:root {
  color-scheme: light;
  --bg: #eef4f2;
  --surface: #ffffff;
  --surface-muted: #f5f8f7;
  --ink: #173139;
  --muted: #587078;
  --line: #ccdad7;
  --accent: #176b67;
  --accent-dark: #0d4c49;
  --accent-soft: #dcefeb;
  --warning: #805114;
  --warning-soft: #fff4df;
  --danger: #8b3232;
  --danger-soft: #faeaea;
  --shadow: 0 18px 50px rgba(28, 58, 63, 0.09);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.5;
  color: var(--ink);
  background: var(--bg);
}

* { box-sizing: border-box; }
body { margin: 0; min-width: 320px; background: radial-gradient(circle at 50% 0%, #f8fbfa 0, var(--bg) 45rem); }
button, input, select, textarea { font: inherit; }
button, select, input[type="range"] { cursor: pointer; }
button:focus-visible, input:focus-visible, select:focus-visible, textarea:focus-visible, summary:focus-visible { outline: 3px solid #f3b849; outline-offset: 3px; }
h1[tabindex="-1"]:focus { outline: none; }
h1, h2, p { margin-top: 0; }
h1 { max-width: 18ch; margin-bottom: 0.8rem; font-size: clamp(1.8rem, 4vw, 2.6rem); line-height: 1.12; letter-spacing: -0.025em; }
h2 { font-size: 1rem; }
ul { margin: 0; padding-left: 1.2rem; }
li + li { margin-top: 0.35rem; }

.app-shell { width: min(100% - 2rem, 860px); margin: 0 auto; padding: 1.25rem 0 3rem; }
.topbar, .screen-card, .footer { min-width: 0; }
.topbar { display: flex; justify-content: space-between; align-items: center; gap: 1rem; margin-bottom: 1.25rem; }
.topbar__actions { display: flex; flex-wrap: wrap; justify-content: flex-end; gap: 0.5rem; }
.wordmark { font-weight: 800; letter-spacing: -0.02em; }
.prototype-label { display: flex; align-items: center; gap: 0.35rem; color: var(--muted); font-size: 0.78rem; }
.prototype-label span { width: 0.5rem; height: 0.5rem; border-radius: 50%; background: var(--accent); }
.screen-card { overflow-wrap: anywhere; padding: clamp(1.2rem, 4vw, 2.4rem); border: 1px solid rgba(23, 107, 103, 0.14); border-radius: 1.25rem; background: var(--surface); box-shadow: var(--shadow); }
.eyebrow { margin-bottom: 0.6rem; color: var(--accent-dark); font-size: 0.78rem; font-weight: 800; letter-spacing: 0.08em; text-transform: uppercase; }
.lead { max-width: 65ch; margin-bottom: 1.5rem; color: var(--muted); font-size: 1.04rem; }
.hint, .optional { color: var(--muted); font-size: 0.83rem; }
.field, legend { display: block; margin: 1.2rem 0 0.45rem; font-weight: 750; }
fieldset { margin: 1.4rem 0 0; padding: 0; border: 0; }
select, textarea { width: 100%; border: 1px solid #9fb3af; border-radius: 0.75rem; background: #fff; color: var(--ink); padding: 0.8rem 0.9rem; }
textarea { resize: vertical; }
input[type="range"] { width: 100%; accent-color: var(--accent); }

.progress { display: grid; grid-template-columns: repeat(3, 1fr); gap: 0.5rem; margin: 0 0 0.85rem; padding: 0; list-style: none; }
.progress__item { display: flex; align-items: center; justify-content: center; gap: 0.45rem; padding: 0.55rem; color: var(--muted); font-size: 0.82rem; font-weight: 700; }
.progress__dot { display: grid; width: 1.55rem; height: 1.55rem; place-items: center; border: 1px solid var(--line); border-radius: 50%; background: var(--surface); }
.progress__item--current { color: var(--accent-dark); }
.progress__item--current .progress__dot { border-color: var(--accent); background: var(--accent); color: #fff; }
.progress__item--done .progress__dot { border-color: var(--accent); background: var(--accent-soft); color: var(--accent-dark); }
.route-badge { width: fit-content; margin: 0 0 0.85rem; padding: 0.4rem 0.75rem; border-radius: 999px; background: var(--warning-soft); color: var(--warning); font-size: 0.8rem; font-weight: 800; }

.boundary-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 0.75rem; }
.boundary-card { padding: 1rem; border: 1px solid #a9cdc5; border-radius: 0.9rem; background: #eff9f7; }
.boundary-card--muted { border-color: var(--line); background: var(--surface-muted); }
.privacy-note, .goodbye-note { margin-top: 1.2rem; padding: 0.85rem 1rem; border-left: 4px solid var(--accent); background: var(--surface-muted); font-size: 0.9rem; }
.radio-card, .check-row { display: flex; align-items: flex-start; gap: 0.65rem; margin-top: 0.55rem; padding: 0.8rem; border: 1px solid var(--line); border-radius: 0.75rem; background: var(--surface); }
.radio-card:has(input:checked) { border-color: var(--accent); background: var(--accent-soft); }
.radio-card input, .check-row input { margin-top: 0.25rem; accent-color: var(--accent); }

.choice-list { display: grid; gap: 0.7rem; }
.choice-list--compact { grid-template-columns: repeat(3, 1fr); }
.choice-card { display: flex; flex-direction: column; gap: 0.25rem; width: 100%; padding: 1rem; text-align: left; border: 1px solid var(--line); border-radius: 0.85rem; background: var(--surface); color: var(--ink); }
.choice-card:hover { border-color: var(--accent); }
.choice-card--selected { border-color: var(--accent); background: var(--accent-soft); box-shadow: inset 4px 0 0 var(--accent); }
.choice-card__title { font-weight: 800; }

.button { min-height: 2.65rem; padding: 0.62rem 0.9rem; border: 1px solid transparent; border-radius: 0.7rem; font-weight: 750; }
.button:disabled { cursor: not-allowed; opacity: 0.45; }
.button--primary { background: var(--accent); color: #fff; }
.button--primary:hover { background: var(--accent-dark); }
.button--secondary { border-color: var(--accent); background: var(--accent-soft); color: var(--accent-dark); }
.button--quiet { border-color: var(--line); background: var(--surface); color: var(--ink); }
.button--danger-quiet { border-color: #e2b5b5; background: var(--danger-soft); color: var(--danger); }
.actions { display: flex; gap: 0.65rem; margin-top: 1.5rem; }
.actions--end { justify-content: flex-end; }
.actions--split { justify-content: space-between; }
.actions--wrap { flex-wrap: wrap; }

.range-row { display: flex; justify-content: space-between; align-items: end; }
.range-row output { color: var(--accent-dark); font-weight: 800; }
.chat { display: grid; gap: 0.65rem; margin-bottom: 1rem; }
.turn { max-width: 82%; padding: 0.85rem 1rem; border-radius: 0.9rem; }
.turn--system { background: var(--surface-muted); }
.turn--user { justify-self: end; background: var(--accent-soft); }
.turn__label { display: block; margin-bottom: 0.25rem; color: var(--muted); font-size: 0.72rem; font-weight: 800; text-transform: uppercase; }
.intervention-card { padding: 1.2rem; border: 2px solid var(--accent); border-radius: 1rem; background: #f6fbfa; }
.intervention-card__meta { display: flex; flex-wrap: wrap; gap: 0.45rem; margin-bottom: 1rem; }
.intervention-card__meta span { padding: 0.25rem 0.55rem; border-radius: 999px; background: var(--accent-soft); color: var(--accent-dark); font-size: 0.72rem; font-weight: 800; }
.placeholder-input { padding: 1rem; border: 1px dashed #8ba7a1; border-radius: 0.75rem; color: var(--muted); text-align: center; }
.notice { margin-top: 1rem; padding: 0.75rem 0.9rem; border-radius: 0.75rem; background: var(--warning-soft); color: #5d3d11; font-weight: 650; }
.safety-panel { padding: 1.1rem; border-left: 5px solid #b16b14; background: var(--warning-soft); }
.resource-placeholder { display: flex; justify-content: space-between; gap: 1rem; margin-top: 1rem; padding: 1rem; border: 1px dashed #b88b51; border-radius: 0.8rem; color: var(--warning); }
.closed-state { padding: 2rem 0; text-align: center; }
.closed-state h1 { max-width: none; }
.closed-state__mark { display: grid; width: 3.5rem; height: 3.5rem; margin: 0 auto 1rem; place-items: center; border-radius: 50%; background: var(--accent-soft); color: var(--accent-dark); font-size: 1.7rem; font-weight: 900; }

.footer { display: flex; justify-content: space-between; gap: 1rem; padding: 0.9rem 0.25rem; color: var(--muted); font-size: 0.75rem; }
.modal-backdrop { position: fixed; z-index: 10; inset: 0; display: grid; place-items: center; padding: 1rem; background: rgba(16, 39, 45, 0.58); }
.modal { width: min(100%, 520px); padding: 1.5rem; border-radius: 1rem; background: var(--surface); box-shadow: var(--shadow); }
.qa-toolbar { margin-top: 1rem; padding: 0.75rem; border: 1px dashed #8e78a8; border-radius: 0.75rem; background: #f7f3fb; font-size: 0.85rem; }
.qa-toolbar summary { cursor: pointer; font-weight: 800; }
.qa-toolbar__body { margin-top: 0.75rem; }

@media (max-width: 680px) {
  .app-shell { width: min(100% - 1rem, 860px); padding-top: 0.75rem; }
  .topbar { display: grid; grid-template-columns: minmax(0, 1fr) auto; align-items: flex-start; }
  .wordmark { overflow-wrap: anywhere; }
  .topbar__actions { flex-direction: column; }
  .topbar__actions .button { min-height: 2.2rem; padding: 0.45rem 0.65rem; font-size: 0.8rem; }
  .screen-card { border-radius: 1rem; }
  .boundary-grid, .choice-list--compact { grid-template-columns: 1fr; }
  .progress__item { flex-direction: column; gap: 0.2rem; font-size: 0.7rem; }
  .turn { max-width: 92%; }
  .resource-placeholder, .footer { flex-direction: column; }
  .actions--split { align-items: stretch; flex-direction: column-reverse; }
  .actions--split .button, .actions--end .button { width: 100%; }
}

@media (prefers-reduced-motion: no-preference) {
  .choice-card, .button { transition: border-color 120ms ease, background-color 120ms ease, transform 120ms ease; }
  .choice-card:hover { transform: translateY(-1px); }
}