:root {
  --bg: #f8f5fd;
  --card: #ffffff;
  --text: #241834;
  --sub: #776a8a;
  --accent: #7c3aed;
  --accent2: #db2777;
  --accent-soft: #ece4fc;
  --border: #e4dcf1;
  --ok: #16a34a;
  --warn: #eab308;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #151020;
    --card: #1d1729;
    --text: #ece6f5;
    --sub: #a396b8;
    --accent: #a78bfa;
    --accent2: #f472b6;
    --accent-soft: #2c2043;
    --border: #342a4a;
  }
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: "Pretendard", "Apple SD Gothic Neo", "Malgun Gothic", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}
body::before {
  content: "";
  display: block;
  height: 6px;
  background: linear-gradient(90deg, var(--accent), var(--accent2));
}
.wrap { max-width: 760px; margin: 0 auto; padding: 24px 16px 64px; }
h1 { font-size: 24px; margin-bottom: 4px; }
h1::after {
  content: "";
  display: block;
  width: 56px;
  height: 5px;
  margin-top: 10px;
  border-radius: 3px;
  background: linear-gradient(90deg, var(--accent), var(--accent2));
}
p.desc { color: var(--sub); font-size: 14px; margin: 10px 0 20px; }
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 20px;
  margin-bottom: 16px;
}
.card h2 { font-size: 16px; margin-bottom: 12px; }
label { display: block; font-size: 13px; color: var(--sub); margin: 10px 0 4px; }
input[type="text"], input[type="number"], input[type="date"], select, textarea {
  width: 100%;
  padding: 10px 12px;
  font-size: 16px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--bg);
  color: var(--text);
}
input:focus, select:focus, textarea:focus { outline: 2px solid var(--accent); border-color: transparent; }
button.primary {
  width: 100%;
  padding: 13px;
  margin-top: 16px;
  font-size: 16px;
  font-weight: 700;
  color: #fff;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  border: none;
  border-radius: 10px;
  cursor: pointer;
}
button.primary:hover { filter: brightness(1.07); }
button.ghost {
  padding: 8px 14px;
  font-size: 14px;
  color: var(--accent);
  background: var(--accent-soft);
  border: none;
  border-radius: 8px;
  cursor: pointer;
}
.result { display: none; }
.result.show { display: block; border-color: var(--accent); }
.big { font-size: 30px; font-weight: 800; color: var(--accent); }
.row { display: flex; gap: 10px; }
.row > * { flex: 1; }
table.plain { width: 100%; border-collapse: collapse; font-size: 14px; }
table.plain td { padding: 7px 4px; border-bottom: 1px solid var(--border); }
table.plain td:last-child { text-align: right; font-variant-numeric: tabular-nums; }
.muted { color: var(--sub); font-size: 12px; margin-top: 12px; }
.tabs { display: flex; gap: 8px; margin-bottom: 16px; }
.tabs button {
  flex: 1;
  padding: 10px;
  font-size: 15px;
  font-weight: 600;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--card);
  color: var(--sub);
  cursor: pointer;
}
.tabs button.on {
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  border-color: transparent;
  color: #fff;
}
.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chips label {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin: 0;
  padding: 8px 12px;
  font-size: 14px;
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 999px;
  cursor: pointer;
  user-select: none;
}
.chips input { accent-color: var(--accent); }
.chips label:has(input:checked) { background: var(--accent-soft); border-color: var(--accent); }
.bar { height: 10px; background: var(--border); border-radius: 999px; overflow: hidden; margin-top: 8px; }
.bar > div {
  height: 100%;
  background: linear-gradient(90deg, var(--accent), var(--accent2));
  border-radius: 999px;
  transition: width .3s;
}
.ad {
  min-height: 100px;
  margin: 16px 0;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1.5px dashed var(--border);
  border-radius: 12px;
  background: var(--card);
  color: var(--sub);
  font-size: 12px;
  letter-spacing: 2px;
}
.ad::after { content: "AD"; opacity: .5; }
footer { text-align: center; color: var(--sub); font-size: 12px; margin-top: 40px; }
@media (max-width: 420px) {
  .wrap { padding: 18px 12px 48px; }
  h1 { font-size: 21px; }
  .big { font-size: 26px; }
}
/* 사용법 & FAQ */
.howto p { font-size: 14.5px; color: var(--text); margin-bottom: 10px; word-break: keep-all; }
.howto ol { margin: 0 0 4px 18px; font-size: 14.5px; line-height: 1.9; }
details.faq { border-bottom: 1px solid var(--border); }
details.faq:last-of-type { border-bottom: none; }
details.faq summary {
  padding: 12px 0; font-weight: 700; font-size: 14.5px;
  cursor: pointer; list-style: none; word-break: keep-all;
}
details.faq summary::-webkit-details-marker { display: none; }
details.faq summary::before { content: "Q. "; color: var(--accent); }
details.faq p {
  margin: 0 0 12px; font-size: 14px; color: var(--sub);
  line-height: 1.8; word-break: keep-all;
}