:root {
  --bg: #faf9f7;
  --fg: #1c1a17;
  --muted: #6b6660;
  --line: #e2ded8;
  --card: #fff;
  --user: #2f6f5e;
  --accent: #2f6f5e;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #16151a; --fg: #eceaf0; --muted: #9a95a3; --line: #2f2d36;
    --card: #201f26; --user: #3d8e77; --accent: #6fbfa6;
  }
}

* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Noto Sans JP",
               "Yu Gothic UI", Meiryo, sans-serif;
  font-size: 16px;
  line-height: 1.75;
}
h1 { font-size: 1.35rem; }
h2 { font-size: 1.1rem; margin-top: 2rem; }
h3 { font-size: 1rem; }
a { color: var(--accent); }
code { font-size: .85em; color: var(--muted); }
.note { color: var(--muted); font-size: .9rem; }
.error { color: #b3261e; font-weight: 600; }
.spacer { flex: 1; }

/* --- sheet pages (consent, survey, done, login) --- */
.sheet {
  max-width: 40rem;
  margin: 0 auto;
  padding: 1.5rem 1.25rem 4rem;
}
.sheet ul { padding-left: 1.2em; }
.sheet li { margin: .4em 0; }

button, .sheet input[type=text], .sheet input[type=password], textarea {
  font: inherit;
  font-family: inherit;
}
button {
  background: var(--accent);
  color: #fff;
  border: 0;
  border-radius: .5rem;
  padding: .7rem 1.2rem;
  cursor: pointer;
}
button:disabled { opacity: .5; cursor: default; }
button.link {
  background: none; color: var(--accent); padding: .2rem .4rem;
  text-decoration: underline;
}
form.inline { display: inline; }
label { display: block; margin: .8rem 0; }
label input[type=text], label input[type=password], label input[type=number] {
  display: block; width: 100%; max-width: 16rem; padding: .5rem;
  border: 1px solid var(--line); border-radius: .4rem;
  background: var(--card); color: var(--fg);
}
textarea {
  width: 100%; padding: .6rem; border: 1px solid var(--line);
  border-radius: .4rem; background: var(--card); color: var(--fg);
  resize: vertical;
}

/* --- survey --- */
.item { border: 0; border-top: 1px solid var(--line); padding: 1rem 0; margin: 0; }
.item legend { font-weight: 600; padding: 0; }
.scale {
  display: flex; align-items: center; gap: .35rem; flex-wrap: wrap;
  margin-top: .5rem;
}
.anchor { color: var(--muted); font-size: .8rem; }
.tick { margin: 0; text-align: center; }
.tick input { display: block; margin: 0 auto; }
.tick span { font-size: .8rem; color: var(--muted); }

/* --- chat --- */
body.chat { display: flex; flex-direction: column; height: 100dvh; }
.bar {
  display: flex; align-items: center; gap: .75rem;
  padding: .6rem 1rem; border-bottom: 1px solid var(--line);
  background: var(--card); font-size: .9rem; flex-wrap: wrap;
}
.bar #clock { color: var(--muted); }
.bar form { margin-left: auto; }
#log {
  flex: 1; overflow-y: auto; padding: 1rem;
  display: flex; flex-direction: column; gap: .6rem;
}
.msg {
  max-width: 85%; padding: .6rem .9rem; border-radius: 1rem;
  white-space: pre-wrap; overflow-wrap: anywhere;
}
.msg.user { align-self: flex-end; background: var(--user); color: #fff; }
.msg.assistant { align-self: flex-start; background: var(--card); border: 1px solid var(--line); }
.msg.pending { min-width: 3rem; min-height: 1.75rem; opacity: .5; }
#composer {
  display: flex; gap: .5rem; padding: .75rem;
  border-top: 1px solid var(--line); background: var(--card);
  padding-bottom: calc(.75rem + env(safe-area-inset-bottom));
}
#composer textarea { flex: 1; resize: none; max-height: 10rem; }

/* --- admin --- */
body.admin { max-width: 68rem; margin: 0 auto; padding-bottom: 4rem; }
body.admin section { padding: 0 1rem; }
.arm {
  border: 1px solid var(--line); border-radius: .6rem;
  padding: .75rem 1rem; margin-bottom: 1rem; background: var(--card);
}
.arm .row { display: flex; gap: 1rem; align-items: end; flex-wrap: wrap; }
.arm .row label { margin: 0; font-size: .85rem; }
.check { display: inline-block; margin: 0 .75rem 0 0; font-size: .9rem; }
.check input { display: inline; width: auto; }
table { border-collapse: collapse; width: 100%; font-size: .9rem; }
th, td { border-bottom: 1px solid var(--line); padding: .4rem .5rem; text-align: left; }
td.num, th.num { text-align: right; font-variant-numeric: tabular-nums; }
td.q { max-width: 22rem; }
#health-out { padding: 0 1rem; color: var(--muted); font-size: .85rem; }
.cols { display: flex; gap: 1rem; align-items: start; flex-wrap: wrap; }
.col {
  flex: 1 1 18rem; border: 1px solid var(--line); border-radius: .6rem;
  padding: .75rem 1rem; background: var(--card);
}
.col .out { white-space: pre-wrap; min-height: 4rem; }