/* Knownstep Stories -- a reading-room library: cool paper, banker's-lamp green, brass */
:root {
  --ground: #eef0ec; --surface: #f8f9f6; --ink: #1c2527; --muted: #5b6664; --line: #d5dad2;
  --accent: #245e52; --accent-ink: #f4f1e6; --brass: #9c6f25; --shadow: 0 1px 2px rgba(28,37,39,.08), 0 8px 24px rgba(28,37,39,.08);
  --adult: #8a3b2e; --display: "IM Fell English", "Iowan Old Style", Georgia, serif; --sc: "IM Fell English SC", Georgia, serif;
  --body: "Libre Caslon Text", Baskerville, Georgia, serif; --ui: "Work Sans", system-ui, -apple-system, "Segoe UI", sans-serif;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) { --ground: #121615; --surface: #1a1f1e; --ink: #e6eae5; --muted: #9ba49f; --line: #2b3331;
    --accent: #6db19f; --accent-ink: #0f1614; --brass: #d3a659; --adult: #e08a78; --shadow: 0 1px 2px rgba(0,0,0,.4), 0 8px 24px rgba(0,0,0,.35); color-scheme: dark; }
}
:root[data-theme="dark"] { --ground: #121615; --surface: #1a1f1e; --ink: #e6eae5; --muted: #9ba49f; --line: #2b3331;
  --accent: #6db19f; --accent-ink: #0f1614; --brass: #d3a659; --adult: #e08a78; --shadow: 0 1px 2px rgba(0,0,0,.4), 0 8px 24px rgba(0,0,0,.35); color-scheme: dark; }

* { box-sizing: border-box; }
[hidden] { display: none !important; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--ground); color: var(--ink); font: 17px/1.6 var(--body);
  padding: env(safe-area-inset-top, 0px) 0 env(safe-area-inset-bottom, 0px); }
a { color: inherit; }
img { max-width: 100%; display: block; }
main { min-width: 0; max-width: 1180px; margin: 0 auto; padding-inline: 20px; padding-block: 8px 48px; }
:focus-visible { outline: 2px solid var(--brass); outline-offset: 3px; border-radius: 3px; }

/* header */
.top { display: flex; min-width: 0; align-items: center; gap: 24px; max-width: 1180px; margin: 0 auto; padding: 18px 20px; flex-wrap: wrap; }
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; font: 22px var(--display); letter-spacing: .01em; }
.brand em { font-style: italic; color: var(--accent); }
.mark { width: 26px; height: 26px; border-radius: 6px; background: var(--accent) url(/favicon.svg) center / cover; }
.nav { display: flex; gap: 18px; flex-wrap: wrap; flex: 1; font: 500 14px var(--ui); }
.nav a { text-decoration: none; color: var(--muted); padding: 4px 0; border-bottom: 2px solid transparent; }
.nav a:hover { color: var(--ink); border-bottom-color: var(--brass); }
.acct { font: 600 14px var(--ui); text-decoration: none; padding: 8px 14px; border: 1px solid var(--line); border-radius: 999px; background: var(--surface); }
.acct:hover { border-color: var(--accent); }

/* intro */
.intro { padding-block: 28px 12px; max-width: 46rem; }
.intro h1 { font: 400 clamp(34px, 5vw, 54px)/1.05 var(--display); margin: 0 0 12px; text-wrap: balance; }
.intro p { color: var(--muted); margin: 0; font-size: 18px; }

/* shelves and cards */
.shelf { margin-top: 38px; }
.shelf-h { display: flex; align-items: baseline; justify-content: space-between; border-bottom: 1px solid var(--line); margin-bottom: 18px; padding-bottom: 6px; }
.shelf h2, .book h2, .cat h1 { font: 400 26px var(--display); margin: 0; }
.more { font: 500 14px var(--ui); color: var(--accent); text-decoration: none; }
.row, .grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(170px, 1fr)); gap: 28px 22px; }
.card { display: flex; flex-direction: column; gap: 4px; text-decoration: none; }
.cov { position: relative; aspect-ratio: 3 / 4; border-radius: 4px; overflow: hidden; background: var(--surface); box-shadow: var(--shadow); }
.cov img { width: 100%; height: 100%; object-fit: cover; transition: transform .35s ease; }
.card:hover .cov img { transform: scale(1.03); }
.prog { position: absolute; left: 0; right: 0; bottom: 0; height: 5px; background: rgba(0,0,0,.35); }
.prog span { display: block; height: 100%; background: var(--brass); }
.ttl { font: 400 19px/1.2 var(--display); margin-top: 8px; text-wrap: balance; }
.auth { font: 14px var(--ui); color: var(--muted); }
.meta { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 4px; }
.sub { font: 13px var(--ui); color: var(--muted); font-variant-numeric: tabular-nums; }
.tag, .age { font: 500 12px var(--ui); letter-spacing: .02em; padding: 2px 8px; border-radius: 999px; border: 1px solid var(--line); color: var(--muted); text-decoration: none; }
a.tag:hover { border-color: var(--accent); color: var(--ink); }
.age.older { border-color: var(--adult); color: var(--adult); }
.chips { display: flex; flex-wrap: wrap; gap: 10px; }
.chip { font: 500 15px var(--ui); text-decoration: none; padding: 10px 16px; border: 1px solid var(--line); border-radius: 8px; background: var(--surface); }
.chip span { color: var(--muted); margin-left: 6px; font-variant-numeric: tabular-nums; }
.chip:hover { border-color: var(--accent); }
.empty { color: var(--muted); }

/* category + crumbs */
.cat h1 { font-size: clamp(30px, 4vw, 42px); margin: 6px 0 24px; }
.cat-about { max-width: 42rem; margin-top: 44px; }
.cat-about h2 { font: 400 26px var(--display); margin: 0 0 10px; }
.cat-about p { margin: 0 0 14px; }
.crumb { margin: 18px 0 0; font: 14px var(--ui); }
.crumb a { color: var(--muted); text-decoration: none; }
.crumb a::before { content: "\2190\00a0"; }

/* book page */
.book-g { display: grid; grid-template-columns: minmax(200px, 340px) 1fr; gap: 44px; margin-top: 18px; align-items: start; }
.book-cov { width: 100%; height: auto; aspect-ratio: 3 / 4; object-fit: cover; border-radius: 5px; box-shadow: var(--shadow); }
.book h1 { font: 400 clamp(34px, 4.6vw, 52px)/1.05 var(--display); margin: 0 0 8px; text-wrap: balance; }
.by { font: 16px var(--ui); color: var(--muted); margin: 0 0 14px; }
.tags { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 18px; }
.blurb { font-size: 19px; max-width: 38rem; margin: 0 0 16px; }
.note { font: 14px var(--ui); color: var(--muted); margin: 0 0 16px; max-width: 40rem; }
.note.older, .blocked { color: var(--adult); }
.blocked { font: 600 15px var(--ui); margin: 8px 0; }
.subt { font: italic 18px var(--body); color: var(--muted); margin: -2px 0 10px; }
.acts { display: flex; flex-wrap: wrap; align-items: center; gap: 12px 14px; margin: 22px 0 8px; }
.btn { font: 600 15px var(--ui); padding: 12px 20px; border-radius: 999px; border: 1px solid var(--line); background: var(--surface); color: var(--ink); cursor: pointer; text-decoration: none; }
.btn:hover { border-color: var(--accent); }
.btn.primary { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); }
.btn.primary:hover { filter: brightness(1.08); }
.btn-note { flex-basis: 100%; font: 13px var(--ui); color: var(--muted); margin-top: -4px; }
.fav[aria-pressed="true"] { color: var(--brass); border-color: var(--brass); }
.progress-line { display: flex; align-items: center; gap: 12px; font: 14px var(--ui); color: var(--muted); margin: 6px 0; }
.progress-line .bar { width: 180px; height: 6px; border-radius: 3px; background: var(--line); overflow: hidden; }
.progress-line .bar span { display: block; height: 100%; background: var(--brass); }
.book h2 { margin-top: 30px; font-size: 22px; }
.toc, .dl { padding: 0; margin: 10px 0 0; list-style: none; }
.toc li, .dl li { display: flex; justify-content: space-between; gap: 12px; padding: 9px 0; border-top: 1px solid var(--line); font: 15px var(--ui); }
.toc span { color: var(--muted); font-variant-numeric: tabular-nums; }
.dl a, .toc a { color: var(--accent); text-decoration: none; }
.dl a:hover, .toc a:hover { text-decoration: underline; }

/* account extras */
.col { display: flex; flex-direction: column; gap: 24px; }
.ages { border: 0; padding: 0; margin: 4px 0 8px; display: flex; flex-wrap: wrap; gap: 8px; }
.ages legend { font: 500 14px var(--ui); margin-bottom: 8px; padding: 0; }
.ages label { margin: 0; font: 500 15px var(--ui); padding: 8px 12px; border: 1px solid var(--line); border-radius: 8px; cursor: pointer; background: var(--ground); }
.ages input { accent-color: var(--accent); margin-right: 6px; }
.ages label:has(input:checked) { border-color: var(--accent); }
.notice { border-left: 3px solid var(--brass); padding: 4px 0 4px 14px; font: 15px var(--ui); }
#signup-rest { display: flex; flex-direction: column; gap: 8px; }
.box select { font: 16px var(--ui); padding: 10px; border-radius: 8px; border: 1px solid var(--line); background: var(--ground); color: var(--ink); }
.code { max-width: 36rem; margin-top: 20px; }
.thecode { font: 600 clamp(22px, 4vw, 30px)/1.2 ui-monospace, "SF Mono", Menlo, monospace; letter-spacing: .08em; margin: 8px 0;
  padding: 14px; border: 1px dashed var(--brass); border-radius: 8px; text-align: center; user-select: all; }
.danger .btn { border-color: var(--adult); color: var(--adult); }
.settings .forms { margin-top: 4px; }

.opt { font-weight: 400; color: var(--muted); }
.flash { font: 15px var(--ui); padding: 10px 14px; border-radius: 8px; border: 1px solid var(--accent); max-width: 40rem; }
.btnrow { display: flex; flex-wrap: wrap; align-items: center; gap: 12px 16px; margin-top: 10px; }
.btnrow .btn { margin-top: 0; }
.ok { color: var(--accent); }

/* prose pages */
.prose { max-width: 44rem; }
.prose h1 { font: 400 clamp(32px, 4.4vw, 46px)/1.1 var(--display); margin: 10px 0 18px; }
.prose h2 { font: 400 24px var(--display); margin: 30px 0 6px; }
.prose li { margin: 6px 0; }
.prose a { color: var(--accent); }
.foot .links { display: flex; flex-wrap: wrap; gap: 16px; margin-top: 8px; }

/* install app */
.install-btn { font: 500 14px var(--ui); color: var(--accent); background: none; border: 1px solid var(--accent); border-radius: 999px;
  padding: 6px 12px; cursor: pointer; }
.install-btn:hover { background: var(--accent); color: var(--accent-ink); }
.ios-hint { position: fixed; left: 12px; right: 12px; bottom: calc(12px + env(safe-area-inset-bottom, 0px)); z-index: 20;
  display: flex; align-items: center; gap: 12px; background: var(--surface); border: 1px solid var(--line); border-radius: 12px;
  padding: 12px 14px; box-shadow: var(--shadow); font: 14px var(--ui); max-width: 520px; margin: 0 auto; }
.ios-hint p { margin: 0; flex: 1; }
.ios-hint .share { display: inline-flex; vertical-align: -3px; color: var(--accent); }
.ios-hint .linklike { flex: none; }

/* support */
.support-link { font: 500 14px var(--ui); color: var(--brass); text-decoration: none; }
.support-link:hover { text-decoration: underline; }
.support h1 { font: 400 clamp(32px, 4.4vw, 46px)/1.1 var(--display); margin: 10px 0 8px; }
.support-g { display: grid; grid-template-columns: 1.3fr 1fr; gap: 24px; align-items: start; }
.facts { margin: 0; padding-left: 1.1em; display: grid; gap: 10px; }
.facts li { font-size: 16px; }
.give .btn { align-self: stretch; text-align: center; }
.btn.soon { opacity: .55; cursor: default; }
.give-img { width: 100%; max-width: 220px; height: auto; border-radius: 8px; align-self: center; margin-bottom: 6px; }
.thanks { display: flex; gap: 18px; align-items: center; margin: 18px 0 6px; padding: 16px 18px; border: 1px solid var(--brass);
  border-radius: 10px; background: var(--surface); max-width: 44rem; }
.thanks img { width: 96px; height: 96px; border-radius: 8px; flex: none; }
.thanks h2 { font: 400 26px var(--display); margin: 0 0 4px; }
.thanks p { margin: 0; font: 15px var(--ui); color: var(--muted); }
.btn.soon small { font-weight: 500; }
.foot a { color: inherit; }

/* book page: characters */
.cast { margin-top: 30px; }
.cgrid { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 16px 14px; margin-top: 12px; }
.ccard { margin: 0; background: var(--surface); border: 1px solid var(--line); border-radius: 6px; overflow: hidden; }
.ccard img { width: 100%; height: auto; aspect-ratio: 3 / 4; object-fit: cover; display: block; border-bottom: 1px solid var(--line); }
.ccard figcaption { padding: 8px 10px 11px; }
.ccard h3 { margin: 0 0 3px; font: 400 17px/1.2 var(--display); }
.ccard p { margin: 0; font: 13px/1.45 var(--ui); color: var(--muted); }
.ccard h3 .zh { font-family: "Noto Serif SC", "Songti SC", "STSong", serif; font-size: 15px; color: var(--muted); white-space: nowrap; }
.cast:not(.open) .ccard[data-more] { display: none; }
.cast.open #cast-more { display: none; }
#cast-more { margin-top: 12px; }
@media (max-width: 1000px) { .cgrid { grid-template-columns: repeat(3, minmax(0, 1fr)); } }
@media (max-width: 760px) { .cgrid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; } }

/* book page: about the story + questions */
.about-story { margin-top: 30px; max-width: 42rem; }
.about-story p { margin: 0 0 12px; }
.about-story .edition, .about-story .source { font: 14px/1.55 var(--ui); color: var(--muted); }
.faq details { border-top: 1px solid var(--line); padding: 10px 0; }
.faq details:last-child { border-bottom: 1px solid var(--line); }
.faq summary { cursor: pointer; font: 500 15px var(--ui); list-style-position: outside; }
.faq details p { margin: 8px 0 2px; font-size: 16px; color: var(--muted); }

/* text version + more like this */
.textver { margin-top: 26px; font: 15px var(--ui); }
.textver a { color: var(--accent); font-weight: 600; }
.textver-page { max-width: 46rem; }
.textver-page h1 { font: 400 clamp(32px, 4.4vw, 46px)/1.1 var(--display); margin: 10px 0 6px; }
.textver-page h2 { font: 400 26px var(--display); margin: 40px 0 10px; }
.textver-page .lede a { color: var(--accent); }
.tpage { margin: 0 0 26px; }
.tpage img { width: 100%; height: auto; border-radius: 4px; box-shadow: var(--shadow); }
.tpage figcaption { margin-top: 10px; font-size: 18px; line-height: 1.6; }
.tpage .pno { font: 600 12px var(--ui); color: var(--muted); margin-right: 10px; letter-spacing: .06em; }
.tpage .zh { display: block; margin-top: 6px; font-family: "Noto Serif SC", "Songti SC", "STSong", serif; color: var(--muted); }
.textver-page .source { font: 14px var(--ui); color: var(--muted); margin-top: 30px; }
.more-like { margin-top: 50px; }

/* account */
.account h1, .account h2.greet { font: 400 clamp(32px, 4.4vw, 46px)/1.1 var(--display); margin: 10px 0 8px; }
.lede { color: var(--muted); margin: 0 0 26px; max-width: 40rem; }
.forms { display: grid; grid-template-columns: 1fr 1.25fr; gap: 24px; align-items: start; }
.box { background: var(--surface); border: 1px solid var(--line); border-radius: 10px; padding: 22px; display: flex; flex-direction: column; gap: 8px; }
.box h2 { font: 400 24px var(--display); margin: 0 0 6px; }
.box label { font: 500 14px var(--ui); margin-top: 6px; }
.box input { font: 16px var(--ui); padding: 11px 12px; border-radius: 8px; border: 1px solid var(--line); background: var(--ground); color: var(--ink); }
.box input:focus { outline: 2px solid var(--accent); outline-offset: 0; border-color: transparent; }
.box .btn { align-self: flex-start; margin-top: 10px; }
.hint { font: 13px var(--ui); color: var(--muted); margin: 0; }
.err { font: 14px var(--ui); color: var(--adult); margin: 0; min-height: 1.2em; }
.handles { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 4px; }
.handles label { margin: 0; font: 500 15px var(--ui); padding: 8px 12px; border: 1px solid var(--line); border-radius: 8px; cursor: pointer; background: var(--ground); }
.handles input { position: absolute; opacity: 0; pointer-events: none; }
.handles label:has(input:checked) { border-color: var(--accent); background: var(--accent); color: var(--accent-ink); }
.handles label:has(input:focus-visible) { outline: 2px solid var(--brass); outline-offset: 2px; }
.linklike { align-self: flex-start; background: none; border: 0; padding: 2px 0; font: 500 14px var(--ui); color: var(--accent); cursor: pointer; }
#logout { margin-top: 34px; }

.foot { max-width: 1180px; margin: 0 auto; padding: 26px 20px 40px; border-top: 1px solid var(--line); font: 13px var(--ui); color: var(--muted); }

@media (max-width: 760px) {
  .top { gap: 12px 18px; }
  .nav { order: 3; flex-basis: 100%; min-width: 0; max-width: 100%; gap: 14px; overflow-x: auto; flex-wrap: nowrap; white-space: nowrap; padding-bottom: 4px; scrollbar-width: none; }
  .acct { margin-left: auto; }
  .book-g { grid-template-columns: 1fr; gap: 22px; }
  .book-cov { max-width: 260px; }
  .forms, .support-g { grid-template-columns: 1fr; }
  .row, .grid { grid-template-columns: repeat(auto-fill, minmax(140px, 1fr)); gap: 22px 16px; }
}
@media (prefers-reduced-motion: reduce) { .cov img { transition: none; } }