/* =====================================================
   Flashcard Engage — fce-style.css (front-end widget)
   ===================================================== */

.fce-app {
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  max-width: 640px;
  margin: 2rem auto;
  padding: 0;
  color: #1a2340;
  border: 1px solid #e3e8f0;
  border-radius: 16px;
  overflow: hidden;
  box-shadow: 0 6px 24px rgba(20,30,60,.08);
  background: #fff;
}

/* Header */
.fce-header {
  background: linear-gradient(135deg, #2a3a8c 0%, #4a5fc1 100%);
  padding: .9rem 1.25rem;
  display: flex;
  align-items: center;
  gap: .65rem;
  color: #fff;
}
.fce-logo { font-size: 1.5rem; }
.fce-subtitle { margin: 0; font-size: .82rem; opacity: .9; font-weight: 500; }

/* Controls */
.fce-controls {
  display: flex;
  gap: .6rem;
  align-items: center;
  justify-content: space-between;
  padding: .65rem 1.1rem;
  background: #f6f8fc;
  border-bottom: 1px solid #e3e8f0;
  flex-wrap: wrap;
}
.fce-select {
  padding: .35rem .7rem;
  border: 1.5px solid #c8d2ea;
  border-radius: 7px;
  background: #fff;
  font-size: .82rem;
  color: #1a2340;
  cursor: pointer;
}

/* Buttons */
.fce-btn {
  border: none;
  border-radius: 7px;
  font-size: .8rem;
  font-weight: 600;
  cursor: pointer;
  padding: .4rem .9rem;
  transition: transform .15s, opacity .15s;
}
.fce-btn:hover { transform: translateY(-1px); }
.fce-btn-secondary { background: #fff; border: 1.5px solid #c8d2ea; color: #2a3a8c; }
.fce-btn-secondary:hover { background: #eef1fb; }
.fce-btn-nav { background: #fff; border: 1.5px solid #c8d2ea; color: #2a3a8c; flex: 1; }
.fce-btn-nav:hover { background: #eef1fb; }

/* Progress */
.fce-progress-wrap { padding: .6rem 1.1rem .3rem; }
.fce-card-counter { font-size: .75rem; color: #6b7494; font-weight: 500; display: block; margin-bottom: .35rem; }
.fce-progress-bar-bg { background: #e7ebf6; border-radius: 999px; height: 5px; overflow: hidden; }
.fce-progress-bar { height: 100%; background: linear-gradient(90deg, #2a3a8c, #5a72e0); border-radius: 999px; transition: width .4s ease; }

/* Stage */
.fce-stage { perspective: 1100px; padding: 1.1rem; }
.fce-card { width: 100%; cursor: pointer; outline: none; }
.fce-card:focus-visible .fce-card-inner { box-shadow: 0 0 0 3px #5a72e0, 0 6px 22px rgba(0,0,0,.10); }

.fce-card-inner {
  position: relative;
  width: 100%;
  min-height: 190px;
  transform-style: preserve-3d;
  transition: transform .5s cubic-bezier(.4,.2,.2,1);
  border-radius: 14px;
  box-shadow: 0 6px 22px rgba(0,0,0,.08);
}
.fce-card.is-flipped .fce-card-inner { transform: rotateY(180deg); }

.fce-card-front, .fce-card-back {
  position: absolute;
  inset: 0;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  border-radius: 14px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 1.5rem 1.75rem;
  text-align: center;
}
.fce-card-front { background: linear-gradient(160deg, #fff 60%, #eef1fb 100%); border: 2px solid #dbe2f5; }
.fce-card-back {
  background: linear-gradient(160deg, #1a2340 50%, #232f5e 100%);
  border: 2px solid #2a3a8c;
  transform: rotateY(180deg);
  color: #fff;
}

.fce-card-label {
  font-size: .65rem;
  font-weight: 700;
  letter-spacing: 1.3px;
  text-transform: uppercase;
  background: #e7ebf6;
  color: #2a3a8c;
  padding: .2rem .7rem;
  border-radius: 999px;
  margin-bottom: .9rem;
}
.fce-label-answer { background: rgba(255,255,255,.15); color: #aebbf2; }

.fce-card-text { margin: 0; font-size: 1rem; line-height: 1.55; font-weight: 500; max-width: 480px; }
.fce-answer-text { font-size: 1.05rem; font-weight: 700; color: #8fd9ff; }

.fce-hint { margin-top: 1rem; font-size: .72rem; color: #8a93b8; animation: fce-pulse 2s infinite; }
@keyframes fce-pulse { 0%,100% { opacity: 1; } 50% { opacity: .45; } }

.fce-category-badge {
  margin-top: .9rem;
  font-size: .65rem;
  font-weight: 600;
  letter-spacing: .8px;
  text-transform: uppercase;
  background: rgba(255,255,255,.12);
  color: #cdd6ff;
  padding: .2rem .7rem;
  border-radius: 999px;
  border: 1px solid rgba(255,255,255,.18);
}

/* Nav */
.fce-nav { display: flex; gap: .6rem; padding: 0 1.1rem 1.1rem; }

@media (max-width: 480px) {
  .fce-card-front, .fce-card-back { padding: 1.1rem 1rem; }
  .fce-card-text { font-size: .92rem; }
}