:root {
  --bg: #f4f5fb;
  --bg-accent: radial-gradient(1200px 500px at 50% -120px, #e3e5ff 0%, rgba(227, 229, 255, 0) 70%);
  --surface: #ffffff;
  --surface-2: #f7f8fc;
  --border: #e3e5ee;
  --border-strong: #c9cdda;
  --text: #151826;
  --text-2: #4a5068;
  --text-3: #7a8098;
  --accent: #4f46e5;
  --accent-hover: #4338ca;
  --accent-soft: #eef0ff;
  --accent-ring: rgba(79, 70, 229, 0.22);
  --on-accent: #ffffff;
  --danger: #c62828;
  --danger-soft: #fdecec;
  --success: #15803d;
  --success-soft: #e7f6ec;
  --chip-bg: #f6f7fb;
  --chip-border: #dfe2ec;
  --chip-hover: #eef0f7;
  --shadow: 0 1px 2px rgba(20, 24, 40, 0.04), 0 8px 32px rgba(20, 24, 40, 0.06);
  --radius: 16px;
  color-scheme: light;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg-accent), var(--bg);
  background-repeat: no-repeat;
  color: var(--text);
  font: 16px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}
[hidden] { display: none !important; }

.page { max-width: 860px; margin: 0 auto; padding: 48px 16px 64px; }

.hero { text-align: center; margin: 0 auto 32px; max-width: 640px; }
.eyebrow {
  display: inline-block; font-size: 12px; font-weight: 600; letter-spacing: .08em; text-transform: uppercase;
  color: var(--accent); background: var(--accent-soft); padding: 6px 12px; border-radius: 999px;
}
.hero h1 { font-size: clamp(26px, 4.5vw, 38px); line-height: 1.15; letter-spacing: -0.02em; margin: 16px 0 12px; }
.hero p { color: var(--text-2); margin: 0; font-size: 17px; }

.card {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  box-shadow: var(--shadow);
}

form.card { padding: 8px 32px 28px; }
.step { padding: 28px 0; border-bottom: 1px solid var(--border); }
.step:last-of-type { border-bottom: 0; }
.step-head { display: flex; align-items: flex-start; gap: 14px; margin-bottom: 20px; }
.step-head > div { flex: 1; min-width: 0; }
.step-num {
  flex: none; width: 32px; height: 32px; border-radius: 10px; display: grid; place-items: center;
  font-weight: 700; font-size: 15px; color: var(--accent); background: var(--accent-soft);
}
.step h2 { font-size: 19px; margin: 3px 0 2px; letter-spacing: -0.01em; }
.step-sub { margin: 0; color: var(--text-3); font-size: 14px; }

.grid { display: grid; grid-template-columns: 1fr 1fr; gap: 18px 20px; }
.span-2 { grid-column: 1 / -1; }
.field label { display: block; font-weight: 600; font-size: 14px; margin-bottom: 6px; color: var(--text); }
.req { color: var(--danger); }

input[type="text"], input[type="email"], input[type="tel"], select {
  width: 100%; height: 46px; padding: 0 14px; font: inherit; font-size: 15px; color: var(--text);
  background: var(--surface-2); border: 1px solid var(--border-strong); border-radius: 10px;
  transition: border-color .15s, box-shadow .15s, background .15s;
}
input::placeholder { color: var(--text-3); }
input:hover, select:hover:not(:disabled) { border-color: var(--text-3); }
input:focus, select:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 4px var(--accent-ring); background: var(--surface); }
select { appearance: none; -webkit-appearance: none; padding-right: 40px; cursor: pointer; }
select:disabled { opacity: .55; cursor: not-allowed; }
.select-wrap { position: relative; }
.select-wrap::after {
  content: ""; position: absolute; right: 16px; top: 50%; width: 8px; height: 8px; margin-top: -6px;
  border-right: 2px solid var(--text-3); border-bottom: 2px solid var(--text-3); transform: rotate(45deg); pointer-events: none;
}
.field.invalid input, .field.invalid select { border-color: var(--danger); }
.field.invalid input:focus, .field.invalid select:focus { box-shadow: 0 0 0 4px rgba(198, 40, 40, .18); }
.field-error { color: var(--danger); font-size: 13px; margin: 6px 0 0; min-height: 0; }
.field-error:empty { display: none; }

/* ---------- Pain area chips ---------- */
.count-pill {
  flex: none; align-self: center; font-size: 13px; color: var(--text-2); background: var(--surface-2);
  border: 1px solid var(--border); padding: 6px 12px; border-radius: 999px; white-space: nowrap;
  transition: background .2s, color .2s, border-color .2s;
}
.count-pill strong { font-variant-numeric: tabular-nums; }
.count-pill.has { background: var(--accent); border-color: var(--accent); color: var(--on-accent); }

.pain-groups { display: grid; gap: 26px; }
.pain-group-head { display: flex; align-items: baseline; justify-content: space-between; gap: 12px; margin-bottom: 4px; }
.pain-group h3 { font-size: 15px; margin: 0; letter-spacing: -0.005em; }
.pain-group .group-count { font-size: 12px; color: var(--accent); font-weight: 600; white-space: nowrap; }
.pain-group .group-count:empty { display: none; }
.pain-group .group-desc { margin: 0 0 12px; font-size: 13px; color: var(--text-3); }

.chips { display: flex; flex-wrap: wrap; gap: 10px; }
.chip {
  display: inline-flex; align-items: center; gap: 8px; max-width: 100%;
  min-height: 40px; padding: 8px 16px; border-radius: 999px;
  font: inherit; font-size: 14px; line-height: 1.3; text-align: left; color: var(--text-2);
  background: var(--chip-bg); border: 1.5px solid var(--chip-border); cursor: pointer;
  transition: background .15s, border-color .15s, color .15s, box-shadow .15s, transform .08s;
  -webkit-tap-highlight-color: transparent;
}
.chip:hover { background: var(--chip-hover); border-color: var(--border-strong); color: var(--text); }
.chip:active { transform: scale(.97); }
.chip:focus-visible { outline: none; box-shadow: 0 0 0 4px var(--accent-ring); }
.chip .check {
  flex: none; width: 18px; height: 18px; border-radius: 50%; display: grid; place-items: center;
  border: 1.5px solid var(--border-strong); background: var(--surface); transition: all .15s;
}
.chip .check svg { width: 12px; height: 12px; opacity: 0; transform: scale(.5); transition: all .15s; }
.chip[aria-pressed="true"] {
  /* No font-weight change: it would widen the chip and reflow the row under the cursor. */
  background: var(--accent-soft); border-color: var(--accent); color: var(--text);
  box-shadow: inset 0 0 0 0.5px var(--accent);
}
.chip[aria-pressed="true"] .check { background: var(--accent); border-color: var(--accent); color: var(--on-accent); }
.chip[aria-pressed="true"] .check svg { opacity: 1; transform: scale(1); }
.pain-groups.invalid .chip:not([aria-pressed="true"]) { border-color: rgba(198, 40, 40, .35); }

/* ---------- Footer / submit ---------- */
.form-footer {
  display: flex; align-items: center; justify-content: space-between; gap: 16px; flex-wrap: wrap;
  padding-top: 24px; border-top: 1px solid var(--border);
}
.footer-note { margin: 0; font-size: 14px; color: var(--text-3); }
.btn-primary, .btn-secondary {
  position: relative; display: inline-flex; align-items: center; justify-content: center; gap: 10px;
  height: 50px; padding: 0 28px; border-radius: 12px; font: inherit; font-weight: 600; font-size: 16px; cursor: pointer;
  transition: background .15s, box-shadow .15s, opacity .15s, transform .08s;
}
.btn-primary { color: var(--on-accent); background: var(--accent); border: 0; box-shadow: 0 6px 16px var(--accent-ring); }
.btn-primary:hover { background: var(--accent-hover); }
.btn-primary:active { transform: translateY(1px); }
.btn-primary:focus-visible, .btn-secondary:focus-visible { outline: none; box-shadow: 0 0 0 4px var(--accent-ring); }
.btn-primary:disabled { cursor: progress; opacity: .75; }
.btn-secondary { color: var(--text); background: var(--surface-2); border: 1px solid var(--border-strong); }
.btn-secondary:hover { border-color: var(--text-3); }

.spinner {
  display: none; width: 18px; height: 18px; border-radius: 50%;
  border: 2.5px solid currentColor; border-right-color: transparent; animation: spin .7s linear infinite;
}
.is-busy .spinner { display: inline-block; }
@keyframes spin { to { transform: rotate(360deg); } }

.alert { border-radius: 12px; padding: 14px 16px; font-size: 14px; margin-top: 16px; }
.alert-error { background: var(--danger-soft); color: var(--danger); border: 1px solid rgba(198, 40, 40, .25); }

.success { text-align: center; padding: 48px 32px; outline: none; }
.success-icon {
  width: 64px; height: 64px; border-radius: 50%; margin: 0 auto 16px; display: grid; place-items: center;
  color: var(--success); background: var(--success-soft);
}
.success h2 { margin: 0 0 8px; font-size: 24px; letter-spacing: -0.01em; }
.success p { margin: 0 auto 24px; color: var(--text-2); max-width: 460px; }

.loading { text-align: center; color: var(--text-3); }

.hp { position: absolute !important; left: -10000px; width: 1px; height: 1px; overflow: hidden; }

@media (max-width: 640px) {
  .page { padding-top: 28px; }
  form.card { padding: 0 18px 20px; }
  .grid { grid-template-columns: 1fr; }
  .step { padding: 22px 0; }
  .step-head { flex-wrap: wrap; }
  .count-pill { order: 3; margin-left: 46px; }
  .chip { font-size: 13.5px; padding: 8px 14px; }
  .form-footer { flex-direction: column-reverse; align-items: stretch; text-align: center; }
  .btn-primary { width: 100%; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition: none !important; animation-duration: .01ms !important; }
}