.universe-3d-page { --universe-panel: rgba(7, 12, 24, .94); background: radial-gradient(circle at 75% 8%, rgba(74, 158, 255, .17), transparent 32rem), #04070e; }
.universe-shell { width: 100%; min-width: 0; max-width: 1800px; margin: 0 auto; padding: 1rem; }

.universe-header { display: grid; grid-template-columns: minmax(0, 1fr) minmax(220px, 310px); align-items: center; gap: 1rem; padding: .25rem .2rem .6rem; }
.universe-header .section-label { margin: 0 0 .08rem; font-size: .58rem; }
.universe-header h1 { margin: 0 0 .18rem; font-size: clamp(2rem, 3.3vw, 3rem); line-height: .94; letter-spacing: -.04em; }
.universe-header > div:first-child > p:last-child { max-width: 900px; margin: 0; color: var(--text-muted); font-size: .76rem; line-height: 1.4; }
.universe-scale-note { display: grid; gap: .12rem; padding: .5rem .65rem; background: rgba(74, 158, 255, .08); border: 1px solid rgba(74, 158, 255, .25); border-radius: 7px; }
.universe-scale-note strong { color: #b9d9ff; font-size: .8rem; }
.universe-scale-note span { color: var(--text-muted); font-size: .62rem; line-height: 1.3; }

.universe-workspace { min-height: 720px; display: grid; grid-template-columns: 260px minmax(420px, 1fr) 250px; overflow: hidden; background: #03060c; border: 1px solid var(--border); border-radius: 10px; box-shadow: 0 24px 70px rgba(0, 0, 0, .35); }
.universe-controls, .universe-details { position: relative; z-index: 4; padding: 1rem; background: var(--universe-panel); }
.universe-controls { border-right: 1px solid var(--border); }
.universe-details { border-left: 1px solid var(--border); }
.universe-control-heading { display: flex; align-items: start; justify-content: space-between; gap: .5rem; margin-bottom: 1rem; }
.universe-control-heading h2, .universe-details h2 { margin: .1rem 0 0; font-size: 1.12rem; }
.universe-control-heading button { padding: .35rem .5rem; color: var(--accent); background: transparent; border: 1px solid var(--border); border-radius: 4px; cursor: pointer; }
.universe-field { display: grid; gap: .4rem; margin-top: .9rem; color: var(--text-muted); font-size: .66rem; font-weight: 750; letter-spacing: .05em; text-transform: uppercase; }
.universe-field > span { display: flex; justify-content: space-between; gap: .5rem; }
.universe-field output { color: #cbd7e8; font-family: ui-monospace, monospace; font-weight: 600; letter-spacing: 0; text-transform: none; }
.universe-field input[type="search"], .universe-field select { width: 100%; min-width: 0; height: 38px; padding: 0 .6rem; color: var(--text); background: #0b1120; border: 1px solid #30394d; border-radius: 5px; font: .75rem system-ui, sans-serif; text-transform: none; }
.universe-search-row { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: .35rem; }
.universe-search-row button, .universe-button-row button, #universe-fly { padding: .55rem .65rem; color: #e9f3ff; background: rgba(74, 158, 255, .12); border: 1px solid rgba(74, 158, 255, .38); border-radius: 5px; cursor: pointer; }
.universe-field input[type="range"] { width: 100%; accent-color: var(--accent); }
.universe-label-limit { margin-top: .65rem; }
.universe-label-limit small { color: #758197; font-size: .61rem; font-weight: 500; line-height: 1.35; letter-spacing: 0; text-transform: none; }
.universe-segmented { display: grid; grid-template-columns: 1fr 1fr; gap: .35rem; margin: 1rem 0 0; padding: 0; border: 0; }
.universe-segmented legend { grid-column: 1 / -1; margin-bottom: .4rem; color: var(--text-muted); font-size: .66rem; font-weight: 750; letter-spacing: .05em; text-transform: uppercase; }
.universe-segmented label { position: relative; }
.universe-segmented input { position: absolute; opacity: 0; pointer-events: none; }
.universe-segmented span { display: block; padding: .48rem .35rem; color: var(--text-muted); background: #0b1120; border: 1px solid #30394d; border-radius: 5px; text-align: center; font-size: .7rem; cursor: pointer; }
.universe-segmented input:checked + span { color: #fff; background: rgba(74, 158, 255, .24); border-color: var(--accent); }
.universe-check { display: flex; align-items: center; gap: .5rem; margin-top: .8rem; color: #c2ccdc; font-size: .72rem; }
.universe-check input { accent-color: var(--accent); }
.universe-model-toggle { margin-top: 1rem; padding-top: .8rem; border-top: 1px solid rgba(255, 255, 255, .08); }
.universe-model-status { margin: .3rem 0 0 1.25rem; color: #758197; font-size: .59rem; line-height: 1.35; }
.universe-nebula-list { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: .25rem; margin-top: .55rem; }
.universe-nebula-list[hidden] { display: none; }
.universe-nebula-list button { min-width: 0; padding: .38rem .2rem; color: #dcecff; background: rgba(137, 106, 255, .12); border: 1px solid rgba(153, 127, 255, .36); border-radius: 4px; font-size: .57rem; cursor: pointer; overflow: hidden; text-overflow: ellipsis; }
.universe-nebula-list button:disabled { opacity: .42; cursor: wait; }
.universe-button-row { display: grid; grid-template-columns: 1fr 1fr; gap: .4rem; margin-top: 1rem; }
.universe-count { margin-top: 1rem; color: #b9d9ff; font: .7rem ui-monospace, monospace; }
.universe-help { margin-top: .7rem; color: #758197; font-size: .66rem; line-height: 1.45; }

.universe-stage-wrap { position: relative; min-width: 0; min-height: 720px; overflow: hidden; background: radial-gradient(circle at center, #0c1830 0, #030711 48%, #010207 100%); }
.universe-stage { position: absolute; inset: 0; cursor: grab; }
.universe-stage:active { cursor: grabbing; }
.universe-stage canvas, .universe-label-layer { position: absolute; inset: 0; width: 100%; height: 100%; display: block; }
.universe-label-layer { pointer-events: none; overflow: hidden; }
.universe-star-label { padding: .12rem .28rem; color: rgba(234, 244, 255, .9); background: rgba(4, 8, 17, .62); border-radius: 3px; font: 600 .61rem system-ui, sans-serif; text-shadow: 0 1px 3px #000; transform: translate(7px, -50%); white-space: nowrap; }
.universe-star-label.is-selected { color: #fff; background: rgba(36, 104, 180, .84); }
.universe-direction-label { display: grid; gap: .08rem; padding: .3rem .42rem; color: #fff; background: rgba(3, 7, 15, .82); border-left: 2px solid #79c9ff; border-radius: 2px; font: 600 .65rem system-ui, sans-serif; text-shadow: 0 1px 3px #000; transform: translate(8px, -50%); white-space: nowrap; }
.universe-direction-label small { color: #9eabc0; font-size: .54rem; font-weight: 500; }
.universe-nebula-label { padding: .2rem .36rem; color: #fff; background: rgba(55, 24, 83, .82); border: 1px solid rgba(192, 146, 255, .65); border-radius: 999px; font: 700 .61rem system-ui, sans-serif; text-shadow: 0 1px 3px #000; transform: translate(-50%, -50%); white-space: nowrap; pointer-events: auto; cursor: pointer; }
.universe-nebula-label:focus-visible { outline: 2px solid #fff; outline-offset: 2px; }
.universe-component-label { color: #fff; font: 700 .55rem system-ui, sans-serif; text-shadow: 0 1px 4px #000, 0 0 5px #000; transform: translate(6px, -50%); white-space: nowrap; }
.universe-loading, .universe-error { position: absolute; z-index: 5; inset: 0; display: grid; place-content: center; padding: 2rem; color: #cfe4ff; background: #030711; text-align: center; }
.universe-error { gap: .4rem; color: #ffd4c4; }
.universe-error span { max-width: 460px; color: var(--text-muted); font-size: .8rem; }
.universe-error[hidden], .universe-loading[hidden] { display: none; }

.universe-details > p:not(.overline) { margin-top: .6rem; color: var(--text-muted); font-size: .78rem; line-height: 1.45; }
.universe-details dl { display: grid; gap: .4rem; margin: 1rem 0; }
.universe-details dl div { display: flex; justify-content: space-between; gap: .7rem; padding: .5rem .55rem; background: rgba(255, 255, 255, .035); border: 1px solid rgba(255, 255, 255, .06); border-radius: 4px; }
.universe-details dt { color: #7f8ca1; font-size: .63rem; text-transform: uppercase; }
.universe-details dd { margin: 0; color: #dce7f5; font-size: .7rem; font-weight: 700; text-align: right; }
#universe-fly { width: 100%; }
#universe-hr-link { display: block; margin-top: .6rem; padding: .55rem; color: var(--accent); border: 1px solid rgba(74, 158, 255, .28); border-radius: 5px; text-align: center; text-decoration: none; font-size: .7rem; }
.universe-source-link { display: block; margin-top: .6rem; padding: .55rem; color: #c4adff; border: 1px solid rgba(166, 126, 255, .32); border-radius: 5px; text-align: center; text-decoration: none; font-size: .7rem; }
.universe-source-link[hidden], #universe-hr-link[hidden] { display: none; }
.universe-prototype-note { max-width: 900px; padding: 2rem .25rem 3rem; }
.universe-prototype-note h2 { margin: .2rem 0 .5rem; font-size: 1.5rem; }
.universe-prototype-note p:not(.section-label) { color: var(--text-muted); line-height: 1.65; }
.universe-prototype-note strong { color: #dbeaff; }
.universe-prototype-note p + p { margin-top: .65rem; }

@media (min-width: 1751px) {
  .universe-3d-page { display: grid; grid-template-columns: 280px minmax(0, 1fr); align-items: start; }
  .universe-3d-page > .side-menu { grid-column: 1; grid-row: 1; }
  .universe-3d-page > .universe-shell { grid-column: 2; grid-row: 1; }
  .universe-3d-page > .site-footer-generated { grid-column: 2; }
}
@media (max-width: 1750px) and (min-width: 1024px) {
  .universe-3d-page { display: block; }
  .universe-3d-page > .navbar { display: flex; }
  .universe-3d-page .menu-toggle { display: block !important; }
  .universe-3d-page > .side-menu { position: fixed; width: 300px; height: 100vh; min-height: 0; padding: 3.5rem 1.5rem 1.5rem; transform: translateX(-100%); }
  .universe-3d-page > .side-menu.active { transform: translateX(0); }
  .universe-3d-page .menu-close { display: block; }
}
@media (max-width: 1120px) {
  .universe-workspace { grid-template-columns: 240px minmax(380px, 1fr); }
  .universe-details { grid-column: 1 / -1; display: grid; grid-template-columns: minmax(180px, 1fr) 2fr; gap: .4rem 1rem; border-top: 1px solid var(--border); border-left: 0; }
  .universe-details dl { grid-column: 2; grid-row: 1 / span 5; margin: 0; }
  .universe-details #universe-fly, .universe-details #universe-hr-link { grid-column: 1; }
}
@media (max-width: 760px) {
  .universe-shell { padding: .6rem; }
  .universe-header { grid-template-columns: 1fr; }
  .universe-workspace { display: flex; flex-direction: column; min-height: 0; }
  .universe-controls { border-right: 0; border-bottom: 1px solid var(--border); }
  .universe-stage-wrap { min-height: 66vh; order: 2; }
  .universe-details { display: block; order: 3; }
  .universe-details dl { margin: 1rem 0; }
}
@media (min-width: 2200px) {
  .universe-shell { max-width: calc(100vw - 280px); }
  .universe-workspace {
    height: max(860px, calc(100vh - 176px));
    min-height: 860px;
  }
  .universe-stage-wrap {
    height: 100%;
    min-height: 0;
  }
}
@media (prefers-reduced-motion: reduce) { .universe-stage { scroll-behavior: auto; } }