:root {
  --bg: #f5f6f8;
  --surface: #ffffff;
  --ink: #1d2433;
  --muted: #667085;
  --line: #e3e6ec;
  --brand: #1f4e8c;
  --brand-soft: #e8f0fb;
  --ng: #c62f2f;
  --ng-soft: #fdeeee;
  --warn: #a86400;
  --warn-soft: #fff5e3;
  --ok: #1d7a46;
  --ok-soft: #e9f6ee;
  --info: #475467;
  --info-soft: #f0f2f5;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #11141a; --surface: #1a1f28; --ink: #e7eaf0; --muted: #98a2b3; --line: #2b3240;
    --brand: #7fb0f0; --brand-soft: #1d2a3d;
    --ng: #ff8a80; --ng-soft: #3a1f1f; --warn: #ffc067; --warn-soft: #3a2e17;
    --ok: #6fd69a; --ok-soft: #173325; --info: #c0c7d2; --info-soft: #232a35;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font-family: "Hiragino Sans", "Noto Sans JP", system-ui, sans-serif; line-height: 1.7;
}
button, textarea, input { font: inherit; color: inherit; }

.top { display: flex; justify-content: space-between; align-items: center; padding: 16px 24px; background: var(--surface); border-bottom: 1px solid var(--line); gap: 12px; }
.brand { display: flex; align-items: center; gap: 12px; }
.logo { width: 40px; height: 40px; border-radius: 10px; background: var(--brand); color: #fff; display: grid; place-items: center; font-weight: 700; font-size: 20px; }
h1 { font-size: 18px; margin: 0; }
.sub { margin: 0; font-size: 12px; color: var(--muted); }
.status { font-size: 12px; padding: 4px 10px; border-radius: 999px; background: var(--info-soft); color: var(--info); white-space: nowrap; }
.status.ai { background: var(--ok-soft); color: var(--ok); }
.status.demo { background: var(--warn-soft); color: var(--warn); }

.tabs { display: flex; gap: 4px; padding: 12px 24px 0; max-width: 1100px; margin: 0 auto; overflow-x: auto; }
.tab { border: 0; background: none; padding: 10px 16px; border-radius: 10px 10px 0 0; cursor: pointer; color: var(--muted); white-space: nowrap; }
.tab.is-active { background: var(--surface); color: var(--brand); font-weight: 700; box-shadow: 0 -1px 0 var(--line) inset; }

main { max-width: 1100px; margin: 0 auto; padding: 0 24px 24px; }
.panel { display: none; background: var(--surface); border-radius: 0 12px 12px 12px; padding: 20px; min-height: 60vh; }
.panel.is-active { display: block; }

/* chat */
.chat { display: flex; flex-direction: column; gap: 12px; min-height: 40vh; max-height: 58vh; overflow-y: auto; padding: 4px; }
.msg { max-width: 80%; padding: 12px 16px; border-radius: 14px; }
.msg p { margin: 0 0 6px; } .msg p:last-child { margin: 0; }
.msg.bot { background: var(--brand-soft); align-self: flex-start; border-top-left-radius: 4px; }
.msg.user { background: var(--brand); color: #fff; align-self: flex-end; border-top-right-radius: 4px; }
.msg.loading { color: var(--muted); }
.msg .hit { background: var(--surface); border: 1px solid var(--line); border-radius: 10px; padding: 10px 12px; margin-top: 8px; font-size: 14px; }
.msg .hit h4 { margin: 0 0 4px; font-size: 14px; color: var(--brand); }
.msg ul { margin: 4px 0; padding-left: 1.3em; }
.chips { display: flex; flex-wrap: wrap; gap: 8px; margin: 14px 0; }
.chips button, .samples button { border: 1px solid var(--line); background: var(--surface); padding: 6px 12px; border-radius: 999px; cursor: pointer; font-size: 13px; }
.chips button:hover, .samples button:hover { border-color: var(--brand); color: var(--brand); }
.composer { display: flex; gap: 8px; }
.composer textarea { flex: 1; }
textarea { width: 100%; border: 1px solid var(--line); background: var(--bg); border-radius: 10px; padding: 10px 12px; resize: vertical; }
.primary { border: 0; background: var(--brand); color: #fff; padding: 10px 20px; border-radius: 10px; cursor: pointer; font-weight: 700; }
@media (prefers-color-scheme: dark) { .primary, .msg.user { color: #0d1420; } }
.primary:disabled { opacity: .5; cursor: wait; }
.wide { width: 100%; margin-top: 12px; padding: 12px; }

/* check */
.grid { display: grid; grid-template-columns: 1fr 1.2fr; gap: 20px; }
.card { border: 1px solid var(--line); border-radius: 12px; padding: 18px; }
.card h2 { font-size: 16px; margin: 0 0 12px; }
.drop { display: grid; place-items: center; text-align: center; border: 2px dashed var(--line); border-radius: 12px; padding: 22px; cursor: pointer; color: var(--muted); margin-bottom: 12px; }
.drop.has-file { border-color: var(--brand); color: var(--brand); background: var(--brand-soft); }
.drop.drag { border-color: var(--brand); }
.lbl { font-size: 13px; color: var(--muted); }
.samples { display: flex; flex-wrap: wrap; gap: 6px; align-items: center; margin-top: 8px; font-size: 13px; color: var(--muted); }
.muted { color: var(--muted); }
.summary { padding: 12px 14px; border-radius: 10px; background: var(--brand-soft); margin-bottom: 14px; }
.sec { font-size: 13px; color: var(--muted); margin: 16px 0 6px; font-weight: 700; }
.item { display: grid; grid-template-columns: 64px 1fr; gap: 10px; padding: 10px 0; border-bottom: 1px solid var(--line); }
.item:last-child { border-bottom: 0; }
.badge { font-size: 12px; font-weight: 700; text-align: center; border-radius: 6px; padding: 2px 0; height: fit-content; }
.b-NG { background: var(--ng-soft); color: var(--ng); }
.b-要確認 { background: var(--warn-soft); color: var(--warn); }
.b-OK { background: var(--ok-soft); color: var(--ok); }
.b-参考 { background: var(--info-soft); color: var(--info); }
.item b { display: block; font-size: 14px; }
.item small { color: var(--muted); }
.kv { display: grid; grid-template-columns: 7em 1fr; gap: 2px 10px; font-size: 14px; }
.kv dt { color: var(--muted); }
.kv dd { margin: 0; }
.err { color: var(--ng); }

/* rules */
.rules h1 { font-size: 20px; } .rules h2 { font-size: 16px; margin-top: 24px; color: var(--brand); }
.rules table { border-collapse: collapse; width: 100%; font-size: 14px; }
.rules td, .rules th { border: 1px solid var(--line); padding: 6px 10px; text-align: left; }
.rules blockquote { margin: 0; padding: 8px 14px; background: var(--warn-soft); border-radius: 8px; color: var(--warn); }

.foot { text-align: center; font-size: 12px; color: var(--muted); padding: 16px; }
.foot a { color: inherit; }

@media (max-width: 760px) {
  .top { padding: 12px 16px; } .tabs { padding: 8px 16px 0; } main { padding: 0 16px 16px; }
  .panel { padding: 14px; border-radius: 0 0 12px 12px; }
  .grid { grid-template-columns: 1fr; }
  .msg { max-width: 92%; }
  .composer { flex-direction: column; }
}