:root {
  color-scheme: light dark;
  --bg: #faf9f7;
  --surface: #ffffff;
  --ink: #1b1a18;
  --ink-soft: #5d5952;
  --line: #e2ded7;
  --accent: #2f5d50;
  --accent-ink: #ffffff;
  --accent-soft: #e8f0ec;
  --danger: #a5321f;
  --radius: 10px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #16181a;
    --surface: #1e2124;
    --ink: #ecebe8;
    --ink-soft: #a4a29d;
    --line: #33383c;
    --accent: #79b8a2;
    --accent-ink: #12251e;
    --accent-soft: #24322d;
    --danger: #e08a78;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0 auto;
  padding: 0 1.25rem 5rem;
  max-width: 64rem;
  background: var(--bg);
  color: var(--ink);
  font: 16px/1.6 ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

.masthead { padding: 3rem 0 1.5rem; }
.eyebrow {
  margin: 0 0 .35rem;
  font-size: .75rem;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--ink-soft);
}
h1 { margin: 0; font-size: 1.9rem; line-height: 1.2; letter-spacing: -.01em; }
h2 { margin: 0 0 .35rem; font-size: 1.35rem; line-height: 1.25; letter-spacing: -.01em; }

.muted { color: var(--ink-soft); }
.loading { color: var(--ink-soft); padding: 2rem 0; }

/* progress ---------------------------------------------------------- */
.progress { margin-bottom: 1.75rem; }
.progress-bar {
  height: 5px;
  border-radius: 99px;
  background: var(--line);
  overflow: hidden;
}
.progress-bar span {
  display: block;
  height: 100%;
  width: 0;
  background: var(--accent);
  transition: width .25s ease;
}
.progress-label {
  margin: .5rem 0 0;
  font-size: .8rem;
  color: var(--ink-soft);
}

/* sections ---------------------------------------------------------- */
.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.75rem;
}
.section-intro {
  margin: .5rem 0 0;
  color: var(--ink-soft);
  white-space: pre-line;
}

.question { padding: 1.6rem 0; border-top: 1px solid var(--line); }
.question:first-of-type { border-top: 0; padding-top: 1.25rem; }

.question-label {
  display: block;
  font-weight: 600;
  margin-bottom: .2rem;
}
.required-mark { color: var(--danger); margin-left: .15rem; }
.question-help {
  margin: 0 0 .8rem;
  font-size: .9rem;
  color: var(--ink-soft);
}

/* choices ----------------------------------------------------------- */
.choice {
  display: flex;
  gap: .7rem;
  align-items: flex-start;
  padding: .6rem .8rem;
  margin-bottom: .35rem;
  border: 1px solid var(--line);
  border-radius: 8px;
  cursor: pointer;
  transition: border-color .12s ease, background .12s ease;
}
.choice:hover { border-color: var(--accent); }
.choice input { margin-top: .3rem; accent-color: var(--accent); flex: none; }
.choice:has(input:checked) { border-color: var(--accent); background: var(--accent-soft); }
.choice:has(input:focus-visible) { outline: 2px solid var(--accent); outline-offset: 2px; }

/* free text --------------------------------------------------------- */
select {
  width: 100%;
  padding: .65rem .75rem;
  font: inherit;
  color: var(--ink);
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 8px;
  cursor: pointer;
}
select:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
  border-color: var(--accent);
}

input[type="text"], input[type="email"], textarea {
  width: 100%;
  padding: .65rem .75rem;
  font: inherit;
  color: var(--ink);
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 8px;
}
textarea { min-height: 7rem; resize: vertical; }
input:focus-visible, textarea:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
  border-color: var(--accent);
}
.other-field { margin-top: .5rem; }

/* scale ------------------------------------------------------------- */
.scale { display: flex; gap: .4rem; }
.scale-point {
  flex: 1;
  text-align: center;
  padding: .6rem .2rem;
  border: 1px solid var(--line);
  border-radius: 8px;
  cursor: pointer;
}
.scale-point input { position: absolute; opacity: 0; pointer-events: none; }
.scale-point:has(input:focus-visible) { outline: 2px solid var(--accent); outline-offset: 2px; }
.scale-point:has(input:checked) {
  border-color: var(--accent);
  background: var(--accent);
  color: var(--accent-ink);
  font-weight: 600;
}
.scale-ends {
  display: flex;
  justify-content: space-between;
  font-size: .8rem;
  color: var(--ink-soft);
  margin-top: .4rem;
}

/* errors ------------------------------------------------------------ */
.field-error {
  margin: .5rem 0 0;
  font-size: .875rem;
  color: var(--danger);
  font-weight: 500;
}
.question.has-error .question-label { color: var(--danger); }

/* controls ---------------------------------------------------------- */
.controls {
  display: flex;
  gap: .75rem;
  justify-content: space-between;
  margin-top: 1.5rem;
}
button, .button {
  font: inherit;
  font-weight: 600;
  padding: .7rem 1.4rem;
  border-radius: 8px;
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none;
  display: inline-block;
}
.primary { background: var(--accent); color: var(--accent-ink); }
.primary:hover { filter: brightness(1.08); }
.ghost { background: transparent; color: var(--ink); border-color: var(--line); }
.ghost:hover { border-color: var(--accent); }
button:disabled { opacity: .5; cursor: progress; }
/* A finished state, not a busy one: full strength and an ordinary cursor, so
   the disabled button reads as a receipt rather than as work still running. */
button.submitted:disabled { opacity: 1; cursor: default; }
#back[hidden] { display: inline-block; visibility: hidden; }

/* done -------------------------------------------------------------- */
.done { text-align: center; padding: 3rem 1rem; }
.done h2 { font-size: 1.6rem; }
.participant-id {
  display: inline-block;
  margin: .25rem 0 0;
  padding: .6rem 1rem;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 1.15rem;
  letter-spacing: .08em;
  color: var(--ink);
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
  user-select: all;
}

/* admin ------------------------------------------------------------- */
.stat { font-size: 1.1rem; margin: 0 0 .25rem; }
.stat strong { font-size: 2rem; }
.breakdown { width: 100%; border-collapse: collapse; margin: 1.5rem 0; }
.breakdown th, .breakdown td {
  text-align: left;
  padding: .5rem .4rem;
  border-bottom: 1px solid var(--line);
}
.breakdown .num { text-align: right; }
.actions { display: flex; gap: .75rem; margin: 0; }

.footer {
  margin-top: 3rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--line);
  font-size: .8rem;
  color: var(--ink-soft);
}