:root {
  color-scheme: light;
  --ink: #3a2f27;
  --muted: #8a7a6c;
  --cream: #fdf5ea;
  --paper: #fffcf7;
  --primary: #c2622f;
  --primary-dark: #a44f22;
  --primary-soft: #fbeadd;
  --sage: #8ca78f;
  --sage-soft: #eff4ec;
  --honey: #e8b45c;
  --line: #efe2d2;
  --danger: #b34a3c;
  --shadow: 0 20px 60px rgba(120, 88, 60, 0.1);
  --step: #a44f22;
  --step-soft: #fbeadd;
  font-family:
    ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

.survey-card[data-theme="sky"] {
  --step: #2f6a90;
  --step-soft: #e8f1f7;
}
.survey-card[data-theme="honey"] {
  --step: #96681c;
  --step-soft: #fbf0dc;
}
.survey-card[data-theme="coral"] {
  --step: #b4472f;
  --step-soft: #fbe9e3;
}
.survey-card[data-theme="clay"] {
  --step: #a44f22;
  --step-soft: #fbeadd;
}
.survey-card[data-theme="olive"] {
  --step: #55703f;
  --step-soft: #eef3e7;
}
.survey-card[data-theme="wisteria"] {
  --step: #6d4f96;
  --step-soft: #f1ebf8;
}
.survey-card[data-theme="sage"] {
  --step: #4e7a5a;
  --step-soft: #e9f2ec;
}

.icon-sprite {
  position: absolute;
  width: 0;
  height: 0;
  overflow: hidden;
}

.icon {
  width: 1em;
  height: 1em;
  flex: 0 0 auto;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.75;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.brand-icon {
  fill: currentColor;
  stroke: none;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-width: 320px;
  color: var(--ink);
  background:
    radial-gradient(circle at 6% 0%, rgba(232, 180, 92, 0.22), transparent 30rem),
    radial-gradient(circle at 96% 12%, rgba(194, 98, 47, 0.12), transparent 26rem),
    radial-gradient(circle at 50% 100%, rgba(140, 167, 143, 0.14), transparent 34rem),
    var(--cream);
}

button,
input,
textarea {
  font: inherit;
}

button,
label,
input[type="radio"],
input[type="checkbox"] {
  -webkit-tap-highlight-color: transparent;
}

button:focus-visible,
input:focus-visible,
textarea:focus-visible {
  outline: 3px solid rgba(194, 98, 47, 0.32);
  outline-offset: 2px;
}

.page-shell {
  width: min(1120px, calc(100% - 40px));
  margin: 0 auto;
}

.brand-bar {
  min-height: 76px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  text-decoration: none;
  font-size: 18px;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

.brand-mark {
  width: 36px;
  height: 36px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  color: var(--primary);
  background: var(--primary-soft);
  box-shadow: 0 6px 16px rgba(194, 98, 47, 0.16);
  font-size: 19px;
}

main {
  padding: 24px 0 80px;
}

.survey-card {
  position: relative;
  width: min(780px, 100%);
  margin: 0 auto;
  padding: 40px 48px 44px;
  overflow: hidden;
  border: 1px solid rgba(239, 226, 210, 0.9);
  border-radius: 24px;
  background: var(--paper);
  box-shadow: var(--shadow);
}

.survey-card::before {
  content: "";
  position: absolute;
  inset: 0 0 auto;
  height: 4px;
  background: var(--step);
  opacity: 0.85;
  transition: background 320ms ease;
}

.survey-head {
  padding-bottom: 26px;
  margin-bottom: 26px;
  border-bottom: 1px solid var(--line);
}

.survey-head h1 {
  margin: 0 0 12px;
  font-size: 27px;
  font-weight: 800;
  line-height: 1.35;
  letter-spacing: -0.02em;
}

.survey-note {
  max-width: 56ch;
  margin: 0;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.8;
}

.survey-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 16px 0 0;
  padding: 0;
  list-style: none;
}

.survey-head.is-compact {
  padding-bottom: 18px;
  margin-bottom: 18px;
}

.survey-head.is-compact h1 {
  margin: 0;
  font-size: 17px;
  font-weight: 700;
  color: var(--muted);
}

.survey-head.is-compact .survey-note,
.survey-head.is-compact .survey-meta {
  display: none;
}

.survey-meta li {
  padding: 5px 11px;
  border-radius: 999px;
  color: #8a5b36;
  background: var(--primary-soft);
  font-size: 12px;
  font-weight: 600;
}

.section-kicker {
  margin: 0 0 10px;
  color: var(--step);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.1em;
}

.progress-header {
  display: flex;
  align-items: center;
  gap: 13px;
}

.progress-header h2 {
  flex: 1;
  min-width: 0;
}

.step-icon {
  flex: 0 0 auto;
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  color: var(--step);
  background: var(--step-soft);
  box-shadow: 0 0 0 5px color-mix(in srgb, var(--step) 7%, transparent);
  font-size: 22px;
  transition:
    color 320ms ease,
    background 320ms ease;
}

.progress-header h2 {
  margin: 0;
  color: var(--muted);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.01em;
}

/* 一条分段进度条：每段 = 一个章节，当前段按章内进度填充 */
.progress-segments {
  display: flex;
  gap: 5px;
  margin: 16px 0 34px;
  padding: 0;
  list-style: none;
}

.progress-segments li {
  flex: 1;
  height: 6px;
  overflow: hidden;
  border-radius: 999px;
  background: #f0e6d9;
}

.progress-segments li span {
  display: block;
  width: 0;
  height: 100%;
  border-radius: inherit;
  background: var(--step);
  opacity: 0.42;
  transition:
    width 300ms ease,
    opacity 300ms ease,
    background 320ms ease;
}

.progress-segments li.is-current span {
  opacity: 1;
}

.form-step {
  display: none;
}

.form-step.is-active {
  display: block;
  animation: step-in 260ms ease both;
}

@keyframes step-in {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.question {
  min-width: 0;
  margin: 26px 0 0;
  padding: 0;
  border: 0;
}

.form-step > .question:first-child,
.form-step > .rating-list:first-child,
.form-step > div:first-child > .question:first-child,
.form-step > .text-question:first-child {
  margin-top: 0;
}

.question + .question {
  padding-top: 26px;
  border-top: 1px solid var(--line);
}

.question legend,
.question-label {
  width: 100%;
  margin-bottom: 22px;
  color: var(--ink);
  font-size: 26px;
  font-weight: 700;
  line-height: 1.45;
  letter-spacing: -0.015em;
}

.q-code {
  display: inline-grid;
  min-width: 34px;
  min-height: 26px;
  margin-right: 9px;
  place-items: center;
  border-radius: 999px;
  color: var(--step);
  background: var(--step-soft);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.03em;
}

.question-hint {
  display: block;
  margin: -12px 0 18px;
  color: var(--muted);
  font-size: 14px;
}

.choice-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.choice-grid.compact {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.choice-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(310px, 1fr));
  gap: 9px;
}

.choice {
  position: relative;
  display: flex;
  align-items: flex-start;
  gap: 11px;
  min-height: 48px;
  padding: 13px 15px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: #fff;
  cursor: pointer;
  transition:
    border-color 150ms ease,
    background 150ms ease;
}

.choice:hover {
  border-color: color-mix(in srgb, var(--step) 40%, #fff);
  background: #fffaf4;
}

.choice:has(input:checked) {
  border-color: var(--step);
  background: var(--step-soft);
  box-shadow: inset 3px 0 0 var(--step);
}

.choice input {
  flex: 0 0 auto;
  width: 18px;
  height: 18px;
  margin: 2px 0 0;
  accent-color: var(--step);
}

.choice-text {
  min-width: 0;
  font-size: 15px;
  line-height: 1.5;
}

.selection-count {
  float: right;
  margin-left: 12px;
  padding: 3px 10px;
  border-radius: 999px;
  color: var(--step);
  background: var(--step-soft);
  font-size: 12px;
  font-weight: 700;
}

/* 价格题：横向价格卡片 */
.choice-grid.compact.price-grid {
  grid-template-columns: repeat(auto-fit, minmax(104px, 1fr));
  gap: 8px;
}

.choice-grid.price-grid .choice {
  justify-content: center;
  padding: 16px 10px;
  text-align: center;
}

.choice-grid.price-grid .choice input {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
}

.choice-grid.price-grid .choice-text {
  font-size: 15px;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.choice-grid.price-grid .choice:has(input:checked) {
  color: #fff;
  background: var(--step);
  box-shadow: none;
}

.rating-list {
  display: grid;
  gap: 12px;
  margin-top: 0;
}

.rating-question {
  display: grid;
  grid-template-columns: 1fr minmax(210px, 250px);
  align-items: center;
  gap: 6px 20px;
  padding: 15px 18px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: #fff;
  transition: border-color 150ms ease;
}

.rating-question:has(input:checked) {
  border-color: color-mix(in srgb, var(--step) 32%, #fff);
  background: color-mix(in srgb, var(--step-soft) 45%, #fff);
}

.rating-question.is-invalid {
  border-color: var(--danger);
}

.rating-question legend {
  grid-column: 1;
  grid-row: 1 / span 2;
  float: left;
  margin: 0;
  padding: 0;
  font-size: 14px;
  line-height: 1.5;
}

.rating-options {
  grid-column: 2;
  grid-row: 1;
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  align-items: end;
  gap: 6px;
}

.rating-option {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-end;
  gap: 7px;
  min-height: 62px;
  padding: 9px 4px 8px;
  border: 1px solid var(--line);
  border-radius: 12px;
  color: var(--muted);
  background: #fffaf4;
  font-size: 12px;
  font-weight: 700;
  cursor: pointer;
  transition:
    border-color 150ms ease,
    background 150ms ease,
    color 150ms ease;
}

.rating-option input {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
}

.rating-bar {
  width: 52%;
  max-width: 17px;
  border-radius: 3px;
  background: #e7dccd;
  transition:
    background 180ms ease,
    height 180ms ease;
}

.rating-option:nth-child(1) .rating-bar { height: 6px; }
.rating-option:nth-child(2) .rating-bar { height: 11px; }
.rating-option:nth-child(3) .rating-bar { height: 16px; }
.rating-option:nth-child(4) .rating-bar { height: 21px; }
.rating-option:nth-child(5) .rating-bar { height: 26px; }

.rating-option:hover {
  border-color: color-mix(in srgb, var(--step) 40%, #fff);
}

/* 选中第 N 格时，前 N 格一起亮起来 */
.rating-options:has(> :nth-child(1) input:checked) > :nth-child(-n + 1),
.rating-options:has(> :nth-child(2) input:checked) > :nth-child(-n + 2),
.rating-options:has(> :nth-child(3) input:checked) > :nth-child(-n + 3),
.rating-options:has(> :nth-child(4) input:checked) > :nth-child(-n + 4),
.rating-options:has(> :nth-child(5) input:checked) > :nth-child(-n + 5) {
  color: var(--step);
  background: var(--step-soft);
}

.rating-options:has(> :nth-child(1) input:checked) > :nth-child(-n + 1) .rating-bar,
.rating-options:has(> :nth-child(2) input:checked) > :nth-child(-n + 2) .rating-bar,
.rating-options:has(> :nth-child(3) input:checked) > :nth-child(-n + 3) .rating-bar,
.rating-options:has(> :nth-child(4) input:checked) > :nth-child(-n + 4) .rating-bar,
.rating-options:has(> :nth-child(5) input:checked) > :nth-child(-n + 5) .rating-bar {
  background: var(--step);
}

.rating-option:has(input:checked) {
  border-color: var(--step);
}

.form-step > .rating-question {
  grid-template-columns: 1fr;
  padding: 0;
  border: 0;
  background: none;
}

.form-step > .rating-question legend {
  grid-column: 1;
  grid-row: 1;
  float: none;
  margin-bottom: 22px;
  font-size: 26px;
  font-weight: 700;
  line-height: 1.4;
  letter-spacing: -0.015em;
}

.form-step > .rating-question .rating-options {
  grid-column: 1;
  grid-row: 2;
  gap: 10px;
}

.form-step > .rating-question .rating-scale {
  grid-column: 1;
  grid-row: 3;
  font-size: 12px;
}

.form-step > .rating-question .rating-option {
  min-height: 96px;
  border-radius: 15px;
  font-size: 13px;
}

.form-step > .rating-question .rating-bar {
  max-width: 30px;
  border-radius: 4px;
}

.form-step > .rating-question .rating-option:nth-child(1) .rating-bar { height: 10px; }
.form-step > .rating-question .rating-option:nth-child(2) .rating-bar { height: 20px; }
.form-step > .rating-question .rating-option:nth-child(3) .rating-bar { height: 30px; }
.form-step > .rating-question .rating-option:nth-child(4) .rating-bar { height: 40px; }
.form-step > .rating-question .rating-option:nth-child(5) .rating-bar { height: 50px; }

.rating-scale {
  grid-column: 2;
  grid-row: 2;
  display: flex;
  justify-content: space-between;
  margin-top: 6px;
  color: var(--muted);
  font-size: 11px;
}

.field-error {
  display: none;
  margin: 8px 0 0;
  color: var(--danger);
  font-size: 12px;
  font-weight: 600;
}

.question.is-invalid > .field-error,
.other-answer.is-invalid > .field-error,
.consent-error.is-visible {
  display: block;
}

.text-question {
  display: grid;
}

.other-answer {
  gap: 8px;
  margin-top: 20px;
  font-size: 14px;
  font-weight: 600;
}

.text-question input,
.text-question textarea {
  width: 100%;
  padding: 14px 15px;
  border: 1px solid var(--line);
  border-radius: 14px;
  color: var(--ink);
  background: #fff;
}

.text-question textarea {
  min-height: 116px;
  resize: vertical;
  line-height: 1.6;
}

.text-question input:focus,
.text-question textarea:focus {
  border-color: var(--step);
}

.field-help {
  margin-top: 8px;
  color: var(--muted);
  font-size: 12px;
}

.skip-note {
  margin-top: 24px;
  padding: 16px 18px;
  border-left: 4px solid var(--honey);
  border-radius: 0 14px 14px 0;
  color: #7a5c30;
  background: #fdf3e2;
  font-size: 14px;
  line-height: 1.7;
}

.consent-row {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  margin-top: 24px;
  padding: 15px;
  border-radius: 16px;
  background: var(--sage-soft);
  color: #4d5d52;
  font-size: 13px;
  line-height: 1.6;
  cursor: pointer;
}

.consent-row input {
  width: 18px;
  height: 18px;
  margin: 1px 0 0;
  accent-color: var(--sage);
}

.form-message {
  margin-top: 24px;
  padding: 13px 15px;
  border: 1px solid rgba(179, 74, 60, 0.25);
  border-radius: 14px;
  color: var(--danger);
  background: rgba(179, 74, 60, 0.06);
  font-size: 13px;
  line-height: 1.5;
}

.form-actions {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  margin-top: 34px;
  padding-top: 26px;
  border-top: 1px solid var(--line);
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 48px;
  padding: 0 24px;
  border: 0;
  border-radius: 999px;
  font-weight: 700;
  cursor: pointer;
  transition:
    transform 150ms ease,
    opacity 150ms ease,
    background 150ms ease,
    box-shadow 150ms ease;
}

.button:hover:not(:disabled) {
  transform: translateY(-1px);
}

.button:disabled {
  cursor: not-allowed;
  opacity: 0.5;
}

.button .icon {
  width: 17px;
  height: 17px;
  stroke-width: 2.1;
}

.button.primary {
  margin-left: auto;
  color: #fff;
  background: var(--primary);
  box-shadow: 0 10px 22px rgba(194, 98, 47, 0.22);
}

.button.primary:hover:not(:disabled) {
  background: var(--primary-dark);
  box-shadow: 0 12px 26px rgba(194, 98, 47, 0.28);
}

.button.secondary {
  color: #7a5c44;
  background: #f5ebdf;
}

.button.secondary:hover:not(:disabled) {
  background: #efe1d0;
}

.success-state {
  padding: 44px 12px 22px;
  text-align: center;
}

.success-state:focus {
  outline: none;
}

.success-state .section-kicker {
  letter-spacing: 0.1em;
}

.success-icon {
  width: 64px;
  height: 64px;
  display: grid;
  margin: 0 auto 22px;
  place-items: center;
  border-radius: 50%;
  color: #fff;
  background: var(--sage);
  box-shadow: 0 12px 28px rgba(140, 167, 143, 0.3);
}

.success-icon .icon {
  width: 30px;
  height: 30px;
  stroke-width: 2.4;
}

.success-state h2 {
  margin: 0 0 12px;
  font-size: 24px;
  font-weight: 750;
  letter-spacing: -0.02em;
}

.success-icon.is-muted {
  background: var(--muted);
  box-shadow: none;
}

.success-state .state-note {
  max-width: 500px;
  margin: 0 auto;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.8;
}

.success-state p:last-child {
  max-width: 500px;
  margin: 0 auto;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.8;
}

footer {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  padding: 0 0 36px;
  color: var(--muted);
  font-size: 12px;
}

[hidden] {
  display: none !important;
}

@media (max-width: 720px) {
  .page-shell {
    width: min(100% - 24px, 620px);
  }

  .brand-bar {
    min-height: 64px;
  }

  .brand {
    font-size: 16px;
  }

  main {
    padding: 12px 0 56px;
  }

  .survey-card {
    padding: 26px 20px 30px;
    border-radius: 20px;
  }

  .survey-head h1 {
    font-size: 22px;
  }

  .question legend,
  .question-label,
  .form-step > .rating-question legend {
    font-size: 21px;
    margin-bottom: 18px;
  }

  .progress-header h2 {
    font-size: 14px;
  }

  .survey-note {
    font-size: 13.5px;
  }

  .step-icon {
    width: 38px;
    height: 38px;
    font-size: 19px;
  }

  .choice-grid,
  .choice-grid.compact {
    grid-template-columns: 1fr;
  }

  .rating-question {
    grid-template-columns: 1fr;
    padding: 14px 13px;
  }

  .rating-question legend {
    grid-column: 1;
    grid-row: 1;
    margin-bottom: 11px;
  }

  .rating-options {
    grid-column: 1;
    grid-row: 2;
    gap: 5px;
  }

  .rating-scale {
    grid-column: 1;
    grid-row: 3;
  }

  .choice-list {
    grid-template-columns: 1fr;
  }

  /* 价格档位标签短，手机上仍排 3 列，避免整屏被拉长 */
  .choice-grid.compact.price-grid {
    grid-template-columns: repeat(auto-fit, minmax(94px, 1fr));
  }

  .choice-grid.price-grid .choice {
    padding: 15px 6px;
  }

  .progress-segments {
    margin: 13px 0 24px;
  }

  .form-actions {
    position: sticky;
    bottom: 8px;
    z-index: 2;
    margin-inline: -8px;
    padding: 14px 8px 8px;
    border: 0;
    border-radius: 18px;
    background: rgba(255, 252, 247, 0.95);
    box-shadow: 0 -8px 22px rgba(120, 88, 60, 0.07);
    backdrop-filter: blur(10px);
  }

  .button {
    flex: 1;
    padding-inline: 14px;
  }

  footer {
    flex-direction: column;
    align-items: center;
    gap: 5px;
    text-align: center;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}