:root{
  --bg: #0f0f0f;
  --card: #121212;
  --accent: #0096c7;
  --muted: #9aa8b3;
  --text: #e6eef3;
  --danger: rgb(224, 90, 90);
  --success: #28a745;
}
*{
  box-sizing:border-box;
  padding: 0;
  margin: 0;
}
html,body{
  min-height: 100%;
  margin:0;
  background:var(--bg);
  color:var(--text);
  font-family:Inter, ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
  line-height:1.4;
  display: flex;
  flex-direction: column;
  justify-content: center;
  overflow-y: auto;
}
.hidden{
  display: none;
}
header{
  width: 100%;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  padding: 10px;
  text-align: center;
}
.logo-container{
  height: 48px;
  display: flex;
  flex-direction: row;
  align-items: center;
}
header h1{
  font-size:24px;
}
header p{
  font-size: 14px;
  padding: 4px;
  color: var(--muted);
}
header .logo-container P{
  font-size: 20px;
  font-weight: 700;
  color: #fff;
}
header img{
  height: 100%;
}
#app{
  display:flex;
  align-items:center;
  justify-content:center;
  padding:8px;
}
/* screens */
.screen{ 
  display:none; 
  width:100%; 
  max-width:750px; 
  padding:12px; 
}
.screen.active{ 
  display:block; 
}
.card{
  background: linear-gradient(180deg, rgba(255,255,255,0.02), transparent);
  border-radius:12px;
  padding:24px;
  box-shadow: 0 6px 30px rgba(0,0,0,0.6);
  border:1px solid rgba(255,255,255,0.03);
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}
/* header */
h2{
  margin:0 0 10px 0;
  font-size:20px;
  letter-spacing:0.2px;
}
/* muted text */
.muted{
  color:var(--muted);
}
.small{ 
  font-size:16px; 
  margin-top:6px; 
}
/* rows */
.row{ 
  display:flex; 
  align-items:center; 
  gap:12px; 
  margin-top:14px;
}
.row.buttons{ 
  justify-content:flex-end; 
  margin-top:20px; 
}
/* inputs */
input[type="range"]{ 
  width:220px; 
}
input[type="number"]{
  width:72px;
  padding:8px;
  border-radius:8px;
  background:transparent;
  border:1px solid rgba(255,255,255,0.04);
  color:var(--text);
}
input[type="text"]{
  width:100%;
  padding:12px;
  border-radius:8px;
  border:1px solid rgba(255,255,255,0.04);
  background:transparent;
  color:var(--text);
  font-size:16px;
  margin: 5px;
}
input[type=number]::-webkit-inner-spin-button,
input[type=number]::-webkit-outer-spin-button {
  -webkit-appearance: none;
  margin: 0;
}
input[type=number] {
  -moz-appearance: textfield;
}
input[type="file"]{ 
  display:none; 
}
/* buttons */
.btn{
  background:transparent;
  color:var(--text);
  border:1px solid rgba(255, 255, 255, 0.5);
  padding:10px 14px;
  border-radius:10px;
  cursor:pointer;
  font-weight:600;
  margin: 5px;
  transition: all 0.2s ease;
}
.btn:hover{
  background:rgba(255,255,255,0.03);
  padding: 10px 16px;
}
.btn.primary{
  background:linear-gradient(90deg,var(--accent), #00a9df);
  border: none;
  color:#051923;
  padding:10px 14px;
  /*box-shadow: 0 6px 20px rgba(0,150,199,0.12);*/
}
.btn.primary:hover{
  /*box-shadow: 0 8px 30px rgba(0,150,199,0.2);*/
  padding: 10px 16px;
}
.btn.danger{
  background:transparent;
  border:1px solid rgba(224,90,90,0.18);
  color:var(--danger);
}
.btn.danger:hover{
  background:rgba(224,90,90,0.02);
  padding: 0 16px;
}
/* upload screen */
#upload-screen td, #upload-screen th{
  padding: 10px;
  font-size: 12px;
  text-align: center;
  border: 1px solid var(--muted);
}
#upload-screen table{
  border-collapse: collapse;
  margin: 5px 0 15px 0;
}
/* test card */
.test-card{ 
  max-width:880px; 
}
.topbar{
  display:flex;
  justify-content:space-between;
  align-items:center;
  margin-bottom:18px;
}
.controls{ 
  display:flex; 
  gap:8px; 
  justify-content: end; 
  margin: 10px;
}
.advanced-settings {
  display: none;
  flex-direction: column;
  align-items: center;
}
#main-screen #toggleAdvanced{
  background: transparent;
  border: none;
  padding: 10px;
  color: white;
  font-size: 16px;
}
/* question area */
.question-area{ 
  padding:20px; 
  border-radius:8px; 
  background:rgba(255,255,255,0.01); 
  border:1px solid rgba(255,255,255,0.02);
  width: 100%;
}
.question-text{
  font-size:18px;
  margin-bottom:12px;
  min-height:52px;
}
/* feedback */
.feedback{ 
  margin-top:12px; 
  padding:10px; 
  border-radius:8px; 
  background:rgba(0,0,0,0.25); 
  border:1px solid rgba(255,255,255,0.02); 
}
.feedback.hidden{ 
  display:none; 
}
.feedback-text{ 
  font-weight:700; 
  margin-bottom:6px; 
}
/* wrong list */
.wrong-list{ 
  margin-top:12px; 
  display:flex; 
  flex-direction:column; 
  gap:10px; 
  max-height:40vh; 
  overflow:auto; 
}
.wrong-item{ 
  padding:12px; 
  border-radius:8px; 
  background:rgba(255,255,255,0.02); 
  border:1px solid rgba(255,255,255,0.02); 
}
.wrong-item .q{ 
  font-weight:600; 
  margin-bottom:6px; 
}
.wrong-item .meta{ 
  color:var(--muted); 
  font-size:13px; 
}
/* report problem */
#problem-screen p{
  padding: 8px;
}
/* csv editor */
#csv-creator-screen label{
  padding: 10px;
}
#csv-creator-screen input[type="text"]{
  max-width: 300px;
}
.csvRow{
  display: flex;
  flex-direction: row;
  justify-content: center;
  align-items: center;
  padding: 5px;
}
/* footer */
.footer{ 
  text-align:center; 
  color:var(--muted); 
  width: 100%;
  padding: 10px;
  font-size: 15px;
  display: flex;
  align-items: center;
  flex-direction: column;
}
.footer a{
  color: var(--danger);
  padding: 8px;
  font-size: 14px;
}
/* responsiveness */
@media (max-width:640px){
  .row{ 
    flex-direction:column; 
  }
  input[type="range"]{ 
    width:100%; 
  }
  .controls{
    gap:6px;
  }
  .csvRow{
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 0;
  }
  .csvRow div{
    width: 100%;
    display: flex;
    justify-content: end;
  }
  .dragHandle{
    display: none;
  }
}