/* ══════════════════════════════════════════════════════════════════════
   PAGE: /simulacros (Arena — selector de simulacros)
   Prefijo: .arena-*
   Hero + chart CSS-only + tarjetas de desafío + historial de intentos.
   Extraído de learning.css y responsive.css en Round 1.4.
   ══════════════════════════════════════════════════════════════════════ */

/* ══════════════════════════════════════════════════════════════
   Exam Arena System (Simulacros View)
   ══════════════════════════════════════════════════════════════ */

.arena-hero {
  background: var(--bg-white);
  border-radius: var(--r-lg);
  border: 1px solid var(--border);
  padding: 20px 24px;
  margin-bottom: 24px;
}

.arena-hero-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}

.arena-hero-title {
  font-size: 0.95rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--violet);
}

.arena-hero-best {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 14px;
  border-radius: var(--r-full);
  background: rgba(234, 179, 8, 0.1);
  color: #CA8A04;
  font-size: 0.82rem;
  font-weight: 700;
}

/* CSS-only bar chart */
.arena-chart-bars {
  display: flex;
  align-items: flex-end;
  gap: 6px;
  height: 100px;
  padding: 0 4px;
}

.arena-chart-bar-wrap {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  min-width: 0;
}

.arena-chart-bar {
  width: 100%;
  max-width: 40px;
  min-height: 4px;
  border-radius: 4px 4px 0 0;
  transition: height 0.6s ease;
}

.arena-chart-label {
  font-size: 0.62rem;
  color: var(--text-secondary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 100%;
  text-align: center;
}

.arena-chart-val {
  font-size: 0.68rem;
  font-weight: 700;
  color: var(--text-primary);
}

/* Split layout */
.arena-split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.arena-start,
.arena-history {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.arena-section-label {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  display: flex;
  align-items: center;
  gap: 6px;
  margin-bottom: 4px;
}

/* Challenge card */
.arena-challenge {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 14px 18px;
  background: var(--bg-white);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  text-decoration: none;
  color: inherit;
  transition: all 0.2s ease;
}

.arena-challenge:hover {
  border-color: var(--challenge-color, var(--violet));
  box-shadow: 0 4px 16px color-mix(in srgb, var(--challenge-color, var(--violet)) 12%, transparent);
  transform: translateY(-1px);
}

.arena-challenge-icon {
  width: 42px;
  height: 42px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  flex-shrink: 0;
}

.arena-challenge-body {
  flex: 1;
  min-width: 0;
}

.arena-challenge-title {
  font-size: 0.9rem;
  font-weight: 600;
}

.arena-challenge-meta {
  font-size: 0.75rem;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 6px;
}

.arena-challenge-btn {
  padding: 6px 16px;
  border-radius: var(--r-full);
  font-size: 0.78rem;
  font-weight: 700;
  flex-shrink: 0;
  border: none;
  cursor: pointer;
  transition: all 0.15s ease;
}

.arena-challenge-btn--primary {
  background: var(--violet);
  color: #fff;
}

.arena-challenge-btn--primary:hover {
  filter: brightness(1.1);
}

.arena-challenge-btn--outline {
  background: transparent;
  border: 2px solid var(--challenge-color, var(--violet));
  color: var(--challenge-color, var(--violet));
}

.arena-challenge-btn--resume {
  background: #D97706;
  color: #fff;
}

/* History battle cards */
.arena-history-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  background: var(--bg-white);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  transition: background 0.15s ease;
}

.arena-history-item:hover {
  background: var(--bg-primary);
}

.arena-history-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  flex-shrink: 0;
}

.arena-history-body {
  flex: 1;
  min-width: 0;
}

.arena-history-title {
  font-size: 0.84rem;
  font-weight: 600;
}

.arena-history-date {
  font-size: 0.72rem;
  color: var(--text-secondary);
}

.arena-history-score {
  font-size: 0.82rem;
  font-weight: 700;
  flex-shrink: 0;
  padding: 3px 10px;
  border-radius: var(--r-full);
}

.arena-history-empty {
  text-align: center;
  padding: 32px 0;
  color: var(--text-secondary);
  font-size: 0.88rem;
}

/* ── Cupo badge (usado por simulacros.js para indicar cuota) ─────────── */
.quest-cupo {
  margin-top: 12px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  border-radius: var(--r-full);
  font-size: 0.82rem;
  font-weight: 600;
}

.quest-cupo--available {
  background: rgba(108, 43, 255, 0.08);
  color: var(--violet);
}

.quest-cupo--exhausted {
  background: rgba(239, 68, 68, 0.08);
  color: var(--red);
}

@media (max-width: 768px) {
  .arena-split {
    grid-template-columns: 1fr;
  }
}

/* ── Mobile (≤768px) — from responsive.css 1126-1292 ─────────────────── */
@media (max-width: 768px) {
  /* ── Simulacros / Arena (Premium Redesign) ── */
  .arena-container {
    gap: var(--m-gap-xl) !important;
  }

  /* Hero / Chart Card */
  .arena-hero {
    background: linear-gradient(145deg, #FFFFFF, #F8F9FB) !important;
    border: none !important;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.04), 0 2px 8px rgba(0, 0, 0, 0.02) !important;
    border-radius: 28px !important;
    padding: 24px 20px !important;
  }

  .arena-hero-title {
    font-size: 1.1rem !important;
    font-weight: 800 !important;
    letter-spacing: -0.3px !important;
  }

  .arena-hero-best {
    background: rgba(234, 179, 8, 0.15) !important;
    padding: 6px 16px !important;
    font-size: 0.9rem !important;
  }

  .arena-split {
    flex-direction: column !important;
    gap: var(--m-gap-xl) !important;
  }

  .arena-left,
  .arena-right {
    width: 100% !important;
    max-width: 100% !important;
  }

  .arena-section-label {
    font-size: 1rem !important;
    font-weight: 800 !important;
    color: var(--text-primary) !important;
    margin-bottom: 14px !important;
    letter-spacing: -0.2px !important;
    text-transform: none !important;
  }

  /* Evolution Chart */
  .arena-chart-container {
    min-height: 180px !important;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    padding: 0 var(--m-pad) 12px var(--m-pad) !important;
    margin: 0 calc(-1 * var(--m-pad));
    scrollbar-width: none;
  }

  .arena-chart-container::-webkit-scrollbar {
    display: none;
  }

  .arena-chart-bars {
    height: 140px !important;
    gap: 16px !important;
    align-items: flex-end !important;
  }

  .arena-chart-bar-wrap {
    min-width: 36px !important;
  }

  .arena-chart-bar {
    border-radius: 8px 8px 8px 8px !important;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08) !important;
  }

  .arena-chart-val {
    font-size: 0.75rem !important;
    margin-bottom: 2px !important;
  }

  .arena-chart-label {
    font-size: 0.7rem !important;
    font-weight: 600 !important;
    margin-top: 6px !important;
  }

  .arena-title {
    font-size: 1.45rem !important;
    letter-spacing: -0.5px !important;
    font-weight: 800 !important;
  }

  .arena-desc {
    font-size: 0.95rem !important;
    line-height: 1.4 !important;
    color: var(--text-secondary) !important;
  }

  /* Challenge Cards */
  .arena-challenge {
    background: color-mix(in srgb, var(--challenge-color, var(--violet)) 3%, #fff) !important;
    border: 1px solid color-mix(in srgb, var(--challenge-color, var(--violet)) 10%, transparent) !important;
    border-radius: 24px !important;
    padding: 18px !important;
    gap: 16px !important;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.02) !important;
  }

  .arena-challenge-icon {
    width: 52px !important;
    height: 52px !important;
    border-radius: 16px !important;
    font-size: 26px !important;
    background: color-mix(in srgb, var(--challenge-color, var(--violet)) 12%, transparent) !important;
  }

  .arena-challenge-title {
    font-size: 1.05rem !important;
    font-weight: 700 !important;
    letter-spacing: -0.2px !important;
    margin-bottom: 2px !important;
  }

  .arena-challenge-meta {
    font-size: 0.85rem !important;
    font-weight: 500 !important;
  }

  .arena-challenge-btn {
    padding: 10px 20px !important;
    font-size: 0.85rem !important;
    box-shadow: 0 4px 12px color-mix(in srgb, var(--challenge-color, var(--violet)) 25%, transparent) !important;
  }

  /* History Cards */
  .arena-history-item {
    background: #FFFFFF !important;
    border: 1px solid rgba(0, 0, 0, 0.03) !important;
    border-radius: 20px !important;
    padding: 16px !important;
    gap: 14px !important;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.02) !important;
  }

  .arena-history-dot {
    width: 12px !important;
    height: 12px !important;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.1) !important;
  }

  .arena-history-title {
    font-size: 0.95rem !important;
    font-weight: 700 !important;
  }

  .arena-history-date {
    font-size: 0.8rem !important;
    margin-top: 2px !important;
  }

  .arena-history-score {
    font-size: 0.95rem !important;
    padding: 6px 14px !important;
  }
}