/* ══════════════════════════════════════════════
   AE-PLX-LANGSON – Module HỌC TIẾNG ANH
   static/css/flashcard.css  (Phase 2)
   Dùng KÈM english.css (layout header/sidebar/theme)
   ══════════════════════════════════════════════ */

/* ══ TOPBAR ═══════════════════════════════════ */
.fc-topbar{
  display:flex;align-items:center;gap:16px;flex-wrap:wrap;
}
.fc-back{
  font-size:12px;color:var(--muted);text-decoration:none;
  padding:7px 12px;border-radius:9px;
  border:1px solid var(--border);transition:.18s;
}
.fc-back:hover{color:#fff;border-color:rgba(42,127,255,.35);}
.fc-title{font-size:17px;font-weight:800;color:#fff;}
.fc-filters{display:flex;gap:6px;margin-left:auto;flex-wrap:wrap;}
.fc-filter{
  padding:7px 14px;border-radius:20px;cursor:pointer;
  background:rgba(255,255,255,.04);
  border:1px solid var(--border);
  font-size:11px;font-weight:600;color:var(--muted);
  transition:.18s;
}
.fc-filter:hover{color:#aac8e0;border-color:rgba(42,127,255,.3);}
.fc-filter.active{
  background:rgba(42,127,255,.15);color:#fff;
  border-color:rgba(42,127,255,.4);
}

/* ══ CHỦ ĐỀ (chips) ═══════════════════════════ */
.fc-cats{display:flex;gap:8px;flex-wrap:wrap;}
.fc-cat{
  display:flex;align-items:center;gap:7px;
  padding:8px 14px;border-radius:12px;cursor:pointer;
  background:var(--surface);
  border:1px solid var(--border);
  font-size:12px;font-weight:600;color:var(--muted);
  transition:.18s;
}
.fc-cat:hover{transform:translateY(-1px);color:#aac8e0;border-color:rgba(42,127,255,.3);}
.fc-cat.active{
  background:rgba(42,127,255,.15);color:#fff;
  border-color:rgba(42,127,255,.45);
  box-shadow:0 4px 14px rgba(42,127,255,.15);
}
.fc-cat .cat-count{
  font-size:10px;color:#3a6a8a;
  background:rgba(0,0,0,.25);border-radius:8px;padding:1px 7px;
}
.fc-cat.active .cat-count{color:#8ec0ff;}

/* ══ THỐNG KÊ ═════════════════════════════════ */
.fc-stats{
  display:grid;grid-template-columns:repeat(5,1fr);gap:10px;
}
.fc-stat{
  background:var(--surface);
  border:1px solid var(--border);
  border-radius:12px;padding:12px 14px;text-align:center;
  transition:.2s;
}
.fc-stat:hover{border-color:rgba(42,127,255,.25);}
.fcs-val{font-size:21px;font-weight:800;color:#fff;line-height:1.1;}
.fcs-label{font-size:10px;color:var(--dim);text-transform:uppercase;letter-spacing:1px;margin-top:3px;}
.fcs-bar{
  height:5px;border-radius:4px;overflow:hidden;margin-top:7px;
  background:rgba(42,127,255,.1);
}
.fcs-fill{
  height:100%;width:0;border-radius:4px;
  background:linear-gradient(90deg,#00c864,#00e87a);
  transition:width .6s cubic-bezier(.22,1,.36,1);
}

/* ══ STAGE ════════════════════════════════════ */
.fc-stage{
  background:var(--surface);
  border:1px solid var(--border);
  border-radius:16px;
  padding:22px 18px 26px;
  display:flex;flex-direction:column;align-items:center;gap:16px;
}
.fc-counter{
  font-size:12px;font-weight:700;color:var(--muted);
  display:flex;align-items:center;gap:12px;
}
.fc-combo{
  display:none;
  background:linear-gradient(90deg,#ff9800,#ffb340);
  color:#1a1200;font-weight:800;font-size:11px;
  padding:3px 12px;border-radius:12px;
  animation:comboPulse .5s ease;
}
.fc-combo.show{display:inline-block;}
@keyframes comboPulse{0%{transform:scale(.6);}60%{transform:scale(1.15);}100%{transform:scale(1);}}

/* ── Thẻ lật 3D ── */
.fc-scene{
  width:min(520px,100%);height:320px;
  perspective:1400px;position:relative;
}
.fc-card{
  width:100%;height:100%;position:relative;
  transform-style:preserve-3d;
  transition:transform .55s cubic-bezier(.4,.1,.2,1);
  cursor:pointer;
}
.fc-card.flipped{transform:rotateY(180deg);}
.fc-card.slide-out{animation:slideOut .22s ease both;}
.fc-card.slide-in{animation:slideIn .28s ease both;}
@keyframes slideOut{to{opacity:0;transform:translateX(-36px);}}
@keyframes slideIn{from{opacity:0;transform:translateX(36px);}to{opacity:1;transform:translateX(0);}}

.fc-face{
  position:absolute;inset:0;border-radius:20px;
  backface-visibility:hidden;-webkit-backface-visibility:hidden;
  display:flex;flex-direction:column;align-items:center;justify-content:center;
  gap:10px;padding:26px;
  border:1px solid rgba(42,127,255,.22);
  box-shadow:0 18px 50px rgba(0,0,0,.4);
}
.fc-front{
  background:linear-gradient(160deg,#0f2236 0%,#0e1d2e 60%,#0d2a44 100%);
}
.fc-backside{
  background:linear-gradient(160deg,#0d2a44 0%,#0e1d2e 55%,#0f2236 100%);
  transform:rotateY(180deg);
}

.fc-pos{
  font-size:10px;font-weight:700;color:#4a9fff;
  background:rgba(42,127,255,.12);
  border:1px solid rgba(42,127,255,.25);
  border-radius:10px;padding:3px 12px;
  text-transform:uppercase;letter-spacing:2px;
}
.fc-word{
  font-size:44px;font-weight:800;color:#fff;
  text-align:center;line-height:1.15;
  text-shadow:0 4px 24px rgba(42,127,255,.35);
  word-break:break-word;
}
.fc-speak-big{
  width:44px;height:44px;border-radius:50%;cursor:pointer;
  background:rgba(42,127,255,.12);
  border:1px solid rgba(42,127,255,.3);
  font-size:19px;transition:.2s;
}
.fc-speak-big:hover{background:rgba(42,127,255,.25);transform:scale(1.1);}
.fc-hint{font-size:10px;color:#2a4a5a;letter-spacing:1px;text-transform:uppercase;}
.fc-badge{position:absolute;top:14px;left:16px;font-size:10px;font-weight:700;
  border-radius:9px;padding:3px 10px;}
.fc-badge.learned{color:#00e87a;background:rgba(0,200,100,.1);border:1px solid rgba(0,200,100,.25);}
.fc-badge.review{color:#ffb340;background:rgba(255,152,0,.1);border:1px solid rgba(255,152,0,.25);}

.fc-fav{
  position:absolute;top:12px;right:14px;
  background:none;border:none;cursor:pointer;
  font-size:22px;color:#3a5a7a;transition:.2s;line-height:1;
}
.fc-fav:hover{transform:scale(1.2);}
.fc-fav.on{color:#ffd23a;text-shadow:0 0 14px rgba(255,210,58,.6);}

.fc-meaning{font-size:30px;font-weight:800;color:#fff;text-align:center;line-height:1.2;}
.fc-ipa{font-size:15px;color:#4a9fff;font-weight:600;letter-spacing:.5px;}
.fc-example{
  width:100%;max-width:400px;text-align:center;
  background:rgba(0,0,0,.2);
  border:1px solid rgba(255,255,255,.06);
  border-radius:12px;padding:12px 16px;
}
.fc-ex-en{font-size:14px;color:#c0d8ee;font-style:italic;line-height:1.5;}
.fc-ex-vi{font-size:12px;color:#5a8aaa;margin-top:5px;line-height:1.5;}
.fc-speak-small{
  padding:7px 16px;border-radius:16px;cursor:pointer;
  background:rgba(42,127,255,.1);
  border:1px solid rgba(42,127,255,.25);
  font-size:11px;font-weight:600;color:#8ec0ff;transition:.2s;
}
.fc-speak-small:hover{background:rgba(42,127,255,.2);}

/* ── XP bay lên ── */
.fc-xp-float{
  position:absolute;top:38%;left:50%;
  transform:translate(-50%,0);
  font-size:26px;font-weight:900;color:#00e87a;
  text-shadow:0 0 20px rgba(0,232,122,.7);
  opacity:0;pointer-events:none;z-index:50;
}
.fc-xp-float.fly{animation:xpFly 1s ease-out forwards;}
@keyframes xpFly{
  0%{opacity:0;transform:translate(-50%,10px) scale(.7);}
  25%{opacity:1;transform:translate(-50%,-14px) scale(1.15);}
  100%{opacity:0;transform:translate(-50%,-80px) scale(1);}
}

/* ── Nhớ / Quên ── */
.fc-judge{
  display:flex;gap:12px;
  opacity:.35;pointer-events:none;
  transition:opacity .25s;
}
.fc-judge.ready{opacity:1;pointer-events:auto;}
.fc-btn-nho,.fc-btn-quen{
  padding:12px 26px;border-radius:12px;cursor:pointer;
  font-size:14px;font-weight:700;transition:.18s;
  display:flex;align-items:center;gap:8px;
}
.fc-btn-nho{
  background:linear-gradient(90deg,#00a854,#00c864);
  border:none;color:#fff;
  box-shadow:0 6px 20px rgba(0,200,100,.25);
}
.fc-btn-nho:hover{transform:translateY(-2px);box-shadow:0 10px 26px rgba(0,200,100,.35);}
.fc-nho-xp{font-size:10px;background:rgba(0,0,0,.2);border-radius:8px;padding:2px 8px;}
.fc-btn-quen{
  background:rgba(255,77,77,.08);
  border:1px solid rgba(255,77,77,.3);color:#ff8a8a;
}
.fc-btn-quen:hover{background:rgba(255,77,77,.16);transform:translateY(-2px);}

/* ── Điều khiển ── */
.fc-controls{display:flex;gap:8px;flex-wrap:wrap;justify-content:center;}
.fc-ctrl{
  display:flex;flex-direction:column;align-items:center;gap:3px;
  min-width:74px;padding:10px 14px;border-radius:12px;cursor:pointer;
  background:var(--surface2);
  border:1px solid var(--border);
  font-size:17px;color:#fff;transition:.18s;
}
.fc-ctrl span{font-size:9px;font-weight:700;color:var(--muted);
  text-transform:uppercase;letter-spacing:1px;}
.fc-ctrl:hover{border-color:rgba(42,127,255,.4);transform:translateY(-2px);}
.fc-ctrl:active{transform:translateY(0) scale(.96);}
.fc-ctrl:focus-visible{outline:2px solid var(--blue);outline-offset:2px;}

.fc-kb-hint{font-size:10px;color:#2a4a5a;}
.fc-kb-hint b{color:#3a6a8a;}

.fc-empty{
  display:flex;flex-direction:column;align-items:center;gap:10px;padding:30px 0;
}
.fc-empty p{font-size:12px;color:#2a4a5a;text-align:center;line-height:1.6;}

/* ══ RESPONSIVE ═══════════════════════════════ */
@media(max-width:1100px){
  .fc-stats{grid-template-columns:repeat(3,1fr);}
}
@media(max-width:800px){
  .fc-stats{grid-template-columns:repeat(2,1fr);}
  .fc-scene{height:300px;}
  .fc-word{font-size:34px;}
  .fc-meaning{font-size:24px;}
  .fc-topbar{gap:10px;}
  .fc-filters{margin-left:0;width:100%;}
}
@media(max-width:420px){
  .fc-scene{height:290px;}
  .fc-word{font-size:28px;}
  .fc-judge{width:100%;flex-direction:column-reverse;}
  .fc-btn-nho,.fc-btn-quen{justify-content:center;}
  .fc-ctrl{min-width:60px;padding:9px 10px;}
}