/* ═══════════════════════════════
   EVOLUXX Survey — Mobile First CSS
   ═══════════════════════════════ */

/* ── Reset & Base ─────────────────*/
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --blue:    #1B3A5C;
  --blue-l: #378ADD;
  --blue-ll: #B5D4F4;
  --teal:    #008CBA;
  --teal-l: #1D9E75;
  --orange:  #F07C00;
  --gray:    #888888;
  --gray-l: #F2F2F2;
  --white:   #FFFFFF;
  --dark:    #0D1B2A;
  --text:    #333333;
  --radius:  12px;
  --radius-sm:8px;
}

html { font-size: 16px; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background: var(--gray-l);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* ── Survey Container ───────────────*/
.survey-container {
  max-width: 480px;
  margin: 0 auto;
  min-height: 100vh;
  background: var(--white);
  position: relative;
  box-shadow: 0 0 30px rgba(0,0,0,.08);
}

/* ── Screens ───────────────────────*/
.survey-screen {
  display: none;
  min-height: 100vh;
  padding: 24px 24px;
  flex-direction: column;
}
.survey-screen.active { display: flex; }

/* ── Landing ──────────────────────*/
.survey-landing-inner {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 40px 0;
}

.landing-desc {
  background: #F0F6FA;
  border-radius: var(--radius);
  padding: 16px 18px;
  margin-bottom: 28px;
  text-align: left;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--text);
}

.landing-desc p { margin-bottom: 6px; }
.landing-meta {
  font-size: 12px;
  color: var(--teal);
  margin-top: 4px;
}

/* ── Buttons ───────────────────────*/
.btn-primary {
  background: var(--blue);
  color: var(--white);
  border: none;
  border-radius: var(--radius);
  padding: 14px 48px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: background .2s, transform .1s;
  -webkit-tap-highlight-color: transparent;
}
.btn-primary:active { transform: scale(.97); background: #122A45; }
.btn-lg { width: 100%; max-width: 300px; padding: 16px; }

.btn-icon {
  width: 40px; height: 40px;
  border: none;
  background: transparent;
  font-size: 22px;
  color: var(--blue);
  cursor: pointer;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
}
.btn-icon:active { background: var(--gray-l); }

.btn-text-sm {
  background: none; border: none;
  font-size: 12px; color: var(--gray);
  cursor: pointer; padding: 4px 8px;
}

/* ── Top Bar ──────────────────────*/
.survey-topbar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 0 12px;
  border-bottom: 1px solid #E8E8E8;
  margin-bottom: 16px;
}

.survey-progress-wrap {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.survey-part-label {
  font-size: 11px;
  font-weight: 600;
  color: var(--blue-l);
  text-transform: uppercase;
  letter-spacing: .5px;
}

.survey-progress-bar {
  height: 5px;
  background: var(--gray-l);
  border-radius: 3px;
  overflow: hidden;
}

.survey-progress-fill {
  height: 100%;
  background: var(--teal);
  border-radius: 3px;
  transition: width .4s cubic-bezier(.4,0,.2,1);
  width: 0%;
}

.survey-step-label {
  font-size: 11px;
  color: var(--gray);
  white-space: nowrap;
}

.topbar-right { margin-left: auto; }

/* ── Question ──────────────────────*/
.survey-body {
  flex: 1;
  display: flex;
  flex-direction: column;
  opacity: 1;
  transition: opacity .25s;
}

.survey-question-wrap { margin-bottom: 20px; }

.survey-question-label {
  font-size: 11px;
  font-weight: 600;
  color: var(--teal);
  text-transform: uppercase;
  letter-spacing: .5px;
  margin-bottom: 6px;
}

.survey-question-text {
  font-size: 17px;
  font-weight: 600;
  color: var(--dark);
  line-height: 1.5;
}

.survey-question-note {
  font-size: 11.5px;
  color: var(--gray);
  font-style: italic;
  margin-top: 6px;
  display: none;
}

/* ── Options ──────────────────────*/
.survey-options {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 16px;
}

.opt-btn {
  display: flex;
  align-items: center;
  gap: 12px;
  width: 100%;
  padding: 14px 16px;
  border: 1.5px solid #D8D8D8;
  border-radius: var(--radius);
  background: var(--white);
  cursor: pointer;
  transition: border-color .2s, background .2s, transform .1s;
  -webkit-tap-highlight-color: transparent;
  text-align: left;
}
.opt-btn:active { transform: scale(.985); }

.opt-letter {
  flex-shrink: 0;
  width: 28px; height: 28px;
  border-radius: 50%;
  background: var(--gray-l);
  color: var(--gray);
  font-size: 13px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background .2s, color .2s;
}

.opt-text {
  font-size: 14px;
  color: var(--text);
  line-height: 1.4;
}

.opt-btn.selected {
  border-color: var(--teal);
  background: #E6F7F0;
}
.opt-btn.selected .opt-letter {
  background: var(--teal);
  color: var(--white);
}

/* ── Open / Text Input ────────────*/
.survey-open { margin-top: 8px; }

.open-input {
  width: 100%;
  padding: 12px 14px;
  border: 1.5px solid #D8D8D8;
  border-radius: var(--radius);
  font-size: 15px;
  color: var(--text);
  outline: none;
  transition: border-color .2s;
  -webkit-appearance: none;
  border-radius: var(--radius) !important;
}
.open-input:focus { border-color: var(--teal); }

.btn-text-next {
  display: block;
  width: 100%;
  margin-top: 16px;
  padding: 12px;
  background: var(--blue);
  color: var(--white);
  border: none;
  border-radius: var(--radius);
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: background .2s;
  -webkit-tap-highlight-color: transparent;
}
.btn-text-next:active { background: #122A45; }

.followup-wrap {
  margin-top: 12px;
  padding-left: 16px;
  border-left: 3px solid var(--teal-l);
}
.followup-label { font-size: 12.5px; color: var(--gray); margin-bottom: 6px; }
.followup-input { width: 100%; }

/* ── MVP Score ───────────────────*/
.mvp-score-wrap {
  margin-top: 14px;
  padding: 12px 14px;
  background: #F0F6FA;
  border-radius: var(--radius-sm);
}
.score-label { font-size: 12.5px; color: var(--gray); margin-bottom: 6px; }
.score-input {
  width: 80px;
  padding: 8px 10px;
  border: 1.5px solid #D8D8D8;
  border-radius: var(--radius-sm);
  font-size: 18px;
  text-align: center;
  outline: none;
}
.score-input:focus { border-color: var(--teal); }

/* ── Complete Screen ──────────────*/
.survey-complete-inner {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
}

.complete-icon {
  width: 64px; height: 64px;
  border-radius: 50%;
  background: var(--teal);
  color: var(--white);
  font-size: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
}

.survey-complete-inner h2 {
  font-size: 22px;
  color: var(--dark);
  margin-bottom: 10px;
}
.survey-complete-inner p {
  font-size: 13.5px;
  color: var(--gray);
  line-height: 1.6;
  margin-bottom: 20px;
}

/* ── Contact Form ─────────────────*/
.contact-form {
  width: 100%;
  max-width: 320px;
  margin-bottom: 20px;
  text-align: left;
}
.contact-hint {
  font-size: 12.5px;
  color: var(--gray);
  margin-bottom: 12px;
}
.form-row { margin-bottom: 10px; }
.form-row input {
  width: 100%;
  padding: 11px 13px;
  border: 1.5px solid #D8D8D8;
  border-radius: var(--radius-sm);
  font-size: 14px;
  outline: none;
  transition: border-color .2s;
}
.form-row input:focus { border-color: var(--teal); }

.submit-msg {
  font-size: 13px;
  margin-top: 10px;
  min-height: 20px;
}

/* ── Concept Box (p6) ─────────────*/
.concept-block {
  background: #F0F6FA;
  border-radius: var(--radius);
  padding: 14px 16px;
  margin-bottom: 18px;
  text-align: left;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--text);
}
.concept-intro {
  font-weight: 700;
  color: var(--blue);
  display: block;
  margin-bottom: 6px;
  font-size: 13.5px;
}
.concept-list {
  margin: 6px 0 0 16px;
  padding: 0;
}
.concept-list li {
  margin-bottom: 3px;
  color: var(--text);
}

/* ── Responsive ───────────────────*/
@media (min-width: 481px) {
  .survey-container {
    margin-top: 20px;
    margin-bottom: 20px;
    border-radius: 16px;
    overflow: hidden;
    min-height: calc(100vh - 40px);
  }
}

/* ── Animations ───────────────────*/
@keyframes fadeSlideIn {
  from { opacity: 0; transform: translateY(12px); }
  to   { opacity: 1; transform: translateY(0); }
}
.survey-body { animation: fadeSlideIn .3s ease-out; }