/*
 * Intro screen before a game («заставка»): RoomPlay logo, game icon and name, the players, while the host
 * says the greeting; it leaves through a portal into the next screen. Markup and timing:
 * client/assets/js/game-intro.js. Colours come from the game's *-theme.css: --bg-primary, --bg-secondary,
 * --text-primary, --text-secondary, --rp-intro-accent (falls back to --rp-countdown-accent, then
 * --onboarding-accent) and --rp-intro-glow (falls back to --onboarding-accent). No emoji, no text of its own.
 */
@property --rp-intro-hole {
  syntax: '<length>';
  inherits: true;
  initial-value: 0px;
}

.rp-intro {
  --rp-in-accent: var(--rp-intro-accent, var(--rp-countdown-accent, var(--onboarding-accent, #a677ef)));
  --rp-in-glow: var(--rp-intro-glow, var(--onboarding-accent, var(--accent-primary, #6640ba)));
  --rp-in-ease: cubic-bezier(.2, .9, .3, 1.25);
  position: fixed;
  inset: 0;
  /* Over the «3 · 2 · 1» screen (995), which waits underneath and opens through the portal; below confirm dialogs (1000). */
  z-index: 996;
  overflow: hidden;
  color: var(--text-primary, #fff);
  font-family: var(--font-body, inherit);
  text-align: center;
  background:
    radial-gradient(ellipse at 50% 38%, color-mix(in srgb, var(--rp-in-glow) 55%, transparent) 0, transparent 58%),
    linear-gradient(180deg, var(--bg-secondary, #211759) 0%, var(--bg-primary, #100f36) 70%);
  opacity: 0;
  transition: opacity 240ms ease-out;
  user-select: none;
  -webkit-user-select: none;
}
.rp-intro.visible { opacity: 1; }

.rp-intro-backdrop { position: absolute; inset: 0; pointer-events: none; }
/* The rim of the portal: a glowing ring just outside the hole, growing with it. */
.rp-intro-portal {
  position: absolute;
  left: var(--rp-intro-x, 50%);
  top: var(--rp-intro-y, 40%);
  width: calc(var(--rp-intro-hole) * 2 + 16px);
  aspect-ratio: 1;
  translate: -50% -50%;
  border-radius: 50%;
  border: 5px solid var(--rp-in-accent);
  box-shadow: 0 0 24px 6px color-mix(in srgb, var(--rp-in-accent) 70%, transparent), inset 0 0 18px 2px color-mix(in srgb, var(--rp-in-accent) 60%, transparent);
  opacity: 0;
  pointer-events: none;
}
/* Spotlight rays turning slowly behind the icon. */
.rp-intro-rays {
  position: absolute;
  left: 50%;
  top: 38%;
  width: 190vmax;
  aspect-ratio: 1;
  translate: -50% -50%;
  background: repeating-conic-gradient(from 0deg, color-mix(in srgb, var(--rp-in-accent) 16%, transparent) 0deg 7deg, transparent 7deg 20deg);
  -webkit-mask: radial-gradient(circle, #000 0, rgba(0, 0, 0, .7) 18%, transparent 46%);
  mask: radial-gradient(circle, #000 0, rgba(0, 0, 0, .7) 18%, transparent 46%);
  opacity: 0;
}
/* Small sparks drifting up. */
.rp-intro-sparks {
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(circle, color-mix(in srgb, var(--rp-in-accent) 85%, #fff) 0 2px, transparent 3px),
    radial-gradient(circle, rgba(255, 255, 255, .55) 0 1.5px, transparent 2.5px);
  background-size: 140px 180px, 90px 110px;
  background-position: 20px 40px, 60px 10px;
  opacity: 0;
}

.rp-intro-stage {
  position: relative;
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: max(20px, env(safe-area-inset-top)) 16px max(36px, env(safe-area-inset-bottom));
  box-sizing: border-box;
}
/* Everything but the logo, centred in the space under it. */
.rp-intro-main {
  flex: 1;
  min-height: 0;
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: safe center;
  gap: clamp(10px, 2.4vh, 20px);
  padding-top: 12px;
}

.rp-intro-brand {
  flex: none;
  width: clamp(120px, 34vw, 170px);
  height: auto;
  /* The wordmark is white: a soft shadow keeps it readable on light palettes too. */
  filter: drop-shadow(0 2px 6px rgba(0, 0, 0, .35));
}

.rp-intro-hero {
  position: relative;
  width: clamp(130px, 40vw, 190px);
  aspect-ratio: 1;
  display: grid;
  place-items: center;
  perspective: 700px;
}
.rp-intro-icon {
  position: relative;
  width: 100%;
  height: 100%;
  border-radius: 28%;
  object-fit: cover;
  box-shadow:
    0 0 0 4px color-mix(in srgb, var(--rp-in-accent) 80%, transparent),
    0 18px 40px rgba(0, 0, 0, .45),
    0 0 60px color-mix(in srgb, var(--rp-in-accent) 45%, transparent);
}
.rp-intro-halo {
  position: absolute;
  inset: -8%;
  border-radius: 32%;
  border: 3px solid var(--rp-in-accent);
  opacity: 0;
}

.rp-intro-title {
  margin: 4px 0 0;
  max-width: 420px;
  font-family: var(--font-display, inherit);
  font-size: clamp(30px, 9vw, 46px);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -.01em;
  overflow-wrap: anywhere;
  text-shadow: 0 6px 0 rgba(0, 0, 0, .22);
}
.rp-intro-word { display: inline-block; white-space: nowrap; }
.rp-intro-letter { display: inline-block; }

/* Sound bars: shown while the host speaks. */
.rp-intro-voice {
  display: flex;
  align-items: center;
  gap: 4px;
  height: 22px;
  opacity: 0;
  transition: opacity 200ms ease;
}
.rp-intro-voice i {
  width: 4px;
  height: 100%;
  border-radius: 2px;
  background: var(--rp-in-accent);
  transform: scaleY(.25);
}
.rp-intro.speaking .rp-intro-voice { opacity: 1; }

.rp-intro-players {
  list-style: none;
  margin: clamp(6px, 2vh, 16px) 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px 10px;
  max-width: 460px;
}
.rp-intro-chip {
  display: inline-flex;
  align-items: center;
  max-width: 100%;
  padding: 6px 14px 6px 6px;
  border-radius: 999px;
  font-size: 16px;
  font-weight: 700;
  background: color-mix(in srgb, var(--text-primary, #fff) 12%, transparent);
  box-shadow: inset 0 0 0 1.5px color-mix(in srgb, var(--rp-in-accent) 50%, transparent);
}
.rp-intro-chip .rp-player { max-width: 40vw; }
.rp-intro-more { padding: 6px 14px; color: var(--text-secondary, rgba(255, 255, 255, .8)); }

/* How long until the game: fills over the intro's whole time. */
.rp-intro-progress {
  position: absolute;
  left: 50%;
  bottom: max(18px, env(safe-area-inset-bottom));
  width: min(56vw, 240px);
  height: 4px;
  translate: -50% 0;
  border-radius: 2px;
  overflow: hidden;
  background: color-mix(in srgb, var(--text-primary, #fff) 16%, transparent);
}
.rp-intro-progress span {
  display: block;
  height: 100%;
  background: var(--rp-in-accent);
  transform-origin: left;
  transform: scaleX(0);
}
/* An animation, not a transition: a transition is skipped (the bar jumps to full) when the page hasn't styled
   the bar before `.visible` lands, e.g. the intro arrives while the tab is in the background. */
.rp-intro.visible .rp-intro-progress span { animation: rp-intro-progress var(--rp-intro-ms, 4000ms) linear forwards; }

/* Short screens (landscape phones, small phones): smaller icon and name so the players still fit. */
@media (max-height: 600px) {
  .rp-intro-stage { padding-top: max(10px, env(safe-area-inset-top)); }
  .rp-intro-main { gap: 8px; padding-top: 6px; }
  .rp-intro-brand { width: 110px; }
  .rp-intro-hero { width: min(21vh, 150px); }
  .rp-intro-title { font-size: clamp(24px, 6vh, 34px); }
  .rp-intro-players { max-width: 640px; margin-top: 2px; }
}

@media (prefers-reduced-motion: no-preference) {
  /* ---- Entrance ---- */
  .rp-intro.visible .rp-intro-rays { animation: rp-intro-fade 900ms ease-out both, rp-intro-spin 24s linear infinite; }
  .rp-intro.visible .rp-intro-sparks { animation: rp-intro-fade 900ms ease-out 300ms both, rp-intro-drift 7s linear infinite; }
  .rp-intro.visible .rp-intro-brand { animation: rp-intro-brand-in 640ms var(--rp-in-ease) 80ms both; }
  .rp-intro.visible .rp-intro-icon { animation: rp-intro-icon-in 900ms cubic-bezier(.2, .8, .25, 1.15) 200ms both, rp-intro-float 2600ms ease-in-out 1100ms infinite; }
  .rp-intro.visible .rp-intro-halo { animation: rp-intro-halo 1800ms ease-out 900ms infinite; }
  .rp-intro.visible .rp-intro-halo.second { animation-delay: 1800ms; }
  .rp-intro.visible .rp-intro-letter { animation: rp-intro-letter-in 560ms var(--rp-in-ease) calc(620ms + var(--i) * 38ms) both; }
  .rp-intro.visible .rp-intro-chip { animation: rp-intro-deal 620ms var(--rp-in-ease) calc(1000ms + var(--i) * 110ms) both; }
  .rp-intro.speaking .rp-intro-voice i { animation: rp-intro-bar 700ms ease-in-out calc(var(--b) * -140ms) infinite alternate; }

  /* ---- Leaving: the portal ---- */
  .rp-intro.leaving {
    -webkit-mask: radial-gradient(circle at var(--rp-intro-x, 50%) var(--rp-intro-y, 40%), transparent var(--rp-intro-hole), #000 calc(var(--rp-intro-hole) + 1.5px));
    mask: radial-gradient(circle at var(--rp-intro-x, 50%) var(--rp-intro-y, 40%), transparent var(--rp-intro-hole), #000 calc(var(--rp-intro-hole) + 1.5px));
    animation: rp-intro-iris 620ms cubic-bezier(.65, 0, .35, 1) 200ms forwards;
  }
  .rp-intro.leaving .rp-intro-chip,
  .rp-intro.leaving .rp-intro-brand,
  .rp-intro.leaving .rp-intro-title,
  .rp-intro.leaving .rp-intro-voice {
    animation: rp-intro-fly 520ms cubic-bezier(.55, 0, .8, .2) both;
  }
  .rp-intro.leaving .rp-intro-chip { animation-delay: calc(var(--i) * 18ms); }
  .rp-intro.leaving .rp-intro-icon { animation: rp-intro-rush 820ms cubic-bezier(.6, -.25, .7, .2) both; }
  .rp-intro.leaving .rp-intro-halo { animation: rp-intro-shock 520ms ease-out both; }
  .rp-intro.leaving .rp-intro-halo.second { animation-delay: 90ms; }
  .rp-intro.leaving .rp-intro-rays { animation: rp-intro-spin-out 820ms ease-in both; }
  .rp-intro.leaving .rp-intro-progress { opacity: 0; transition: opacity 150ms; }
  .rp-intro.leaving .rp-intro-portal { opacity: 1; transition: opacity 120ms 200ms; }
}

@media (prefers-reduced-motion: reduce) {
  .rp-intro.visible .rp-intro-rays, .rp-intro.visible .rp-intro-sparks { opacity: 1; }
  .rp-intro.leaving { opacity: 0; transition-duration: 300ms; }
}

@keyframes rp-intro-progress { from { transform: scaleX(0); } to { transform: scaleX(1); } }
@keyframes rp-intro-fade { from { opacity: 0; } to { opacity: 1; } }
@keyframes rp-intro-spin { from { rotate: 0deg; } to { rotate: 360deg; } }
@keyframes rp-intro-drift { from { background-position: 20px 40px, 60px 10px; } to { background-position: 20px -320px, 60px -210px; } }
@keyframes rp-intro-brand-in {
  from { opacity: 0; transform: translateY(-40px) scale(.8); filter: blur(8px); }
  to { opacity: 1; transform: none; filter: blur(0); }
}
@keyframes rp-intro-icon-in {
  0% { opacity: 0; transform: rotateY(-540deg) rotateZ(-20deg) scale(.15); filter: brightness(2.2); }
  55% { opacity: 1; transform: rotateY(20deg) rotateZ(4deg) scale(1.14); filter: brightness(1.3); }
  78% { transform: rotateY(-8deg) rotateZ(-2deg) scale(.96); filter: brightness(1); }
  100% { opacity: 1; transform: none; }
}
@keyframes rp-intro-float { 0%, 100% { translate: 0 0; } 50% { translate: 0 -7px; } }
@keyframes rp-intro-halo { 0% { opacity: .9; transform: scale(.92); } 100% { opacity: 0; transform: scale(1.45); } }
@keyframes rp-intro-letter-in {
  0% { opacity: 0; transform: translateY(.9em) rotateX(90deg) scale(.6); }
  60% { opacity: 1; transform: translateY(-.12em) rotateX(-12deg) scale(1.08); }
  100% { opacity: 1; transform: none; }
}
@keyframes rp-intro-deal {
  0% { opacity: 0; transform: translateY(70px) rotate(var(--tilt)) scale(.6); }
  65% { opacity: 1; transform: translateY(-6px) rotate(calc(var(--tilt) * -.3)) scale(1.05); }
  100% { opacity: 1; transform: none; }
}
@keyframes rp-intro-bar { from { transform: scaleY(.25); } to { transform: scaleY(1); } }
@keyframes rp-intro-fly {
  to { opacity: 0; transform: translate(var(--fly-x, 0), var(--fly-y, -60vh)) rotate(var(--tilt, 12deg)) scale(.7); filter: blur(4px); }
}
@keyframes rp-intro-rush {
  0% { transform: none; }
  22% { transform: scale(.82) rotate(-6deg); filter: brightness(1.2); }
  100% { transform: scale(9) rotate(12deg); filter: brightness(2) blur(2px); opacity: 0; }
}
@keyframes rp-intro-shock { 0% { opacity: 1; transform: scale(1); border-width: 6px; } 100% { opacity: 0; transform: scale(4); border-width: 1px; } }
@keyframes rp-intro-spin-out { to { rotate: 160deg; scale: 1.6; opacity: 0; } }
@keyframes rp-intro-iris { from { --rp-intro-hole: 0px; } to { --rp-intro-hole: 150vmax; } }