:root {
  --bg: #000;
  --fg: #fff;
  --muted: #9aa0a6;
  --tile: #141414;
  --tile-active: #1f1f1f;
  --blue: #4285F4;
  --red: #EA4335;
  --yellow: #FBBC04;
  --green: #34A853;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: "Google Sans Text", -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  background: var(--bg);
  color: var(--fg);
  min-height: 100dvh;
  -webkit-tap-highlight-color: transparent;
  overscroll-behavior: none;
}

.app {
  display: flex; flex-direction: column;
  min-height: 100dvh;
  padding:
    calc(env(safe-area-inset-top) + 1.25rem)
    env(safe-area-inset-right)
    calc(env(safe-area-inset-bottom) + 1rem)
    env(safe-area-inset-left);
  gap: 0;
}

/* ----- Brand header ----- */
.brand {
  text-align: center;
  padding: 0 1.25rem 0;
}
.brand-row {
  display: flex; gap: 0.4rem; justify-content: center; margin-bottom: 0.75rem;
}
.dot { width: 0.6rem; height: 0.6rem; border-radius: 50%; }
.dot-blue { background: var(--blue); }
.dot-red { background: var(--red); }
.dot-yellow { background: var(--yellow); }
.dot-green { background: var(--green); }

.brand h1 {
  font-family: "Google Sans", system-ui, sans-serif;
  font-weight: 700;
  font-size: clamp(1.75rem, 7vw, 2.5rem);
  margin: 0;
  letter-spacing: -0.02em;
  line-height: 1.05;
}
.brand .subtitle {
  margin: 0.25rem 0 0;
  color: var(--muted);
  font-size: 0.85rem;
  letter-spacing: 0.02em;
}

/* ----- Challenges (primary) ----- */
.challenges {
  padding: 1.5rem 1.25rem 0;
  display: flex; flex-direction: column; gap: 1rem;
}
.card {
  background: var(--tile);
  border-radius: 1.1rem;
  padding: 1.25rem 1.25rem 1.4rem;
  position: relative;
  border-left: 4px solid var(--muted);
}
.card-blue   { border-left-color: var(--blue); }
.card-red    { border-left-color: var(--red); }
.card-yellow { border-left-color: var(--yellow); }
.card-green  { border-left-color: var(--green); }

.card .pill {
  display: inline-block;
  font-family: "Google Sans", system-ui, sans-serif;
  font-weight: 700;
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  padding: 0.35rem 0.6rem;
  border-radius: 999px;
  background: rgba(255,255,255,0.06);
  color: var(--fg);
  margin-bottom: 0.75rem;
}
.card-blue   .pill { color: var(--blue);   background: rgba(66,133,244,0.12); }
.card-red    .pill { color: var(--red);    background: rgba(234,67,53,0.12); }
.card-yellow .pill { color: var(--yellow); background: rgba(251,188,4,0.14); }
.card-green  .pill { color: var(--green);  background: rgba(52,168,83,0.12); }

.card h2 {
  font-family: "Google Sans", system-ui, sans-serif;
  font-weight: 700;
  font-size: 1.15rem;
  margin: 0 0 0.6rem;
  line-height: 1.25;
  letter-spacing: -0.01em;
}
.card p {
  margin: 0;
  color: #d7d8db;
  font-size: 0.95rem;
  line-height: 1.5;
}

/* ----- Reactions (secondary) ----- */
.reactions {
  margin-top: 1.5rem;
  padding: 1rem 1.25rem 0.5rem;
  border-top: 1px solid rgba(255,255,255,0.08);
}
.r-head {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 0.6rem;
}
.r-label {
  font-family: "Google Sans", system-ui, sans-serif;
  font-weight: 700;
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
}
.status {
  font-size: 0.7rem; color: var(--muted);
  letter-spacing: 0.12em; text-transform: uppercase;
}
.status.live::before {
  content: ""; display: inline-block;
  width: 0.4rem; height: 0.4rem;
  background: var(--green); border-radius: 50%;
  margin-right: 0.4rem; vertical-align: middle;
  box-shadow: 0 0 6px var(--green);
}
.status:not(.live) { color: var(--red); }

.r-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 0.55rem;
}
.btn {
  appearance: none; border: 0; outline: 0;
  background: var(--tile);
  color: var(--fg);
  aspect-ratio: 1 / 1;
  border-radius: 0.85rem;
  font-size: 1.7rem;
  cursor: pointer; user-select: none;
  transition: transform 0.08s ease, background 0.15s ease;
}
.btn:active { transform: scale(0.92); background: var(--tile-active); }
.btn.burst { animation: burst 0.4s ease-out; }
@keyframes burst {
  0% { transform: scale(1); }
  40% { transform: scale(1.15); }
  100% { transform: scale(1); }
}
.r-note {
  margin: 0.7rem 0 0;
  text-align: center;
  color: var(--muted);
  font-size: 0.75rem;
}

/* ----- Footer ----- */
.foot {
  margin-top: auto;
  padding: 1.25rem 1.25rem 0;
  color: var(--muted);
  font-size: 0.7rem;
  text-align: center;
  letter-spacing: 0.08em;
}