:root {
  --color-required: #ff4d4f;
  --color-input-border: #d9d9d9;
  --color-survey-bg-mid: #ede8ff;
  --color-error-bg: #fff2f0;
  --color-error-border: #ffccc7;
}

body.page-survey .page-bg {
  background: url("../static/bg.jpg") center / cover no-repeat;
}

.survey-page {
  min-height: 100vh;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding: 28px var(--page-edge-gutter) 40px var(--page-edge-gutter);
}

.card--survey {
  max-width: 780px;
}

.card--survey .card__body {
  padding-top: 22px;
}

.survey-load-error {
  margin-bottom: 16px;
  padding: 12px 14px;
  font-size: 0.9rem;
  color: var(--color-text);
  background: var(--color-error-bg);
  border: 1px solid var(--color-error-border);
  border-radius: var(--radius-btn);
}

.answered-readonly-tip {
  margin: 0 0 18px;
  padding: 12px 14px;
  font-size: 0.9rem;
  line-height: 1.45;
  color: var(--color-text);
  background: #f0eff8;
  border: 1px solid #d4cfe8;
  border-radius: var(--radius-btn);
}

.answered-option-summary {
  margin: 10px 0 0;
  padding: 8px 10px;
  font-size: 0.88rem;
  line-height: 1.45;
  color: #3d3d5c;
  background: #faf9ff;
  border: 1px solid #e8e4f5;
  border-radius: 6px;
}

.survey-fields {
  margin-bottom: 8px;
}

.form-field {
  margin-bottom: 22px;
}

.form-field--error .input-wrap,
.form-field--error .radio-group {
  border-color: var(--color-required);
}

.field-label {
  margin-bottom: 8px;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--color-text);
}

.field-label .req {
  color: var(--color-required);
  font-weight: 700;
  margin-right: 2px;
}

.field-label label {
  font-weight: 600;
  cursor: pointer;
}

.input-wrap {
  display: flex;
  align-items: center;
  border: 1px solid var(--color-input-border);
  border-radius: 8px;
  background: #fff;
  overflow: hidden;
  transition: border-color 0.2s ease, background-color 0.15s ease;
}

body.page-survey .input-wrap:hover {
  background: #f9f9f9;
}

.input-wrap:focus-within {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 2px rgba(24, 144, 255, 0.12);
}

.input-wrap--with-icon .input-wrap__icon {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0 10px 0 12px;
  color: var(--color-text-muted);
}

.input-wrap__icon-svg {
  display: block;
}

.input-wrap input[type="text"] {
  flex: 1;
  min-width: 0;
  border: none;
  outline: none;
  padding: 12px 14px 12px;
  font-size: 1rem;
  font-family: inherit;
  background: transparent;
}

.input-wrap--with-icon input[type="text"] {
  padding-left: 0;
}

.radio-group {
  border: 1px solid transparent;
  border-radius: 8px;
  padding: 4px 0;
}

.radio-group--vertical .radio-row {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  padding: 8px 0;
  border-bottom: 1px solid #f0f0f0;
  transition: background-color 0.15s ease;
  cursor: pointer;
}

body.page-survey .radio-group--vertical .radio-row:hover {
  background: #f9f9f9;
}

.radio-group--vertical .radio-row:last-child {
  border-bottom: none;
}

.radio-group--vertical input {
  margin-top: 4px;
}

.radio-group--inline-wrap {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 20px;
}

.radio-group--inline-wrap .radio-row {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  border-radius: 6px;
  transition: background-color 0.15s ease;
}

body.page-survey .radio-group--inline-wrap .radio-row:hover {
  background: #f9f9f9;
}

.radio-row input[type="radio"] {
  width: 16px;
  height: 16px;
  accent-color: var(--color-primary);
  cursor: pointer;
}

.radio-row label,
.radio-row__label {
  cursor: pointer;
  font-size: 0.95rem;
  color: var(--color-text);
  line-height: 1.5;
  flex: 1;
  min-width: 0;
}

.radio-row__label--stack {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 8px;
}

.radio-group--inline-wrap .radio-row__label--stack {
  flex-direction: row;
  flex-wrap: wrap;
  align-items: center;
}

.radio-row__key {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--color-text);
}

.radio-row__caption {
  font-size: 0.95rem;
  color: var(--color-text);
  line-height: 1.5;
  max-width: 100%;
}

.radio-row__opt-img-wrap {
  width: min(200px, 100%);
  max-height: 200px;
  overflow: hidden;
  border-radius: 6px;
  border: 1px solid var(--color-input-border);
  background: #fafafa;
  line-height: 0;
}

.radio-row__opt-img-wrap .radio-row__opt-img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.radio-row__opt-img-wrap--inline {
  width: 56px;
  max-width: 56px;
  max-height: 40px;
}

.radio-row__opt-img-wrap--inline .radio-row__opt-img {
  max-height: 40px;
  object-fit: cover;
}

.radio-row--has-image.radio-group--vertical .radio-row__label--stack {
  align-self: stretch;
}

.field-error {
  margin: 6px 0 0;
  font-size: 0.8125rem;
  color: var(--color-required);
}

.form-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: space-between;
  margin-top: 8px;
  padding-top: 8px;
}

.form-actions .btn {
  flex: 1 1 140px;
}

.form-actions .btn--primary {
  width: auto;
}

.survey-root {
  width: 100%;
}

.form-actions--submit-only {
  justify-content: center;
  margin-top: 4px;
}

.form-actions--submit-only .btn--primary {
  flex: 1 1 280px;
  max-width: 360px;
  width: min(100%, 360px);
}

.status-toast {
  margin-top: 16px;
  padding: 10px 12px;
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  background: #f6ffed;
  border: 1px solid #b7eb8f;
  border-radius: var(--radius-btn);
  display: none;
}

.status-toast.is-visible {
  display: block;
}

.status-toast.status-toast--error {
  background: var(--color-error-bg);
  border-color: var(--color-error-border);
  color: var(--color-text);
}

/* -------------------------------------------------------------------------- */
/* 移动端答题区（≤767px） */
/* -------------------------------------------------------------------------- */

@media (max-width: 767px) {
  .survey-page {
    align-items: stretch;
    padding: 0;
  }

  #view-survey .card__banner {
    display: none;
  }

  #view-survey .card {
    max-width: none;
    border-radius: 0;
    box-shadow: none;
  }

  #view-survey .card__body {
    padding: 20px 20px 24px;
  }

  .form-field {
    margin-bottom: 20px;
  }

  .field-label {
    text-align: left;
    margin-bottom: 10px;
  }

  .input-wrap {
    border-color: #d0d0d0;
    border-radius: 6px;
  }

  .input-wrap input[type="text"] {
    min-height: 48px;
    padding-top: 14px;
    padding-bottom: 14px;
  }

  /* 班级：2×2 宫格 + 分隔线 */
  .form-field[data-field-id="profile_class"] .radio-group--inline-wrap {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0;
    border: 1px solid #d0d0d0;
    border-radius: 8px;
    overflow: hidden;
    padding: 0;
    background: #fff;
  }

  .form-field[data-field-id="profile_class"] .radio-group--inline-wrap .radio-row {
    display: flex;
    align-items: center;
    gap: 8px;
    margin: 0;
    padding: 14px 14px;
    min-height: 48px;
    border-right: 1px solid #e8e8e8;
    border-bottom: 1px solid #e8e8e8;
  }

  .form-field[data-field-id="profile_class"] .radio-group--inline-wrap .radio-row:nth-child(2n) {
    border-right: none;
  }

  .form-field[data-field-id="profile_class"] .radio-group--inline-wrap .radio-row:nth-child(3),
  .form-field[data-field-id="profile_class"] .radio-group--inline-wrap .radio-row:nth-child(4) {
    border-bottom: none;
  }

  /* 题目单选：外框 + 行间分隔 */
  .radio-group--vertical {
    border: 1px solid #d0d0d0;
    border-radius: 8px;
    padding: 0 4px 0 12px;
    background: #fff;
  }

  .radio-group--vertical .radio-row {
    padding: 14px 8px 14px 0;
    min-height: 48px;
    border-bottom-color: #e8e8e8;
  }

  .radio-group--vertical .radio-row:last-child {
    border-bottom: none;
  }

  .radio-row input[type="radio"] {
    width: 18px;
    height: 18px;
    flex-shrink: 0;
  }

  .form-actions--submit-only {
    padding-top: 12px;
  }

  .form-actions--submit-only .btn--primary {
    width: 100%;
    max-width: none;
    min-height: 48px;
  }
}