:root {
  --color-page: #f7f7f4;
  --color-surface: #ffffff;
  --color-text: #202124;
  --color-muted: #5f6368;
  --color-border: #d8d9d2;
  --color-border-strong: #b8bbb1;
  --color-accent: #1f5f5b;
  --color-accent-dark: #164844;
  --color-accent-soft: #e6f0ee;
  --color-error: #9b2c2c;
  --color-focus: #174ea6;
  --shadow-subtle: 0 1px 2px rgba(32, 33, 36, 0.06);
  --radius-small: 4px;
  --radius-medium: 6px;
  --font-system: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  min-width: 320px;
  background: var(--color-page);
  color: var(--color-text);
  font-family: var(--font-system);
  font-size: 16px;
  line-height: 1.5;
}

body {
  margin: 0;
  background: var(--color-page);
}

button,
input {
  font: inherit;
}

button {
  cursor: pointer;
}

.skip-link {
  position: absolute;
  left: 1rem;
  top: 1rem;
  z-index: 10;
  transform: translateY(-160%);
  border: 2px solid var(--color-focus);
  border-radius: var(--radius-small);
  background: var(--color-surface);
  color: var(--color-focus);
  padding: 0.65rem 0.85rem;
  font-weight: 700;
}

.skip-link:focus {
  transform: translateY(0);
}

.container {
  width: min(100% - 2rem, 760px);
  margin-inline: auto;
}

.site-header {
  border-bottom: 1px solid var(--color-border);
  background: var(--color-surface);
  padding: 2rem 0 1.75rem;
}

.survey-kicker,
.section-label,
.question-id {
  color: var(--color-accent);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.survey-kicker {
  margin: 0 0 0.65rem;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  max-width: 740px;
  margin-bottom: 0;
  color: var(--color-text);
  font-size: clamp(1.55rem, 1.22rem + 1.2vw, 2.25rem);
  font-weight: 720;
  line-height: 1.18;
  letter-spacing: 0;
}

h2 {
  margin-bottom: 1rem;
  font-size: clamp(1.25rem, 1.1rem + 0.55vw, 1.55rem);
  line-height: 1.25;
}

h3 {
  margin-bottom: 0.6rem;
  font-size: 1rem;
  line-height: 1.35;
}

.survey-shell {
  padding: 1.25rem 0 3rem;
}

.intro-panel,
.survey-panel,
.message-panel {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-medium);
  background: var(--color-surface);
  box-shadow: var(--shadow-subtle);
}

.intro-panel {
  padding: clamp(1.1rem, 0.9rem + 1vw, 1.75rem);
}

.prose p {
  margin-bottom: 0.9rem;
  color: var(--color-text);
}

.prose p:last-child {
  margin-bottom: 0;
}

.participant-info {
  display: grid;
  gap: 0.65rem;
  margin-top: 1.25rem;
  border-top: 1px solid var(--color-border);
  padding-top: 1.25rem;
}

.participant-info h3 {
  margin: 0.35rem 0 0;
}

.participant-info p {
  margin-bottom: 0;
}

.consent-control {
  display: flex;
  align-items: flex-start;
  gap: 0.65rem;
  margin-top: 1.25rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-small);
  background: #f9faf7;
  padding: 0.85rem;
  font-weight: 650;
}

.consent-control input {
  width: 1.15rem;
  height: 1.15rem;
  margin: 0.15rem 0 0;
  accent-color: var(--color-accent);
  flex: 0 0 auto;
}

.consent-control span {
  min-width: 0;
}

.survey-panel {
  margin-top: 1rem;
  padding: clamp(1rem, 0.82rem + 0.9vw, 1.5rem);
}

.progress-block {
  margin-bottom: 1.5rem;
}

.progress-meta {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 0.45rem;
  color: var(--color-muted);
  font-size: 0.9rem;
}

.progress-track {
  overflow: hidden;
  height: 0.45rem;
  border-radius: 999px;
  background: #ecede8;
}

.progress-fill {
  display: block;
  height: 100%;
  border-radius: inherit;
  background: var(--color-accent);
}

.section-heading {
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 1rem;
  margin-bottom: 1.25rem;
}

.section-label {
  display: block;
  margin-bottom: 0.25rem;
}

.section-heading h2 {
  margin-bottom: 0;
}

.survey-form {
  display: grid;
  gap: 1rem;
}

.question-block {
  min-width: 0;
  margin: 0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-medium);
  padding: 1rem;
}

.question-block.question-error {
  border-color: rgba(155, 44, 44, 0.65);
}

.question-block legend {
  display: grid;
  gap: 0.35rem;
  width: 100%;
  padding: 0;
  margin-bottom: 0.85rem;
  color: var(--color-text);
}

.question-text {
  display: block;
  max-width: 100%;
  font-weight: 650;
  line-height: 1.45;
}

.field-instruction {
  margin-bottom: 0.75rem;
  color: var(--color-muted);
  font-size: 0.95rem;
}

.required-note {
  margin: -0.35rem 0 1rem;
  color: var(--color-muted);
  font-size: 0.95rem;
}

.choice-list {
  display: grid;
  gap: 0.65rem;
}

.choice-control {
  display: flex;
  align-items: flex-start;
  gap: 0.65rem;
  min-height: 2.75rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-small);
  background: #fff;
  padding: 0.72rem 0.8rem;
}

.choice-control:hover {
  border-color: var(--color-border-strong);
}

.choice-control input {
  width: 1.15rem;
  height: 1.15rem;
  margin: 0.1rem 0 0;
  accent-color: var(--color-accent);
  flex: 0 0 auto;
}

.choice-control span {
  min-width: 0;
  overflow-wrap: anywhere;
}

.choice-control:has(input:checked) {
  border-color: var(--color-accent);
  background: var(--color-accent-soft);
}

.choice-control:has(input:focus-visible),
.likert-option:has(input:focus-visible),
.button:focus-visible,
.skip-link:focus-visible {
  outline: 3px solid var(--color-focus);
  outline-offset: 3px;
}

.instruction-box {
  border-left: 4px solid var(--color-accent);
  border-radius: var(--radius-small);
  background: #f9faf7;
  padding: 1rem;
}

.instruction-box p {
  margin-bottom: 0.75rem;
}

.instruction-box p:last-child {
  margin-bottom: 0;
}

.likert-question {
  padding-bottom: 1.1rem;
}

.likert-scale {
  display: grid;
  gap: 0.45rem;
}

.likert-anchors {
  display: flex;
  justify-content: space-between;
  gap: 0.75rem;
  color: var(--color-muted);
  font-size: 0.88rem;
  line-height: 1.3;
}

.likert-anchors span:last-child {
  text-align: right;
}

.likert-options {
  display: grid;
  grid-template-columns: repeat(7, minmax(0, 1fr));
  gap: 0.35rem;
}

.likert-option {
  min-width: 0;
}

.likert-option input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.likert-option span {
  display: grid;
  place-items: center;
  min-height: 2.75rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-small);
  background: var(--color-surface);
  color: var(--color-text);
  font-size: 1.08rem;
  font-weight: 700;
  line-height: 1;
  user-select: none;
}

.likert-option:hover span {
  border-color: var(--color-border-strong);
}

.likert-option input:checked + span {
  border-color: var(--color-accent);
  background: var(--color-accent);
  color: #ffffff;
}

.validation-message {
  margin: 0;
  border: 1px solid rgba(155, 44, 44, 0.35);
  border-radius: var(--radius-small);
  background: #fff7f7;
  color: var(--color-error);
  padding: 0.75rem 0.85rem;
  font-weight: 650;
}

.field-error {
  margin-top: 0.75rem;
}

.vendor-reminder {
  margin: -0.25rem 0 1rem;
  border-left: 4px solid var(--color-border-strong);
  border-radius: var(--radius-small);
  background: #fafaf8;
  color: var(--color-muted);
  padding: 0.75rem 0.85rem;
}

.scale-guide {
  display: grid;
  gap: 0.35rem;
  margin-top: 0.9rem;
  border-top: 1px solid var(--color-border);
  padding-top: 0.9rem;
  color: var(--color-muted);
}

.scale-guide strong {
  display: inline-block;
  min-width: 1.4rem;
  color: var(--color-text);
}

.review-intro {
  color: var(--color-muted);
}

.review-list {
  display: grid;
  gap: 0.75rem;
  margin: 1rem 0;
}

.review-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-small);
  padding: 0.85rem;
}

.review-item h3 {
  margin-bottom: 0.2rem;
}

.review-item p {
  margin-bottom: 0;
  color: var(--color-muted);
}

.form-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 0.65rem;
  border-top: 1px solid var(--color-border);
  padding-top: 1rem;
}

.button {
  min-height: 2.75rem;
  border: 1px solid transparent;
  border-radius: var(--radius-small);
  padding: 0.7rem 1rem;
  font-weight: 700;
  line-height: 1.1;
}

.button-primary {
  border-color: var(--color-accent);
  background: var(--color-accent);
  color: #ffffff;
}

.button-primary:hover {
  border-color: var(--color-accent-dark);
  background: var(--color-accent-dark);
}

.button:disabled {
  cursor: not-allowed;
  opacity: 0.72;
}

.button-secondary {
  border-color: var(--color-border-strong);
  background: var(--color-surface);
  color: var(--color-text);
}

.button-secondary:hover {
  border-color: var(--color-accent);
}

.message-panel {
  margin-top: 1rem;
  padding: clamp(1.1rem, 0.9rem + 1vw, 1.75rem);
}

.message-panel p:last-child {
  margin-bottom: 0;
}

.hp-field {
  position: absolute;
  left: -10000px;
  top: auto;
  overflow: hidden;
  width: 1px;
  height: 1px;
}

.site-footer {
  border-top: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-muted);
  padding: 1rem 0;
  font-size: 0.88rem;
}

.site-footer p {
  margin-bottom: 0;
}

[hidden] {
  display: none !important;
}

@media (max-width: 430px) {
  .container {
    width: min(100% - 0.75rem, 760px);
  }

  .site-header {
    padding: 1.5rem 0 1.25rem;
  }

  .survey-shell {
    padding-top: 0.75rem;
  }

  .survey-panel {
    padding: 0.7rem;
  }

  .intro-panel,
  .survey-panel,
  .message-panel {
    border-radius: var(--radius-small);
  }

  .question-block {
    padding: 0.65rem;
  }

  .progress-meta,
  .likert-anchors {
    font-size: 0.82rem;
  }

  .likert-options {
    gap: 0.125rem;
    margin-inline: -0.2rem;
  }

  .likert-option span {
    min-height: 2.75rem;
    font-size: 1rem;
  }

  .form-actions {
    display: grid;
    grid-template-columns: 1fr;
  }

  .button {
    width: 100%;
  }

  .review-item {
    align-items: stretch;
    flex-direction: column;
  }
}

@media (max-width: 360px) {
  .container {
    width: min(100% - 0.5rem, 760px);
  }

  .survey-panel {
    padding: 0.5rem;
  }

  .question-block {
    padding: 0.5rem;
  }

  .likert-anchors {
    gap: 0.5rem;
  }

  .likert-options {
    gap: 0.0625rem;
    margin-inline: -0.25rem;
  }

  .likert-option span {
    min-height: 2.75rem;
  }
}

@media (min-width: 768px) {
  .site-header {
    padding-top: 2.4rem;
    padding-bottom: 2rem;
  }

  .survey-shell {
    padding-top: 1.5rem;
  }

  .question-block {
    padding: 1.15rem 1.25rem;
  }

  .likert-options {
    gap: 0.5rem;
  }
}