:root {
  --bg: #eef1f5; --card: #fff; --text: #1d2330; --muted: #6b7380; --line: #e2e6ec;
  --field: #f5f7fa; --accent: #0a72ef; --digit: #0a72ef; --symbol: #e0332e;
  --weak: #e0332e; --fair: #f0a020; --good: #2fa84f;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #14171c; --card: #1f242c; --text: #e8ebf0; --muted: #98a0ad; --line: #323944;
    --field: #282e37; --digit: #4ea1ff; --symbol: #ff6b62; }
}
* { box-sizing: border-box; }
body { margin: 0; min-height: 100vh; background: var(--bg); color: var(--text);
  font: 15px/1.6 -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Noto Sans JP", sans-serif;
  display: flex; flex-direction: column; align-items: center; padding: 32px 16px; }
.card { width: 100%; max-width: 460px; background: var(--card); border-radius: 14px;
  box-shadow: 0 6px 30px rgba(0,0,0,.08); padding: 20px 20px 8px; }
h1 { font-size: 18px; margin: 0 0 14px; text-align: center; }
.output { display: flex; gap: 8px; align-items: flex-start; }
.pw { flex: 1; min-width: 0; min-height: 46px; padding: 11px 12px; border: 1px solid var(--line);
  border-radius: 8px; font: 16px/1.5 ui-monospace, "SF Mono", Menlo, monospace;
  word-break: break-all; user-select: all; }
.pw .d { color: var(--digit); } .pw .s { color: var(--symbol); }
.out-actions { display: flex; flex-direction: column; gap: 6px; }
button { font: inherit; cursor: pointer; border-radius: 8px; }
.primary { background: var(--accent); color: #fff; border: 0; padding: 8px 14px; font-weight: 600; white-space: nowrap; }
.icon-btn { background: var(--field); color: var(--text); border: 1px solid var(--line);
  height: 38px; display: grid; place-items: center; }
.icon-btn:active svg { transform: rotate(90deg); transition: transform .15s; }
.meter { height: 4px; background: var(--line); border-radius: 2px; margin-top: 10px; overflow: hidden; }
#bar { height: 100%; width: 0; transition: width .2s, background .2s; }
.strength { margin: 6px 0 4px; font-size: 13px; color: var(--muted); }
.row { display: flex; align-items: center; gap: 12px; padding: 11px 0; border-top: 1px solid var(--line); }
.row > :first-child { flex: 1; }
select, input[type=number] { font: inherit; color: var(--text); background: var(--field);
  border: 1px solid var(--line); border-radius: 8px; padding: 6px 8px; }
input[type=number] { width: 64px; text-align: center; }
input[type=range] { flex: 2; accent-color: var(--accent); }
.row > label[for=len] { flex: 0 0 auto; }
.sw { position: relative; width: 44px; height: 26px; flex: none; }
.sw input { position: absolute; opacity: 0; inset: 0; margin: 0; cursor: pointer; z-index: 1; }
.sw i { position: absolute; inset: 0; background: var(--line); border-radius: 13px; transition: background .15s; }
.sw i::after { content: ""; position: absolute; top: 3px; left: 3px; width: 20px; height: 20px;
  background: #fff; border-radius: 50%; transition: transform .15s; box-shadow: 0 1px 2px rgba(0,0,0,.25); }
.sw input:checked + i { background: var(--accent); }
.sw input:checked + i::after { transform: translateX(18px); }
.sw input:focus-visible + i { outline: 2px solid var(--accent); outline-offset: 2px; }
[hidden] { display: none !important; }
.about { border-top: 1px solid var(--line); padding: 10px 0; font-size: 13px; color: var(--muted); }
.about summary { cursor: pointer; color: var(--text); }
.about ul { padding-left: 18px; margin: 8px 0 0; }
.err { color: var(--weak); max-width: 460px; }