/* =============================================
   Small Helix — Diagnose Page Styles
   One-question-per-screen interaction (Light theme)
   ============================================= */

/* Question Container */
.questionnaire {
  max-width: 600px;
  margin: 0 auto;
  padding: 100px var(--space-md) var(--space-xl);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
}

/* Question Meta (step counter) */
.questionnaire__meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-xl);
}

.questionnaire__module {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-accent);
  letter-spacing: 1px;
  font-weight: 500;
}

.questionnaire__step {
  font-size: 13px;
  color: var(--color-text-muted);
}

.questionnaire__step span {
  color: var(--color-text);
  font-weight: 600;
}

/* Question Text */
.questionnaire__question {
  font-size: clamp(22px, 4.5vw, 30px);
  font-weight: 600;
  line-height: 1.35;
  margin-bottom: var(--space-2xl);
  letter-spacing: -0.3px;
  color: var(--color-text);
}

/* Option Cards */
.options {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  flex-grow: 1;
}

.option-card {
  background: var(--color-bg-card);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 18px 20px;
  font-size: 16px;
  color: var(--color-text);
  cursor: pointer;
  transition: all var(--transition-fast);
  text-align: left;
  line-height: 1.5;
  position: relative;
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.option-card:hover {
  border-color: var(--color-accent);
  background: var(--color-bg-card-hover);
}

.option-card.selected {
  border-color: var(--color-accent);
  background: var(--color-accent-soft);
}

/* Radio indicator (single select) */
.option-card__indicator--radio {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  border: 2px solid var(--color-border);
  flex-shrink: 0;
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  justify-content: center;
}

.option-card.selected .option-card__indicator--radio {
  border-color: var(--color-accent);
  background: var(--color-accent);
}

.option-card.selected .option-card__indicator--radio::after {
  content: '';
  width: 8px;
  height: 8px;
  background: #fff;
  border-radius: 50%;
}

/* Checkbox indicator (multi select) */
.option-card__indicator--checkbox {
  width: 20px;
  height: 20px;
  border-radius: 5px;
  border: 2px solid var(--color-border);
  flex-shrink: 0;
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  justify-content: center;
}

.option-card.selected .option-card__indicator--checkbox {
  border-color: var(--color-accent);
  background: var(--color-accent);
}

.option-card.selected .option-card__indicator--checkbox::after {
  content: '';
  width: 6px;
  height: 10px;
  border: 2px solid #fff;
  border-top: none;
  border-left: none;
  transform: rotate(45deg) translateY(-1px);
}

/* Other text input */
.option-card__other-input {
  margin-top: var(--space-sm);
  width: 100%;
  padding: 12px 16px;
  font-size: 15px;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-bg);
  color: var(--color-text);
  font-family: inherit;
  line-height: 1.5;
  outline: none;
  transition: border-color 0.2s ease;
  display: none;
}

.option-card__other-input.visible {
  display: block;
}

.option-card__other-input:focus {
  border-color: var(--color-accent);
}

.option-card__other-input::placeholder {
  color: var(--color-text-muted);
}

/* Navigation Buttons */
.questionnaire__nav {
  display: flex;
  justify-content: space-between;
  padding-top: var(--space-xl);
  margin-top: auto;
}

.nav-btn {
  padding: 12px 32px;
  border-radius: var(--radius-md);
  font-size: 15px;
  font-weight: 500;
  transition: all var(--transition-fast);
}

.nav-btn--prev {
  color: var(--color-text-secondary);
  border: 1px solid var(--color-border);
}

.nav-btn--prev:hover {
  border-color: var(--color-text-muted);
  color: var(--color-text);
}

.nav-btn--next {
  background: var(--color-accent);
  color: #fff;
  opacity: 0.4;
  pointer-events: none;
}

.nav-btn--next.active {
  opacity: 1;
  pointer-events: auto;
}

.nav-btn--next.active:hover {
  background: var(--color-accent-hover);
  transform: translateY(-1px);
}

.nav-btn--submit {
  background: var(--color-accent);
  color: #fff;
  opacity: 0.4;
  pointer-events: none;
}

.nav-btn--submit.active {
  opacity: 1;
  pointer-events: auto;
}

.nav-btn--submit.active:hover {
  background: var(--color-accent-hover);
  transform: translateY(-1px);
}

/* Loading State */
.questionnaire__loading {
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 80vh;
  gap: var(--space-xl);
  text-align: center;
}

.questionnaire__loading.visible {
  display: flex;
}

.loading-dna {
  position: relative;
  width: 80px;
  height: 80px;
}

.loading-dna__strand {
  position: absolute;
  width: 12px;
  height: 12px;
  background: var(--color-accent);
  border-radius: 50%;
  animation: dnaRotate 1.6s ease-in-out infinite;
}

.loading-dna__strand:nth-child(2) { animation-delay: 0.2s; }
.loading-dna__strand:nth-child(3) { animation-delay: 0.4s; }
.loading-dna__strand:nth-child(4) { animation-delay: 0.6s; }
.loading-dna__strand:nth-child(5) { animation-delay: 0.8s; }

@keyframes dnaRotate {
  0%   { transform: rotate(0deg)   translateX(28px) rotate(0deg);   opacity: 1; }
  50%  { transform: rotate(180deg) translateX(28px) rotate(-180deg); opacity: 0.4; }
  100% { transform: rotate(360deg) translateX(28px) rotate(-360deg); opacity: 1; }
}

.loading-text {
  font-size: 18px;
  font-weight: 500;
  color: var(--color-text);
}

.loading-subtext {
  font-size: 14px;
  color: var(--color-text-muted);
  max-width: 280px;
}

.finish-float-btn {
  position: fixed;
  right: 18px;
  bottom: calc(18px + env(safe-area-inset-bottom));
  z-index: 40;
  border: 1px solid #d9d6ff;
  background: #ffffff;
  color: #4b3db9;
  border-radius: 999px;
  padding: 10px 14px;
  font-size: 13px;
  font-weight: 600;
  box-shadow: 0 8px 24px rgba(108, 92, 231, 0.16);
  display: none;
}

.finish-float-btn.is-visible {
  display: inline-flex;
}

/* Responsive */
@media (max-width: 640px) {
  .questionnaire { padding: 80px var(--space-md) var(--space-lg); }
  .option-card { padding: 16px; font-size: 15px; }
  .nav-btn { padding: 12px 24px; font-size: 14px; }
}

@media (max-width: 375px) {
  .questionnaire {
    padding: 72px 12px var(--space-md);
  }
  .questionnaire__meta {
    margin-bottom: var(--space-lg);
  }
  .questionnaire__question {
    font-size: 20px;
    margin-bottom: var(--space-xl);
  }
}