:root {
  --bg: #f7f6f2; --panel: #ffffff; --ink: #1d1d1b; --muted: #6b6a64; --line: #e4e2da;
  --accent: #a8431f; --accent-soft: #f6e4dc; --on-accent: #ffffff; --code: #f1efe8; --side-w: 270px;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #161614; --panel: #1f1f1c; --ink: #ecebe6; --muted: #a09e96; --line: #33322e;
    --accent: #e3825c; --accent-soft: #3a2a22; --on-accent: #1d1d1b; --code: #2a2926;
    color-scheme: dark;
  }
}
* { box-sizing: border-box; }
html, body { margin: 0; }
body { background: var(--bg); color: var(--ink); font: 16px/1.65 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; }
a { color: var(--accent); }
[hidden] { display: none !important; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
button { font: inherit; cursor: pointer; border: 0; border-radius: 8px; padding: .6rem 1rem; background: var(--accent); color: var(--on-accent); }
button:disabled { opacity: .6; cursor: wait; }
button.ghost { background: transparent; color: var(--muted); border: 1px solid var(--line); padding: .35rem .8rem; }
.mark { display: inline-grid; place-items: center; width: 1.8rem; height: 1.8rem; border-radius: 7px; background: var(--accent); color: var(--on-accent); font-weight: 700; margin-right: .4rem; }
.brand { font-weight: 700; font-size: 1.15rem; color: var(--ink); text-decoration: none; display: inline-flex; align-items: center; }

/* login */
.login { min-height: 100vh; display: grid; place-items: center; padding: 16px; }
.card { width: 100%; max-width: 360px; background: var(--panel); border: 1px solid var(--line); border-radius: 14px; padding: 2rem 1.6rem; display: grid; gap: .9rem; }
.card .sub { margin: -.4rem 0 .4rem; color: var(--muted); font-size: .9rem; }
.card label { display: grid; gap: .3rem; font-size: .9rem; color: var(--muted); }
.card input { font: inherit; padding: .6rem .7rem; border: 1px solid var(--line); border-radius: 8px; background: var(--bg); color: var(--ink); }
.card input:focus { outline: 2px solid var(--accent); outline-offset: 1px; }
.msg { margin: 0; min-height: 1.4em; color: var(--accent); font-size: .9rem; }

/* app */
.top { position: sticky; top: 0; z-index: 3; height: 56px; display: flex; align-items: center; gap: 1rem; padding: 0 16px; background: var(--panel); border-bottom: 1px solid var(--line); }
.top .who { margin-left: auto; color: var(--muted); font-size: .9rem; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.menu { display: none; background: transparent; color: var(--ink); padding: .2rem .5rem; font-size: 1.3rem; }
.side { position: fixed; top: 56px; bottom: 0; left: 0; width: var(--side-w); overflow-y: auto; padding: 1rem .8rem 2rem; border-right: 1px solid var(--line); background: var(--panel); }
.side .group { margin: 1.2rem .6rem .3rem; font-size: .75rem; letter-spacing: .08em; text-transform: uppercase; color: var(--muted); font-weight: 600; }
.side .group:first-child { margin-top: 0; }
.side a { display: block; padding: .35rem .6rem; border-radius: 7px; color: var(--ink); text-decoration: none; font-size: .95rem; }
.side a:hover { background: var(--bg); }
.side a.on { background: var(--accent-soft); color: var(--accent); font-weight: 600; }
.main { margin-left: var(--side-w); padding: 2.5rem 16px 4rem; }
.page, .pager { max-width: 760px; margin: 0 auto; }

/* reading */
.page .crumb { margin: 0; color: var(--accent); font-size: .8rem; font-weight: 600; letter-spacing: .06em; text-transform: uppercase; }
.page h1 { font-size: 2rem; line-height: 1.2; margin: .3rem 0 1.2rem; }
.page h1:focus { outline: none; }
.page h2 { font-size: 1.3rem; margin: 2.2rem 0 .6rem; padding-top: .6rem; border-top: 1px solid var(--line); }
.page h3 { font-size: 1.05rem; margin: 1.6rem 0 .4rem; }
.page .lead { font-size: 1.12rem; color: var(--muted); }
.page code { background: var(--code); padding: .1em .35em; border-radius: 4px; font-size: .9em; }
.page pre { background: var(--code); padding: 1rem; border-radius: 10px; overflow-x: auto; font-size: .85rem; line-height: 1.5; }
.page pre code { background: none; padding: 0; }
.page table { width: 100%; border-collapse: collapse; margin: 1rem 0; font-size: .93rem; }
.page th, .page td { text-align: left; padding: .5rem .6rem; border-bottom: 1px solid var(--line); vertical-align: top; }
.page th { color: var(--muted); font-weight: 600; font-size: .85rem; }
.page blockquote, .page .note { margin: 1.2rem 0; padding: .8rem 1rem; border-left: 3px solid var(--accent); background: var(--accent-soft); border-radius: 0 8px 8px 0; }
.page .note p { margin: .3rem 0; }
.page .grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: .8rem; margin: 1rem 0; }
.page .tile { border: 1px solid var(--line); border-radius: 10px; padding: .8rem 1rem; background: var(--panel); }
.page .tile b { display: block; margin-bottom: .2rem; }
.page .do, .page .dont { list-style: none; padding-left: 0; }
.page .do li, .page .dont li { position: relative; padding-left: 1.5rem; }
.page .do li::before, .page .dont li::before { position: absolute; left: 0; }
.page .do li::before { content: "✓"; color: #3d8b4f; }
.page .dont li::before { content: "✗"; color: var(--accent); }
.page .flow { display: flex; flex-wrap: wrap; align-items: center; gap: .4rem; margin: 1rem 0; font-size: .88rem; }
.page .flow span { padding: .4rem .7rem; border: 1px solid var(--line); border-radius: 8px; background: var(--panel); }
.page .flow i { font-style: normal; color: var(--muted); }
.page .hint { color: var(--muted); font-size: .9rem; }
.pager { display: flex; justify-content: space-between; gap: 1rem; margin-top: 3rem; padding-top: 1.2rem; border-top: 1px solid var(--line); }
.pager a { display: grid; text-decoration: none; color: var(--ink); font-weight: 600; max-width: 48%; }
.pager a.next { text-align: right; margin-left: auto; }
.pager small { color: var(--muted); font-weight: 400; font-size: .8rem; }
.status { position: fixed; bottom: 16px; left: 50%; transform: translateX(-50%); margin: 0; padding: .6rem 1rem; border-radius: 8px; background: var(--ink); color: var(--bg); font-size: .9rem; max-width: calc(100% - 32px); }

@media (max-width: 860px) {
  .menu { display: inline-block; }
  .side { transform: translateX(-100%); visibility: hidden; transition: transform .2s, visibility .2s; z-index: 2; box-shadow: 0 0 30px rgba(0,0,0,.15); }
  .nav-open .side { transform: none; visibility: visible; }
  .page table { display: block; overflow-x: auto; }
  .main { margin-left: 0; padding-top: 1.6rem; }
  .page h1 { font-size: 1.6rem; }
}