/* ============================================================================
   Tech Acronym Battle — .acro-* namespace
   Accent: #9B59B6 (Amethyst)
   ============================================================================ */
:root { --acro-accent: #9B59B6; }

.acro-page { max-width: 650px; margin: 0 auto; padding: 0 1rem 3rem; }

/* ── Tabs ─────────────────────────────────────────────────────────────────── */
.acro-tabs {
  display: flex; gap: 0.5rem; padding: 0.35rem;
  background: rgba(255,255,255,0.04); border: 1px solid rgba(255,255,255,0.08);
  border-radius: 12px; margin-bottom: 1.5rem;
}
.acro-tab {
  background: none; border: 1px solid transparent; color: rgba(255,255,255,0.5);
  font-size: 0.85rem; font-weight: 600; padding: 0.6rem 1.1rem; cursor: pointer;
  border-radius: 8px; transition: all 0.2s ease; flex: 1; text-align: center;
}
.acro-tab:hover { color: #fff; background: rgba(255,255,255,0.06); }
.acro-tab.active {
  color: #fff; background: var(--acro-accent); border-color: var(--acro-accent);
  box-shadow: 0 2px 8px rgba(155,89,182,0.3);
}
.acro-panel { display: none; }
.acro-panel.active { display: block; }

/* ── Lobby ─────────────────────────────────────────────────────────────────── */
.acro-lobby { padding-top: 0.5rem; }

/* Ticker */
.acro-ticker {
  overflow: hidden; margin-bottom: 1.5rem; height: 1.4rem;
  -webkit-mask-image: linear-gradient(90deg, transparent, #000 10%, #000 90%, transparent);
  mask-image: linear-gradient(90deg, transparent, #000 10%, #000 90%, transparent);
}
.acro-ticker-track {
  display: flex; gap: 1.8rem; white-space: nowrap;
  animation: acro-scroll 45s linear infinite;
}
.acro-ticker-track span {
  font-family: 'JetBrains Mono', 'Fira Code', monospace;
  font-weight: 700; font-size: 0.82rem; letter-spacing: 2px;
  color: rgba(155,89,182,0.25);
}
.acro-ticker-track span:nth-child(3n) { color: rgba(155,89,182,0.35); }
@keyframes acro-scroll {
  from { transform: translateX(0); }
  to { transform: translateX(-50%); }
}

/* Returning player stats */
.acro-lobby-stats {
  display: flex; justify-content: center; gap: 1rem; margin-bottom: 1.5rem;
  padding: 0.6rem 1rem; background: rgba(255,255,255,0.03);
  border: 1px solid rgba(255,255,255,0.06); border-radius: 10px;
}
.acro-lstat { text-align: center; min-width: 60px; }
.acro-lstat-num { display: block; font-size: 1.1rem; font-weight: 700; color: var(--acro-accent); }
.acro-lstat-label { display: block; font-size: 0.62rem; color: rgba(255,255,255,0.4); text-transform: uppercase; letter-spacing: 0.5px; }

/* Mode cards */
.acro-modes-grid {
  display: grid; grid-template-columns: repeat(2, 1fr); gap: 0.75rem; margin-bottom: 1.5rem;
}
.acro-mode-card {
  position: relative; background: rgba(255,255,255,0.04); border: 1px solid rgba(255,255,255,0.08);
  border-radius: 14px; padding: 1.3rem 1rem; cursor: pointer; text-align: center;
  transition: all 0.25s ease; overflow: hidden; color: #fff;
  -webkit-backdrop-filter: blur(8px); backdrop-filter: blur(8px);
}
.acro-mode-card::before {
  content: ''; position: absolute; inset: 0;
  background: radial-gradient(circle at 50% 0%, rgba(155,89,182,0.15), transparent 70%);
  opacity: 0; transition: opacity 0.3s;
}
.acro-mode-card:hover::before { opacity: 1; }
.acro-mode-card:hover {
  border-color: rgba(155,89,182,0.4); transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(155,89,182,0.15);
}
.acro-mode-card:active { transform: translateY(0); }
.acro-mode-card:focus-visible { outline: 2px solid var(--acro-accent); outline-offset: 2px; }
.acro-mode-card { animation: acro-card-in 0.4s ease backwards; }
.acro-mode-card:nth-child(1) { animation-delay: 0.04s; }
.acro-mode-card:nth-child(2) { animation-delay: 0.08s; }
.acro-mode-card:nth-child(3) { animation-delay: 0.12s; }
.acro-mode-card:nth-child(4) { animation-delay: 0.16s; }
@keyframes acro-card-in {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}
.acro-mc-icon { font-size: 2rem; margin-bottom: 0.4rem; position: relative; }
.acro-mc-title { font-size: 0.95rem; font-weight: 700; margin-bottom: 0.25rem; position: relative; }
.acro-mc-desc { font-size: 0.75rem; color: rgba(255,255,255,0.5); line-height: 1.4; position: relative; }
.acro-mc-time {
  margin-top: 0.5rem; font-size: 0.68rem; color: var(--acro-accent);
  font-weight: 600; position: relative;
}
.acro-mc-featured { border-color: rgba(155,89,182,0.25); }
.acro-mc-badge {
  position: absolute; top: 0.5rem; right: 0.5rem; font-size: 0.58rem; font-weight: 700;
  text-transform: uppercase; background: var(--acro-accent); color: #fff;
  padding: 0.15rem 0.5rem; border-radius: 20px; letter-spacing: 0.5px; z-index: 1;
}

/* Category filter */
.acro-lobby-filter {
  display: flex; align-items: center; justify-content: center; gap: 0.5rem; margin-bottom: 0.8rem;
}
.acro-lobby-filter-label { font-size: 0.8rem; color: rgba(255,255,255,0.5); font-weight: 500; }
.acro-cat-select {
  background: rgba(255,255,255,0.06); border: 1px solid rgba(255,255,255,0.1);
  color: rgba(255,255,255,0.7); padding: 0.45rem 0.7rem; border-radius: 8px; font-size: 0.8rem;
}
.acro-cat-select option { background: #0a0a14; color: #fff; }

/* Lobby count */
.acro-lobby-count { text-align: center; font-size: 0.75rem; color: rgba(255,255,255,0.3); }

/* ── Buttons ──────────────────────────────────────────────────────────────── */
.acro-btn {
  background: rgba(255,255,255,0.06); border: 1px solid rgba(255,255,255,0.1);
  color: rgba(255,255,255,0.8); padding: 0.6rem 1.2rem; border-radius: 8px;
  cursor: pointer; font-size: 0.85rem; font-weight: 500; transition: all 0.2s;
}
.acro-btn:hover { background: rgba(255,255,255,0.1); color: #fff; }
.acro-btn-primary {
  background: var(--acro-accent); color: #fff; border-color: var(--acro-accent); font-weight: 600;
}
.acro-btn-primary:hover { box-shadow: 0 2px 12px rgba(155,89,182,0.4); }

/* ── HUD ──────────────────────────────────────────────────────────────────── */
.acro-hud {
  display: flex; justify-content: center; gap: 1.5rem; margin-bottom: 1.5rem;
  color: rgba(255,255,255,0.6); font-size: 0.9rem;
}
.acro-hud strong { color: var(--acro-accent); }

/* ── Card ─────────────────────────────────────────────────────────────────── */
.acro-card {
  text-align: center; padding: 2rem; margin-bottom: 1.5rem;
  background: rgba(255,255,255,0.04); border: 1px solid rgba(255,255,255,0.08);
  border-radius: 16px;
  -webkit-backdrop-filter: blur(12px); backdrop-filter: blur(12px);
}
.acro-acronym {
  font-size: 3rem; font-weight: 800; color: #fff; letter-spacing: 4px;
  font-family: 'JetBrains Mono', 'Fira Code', monospace;
}
.acro-category-badge {
  margin-top: 0.5rem; display: inline-block; padding: 0.2rem 0.7rem;
  background: rgba(155,89,182,0.15); border: 1px solid rgba(155,89,182,0.3);
  border-radius: 20px; font-size: 0.75rem; color: var(--acro-accent); text-transform: uppercase;
}

/* ── Options ──────────────────────────────────────────────────────────────── */
.acro-timer-bar {
  height: 4px; width: 100%; border-radius: 2px;
  background: rgba(255,255,255,0.1); margin-bottom: 1rem; overflow: hidden;
}
.acro-timer-fill {
  height: 100%; width: 100%; border-radius: 2px;
  background: linear-gradient(90deg, var(--acro-accent), #E74C3C);
}
.acro-learn-answer {
  text-align: center; padding: 1.5rem;
  background: rgba(255,255,255,0.04); border: 1px solid rgba(255,255,255,0.08);
  border-radius: 12px;
}
.acro-options { display: grid; grid-template-columns: 1fr; gap: 0.5rem; margin-bottom: 1rem; }
.acro-option {
  padding: 0.8rem 1rem; background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.1); border-radius: 10px;
  color: rgba(255,255,255,0.8); cursor: pointer; font-size: 0.9rem;
  transition: all 0.2s; text-align: left;
}
.acro-option:hover { background: rgba(255,255,255,0.08); border-color: rgba(255,255,255,0.2); color: #fff; }
.acro-option.correct { background: rgba(46,204,113,0.2); border-color: #2ECC71; color: #2ECC71; }
.acro-option.wrong { background: rgba(231,76,60,0.2); border-color: #E74C3C; color: #E74C3C; }
.acro-option.disabled { pointer-events: none; opacity: 0.5; }

/* ── Feedback ─────────────────────────────────────────────────────────────── */
.acro-feedback {
  text-align: center; padding: 1rem;
  background: rgba(255,255,255,0.04); border: 1px solid rgba(255,255,255,0.08);
  border-radius: 12px; margin-top: 1rem;
}
.acro-feedback-icon { font-size: 2rem; margin-bottom: 0.5rem; }
.acro-feedback-answer { color: #fff; font-weight: 600; margin-bottom: 0.3rem; }
.acro-feedback-explanation { color: rgba(255,255,255,0.6); font-size: 0.85rem; margin-bottom: 0.8rem; }

/* ── Results ──────────────────────────────────────────────────────────────── */
.acro-results { text-align: center; padding: 2rem 0; }
.acro-results-score { font-size: 2.5rem; font-weight: 800; color: var(--acro-accent); margin-bottom: 0.5rem; }
.acro-results-detail { color: rgba(255,255,255,0.6); margin-bottom: 1.5rem; font-size: 0.95rem; line-height: 1.8; }
.acro-results-actions { display: flex; gap: 0.5rem; justify-content: center; }

/* ── Stats ────────────────────────────────────────────────────────────────── */
.acro-stats-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 0.8rem; }
.acro-stat-card {
  text-align: center; padding: 1.2rem; background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.08); border-radius: 12px;
}
.acro-stat-num { font-size: 1.8rem; font-weight: 700; color: var(--acro-accent); }
.acro-stat-label { color: rgba(255,255,255,0.5); font-size: 0.8rem; margin-top: 0.3rem; }

/* ── FAQ ──────────────────────────────────────────────────────────────────── */
.acro-panel details {
  margin-bottom: 1rem; padding: 1rem; background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.08); border-radius: 10px;
}
.acro-panel details summary { cursor: pointer; color: rgba(255,255,255,0.9); }
.acro-panel details p { color: rgba(255,255,255,0.7); margin-top: 0.5rem; }

@media (max-width: 480px) {
  .acro-acronym { font-size: 2.2rem; }
  .acro-modes-grid { grid-template-columns: 1fr; }
  .acro-lobby-stats { flex-wrap: wrap; gap: 0.6rem; }
  .acro-lstat { flex: 0 0 40%; }
  .acro-mode-card { padding: 1rem 0.8rem; }
  .acro-results-actions { flex-direction: column; }
}