:root {
  color-scheme: light;
  --fg: #1a1a1a;
  --fg-muted: #5b5b5b;
  --fg-faint: #8a8a8a;
  --bg: #ffffff;
  --bg-soft: #fafafa;
  --border: #e5e5e5;
  --border-strong: #c8c8c8;
  --accent: #1f6feb;
  --accent-hover: #1a5cc4;
  --error: #c92a2a;
  --error-bg: #fff4f4;
  --radius: 8px;
  --maxw: 680px;
  --gap: 1.25rem;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font);
  font-size: 17px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

/* skip link for keyboard users */
.skip-link {
  position: absolute;
  left: -9999px;
}
.skip-link:focus {
  left: 1rem;
  top: 1rem;
  background: var(--fg);
  color: #fff;
  padding: 0.5rem 0.75rem;
  border-radius: var(--radius);
  z-index: 100;
}

.site-header {
  border-bottom: 1px solid var(--border);
  padding: 0.9rem 1.25rem;
  background: var(--bg);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  max-width: var(--maxw);
  margin: 0 auto;
}
.brand {
  display: flex;
  align-items: center;
  gap: 0.65rem;
}
.lang-toggle {
  display: inline-flex;
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 2px;
  background: var(--bg-soft);
}
.lang-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  border: 0;
  background: transparent;
  color: var(--fg-muted);
  font: inherit;
  font-size: 0.88rem;
  font-weight: 500;
  padding: 0.35rem 0.75rem;
  border-radius: 999px;
  cursor: pointer;
  line-height: 1;
}
.lang-btn .flag {
  font-size: 1.05rem;
  line-height: 1;
}
.lang-btn[aria-checked="true"] {
  background: var(--bg);
  color: var(--fg);
  box-shadow: 0 1px 2px rgba(0,0,0,0.06);
}
.lang-btn:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}
@media (max-width: 420px) {
  .lang-btn .lang-label { display: none; }
  .lang-btn { padding: 0.35rem 0.55rem; }
}
.brand-logo {
  width: 40px;
  height: 40px;
  object-fit: contain;
  border-radius: 4px;
}
.brand-name {
  font-weight: 600;
  letter-spacing: 0.01em;
}

.container {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 2rem 1.25rem 3rem;
}

.page-title {
  font-size: 1.55rem;
  font-weight: 600;
  line-height: 1.25;
  margin: 0 0 0.85rem;
  letter-spacing: -0.005em;
}

.lede {
  color: var(--fg-muted);
  margin: 0 0 1.75rem;
}

.section-header {
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--fg-faint);
  border-top: 1px solid var(--border);
  padding-top: 1.6rem;
  margin: 2.25rem 0 1.1rem;
}
/* first section header has no top divider */
form > .section-header:first-of-type {
  border-top: none;
  padding-top: 0;
  margin-top: 0;
}

.field {
  margin: 0 0 1.4rem;
  border: 0;
  padding: 0;
  min-width: 0;
}
fieldset.field { padding: 0; }

label,
.field > legend {
  display: block;
  font-weight: 500;
  margin-bottom: 0.45rem;
  line-height: 1.4;
}
.field > legend {
  padding: 0;
}

.q-num {
  font-weight: 600;
  margin-right: 0.2em;
}

.hint {
  color: var(--fg-muted);
  font-weight: 400;
  font-size: 0.95em;
}

input[type="text"],
input[type="email"],
input[type="number"],
textarea {
  width: 100%;
  font: inherit;
  color: var(--fg);
  background: var(--bg);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  padding: 0.7rem 0.85rem;
  -webkit-appearance: none;
  appearance: none;
}
textarea {
  resize: vertical;
  min-height: 6rem;
}
input:focus,
textarea:focus {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
  border-color: var(--accent);
}

/* radio / checkbox rows */
.option {
  display: flex;
  align-items: flex-start;
  gap: 0.6rem;
  padding: 0.55rem 0.7rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 0.45rem;
  cursor: pointer;
  font-weight: 400;
  background: var(--bg);
}
.option:has(input:checked) {
  border-color: var(--accent);
  background: #f4f8ff;
}
.option input[type="radio"],
.option input[type="checkbox"] {
  margin-top: 0.25rem;
  flex: 0 0 auto;
  accent-color: var(--accent);
  width: 1.05rem;
  height: 1.05rem;
}
.option > span { flex: 1; }

.option-other {
  flex-wrap: wrap;
}
.option-other .other-input {
  flex: 1 1 100%;
  margin-top: 0.5rem;
}
.option-other .other-input:disabled {
  background: #f3f3f3;
  color: var(--fg-faint);
  cursor: not-allowed;
}

/* sub-groups inside Q6 / Q7 */
.subgroup {
  margin-top: 1.1rem;
}
.sub-label {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--fg);
  margin: 0 0 0.5rem;
}

/* branching follow-up shown conditionally */
.branch {
  margin: 0.25rem 0 0.6rem 1.7rem;
  padding-left: 0.8rem;
  border-left: 2px solid var(--border);
  display: none;
}
.branch.is-visible {
  display: block;
}
.branch label {
  font-size: 0.95rem;
  color: var(--fg-muted);
  font-weight: 400;
  margin-top: 0.5rem;
}

/* disabled checkbox (max-2 enforcement) */
.option.is-disabled {
  opacity: 0.5;
  cursor: not-allowed;
}
.option.is-disabled input { cursor: not-allowed; }

/* errors */
.error {
  color: var(--error);
  font-size: 0.9rem;
  margin: 0.35rem 0 0;
}
.error-global {
  background: var(--error-bg);
  border: 1px solid #f3c2c2;
  padding: 0.65rem 0.85rem;
  border-radius: var(--radius);
  margin-top: 1rem;
}
.field.has-error input,
.field.has-error textarea,
.field.has-error .option {
  border-color: var(--error);
}
.field.has-error .option:has(input:checked) {
  background: var(--error-bg);
}

/* buttons */
.btn {
  font: inherit;
  border: 0;
  border-radius: var(--radius);
  padding: 0.85rem 1.4rem;
  cursor: pointer;
  font-weight: 600;
  letter-spacing: 0.01em;
}
.btn-primary {
  background: var(--fg);
  color: #fff;
}
.btn-primary:hover { background: #000; }
.btn-primary:disabled {
  background: var(--fg-muted);
  cursor: progress;
}

.submit-row {
  margin-top: 2rem;
}
.submit-hint {
  font-size: 0.88rem;
  color: var(--fg-faint);
  margin: 0.7rem 0 0;
}

/* footer */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 1.5rem 1.25rem 2rem;
  margin-top: 2rem;
}
.site-footer p {
  max-width: var(--maxw);
  margin: 0 auto;
  font-size: 0.82rem;
  color: var(--fg-faint);
  line-height: 1.5;
}

/* desktop tweaks */
@media (min-width: 720px) {
  .page-title { font-size: 1.85rem; }
  .container { padding-top: 2.75rem; }
}