/* PiExplorer — observatory night palette: ink, parchment gold, glacier teal. */
:root {
  --ink: #060912; --panel: rgba(12, 18, 34, 0.72);
  --line: rgba(166, 190, 226, 0.15); --line-2: rgba(166, 190, 226, 0.28);
  --text: #d5dcea; --dim: #7f8aa3; --gold: #e4c27a; --teal: #78c6c8;
  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, "Book Antiqua", Georgia, serif;
  --mono: ui-monospace, "SF Mono", "Cascadia Mono", Menlo, Consolas, "Liberation Mono", monospace;
  --ease: cubic-bezier(.2, .8, .2, 1);
}
* { box-sizing: border-box; margin: 0; }
html, body { height: 100%; background: var(--ink); color: var(--text); overflow: hidden; }
body { font: 13px/1.5 var(--mono); -webkit-font-smoothing: antialiased; background: radial-gradient(120% 90% at 50% 45%, #0d1530 0%, var(--ink) 62%); user-select: none; -webkit-user-select: none; }
#stage { position: fixed; inset: 0; width: 100%; height: 100%; display: block; touch-action: none; cursor: grab; outline: none; }
#stage.dragging { cursor: grabbing; }
[hidden] { display: none !important; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }
input { font: inherit; color: inherit; }
.ico { width: 18px; height: 18px; fill: none; stroke: currentColor; stroke-width: 1.5; stroke-linecap: round; stroke-linejoin: round; }
:focus-visible { outline: 1px solid var(--gold); outline-offset: 2px; }
body::after { content: ""; position: fixed; inset: 0; pointer-events: none; opacity: .05; mix-blend-mode: overlay;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence baseFrequency='.9' numOctaves='2'/%3E%3C/filter%3E%3Crect width='160' height='160' filter='url(%23n)'/%3E%3C/svg%3E"); }

.intro { position: fixed; inset: 0; z-index: 50; display: grid; place-content: center; justify-items: center; gap: 18px; background: var(--ink); transition: opacity 1s var(--ease), visibility 1s; }
.intro.gone { opacity: 0; visibility: hidden; pointer-events: none; }
.intro-pi { font: 400 clamp(90px, 22vw, 190px)/1 var(--serif); color: var(--gold); animation: breathe 4s ease-in-out infinite; }
.intro-pi.small { font-size: 64px; animation: none; }
.intro-slogan { font: italic 400 clamp(15px, 2.4vw, 20px) var(--serif); letter-spacing: .04em; opacity: .85; text-align: center; padding: 0 24px; }
.intro-bar { width: 140px; height: 1px; background: var(--line); overflow: hidden; }
.intro-bar i { display: block; height: 100%; width: 0; background: var(--gold); transition: width .2s ease; }
.intro-percent { color: var(--gold); font-size: 12px; font-variant-numeric: tabular-nums; }
.landmark-shortcuts { position: fixed; left: 20px; top: 86px; z-index: 5; display: flex; flex-direction: column; gap: 8px; }
.begin-shortcut { padding: 10px 14px; background: var(--panel); color: var(--gold); border: 1px solid var(--line); border-radius: 12px; cursor: pointer; text-align: center; }
.begin-shortcut span { display: block; margin-top: 4px; font-size: 11px; opacity: .75; }
.row.result-actions { justify-content: center; align-items: center; }
.trail-hint { position: fixed; left: 50%; bottom: 82px; transform: translateX(-50%); width: max-content; max-width: 90vw; text-align: center; z-index: 4; color: var(--gold); font-size: 11px; background: var(--panel); padding: 6px 12px; border-radius: 10px; pointer-events: none; }
@media (max-width: 700px) { .landmark-shortcuts { left: auto; right: 12px; top: 72px; } .begin-shortcut { padding: 7px 10px; } .trail-hint { bottom: 88px; max-width: 85vw; font-size: 10px; } }
@keyframes slide { from { transform: translateX(-110%); } to { transform: translateX(260%); } }
@keyframes breathe { 50% { opacity: .72; transform: scale(.985); } }

.top { position: fixed; top: 0; left: 0; right: 0; padding: max(16px, env(safe-area-inset-top)) 20px 0; display: flex; justify-content: space-between; align-items: flex-start; gap: 16px; pointer-events: none; z-index: 5; }
.top > * { pointer-events: auto; }
.brand { display: flex; gap: 12px; align-items: center; pointer-events: none; }
.brand-mark { width: 38px; height: 38px; display: grid; place-items: center; border: 1px solid var(--line-2); border-radius: 50%; font: 22px/1 var(--serif); color: var(--gold); }
.brand h1 { font: 500 15px var(--mono); letter-spacing: .24em; text-transform: uppercase; }
.brand p { font: italic 13px var(--serif); color: var(--dim); }
.top-right { display: flex; gap: 8px; align-items: center; }
.search { display: flex; align-items: center; gap: 8px; width: min(380px, 42vw); padding: 0 6px 0 12px; height: 38px; background: var(--panel); border: 1px solid var(--line); border-radius: 19px; backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px); transition: border-color .25s, width .35s var(--ease); user-select: text; -webkit-user-select: text; }
.search:focus-within { border-color: var(--gold); width: min(440px, 52vw); }
.search .ico { color: var(--dim); flex: none; }
.search input { flex: 1; min-width: 0; background: none; border: 0; outline: 0; font-size: 13px; letter-spacing: .04em; }
.search input::placeholder { color: #566079; }
.go { height: 28px; padding: 0 12px; border-radius: 14px; background: rgba(228, 194, 122, .12); color: var(--gold); letter-spacing: .1em; text-transform: uppercase; font-size: 11px; transition: background .2s; }
.go:hover { background: rgba(228, 194, 122, .24); }
.icon-btn { width: 38px; height: 38px; display: grid; place-items: center; border-radius: 50%; background: var(--panel); border: 1px solid var(--line); backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px); color: var(--text); transition: border-color .2s, color .2s, transform .2s var(--ease); flex: none; }
.icon-btn:hover { border-color: var(--gold); color: var(--gold); }
.icon-btn:active { transform: scale(.92); }
.icon-btn.txt { width: auto; padding: 0 14px; border-radius: 19px; font-size: 11px; letter-spacing: .12em; }
.icon-btn.txt span { color: var(--teal); }
.only-mobile { display: none; }

.hud { position: fixed; left: 20px; bottom: max(20px, env(safe-area-inset-bottom)); display: grid; gap: 8px; pointer-events: none; z-index: 4; }
.hud > div { display: flex; flex-direction: column; border-left: 1px solid var(--line-2); padding-left: 10px; }
.hud span { font-size: 10px; letter-spacing: .18em; text-transform: uppercase; color: var(--dim); }
.hud b { font: 500 15px var(--mono); font-variant-numeric: tabular-nums; }
.legend { position: fixed; right: 20px; bottom: max(26px, env(safe-area-inset-bottom)); z-index: 4; display: flex; align-items: center; gap: 8px; font-size: 10px; letter-spacing: .12em; color: var(--dim); pointer-events: none; }
.legend .sw { display: flex; flex-direction: column; align-items: center; gap: 3px; }
.legend .sw i { width: 14px; height: 6px; border-radius: 1px; display: block; }
.legend .ramp { width: 130px; height: 6px; border-radius: 3px; }

.dock { position: fixed; left: 50%; bottom: max(18px, env(safe-area-inset-bottom)); transform: translateX(-50%); display: flex; align-items: center; gap: 8px; padding: 6px; background: var(--panel); border: 1px solid var(--line); border-radius: 28px; backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px); z-index: 6; box-shadow: 0 18px 50px rgba(0, 0, 0, .45); }
.dock .icon-btn { background: transparent; border-color: transparent; }
.dock .icon-btn:hover { background: rgba(228, 194, 122, .08); }
.sep { width: 1px; height: 20px; background: var(--line-2); }
.seg { display: flex; background: rgba(0, 0, 0, .25); border-radius: 20px; padding: 3px; }
.seg button { height: 32px; padding: 0 14px; border-radius: 16px; font-size: 11px; letter-spacing: .12em; text-transform: uppercase; color: var(--dim); transition: color .2s, background .25s var(--ease); }
.seg button.on { background: rgba(228, 194, 122, .16); color: var(--gold); }

.side { position: fixed; top: 76px; right: 20px; width: 300px; display: grid; gap: 12px; align-content: start; z-index: 5; max-height: calc(100dvh - 170px); overflow: auto; scrollbar-width: none; }
.card { background: var(--panel); border: 1px solid var(--line); border-radius: 14px; padding: 14px 16px; backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px); animation: rise .4s var(--ease); user-select: text; -webkit-user-select: text; }
@keyframes rise { from { opacity: 0; transform: translateY(8px); } }
.card-head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 8px; }
.eyebrow { font-size: 10px; letter-spacing: .2em; text-transform: uppercase; color: var(--gold); }
.x { width: 24px; height: 24px; font-size: 18px; line-height: 1; color: var(--dim); border-radius: 50%; }
.x:hover { color: var(--text); background: rgba(255, 255, 255, .06); }
.cell-title { font: 21px/1.25 var(--serif); margin-bottom: 8px; }
.kv { display: grid; grid-template-columns: auto 1fr; gap: 3px 12px; font-size: 12px; }
.kv dt { color: var(--dim); } .kv dd { text-align: right; font-variant-numeric: tabular-nums; }
.bars { display: grid; gap: 3px; margin: 12px 0; }
.bar { display: grid; grid-template-columns: 12px 1fr 44px; align-items: center; gap: 8px; font-size: 11px; color: var(--dim); }
.bar .t { height: 4px; background: rgba(255, 255, 255, .05); border-radius: 2px; overflow: hidden; }
.bar .t i { display: block; height: 100%; transform-origin: left; transform: scaleX(0); transition: transform .4s var(--ease); }
.bar em { font-style: normal; text-align: right; font-variant-numeric: tabular-nums; }
.ghost { height: 32px; padding: 0 14px; border: 1px solid var(--line-2); border-radius: 16px; font-size: 11px; letter-spacing: .1em; text-transform: uppercase; color: var(--text); transition: all .2s; }
.ghost:hover { border-color: var(--gold); color: var(--gold); }
.ghost.solid { background: rgba(228, 194, 122, .14); border-color: rgba(228, 194, 122, .5); color: var(--gold); }
.row { display: flex; gap: 8px; flex-wrap: wrap; }
.ctx { font: 500 15px/1.7 var(--mono); letter-spacing: .08em; word-break: break-all; color: var(--dim); margin: 8px 0 12px; }
.ctx mark { background: rgba(228, 194, 122, .18); color: var(--gold); padding: 1px 2px; border-radius: 2px; box-shadow: inset 0 -1px 0 var(--gold); }
.result .big { font: 24px/1.15 var(--serif); }
.result .sub { color: var(--dim); font-size: 12px; margin-top: 2px; }
.prog { height: 2px; background: var(--line); margin: 10px 0; overflow: hidden; border-radius: 1px; }
.prog i { display: block; height: 100%; background: var(--gold); transform-origin: left; transform: scaleX(0); transition: transform .2s linear; }
.err { color: #e59a8c; }
.sample { margin-top: 10px; padding-top: 8px; border-top: 1px solid var(--line); font-size: 11px; color: var(--dim); }
.cell-actions { margin-top: 2px; }

.status { position: fixed; top: 76px; left: 50%; transform: translateX(-50%); display: flex; align-items: center; gap: 8px; padding: 5px 12px; border: 1px solid var(--line); border-radius: 14px; background: var(--panel); font-size: 11px; letter-spacing: .1em; color: var(--dim); z-index: 4; backdrop-filter: blur(10px); }
.status i { width: 6px; height: 6px; border-radius: 50%; background: var(--teal); animation: pulse 1s ease-in-out infinite; }
@keyframes pulse { 50% { opacity: .25; transform: scale(.7); } }

.about { margin: auto; width: min(780px, calc(100vw - 28px)); max-height: calc(100dvh - 40px); overflow: auto; padding: 28px 32px; background: #0a1022; color: var(--text); border: 1px solid var(--line-2); border-radius: 16px; user-select: text; -webkit-user-select: text; }
.about::backdrop { background: rgba(3, 5, 12, .72); backdrop-filter: blur(4px); }
.about .x { position: absolute; top: 14px; right: 14px; }
.about h2 { font: 400 28px var(--serif); color: var(--gold); }
.about h3 { font-size: 10px; letter-spacing: .2em; text-transform: uppercase; color: var(--teal); margin: 14px 0 6px; font-weight: 500; }
.about p { margin-bottom: 8px; color: #b3bdd0; }
.about .lead { font: italic 16px var(--serif); color: var(--text); margin: 6px 0 10px; }
.about .cols { display: grid; grid-template-columns: 1fr 1fr; gap: 28px; }
.about .fine { margin-top: 14px; padding-top: 12px; border-top: 1px solid var(--line); font-size: 11px; color: var(--dim); }
.nogl { position: fixed; inset: 0; z-index: 60; display: grid; place-items: center; text-align: center; background: var(--ink); padding: 24px; }
.nogl h2 { font: 400 24px var(--serif); margin: 8px 0; } .nogl p { color: var(--dim); max-width: 420px; margin: 0 auto 16px; }

@media (max-width: 760px) {
  .top { padding: max(12px, env(safe-area-inset-top)) 12px 0; }
  .brand p { display: none; } .brand-mark { width: 34px; height: 34px; }
  .only-mobile { display: grid; }
  .search { position: fixed; top: calc(max(12px, env(safe-area-inset-top)) + 46px); left: 12px; right: 12px; width: auto !important; display: none; }
  .top.search-open .search { display: flex; }
  .hud { left: 14px; bottom: auto; top: calc(max(12px, env(safe-area-inset-top)) + 54px); gap: 4px; }
  .top.search-open ~ .hud { top: calc(max(12px, env(safe-area-inset-top)) + 100px); }
  .hud b { font-size: 12px; } .hud span { font-size: 9px; } .hide-xs { display: none !important; }
  .legend { display: none; }
  .side { top: auto; left: 12px; right: 12px; width: auto; bottom: calc(max(18px, env(safe-area-inset-bottom)) + 62px); max-height: 46dvh; }
  .dock { gap: 2px; padding: 4px; max-width: calc(100vw - 16px); }
  .seg button { padding: 0 10px; } .icon-btn.txt { padding: 0 10px; } .icon-btn { width: 36px; height: 36px; }
  .status { top: auto; bottom: calc(max(18px, env(safe-area-inset-bottom)) + 62px); }
  .about { padding: 22px 20px; } .about .cols { grid-template-columns: 1fr; gap: 0; }
}
@media (prefers-reduced-motion: reduce) { *, *::before, *::after { animation-duration: .01ms !important; transition-duration: .01ms !important; } }