/* =====================================================================
   Lights Out: an old picture house's marquee, after the last show.
   The page is the front of the house: peacock-glazed tiles with chrome
   trim, the name in lights over a milk-glass letterboard, and the sign
   itself, black lacquer studded with big bulbs inside a ring of chaser
   lights. The only warm light is the bulbs'; the rest is glaze, chrome,
   black and white glass. game.js lights the bulbs (.bulb.on) and puts
   the whole front out when the last one goes (#front.dark).
   ===================================================================== */

:root {
  --tile: #0e4a50;
  --tile-hi: #176a70;
  --tile-dk: #06282c;
  --lacquer: #0a0d0e;
  --chrome: #cfd8db;
  --chrome-dk: #6c797d;
  --aqua: #86e6da;
  --glass: #f4f7f3;       /* the letterboard's milk glass, lit from behind */
  --lamp-hi: #fff3cf;     /* bulb light */
  --ink: #e6f3f0;
  --dim: #9cc5c0;
  --display: "Limelight", "Broadway", Georgia, serif;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html, body { height: 100%; }

body {
  font-family: "Jost", "Century Gothic", "Futura", system-ui, sans-serif;
  color: var(--ink);
  overflow: hidden;
  background:
    /* night closing in at the edges */
    radial-gradient(ellipse 85% 80% at 50% 48%, transparent 40%, rgba(1, 12, 14, 0.78) 100%),
    /* tile seams, then the line of light along each */
    repeating-linear-gradient(0deg, rgba(0, 0, 0, 0.3) 0 2px, transparent 2px 88px),
    repeating-linear-gradient(90deg, rgba(0, 0, 0, 0.3) 0 2px, transparent 2px 176px),
    repeating-linear-gradient(0deg, transparent 0 2px, rgba(255, 255, 255, 0.05) 2px 3px, transparent 3px 88px),
    repeating-linear-gradient(90deg, transparent 0 2px, rgba(255, 255, 255, 0.04) 2px 3px, transparent 3px 176px),
    linear-gradient(180deg, var(--tile-hi), var(--tile) 45%, var(--tile-dk));
}

.nav-back-games {
  position: fixed; top: 16px; left: 18px; z-index: 50;
  font-family: inherit; font-size: 15px;
  color: var(--ink); text-decoration: none;
  background: rgba(8, 22, 24, 0.9);
  border: 1px solid #2f8a8c; border-radius: 4px;
  padding: 5px 12px;
}
.nav-back-games:hover { border-color: var(--aqua); color: #fff; }

/* ---- the front: name, letterboard, HUD ------------------------------- */

#front {
  height: 100%;
  display: flex; flex-direction: column; align-items: center;
  padding: 12px 14px 16px;
  overflow: hidden;                   /* an edge bulb's pool of light stops at the page */
}
/* the sign's light on the tiles, and a fan of rays pressed into them */
#front::before, #front::after {
  content: ""; position: fixed; z-index: -1; pointer-events: none;
}
#front::before {
  inset: 0;
  background: radial-gradient(ellipse 58% 46% at 50% 60%, rgba(255, 190, 100, 0.15), transparent 72%);
}
#front::after {
  left: 0; right: 0; top: -30px; height: 540px;
  background: repeating-conic-gradient(from 178.5deg at 50% 0, rgba(190, 255, 245, 0.075) 0 3deg, transparent 3deg 12deg);
  -webkit-mask-image: radial-gradient(ellipse min(550px, 80vw) 100% at 50% 0, #000 18%, transparent 76%);
  mask-image: radial-gradient(ellipse min(550px, 80vw) 100% at 50% 0, #000 18%, transparent 76%);
}
#front.dark::before { opacity: 0; }

#head { display: flex; flex-direction: column; align-items: center; }

.sign {
  margin-top: 2px; text-align: center;
  padding: 5px 28px 10px;
  background: linear-gradient(180deg, #151b1c, var(--lacquer));
  border-radius: 8px;
  box-shadow:
    0 0 0 1px var(--chrome-dk),
    0 0 0 4px #0c1011,
    0 0 0 5px var(--chrome),
    0 8px 22px rgba(0, 0, 0, 0.55);
}
.sign h1 {
  font-family: var(--display); font-weight: 400;
  font-size: 34px; letter-spacing: 4px; line-height: 1.2;
  color: var(--lamp-hi);
  text-shadow: 0 0 5px rgba(255, 226, 160, 0.95), 0 0 16px rgba(255, 180, 80, 0.7), 0 0 34px rgba(255, 150, 50, 0.4);
}
/* changeable black letters on rails, over glass lit from behind */
.letterboard {
  position: relative; overflow: hidden;
  min-width: min(290px, 70vw); margin-top: 3px;
  padding: 5px 16px 4px;
  font-size: 13px; font-weight: 700; letter-spacing: 3px; line-height: 1.25;
  text-transform: uppercase; white-space: nowrap; color: #111617;
  background:
    repeating-linear-gradient(0deg, rgba(0, 0, 0, 0.1) 0 1px, transparent 1px 8px),
    linear-gradient(180deg, #fbfdfa, #dce5e1);
  border: 2px solid #050707; border-radius: 3px;
  box-shadow: 0 0 0 1px var(--chrome-dk), 0 0 16px rgba(230, 255, 248, 0.3);
}
.letterboard::after {
  content: ""; position: absolute; inset: 0;
  background: rgba(10, 18, 19, 0.52); opacity: 0;
}
/* the last bulb out takes the name and the letterboard's lamps with it */
#front.dark .sign h1 { color: #56625f; text-shadow: none; }
#front.dark .letterboard { box-shadow: 0 0 0 1px var(--chrome-dk); }
#front.dark .letterboard::after { opacity: 1; }

.hudline {
  display: flex; gap: 18px; align-items: baseline;
  margin-top: 13px; font-size: 15px; color: var(--dim);
}
.hudline[hidden] { visibility: hidden; }
.hudline #hud-moves { color: var(--ink); font-size: 17px; font-weight: 600; }
.hudline #hud-mode { letter-spacing: 2px; text-transform: uppercase; font-size: 12.5px; }
.hudline button {
  font-family: inherit; font-size: 13px; letter-spacing: 1px; cursor: pointer;
  color: var(--aqua); background: rgba(6, 30, 33, 0.6);
  border: 1px solid #2f8a8c; border-radius: 4px; padding: 2px 11px;
}
.hudline button:hover { border-color: var(--aqua); }

/* the reel: the last reel's move budget, a strip of film running out */
.reel {
  position: relative; width: min(360px, 82vw); height: 16px; margin: 8px 0 17px;
  background: #050707; border-radius: 2px;
  box-shadow: 0 0 0 1px rgba(207, 216, 219, 0.3);
}
.reel-film {
  height: 100%;
  background:
    /* sprocket holes along both edges, then the frames */
    repeating-linear-gradient(90deg, transparent 0 3px, rgba(232, 243, 240, 0.85) 3px 6px, transparent 6px 9px) 0 1.5px / 100% 2px no-repeat,
    repeating-linear-gradient(90deg, transparent 0 3px, rgba(232, 243, 240, 0.85) 3px 6px, transparent 6px 9px) 0 calc(100% - 1.5px) / 100% 2px no-repeat,
    repeating-linear-gradient(90deg, #0d1112 0 2px, #a3b9b8 2px 16px, #0d1112 16px 18px) 0 50% / 100% 7px no-repeat,
    #1a2021;
  transition: width 0.25s ease;
}
.reel-label { position: absolute; right: 0; top: 19px; font-size: 12px; color: var(--dim); letter-spacing: 1px; }

/* ---- the sign: a board of bulbs ---------------------------------------- */

#board {
  --frame: 18px;                      /* the chaser's border (game.js sets it) */
  position: relative; isolation: isolate;
  display: grid; gap: var(--gap, 10px);
  margin: auto 0;
  padding: var(--frame);
  border-radius: 12px;
  background: linear-gradient(155deg, rgba(255, 255, 255, 0.07), transparent 28%), var(--lacquer);
  box-shadow:
    0 0 0 1px #1d2526,
    0 0 0 3px var(--chrome),
    0 0 0 4px #39474a,
    0 0 0 8px #0b0f10,
    0 0 0 9px var(--chrome-dk),
    0 18px 44px rgba(0, 0, 0, 0.6);
}
/* the field the bulbs stand on, set in from the chaser's channel */
#board::before {
  content: ""; position: absolute; inset: calc(var(--frame) - 3px); z-index: -1;
  border: 1px solid rgba(207, 216, 219, 0.2); border-radius: 6px;
  background: radial-gradient(ellipse at 50% 45%, #121718, #060808);
  pointer-events: none;
}

button.bulb {
  position: relative;
  width: var(--cw, 96px); height: var(--cw, 96px);
  border: 0; padding: 0; background: none; cursor: pointer; border-radius: 50%;
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
}
button.bulb > svg, .bulb .lit, .bulb .lit svg {
  position: absolute; inset: 0; width: 100%; height: 100%; display: block;
}
button.bulb:focus { outline: none; }
button.bulb:focus-visible::after {
  content: ""; position: absolute; inset: -3px; border-radius: 50%;
  border: 2px dashed var(--aqua); pointer-events: none;
}
button.bulb:active { transform: scale(0.96); }

/* A lit bulb is the same bulb with its burning self faded in over it, and
   a pool of light under every bulb on the sign (z-index -1 inside #board's
   own stacking context: over the field, under the sockets). */
.bulb .lit, .bulb .glow { opacity: 0; pointer-events: none; }
.bulb .glow {
  position: absolute; inset: -44%; z-index: -1; border-radius: 50%;
  background: radial-gradient(closest-side, rgba(255, 200, 112, 0.6), rgba(255, 164, 64, 0.24) 46%, rgba(255, 140, 40, 0) 100%);
}
.bulb.on .lit, .bulb.on .glow { opacity: 1; }
/* Visual FX on: a filament takes a moment to warm, and longer to cool */
body.fxon .bulb .lit, body.fxon .bulb .glow { transition: opacity 0.36s ease-in; }
body.fxon .bulb.on .lit, body.fxon .bulb.on .glow { transition: opacity 0.15s ease-out; }

/* a hint: the bulb to press glints, cool against the lamplight */
.bulb.glint { animation: glint 0.9s ease 3; }
@keyframes glint {
  0%, 100% { filter: drop-shadow(0 0 0 rgba(134, 230, 218, 0)); }
  50% { filter: drop-shadow(0 0 7px rgba(190, 255, 247, 1)) drop-shadow(0 0 18px rgba(134, 230, 218, 0.95)); }
}
/* Visual FX off: the glint holds at its brightest, still, until game.js
   clears it (2.75s, when the three glints would have finished) */
body:not(.fxon) .bulb.glint {
  animation: none;
  filter: drop-shadow(0 0 7px rgba(190, 255, 247, 1)) drop-shadow(0 0 18px rgba(134, 230, 218, 0.95));
}

/* The chaser (art.js): every third bulb dims in turn, so a gap runs round
   the sign. Visual FX off: all of them lit, still. */
.chase { position: absolute; inset: 0; width: 100%; height: 100%; pointer-events: none; }
#front.dark .chase .lights { opacity: 0; }
body.fxon .chase .ph { animation: chase 1.8s linear infinite; }
body.fxon .chase .ph1 { animation-delay: -1.2s; }
body.fxon .chase .ph2 { animation-delay: -0.6s; }
@keyframes chase {
  0%, 52%, 100% { opacity: 1; }
  64%, 86% { opacity: 0.1; }
}

/* Visual FX on: the front goes dark, and comes back, over half a second */
body.fxon .sign h1 { transition: color 0.5s ease, text-shadow 0.5s ease; }
body.fxon .letterboard, body.fxon .letterboard::after, body.fxon #front::before, body.fxon .chase .lights {
  transition: opacity 0.5s ease, box-shadow 0.5s ease;
}

/* ---- panels ------------------------------------------------------------ */

.panel {
  position: fixed; inset: 0; z-index: 30;
  display: flex; align-items: center; justify-content: center;
  padding: 26px 16px; overflow-y: auto;
  background: rgba(2, 14, 16, 0.62);
}
.panel[hidden] { display: none; }

.card {
  width: min(430px, 100%);
  background: linear-gradient(180deg, #141b1c, var(--lacquer));
  border-radius: 10px;
  box-shadow:
    0 0 0 1px var(--chrome-dk),
    0 0 0 4px #0c1011,
    0 0 0 5px rgba(207, 216, 219, 0.8),
    0 14px 44px rgba(0, 0, 0, 0.65);
  padding: 22px 24px 20px;
}
.card h2 {
  font-family: var(--display); font-weight: 400;
  font-size: 27px; letter-spacing: 1.5px; line-height: 1.2;
  color: var(--lamp-hi); text-shadow: 0 0 14px rgba(255, 190, 100, 0.45);
  margin-bottom: 10px;
}
.card .how { font-size: 15.5px; line-height: 1.5; color: var(--ink); margin-bottom: 16px; }
.card .how b { color: var(--aqua); font-weight: 600; }

.pick .seg { display: flex; flex-direction: column; gap: 7px; margin-bottom: 10px; }
.pick .seg.sizes { flex-direction: row; }
.pick .seg[hidden] { display: none; }
.seg button {
  font-family: inherit; font-size: 16px; text-align: left; cursor: pointer;
  color: var(--ink); background: rgba(134, 230, 218, 0.05);
  border: 1px solid #235e62; border-radius: 7px; padding: 8px 12px;
  display: flex; align-items: baseline; justify-content: space-between; gap: 10px;
}
.seg button b { font-weight: 600; letter-spacing: 0.5px; }
.seg.sizes button { flex: 1; justify-content: center; }
.seg button small { font-size: 12.5px; color: var(--dim); }
.seg button.on { border-color: var(--aqua); background: rgba(134, 230, 218, 0.15); }
.seg button.on b { color: var(--aqua); }

kbd {
  font-family: inherit; font-size: 11.5px; letter-spacing: 0; text-transform: none;
  background: #1d5a5e; color: var(--ink);
  border-radius: 4px; padding: 1px 6px;
}

/* the way in is a strip of the letterboard */
.playbtn, .card .row button:first-child {
  font-family: inherit; font-weight: 700; letter-spacing: 3px; text-transform: uppercase;
  cursor: pointer; color: #111617;
  background:
    repeating-linear-gradient(0deg, rgba(0, 0, 0, 0.09) 0 1px, transparent 1px 11px),
    linear-gradient(180deg, #fbfdfa, #dce5e1);
  border: 2px solid #050707; border-radius: 5px;
  box-shadow: 0 0 0 1px var(--chrome-dk), 0 0 16px rgba(230, 255, 248, 0.26);
}
.playbtn { font-size: 17px; width: 100%; padding: 11px 10px 10px; margin-top: 6px; }
.playbtn:hover { filter: brightness(1.06); }
.playbtn:active { transform: translateY(1px); }
.playbtn kbd, .card .row button:first-child kbd { background: rgba(17, 22, 23, 0.16); color: #111617; }

.bests { margin-top: 12px; font-size: 13.5px; color: var(--dim); min-height: 18px; text-align: center; }

.card .big { font-family: var(--display); font-size: 31px; color: var(--ink); margin: 4px 0 6px; }
.card .stats { font-size: 14.5px; color: var(--dim); margin-bottom: 16px; white-space: pre-line; line-height: 1.5; }
.card .row { display: flex; gap: 10px; flex-wrap: wrap; }
.card .row button {
  font-family: inherit; font-size: 16px; cursor: pointer;
  color: var(--ink); background: rgba(134, 230, 218, 0.05);
  border: 1px solid #235e62; border-radius: 5px; padding: 8px 18px;
}
.card .row button:first-child { font-size: 14px; letter-spacing: 2px; padding: 8px 16px; }
.card .row button:hover { filter: brightness(1.1); }

@media (max-width: 640px) {
  .sign { margin-top: 46px; padding: 3px 16px 8px; }   /* clear of the corner buttons */
  .sign h1 { font-size: 24px; letter-spacing: 3px; }
  .letterboard { font-size: 11.5px; letter-spacing: 2.5px; min-width: min(230px, 66vw); }
  .hudline { gap: 12px; font-size: 13.5px; margin-top: 11px; }
  .card h2 { font-size: 22px; }
  .card .big { font-size: 25px; }
}