:root {
  --ink: #e8f4f2;
  --muted: #8eb0a8;
  --deep: #0a1a18;
  --tile: #f4f7f2;
  --cobalt: #1e5c8a;
  --teal: #1f8a7f;
  --gold: #d4a017;
  --panel: rgba(8, 28, 26, 0.92);
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html, body {
  width: 100%;
  height: 100%;
  overflow: hidden;
  background: var(--deep);
  color: var(--ink);
  font-family: "Outfit", sans-serif;
  user-select: none;
  touch-action: none;
}

.hidden { display: none !important; }

.panel {
  position: fixed;
  inset: 0;
  z-index: 5;
  display: grid;
  place-content: center;
  gap: 0.75rem;
  padding: 1.5rem;
  background:
    radial-gradient(ellipse 60% 45% at 20% 15%, rgba(31, 138, 127, 0.28), transparent 55%),
    radial-gradient(ellipse 50% 40% at 85% 80%, rgba(30, 92, 138, 0.28), transparent 50%),
    var(--deep);
}

.back {
  position: absolute;
  top: 1rem;
  left: 1rem;
  color: var(--muted);
  text-decoration: none;
  font-weight: 700;
  font-size: 0.85rem;
}

.panel h1,
.overlay h2 {
  font-family: "Space Grotesk", sans-serif;
  font-size: clamp(2.2rem, 7vw, 3.4rem);
  letter-spacing: -0.03em;
  text-align: center;
  background: linear-gradient(120deg, var(--gold), #7ee0b8, #3aa9ff);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.tag, .hint, #overlay-msg {
  text-align: center;
  color: var(--muted);
  max-width: 26rem;
  justify-self: center;
  line-height: 1.4;
}

.hint { font-size: 0.9rem; }

#play-btn,
#next-btn,
#menu-btn,
#shuffle-btn {
  font-family: "Space Grotesk", sans-serif;
  font-weight: 700;
  border: none;
  border-radius: 10px;
  cursor: pointer;
}

#play-btn,
#next-btn {
  font-size: 1.05rem;
  padding: 0.85rem 1.4rem;
  color: #0a1a18;
  background: linear-gradient(135deg, var(--gold), var(--teal));
  justify-self: center;
}

#menu-btn {
  padding: 0.7rem 1.2rem;
  background: transparent;
  color: var(--ink);
  border: 1px solid rgba(255, 255, 255, 0.2);
  justify-self: center;
}

#board {
  display: block;
  width: 100vw;
  height: 100vh;
  cursor: pointer;
}

.hud {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 4;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  padding: 0.75rem 1rem;
  pointer-events: none;
  font-weight: 700;
}

#shuffle-btn {
  pointer-events: auto;
  padding: 0.45rem 0.8rem;
  font-size: 0.8rem;
  color: var(--ink);
  background: var(--panel);
  border: 1px solid rgba(126, 224, 184, 0.25);
}

.overlay {
  z-index: 6;
  background: rgba(10, 26, 24, 0.9);
  place-content: start center;
  align-content: start;
  overflow-y: auto;
  overflow-x: hidden;
  -webkit-overflow-scrolling: touch;
  padding: 1rem 1rem 2.5rem;
}

.overlay #fb-root {
  width: min(440px, 94vw);
  margin: 0 auto;
  max-width: 100%;
}

.lang-corner {
  position: fixed;
  top: 1rem;
  right: 1rem;
  z-index: 40;
}

html[dir="rtl"] .lang-corner {
  right: auto;
  left: 1rem;
}

.flag-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.4rem 0.55rem;
  border-radius: 999px;
  border: 1px solid rgba(31, 138, 127, 0.4);
  background: rgba(8, 28, 26, 0.9);
  cursor: pointer;
}

.flag-img,
.flag-option img {
  display: block;
  width: 28px;
  height: 20px;
  object-fit: cover;
  border-radius: 3px;
}

.flag-caret {
  width: 0;
  height: 0;
  border-left: 4px solid transparent;
  border-right: 4px solid transparent;
  border-top: 5px solid var(--muted);
}

.flag-menu {
  position: absolute;
  top: calc(100% + 0.45rem);
  right: 0;
  min-width: 11.5rem;
  max-height: min(70vh, 22rem);
  overflow: auto;
  padding: 0.35rem;
  border-radius: 12px;
  background: rgba(8, 28, 26, 0.96);
  border: 1px solid rgba(31, 138, 127, 0.35);
}

.flag-option {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 0.65rem;
  padding: 0.45rem 0.55rem;
  border: none;
  border-radius: 8px;
  background: transparent;
  color: var(--ink);
  font-family: "Outfit", sans-serif;
  font-size: 0.88rem;
  font-weight: 600;
  cursor: pointer;
}

.flag-option:hover,
.flag-option.is-active {
  background: rgba(31, 138, 127, 0.2);
}