:root{
  /* фиксированная палитра — одинаково у всех */
  --bg: #0f1115;
  --text: #e6e8eb;
  --hint: #c6ccd6;
  --button: #2ea6ff;
  --button-text: #101215;

  --card: rgba(255,255,255,0.03);
  --border: rgba(255,255,255,0.08);

  --radius: 14px;
}

*{ box-sizing: border-box; }
html, body {
  height: 100%;
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.45 -apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Ubuntu,Helvetica Neue,Arial,"Noto Sans",sans-serif;
}

/* Шапка */
header{
  padding: 20px 18px 8px;
  border-bottom: 1px solid var(--border);
  background: linear-gradient(180deg, rgba(255,255,255,0.02), transparent);
}
header h1{ margin: 0 0 6px; font-size: 20px; font-weight: 700; }
.muted{ margin: 0; color: var(--hint); font-size: 13px; }

/* Контейнер вопросов */
.question-list, #items{
  padding: 14px 14px 96px; /* место под липкую кнопку */
  display: grid;
  gap: 14px;
}

/* Карточка */
.question{
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px 12px;
  transition: background-color .18s ease, border-color .18s ease,
              filter .18s ease, box-shadow .22s ease, color .18s ease, opacity .18s ease;
}
.question.lit{
  background: rgba(255,255,255,0.06);
  border-color: rgba(255,255,255,0.26);
  filter: brightness(1.12);
  box-shadow:
    0 0 0 1px rgba(255,255,255,0.06) inset,
    0 6px 20px rgba(0,0,0,0.25),
    0 0 18px rgba(255,255,255,0.10);
}
.question.locked{
  opacity: .65;
  filter: grayscale(.1) brightness(.95);
}

/* номер */
.q-index{ color: var(--hint); font-size: 12px; margin-bottom: 10px; }

/* ряд */
.q-row{
  display: grid;
  grid-template-columns: 1fr minmax(120px, 420px) 1fr;
  align-items: center;
  gap: 12px;
}

/* подписи */
.q-label{
  color: var(--hint);
  font-size: 13px;
  min-width: 0;
  white-space: nowrap;
  text-overflow: ellipsis;
  overflow: hidden;
  display: block;
  line-height: 1.25;
}
.q-label.left{ text-align: left; }
.q-label.right{ text-align: right; }
.question.lit .q-label{ color: rgba(230,232,235,0.92); }

/* слайдер */
.q-slider{
  appearance: none;
  width: 100%;
  background: transparent;
  outline: none;
  height: 28px;
  cursor: pointer;
}
.q-slider:disabled{
  cursor: not-allowed;
  opacity: .7;
}

/* трек */
.q-slider::-webkit-slider-runnable-track{
  height: 6px;
  background: linear-gradient(90deg,
    rgba(255,255,255,0.12), rgba(255,255,255,0.22));
  border-radius: 999px;
}
.q-slider::-moz-range-track{
  height: 6px;
  background: linear-gradient(90deg,
    rgba(255,255,255,0.12), rgba(255,255,255,0.22));
  border-radius: 999px;
}
.question.lit .q-slider::-webkit-slider-runnable-track{
  background: linear-gradient(90deg,
    rgba(255,255,255,0.26), rgba(255,255,255,0.38));
}
.question.lit .q-slider::-moz-range-track{
  background: linear-gradient(90deg,
    rgba(255,255,255,0.26), rgba(255,255,255,0.38));
}

/* бегунок */
.q-slider::-webkit-slider-thumb{
  appearance: none;
  margin-top: -8px;
  width: 22px; height: 22px;
  border-radius: 50%;
  background: white;
  border: 2px solid rgba(0,0,0,0.22);
  box-shadow: 0 2px 8px rgba(0,0,0,0.35);
}
.q-slider::-moz-range-thumb{
  width: 22px; height: 22px;
  border-radius: 50%;
  background: white;
  border: 2px solid rgba(0,0,0,0.22);
  box-shadow: 0 2px 8px rgba(0,0,0,0.35);
}
.question.lit .q-slider::-webkit-slider-thumb{
  box-shadow:
    0 2px 8px rgba(0,0,0,0.35),
    0 0 12px rgba(255,255,255,0.35);
}
.question.lit .q-slider::-moz-range-thumb{
  box-shadow:
    0 2px 8px rgba(0,0,0,0.35),
    0 0 12px rgba(255,255,255,0.35);
}

/* Липкая зона с кнопкой */
.actions{
  position: fixed; left: 0; right: 0; bottom: 0;
  padding: 10px 14px 16px;
  background: linear-gradient(180deg, transparent, rgba(0,0,0,0.35) 30%);
  backdrop-filter: blur(4px);
}

/* Кнопка */
#submit-btn, .submit-btn{
  position: relative;
  width: 100%;
  padding: 14px 16px;
  border: none;
  border-radius: 12px;
  background: var(--button);
  color: var(--button-text);
  font-size: 16px;
  font-weight: 700;
  transition: opacity .12s ease, transform .05s ease, filter .12s ease;
}
#submit-btn:active, .submit-btn:active{ transform: translateY(1px); }

/* обычный disabled (пока не все вопросы зажжены) */
#submit-btn[disabled]:not(.is-loading), .submit-btn[disabled]:not(.is-loading){
  opacity:.55; filter:grayscale(.1) brightness(.9); pointer-events:none;
}

/* состояние "отправляю" — НЕ тускнеет, есть спиннер, клики блокируются */
#submit-btn.is-loading, .submit-btn.is-loading{
  opacity:1; filter:none; pointer-events:none;
}
#submit-btn.is-loading::after, .submit-btn.is-loading::after{
  content:"";
  position:absolute; right:14px; top:50%;
  width:18px; height:18px; margin-top:-9px;
  border:2px solid rgba(255,255,255,.65);
  border-top-color: transparent;
  border-radius:50%;
  animation: spin .8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* Мобилка: 3 строки — верхний лейбл → слайдер → нижний лейбл */
@media (max-width: 460px){
  .q-row{
    grid-template-columns: 1fr;
    grid-template-rows: auto 28px auto;
    gap: 8px;
  }
  .q-label{ text-align: left; margin: 0; }
}