:root { --brand: #8c1d2f; --ink: #1b2430; --quiet: #4f5b6b; --line: #d5dde7; --tint: #f6eef0; --bg: #ffffff;
  --draft: #7a4b00; --draftbg: #fff4dc; --link: #8c1d2f; }
@media (prefers-color-scheme: dark) {
  :root { --brand: #f0a0ac; --ink: #e8edf3; --quiet: #b3bfcd; --line: #3a4656; --tint: #2a1c20; --bg: #111820;
    --draft: #ffd27a; --draftbg: #3a2e14; --link: #f0a0ac; }
}
* { box-sizing: border-box; }
body { margin: 0; font: 17px/1.55 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; color: var(--ink); background: var(--bg); }
.wrap { max-width: 760px; margin: 0 auto; padding: 0 16px; }
.skip { position: absolute; left: -999px; } .skip:focus { left: 16px; top: 8px; background: var(--bg); padding: 8px; z-index: 9; }
.top { border-bottom: 3px solid var(--brand); }
.bar { display: flex; align-items: center; justify-content: space-between; gap: 12px; min-height: 56px; flex-wrap: wrap; }
.brand { margin: 0; font-weight: 700; font-size: 19px; } .cv { color: var(--brand); } .sub { font-weight: 500; color: var(--quiet); }
.banner { margin: 0; padding: 8px 16px; text-align: center; background: var(--tint); font-size: 14px; }
main, main.wrap { padding-top: 24px; padding-bottom: 32px; } main:focus { outline: none; }
h1 { color: var(--brand); font-size: 28px; line-height: 1.2; margin: 0 0 8px; overflow-wrap: anywhere; }
h2 { font-size: 21px; margin: 28px 0 8px; } h3 { font-size: 18px; margin: 0 0 4px; }
a { color: var(--link); }
label { display: block; font-weight: 600; margin: 0 0 4px; }
input, textarea { width: 100%; max-width: 440px; font: inherit; padding: 10px 12px; border: 1px solid var(--quiet); border-radius: 8px; background: var(--bg); color: var(--ink); }
button { font: inherit; }
.btn, form button { display: inline-block; margin-top: 12px; padding: 10px 18px; border: 2px solid var(--brand); border-radius: 8px; background: var(--brand); color: var(--bg); font-weight: 600; cursor: pointer; text-decoration: none; }
.btn.ghost { background: transparent; color: var(--brand); }
.btn[disabled] { opacity: .55; cursor: not-allowed; }
:focus-visible { outline: 3px solid var(--brand); outline-offset: 2px; }
.link { background: none; border: 0; color: var(--link); text-decoration: underline; cursor: pointer; padding: 8px; }
.card { border: 1px solid var(--line); border-radius: 10px; padding: 16px; margin-top: 16px; }
.ladder { list-style: none; padding: 0; margin: 12px 0 0; display: grid; gap: 12px; }
.ladder li { border: 1px solid var(--line); border-radius: 10px; padding: 14px 16px; }
.ladder p { margin: 2px 0; color: var(--quiet); }
.tag { display: inline-block; font-size: 13px; font-weight: 700; padding: 1px 8px; border-radius: 999px; margin-left: 6px; vertical-align: 2px; }
.tag.draft { color: var(--draft); background: var(--draftbg); } .tag.mine { color: var(--bg); background: var(--brand); }
.draftbox { border: 2px solid var(--draft); background: var(--draftbg); color: var(--ink); border-radius: 10px; padding: 10px 14px; margin: 12px 0; }
.trust { font-size: 14px; color: var(--quiet); }
.toc { list-style: none; padding: 0; margin: 8px 0; border-left: 3px solid var(--line); }
.toc button { display: block; width: 100%; background: none; border: 0; padding: 6px 12px; color: var(--link); text-decoration: underline; cursor: pointer; text-align: left; font: inherit; }
.card h2 { margin-top: 0; }
.toc button[aria-current="true"] { font-weight: 700; text-decoration: none; color: var(--ink); }
.lesson { margin-top: 8px; }
.tbl { overflow-x: auto; margin: 12px 0; }
table { border-collapse: collapse; width: 100%; font-size: 15px; }
th, td { border: 1px solid var(--line); padding: 6px 8px; text-align: left; vertical-align: top; }
th { background: var(--tint); }
.pager, .moves { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 16px; }
.err { color: var(--brand); font-weight: 600; }
.foot { border-top: 1px solid var(--line); color: var(--quiet); font-size: 14px; padding-top: 8px; padding-bottom: 24px; }
.quiet { color: var(--quiet); }
fieldset { border: 1px solid var(--line); border-radius: 10px; padding: 12px 16px; margin: 16px 0 8px; min-width: 0; }
fieldset.conf { border: 0; padding: 8px 0 0; margin: 8px 0 0; } fieldset.conf legend { font-weight: 600; padding: 0; }
legend { font-weight: 700; padding: 0 4px; }
.choice { display: flex; gap: 10px; align-items: flex-start; padding: 6px 0; }
.choice input, .cf input { width: 20px; height: 20px; margin: 3px 0 0; flex: none; }
.choice label { font-weight: 400; margin: 0; } .key { font-weight: 700; }
.cf { display: inline-flex; gap: 6px; align-items: center; margin-right: 18px; } .cf label { display: inline; font-weight: 400; margin: 0; }
textarea { max-width: 100%; display: block; }
.fb { border-radius: 10px; padding: 10px 14px; margin: 10px 0; border: 2px solid; }
.fb-ok { border-color: #1f6b3a; } .fb-bad { border-color: var(--brand); }
.objs { list-style: none; padding: 0; } .objs li { padding: 6px 0; border-top: 1px solid var(--line); }
.st { display: inline-block; font-size: 13px; font-weight: 700; padding: 1px 8px; border-radius: 999px; margin-right: 4px; }
.st-none { background: var(--tint); color: var(--quiet); } .st-ok { background: #e3f2e7; color: #1f5a33; }
.st-shaky { background: var(--draftbg); color: var(--draft); } .st-work { background: #fbe9ec; color: #8c1d2f; } .st-bad { background: #8c1d2f; color: #ffffff; }
.ai { border-left: 4px solid var(--draft); padding: 4px 12px; margin-top: 12px; }
.ailabel { font-size: 13px; font-weight: 700; color: var(--draft); margin: 0; }
.results > li { margin: 16px 0; }
blockquote { margin: 8px 0; padding: 4px 12px; border-left: 3px solid var(--line); }
details { margin: 8px 0; } summary { cursor: pointer; font-weight: 600; }
@media (prefers-color-scheme: dark) {
  .fb-ok { border-color: #7fd39a; } .st-ok { background: #183524; color: #a6e3b8; } .st-work { background: #3a1c22; color: #f0a0ac; }
  .st-bad { background: #f0a0ac; color: #111820; }
}