/* ══════════════════════════════════════════════════════════════
   langtime — shared stylesheet
   served identically by the python / java / swift / go backends
   ══════════════════════════════════════════════════════════════ */

/* registered props so a language switch *morphs* instead of snapping */
@property --c1 { syntax: '<color>'; inherits: true; initial-value: #3776ab; }
@property --c2 { syntax: '<color>'; inherits: true; initial-value: #ffd43b; }
@property --c3 { syntax: '<color>'; inherits: true; initial-value: #7cc4ff; }
@property --logo-a { syntax: '<color>'; inherits: true; initial-value: #3776ab; }
@property --logo-b { syntax: '<color>'; inherits: true; initial-value: #ffd43b; }

:root {
  --ink: #f4f7ff;
  --ink-dim: #9aa6c4;
  --glass: rgba(16, 20, 40, 0.55);
  --stroke: rgba(255, 255, 255, 0.14);
  --rot: 7s;
  color-scheme: dark;
  transition: --c1 .9s ease, --c2 .9s ease, --c3 .9s ease,
              --logo-a .9s ease, --logo-b .9s ease;
}

html[data-lang="python"] { --c1:#3776ab; --c2:#ffd43b; --c3:#7cc4ff; --logo-a:#4b8bbe; --logo-b:#ffd43b; }
html[data-lang="java"]   { --c1:#ff7a18; --c2:#e11d48; --c3:#ffb86b; --logo-a:#ff7a18; --logo-b:#ffd9b0; }
html[data-lang="swift"]  { --c1:#ff5a2d; --c2:#ff2d78; --c3:#ffb199; --logo-a:#f05138; --logo-b:#fff;    }
html[data-lang="go"]     { --c1:#00b5d8; --c2:#79ffe1; --c3:#a6f4ff; --logo-a:#00add8; --logo-b:#ffe873; }

*, *::before, *::after { box-sizing: border-box; }

html, body { height: 100%; }

body {
  margin: 0;
  display: grid;
  grid-template-rows: auto 1fr auto;
  font-family: ui-sans-serif, -apple-system, "SF Pro Text", "Helvetica Neue", system-ui, sans-serif;
  color: var(--ink);
  background: #04040c;
  overflow: hidden;
}

.sprite { position: absolute; width: 0; height: 0; }

/* ─────────────────────────── ambience ─────────────────────────── */
.bg { position: fixed; inset: 0; z-index: 0; pointer-events: none; overflow: hidden; }

.aurora {
  position: absolute; inset: -30%;
  background:
    radial-gradient(38% 42% at 22% 28%, color-mix(in oklab, var(--c1) 85%, transparent) 0%, transparent 70%),
    radial-gradient(34% 38% at 78% 24%, color-mix(in oklab, var(--c2) 78%, transparent) 0%, transparent 70%),
    radial-gradient(46% 46% at 50% 88%, color-mix(in oklab, var(--c3) 62%, transparent) 0%, transparent 72%),
    #05050f;
  filter: blur(70px) saturate(150%);
  opacity: .85;
  animation: drift 26s ease-in-out infinite alternate;
}
@keyframes drift {
  0%   { transform: scale(1) rotate(0deg)   translate3d(0,0,0); }
  50%  { transform: scale(1.12) rotate(8deg) translate3d(2%, -2%, 0); }
  100% { transform: scale(1.05) rotate(-6deg) translate3d(-2%, 1%, 0); }
}

/* a wide specular sweep that rakes across the whole scene */
.beam {
  position: absolute; top: -40%; left: -60%; width: 60%; height: 180%;
  background: linear-gradient(100deg, transparent, rgba(255,255,255,.10) 42%, rgba(255,255,255,.22) 50%, rgba(255,255,255,.10) 58%, transparent);
  filter: blur(26px);
  transform: rotate(14deg);
  animation: rake 9s cubic-bezier(.45,.05,.55,.95) infinite;
  mix-blend-mode: screen;
}
@keyframes rake { 0%,70% { left: -60%; } 100% { left: 130%; } }

/* perspective floor grid — cheap depth, big payoff */
.grid {
  position: absolute; left: -25%; right: -25%; bottom: -12%; height: 62%;
  background-image:
    linear-gradient(color-mix(in oklab, var(--c3) 55%, transparent) 1px, transparent 1px),
    linear-gradient(90deg, color-mix(in oklab, var(--c3) 45%, transparent) 1px, transparent 1px);
  background-size: 88px 88px, 88px 88px;
  transform: perspective(420px) rotateX(74deg);
  transform-origin: bottom center;
  mask-image: linear-gradient(to top, #000 4%, transparent 82%);
  opacity: .5;
  animation: crawl 4.6s linear infinite;
}
@keyframes crawl { to { background-position: 0 88px, 88px 0; } }

/* ── glitter: two twinkling starfields at different depths ── */
.glitter {
  position: absolute; inset: -10%;
  --s: radial-gradient(circle, rgba(255,255,255,.95) 0 38%, transparent 42%);
  background-image: var(--s), var(--s), var(--s), var(--s), var(--s), var(--s), var(--s), var(--s), var(--s), var(--s), var(--s), var(--s);
  background-size: 3px 3px;
  background-repeat: no-repeat;
  background-position:
     6% 18%, 17% 66%, 26% 31%, 34% 84%, 43% 12%, 51% 52%,
    59% 27%, 68% 73%, 76% 41%, 84% 16%, 91% 61%, 96% 35%;
  filter: drop-shadow(0 0 6px color-mix(in oklab, var(--c2) 80%, white));
  animation: twinkle 3.4s ease-in-out infinite;
  mix-blend-mode: screen;
}
.glitter--slow {
  background-size: 2px 2px;
  background-position:
    11% 41%, 21% 12%, 31% 58%, 39% 24%, 48% 79%, 56% 8%,
    64% 48%, 72% 21%, 80% 66%, 88% 37%, 94% 77%, 99% 14%;
  animation-duration: 5.7s; animation-delay: -1.9s;
  filter: drop-shadow(0 0 8px color-mix(in oklab, var(--c1) 80%, white));
  opacity: .8;
}
@keyframes twinkle {
  0%, 100% { opacity: .25; transform: scale(1); }
  50%      { opacity: 1;   transform: scale(1.35); }
}

.vignette {
  position: absolute; inset: 0;
  background: radial-gradient(120% 90% at 50% 45%, transparent 38%, rgba(0,0,0,.72) 100%);
}

/* ─────────────────────────── chrome ─────────────────────────── */
.topbar {
  position: relative; z-index: 3;
  display: flex; align-items: center; gap: 20px;
  padding: 20px 28px;
}

.wordmark {
  font-weight: 800; font-size: 19px; letter-spacing: -.02em;
  display: flex; align-items: center; gap: 9px;
  text-shadow: 0 2px 18px rgba(0,0,0,.6);
}
.wordmark__accent {
  background: linear-gradient(92deg, var(--c1), var(--c2));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.wordmark__dot {
  width: 11px; height: 11px; border-radius: 50%;
  background: var(--c2);
  box-shadow: 0 0 0 4px color-mix(in oklab, var(--c2) 22%, transparent), 0 0 22px var(--c2);
  animation: pulse 2.2s ease-in-out infinite;
}
@keyframes pulse { 50% { transform: scale(.7); opacity: .55; } }

.rail { display: flex; gap: 10px; margin-left: auto; }

.pip {
  appearance: none; cursor: pointer;
  display: flex; align-items: center; gap: 8px;
  padding: 8px 14px 8px 10px;
  border-radius: 999px;
  border: 1px solid var(--stroke);
  background: rgba(255,255,255,.05);
  color: var(--ink-dim);
  font: 600 12.5px/1 ui-sans-serif, system-ui, sans-serif;
  letter-spacing: .02em;
  backdrop-filter: blur(14px) saturate(160%);
  transition: transform .28s cubic-bezier(.2,.9,.2,1), background .28s, color .28s, border-color .28s, box-shadow .28s;
}
.pip:hover { transform: translateY(-2px); color: var(--ink); }
.pip svg { width: 17px; height: 17px; opacity: .75; transition: opacity .28s; }
.pip i {
  width: 7px; height: 7px; border-radius: 50%;
  background: #4a5573; box-shadow: none;
  transition: background .3s, box-shadow .3s;
}
.pip[data-online="1"] i { background: #3ddc97; box-shadow: 0 0 10px #3ddc97; }
.pip[aria-selected="true"] {
  color: #08080f; border-color: transparent;
  background: linear-gradient(100deg, var(--c2), var(--c1));
  box-shadow: 0 8px 26px -8px var(--c1), 0 0 0 1px rgba(255,255,255,.25) inset;
  transform: translateY(-2px);
}
.pip[aria-selected="true"] svg { opacity: 1; }
.pip[data-online="0"] { opacity: .45; }

.ghost-btn {
  appearance: none; cursor: pointer;
  display: flex; align-items: center; gap: 7px;
  padding: 8px 14px; border-radius: 999px;
  border: 1px solid var(--stroke);
  background: rgba(255,255,255,.05);
  color: var(--ink-dim);
  font: 600 12.5px/1 ui-sans-serif, system-ui, sans-serif;
  backdrop-filter: blur(14px);
  transition: color .25s, background .25s, transform .25s;
}
.ghost-btn:hover { color: var(--ink); transform: translateY(-2px); }
.ghost-btn__icon { font-size: 11px; }

/* ─────────────────────────── the card ─────────────────────────── */
.stage {
  position: relative; z-index: 2;
  display: grid; place-items: center;
  perspective: 1400px; perspective-origin: 50% 45%;
  padding: 10px 24px 30px;
  min-height: 0;
}

.tilt {
  transform-style: preserve-3d;
  transform: rotateX(var(--rx, 0deg)) rotateY(var(--ry, 0deg));
  transition: transform .5s cubic-bezier(.2,.9,.2,1);
  will-change: transform;
}

.card {
  --pad: clamp(26px, 3.4vw, 46px);
  position: relative;
  width: min(660px, 92vw);
  border-radius: 30px;
  padding: var(--pad);
  transform-style: preserve-3d;
  background:
    linear-gradient(160deg, rgba(255,255,255,.14), rgba(255,255,255,.03) 38%, rgba(255,255,255,0) 62%),
    var(--glass);
  border: 1px solid var(--stroke);
  backdrop-filter: blur(26px) saturate(190%);
  box-shadow:
    0 1px 0 rgba(255,255,255,.35) inset,
    0 -1px 0 rgba(0,0,0,.4) inset,
    0 2px 0 color-mix(in oklab, var(--c1) 55%, black),
    0 4px 0 color-mix(in oklab, var(--c1) 34%, black),
    0 6px 0 rgba(0,0,0,.55),
    0 46px 90px -30px color-mix(in oklab, var(--c1) 60%, transparent),
    0 80px 120px -60px color-mix(in oklab, var(--c2) 50%, transparent),
    0 30px 70px -20px rgba(0,0,0,.85);
  animation: float 8.5s ease-in-out infinite;
}
@keyframes float {
  0%, 100% { translate: 0 0; }
  50%      { translate: 0 -12px; }
}

/* neon rim that traces the card */
.card__edge {
  position: absolute; inset: -1px; border-radius: inherit; padding: 1.5px;
  background: linear-gradient(115deg, var(--c2), transparent 28%, transparent 66%, var(--c1));
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor; mask-composite: exclude;
  opacity: .95;
  animation: hue 12s linear infinite;
}
@keyframes hue { to { filter: hue-rotate(360deg); } }

/* glossy sweep clipped to the card */
.card__shine {
  position: absolute; inset: 0; border-radius: inherit; overflow: hidden;
  pointer-events: none;
}
.card__shine::after {
  content: ""; position: absolute; top: -60%; left: -40%;
  width: 45%; height: 220%;
  background: linear-gradient(100deg, transparent, rgba(255,255,255,.30), transparent);
  transform: rotate(18deg);
  animation: sheen 6.5s ease-in-out infinite;
}
@keyframes sheen { 0%, 62% { left: -45%; } 100% { left: 115%; } }

/* soft contact shadow / reflection under the slab */
.card__floor {
  position: absolute; left: 8%; right: 8%; bottom: -34px; height: 34px;
  background: radial-gradient(50% 100% at 50% 0%, color-mix(in oklab, var(--c1) 70%, transparent), transparent 72%);
  filter: blur(12px); opacity: .85;
}

.card__inner { position: relative; transform: translateZ(40px); }

.card__head { display: flex; align-items: center; gap: 18px; }

.chip {
  display: grid; place-items: center;
  width: 62px; height: 62px; border-radius: 19px; flex: 0 0 auto;
  background: linear-gradient(150deg, rgba(255,255,255,.22), rgba(255,255,255,.04));
  border: 1px solid rgba(255,255,255,.22);
  box-shadow:
    0 1px 0 rgba(255,255,255,.5) inset,
    0 -2px 6px rgba(0,0,0,.35) inset,
    0 10px 24px -8px color-mix(in oklab, var(--c1) 80%, transparent);
  transform: translateZ(26px);
  animation: bob 6s ease-in-out infinite;
}
@keyframes bob { 50% { rotate: -5deg; } }
.chip__logo { width: 38px; height: 38px; filter: drop-shadow(0 3px 7px rgba(0,0,0,.55)); }

.card__titles { min-width: 0; }

.brand {
  margin: 0; font-size: clamp(30px, 4.6vw, 46px); font-weight: 850;
  letter-spacing: -.035em; line-height: 1;
  background: linear-gradient(96deg, #fff 6%, var(--c2) 46%, var(--c1) 96%);
  -webkit-background-clip: text; background-clip: text; color: transparent;
  filter:
    drop-shadow(0 1px 0 rgba(255,255,255,.35))
    drop-shadow(0 3px 0 rgba(0,0,0,.55))
    drop-shadow(0 12px 28px color-mix(in oklab, var(--c1) 85%, transparent));
}

.meta { display: flex; gap: 8px; margin-top: 10px; }
.pill {
  font: 700 11px/1 ui-monospace, "SF Mono", Menlo, monospace;
  /* No uppercase here: these pills carry case-sensitive values — URL paths and
     runtime versions. Upper-casing them renders something untrue, since
     /API/PYTHON/TIME 404s and go1.27.1 is not GO1.27.1. */
  letter-spacing: .06em;
  padding: 6px 10px; border-radius: 8px;
  background: color-mix(in oklab, var(--c1) 26%, transparent);
  border: 1px solid color-mix(in oklab, var(--c1) 45%, transparent);
  color: #eaf2ff;
}
a.pill {
  text-decoration: none;
  transition: background .2s, border-color .2s, transform .2s;
}
a.pill:hover {
  background: color-mix(in oklab, var(--c1) 48%, transparent);
  border-color: color-mix(in oklab, var(--c2) 70%, transparent);
  transform: translateY(-1px);
}
.pill--dim { background: rgba(255,255,255,.06); border-color: var(--stroke); color: var(--ink-dim); }

/* countdown to the next language */
.ring { width: 46px; height: 46px; margin-left: auto; flex: 0 0 auto; transform: rotate(-90deg) translateZ(18px); }
.ring circle { fill: none; stroke-width: 3.5; stroke-linecap: round; }
.ring__track { stroke: rgba(255,255,255,.12); }
.ring__fill {
  stroke: var(--c2);
  stroke-dasharray: 125.6; stroke-dashoffset: 125.6;
  filter: drop-shadow(0 0 7px var(--c2));
  transition: stroke-dashoffset .25s linear;
}

.caption {
  margin: clamp(22px, 3vw, 32px) 0 0;
  font-size: 13px; font-weight: 700; letter-spacing: .26em; text-transform: uppercase;
  color: var(--ink-dim);
}
.caption::after {
  content: ""; display: block; height: 1px; margin-top: 12px;
  background: linear-gradient(90deg, color-mix(in oklab, var(--c2) 70%, transparent), transparent 70%);
}

.dateline {
  margin-top: 18px;
  font: 800 clamp(26px, 3.6vw, 38px)/1 ui-monospace, "SF Mono", Menlo, monospace;
  letter-spacing: .01em;
  color: #fff;
  text-shadow:
    0 1px 0 color-mix(in oklab, var(--c1) 70%, black),
    0 2px 0 color-mix(in oklab, var(--c1) 52%, black),
    0 3px 0 rgba(0,0,0,.6),
    0 14px 30px color-mix(in oklab, var(--c2) 60%, transparent);
}

.zones { margin-top: 20px; display: grid; gap: 9px; }

.zone {
  display: flex; align-items: baseline; gap: 14px;
  padding: 11px 16px; border-radius: 14px;
  background: linear-gradient(100deg, rgba(255,255,255,.085), rgba(255,255,255,.025));
  border: 1px solid rgba(255,255,255,.09);
  box-shadow: 0 1px 0 rgba(255,255,255,.16) inset, 0 8px 20px -14px rgba(0,0,0,.9);
  transform: translateZ(calc(var(--z, 0) * 5px));
}
.zone__time {
  font: 750 clamp(25px, 3.5vw, 35px)/1 ui-monospace, "SF Mono", Menlo, monospace;
  font-variant-numeric: tabular-nums;
  letter-spacing: .01em;
  background: linear-gradient(180deg, #fff, var(--c3));
  -webkit-background-clip: text; background-clip: text; color: transparent;
  filter: drop-shadow(0 2px 0 rgba(0,0,0,.45)) drop-shadow(0 0 16px color-mix(in oklab, var(--c3) 55%, transparent));
}
.zone__abbr {
  margin-left: auto;
  font: 750 13px/1 ui-monospace, "SF Mono", Menlo, monospace;
  letter-spacing: .18em;
  color: color-mix(in oklab, var(--c2) 80%, white);
  text-shadow: 0 0 14px color-mix(in oklab, var(--c2) 70%, transparent);
}
.zone__city { font-size: 11.5px; letter-spacing: .14em; text-transform: uppercase; color: var(--ink-dim); }

/* per-character digit roll */
.d {
  display: inline-block;
  /* Animated glyphs need their own paint layer: clipping only the parent
     can leave transparent digits after their transform animation. */
  background: linear-gradient(180deg, #fff, var(--c3));
  -webkit-background-clip: text; background-clip: text;
  color: transparent;
}
.d--pop { animation: pop .42s cubic-bezier(.2,.9,.2,1); }
@keyframes pop {
  0%   { transform: translateY(-58%) rotateX(-84deg) scale(1.1); opacity: 0; filter: blur(2px); }
  60%  { transform: translateY(4%) rotateX(8deg) scale(1); opacity: 1; filter: blur(0); }
  100% { transform: none; }
}

/* ── machine readout: what box is this, no identity ── */
.machine {
  margin-top: 18px;
  font: 600 11.5px/1.4 ui-monospace, "SF Mono", Menlo, monospace;
  letter-spacing: .12em; text-transform: uppercase;
  color: color-mix(in oklab, var(--c3) 62%, white);
  opacity: .9;
}

/* ── instrument strip: the four runtimes disagreeing with each other ── */
.strip {
  margin-top: 14px;
  display: grid; gap: 9px;
  grid-template-columns: 1.5fr 1fr 1fr 1.3fr;
}
@media (max-width: 720px) { .strip { grid-template-columns: 1fr 1fr; } }

.tile {
  position: relative; overflow: hidden;
  padding: 10px 12px; border-radius: 12px;
  background: linear-gradient(150deg, rgba(255,255,255,.075), rgba(255,255,255,.02));
  border: 1px solid rgba(255,255,255,.08);
  box-shadow: 0 1px 0 rgba(255,255,255,.13) inset;
  transform: translateZ(14px);
}
.tile__k {
  font: 700 9px/1 ui-monospace, "SF Mono", Menlo, monospace;
  letter-spacing: .2em; text-transform: uppercase;
  color: var(--ink-dim);
}
.tile__v {
  margin-top: 7px; display: flex; align-items: baseline; gap: 4px;
  font: 750 21px/1 ui-monospace, "SF Mono", Menlo, monospace;
  font-variant-numeric: tabular-nums;
  color: #fff;
  text-shadow: 0 0 16px color-mix(in oklab, var(--c2) 45%, transparent);
}
.tile__v small { font-size: 10px; font-weight: 700; color: var(--ink-dim); letter-spacing: .06em; }
.tile__v--sm { font-size: 12.5px; letter-spacing: .02em; }

.spark { position: absolute; inset: auto 0 0 0; width: 100%; height: 30px; opacity: .85; }
.spark polyline {
  fill: none; stroke: var(--c2); stroke-width: 1.6;
  stroke-linejoin: round; stroke-linecap: round;
  vector-effect: non-scaling-stroke;
  filter: drop-shadow(0 0 5px var(--c2));
}

/* ── clock skew badge in the topbar ── */
.skew {
  display: flex; align-items: center; gap: 8px;
  padding: 7px 12px; border-radius: 999px;
  border: 1px solid var(--stroke);
  background: rgba(255,255,255,.05);
  backdrop-filter: blur(14px);
  font: 700 11px/1 ui-monospace, "SF Mono", Menlo, monospace;
  letter-spacing: .14em; text-transform: uppercase;
}
.skew__k { color: var(--ink-dim); }
.skew__v {
  font-variant-numeric: tabular-nums;
  color: color-mix(in oklab, var(--c2) 85%, white);
  text-shadow: 0 0 12px color-mix(in oklab, var(--c2) 60%, transparent);
}

.card__foot {
  margin-top: clamp(20px, 2.6vw, 28px);
  padding-top: 18px;
  border-top: 1px solid rgba(255,255,255,.1);
  display: flex; align-items: center; gap: 14px;
}
.sig {
  font: 750 15px/1 ui-monospace, "SF Mono", Menlo, monospace;
  letter-spacing: .03em;
  background: linear-gradient(94deg, var(--c2), #fff 70%);
  -webkit-background-clip: text; background-clip: text; color: transparent;
  filter: drop-shadow(0 2px 10px color-mix(in oklab, var(--c2) 60%, transparent));
}
.status {
  margin-left: auto; display: flex; align-items: center; gap: 8px;
  font: 600 11px/1 ui-sans-serif, system-ui, sans-serif;
  letter-spacing: .16em; text-transform: uppercase; color: var(--ink-dim);
}
.status__dot {
  width: 8px; height: 8px; border-radius: 50%; background: #4a5573;
}
.status[data-ok="1"] .status__dot { background: #3ddc97; box-shadow: 0 0 12px #3ddc97; animation: pulse 1.8s ease-in-out infinite; }
.status[data-ok="0"] .status__dot { background: #ff4d6d; box-shadow: 0 0 12px #ff4d6d; }

/* card swap choreography */
.card.is-out { animation: swapOut .34s cubic-bezier(.4,0,1,1) forwards; }
.card.is-in  { animation: swapIn  .58s cubic-bezier(.16,1,.3,1); }
@keyframes swapOut {
  to { opacity: 0; transform: translateZ(-160px) rotateY(-16deg) scale(.94); filter: blur(7px); }
}
@keyframes swapIn {
  from { opacity: 0; transform: translateZ(-120px) rotateY(18deg) scale(.95); filter: blur(6px); }
}

/* sparkle burst on swap */
.spark-bit {
  position: fixed; z-index: 5; width: 8px; height: 8px; pointer-events: none;
  border-radius: 50%;
  background: radial-gradient(circle, #fff 0 30%, var(--c2) 45%, transparent 70%);
  animation: fly var(--life) cubic-bezier(.15,.85,.25,1) forwards;
}
@keyframes fly {
  0%   { opacity: 1; transform: translate(0,0) scale(1); }
  100% { opacity: 0; transform: translate(var(--dx), var(--dy)) scale(.2) rotate(180deg); }
}

.hint {
  position: relative; z-index: 3;
  padding: 0 28px 22px; text-align: center;
  font-size: 11.5px; letter-spacing: .06em; color: rgba(154,166,196,.75);
}
kbd {
  font: 600 10.5px/1 ui-monospace, "SF Mono", Menlo, monospace;
  padding: 4px 7px; margin: 0 2px; border-radius: 6px;
  background: rgba(255,255,255,.07); border: 1px solid var(--stroke);
  color: var(--ink);
}

@media (max-width: 760px) {
  .topbar { flex-wrap: wrap; gap: 12px; padding: 16px; }
  .skew { display: none; }
  .rail { margin-left: 0; order: 3; width: 100%; overflow-x: auto; }
  .ring { display: none; }
  .hint { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .001ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
  .card { animation: none; }
}