:root {
  --bg: #f6f8fb;
  --card: #ffffff;
  --ink: #1b2430;
  --muted: #5d6b7e;
  --line: #dde3ec;
  --accent: #2563eb;
  --accent-ink: #ffffff;
  --accent-soft: #e8f0ff;
  --danger: #d33a3a;
  --ok: #1f8f55;
  --radius: 14px;
  --shadow: 0 1px 2px rgba(20, 30, 50, .06), 0 6px 20px rgba(20, 30, 50, .06);
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #11161d; --card: #1a212b; --ink: #e8edf4; --muted: #9aa8bb;
    --line: #2b3542; --accent: #5b8cff; --accent-ink: #0b1020; --accent-soft: #1d2a45;
    --danger: #ff6b6b; --ok: #4cc88a;
    --shadow: 0 1px 2px rgba(0,0,0,.4);
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font: 16px/1.8 -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Noto Sans JP", "Yu Gothic", Meiryo, sans-serif;
}
a { color: var(--accent); }
img, canvas { max-width: 100%; }
.wrap { max-width: 960px; margin: 0 auto; padding: 0 16px; }

/* header / footer */
.site-header { background: var(--card); border-bottom: 1px solid var(--line); }
.site-header .wrap { display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; padding-top: 10px; padding-bottom: 10px; }
.brand { font-weight: 800; font-size: 1.15rem; color: var(--ink); text-decoration: none; letter-spacing: .02em; }
.brand span { color: var(--accent); }
.nav { display: flex; gap: 4px 14px; flex-wrap: wrap; }
.nav a { color: var(--muted); text-decoration: none; font-size: .92rem; padding: 4px 0; }
.nav a:hover, .nav a[aria-current="page"] { color: var(--accent); }
.site-footer { margin-top: 56px; padding: 28px 0 40px; border-top: 1px solid var(--line); color: var(--muted); font-size: .9rem; background: var(--card); }
.site-footer .links { display: flex; flex-wrap: wrap; gap: 6px 18px; margin-bottom: 10px; }
.site-footer a { color: var(--muted); }

/* typography */
h1 { font-size: 1.6rem; line-height: 1.4; margin: 28px 0 8px; }
h2 { font-size: 1.25rem; margin: 40px 0 10px; padding-left: 10px; border-left: 4px solid var(--accent); line-height: 1.5; }
h3 { font-size: 1.05rem; margin: 24px 0 6px; }
.lead { color: var(--muted); margin: 0 0 18px; }
.crumbs { font-size: .85rem; color: var(--muted); margin-top: 14px; }
.crumbs a { color: var(--muted); }
p, li { overflow-wrap: anywhere; }

/* tool card */
.tool { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); padding: 18px; margin: 14px 0; }
.drop {
  border: 2px dashed var(--accent); background: var(--accent-soft); border-radius: var(--radius);
  padding: 28px 16px; text-align: center; cursor: pointer; transition: background .15s;
}
.drop.over { background: color-mix(in srgb, var(--accent) 20%, transparent); }
.drop strong { display: block; font-size: 1.1rem; }
.drop small { color: var(--muted); }
.drop input { display: none; }
.btn {
  appearance: none; border: 1px solid var(--line); background: var(--card); color: var(--ink);
  font: inherit; font-weight: 600; padding: 10px 16px; border-radius: 10px; cursor: pointer; min-height: 44px;
}
.btn:hover:not(:disabled) { border-color: var(--accent); color: var(--accent); }
.btn.primary { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); }
.btn.primary:hover:not(:disabled) { filter: brightness(1.08); color: var(--accent-ink); }
.btn.danger { color: var(--danger); }
.btn:disabled { opacity: .45; cursor: not-allowed; }
.btn.sm { min-height: 36px; padding: 4px 10px; font-size: .9rem; }
.bar { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; margin: 14px 0 0; }
.bar .grow { flex: 1; }
.hint { color: var(--muted); font-size: .9rem; margin: 8px 0 0; }
.status { margin-top: 12px; min-height: 1.6em; font-size: .95rem; }
.status.err { color: var(--danger); }
.status.ok { color: var(--ok); }
input[type="text"] { font: inherit; padding: 9px 12px; border: 1px solid var(--line); border-radius: 10px; background: var(--card); color: var(--ink); min-height: 44px; min-width: 0; }
select { font: inherit; padding: 9px 10px; border: 1px solid var(--line); border-radius: 10px; background: var(--card); color: var(--ink); min-height: 44px; }

/* file list (merge / images) */
.flist { list-style: none; margin: 14px 0 0; padding: 0; display: grid; gap: 8px; }
.flist li { display: flex; gap: 10px; align-items: center; border: 1px solid var(--line); border-radius: 10px; padding: 8px 10px; background: var(--card); }
.flist li.dragging { opacity: .4; }
.flist .no { width: 26px; height: 26px; border-radius: 50%; background: var(--accent-soft); color: var(--accent); display: grid; place-items: center; font-size: .8rem; font-weight: 700; flex: none; }
.flist .name { flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.flist .meta { color: var(--muted); font-size: .8rem; flex: none; }
.flist img.pv { width: 44px; height: 44px; object-fit: cover; border-radius: 6px; flex: none; background: var(--line); }
.flist .acts { display: flex; gap: 4px; flex: none; }
.flist .grip { cursor: grab; color: var(--muted); flex: none; user-select: none; }

/* page grid */
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 12px; margin-top: 14px; }
.pcard { border: 2px solid var(--line); border-radius: 12px; padding: 8px; background: var(--card); position: relative; display: flex; flex-direction: column; align-items: center; gap: 6px; }
.pcard.sel { border-color: var(--accent); background: var(--accent-soft); }
.pcard.del { border-color: var(--danger); }
.pcard.del .thumb { opacity: .35; }
.pcard .thumb { width: 134px; height: 134px; display: grid; place-items: center; overflow: hidden; background: color-mix(in srgb, var(--line) 45%, transparent); border-radius: 6px; }
.pcard .thumb canvas { background: #fff; box-shadow: 0 1px 4px rgba(0,0,0,.25); transition: transform .2s; }
.pcard .pn { font-size: .85rem; color: var(--muted); }
.pcard .tag { position: absolute; top: 6px; left: 6px; background: var(--danger); color: #fff; font-size: .72rem; font-weight: 700; padding: 1px 7px; border-radius: 8px; display: none; }
.pcard.del .tag { display: block; }
.pcard .chk { position: absolute; top: 6px; right: 6px; width: 22px; height: 22px; accent-color: var(--accent); }
.pcard .row { display: flex; gap: 6px; }
.pcard.click { cursor: pointer; }

/* content blocks */
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 12px; margin: 14px 0; }
.cardlink { display: block; background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 16px; text-decoration: none; color: var(--ink); box-shadow: var(--shadow); }
.cardlink:hover { border-color: var(--accent); }
.cardlink b { display: block; font-size: 1.05rem; color: var(--accent); }
.cardlink span { color: var(--muted); font-size: .92rem; }
.steps { counter-reset: s; list-style: none; padding: 0; }
.steps li { counter-increment: s; position: relative; padding: 8px 0 8px 44px; }
.steps li::before { content: counter(s); position: absolute; left: 0; top: 8px; width: 30px; height: 30px; border-radius: 50%; background: var(--accent); color: var(--accent-ink); display: grid; place-items: center; font-weight: 700; }
details { background: var(--card); border: 1px solid var(--line); border-radius: 10px; padding: 10px 14px; margin: 8px 0; }
summary { cursor: pointer; font-weight: 700; }
details p { margin: 8px 0 2px; }
.notice { background: var(--accent-soft); border-radius: 10px; padding: 12px 14px; font-size: .95rem; }
.ad-slot { min-height: 0; margin: 22px 0; text-align: center; }
.toast { position: fixed; left: 50%; bottom: 20px; transform: translateX(-50%); background: #1b2430; color: #fff; padding: 10px 18px; border-radius: 22px; font-size: .92rem; z-index: 50; max-width: 92vw; }
table.plain { border-collapse: collapse; width: 100%; font-size: .95rem; }
table.plain th, table.plain td { border: 1px solid var(--line); padding: 8px 10px; text-align: left; vertical-align: top; }
table.plain th { background: var(--accent-soft); width: 30%; }
.prose p { margin: 0 0 1em; }
.prose ul, .prose ol { padding-left: 1.4em; }
.todo { background: #fff3cd; color: #5b4200; padding: 0 4px; border-radius: 4px; }
@media (max-width: 520px) {
  h1 { font-size: 1.4rem; }
  .flist .meta { display: none; }
}