/* The "More Universes" page.
   The inner-page shell comes from multiverse.css; this file adds the receding
   Universe ladder and the two live Universe entry cards. */

.future-page { min-height: 100%; background: var(--ink-900); color: var(--bone); }
.future-main { --sans: "IBM Plex Sans", var(--cjk); --mono: "IBM Plex Mono", var(--cjk); padding-top: clamp(28px, 5vh, 52px); padding-bottom: clamp(34px, 6vh, 64px); font-family: var(--sans); }

/* The slices keep the homepage's receding planes: nearest first, fading backwards. */
.future-ladder { display: flex; align-items: center; margin: clamp(24px, 4vh, 38px) 0 clamp(26px, 4.5vh, 42px); }
.future-ladder span { flex: 0 0 auto; width: clamp(58px, 10vw, 132px); aspect-ratio: 1 / 1; margin-left: -2.5%; border: 1px solid #d3dfeb55; background: linear-gradient(#0b152824, #08111c55), url('../img/universe-research.svg') center / cover; transform: rotateY(-22deg); transform-origin: left center; }
.future-ladder span:first-child { margin-left: 0; }
.future-ladder span:nth-child(even) { background-image: linear-gradient(#0b152824, #08111c55), url('../img/universe-code.svg'); }
.future-ladder span:nth-child(1) { opacity: .58; }
.future-ladder span:nth-child(2) { opacity: .47; }
.future-ladder span:nth-child(3) { opacity: .38; }
.future-ladder span:nth-child(4) { opacity: .3; }
.future-ladder span:nth-child(5) { opacity: .23; }
.future-ladder span:nth-child(6) { opacity: .17; }

.future-heading { max-width: 820px; }
.future-heading h1 { margin: 12px 0 14px; font-family: var(--sans); font-size: clamp(30px, 4vw, 52px); font-weight: 420; line-height: 1.18; letter-spacing: -.04em; }
.future-label { display: inline-flex; align-items: center; gap: .5rem; margin: 0 0 20px; padding: .38rem .72rem; border: 1px solid var(--line-strong); border-radius: 999px; font-family: var(--mono); font-size: .68rem; letter-spacing: .16em; text-transform: uppercase; color: var(--bone-dim); }
.future-label::before { content: ""; width: .38rem; height: .38rem; border-radius: 50%; background: var(--science); box-shadow: 0 0 8px var(--science); }
.future-intro { max-width: 62ch; margin: 0; color: #a8b7b9; font-size: 16px; line-height: 1.8; }

.future-worlds { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 14px; max-width: 900px; margin: 0 0 clamp(24px, 4vh, 34px); padding: 0; list-style: none; }
.world-card { display: grid; gap: 9px; height: 100%; padding: 20px 22px; border: 1px solid var(--line); border-radius: var(--radius); background: linear-gradient(140deg, #ffffff0a, #ffffff02); transition: border-color 300ms var(--ease-out), background-color 300ms var(--ease-out), transform 300ms var(--ease-out); }
.world-card:hover, .world-card:focus-visible { border-color: var(--line-strong); background-color: #ffffff08; transform: translateY(-2px); }
.world-card:focus-visible { outline: 1px solid #b8cdb0cc; outline-offset: 3px; }
.world-name { font-size: 19px; letter-spacing: -.01em; }
.world-summary { color: #a8b7b9; font-size: 13px; line-height: 1.75; }
.world-enter { font-family: var(--mono); font-size: .7rem; letter-spacing: .12em; text-transform: uppercase; color: var(--bone-dim); }

.future-back { margin: 0; font-size: 13px; color: var(--bone-dim); }
.future-back a { border-bottom: 1px solid transparent; }
.future-back a:hover, .future-back a:focus-visible { color: var(--bone); border-bottom-color: var(--line-strong); }

@media (prefers-reduced-motion: reduce) {
  .world-card { transition: none; }
  .world-card:hover, .world-card:focus-visible { transform: none; }
}

@media (max-width: 640px) {
  .future-ladder span:nth-child(n + 5) { display: none; }
}