/* Space Atlas V4 — additive extension to existing visual language */
.v4-picker{display:flex;gap:9px;flex-wrap:wrap;margin:20px 0 24px}
.v4-world-chip{display:inline-flex;align-items:center;gap:8px;padding:10px 12px;background:#13283e;border:1px solid #31485f;border-radius:10px;color:#bcd2e7;font-size:12px;font-weight:730;cursor:pointer}
.v4-world-chip.selected,.v4-world-chip:hover{color:#f0ffff;background:#20415c;border-color:#64d9eb}
.v4-chip-dot{width:15px;height:15px;border-radius:50%;background:radial-gradient(circle at 25% 25%,#fff8,var(--planet-color) 55%,#15243a);box-shadow:0 0 12px #61d7f244}
.v4-world-layout{display:grid;grid-template-columns:minmax(260px,.87fr) minmax(0,1.13fr);gap:20px;align-items:stretch}
.v4-sphere-panel,.v4-world-info,.v4-mission-frame,.v4-mission-intro,.v4-article-section,.v4-nasa-feature{background:#0f2034;border:1px solid #29485e;border-radius:18px;padding:20px;min-width:0}
.v4-sphere-panel{background:radial-gradient(ellipse at 50% 40%,#214a63 0%,#0c2236 42%,#081625 90%);display:flex;flex-direction:column;justify-content:center}
.v4-planet-stage{position:relative;width:100%;min-height:355px;display:flex;flex-direction:column;align-items:center;justify-content:center;overflow:hidden;touch-action:pan-y}
.v4-globe-canvas{width:min(100%,310px);aspect-ratio:1;object-fit:contain;cursor:grab;touch-action:none;filter:drop-shadow(0 0 25px #569dcc55);transform-origin:center center;will-change:transform}
.v4-globe-canvas:active{cursor:grabbing}
.v4-stage-label{display:flex;flex-wrap:wrap;align-items:center;justify-content:center;gap:5px 13px;color:#8cb5cc;font-size:9px;letter-spacing:.45px;text-align:center;margin-top:1px}
.v4-stage-controls,.v4-mission-controls{display:flex;justify-content:center;flex-wrap:wrap;align-items:center;gap:7px;margin:18px 0 3px}
.v4-stage-controls button,.v4-mission-controls button{background:#1a3851;border:1px solid #365f78;border-radius:8px;color:#d5f4ff;padding:8px 11px;font-size:11px;min-height:35px;font-weight:730}
.v4-stage-controls button:hover,.v4-mission-controls button:hover{background:#2b5672}
.v4-stage-controls span{font-size:11px;min-width:35px;text-align:center;color:#b4d4e5}
.v4-world-caption,.v4-caution{color:#90acc4;font-size:11px;line-height:1.7;text-align:center;margin:10px 0 0}
.v4-world-info{padding:25px}.v4-info-head h2{font-size:clamp(29px,3vw,40px);margin:7px 0 10px;line-height:1.1}
.v4-stat-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px;margin:22px 0}
.v4-stat-grid>div{background:#122a41;border:1px solid #294b61;border-radius:12px;padding:13px}
.v4-stat-grid small{color:#84abbf;letter-spacing:1px;font-weight:760;font-size:9px;display:block;margin-bottom:8px}
.v4-stat-grid strong{display:block;font-size:13px;line-height:1.5;overflow-wrap:anywhere;color:#ecf6ff}
.v4-world-info h3,.v4-photo-search h3{font-size:16px;margin:19px 0 12px}
.v4-feature-tabs,.v4-moon-list{display:flex;gap:7px;flex-wrap:wrap}
.v4-feature-tabs button,.v4-moon-button{border:1px solid #325971;background:#1a344e;color:#bbd1e4;font-size:11px;border-radius:8px;padding:8px 10px}
.v4-feature-tabs button.selected,.v4-moon-button.selected{background:#22586c;border-color:#6bdeec;color:white}
.v4-explain{font-size:12px;line-height:1.8;color:#b6cad9;margin:12px 0}
.v4-note{font-size:11px;line-height:1.65;color:#8eaac1}
.v4-photo-search{margin-top:24px;padding-top:16px;border-top:1px solid #2b4358}
.v4-photo-search p{font-size:12px;line-height:1.7;color:#9bb8c7}
.v4-photo-search .text-link{margin-left:13px}
.v4-nasa-results{margin:15px 0 0;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}
.v4-nasa-card{display:flex;flex-direction:column;background:#152e45;border:1px solid #2f5269;border-radius:12px;overflow:hidden;text-decoration:none;min-width:0}
.v4-nasa-card img{aspect-ratio:16/10;object-fit:cover;background:#081522;max-width:100%;display:block}
.v4-nasa-card span{display:flex;flex-direction:column;gap:5px;padding:10px;font-size:11px}
.v4-nasa-card strong{line-height:1.45}.v4-nasa-card small{color:#9cb8c8;line-height:1.5}
.v4-nasa-feature{margin-top:24px;display:grid;grid-template-columns:1fr 1fr;gap:21px;align-items:center;background:linear-gradient(125deg,#101f34,#132a42)}
.v4-nasa-feature h2{font-size:23px;margin:10px 0}.v4-nasa-feature p{font-size:13px;line-height:1.7;color:#bdd0e0}
.v4-photo-credit{font-size:11px!important;color:#91b0c0!important}.v4-nasa-figure{margin:0;border-radius:12px;border:1px solid #3b5e73;overflow:hidden;background:#070e17;min-height:220px;display:grid;place-items:center}
.v4-nasa-figure img{max-height:350px;object-fit:contain;display:block}
.v4-mission-intro h2{font-size:30px;margin:7px 0}.v4-mission-intro p{color:#c0d2df;font-size:13px;line-height:1.65}
.v4-mission-frame{margin:18px 0;background:radial-gradient(ellipse at 40% 20%,#244966,#0a192a 80%)}
.v4-mission-frame svg{display:block;width:100%;height:auto;max-height:400px}.v4-mission-frame .v4-caution{text-align:left}
.v4-mission-steps{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:11px}
.v4-journey-step{border:1px solid #2c4b61;background:#11273d;border-radius:12px;text-align:left;display:flex;flex-direction:column;gap:8px;padding:16px;color:#d3e2ef;min-width:0}
.v4-journey-step.active{border-color:#67dbea;background:#21425b;box-shadow:0 0 0 1px #3d8595}
.v4-journey-step small{color:#78d4de;font-size:10px;letter-spacing:1px}
.v4-journey-step strong{font-size:14px}.v4-journey-step span{font-size:11px;line-height:1.65;color:#a4bccd}
.v4-article-section{margin:18px 0;padding:17px}.v4-article-section h3{margin:10px 0}.v4-inline-world{max-width:450px;margin:12px auto}
.v4-article-section .v4-planet-stage{min-height:275px}.v4-article-section canvas{width:235px}.v4-article-section .v4-stage-label{font-size:8px}
@media(max-width:1050px){.v4-world-layout{grid-template-columns:1fr}.v4-mission-steps{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:620px){.v4-world-info{padding:16px}.v4-sphere-panel{padding:8px}.v4-nasa-feature{grid-template-columns:1fr;padding:15px}.v4-world-layout{gap:12px}.v4-mission-steps{grid-template-columns:1fr}.v4-stat-grid{gap:7px}.v4-stat-grid>div{padding:10px}.v4-planet-stage{min-height:335px}.v4-globe-canvas{width:min(100%,285px)}.v4-picker{gap:6px}.v4-world-chip{font-size:11px;padding:9px}.v4-mission-intro h2{font-size:24px}.v4-nasa-results{grid-template-columns:1fr}}
@media(max-width:370px){.v4-world-info{padding:11px}.v4-stat-grid{grid-template-columns:1fr 1fr}.v4-stage-controls{gap:4px}.v4-stage-controls button{padding:7px 8px}.v4-photo-search .text-link{margin-left:0;display:block;margin-top:10px}}
@media(prefers-reduced-motion:reduce){.v4-globe-canvas{will-change:auto;transition:none!important}}