth-paper: #f2efe6; --earth-text: #e8e5dc; --earth-muted: #a4a7a6; --earth-panel: #121716; --earth-line: #303533; --earth-accent: #d5b56c; background: #0d1110; color: var(--earth-text); }
html:not([data-theme="dark"]) .earth-research { --earth-paper: #f2efe6; --earth-text: #252b28; --earth-muted: #616963; --earth-panel: #e8e6df; --earth-line: #cecec4; --earth-accent: #806027; background: #f2efe6; }
.earth-research main { overflow: clip; }
.earth-shell { width: min(1440px, calc(100% - clamp(2.5rem, 7vw, 8rem))); margin-inline: auto; }
.earth-opening { padding-top: 7.5rem; background: radial-gradient(ellipse at 80% 30%, rgba(55,89,85,.16), transparent 65%); }
.earth-opening-grid { display: grid; grid-template-columns: 1fr 1.18fr; align-items: center; gap: 2rem; }
.earth-intro { padding-block: 1rem 3rem; }
.earth-back { display: flex; flex-wrap: wrap; gap: .5rem 1.2rem; width: fit-content; color: var(--earth-muted); font-size: .74rem; text-decoration: none; margin-bottom: 3.2rem; }
.earth-back span { opacity: .65; }
.earth-eyebrow { display: flex; align-items: center; gap: .7rem; color: var(--earth-accent); font-size: .65rem; font-weight: 600; text-transform: uppercase; letter-spacing: .13em; }
.earth-eyebrow>span { display: block; width: 22px; height: 1px; background: currentColor; }
.earth-intro h1 { font-family: 'Anthropic Serif', Georgia, serif !important; font-size: clamp(4.7rem, 8.8vw, 8.4rem); font-weight: 400; line-height: .96; letter-spacing: -.065em; margin: 1.6rem 0 1.8rem; color: var(--earth-text) !important; }
.earth-intro h1 em { color: var(--earth-accent); font-weight: 400; }
.earth-deck { max-width: 31rem; color: var(--earth-muted); font-size: clamp(1.05rem, 1.6vw, 1.2rem); line-height: 1.7; }
.earth-actions { display: flex; align-items: center; flex-wrap: wrap; gap: 1.7rem; margin-top: 2rem; }
.earth-actions a { display: inline-flex; align-items: center; gap: 1.5rem; font-size: .8rem; color: var(--earth-text); text-decoration: none; }
.earth-actions .earth-primary { background: var(--earth-accent); color: #111713; padding: .95rem 1.2rem; border-radius: 3px; }
html:not([data-theme="dark"]) .earth-actions .earth-primary { color: #fff; }
.earth-actions a:hover { text-decoration: underline; text-underline-offset: 4px; }
.earth-opening-note { margin-top: 2.8rem; padding-left: 1rem; border-left: 1px solid var(--earth-line); max-width: 30rem; }
.earth-opening-note>span { color: var(--earth-accent); font-size: .58rem; letter-spacing: .13em; }
.earth-opening-note p { color: var(--earth-muted); font-size: .78rem; line-height: 1.75; margin: .5rem 0 0; }
.orbit-lab { min-width: 0; color: #e8e9e3; border: 1px solid #2a3734; border-radius: 8px; background: #080f12; box-shadow: 0 25px 90px rgba(0,0,0,.18); }
.orbit-topline { padding: 1.1rem 1.2rem; display: flex; justify-content: space-between; gap: 1rem; border-bottom: 1px solid #22302f; color: #8faaa7; font: 9px monospace; letter-spacing: .09em; }
.orbit-topline i { display: inline-block; width: 5px; height: 5px; background: #d5b56c; border-radius: 50%; margin-right: .35rem; box-shadow: 0 0 10px #d5b56c; }
.orbit-stage { position: relative; width: 100%; aspect-ratio: 1.06; touch-action: pan-y; cursor: grab; background: radial-gradient(ellipse at center, #13282d 0, #080f12 65%); isolation: isolate; }
.orbit-stage:active { cursor: grabbing; }
.orbit-stage canvas { position: absolute; inset: 0; width: 100%; height: 100%; pointer-events: none; }
.earth-fallback { position: absolute; inset: 20%; background: url('images/earth-surface.webp') center / cover; border-radius: 50%; box-shadow: inset -35px -15px 40px #000, 0 0 25px #338c9a66; }
.orbit-stage.has-webgl .earth-fallback { display: none; }
.orbit-corner { position: absolute; top: 1.1rem; left: 1.2rem; font: 10px/1.8 monospace; color: #95b5b8; pointer-events: none; }
.orbit-corner small { font-size: 7px; letter-spacing: .12em; }
.orbit-caption { position: absolute; bottom: .8rem; left: 1.2rem; right: 1.2rem; pointer-events: none; }
.orbit-caption>span { color: #d5b56c; font: 9px monospace; letter-spacing: .12em; }
.orbit-caption p { max-width: 340px; color: #a4b7b9; font-size: .72rem; line-height: 1.6; margin-top: .35rem; }
.orbit-toolbar { display: flex; justify-content: flex-end; align-items: center; gap: .4rem; padding: .7rem 1rem; border-top: 1px solid #22302f; }
.orbit-modes { display: flex; flex-wrap: wrap; gap: .25rem; margin-right: auto; }
.orbit-toolbar button { border: 1px solid transparent; border-radius: 3px; background: transparent; color: #a5b5b4; font: inherit; font-size: .68rem; padding: .6rem .7rem; cursor: pointer; }
.orbit-toolbar button[aria-pressed="true"] { background: #d5b56c1c; border-color: #d5b56c55; color: #e7c984; }
.orbit-toolbar button:hover { color: #fff; background: #ffffff0c; }
.orbit-footnote { padding: .7rem 1.2rem; margin: 0; border-top: 1px solid #22302f; color: #879794; font-size: .6rem; line-height: 1.6; }
.orbit-footnote a { color: #d5b56c; white-space: nowrap; }
.earth-route { display: flex; align-items: center; flex-wrap: wrap; gap: 1.7rem; margin-top: 2.5rem; padding-block: 1.4rem; border-top: 1px solid var(--earth-line); border-bottom: 1px solid var(--earth-line); }
.earth-route>span { color: var(--earth-muted); font-size: .57rem; letter-spacing: .1em; margin-right: auto; }
.earth-route a { color: var(--earth-accent); font: .65rem monospace; text-decoration: none; }
.earth-route b { margin-left: .5rem; color: var(--earth-text); font: 400 .75rem 'Anthropic Sans',sans-serif; }
.earth-reading-layout { display: grid; grid-template-columns: 230px minmax(0, 1fr); gap: clamp(2rem, 6vw, 7rem); padding-top: 5rem; }
.earth-index { position: sticky; top: 7rem; align-self: start; padding-top: .4rem; }
.earth-index>span { font-size: .6rem; color: var(--earth-muted); letter-spacing: .1em; }
.earth-index nav { display: grid; gap: 0; margin-top: 1.6rem; }
.earth-index nav a { display: flex; gap: .8rem; color: var(--earth-muted); text-decoration: none; font-size: .65rem; padding: .9rem 0; border-bottom: 1px solid var(--earth-line); }
.earth-index nav a b { font-size: .74rem; font-weight: 400; }
.earth-index nav a.is-current { color: var(--earth-accent); }
.earth-index>p { color: var(--earth-muted); font-size: .69rem; line-height: 1.85; margin-top: 1.6rem; }
.earth-chapter { max-width: 900px; padding-bottom: 5rem; margin-bottom: 4.5rem; border-bottom: 1px solid var(--earth-line); scroll-margin-top: 8rem; }
.earth-chapter-marker { display: flex; align-items: center; gap: .9rem; color: var(--earth-muted); font-size: .6rem; letter-spacing: .12em; margin-bottom: 1.7rem; }
.earth-chapter-marker>span { font: .8rem monospace; color: var(--earth-accent); border: 1px solid var(--earth-line); border-radius: 50%; padding: .65rem; }
.earth-chapter h2 { font-family: 'Anthropic Serif',Georgia,serif !important; color: var(--earth-text) !important; font-size: clamp(2.3rem, 4vw, 4rem); font-weight: 400; line-height: 1.08; letter-spacing: -.045em; margin: 0 0 1.7rem; }
.earth-chapter h3 { font-family: 'Anthropic Serif',Georgia,serif !important; font-weight: 400; font-size: 1.65rem; line-height: 1.2; margin: 2.1rem 0 1rem; color: var(--earth-text) !important; }
.earth-chapter p { max-width: 720px; font-size: .99rem; line-height: 1.9; color: var(--earth-muted); margin: 1.15rem 0; }
.earth-chapter .earth-lead { font-size: 1.2rem; line-height: 1.75; color: var(--earth-text); }
.earth-chapter p strong { color: var(--earth-text); font-weight: 500; }
.earth-chapter a { color: var(--earth-accent); text-underline-offset: 4px; }
.earth-chapter a[href^="#source-"] { font: .65rem monospace; white-space: nowrap; }
.earth-statement { padding: 2.2rem; border-left: 2px solid var(--earth-accent); background: var(--earth-panel); margin-block: 2.3rem; }
.earth-statement>span, .earth-margin-note>span, .earth-conversation>span { font-size: .59rem; letter-spacing: .14em; color: var(--earth-accent); }
.earth-statement p { font: 400 clamp(1.6rem, 2.5vw, 2.2rem)/1.35 'Anthropic Serif',Georgia,serif; color: var(--earth-text); margin: .9rem 0 0; }
.earth-margin-note { display: grid; grid-template-columns: 130px 1fr; gap: 1rem; align-items: baseline; border-block: 1px solid var(--earth-line); padding-block: 1.2rem; margin-block: 2rem; }
.earth-margin-note p { margin: 0; font-size: 1.05rem; color: var(--earth-text); }
.earth-gps-diagram { display: flex; align-items: center; justify-content: space-between; gap: 1rem; padding: 2.5rem 2rem; border: 1px solid var(--earth-line); background: var(--earth-panel); border-radius: 6px; margin-block: 2.5rem; }
.earth-gps-diagram>div { flex: 1; text-align: center; }
.earth-diagram-symbol { display: block; color: var(--earth-accent); font-size: 2.4rem; margin-bottom: 1.5rem; }
.earth-diagram-arrow { color: var(--earth-muted); }
.earth-gps-diagram small { display: block; color: var(--earth-muted); font-size: .55rem; letter-spacing: .1em; margin-bottom: .7rem; }
.earth-gps-diagram strong { font-weight: 400; font-size: .78rem; line-height: 1.5; }
.earth-location-dot { color: #77b8d2; }
.earth-process article { padding: 1.5rem 0; border-bottom: 1px solid var(--earth-line); }
.earth-process article>span, .earth-small-label { color: var(--earth-accent); font-size: .59rem; letter-spacing: .1em; }
.earth-process article h3 { margin-top: .7rem; font-size: 1.4rem; }
.earth-process article p { margin-bottom: 0; }
.earth-number-band { display: flex; flex-wrap: wrap; align-items: center; gap: 1rem 2rem; padding-block: 2.5rem; }
.earth-number-band>strong { font: 400 clamp(2.8rem, 5vw, 4rem) 'Anthropic Serif',Georgia,serif; color: var(--earth-accent); letter-spacing: -.05em; }
.earth-number-band>strong span { font: .9rem 'Anthropic Sans',sans-serif; letter-spacing: 0; }
.earth-number-band p { font-size: .78rem; line-height: 1.7; }
.earth-everyday>article { display: grid; grid-template-columns: 210px 1fr; align-items: start; gap: 1.8rem; border-top: 1px solid var(--earth-line); padding-block: 2rem; }
.earth-everyday h3 { margin-top: .75rem; font-size: 1.5rem; }
.earth-everyday p { font-size: .9rem; line-height: 1.8; }
.earth-text-link { font-size: .73rem; text-decoration: none; }
.earth-example-art { position: relative; aspect-ratio: 1; overflow: hidden; display: grid; place-items: center; border: 1px solid #293d3c; background: #0a171b; border-radius: 5px; }
.earth-example-art i { position: absolute; bottom: 1rem; color: #819b99; font: 7px monospace; letter-spacing: .1em; }
.earth-map-art { background: repeating-linear-gradient(25deg, transparent 0 28px, #55736d22 29px 30px), repeating-linear-gradient(115deg, #0a171b 0 42px, #55736d22 43px 44px); }
.earth-map-art span { width: 95px; height: 95px; border-radius: 50%; background: #6dc7ee14; border: 1px solid #6dc7ee44; box-shadow: 0 0 40px #6dc7ee1a; }
.earth-map-art b { position: absolute; font-size: 2.2rem; color: #83ccef; font-weight: 400; }
.earth-mini-globe>div { width: 72%; aspect-ratio: 1; border-radius: 50%; background: url('images/earth-surface.webp') 65% center / cover; box-shadow: inset -30px -8px 25px #020608, 0 0 18px #3c9dbb44; }
.earth-dish-art svg { width: 85%; fill: #d5b56c11; stroke: #d5b56c; stroke-width: 1.3; }
.earth-dish-art .earth-radio { fill: none; stroke: #81aaa8; stroke-dasharray: 3 4; }
.earth-conversation { padding: 2rem 0 2rem 1.7rem; border-left: 2px solid var(--earth-accent); margin-block: 2rem; }
.earth-conversation blockquote { font: 400 clamp(1.6rem, 2.6vw, 2.25rem)/1.4 'Anthropic Serif',Georgia,serif; margin: .8rem 0 0; color: var(--earth-text); }
.earth-faq { border-bottom: 1px solid var(--earth-line); padding: 1.3rem 0; }
.earth-faq summary { cursor: pointer; font-size: .92rem; line-height: 1.6; color: var(--earth-text); }
.earth-faq p { font-size: .9rem; }
.earth-sources { border-bottom: 0; margin-bottom: 0; }
.earth-sources ol { padding: 0; list-style: none; counter-reset: source; margin-block: 2rem; }
.earth-sources li { counter-increment: source; display: flex; gap: 1rem; padding: 1.2rem 0; border-top: 1px solid var(--earth-line); scroll-margin-top: 8rem; }
.earth-sources li:before { content: '0' counter(source); font: .7rem monospace; color: var(--earth-accent); padding-top: .1rem; }
.earth-sources li a { text-decoration: none; font-size: .8rem; color: var(--earth-muted); }
.earth-sources li a span { display: block; margin-bottom: .45rem; font-size: .85rem; color: var(--earth-text); }
.earth-chapter .earth-model-credit { font-size: .74rem; line-height: 1.85; }
.earth-return { display: inline-block; margin-top: 2rem; font-size: .8rem; }
.earth-research main :focus-visible { outline: 2px solid var(--earth-accent); outline-offset: 5px; }
@media(min-width:1600px) { .earth-opening-grid { gap: 4rem; } }
@media(max-width:1100px) { .earth-opening-grid { gap: 1.5rem; } .earth-intro h1 { font-size: clamp(4rem, 9vw, 6.7rem); } .earth-index { display: none; } .earth-reading-layout { display: block; max-width: 940px; } .earth-chapter { max-width: none; } .earth-opening-note { margin-top: 1.8rem; } .orbit-topline { font-size: 7px; } }
@media(max-width:760px) { .earth-opening { padding-top: 6rem; } .earth-opening-grid { grid-template-columns: 1fr; gap: .5rem; } .earth-back { margin-bottom: 2rem; } .earth-intro { padding-bottom: 2rem; } .earth-intro h1 { font-size: clamp(4.6rem, 18vw, 7rem); } .earth-deck { max-width: 36rem; } .earth-opening-note { display: none; } .earth-route { gap: 1rem; margin-top: 2rem; } .earth-route>span { width: 100%; } .earth-route b { font-size: .67rem; } .earth-route a { font-size: .55rem; } .earth-reading-layout { padding-top: 3rem; } .earth-chapter { padding-bottom: 3rem; margin-bottom: 3rem; scroll-margin-top: 6rem; } .earth-chapter h2 { font-size: clamp(2.2rem, 7vw, 3rem); } .earth-chapter h2 br { display: none; } .earth-chapter .earth-lead { font-size: 1.08rem; } .earth-statement { padding: 1.5rem; } .earth-margin-note { grid-template-columns: 1fr; gap: .7rem; } .earth-everyday>article { grid-template-columns: 140px 1fr; gap: 1.3rem; } .earth-gps-diagram { gap: .5rem; padding: 1.6rem .8rem; } .earth-gps-diagram strong { font-size: .67rem; } .earth-gps-diagram small { font-size: .45rem; } }
@media(max-width:480px) { .earth-everyday>article { grid-template-columns: 1fr; } .earth-example-art { aspect-ratio: 1.8; } .earth-mini-globe>div { width: 36%; } .earth-dish-art svg { width: 50%; } .earth-example-art i { bottom: .5rem; } .earth-eyebrow { font-size: .52rem; } .orbit-toolbar { padding: .65rem .5rem; gap: .15rem; } .orbit-toolbar button { padding: .55rem .5rem; font-size: .6rem; } .orbit-topline { font-size: 6px; padding-inline: .8rem; } .orbit-caption { left: .8rem; } .orbit-caption p { font-size: .63rem; } .earth-actions { gap: 1rem; } .earth-actions a { font-size: .73rem; } }
@media(prefers-reduced-motion:reduce) { .earth-research { scroll-behavior: auto; } }
/* Reading copy and instrument labels use the site's companion sans face. */
.earth-research main p, .earth-research main a, .earth-research main button,
.earth-research main span, .earth-research main small, .earth-research main summary,
.earth-research .earth-eyebrow, .earth-research .earth-chapter-marker { font-family: 'Anthropic Sans', sans-serif !important; }
.earth-research .earth-statement p { font-family: 'Anthropic Serif', Georgia, serif !important; }
/* Shared theme rules also color all headings/paragraphs; keep this feature's palette legible. */
.earth-research main h1, .earth-research main h2, .earth-research main h3 { color: var(--earth-text) !important; }
.earth-research main p { color: var(--earth-muted) !important; }
.earth-research main .earth-lead, .earth-research .earth-statement p, .earth-research .earth-margin-note p { color: var(--earth-text) !important; }
.earth-research .orbit-caption p { color: #a4b7b9 !important; }
.earth-research .orbit-footnote { color: #879794 !important; }