:root {
  --bg: #f4f5f7;
  --card: #ffffff;
  --text: #1d2330;
  --muted: #5f6b7a;
  --line: #dde1e7;
  --accent: #2357c6;
  --accent-soft: #e8eefb;
  --error: #c62828;
  --error-soft: #fdecec;
  --radius: 12px;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
  color: var(--text);
  line-height: 1.5;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #12151b;
    --card: #1b2029;
    --text: #e7eaf0;
    --muted: #9aa5b4;
    --line: #2d3440;
    --accent: #7aa2ff;
    --accent-soft: #1f2b47;
    --error: #ff7a7a;
    --error-soft: #3a1f22;
  }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--text); }
.wrap { max-width: 820px; margin: 0 auto; padding: 24px 16px 64px; }

h1 { font-size: 1.6rem; line-height: 1.25; margin: 0 0 .4rem; }
h2 { font-size: 1.2rem; margin: 0 0 .75rem; }
.head { margin: 12px 0 20px; }
.subtitle { color: var(--muted); margin: 0; }
.title-alt { font-size: 1.3rem; font-weight: 600; margin: .2rem 0; }
.muted { color: var(--muted); font-size: .9rem; }
.center { text-align: center; }

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px;
  margin-bottom: 20px;
}
.instructions p { margin: 0 0 .7rem; }
.instructions p:last-child { margin-bottom: 0; }
.topnav { text-align: right; font-size: .9rem; }
.topnav a, a { color: var(--accent); }

.btn {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  border: 0;
  border-radius: 999px;
  padding: 12px 28px;
  font: inherit;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
}
@media (prefers-color-scheme: dark) { .btn { color: #0b1020; } }
.btn:disabled { opacity: .6; cursor: wait; }
.btn:focus-visible, .pill input:focus-visible + span, .input:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 2px;
}
.btn-ghost { background: var(--card); color: var(--text); border: 1px solid var(--line); }
.lang-buttons { display: flex; flex-wrap: wrap; gap: 12px; justify-content: center; margin-top: 16px; }
.btn-lang { min-width: 150px; font-size: 1.1rem; }
.survey-list { list-style: none; padding: 0; display: grid; gap: 10px; }

.legend {
  display: flex; flex-wrap: wrap; gap: 6px 14px;
  margin: 0 0 12px; padding: 10px 12px;
  background: var(--accent-soft); border-radius: 8px; font-size: .88rem;
}
.legend div { display: flex; gap: 4px; }
.legend dt { font-weight: 700; }
.legend dt::after { content: " ="; }
.legend dd { margin: 0; }

.q { padding: 14px 0; border-top: 1px solid var(--line); }
.q:first-of-type { border-top: 0; }
fieldset { border: 0; margin: 0; padding: 0; min-width: 0; }
.q-text { display: block; font-weight: 500; margin-bottom: 8px; padding: 0; }
.num { color: var(--muted); font-variant-numeric: tabular-nums; }
.req { color: var(--error); }
.help { color: var(--muted); font-size: .88rem; margin: -4px 0 8px; }

.input {
  width: 100%;
  font: inherit;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--bg);
  color: var(--text);
}
.input-short { max-width: 140px; }
.other-input { margin-top: 8px; max-width: 360px; }
.percent { display: flex; align-items: center; gap: 8px; }
.percent .input { max-width: 120px; }

.pills { display: grid; grid-template-columns: repeat(5, 1fr); gap: 6px; }
.pills-choice { display: flex; flex-wrap: wrap; }
.pill { position: relative; cursor: pointer; }
.pill input { position: absolute; opacity: 0; width: 1px; height: 1px; }
.pill span {
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  height: 100%; min-height: 44px; padding: 6px 4px;
  border: 1px solid var(--line); border-radius: 8px;
  background: var(--bg); text-align: center;
  transition: background .1s, border-color .1s;
}
.pills-choice .pill span { min-width: 56px; padding: 6px 14px; }
.pill b { font-size: 1rem; }
.pill small { font-size: .72rem; color: var(--muted); line-height: 1.2; margin-top: 2px; }
.pill:hover span { border-color: var(--accent); }
.pill input:checked + span { background: var(--accent); border-color: var(--accent); color: #fff; }
.pill input:checked + span small { color: inherit; }
@media (prefers-color-scheme: dark) { .pill input:checked + span { color: #0b1020; } }
@media (max-width: 560px) {
  .pill small { display: none; }
  .wrap { padding-top: 12px; }
  .card { padding: 16px; }
}

.has-error .q-text { color: var(--error); }
.has-error .pill span, .has-error .input { border-color: var(--error); }
.error { color: var(--error); font-size: .88rem; margin: 6px 0 0; }
.alert {
  background: var(--error-soft); color: var(--error);
  border: 1px solid var(--error); border-radius: var(--radius);
  padding: 12px 16px; margin-bottom: 16px;
}

.progress {
  position: sticky; top: 0; z-index: 10;
  height: 28px; margin: -24px -16px 8px;
  background: var(--card); border-bottom: 1px solid var(--line);
  font-size: .8rem; color: var(--muted);
  display: flex; align-items: center; justify-content: flex-end; padding: 0 16px;
}
.progress-bar { position: absolute; left: 0; bottom: -1px; height: 3px; width: 0; background: var(--accent); transition: width .2s; }
@media (max-width: 560px) { .progress { margin-top: -12px; } }

.thanks .check {
  width: 56px; height: 56px; line-height: 56px; margin: 8px auto 12px;
  border-radius: 50%; background: var(--accent); color: #fff; font-size: 28px;
}