:root{
  --bg: #0f1612;         
  --surface: rgba(255,255,255,0.04); 
  --card-border: rgba(255,255,255,0.06);
  --accent: #145C9E;    
  --accent-2: #1F271B;  
  --muted: #D0CEBA;
  --glass: rgba(255,255,255,0.04);
  --glass-strong: rgba(255,255,255,0.06);
  --radius: 12px;
  --shadow-soft: 0 8px 24px rgba(2,6,10,0.5);
}

html, body {
  min-height: 100%;
  margin: 0;
  color: #e8ecef;
  font-family: "Nunito", system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  line-height: 1.5;
  font-size: 16px;
  padding-bottom: 40px;
  position: relative;
  z-index: 0;
}


body::before {
  content: "";
  position: fixed;
  top: 0; left: 0;
  width: 100vw;
  height: 100vh;
  background: radial-gradient(circle at 30% 30%, #1a2433 0%, #0a0c13 80%);
  z-index: -3;
}


body::after {
  content: "";
  position: fixed;
  inset: 0;
  background:
    radial-gradient(circle at 20% 30%, rgba(0, 120, 255, 0.08) 0%, transparent 50%),
    radial-gradient(circle at 80% 70%, rgba(255, 60, 160, 0.06) 0%, transparent 50%),
    radial-gradient(circle at 40% 90%, rgba(255, 255, 255, 0.05) 0%, transparent 70%);
  mix-blend-mode: screen;
  animation: galaxyGlow 35s ease-in-out infinite alternate;
  z-index: -2;
  pointer-events: none;
}


:root{
  --stars-far-duration: 50s;  
  --stars-mid-duration: 36s;  
  --stars-near-duration: 26s;  
  --twinkle-duration: 3s;     
  --float-amplitude: 2.2%;  
}

/* container */
#stars {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  overflow: hidden;
  background: transparent;
  will-change: transform, opacity;
}

#stars::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(0.8px 0.8px at 2% 6%, rgba(255,255,255,0.30), transparent),
    radial-gradient(0.9px 0.9px at 6% 22%, rgba(255,255,255,0.28), transparent),
    radial-gradient(0.8px 0.8px at 10% 44%, rgba(255,255,255,0.27), transparent),
    radial-gradient(1.0px 1.0px at 14% 12%, rgba(255,255,255,0.32), transparent),
    radial-gradient(0.9px 0.9px at 18% 52%, rgba(255,255,255,0.29), transparent),
    radial-gradient(0.8px 0.8px at 24% 30%, rgba(255,255,255,0.26), transparent),
    radial-gradient(1.0px 1.0px at 30% 74%, rgba(255,255,255,0.31), transparent),
    radial-gradient(0.9px 0.9px at 36% 10%, rgba(255,255,255,0.28), transparent),
    radial-gradient(0.8px 0.8px at 40% 48%, rgba(255,255,255,0.27), transparent),
    radial-gradient(1.0px 1.0px at 46% 66%, rgba(255,255,255,0.30), transparent),
    radial-gradient(0.9px 0.9px at 52% 20%, rgba(255,255,255,0.28), transparent),
    radial-gradient(0.8px 0.8px at 58% 56%, rgba(255,255,255,0.26), transparent),
    radial-gradient(1.1px 1.1px at 64% 34%, rgba(255,255,255,0.33), transparent),
    radial-gradient(0.9px 0.9px at 70% 80%, rgba(255,255,255,0.29), transparent),
    radial-gradient(0.8px 0.8px at 76% 14%, rgba(255,255,255,0.25), transparent),
    radial-gradient(1.0px 1.0px at 82% 40%, rgba(255,255,255,0.31), transparent),
    radial-gradient(0.9px 0.9px at 88% 68%, rgba(255,255,255,0.28), transparent),
    radial-gradient(0.8px 0.8px at 92% 24%, rgba(255,255,255,0.26), transparent),
    radial-gradient(0.9px 0.9px at 50% 90%, rgba(255,255,255,0.24), transparent),
    radial-gradient(1.0px 1.0px at 8% 86%, rgba(255,255,255,0.27), transparent);
  opacity: 0.48;
  filter: blur(0.28px);
  animation: floatFar var(--stars-far-duration) linear infinite;
  mix-blend-mode: screen;
  will-change: transform, opacity;
}


#stars div {
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(1.6px 1.6px at 4% 10%, rgba(255,255,255,0.84), transparent),
    radial-gradient(1.4px 1.4px at 10% 30%, rgba(255,255,255,0.78), transparent),
    radial-gradient(1.3px 1.3px at 16% 56%, rgba(255,255,255,0.76), transparent),
    radial-gradient(1.5px 1.5px at 22% 18%, rgba(255,255,255,0.80), transparent),
    radial-gradient(1.2px 1.2px at 28% 44%, rgba(255,255,255,0.74), transparent),
    radial-gradient(1.6px 1.6px at 34% 72%, rgba(255,255,255,0.82), transparent),
    radial-gradient(1.1px 1.1px at 40% 8%, rgba(255,255,255,0.70), transparent),
    radial-gradient(1.7px 1.7px at 46% 34%, rgba(255,255,255,0.86), transparent),
    radial-gradient(1.3px 1.3px at 52% 56%, rgba(255,255,255,0.75), transparent),
    radial-gradient(1.4px 1.4px at 58% 18%, rgba(255,255,255,0.73), transparent),
    radial-gradient(1.1px 1.1px at 64% 62%, rgba(255,255,255,0.69), transparent),
    radial-gradient(1.5px 1.5px at 70% 34%, rgba(255,255,255,0.79), transparent),
    radial-gradient(1.3px 1.3px at 76% 82%, rgba(255,255,255,0.72), transparent),
    radial-gradient(1.2px 1.2px at 82% 88%, rgba(255,255,255,0.73), transparent),
    radial-gradient(1.6px 1.6px at 88% 50%, rgba(255,255,255,0.80), transparent),
    radial-gradient(1.4px 1.4px at 24% 86%, rgba(255,255,255,0.71), transparent),
    radial-gradient(1.2px 1.2px at 12% 62%, rgba(255,255,255,0.68), transparent),
    radial-gradient(1.7px 1.7px at 36% 28%, rgba(255,255,255,0.83), transparent),
    radial-gradient(1.3px 1.3px at 44% 96%, rgba(255,255,255,0.70), transparent),
    radial-gradient(1.5px 1.5px at 60% 6%, rgba(255,255,255,0.76), transparent);
  opacity: 0.78;
  filter: blur(0.14px);
  animation: floatMid var(--stars-mid-duration) linear infinite;
  mix-blend-mode: screen;
  will-change: transform, opacity;
}


#stars::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(2.6px 2.6px at 3% 26%, rgba(255,255,255,0.99), transparent),
    radial-gradient(2.2px 2.2px at 12% 62%, rgba(255,255,255,0.94), transparent),
    radial-gradient(2.0px 2.0px at 20% 14%, rgba(255,255,255,0.92), transparent),
    radial-gradient(2.4px 2.4px at 28% 54%, rgba(255,255,255,0.96), transparent),
    radial-gradient(1.8px 1.8px at 36% 32%, rgba(255,255,255,0.90), transparent),
    radial-gradient(1.6px 1.6px at 44% 70%, rgba(255,255,255,0.88), transparent),
    radial-gradient(2.1px 2.1px at 52% 20%, rgba(255,255,255,0.95), transparent),
    radial-gradient(1.7px 1.7px at 60% 78%, rgba(255,255,255,0.89), transparent),
    radial-gradient(1.9px 1.9px at 68% 88%, rgba(255,255,255,0.90), transparent),
    radial-gradient(1.5px 1.5px at 76% 44%, rgba(255,255,255,0.87), transparent),
    radial-gradient(1.8px 1.8px at 84% 82%, rgba(255,255,255,0.90), transparent),
    radial-gradient(1.6px 1.6px at 92% 60%, rgba(255,255,255,0.88), transparent),
    radial-gradient(2.2px 2.2px at 48% 92%, rgba(255,255,255,0.91), transparent),
    radial-gradient(2.0px 2.0px at 16% 78%, rgba(255,255,255,0.89), transparent),
    radial-gradient(1.7px 1.7px at 32% 8%, rgba(255,255,255,0.88), transparent),
    radial-gradient(1.9px 1.9px at 56% 36%, rgba(255,255,255,0.90), transparent),
    radial-gradient(1.6px 1.6px at 64% 56%, rgba(255,255,255,0.87), transparent),
    radial-gradient(2.0px 2.0px at 72% 26%, rgba(255,255,255,0.91), transparent),
    radial-gradient(1.8px 1.8px at 80% 68%, rgba(255,255,255,0.89), transparent),
    radial-gradient(1.5px 1.5px at 88% 12%, rgba(255,255,255,0.86), transparent);
  opacity: 0.96;
  filter: drop-shadow(0 0 3px rgba(255,255,255,0.03));
  animation: floatNear var(--stars-near-duration) linear infinite, twinkle var(--twinkle-duration) ease-in-out infinite;
  mix-blend-mode: screen;
  will-change: transform, opacity;
}

@keyframes floatFar {
  0%   { transform: translate3d(calc(-1 * var(--float-amplitude)), calc(-0.6 * var(--float-amplitude)), 0) scale(1); }
  50%  { transform: translate3d(calc(1.2 * var(--float-amplitude)), calc(1.4 * var(--float-amplitude)), 0) scale(1.02); }
  100% { transform: translate3d(calc(-1 * var(--float-amplitude)), calc(-0.6 * var(--float-amplitude)), 0) scale(1); }
}
@keyframes floatMid {
  0%   { transform: translate3d(0%, 0%, 0) scale(1); }
  50%  { transform: translate3d(calc(1.8 * var(--float-amplitude)), calc(-1.0 * var(--float-amplitude)), 0) scale(1.01); }
  100% { transform: translate3d(0%, 0%, 0) scale(1); }
}
@keyframes floatNear {
  0%   { transform: translate3d(calc(0.4 * var(--float-amplitude)), calc(-0.2 * var(--float-amplitude)), 0) scale(1); opacity: 0.9; }
  50%  { transform: translate3d(calc(-1.3 * var(--float-amplitude)), calc(1.6 * var(--float-amplitude)), 0) scale(1.01); opacity: 1; }
  100% { transform: translate3d(calc(0.4 * var(--float-amplitude)), calc(-0.2 * var(--float-amplitude)), 0) scale(1); opacity: 0.9; }
}

@keyframes twinkle {
  0%   { opacity: 0.9; filter: drop-shadow(0 0 3px rgba(255,255,255,0.02)); }
  50%  { opacity: 1; filter: drop-shadow(0 0 6px rgba(255,255,255,0.04)); }
  100% { opacity: 0.9; filter: drop-shadow(0 0 3px rgba(255,255,255,0.02)); }
}

#stars, #stars::before, #stars::after, #stars div, body::before, body::after {
  backface-visibility: hidden;
  transform-style: preserve-3d;
  will-change: transform, opacity;
}

@media (prefers-reduced-motion: reduce) {
  #stars::before, #stars div, #stars::after { animation: none !important; transition: none !important; }
}


main.container { max-width:1100px; padding:2rem 1rem; }

/* ---------- Navbar ---------- */
.navbar {
  background: linear-gradient(90deg, rgba(255,255,255,0.03), rgba(255,255,255,0.02));
  border-radius: 12px;
  box-shadow: var(--shadow-soft);
  padding: 0.3rem 0rem;

  margin-bottom: 1.25rem;
  align-items:center;
}

/* brand */
.navbar-brand {
  font-family: "Poppins", "Josefin Sans", sans-serif;
  font: weight 800%;
  color: #0c5586;
  font-size:1.3rem;
  letter-spacing:0.1px;
}

/* nav buttons */
.navbar .nav-link {
  color: var(--muted);
  transition: all 180ms ease;
  border-radius:8px;
  padding:0.4rem 0.6rem;
  margin-right: 0.3rem;
}
.navbar .nav-link:hover, .navbar .nav-link:focus {
  color: white !important;
  background: linear-gradient(90deg, rgba(20,92,158,0.12), rgba(31,39,27,0.06));
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(5,10,20,0.35);
}


.navbar .btn {
  background: transparent;
  color: var(--muted);
  border: 1px solid rgba(255,255,255,0.06);
  padding:0.35rem 0.6rem;
  border-radius:8px;
  transition: all 180ms ease;
}
.navbar .btn:hover {
  background: linear-gradient(90deg, var(--accent) 0%, #2F7FC0 100%);
  color: #fff;
  border-color: rgba(255,255,255,0.08);
  box-shadow: 0 8px 18px rgba(20,92,158,0.18);
  transform: translateY(-2px);
}



/* ---------- Library ---------- */

#library-grid { margin-top:0.4rem; }


.card.cap-card {
  background: linear-gradient(180deg, rgba(255,255,255,0.02), rgba(255,255,255,0.01));
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding:0.9rem;
  box-shadow: 0 6px 18px rgba(2,9,12,0.5);
  min-height:140px;
  display:flex;
  flex-direction:column;
}


.card-title {
  color: #FFFFFF;
  font-weight:600;
  margin-bottom:0.25rem;
  font-size:1.4rem;
}
.cap-subject {
  color: #9c9c97;
  margin-bottom:0.6rem;
  font-size:1rem;
}
.text-updated{
 color: #72708a; 
 
}
.cap-level{
  color: #D0CEBA;
  border-radius: 5px;
background: linear-gradient(135deg, #0b1b2b 0%, #1a2930 40%, #1e3a5f 70%, #2b256b 100%);
}

.quiz-t{
  color: #D0CEBA;
}
.known-color{
  color: #D0CEBA;
}

.card .progress {
  height:8px;
  background: rgba(255,255,255,0.03);
  border-radius: 6px;
  overflow:hidden;
}
.card .progress-bar {
  transition: width 400ms ease;
  background: linear-gradient(90deg, var(--accent-2), var(--accent));
  box-shadow: inset 0 -4px 8px rgba(0,0,0,0.25);
}


.card small.text-muted { color: #aab0b2; }


.card .btn {
  font-size:0.85rem;
  padding:0.33rem 0.55rem;
  border-radius:8px;
}

.card .btn-learn { color: #ffffff; border-color: rgba(163,240,255,0.06); }
.card .btn-edit { border-color: rgba(255,255,255,0.05); color:var(--muted); }
.card .btn-export { color: #a3f0ff; border-color: rgba(163,240,255,0.06); }
.card .btn-delete { color: #ff9a9a; border-color: rgba(255,120,120,0.06); }


.card .btn-learn:hover{
background-color:  #ffffff;
color: #0a0c13;
}

.card .btn-edit:hover{
  background-color:  var(--muted);
color: #0a0c13;
}

.card .btn-export:hover{
  background-color: #a3f0ff;
  color: #0a0c13;
}



#library-empty {
  color: #b9c0be;
  text-align:center;
  padding:2rem 1rem;
  border-radius:10px;
  margin-top:1rem;
}

/* ---------- Author ---------- */

.author-section .form-row,
.author-panel {
  border: 1px solid rgba(255,255,255,0.06); 
  border-radius: 12px;
  padding: 0.6rem;
  background: linear-gradient(180deg, rgba(255,255,255,0.008), rgba(255,255,255,0.004));
  transition: box-shadow 180ms ease, transform 120ms ease, border-color 120ms ease;
}


.author-section .form-row:focus-within,
.author-panel:focus-within,
.author-section .form-row:hover,
.author-panel:hover {
  border-color: rgba(20,92,158,0.28);
  box-shadow: 0 20px 40px rgba(20,92,158,0.09);
  transform: translateY(-3px);
}


.author-section .form-control.form-color,
.author-section .form-select.form-color,
.author-section textarea.form-color {
  border: 1px solid rgba(255,255,255,0.04);
  border-radius: 10px;
  padding: 0.55rem 0.8rem;
  background: transparent;
  color: var(--muted);
  transition: border-color 120ms ease, box-shadow 120ms ease;
}


.author-section .form-control.form-color:focus,
.author-section .form-select.form-color:focus,
.author-section textarea.form-color:focus {
  border-color: rgba(20,92,158,0.24);
  box-shadow: 0 12px 28px rgba(20,92,158,0.08);
  outline: none;
}


.author-two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  align-items: start;
}


.author-side-by-side {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  align-items: start;
}


@media (max-width: 900px) {
  .author-two-col,
  .author-side-by-side {
    grid-template-columns: 1fr;
  }
}


.author-actions {
  display: flex;
  gap: 0.6rem;
  justify-content: flex-end;
  margin-top: 0.6rem;
}


@media (max-width: 900px) {
  .author-actions { justify-content: flex-start; }
}

/* Save/Cancel */
.btn-author {
  border-radius: 10px;
  padding: 0.45rem 0.8rem;
  background: linear-gradient(90deg, var(--accent) 0%, #2F7FC0 100%);
  color: #fff;
  border: 0;
  box-shadow: 0 8px 18px rgba(20,92,158,0.12);
}

.btn-author:hover{
  background: linear-gradient(90deg, var(--accent) 0%, #1d517c 100%);
  color: #fff;
  border-color: rgba(255,255,255,0.08);
  box-shadow: 0 10px 20px rgba(20,92,158,0.18);

}

.author-section ::placeholder {
  color: rgba(108, 119, 136, 0.55); 
  letter-spacing: 0.3px;
}

.btn-outline-cancel {
  background: transparent;
  border: 1px solid rgba(255,255,255,0.05);
  color: var(--muted);
  border-radius: 10px;
  padding: 0.45rem 0.8rem;
}


.author-section .form-label { margin-bottom: 0.35rem; color: var(--muted); }


#flashcardsEditor .row,
#quizEditor .card {
  border-radius: 10px;
  padding: 0.45rem;
  margin-bottom: 0.5rem;
  border: 1px solid rgba(255,255,255,0.03);
  background: linear-gradient(180deg, rgba(255,255,255,0.01), rgba(255,255,255,0.006));
}


#flashcardsEditor .btnDel,
#quizEditor .btnDelQ {
  padding: 0.25rem 0.5rem;
  font-size: 0.9rem;
}


.author-preview { border-radius: 10px; padding: 0.7rem; border: 1px solid rgba(255,255,255,0.03); }

/* ---------- Learn ---------- */

#learn-section .title-text { color: #D0CEBA; }
#learn-section .form-color { background: transparent; border: 1px solid rgba(255,255,255,0.03); }

/* learn-meta */
#learn-meta {
  font-weight: 700;
  color: var(--accent);
  font-size: 1.05rem;
  display:flex;
  flex-direction:column;
  gap:0.15rem;
}
#learn-meta .small { color: var(--muted); font-weight:500; }


#learn-select.form-color {
  border-radius: 10px;
  padding: 0.45rem 0.6rem;
  color: var(--muted);
  min-width: 220px;
  border: 1px solid rgba(255,255,255,0.04);
  background: linear-gradient(180deg, rgba(255,255,255,0.01), rgba(255,255,255,0.006));
  box-shadow: inset 0 -3px 6px rgba(0,0,0,0.25);
}

/* tabs (Notes / Flashcards / Quiz) */
.learn-nav {
  gap: 0.5rem;
  border-radius: 12px;
  padding: 0.25rem;
}
.learn-nav .btn {
  border-radius: 10px;
  background: transparent;
  color: var(--muted);
  border: 1px solid rgba(255,255,255,0.03);
  padding: 0.4rem 0.9rem;
  transition: all 160ms ease;
  box-shadow: none;
}
.learn-nav .btn:hover, .learn-nav .btn:focus {
  transform: translateY(-3px);
  color: #fff;
  background: linear-gradient(90deg, rgba(20,92,158,0.14), rgba(31,39,27,0.06));
  box-shadow: 0 10px 24px rgba(20,92,158,0.08);
}
.learn-nav .btn.active {
  background: linear-gradient(90deg, var(--accent) 0%, #2F7FC0 100%);
  color: #fff;
  border: none;
  box-shadow: 0 12px 30px rgba(20,92,158,0.16);
}

/* Notes view */
#notes-view { margin-top: 0.6rem; }
#notes-search.form-color {
  width: 100%;
  border-radius: 10px;
  padding: 0.6rem 0.75rem;
  border: 1px solid rgba(255,255,255,0.03);
  box-shadow: none;
  color: var(--muted);
}

#notes-search::placeholder {
  color: rgba(108, 119, 136, 0.55); 
  letter-spacing: 0.3px;
}


#notes-list.list-group {
  margin-top: 0.5rem;
  border-radius: 12px;
  overflow: hidden;
  background: linear-gradient(180deg, rgba(255,255,255,0.01), rgba(255,255,255,0.006));
  border: 1px solid rgba(255,255,255,0.02);
}
#notes-list .list-group-item {
  background: transparent;
  border: none;
  padding: 0.85rem 1rem;
  color: var(--muted);
  border-bottom: 1px dashed rgba(255,255,255,0.02);
}
#notes-list .list-group-item:last-child { border-bottom: none; }

/* Flashcards */
#flash-view { margin-top: 0.6rem; }
#flip-wrapper { margin: 0.6rem 0 1rem 0; display:flex; justify-content:center; align-items:center; }
#flip-card {
  width: min(500px, 92%);
  max-width: 820px;
  height: 170px;
  position: relative;
  transform-style: preserve-3d;
  transition: transform 0.6s;
  cursor: pointer;
  user-select: none;
  border-radius: 14px;
  border: 1px solid var(--card-border);
  background: linear-gradient(180deg, rgba(255,255,255,0.02), rgba(255,255,255,0.01));
  display:flex;
  align-items:center;
  justify-content:center;
  padding:1.2rem;
  box-shadow: 0 10px 30px rgba(15, 25, 41, 0.5);
}

/* flashcard faces */
.card-face {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  backface-visibility: hidden;
  padding: 1.4rem;
  border-radius: 12px;
  font-size: 1.3rem;
  text-align:center;
  color: #fff;
}
.card-face.front {
  background: linear-gradient(135deg, rgba(20,92,158,0.95), rgba(31,39,27,0.9));
}
.card-face.back {
  transform: rotateY(180deg);
  background: linear-gradient(135deg, rgba(31,39,27,0.95), rgba(20,92,158,0.9));
}


#flip-card.flipped { transform: rotateY(180deg); }

/* controls row */
#flash-view .d-flex.justify-content-between.mb-2 { margin-top: 0.4rem; align-items:center; }
#fc-counter { color: var(--muted); font-weight:600; }
#mark-known, #mark-unknown, #prev-card, #next-card {
  min-width: 96px;
  border-radius: 10px;
  padding: 0.4rem 0.7rem;
  box-shadow: 0 6px 16px rgba(2,6,12,0.35);
}

/* known count */
#known-count { color: #D0CEBA; font-size:0.9rem; }


@media (max-width: 576px) {
  #flip-card { height: 200px; padding:1rem; }
  .card-face { font-size: 1.05rem; padding: 0.9rem; }
  #learn-select { min-width: 140px; }
  #choices .btn { font-size: 0.95rem; padding: 0.5rem; }
}


#flip-card:focus { outline: 3px solid rgba(20,92,158,0.12); outline-offset: 6px; }
.learn-nav .btn:focus, #choices .btn:focus { outline: 3px solid rgba(20,92,158,0.12); outline-offset: 3px; }

.title-text { color: #D0CEBA; font-weight:600; }

html, body { background-color: var(--bg); }


/*Quiz*/

.quiz-option,
#choices .btn {
  color: #fff !important; 
  background: rgba(255,255,255,0.03);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: 10px;
  padding: 0.5rem 0.75rem;
  text-align: center;
  cursor: pointer;
  transition: all 180ms ease;
}

/* hover */
.quiz-option:hover,
#choices .btn:hover {
  transform: translateY(-3px);
  background: rgba(255,255,255,0.06);
}

.quiz-option.correct,
#choices .btn.correct {
  background: linear-gradient(90deg, rgba(60,200,120,0.14), rgba(20,160,70,0.12));
  border-color: rgba(60,200,120,0.28);
  color: #eaffef !important;
  box-shadow: 0 6px 20px rgba(20,160,80,0.12);
}

.quiz-option.wrong,
#choices .btn.wrong {
  background: linear-gradient(90deg, rgba(255,90,90,0.14), rgba(200,40,40,0.12));
  border-color: rgba(255,90,90,0.28);
  color: #ffecec !important;
  box-shadow: 0 6px 20px rgba(200,40,40,0.12);
}


#choices .quiz-option,
.quiz-option {
  color: #fff !important;
  background: rgba(255,255,255,0.03) !important;
  border: 1px solid rgba(255,255,255,0.06) !important;
  border-radius: 10px !important;
  padding: 0.55rem 0.75rem !important;
  text-align: center;
  cursor: pointer;
  transition: all 160ms ease !important;
}


#choices .quiz-option:hover,
.quiz-option:hover {
  transform: translateY(-3px);
  background: rgba(255,255,255,0.07) !important;
}


#choices .quiz-option.correct,
.quiz-option.correct {
  background: linear-gradient(90deg, rgba(60,200,120,0.18), rgba(20,160,70,0.12)) !important;
  border-color: rgba(60,200,120,0.34) !important;
  color: #eaffef !important;
  box-shadow: 0 8px 26px rgba(20,160,80,0.12) !important;
}

#choices .quiz-option.wrong,
.quiz-option.wrong {
  background: linear-gradient(90deg, rgba(255,90,90,0.18), rgba(200,40,40,0.12)) !important;
  border-color: rgba(255,90,90,0.34) !important;
  color: #ffecec !important;
  box-shadow: 0 8px 26px rgba(200,40,40,0.12) !important;
}


#flip-wrapper { overflow: hidden; }
#flip-card { box-sizing: border-box; max-width:100%; }


.glass-box {
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.06), rgba(255, 255, 255, 0.02));
  backdrop-filter: blur(8px);
  padding: 12px 14px;
  border-radius: 12px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  color: #f8f8f8;
  transition: background 0.3s ease, border-color 0.3s ease;
}
.glass-box:hover {
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.08), rgba(255, 255, 255, 0.03));
  border-color: rgba(255, 255, 255, 0.15);
}