@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@400;600;800&display=swap');

*{margin:0;padding:0;box-sizing:border-box}

:root{
  --brand-a:#b06ab3;
  --brand-b:#4568dc;

  --glass-bg: rgba(255,255,255,0.15);
  --glass-bg-2: rgba(255,255,255,0.18);
  --glass-shadow: rgba(0,0,0,0.25);
  --glass-blur: 12px;
}

html, body{
  width:100%;
  min-height:100%;
  overflow-x:hidden;
}

body{
  font-family:"Poppins",sans-serif;
  background: linear-gradient(135deg, var(--brand-a), var(--brand-b));
  min-height:100svh;
  color:#fff;
  position:relative;
  display:flex;
  flex-direction:column;
  overflow-x:hidden;
}

#back-btn{
  position:fixed;
  top:20px;
  left:20px;
  z-index:120;
  width:48px;
  height:48px;
  padding:0;
  border-radius:50%;
  border:none;
  cursor:pointer;
  background: var(--glass-bg);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  box-shadow: 0 5px 15px rgba(0,0,0,0.25);
  display:flex;
  align-items:center;
  justify-content:center;
  transition: transform .3s ease, box-shadow .3s ease, background .3s ease;
}

#back-btn img{
  width:22px;
  height:22px;
  object-fit:contain;
  transform:scaleX(-1);
  user-select:none;
  -webkit-user-drag:none;
}

#back-btn:hover{
  transform:translateY(-2px);
  box-shadow:0 7px 20px rgba(0,0,0,0.3);
  background:rgba(255,255,255,0.24);
}

.lava-bg{
  position:fixed;
  inset:0;
  z-index:0;
  pointer-events:none;
  overflow:hidden;
}

.lava-bg span{
  position:absolute;
  display:block;
  border-radius:50%;
  background: radial-gradient(
    circle at 30% 30%,
    rgba(255,255,255,0.3),
    rgba(255,255,255,0) 70%
  );
}

.page-main{
  position:relative;
  z-index:10;
  width:100%;
  flex:1 0 auto;
  display:flex;
  justify-content:center;
  align-items:center;
  padding:24px;
  min-height:100svh;
}

/* START SCREEN */
.screen{
  position:relative;
  z-index:10;
  width:100%;
  max-width:650px;
  margin:0 auto;
  padding:35px 30px;
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border-radius:20px;
  box-shadow: 0 10px 30px var(--glass-shadow);

  display:flex;
  flex-direction:column;
  align-items:center;
  text-align:center;
}

.screen h2{
  font-size:26px;
  font-weight:600;
  margin-bottom:18px;
  text-shadow: 0 2px 6px rgba(0,0,0,0.5);
}

.filters-row{
  width:80%;
  display:flex;
  gap:12px;
  margin-bottom:12px;
}

#set-select,
#type-filter,
#student-filter{
  position:absolute !important;
  left:-9999px !important;
  width:1px !important;
  height:1px !important;
  opacity:0 !important;
  pointer-events:none !important;
}

.wl-dd{
  width:80%;
  position:relative;
  z-index:12;
}

.filters-row .wl-dd{ width:100%; }

.wl-dd-btn,
.wl-dd-menu{
  position:relative;
  border-radius:22px;
  border:none;
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  box-shadow: 0 12px 34px rgba(0,0,0,0.28);
  overflow:hidden;
  overscroll-behavior:none;
  background-image:none !important;
}

.wl-dd-btn::before,
.wl-dd-btn::after,
.wl-dd-menu::before,
.wl-dd-menu::after{
  content:none !important;
  display:none !important;
}

.wl-dd-btn{
  width:100%;
  outline:none;
  cursor:pointer;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:12px;
  padding:12px 16px;
  color:#fff;
  font:700 16px "Poppins",sans-serif;
  transition: transform .22s ease, box-shadow .22s ease, opacity .22s ease, background .22s ease;
}

.wl-dd-btn:hover{
  transform:translateY(-1px);
  box-shadow:0 14px 38px rgba(0,0,0,0.34);
  background: var(--glass-bg-2);
}

.wl-dd-btn:disabled{
  opacity:0.62;
  cursor:not-allowed;
  transform:none;
}

.wl-dd-label{
  flex:1;
  min-width:0;
  text-align:left;
  white-space:nowrap;
  overflow:hidden;
  text-overflow:ellipsis;
}

.wl-dd-caret{
  font-size:10px;
  transform:translateY(1px);
  opacity:0.95;
}

.wl-dd-menu{
  padding:10px 0;
  display:none;
  overflow-y:auto;
  overflow-x:hidden;
  clip-path:none !important;
  -webkit-clip-path:none !important;
  -webkit-mask-image:none !important;
  mask-image:none !important;
  overscroll-behavior:none !important;
  background-image:none !important;
}

.wl-dd-menu.floating{
  position:fixed;
  z-index:999999;
  display:block;
}

.wl-dd-item{
  width:100%;
  border:0 !important;
  outline:none !important;
  box-shadow:none !important;
  background:transparent !important;
  background-image:none !important;
  cursor:pointer;
  display:block;
  padding:10px 22px;
  color:rgba(255,255,255,0.98);
  font:600 16px "Poppins",sans-serif;
  text-align:left;
  white-space:nowrap;
  overflow:hidden;
  text-overflow:ellipsis;
  transition: transform .16s ease, opacity .16s ease;
}

.wl-dd-item:hover,
.wl-dd-item:active,
.wl-dd-item:focus,
.wl-dd-item:focus-visible,
.wl-dd-item[aria-selected="true"]{
  background:transparent !important;
  background-image:none !important;
  box-shadow:none !important;
  outline:none !important;
}

.wl-dd-item:hover{ transform:translateX(2px); opacity:1; }
.wl-dd-item[aria-selected="true"]{ font-weight:800; opacity:1; }

.wl-dd-item:disabled{
  opacity:0.52;
  cursor:not-allowed;
  transform:none !important;
}

.wl-dd[data-dd-for="set-select"]{ margin-bottom:25px; }

.wl-dd-search-wrap{
  position:sticky;
  top:0;
  z-index:5;
  padding:8px 14px 10px;
  background:transparent !important;
  backdrop-filter:none !important;
  -webkit-backdrop-filter:none !important;
}

.wl-dd-search{
  width:100%;
  height:36px;
  border-radius:16px;
  outline:none;
  background:transparent !important;
  border:1px solid rgba(255,255,255,0.18);
  color:rgba(255,255,255,0.96);
  padding:8px 12px;
  font:600 13px "Poppins",sans-serif;
  letter-spacing:0.2px;
  box-shadow:none !important;
}

.wl-dd-search::placeholder{
  color:rgba(255,255,255,0.62);
  font-weight:600;
}

.wl-dd-search:focus{
  border-color:rgba(255,255,255,0.30);
  background:transparent !important;
}

#start-btn{
  padding:12px 30px;
  font-size:16px;
  font-weight:600;
  border-radius:12px;
  border:none;
  cursor:pointer;
  background: linear-gradient(145deg, #9b4fff, #d85fff);
  color:#fff;
  box-shadow: 0 5px 15px rgba(0,0,0,0.25);
  transition: transform .3s ease, box-shadow .3s ease;
}

#start-btn:hover{
  transform:translateY(-2px);
  box-shadow:0 7px 20px rgba(0,0,0,0.3);
}

.wl-dd-menu{
  scrollbar-width:thin;
  scrollbar-color:rgba(255,255,255,0.55) transparent;
}

.wl-dd-menu::-webkit-scrollbar{ width:10px; }

.wl-dd-menu::-webkit-scrollbar-track{
  background:transparent !important;
  border:none !important;
  box-shadow:none !important;
  margin:0 !important;
  border-radius:0 !important;
}

.wl-dd-menu::-webkit-scrollbar-thumb{
  background:rgba(255,255,255,0.42) !important;
  border-radius:999px;
  border:2px solid transparent !important;
  background-clip:padding-box !important;
}

.wl-dd-menu::-webkit-scrollbar-thumb:hover{
  background:rgba(255,255,255,0.52) !important;
}

/* GAME */
.container{
  position:relative;
  z-index:100;
  display:none;
  width:100%;
  min-height:100svh;
  align-items:center;
  justify-content:center;
  padding:24px;
  flex:1 0 auto;
}

.choice-card{
  width:650px;
  max-width:92vw;
  padding:32px 30px 26px;

  background: rgba(255,255,255,0.15);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-radius:20px;
  box-shadow: 0 10px 30px rgba(0,0,0,0.25);

  display:flex;
  flex-direction:column;
  align-items:center;
  text-align:center;
  gap:14px;
}

.choice-title{
  font-size:24px;
  font-weight:600;
  text-shadow: 0 2px 6px rgba(0,0,0,0.5);
}

.choice-subtitle{
  font-size:14px;
  opacity:.92;
}

.choice-row{
  width:100%;
  display:flex;
  gap:18px;
  align-items:center;
  justify-content:space-between;
  margin-top:4px;
}

.question-box{
  width:50%;
  display:flex;
  flex-direction:column;
  justify-content:center;
  align-items:center;
  gap:10px;
}

.question-pill{
  padding:14px 18px;
  border-radius:18px;
  background: rgba(255,255,255,0.2);
  box-shadow: 0 5px 15px rgba(0,0,0,0.25);
  line-height:1.3;
  animation: float 3s ease-in-out infinite;
}

.question-pill-audio{
  width:100%;
  min-height:190px;
  display:flex;
  align-items:center;
  justify-content:center;
  padding:12px;
}

.sound-btn{
  width:100%;
  max-width:230px;
  height:230px;
  border:none;
  border-radius:14px;
  cursor:pointer;
  background: rgba(255,255,255,0.10);
  box-shadow: 0 5px 15px rgba(0,0,0,0.18);
  display:flex;
  align-items:center;
  justify-content:center;
  transition:.2s;
}

.sound-btn:hover:not(:disabled){
  background: rgba(255,255,255,0.22);
  transform:translateY(-2px);
}

.sound-btn:active:not(:disabled){
  transform:translateY(-1px) scale(0.99);
}

.sound-btn:disabled{
  opacity:.55;
  cursor:default;
  transform:none;
}

.sound-icon{
  width:96px;
  height:96px;
  object-fit:contain;
  user-select:none;
  -webkit-user-drag:none;
  opacity:.95;
}

.question-fallback{
  font-size:14px;
  opacity:.85;
  background: rgba(255,255,255,0.18);
  padding:8px 12px;
  border-radius:12px;
}

@keyframes float{
  0%,100%{ transform:translateY(0); }
  50%{ transform:translateY(-6px); }
}

.choice-options{
  width:50%;
  display:flex;
  flex-direction:column;
  gap:10px;
}

.choice-btn{
  width:100%;
  padding:12px 20px;
  font-size:18px;
  font-weight:600;
  border-radius:14px;
  border:none;
  background: rgba(255,255,255,0.20);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  color:#fff;
  box-shadow: 0 5px 15px rgba(0,0,0,0.2);
  cursor:pointer;
  transition:.2s;
}

.choice-btn:hover:not(:disabled){
  background: rgba(255,255,255,0.35);
  transform:translateY(-2px);
}

.choice-btn.correct{ background: rgba(46, 204, 113, 0.8); }
.choice-btn.wrong{ background: rgba(231, 76, 60, 0.8); }

.feedback{
  min-height:22px;
  font-size:16px;
  margin-top:4px;
}

.feedback.good{ color:#d4ffda; }
.feedback.bad{ color:#ffe0e0; }

.primary-btn,
#next-btn{
  padding:12px 30px;
  font-size:16px;
  font-weight:600;
  border-radius:12px;
  border:none;
  cursor:pointer;
  background: linear-gradient(145deg, #9b4fff, #d85fff);
  color:#fff;
  box-shadow: 0 5px 15px rgba(0,0,0,0.25);
  transition:.3s;
  margin-top:6px;
}

#next-btn:hover:not(:disabled){
  transform:translateY(-2px);
  box-shadow:0 7px 20px rgba(0,0,0,0.3);
}

#next-btn:disabled{
  opacity:.5;
  cursor:default;
  transform:none;
  box-shadow:0 4px 12px rgba(0,0,0,0.2);
}

/* FINISH */
.finish-screen{
  position:relative;
  inset:auto;
  width:100%;
  min-height:100svh;
  background:transparent;
  display:none;
  justify-content:center;
  align-items:center;
  z-index:100;
  padding:24px;
  flex:1 0 auto;
}

.finish-card{
  width:min(760px, 92vw);
  max-width:92vw;
  background:rgba(255,255,255,0.15);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-radius:20px;
  box-shadow:0 10px 30px rgba(0,0,0,0.25);
  padding:34px 32px;
  text-align:center;
  color:#fff;
}

.finish-card h2{
  margin-bottom:14px;
  font-size:1.8rem;
}

#finish-return-btn,
#round-continue-btn{
  padding:12px 30px;
  font-size:16px;
  font-weight:600;
  border-radius:12px;
  border:none;
  cursor:pointer;
  background: linear-gradient(145deg, #9b4fff, #d85fff);
  color:#fff;
  transition:.3s;
  box-shadow:0 7px 20px rgba(0,0,0,0.25);
}

#finish-return-btn:hover,
#round-continue-btn:hover{
  transform:translateY(-2px);
  box-shadow:0 10px 26px rgba(0,0,0,0.3);
}

.site-footer{
  position:relative;
  z-index:10;
  width:100%;
  margin-top:auto;
  padding:0;
  background:rgba(255,255,255,0.12);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  box-shadow:0 -10px 28px rgba(0,0,0,0.10);
  flex:0 0 auto;
}

.footer-glass{
  width:100%;
  max-width:1200px;
  margin:0 auto;
  padding:20px 24px;
  display:flex;
  justify-content:space-between;
  align-items:flex-start;
  gap:40px;
}

.footer-left,
.footer-right{
  min-width:0;
}

.footer-left{
  display:flex;
  flex-direction:column;
  gap:8px;
}

.footer-owner{
  font-size:15px;
  font-weight:600;
  line-height:1.5;
  color:rgba(255,255,255,0.96);
}

.footer-email{
  font-size:14px;
  line-height:1.5;
  color:rgba(255,255,255,0.88);
  text-decoration:none;
  word-break:break-word;
  transition: opacity .2s ease;
}

.footer-email:hover{
  opacity:0.82;
}

.footer-copy{
  margin-top:4px;
  font-size:13px;
  line-height:1.5;
  color:rgba(255,255,255,0.72);
}

.footer-right{
  display:flex;
  flex-direction:column;
  align-items:flex-end;
  gap:8px;
}

.footer-doc-link{
  font-size:14px;
  line-height:1.5;
  color:rgba(255,255,255,0.93);
  text-decoration:none;
  transition: opacity .2s ease, transform .2s ease;
  text-align:right;
}

.footer-doc-link:hover{
  opacity:0.82;
  transform:translateX(-2px);
}

@media (max-width: 1024px){
  .page-main{
    min-height:100svh;
    align-items:center;
  }

  .container{
    min-height:100svh;
    align-items:center;
  }

  .finish-screen{
    min-height:100svh;
    align-items:center;
    padding:24px;
  }

  .finish-card{
    margin-top:0;
  }
}

@media (max-width: 768px){
  .page-main{
    min-height:100svh;
    align-items:center;
  }

  .container{
    min-height:100svh;
    align-items:center;
  }

  .finish-screen{
    min-height:100svh;
    align-items:center;
    padding:24px;
  }

  .finish-card{
    width:min(760px, 100%);
  }

  .choice-row{
    flex-direction:column;
  }

  .question-box,
  .choice-options{
    width:100%;
  }

  .question-pill-audio{
    min-height:210px;
  }
}

@media (max-width: 520px){
  .filters-row{
    flex-direction:column;
    gap:10px;
    margin-bottom:10px;
    width:100%;
  }

  .wl-dd{ width:100%; }

  #start-screen{
    max-width:360px;
    padding:24px 16px;
  }

  #start-screen h2{
    font-size:22px;
    margin-bottom:14px;
  }

  .wl-dd-btn{
    font-size:15px;
    padding:11px 14px;
    border-radius:18px;
  }

  .wl-dd[data-dd-for="set-select"]{
    margin-bottom:10px;
  }

  #start-btn{
    width:100%;
    max-width:220px;
    padding:12px 20px;
    font-size:15px;
  }

  .page-main{
    min-height:100svh;
    align-items:center;
    padding:24px 14px;
  }

  .container{
    min-height:100svh;
    align-items:center;
    padding:24px 14px;
  }

  .choice-card{
    width:100%;
    max-width:100%;
    padding:25px 15px;
  }

  .choice-title{
    font-size:22px;
  }

  .choice-subtitle{
    font-size:13px;
  }

  .question-pill-audio{
    min-height:190px;
    padding:10px;
  }

  .sound-btn{
    max-width:210px;
    height:210px;
  }

  .sound-icon{
    width:84px;
    height:84px;
  }

  .choice-btn{
    font-size:16px;
    padding:11px 14px;
  }

  .finish-screen{
    min-height:100svh;
    padding:24px 14px;
    align-items:center;
  }

  .finish-card{
    padding:24px 14px;
  }

  .finish-card h2{
    font-size:1.35rem;
  }

  .footer-glass{
    flex-direction:column;
    gap:14px;
    padding:16px 14px 14px;
  }

  .footer-right{
    align-items:flex-start;
    gap:4px;
  }

  .footer-doc-link{
    text-align:left;
    font-size:10.5px;
    line-height:1.28;
    opacity:0.9;
  }

  .footer-owner,
  .footer-email{
    font-size:12px;
  }

  .footer-copy{
    font-size:11px;
  }
}

@media (max-width: 390px){
  #start-screen{
    max-width:340px;
    padding:22px 14px;
  }

  #start-screen h2{
    font-size:20px;
  }

  .wl-dd-btn{
    font-size:14px;
    padding:10px 13px;
  }

  .page-main,
  .container,
  .finish-screen{
    padding-left:12px;
    padding-right:12px;
  }

  .choice-card{
    padding:22px 13px;
  }

  .sound-btn{
    max-width:190px;
    height:190px;
  }

  .sound-icon{
    width:74px;
    height:74px;
  }
}