[hidden] { display: none !important; }
:root {
  --bg: #f7f8fa; --fg: #1d2330; --muted: #5b6475; --line: #d8dde6; --card: #fff;
  --accent: #1f5f8b; --danger: #b3261e;
  --p3: #c62828; --p2: #ef6c00; --p1: #f9a825; --p0: #2e7d32; --pk: #5e35b1;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #14171c; --fg: #e8ebf0; --muted: #a3acbb; --line: #2c323c; --card: #1c2027; --accent: #6aaee0; }
}
* { box-sizing: border-box; }
body { margin: 0; font: 16px/1.5 system-ui, -apple-system, "Hiragino Sans", "Noto Sans JP", sans-serif;
       background: var(--bg); color: var(--fg); padding: env(safe-area-inset-top) 16px 32px; }
header { display: flex; align-items: baseline; gap: 12px; padding: 12px 0 4px; }
h1 { font-size: 20px; margin: 0; }
h2 { font-size: 18px; }
.who { margin: 0; color: var(--muted); font-size: 14px; }
nav { display: grid; grid-template-columns: repeat(4, 1fr); gap: 4px; margin: 8px 0 12px; }
nav button { padding: 10px 2px; font-size: 13px; }
nav button[aria-selected="true"] { background: var(--accent); color: #fff; border-color: var(--accent); }
button, .button { display: inline-block; font: inherit; padding: 10px 14px; border-radius: 10px;
                  border: 1px solid var(--line); background: var(--card); color: var(--fg); cursor: pointer;
                  text-decoration: none; text-align: center; }
.primary { background: var(--accent); color: #fff; border-color: var(--accent); }
.danger { color: var(--danger); border-color: var(--danger); }
.row { display: flex; flex-wrap: wrap; gap: 8px; margin: 8px 0; }
input, select { font: inherit; padding: 8px; border-radius: 8px; border: 1px solid var(--line);
                background: var(--card); color: var(--fg); max-width: 100%; }
#setup-text { width: 100%; margin: 8px 0; text-transform: uppercase; }
.hint { color: var(--muted); font-size: 14px; }
.msg { min-height: 1.5em; }
.msg.err { color: var(--danger); }
.modes { display: grid; grid-template-columns: repeat(3, 1fr); gap: 6px; margin: 8px 0; }
.modes button { font-size: 13px; padding: 8px 4px; border-width: 2px; }
.modes button[aria-checked="true"] { outline: 3px solid var(--accent); outline-offset: 1px; }
.m2 { border-color: var(--p2); }
.m0 { border-color: var(--p0); } .mk { border-color: var(--pk); }
.cal { display: grid; grid-template-columns: repeat(7, 1fr); gap: 3px; }
.cal .wd { text-align: center; font-size: 12px; color: var(--muted); }
.cal button { padding: 6px 0; min-height: 52px; font-size: 14px; border-radius: 8px; display: flex;
              flex-direction: column; align-items: center; justify-content: center; gap: 2px; }
.cal button .mark { font-size: 11px; line-height: 1.1; }
.cal button.p2 { background: var(--p2); color: #fff; }
.cal button.p0 { background: var(--p0); color: #fff; }
.cal button.duty { background: var(--pk); color: #fff; }
.cal .sun { color: var(--p3); } .cal .sat { color: var(--accent); }
.qr { background: #fff; padding: 12px; border-radius: 12px; display: flex; justify-content: center; }
.qr svg, .qr img { width: min(80vw, 360px); height: auto; image-rendering: pixelated; }
code { word-break: break-all; font-size: 12px; }
#shift-list { padding-left: 1.2em; }
.scanner { position: fixed; inset: 0; background: #000; color: #fff; display: flex; flex-direction: column;
           align-items: center; justify-content: center; gap: 12px; z-index: 10; }
.scanner video { width: 100%; max-height: 70vh; object-fit: cover; }