:root{
  /* Layout: one screen. Top = progress segments, middle = cards paged sideways (each scrolls on its own), bottom = thumb-reach nav. */
  --paper:#F1F3EE;
  --card:#FAFBF8;
  --ink:#141A22;
  --muted:#5C6570;
  --rule:#D5D9D0;
  --accent:#2340D6;
  --mark:#FFE14D;
  --font-display:"Noto Serif SC","Songti SC","STSong","SimSun",serif;
  --font-body:-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Noto Sans SC","Microsoft YaHei",sans-serif;
  --font-num:"Instrument Serif","Noto Serif SC","Songti SC",serif;
  color-scheme:light;
}
@media (prefers-color-scheme: dark){
  :root:not([data-theme="light"]){
    --paper:#0E1217; --card:#161B23; --ink:#E8EBE4; --muted:#98A1AC; --rule:#29303A; --accent:#9AABFF; --mark:#6A5800;
    color-scheme:dark;
  }
}
:root[data-theme="dark"]{
  --paper:#0E1217; --card:#161B23; --ink:#E8EBE4; --muted:#98A1AC; --rule:#29303A; --accent:#9AABFF; --mark:#6A5800;
  color-scheme:dark;
}

*{box-sizing:border-box}
html,body{height:100%;margin:0}
body{
  background:var(--paper);color:var(--ink);
  font-family:var(--font-body);font-size:17px;line-height:1.8;
  display:flex;flex-direction:column;
  -webkit-text-size-adjust:100%;-webkit-font-smoothing:antialiased;
}
button,input,textarea{font:inherit;color:inherit}
button{cursor:pointer;-webkit-tap-highlight-color:transparent}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
p,h1,h2,h3,ol,ul,dl,dd{margin:0}
ol,ul{padding:0;list-style:none}
mark{background:linear-gradient(transparent 58%,var(--mark) 58%);color:inherit;padding:0 .08em}

/* top bar */
.bar{display:flex;align-items:center;gap:14px;padding:10px 16px 8px}
.segs{flex:1;display:flex;gap:4px;min-width:0}
.segs i{flex:1;height:3px;border-radius:2px;background:var(--rule)}
.segs i.done{background:var(--ink)}
.segs i.now{background:var(--accent)}
.count{font-size:.8125rem;color:var(--muted);font-variant-numeric:tabular-nums;white-space:nowrap}
.ghost{background:none;border:1px solid var(--rule);border-radius:10px;padding:6px 12px;font-size:.875rem;line-height:1.4}
.solid{background:var(--ink);color:var(--paper);border:1px solid var(--ink);border-radius:10px;padding:6px 14px;line-height:1.4}
.solid:disabled{opacity:.4;cursor:default}

/* pager */
.track{flex:1;min-height:0;display:flex;overflow-x:auto;overflow-y:hidden;scroll-snap-type:x mandatory;scrollbar-width:none;overscroll-behavior-x:contain}
.track::-webkit-scrollbar{display:none}
.slide{flex:0 0 100%;min-width:0;scroll-snap-align:start;scroll-snap-stop:always;overflow-y:auto}
.inner{max-width:35rem;margin:0 auto;padding:14px 22px 36px;display:flex;flex-direction:column;gap:22px}

/* card pieces */
.kicker{display:flex;align-items:baseline;gap:10px;font-size:.8125rem;letter-spacing:.12em;color:var(--muted)}
.kicker .no{font-family:var(--font-num);font-style:italic;font-size:1.5rem;letter-spacing:0;color:var(--accent);line-height:1}
h1,h2.head{font-family:var(--font-display);font-weight:900;text-wrap:balance;letter-spacing:.01em}
h2.head{font-size:1.75rem;line-height:1.32}
.body{display:flex;flex-direction:column;gap:14px}
.body p{font-size:1.0625rem}

.bignum{display:flex;align-items:flex-end;gap:14px;flex-wrap:wrap}
.bn-v{font-family:var(--font-num);font-style:italic;font-size:5.25rem;line-height:.9;color:var(--accent)}
.bn-l{font-size:.9375rem;color:var(--muted);line-height:1.5;padding-bottom:6px;max-width:16em}

.bars{display:flex;flex-direction:column;gap:12px}
.unit{font-size:.8125rem;color:var(--muted);line-height:1.5}
.bar-row{display:flex;flex-direction:column;gap:2px}
.bar-lab{font-size:.9375rem;line-height:1.5}
.bar-line{display:grid;grid-template-columns:1fr auto;gap:12px;align-items:center}
.bar-track{height:14px}
.bar-fill{display:block;height:100%;min-width:3px;background:var(--muted);opacity:.45;border-radius:0 3px 3px 0}
.bar-row.top .bar-fill{background:var(--accent);opacity:1}
.bar-val{font-family:var(--font-num);font-style:italic;font-size:2.25rem;line-height:1;min-width:2.6em;text-align:right;font-variant-numeric:tabular-nums}
.bar-row.top .bar-val{color:var(--accent)}

.points{display:flex;flex-direction:column;border-top:1px solid var(--rule)}
.points li{display:grid;grid-template-columns:1.9rem 1fr;gap:8px;padding:12px 0;border-bottom:1px solid var(--rule)}
.pt-n{font-family:var(--font-num);font-style:italic;font-size:1.5rem;line-height:1.25;color:var(--accent)}
.pt-t{font-weight:600;line-height:1.5}
.pt-x{font-size:.9375rem;color:var(--muted);line-height:1.65}

details.more{border-top:1px solid var(--rule);border-bottom:1px solid var(--rule)}
details.more summary{list-style:none;display:flex;justify-content:space-between;align-items:center;padding:12px 0;font-size:.9375rem;cursor:pointer}
details.more summary::-webkit-details-marker{display:none}
details.more summary span{color:var(--muted);font-size:.8125rem}
details.more summary::after{content:"+";font-family:var(--font-num);font-size:1.5rem;line-height:1;color:var(--accent);margin-left:12px}
details.more[open] summary::after{content:"–"}
details.more summary .lbl{flex:1}
.more dl{display:flex;flex-direction:column;gap:12px;padding:2px 0 16px}
.more dt{font-size:.8125rem;color:var(--accent);line-height:1.5}
.more dd{font-size:.9375rem;line-height:1.7}

.recall{background:var(--card);border-radius:12px;padding:16px 18px;display:flex;flex-direction:column;gap:10px;align-items:flex-start}
.recall-lab{font-size:.75rem;letter-spacing:.14em;color:var(--muted)}
.recall-q{font-weight:600;line-height:1.6}
.recall-a{font-size:.9375rem;line-height:1.7;padding-top:2px}
.recall-a ol{display:flex;flex-direction:column;gap:6px;list-style:decimal;padding-left:1.3em}

.bridge{display:flex;align-items:center;gap:12px;width:100%;text-align:left;background:none;border:0;border-top:1px solid var(--rule);padding:16px 0 0;margin-top:4px}
.more:not([open]) + .bridge{border-top:0;padding-top:0;margin-top:-6px}
.bridge small{display:block;font-size:.75rem;letter-spacing:.14em;color:var(--muted);line-height:1.5}
.bridge b{display:block;font-family:var(--font-display);font-weight:600;font-size:1.0625rem;line-height:1.45}
.bridge .txt{flex:1}
.bridge .arr{font-family:var(--font-num);font-size:1.75rem;color:var(--accent);line-height:1}

/* cover */
.cover .inner{gap:20px;padding-top:22px}
.src{font-size:.8125rem;letter-spacing:.12em;color:var(--muted)}
h1{font-size:2.5rem;line-height:1.2}
.orig{font-size:.875rem;color:var(--muted);line-height:1.6;margin-top:-10px}
.orig em{font-family:var(--font-num);font-size:1.125rem}
.gist{font-size:1.1875rem;line-height:1.75}
.stats{display:flex;gap:26px;flex-wrap:wrap;border-top:1px solid var(--rule);border-bottom:1px solid var(--rule);padding:14px 0}
.stats div{display:flex;align-items:baseline;gap:6px;font-size:.875rem;color:var(--muted)}
.stats b{font-family:var(--font-num);font-style:italic;font-weight:400;font-size:2.5rem;line-height:1;color:var(--accent)}
.sub{font-size:.75rem;letter-spacing:.14em;color:var(--muted)}
.take{display:flex;flex-direction:column;gap:10px}
.take li{display:grid;grid-template-columns:1.9rem 1fr;gap:8px;line-height:1.65}
.take .pt-n{line-height:1.15}
a.out{color:var(--accent);text-underline-offset:3px;font-size:.9375rem;align-self:flex-start}
.plain{display:flex;flex-direction:column;gap:6px;font-size:.9375rem;line-height:1.65;list-style:disc;padding-left:1.2em}
.plain li::marker{color:var(--muted)}
.group{display:flex;flex-direction:column;gap:10px}

/* bottom nav */
.nav{display:flex;gap:10px;padding:10px 16px 14px;border-top:1px solid var(--rule);background:var(--paper)}
.nav button{min-height:48px;font-size:1rem}
.nav .ghost{flex:0 0 auto;padding:0 18px}
.nav .solid{flex:1}
.nav .ghost:disabled{opacity:.35;cursor:default}

/* library sheet */
.scrim{position:fixed;inset:0;background:rgba(10,14,20,.5);display:flex;align-items:flex-end;justify-content:center;z-index:10}
.scrim[hidden]{display:none}
.panel{background:var(--paper);width:100%;max-width:35rem;max-height:90%;overflow-y:auto;border-radius:16px 16px 0 0;padding:16px 20px 24px;display:flex;flex-direction:column;gap:18px}
.panel-head{display:flex;justify-content:space-between;align-items:center}
.panel h2{font-family:var(--font-display);font-weight:900;font-size:1.375rem}
.panel h3{font-family:var(--font-display);font-weight:600;font-size:1.0625rem}
.lib{display:flex;flex-direction:column;border-top:1px solid var(--rule)}
.lib li{display:flex;align-items:center;gap:8px;border-bottom:1px solid var(--rule)}
.lib-item{flex:1;min-width:0;text-align:left;background:none;border:0;padding:12px 0;display:flex;flex-direction:column;gap:2px}
.lib-item b{font-weight:600;line-height:1.5;overflow-wrap:anywhere}
.lib-item span{font-size:.8125rem;color:var(--muted);line-height:1.5}
.lib-item .on{color:var(--accent)}
.lib .del{font-size:.8125rem;padding:4px 10px;flex:0 0 auto}
.gen{display:flex;flex-direction:column;gap:10px}
.hint{font-size:.875rem;color:var(--muted);line-height:1.65}
.gen label{font-size:.8125rem;color:var(--muted);line-height:1.5;margin-top:4px}
.gen textarea,.gen input{width:100%;background:var(--card);border:1px solid var(--rule);border-radius:10px;padding:10px 12px;font-size:1rem;line-height:1.6}
.gen textarea{resize:vertical;min-height:7.5rem}
.gen-row{display:flex;gap:10px;margin-top:4px}
.gen-row button{min-height:46px;font-size:1rem}
.gen-row .solid{flex:1}
.status{font-size:.875rem;line-height:1.6;color:var(--muted);min-height:1.4em}
.status.err{color:var(--ink)}

@media (min-width:700px){
  .inner{padding-top:28px}
  h1{font-size:3rem}
  h2.head{font-size:2rem}
  .scrim{align-items:center}
  .panel{border-radius:16px}
}
@media (prefers-reduced-motion:no-preference){
  .segs i{transition:background .25s}
}

/* ---- 云端文库版新增 ---- */
.bar{padding-top:calc(10px + env(safe-area-inset-top))}
.nav{padding-bottom:calc(14px + env(safe-area-inset-bottom))}
.panel{padding-bottom:calc(24px + env(safe-area-inset-bottom))}
#shelf{display:flex;flex-direction:column;gap:18px}
#shelf[hidden]{display:none}
.gen[hidden]{display:none}
.lib-item:disabled{cursor:default;color:inherit}
.lib-item .wait{color:var(--accent)}
.lib-item .bad{color:var(--ink)}
.lib-item .new{color:var(--accent);font-weight:600}
.lib .act{font-size:.8125rem;padding:4px 10px;flex:0 0 auto}
.lib-empty{padding:14px 0;font-size:.9375rem;color:var(--muted);border-bottom:1px solid var(--rule)}
details.paste summary{font-size:.875rem;color:var(--accent);cursor:pointer;padding:4px 0}
details.paste{display:flex;flex-direction:column;gap:6px}
details.paste label{display:block;margin:6px 0 4px}
#sign-out{align-self:flex-start;font-size:.8125rem;color:var(--muted)}