:root {
  --bg: #0e7c7b;
  --bg2: #17b0ad;
  --card: #ffffff;
  --ink: #0f2d2c;
  --muted: #5a7a79;
  --accent: #ff7a59;
  --go: #1faa59;
  --stop: #e0413e;
  --sel: #fff4ec;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--ink);
  background: linear-gradient(160deg, var(--bg), var(--bg2));
  min-height: 100vh;
}

header {
  text-align: center;
  padding: 2.25rem 1rem 0.5rem;
  color: #fff;
}
header h1 { margin: 0; font-size: clamp(2rem, 5vw, 3rem); }
.tagline { margin: 0.5rem auto 0; max-width: 40rem; font-size: 1.05rem; opacity: 0.92; }

/* Controls -------------------------------------------------------------- */
.controls {
  position: sticky;
  top: 0;
  z-index: 5;
  text-align: center;
  padding: 0.9rem 1rem;
  background: rgba(8, 70, 69, 0.55);
  backdrop-filter: blur(6px);
}
.control-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  justify-content: center;
}
.btn {
  border: none;
  border-radius: 999px;
  padding: 0.6rem 1.2rem;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  color: #fff;
  box-shadow: 0 4px 12px rgba(0,0,0,0.18);
  transition: transform 0.08s ease, opacity 0.2s ease;
}
.btn:hover { transform: translateY(-1px); }
.btn:disabled { opacity: 0.45; cursor: not-allowed; transform: none; }
.btn-go { background: var(--go); }
.btn-stop { background: var(--stop); }
.btn-mini { background: rgba(255,255,255,0.18); font-weight: 500; padding: 0.6rem 1rem; }
.status {
  margin: 0.75rem 0 0;
  color: #eaffff;
  font-size: 1.05rem;
  min-height: 1.4em;
  font-variant-numeric: tabular-nums;
}

/* Grid ------------------------------------------------------------------ */
main {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 1.25rem;
  max-width: 1200px;
  margin: 0 auto;
  padding: 1.5rem;
}

.card {
  background: var(--card);
  border-radius: 16px;
  padding: 1rem 1.25rem 0.75rem;
  box-shadow: 0 10px 24px rgba(0,0,0,0.15);
  border: 3px solid transparent;
  transition: border-color 0.15s ease, box-shadow 0.15s ease, background 0.15s ease;
}
.card.selected { border-color: var(--accent); background: var(--sel); }
.card.playing {
  border-color: var(--go);
  box-shadow: 0 0 0 4px rgba(31,170,89,0.35), 0 10px 24px rgba(0,0,0,0.2);
}

.card-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
}
.select-label {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  font-size: 1.1rem;
  font-weight: 600;
  cursor: pointer;
  user-select: none;
  flex: 1 1 auto;
  min-width: 0;
}
.lang-check { width: 1.2rem; height: 1.2rem; cursor: pointer; accent-color: var(--accent); flex: none; }
.flag { font-size: 1.4rem; }

/* Expand/collapse toggle */
.toggle {
  flex: none;
  background: #eef3f3;
  border: none;
  border-radius: 999px;
  padding: 0.3rem 0.7rem;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--muted);
  cursor: pointer;
  white-space: nowrap;
}
.toggle:hover { background: #e2eceb; color: var(--ink); }
.toggle .caret { display: inline-block; transition: transform 0.15s ease; }
.card.open .toggle .caret { transform: rotate(90deg); }

/* Number list — collapsed by default, revealed when the card is open */
.card .numbers {
  margin: 0;
  padding: 0;
  max-height: 0;
  overflow: hidden;
  list-style: none;
  transition: max-height 0.2s ease;
}
.card.open .numbers {
  max-height: 600px;
  margin-top: 0.75rem;
  padding-left: 1.6rem;
  padding-top: 0.6rem;
  border-top: 2px solid #eef3f3;
  list-style: decimal;
  columns: 2;
  column-gap: 1.25rem;
}
.card li { margin: 0.2rem 0; font-size: 0.98rem; break-inside: avoid; }
.card li::marker { color: var(--muted); font-variant-numeric: tabular-nums; }

/* Voice male/female toggle */
.voice-label { color: #eaffff; font-weight: 600; align-self: center; }
.voice-toggle {
  display: inline-flex;
  background: rgba(255,255,255,0.18);
  border-radius: 999px;
  padding: 0.2rem;
}
.voice-opt {
  border: none;
  background: transparent;
  color: #eaffff;
  font-size: 0.95rem;
  font-weight: 600;
  padding: 0.4rem 1rem;
  border-radius: 999px;
  cursor: pointer;
}
.voice-opt.active { background: var(--accent); color: #fff; box-shadow: 0 2px 8px rgba(0,0,0,0.2); }

footer {
  text-align: center;
  color: #eaffff;
  padding: 0.5rem 1rem 2.5rem;
  opacity: 0.9;
}

/* Mobile ---------------------------------------------------------------- */
@media (max-width: 600px) {
  header { padding: 1.5rem 0.75rem 0.4rem; }
  .tagline { font-size: 0.95rem; }

  .controls { padding: 0.7rem 0.6rem; }
  .control-row { gap: 0.45rem; }
  .btn {
    padding: 0.6rem 0.9rem;
    font-size: 0.95rem;
    flex: 1 1 auto;          /* fill the row, big tap targets */
    min-width: 7.5rem;
  }
  .btn-go, .btn-stop { flex-basis: 45%; }
  .btn-mini { min-width: 6rem; }
  .status { font-size: 0.95rem; }

  main {
    grid-template-columns: 1fr;   /* one card per row */
    gap: 1rem;
    padding: 1rem 0.85rem 2rem;
  }
  .card { padding: 0.9rem 1rem 0.6rem; }
  .select-label { font-size: 1.05rem; }
  .lang-check { width: 1.4rem; height: 1.4rem; }  /* easier to tap */
  .card.open .numbers { padding-left: 1.4rem; }
}

/* Respect users who prefer fewer animations */
@media (prefers-reduced-motion: reduce) {
  .btn, .card { transition: none; }
}