:root {
  color-scheme: light dark;
  --bg: #f6f4ef; --card: #ffffff; --text: #1f2328; --muted: #6b7280;
  --line: #e2ded5; --accent: #bc002d; --accent-text: #ffffff;
  --ok: #2e9e5b; --bad: #c0392b;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #16181c; --card: #1f2227; --text: #e8e6e1; --muted: #9aa0a8;
    --line: #30343b; --accent: #e0526e; --accent-text: #16181c;
    --ok: #5cc98a; --bad: #f08a7d;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0; min-height: 100vh; background: var(--bg); color: var(--text);
  font-family: system-ui, "Hiragino Sans", "Noto Sans JP", sans-serif; line-height: 1.5;
}
header.top {
  display: flex; align-items: center; gap: 1rem; flex-wrap: wrap;
  padding: .8rem 1.2rem; border-bottom: 1px solid var(--line); background: var(--card);
}
header.top .brand { font-weight: 700; margin-right: auto; color: inherit; text-decoration: none; }
header.top a { color: var(--text); }
main { max-width: 760px; margin: 0 auto; padding: 1.5rem 1.2rem 3rem; }
main.narrow { max-width: 420px; padding-top: 12vh; }
h1 { font-size: 1.5rem; margin: 0 0 1rem; }
h2 { font-size: 1.15rem; margin: 2rem 0 .8rem; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 1.4rem; }
label { display: block; margin: .9rem 0 .3rem; font-size: .9rem; color: var(--muted); }
input, select {
  width: 100%; padding: .6rem .7rem; font: inherit; color: var(--text);
  background: var(--bg); border: 1px solid var(--line); border-radius: 8px;
}
input:focus, select:focus, button:focus-visible { outline: 2px solid var(--accent); outline-offset: 1px; }
button {
  font: inherit; cursor: pointer; padding: .6rem 1rem; border-radius: 8px;
  border: 1px solid var(--line); background: var(--card); color: var(--text);
}
button.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-text); font-weight: 600; }
button.wide { width: 100%; margin-top: 1.2rem; }
button.small { padding: .3rem .6rem; font-size: .85rem; }
button:disabled { opacity: .6; cursor: default; }
.msg { margin: 1rem 0 0; font-size: .92rem; min-height: 1.4em; }
.msg.bad { color: var(--bad); } .msg.ok { color: var(--ok); }
.muted { color: var(--muted); font-size: .9rem; }
.captcha { margin-top: 1rem; min-height: 0; }
.warn { border-left: 4px solid var(--bad); padding: .6rem .9rem; background: var(--card); border-radius: 6px; margin-bottom: 1rem; }
table { width: 100%; border-collapse: collapse; }
th, td { text-align: left; padding: .55rem .4rem; border-bottom: 1px solid var(--line); vertical-align: middle; }
th { font-size: .82rem; color: var(--muted); font-weight: 600; }
td.actions { display: flex; gap: .4rem; flex-wrap: wrap; }
.tag { font-size: .78rem; padding: .1rem .45rem; border-radius: 999px; border: 1px solid var(--line); color: var(--muted); }
.tag.admin { border-color: var(--accent); color: var(--accent); }
.row { display: grid; grid-template-columns: 1fr 1fr 140px; gap: .8rem; align-items: end; }
@media (max-width: 600px) { .row { grid-template-columns: 1fr; } }
[hidden] { display: none !important; }