/* Library, reader, tests, badges, offline sync */
.lhero{display:flex;gap:18px;align-items:flex-end;justify-content:space-between;flex-wrap:wrap}
.lhero>div{max-width:640px;display:flex;flex-direction:column;gap:6px}
.lhero p{margin:0}
#libQ{flex:1;min-width:240px;max-width:420px;border:1.5px solid var(--line);border-radius:999px;padding:11px 18px;font-size:16px;background:var(--surface);color:var(--ink)}
.lfilters{display:flex;gap:10px;align-items:center;flex-wrap:wrap;margin-top:6px}
.lfilters .sp{flex:1}
.lfilters select{border:1px solid var(--line);border-radius:999px;padding:7px 12px;background:var(--surface);color:var(--ink);font-size:14px}
.lgrid{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:16px}
.lcard{display:flex;flex-direction:column;background:var(--surface);border:1px solid var(--line);border-radius:16px;overflow:hidden;text-decoration:none;color:inherit;transition:transform .15s,box-shadow .15s}
.lcard:hover{transform:translateY(-2px);box-shadow:0 10px 26px rgba(0,0,0,.08)}
.lcov{display:block;aspect-ratio:16/8;position:relative}
.lkind{position:absolute;left:10px;top:10px;background:rgba(255,255,255,.92);color:#17201c;font-size:11.5px;font-weight:700;border-radius:999px;padding:2px 10px}
.lkind.k-guide{background:#1f4a3f;color:#fff}.lkind.k-pdf{background:#a3471d;color:#fff}.lkind.k-infographic{background:#3d6e8f;color:#fff}
.lpdf{position:absolute;right:14px;bottom:10px;font-family:var(--display);font-weight:800;font-size:1.6rem;color:rgba(255,255,255,.85);letter-spacing:.04em}
.lcb{display:flex;flex-direction:column;gap:6px;padding:14px 16px 16px}
.lcb b{font-size:1.05rem;line-height:1.3}
.lsum{color:var(--muted);font-size:14px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.lmeta{font-family:var(--mono);font-size:12px;color:var(--muted)}
.lmeta .ok{color:var(--good,#2f7a4a)}.lmeta .warn{color:var(--alert)}
.lmore{display:flex;justify-content:center;margin-top:14px}
/* reader */
.lback{font-weight:650;text-decoration:none;color:var(--muted);font-size:14px}
.lhead{display:flex;flex-direction:column;gap:10px;max-width:820px;margin-top:10px}
.lhead h1{font-family:var(--display);font-stretch:108%;font-weight:800;font-size:clamp(1.9rem,4.4vw,3rem);line-height:1.05;margin:0}
.llead{font-size:1.15rem;color:var(--muted);margin:0;max-width:68ch}
.lacts{display:flex;gap:8px;flex-wrap:wrap}
.lacts [aria-pressed=true]{border-color:var(--good,#2f7a4a);color:var(--good,#2f7a4a)}
.llayout{display:grid;grid-template-columns:minmax(0,1fr);gap:32px;margin-top:22px}
.llayout.hastoc{grid-template-columns:220px minmax(0,1fr)}
.ltoc{position:sticky;top:16px;align-self:start;display:flex;flex-direction:column;gap:4px;font-size:14px;border-left:2px solid var(--line);padding-left:12px;max-height:calc(100vh - 40px);overflow:auto}
.ltoc b{font-family:var(--mono);font-size:11px;letter-spacing:.1em;text-transform:uppercase;color:var(--muted);margin-bottom:4px}
.ltoc a{color:var(--ink);text-decoration:none;padding:3px 0}.ltoc a:hover{color:var(--spruce,#1f5a46)}.ltoc a.l3{padding-left:12px;font-size:13px;color:var(--muted)}
.lbody{max-width:72ch;font-size:17px;line-height:1.7;display:flex;flex-direction:column;gap:2px}
.lbody p{margin:0 0 14px}
.lbody h2{font-family:var(--display);font-stretch:105%;font-weight:800;font-size:1.6rem;margin:22px 0 8px;scroll-margin-top:16px;text-transform:none;border:0;padding:0;color:inherit}
.lbody h3{font-size:1.25rem;margin:18px 0 6px;scroll-margin-top:16px}.lbody h4{font-size:1.05rem;margin:14px 0 4px}
.lbody ul,.lbody ol{margin:0 0 14px;padding-left:22px}.lbody li{margin:3px 0}
.lbody a{color:var(--spruce,#1f5a46)}
.lchk{list-style:none;padding-left:0!important}.lchk li{display:flex;gap:8px}.lchk .box{font-size:1.1em}
.lfig{margin:8px 0 18px;display:flex;flex-direction:column;gap:6px}.lfig img{border-radius:12px;width:100%;height:auto}.lfig.border img{border:1px solid var(--line)}
.lfig figcaption,.linfo figcaption{font-size:14px;color:var(--muted)}
.lvid{position:relative;aspect-ratio:16/9;border-radius:12px;overflow:hidden;background:#000}.lvid iframe{position:absolute;inset:0;width:100%;height:100%;border:0}
.ltable{overflow:auto;margin:6px 0 18px}.ltable table{border-collapse:collapse;width:100%;font-size:15px}.ltable td,.ltable th{border:1px solid var(--line);padding:8px 10px;text-align:left;vertical-align:top}.ltable th{background:var(--sunk)}
.lquote{margin:6px 0 18px;padding:6px 0 6px 18px;border-left:4px solid var(--alert);font-size:1.15rem}.lquote p{margin:0}.lquote cite{display:block;font-size:14px;color:var(--muted);font-style:normal;margin-top:4px}
.lcall{border-radius:12px;padding:12px 14px;margin:6px 0 18px;font-size:16px;background:var(--spruce-soft,#e2eee8);border-left:4px solid var(--spruce,#1f5a46)}
.lcall.warn{background:color-mix(in srgb,var(--alert) 12%,transparent);border-left-color:var(--alert)}
.lcall b{display:block;margin-bottom:2px}
.ldelim{border:0;text-align:center;margin:10px 0 20px}.ldelim::before{content:"* * *";color:var(--muted);letter-spacing:.4em}
.lbox{background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:16px;margin:4px 0 18px;display:flex;flex-direction:column;gap:10px;font-size:15px}
.lbox.pass{border-color:var(--good,#2f7a4a)}
.lbox .row,.lcourse .row,.lgate .row{display:flex;gap:8px;flex-wrap:wrap;align-items:center}
.lpdf-view{width:100%;height:78vh;border:1px solid var(--line);border-radius:10px;background:#fff}
.linfo{margin:0 0 18px}.linfo img{width:100%;border-radius:12px;border:1px solid var(--line);cursor:zoom-in}
.lcourse{border:1.5px solid var(--ink);border-radius:14px;padding:14px 16px;margin:14px 0;display:flex;flex-direction:column;gap:6px;font-size:15px;line-height:1.5}
.lcourse b{font-size:1.1rem}.lcourse p{margin:0}
.lend{display:flex;gap:8px;flex-wrap:wrap;border-top:1px solid var(--line);padding-top:16px;margin-top:10px}
.lrel{margin-top:28px;display:flex;flex-direction:column;gap:12px}.lrel h3{margin:0}
.lpop{display:flex;flex-direction:column;gap:12px;align-items:flex-start}.lpop p{margin:0}
.lpop-b{font-size:2.6rem;line-height:1}
.lnudge{position:fixed;left:50%;transform:translateX(-50%);bottom:calc(16px + env(safe-area-inset-bottom,0px));z-index:45;background:var(--surface);color:var(--ink);border:1px solid var(--line);box-shadow:0 14px 36px rgba(0,0,0,.25);border-radius:16px;padding:10px 10px 10px 16px;display:flex;gap:10px;align-items:center;max-width:min(560px,calc(100vw - 24px));font-size:14px}
.lnudge .x{border:0;background:var(--sunk);border-radius:50%;width:30px;height:30px;cursor:pointer;color:var(--ink);flex:none}
.lbadges{display:flex;gap:8px;flex-wrap:wrap}.lbadge{background:color-mix(in srgb,#d4a919 22%,var(--surface));border:1px solid color-mix(in srgb,#d4a919 50%,var(--line));border-radius:999px;padding:5px 12px;font-weight:650;font-size:13.5px}
.ss-badge{margin-right:4px}
.lgate{max-width:680px;display:flex;flex-direction:column;gap:14px;padding:20px 0}
.exam{display:flex;flex-direction:column;gap:16px;max-width:760px;margin-top:16px}
.exam .qq{background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:14px 16px;display:flex;flex-direction:column;gap:8px}
.exam .qq label{display:flex;gap:8px;align-items:flex-start;padding:6px 8px;border-radius:8px;cursor:pointer}
.exam .qq label.right{background:color-mix(in srgb,var(--good,#2f7a4a) 15%,transparent)}.exam .qq label.wrong{background:color-mix(in srgb,var(--alert) 15%,transparent)}
.exam .exp{margin:0;font-size:14.5px}
.exam .row{display:flex;gap:10px;align-items:center;flex-wrap:wrap}
#examRes{max-width:760px;margin-top:16px}
#examBox{display:flex;flex-direction:column;gap:6px;padding-bottom:40px}
/* community extras */
.chipsep{width:1px;align-self:stretch;background:var(--line);margin:0 4px}
.qlib{margin-left:auto;display:inline-flex;gap:6px;align-items:center;font-size:12.5px;font-weight:650;color:var(--muted);border:1px dashed var(--line);border-radius:999px;padding:2px 10px;cursor:pointer}
.ss-guest{display:flex;gap:8px;flex:none}
@media (max-width:720px){.ss-guest .btn:first-child{display:none}}
/* offline sync page */
.sync-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(320px,1fr));gap:16px;align-items:start}
.sync-step{display:flex;flex-direction:column;gap:10px}
.sync-bar{height:10px;background:var(--sunk);border-radius:99px;overflow:hidden}.sync-bar i{display:block;height:100%;width:0;background:var(--spruce,#1f5a46);transition:width .2s}
.sync-log{font-family:var(--mono);font-size:12px;color:var(--muted);max-height:150px;overflow:auto;white-space:pre-wrap}
.pk-row{display:flex;gap:8px;align-items:baseline;justify-content:space-between;border-bottom:1px solid var(--line);padding:6px 0;font-size:14px}.pk-row:last-child{border-bottom:0}
.pk-row .mono{white-space:nowrap}
@media (max-width:900px){.llayout.hastoc{grid-template-columns:minmax(0,1fr)}.ltoc{position:static;max-height:none;border-left:0;border-bottom:1px solid var(--line);padding:0 0 10px}.lbody{font-size:16.5px}}