/* Nyx Learning note pages. Layout: sticky bar; contents sidebar (desktop) or sheet (mobile); one reading column. */

@font-face{font-family:"Inter";src:url(/fonts/inter.woff2) format("woff2");font-weight:100 900;font-display:swap}
@font-face{font-family:"Source Serif 4";src:url(/fonts/source-serif-4.woff2) format("woff2");font-weight:200 900;font-display:swap}
@font-face{font-family:"JetBrains Mono";src:url(/fonts/jetbrains-mono.woff2) format("woff2");font-weight:100 800;font-display:swap}

/* ---------- themes: every colour lives here ---------- */
:root{
  --f-display:"Source Serif 4",Georgia,serif;
  --f-body:"Inter",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  --f-mono:"JetBrains Mono",ui-monospace,SFMono-Regular,Menlo,monospace;
  --toc-w:264px;--col:700px;--bar-h:62px;--row-h:60px;
}

:root,:root[data-theme="halloween"]{
  --bg:#121014;--surface:#1E1824;--surface2:#2A2132;--fg:#F2EBDD;--muted:#C9BFB0;--line:#3D3046;
  --accent:#FF7A1A;--accent-fg:#121014;--secondary:#A77BFF;--ok:#7CD957;--bad:#FF5A5A;--code-bg:#2C2236;--code-fg:#F4D9FF;
  --tech:#A77BFF;--atk:#FF5A5A;--def:#7CD957;--exec:#FF7A1A;
  --hl-key:rgba(255,122,26,.30);--key-fg:#FFC08A;
  --mech:#A77BFF;--fix:#7CD957;
  --hl-risk:rgba(255,181,71,.15);--risk-line:#FFB547;--risk-fg:#FFE2B8;
  --qual:#F2EBDD;
  --remember-bg:rgba(255,122,26,.08);
  color-scheme:dark;
}
:root[data-theme="dark"]{
  --bg:#1B1D21;--surface:#24272C;--surface2:#2D3137;--fg:#E3E5E8;--muted:#AEB3BC;--line:#3B4047;
  --accent:#86B4FF;--accent-fg:#0F141C;--secondary:#BBA2FF;--ok:#86D693;--bad:#FF8F85;--code-bg:#30343B;--code-fg:#E8DCFF;
  --tech:#BBA2FF;--atk:#FF8F85;--def:#86D693;--exec:#86B4FF;
  --hl-key:rgba(255,214,102,.24);--key-fg:#FFE6A3;
  --mech:#BBA2FF;--fix:#86D693;
  --hl-risk:rgba(255,170,80,.14);--risk-line:#E9A35B;--risk-fg:#FFDDB8;
  --qual:#E3E5E8;
  --remember-bg:rgba(134,180,255,.08);
  color-scheme:dark;
}
:root[data-theme="light"]{
  --bg:#F6F7F9;--surface:#FFFFFF;--surface2:#EEF1F5;--fg:#23262D;--muted:#555B66;--line:#D6DAE1;
  --accent:#1D5BCC;--accent-fg:#FFFFFF;--secondary:#6A3FD0;--ok:#1C7537;--bad:#BF2828;--code-bg:#EEF0F6;--code-fg:#4A2A9A;
  --tech:#6A3FD0;--atk:#BF2828;--def:#1C7537;--exec:#1D5BCC;
  --hl-key:rgba(255,212,0,.42);--key-fg:#1F1A00;
  --mech:#6A3FD0;--fix:#1C7537;
  --hl-risk:#FFF0D6;--risk-line:#B25E00;--risk-fg:#4A2600;
  --qual:#23262D;
  --remember-bg:#EEF4FF;
  color-scheme:light;
}

/* ---------- base ---------- */
*{box-sizing:border-box}
html{scroll-padding-top:calc(var(--bar-h) + 16px);-webkit-text-size-adjust:100%}
html,body{background:var(--bg)}
body{margin:0;color:var(--fg);font-family:var(--f-body);font-size:17.5px;line-height:1.68;font-optical-sizing:auto;text-rendering:optimizeLegibility}
a{color:var(--accent);text-underline-offset:.2em}
p{margin:0 0 1em}
ul,ol{padding-left:1.35em;margin:0 0 1.1em}
li{margin:.35em 0}
li::marker{color:var(--muted)}
h1,h2,h3,h4{font-family:var(--f-display);line-height:1.2;text-wrap:balance;letter-spacing:-.01em}
h3{font-size:1.35rem;margin:2.2em 0 .6em;font-weight:650}
h4{font-size:1.12rem;margin:1.6em 0 .5em;font-weight:650}
code{font-family:var(--f-mono);font-size:.86em;background:var(--code-bg);color:var(--code-fg);padding:.12em .38em;border-radius:6px;overflow-wrap:anywhere;font-variant-ligatures:none}
pre{background:var(--code-bg);border:1px solid var(--line);border-radius:12px;padding:14px 16px;overflow-x:auto;line-height:1.5}
pre code{background:none;padding:0;font-size:.85rem;color:var(--fg);overflow-wrap:normal}
button{font:inherit;color:inherit}
:focus-visible{outline:2.5px solid var(--accent);outline-offset:2px;border-radius:6px}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
.skip{position:absolute;left:-999px;top:8px;z-index:100;background:var(--accent);color:var(--accent-fg);padding:10px 14px;border-radius:8px}
.skip:focus{left:8px}
[hidden]{display:none!important}

/* ---------- emphasis vocabulary ---------- */
mark{background:none;color:inherit}
.hl.k{color:var(--key-fg);background-image:linear-gradient(100deg,transparent .06em,var(--hl-key) .14em,var(--hl-key) calc(100% - .14em),transparent calc(100% - .06em));background-size:100% .62em;background-position:0 86%;background-repeat:no-repeat;-webkit-box-decoration-break:clone;box-decoration-break:clone;padding:0 .14em;margin:0 -.04em;border-radius:.25em}
.hl.k strong{font-weight:700}
.hl.m{text-decoration-line:underline;text-decoration-style:wavy;text-decoration-color:var(--mech);text-decoration-thickness:1.25px;text-underline-offset:.3em;text-decoration-skip-ink:auto}
.hl.r{color:var(--risk-fg);background:var(--hl-risk);border-bottom:1.5px dashed var(--risk-line);padding:.02em .2em;border-radius:.25em .25em 0 0;-webkit-box-decoration-break:clone;box-decoration-break:clone}
.hl.f,.hl.v{text-decoration-line:underline;text-decoration-color:var(--fix);text-decoration-thickness:2.5px;text-underline-offset:.26em;text-decoration-skip-ink:auto}
.hl.v::before{content:"✓\00a0";color:var(--fix);font-weight:700;text-decoration:none;display:inline-block}
.hl.q{font-style:italic;font-weight:650;color:var(--qual)}

/* ---------- top bar ---------- */
.bar{position:sticky;top:0;z-index:30;background:color-mix(in srgb,var(--bg) 92%,transparent);backdrop-filter:saturate(1.4) blur(10px);-webkit-backdrop-filter:saturate(1.4) blur(10px);border-bottom:1px solid var(--line)}
.bar-row{display:flex;align-items:center;gap:12px;padding:8px max(16px,env(safe-area-inset-left));min-height:var(--row-h);max-width:1240px;margin:0 auto}
.home{display:flex;align-items:center;gap:8px;color:var(--fg);text-decoration:none;font-family:var(--f-display);font-weight:700;font-size:1.05rem;min-height:44px;flex:0 0 auto}
.pumpkin{display:none}
:root[data-theme="halloween"] .pumpkin{display:block}
.crumb{flex:1 1 auto;min-width:0;color:var(--muted);font-size:.9rem;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.crumb a{color:inherit;text-decoration:none}
.crumb a:hover{color:var(--fg);text-decoration:underline}
.seg{display:flex;border:1px solid var(--line);border-radius:999px;padding:3px;gap:2px;background:var(--surface);flex:0 0 auto}
.seg button{min-height:38px;min-width:44px;padding:0 14px;border:0;border-radius:999px;background:transparent;color:var(--muted);font-size:.9rem;font-weight:550;cursor:pointer;display:inline-flex;align-items:center;justify-content:center;gap:6px}
.seg button[aria-pressed="true"]{background:var(--accent);color:var(--accent-fg)}
.seg button:not([aria-pressed="true"]):hover{color:var(--fg);background:var(--surface2)}
.theme button span{display:none}
.theme button{padding:0 10px}
.toc-btn{display:none}
.readbar{height:2px;background:transparent}
body[data-mode="practice"] .readbar{visibility:hidden}
.readbar span{display:block;height:100%;width:0;background:var(--accent);transition:width .15s linear}

/* ---------- layout ---------- */
.layout{max-width:1240px;margin:0 auto;display:grid;grid-template-columns:var(--toc-w) minmax(0,1fr);gap:56px;padding:0 max(24px,env(safe-area-inset-left))}
main{min-width:0;max-width:var(--col);padding:40px 0 120px}

/* ---------- contents ---------- */
.toc{position:sticky;top:calc(var(--bar-h) + 2px);align-self:start;max-height:calc(100vh - var(--bar-h) - 2px);overflow-y:auto;padding:28px 4px 40px 0;scrollbar-width:thin}
.toc-h{padding:0 10px 14px;border-bottom:1px solid var(--line);margin-bottom:12px}
.toc-title{font-family:var(--f-display);font-weight:650;font-size:1.02rem;line-height:1.3}
.toc-prog{font-size:.8rem;color:var(--muted);margin-top:4px}
.toc-g{font-size:.75rem;font-weight:650;letter-spacing:.08em;text-transform:uppercase;color:var(--muted);padding:14px 10px 6px}
.toc-l{list-style:none;margin:0;padding:0}
.toc-l li{margin:1px 0}
.toc-l a{display:flex;align-items:center;gap:10px;min-height:40px;padding:6px 10px;border-radius:10px;color:var(--muted);text-decoration:none;font-size:.93rem;line-height:1.3}
.toc-l a:hover{background:var(--surface);color:var(--fg)}
.toc-l a.cur{background:var(--surface2);color:var(--fg);font-weight:600;box-shadow:inset 3px 0 0 var(--accent)}
.tn{font-family:var(--f-mono);font-size:.72rem;color:var(--muted);width:1.6em;flex:0 0 auto;opacity:.8}
.tl{flex:1 1 auto}
.tick{width:16px;height:16px;flex:0 0 auto;border-radius:50%;border:1.5px solid var(--line)}
.toc-l a[data-mode="practice"] .tick{display:none}
.toc-l a.read .tick{border-color:var(--ok);background:var(--ok);-webkit-mask:none;position:relative}
.toc-l a.read .tick::after{content:"";position:absolute;left:4.5px;top:1.5px;width:4px;height:8px;border:solid var(--bg);border-width:0 2px 2px 0;transform:rotate(45deg)}

/* ---------- sync status ---------- */
.sync{font-size:.8rem;color:var(--muted);margin-top:6px;line-height:1.4}
.sync a{color:var(--accent);font-weight:600}
.sync-dot{display:inline-block;width:7px;height:7px;border-radius:50%;margin-right:6px;vertical-align:1px;background:var(--muted)}
.sync-dot.ok{background:var(--ok)}.sync-dot.err{background:var(--bad)}
.sync-dot.busy{background:var(--accent);animation:pulse 1s ease-in-out infinite alternate}
@keyframes pulse{to{opacity:.3}}
.lib-sync{margin-top:12px;font-size:.88rem}

/* ---------- note header ---------- */
.note-h{margin-bottom:12px}
.eyebrow{font-size:.85rem;font-weight:600;color:var(--accent);letter-spacing:.02em}
.note-h h1{font-size:clamp(2rem,5vw,2.85rem);margin:.2em 0 .25em;font-weight:700;letter-spacing:-.02em}
.lede{font-size:1.18rem;color:var(--muted);margin:0 0 .6em;line-height:1.5}
.meta{font-size:.85rem;color:var(--muted);line-height:1.5}
.note-h.compact h1{font-size:1.7rem}

/* ---------- sections ---------- */
.sec{padding-top:56px}
.sec-h{margin:0 0 22px;padding-bottom:14px;border-bottom:1px solid var(--line)}
.sec-row{display:flex;align-items:baseline;gap:14px;flex-wrap:wrap}
.sec-row .tag{margin:0 0 0 auto;align-self:center}
.sec-sub{margin:.35em 0 0 calc(1.6em + 14px);color:var(--muted);font-family:var(--f-display);font-size:1.12rem;font-style:italic}
.sec-n{font-family:var(--f-mono);font-size:.85rem;font-weight:600;color:var(--accent);flex:0 0 auto}
.sec-h h2{font-size:clamp(1.65rem,3.6vw,2.05rem);margin:0;font-weight:700}
.sec > h3:first-of-type{margin-top:1.4em}
.sec-end{height:1px}
.stub{color:var(--muted);font-style:italic;border:1px dashed var(--line);border-radius:12px;padding:16px 18px}

/* ---------- blocks ---------- */
.box{background:var(--surface);border:1px solid var(--line);border-radius:16px;padding:20px 22px;margin:0 0 1.4em}
.box > :last-child{margin-bottom:0}
.box-t{font-family:var(--f-display);font-weight:650;font-size:1.12rem;margin:0 0 .6em}
.grid2{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:14px;margin:0 0 1.4em}
.grid2 > .box{margin:0}
.lens{border-top:3px solid var(--lens-c,var(--line))}
.lens-atk{--lens-c:var(--atk)}.lens-def{--lens-c:var(--def)}.lens-tech{--lens-c:var(--tech)}.lens-exec{--lens-c:var(--exec)}
.tag{display:inline-flex;align-items:center;gap:6px;font-size:.75rem;font-weight:650;letter-spacing:.04em;text-transform:uppercase;color:var(--tag-c,var(--muted));margin:0 0 .7em}
.tag::before{content:"";width:8px;height:8px;border-radius:50%;background:var(--tag-c,var(--muted))}
.tag.atk{--tag-c:var(--atk)}.tag.def{--tag-c:var(--def)}.tag.tech{--tag-c:var(--tech)}.tag.exec{--tag-c:var(--exec)}
.lens .tag{display:flex}
.remember{border:1.5px solid var(--accent);background:var(--remember-bg);border-radius:14px;padding:14px 18px;margin:0 0 1.4em;font-size:1.05rem}
.remember-t{font-size:.75rem;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--accent);margin-bottom:4px}
.remember p:last-child{margin:0}
.five ol{list-style:none;counter-reset:five;padding:0;display:grid;gap:12px}
.five li{counter-increment:five;position:relative;background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:14px 18px 14px 62px;margin:0}
.five li::before{content:counter(five);position:absolute;left:16px;top:12px;width:32px;height:32px;border-radius:50%;background:var(--accent);color:var(--accent-fg);font-family:var(--f-display);font-weight:700;display:grid;place-items:center;font-size:1rem}
.five li > strong:first-child{display:block;font-family:var(--f-display);font-size:1.08rem;margin-bottom:2px}
.tbl{overflow-x:auto;margin:0 0 1.4em;border:1px solid var(--line);border-radius:12px}
table{border-collapse:collapse;width:100%;font-size:.93rem;line-height:1.5}
th,td{text-align:left;padding:10px 14px;border-bottom:1px solid var(--line);vertical-align:top}
th{background:var(--surface2);font-weight:650}
tr:last-child td{border-bottom:0}
.contrast{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:14px;margin:0 0 1.4em}
.side-card{background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:16px 18px}
.side-card h4{margin:0 0 .4em}
details.more,details.hl-key{border:1px solid var(--line);border-radius:14px;margin:0 0 1.4em;background:var(--surface)}
details.more > summary,details.hl-key > summary{cursor:pointer;min-height:48px;display:flex;align-items:center;padding:0 18px;font-weight:600;list-style:none}
details > summary::-webkit-details-marker{display:none}
details.more > summary::after,details.hl-key > summary::after{content:"";margin-left:auto;width:9px;height:9px;border:solid var(--muted);border-width:0 2px 2px 0;transform:rotate(45deg);transition:transform .15s}
details[open].more > summary::after,details[open].hl-key > summary::after{transform:rotate(-135deg)}
.more-b{padding:0 18px 16px}
.key-list{display:grid;gap:10px;margin:0}
.key-list > div{display:grid;grid-template-columns:minmax(150px,auto) 1fr;gap:4px 16px;align-items:baseline}
.key-list dt{font-size:1rem}
.key-list dd{margin:0;color:var(--muted);font-size:.9rem;line-height:1.5}

/* ---------- concepts ---------- */
.concepts{display:grid;grid-template-columns:minmax(0,1fr);gap:10px;margin-top:1.2em}
.concept{background:var(--surface);border:1px solid var(--line);border-radius:16px}
.concept[open]{border-color:color-mix(in srgb,var(--accent) 45%,var(--line))}
.concept > summary{display:flex;gap:14px;align-items:flex-start;cursor:pointer;padding:16px 18px;list-style:none;min-height:56px}
.concept > summary::after{content:"";flex:0 0 auto;margin:10px 2px 0 auto;width:9px;height:9px;border:solid var(--muted);border-width:0 2px 2px 0;transform:rotate(45deg);transition:transform .15s}
.concept[open] > summary::after{transform:rotate(-135deg)}
.cnum{font-family:var(--f-mono);font-size:.8rem;font-weight:600;color:var(--accent);padding-top:.3em;flex:0 0 auto}
.ct{display:flex;flex-direction:column;gap:3px;min-width:0}
.ctitle{font-family:var(--f-display);font-weight:650;font-size:1.15rem;line-height:1.3}
.cdef{color:var(--fg);font-size:.98rem;line-height:1.55;opacity:.92}
.cbody{padding:0 18px 18px 52px}
.lbl{font-size:.75rem;font-weight:650;letter-spacing:.06em;text-transform:uppercase;color:var(--muted);margin:.9em 0 .25em}
details.deeper{border-top:1px solid var(--line);margin-top:1em;padding-top:4px}
details.deeper > summary{cursor:pointer;min-height:44px;display:flex;align-items:center;gap:10px;font-weight:600;list-style:none}
details.deeper > summary .tag{margin:0}
details.deeper .more-b{padding:0}

/* ---------- callouts + misc blocks ---------- */
.callout{border-left:4px solid var(--secondary);background:var(--surface);border-radius:0 12px 12px 0;padding:14px 18px;margin:0 0 1.4em;font-size:.97rem}
.callout.warn{border-left-color:var(--risk-line);background:color-mix(in srgb,var(--hl-risk) 60%,var(--surface))}
.callout-t{font-size:.75rem;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--risk-line);margin-bottom:4px}
.callout > :last-child{margin-bottom:0}
div.meta{font-size:.92rem;color:var(--muted);margin:0 0 1em}
div.meta ul{margin:0}
h3.h-tag,h4.h-tag{margin-bottom:.4em}
h3.h-tag .tag,h4.h-tag .tag{font-size:.85rem;margin:0}
pre + p,ul + pre,ol + pre{margin-top:1em}
li > pre{margin:.6em 0 .4em}

/* ---------- attacks ---------- */
.attacks{display:grid;grid-template-columns:minmax(0,1fr);gap:12px;margin:1.2em 0 1.6em}
.attack{background:var(--surface);border:1px solid var(--line);border-top:3px solid var(--atk);border-radius:16px}
.attack > summary{cursor:pointer;list-style:none;padding:16px 18px;display:flex;flex-direction:column;gap:6px;min-height:56px;position:relative;padding-right:44px}
.attack > summary::after{content:"";position:absolute;right:20px;top:24px;width:9px;height:9px;border:solid var(--muted);border-width:0 2px 2px 0;transform:rotate(45deg);transition:transform .15s}
.attack[open] > summary::after{transform:rotate(-135deg)}
.atk-t{font-family:var(--f-display);font-weight:650;font-size:1.2rem;line-height:1.3}
.atk-m{font-size:.85rem;color:var(--muted);display:flex;gap:8px;align-items:baseline;flex-wrap:wrap}
.atk-m .tag{margin:0}
.atk-b{padding:0 18px 18px}
.atk-b > .lbl:first-child{margin-top:0}
.atk-pre{background:var(--hl-risk);border:1px dashed var(--risk-line);border-radius:12px;padding:2px 14px 4px;margin:.8em 0}
.atk-pre p{margin-bottom:.6em}
.lbl .tag{margin:0 8px 0 0}

/* ---------- flows ---------- */
.flow{margin:1.2em 0 2em}
.flow-pick{flex-wrap:wrap;border-radius:16px;margin-bottom:12px;width:fit-content;max-width:100%}
.flow-pick button{border-radius:12px;min-height:40px}
.flow-svg{background:var(--surface);border:1px solid var(--line);border-radius:16px;padding:8px}
.flow-svg svg{display:block;width:100%;max-width:520px;height:auto;margin:0 auto}
.flow-ctl{display:grid;grid-template-columns:1fr auto 1fr;gap:10px;align-items:center;margin:12px 0}
.flow-ctl [data-flow-next]{justify-self:end}
.flow-ctl [data-flow-prev]{justify-self:start}
.flow-count{color:var(--muted);font-size:.9rem;font-variant-numeric:tabular-nums}
.btn:disabled{opacity:.4;cursor:default}
.flow-desc{min-height:110px}
.flow-desc > :last-child{margin-bottom:0}
.sv-life{stroke:var(--line);stroke-width:2;stroke-dasharray:4 5}
.sv-hdr{fill:var(--surface2);stroke:var(--line);stroke-width:1.5}
.sv-hdr.atk{stroke:var(--bad)}
.sv-t{fill:var(--fg);font-family:var(--f-body);font-size:14px;font-weight:700}
.sv-a line{stroke:var(--muted);stroke-width:2}
.sv-a polygon{fill:var(--muted)}
.sv-a text.l{fill:var(--fg);font-family:var(--f-mono);font-size:13px;font-weight:700}
.sv-a text.s,.sv-b text.s{fill:var(--muted);font-family:var(--f-body);font-size:12.5px}
.sv-a.fut,.sv-b.fut{opacity:.22}
.sv-a.cur line{stroke:var(--accent);stroke-width:3}
.sv-a.cur polygon{fill:var(--accent)}
.sv-a.cur text.l{fill:var(--accent)}
.sv-a.bad.cur line{stroke:var(--bad)}
.sv-a.bad.cur polygon,.sv-a.bad.cur text.l{fill:var(--bad)}
.sv-b rect{fill:var(--surface2);stroke:var(--muted);stroke-width:1.5}
.sv-b.cur rect{stroke:var(--bad);stroke-width:2.5}
.sv-b text.l{fill:var(--fg);font-family:var(--f-body);font-size:13.5px;font-weight:700}

/* ---------- exec Q&A, jargon, say-this, translate ---------- */
.qa{display:grid;gap:8px;margin:0 0 1.6em}
.qa-i{background:var(--surface);border:1px solid var(--line);border-radius:14px}
.qa-i > summary{cursor:pointer;list-style:none;min-height:52px;display:flex;align-items:center;padding:12px 44px 12px 18px;font-weight:600;position:relative}
.qa-i > summary::after{content:"";position:absolute;right:20px;top:50%;margin-top:-7px;width:9px;height:9px;border:solid var(--muted);border-width:0 2px 2px 0;transform:rotate(45deg);transition:transform .15s}
.qa-i[open] > summary::after{transform:rotate(-135deg)}
.jargon{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:12px;margin:0 0 1.6em}
.jg{background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:14px 16px}
.jg-t{font-family:var(--f-display);font-weight:650;font-size:1.08rem;margin-bottom:4px}
.jg p{margin:0 0 .5em;font-size:.95rem}
.jg-ex{color:var(--muted);font-style:italic;margin:0!important}
.say{display:grid;gap:10px;margin:0 0 1.6em}
.say-row{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.say-not,.say-yes{border-radius:14px;padding:12px 16px;border:1px solid var(--line);background:var(--surface)}
.say-not{border-left:4px solid var(--bad)}
.say-yes{border-left:4px solid var(--ok)}
.say-not .lbl{color:var(--bad);margin-top:0}.say-yes .lbl{color:var(--ok);margin-top:0}
.say-row p{margin:0;font-size:.97rem}
.xlate{display:grid;gap:12px;margin:0 0 1.6em}
.xl-p{font-family:var(--f-display);font-weight:650;font-size:1.08rem}

/* ---------- acronyms ---------- */
.acr-tbl td:first-child b{font-family:var(--f-mono);font-size:.92rem}
.acr-tbl td:nth-child(2){font-weight:550}
.acr-big{font-family:var(--f-mono);font-weight:700;font-size:1.9rem;letter-spacing:.02em}
.q-t .acr-big{font-size:1.25rem;color:var(--accent)}
.acr-exp{display:block;font-family:var(--f-display);font-size:1.35rem;margin-bottom:.4em}
.acr-def{display:block;margin-bottom:.5em}
.acr-why{display:block;color:var(--muted);font-size:.95rem}
.wrap-seg{flex-wrap:wrap;border-radius:16px;margin:8px 0 16px;width:fit-content;max-width:100%}
.wrap-seg button{border-radius:12px}

/* ---------- quiz, drills, matching, export ---------- */
.score{font-size:.9rem;color:var(--muted);font-variant-numeric:tabular-nums;margin:6px 0 10px}
.q{margin:0 0 14px}
.q-t{font-size:1.05rem;font-weight:500;margin:0 0 12px}
.q-n{font-family:var(--f-mono);font-weight:700;color:var(--accent);margin-right:4px}
.opts{display:grid;gap:8px}
.opt{text-align:left;min-height:48px;padding:10px 14px;border-radius:12px;border:1px solid var(--line);background:var(--bg);color:var(--fg);font-size:.97rem;line-height:1.45;cursor:pointer}
.opt:not(:disabled):hover{border-color:var(--muted)}
.opt:disabled{cursor:default}
.opt.right{border-color:var(--ok);background:color-mix(in srgb,var(--ok) 14%,var(--bg));font-weight:600}
.opt.right::before{content:"✓ ";color:var(--ok);font-weight:700}
.opt.wrong{border-color:var(--bad);background:color-mix(in srgb,var(--bad) 12%,var(--bg))}
.opt.wrong::before{content:"✗ ";color:var(--bad);font-weight:700}
.q .msg{margin-top:12px;line-height:1.55}
.quiz-score{border-color:var(--accent);font-size:1.05rem}
.drill-h{display:flex;align-items:center;gap:10px;margin-bottom:8px}
.drill-h .tag{margin:0}
.drill-a{border-top:1px solid var(--line);margin-top:12px;padding-top:4px}
textarea{width:100%;min-height:110px;border-radius:12px;border:1px solid var(--line);background:var(--bg);color:var(--fg);font:inherit;font-size:.95rem;padding:10px 12px;line-height:1.5;resize:vertical}
textarea[readonly]{font-family:var(--f-mono);font-size:.8rem;white-space:pre;overflow:auto}
.mgrid{display:grid;grid-template-columns:minmax(0,.7fr) minmax(0,1.3fr);gap:10px;margin:8px 0}
.mcol{display:grid;gap:8px;align-content:start}
.mb{min-height:52px;padding:8px 12px;border-radius:12px;border:1px solid var(--line);background:var(--surface);color:var(--fg);font-size:.92rem;line-height:1.3;cursor:pointer;text-align:left}
.mcol:first-child .mb{font-family:var(--f-mono);font-weight:700;text-align:center}
.mb.sel{border-color:var(--accent);box-shadow:inset 0 0 0 1.5px var(--accent)}
.mb.done{opacity:.4;border-style:dashed;cursor:default}
.mb.err{border-color:var(--bad);background:color-mix(in srgb,var(--bad) 14%,var(--surface))}
.hint{font-size:.88rem;color:var(--muted)}
.row.tight{margin:0}
.fc.static{cursor:default}
.scope{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin-top:12px}
.scope-k{font-size:.85rem;color:var(--muted);font-weight:600}
.scope .seg button{min-height:36px;font-size:.85rem}

/* ---------- part nav + footer ---------- */
.partnav{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:72px}
.pn-l{display:flex;flex-direction:column;gap:2px;padding:14px 18px;border:1px solid var(--line);border-radius:14px;background:var(--surface);text-decoration:none;color:var(--fg);min-height:64px}
.pn-l[rel="next"]{text-align:right}
a.pn-l:hover{border-color:var(--accent)}
.pn-l.off{opacity:.5}
.pn-k{font-size:.78rem;color:var(--muted);font-weight:600}
.pn-t{font-family:var(--f-display);font-weight:650}
.endmark{margin-top:32px;text-align:center;font-size:.85rem;color:var(--muted)}

/* ---------- practice ---------- */
.ptabs{display:flex;gap:6px;flex-wrap:wrap;margin:18px 0 8px;padding-bottom:14px;border-bottom:1px solid var(--line)}
.ptabs button{min-height:44px;padding:0 16px;border-radius:999px;border:1px solid var(--line);background:var(--surface);color:var(--muted);font-weight:600;font-size:.93rem;cursor:pointer}
.ptabs button[aria-selected="true"]{background:var(--accent);color:var(--accent-fg);border-color:var(--accent)}
.ppanel > h2{font-size:1.6rem;margin:24px 0 12px}
.btn{min-height:44px;padding:0 18px;border-radius:12px;border:1px solid var(--line);background:var(--surface);color:var(--fg);font-weight:600;font-size:.95rem;cursor:pointer;display:inline-flex;align-items:center;justify-content:center;gap:8px}
.btn:hover{border-color:var(--muted)}
.btn.pri{background:var(--accent);border-color:var(--accent);color:var(--accent-fg)}
.btn.ok{border-color:var(--ok);color:var(--ok)}
.btn.bad{border-color:var(--bad);color:var(--bad)}
.btn[aria-pressed="true"]{background:var(--surface2);border-color:var(--accent)}
.row{display:flex;flex-wrap:wrap;gap:10px;align-items:center;margin:12px 0}
select,input[type=text]{min-height:44px;border-radius:12px;border:1px solid var(--line);background:var(--surface);color:var(--fg);font:inherit;font-size:1rem;padding:0 12px}
input[type=text]{width:100%}
.fc-tools{display:flex;flex-wrap:wrap;gap:10px;align-items:center;margin:8px 0 14px}
.fc-tools .grow{flex:1 1 auto}
.meter{display:flex;height:8px;border-radius:99px;overflow:hidden;background:var(--surface2);margin:4px 0 6px}
.meter .g{background:var(--ok)}.meter .m{background:var(--bad)}
.fc-stats{display:flex;gap:16px;flex-wrap:wrap;font-size:.85rem;color:var(--muted);margin-bottom:12px}
.fc-stats b{color:var(--fg);font-weight:650}
.fc{display:flex;flex-direction:column;gap:14px;width:100%;min-height:280px;text-align:left;padding:22px 24px;border-radius:20px;border:1px solid var(--line);background:var(--surface);color:var(--fg);font-size:1.15rem;line-height:1.6;cursor:pointer;box-shadow:0 1px 0 var(--line)}
.fc.back{border-color:color-mix(in srgb,var(--accent) 55%,var(--line));background:linear-gradient(var(--surface),var(--surface)) padding-box}
.fc-side{display:flex;justify-content:space-between;align-items:center;font-size:.78rem;color:var(--muted);font-weight:600}
.fc-cat{padding:3px 10px;border-radius:99px;background:var(--surface2);color:var(--fg)}
.fc-text{flex:1 1 auto;display:flex;align-items:center}
.fc-text > span{display:block;width:100%}
.fc-hint{font-size:.8rem;color:var(--muted);text-align:center}
.fc .blank{display:inline-block;min-width:5.5em;border-bottom:2.5px solid var(--accent);margin:0 .15em;height:1.1em;vertical-align:-.1em}
.fc mark.ans{background:var(--hl-key);color:var(--key-fg);font-weight:700;padding:0 .2em;border-radius:.25em}
.fc-nav{display:grid;grid-template-columns:auto 1fr auto;gap:10px;align-items:center;margin:14px 0}
.fc-pos{text-align:center;color:var(--muted);font-size:.9rem;font-variant-numeric:tabular-nums}
.fc-mark{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.fc-mark .btn{min-height:52px;font-size:1rem}
.msg{min-height:1.5em;font-size:.95rem;margin:6px 0 0}
.okc{color:var(--ok);font-weight:650}.badc{color:var(--bad);font-weight:650}
.kbd-hint{font-size:.8rem;color:var(--muted);margin-top:10px}
kbd{font-family:var(--f-mono);font-size:.75rem;border:1px solid var(--line);border-bottom-width:2px;border-radius:5px;padding:0 5px;background:var(--surface)}

/* ---------- library (home page) ---------- */
.lib-main{max-width:1040px;margin:0 auto;padding:0 max(16px,env(safe-area-inset-left)) 96px}
.lib-row{max-width:1040px}
.lib-home{display:inline!important}
.lib-hero{padding:48px 0 12px}
.lib-hero h1{font-size:clamp(2.1rem,6vw,3.1rem);margin:0 0 .3em;letter-spacing:-.02em}
.lib-hero p{color:var(--muted);max-width:62ch;margin:0 0 22px;font-size:1.08rem}
.lib-search{width:100%;min-height:52px;padding:0 18px;border-radius:14px;border:1px solid var(--line);background:var(--surface);color:var(--fg);font:inherit;font-size:1rem}
.lib-stats{color:var(--muted);font-size:.88rem;margin-top:10px}
.lib-series{margin-top:48px}
.lib-sh{display:flex;align-items:baseline;gap:12px;flex-wrap:wrap;border-bottom:1px solid var(--line);padding-bottom:10px;margin-bottom:16px}
.lib-sh h2{font-size:1.8rem;margin:0}
.lib-count{color:var(--muted);font-size:.88rem}
.lib-desc{color:var(--muted);margin:-4px 0 16px}
.lib-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:14px}
.lib-card{display:flex;flex-direction:column;gap:6px;padding:20px;border-radius:16px;border:1px solid var(--line);background:var(--surface);color:var(--fg);text-decoration:none;transition:border-color .15s,transform .15s}
a.lib-card:hover{border-color:var(--accent);transform:translateY(-2px)}
.lib-card.missing{border-style:dashed;background:transparent;color:var(--muted)}
.lib-part{font:600 .78rem var(--f-mono);color:var(--accent);letter-spacing:.04em;text-transform:uppercase}
.lib-title{font-family:var(--f-display);font-weight:650;font-size:1.25rem;line-height:1.25}
.lib-sub{color:var(--muted);font-size:.95rem;line-height:1.45}
.lib-prog{font-size:.82rem;color:var(--fg);display:flex;align-items:center;gap:8px;flex-wrap:wrap;min-height:0}
.lib-prog:empty{display:none}
.lib-meter{display:inline-block;width:64px;height:6px;border-radius:9px;background:var(--surface2);overflow:hidden;vertical-align:middle}
.lib-meter span{display:block;height:100%;background:var(--ok)}
.lib-foot-r{margin-top:auto;padding-top:8px;font-size:.8rem;color:var(--muted);display:flex;gap:4px 12px;flex-wrap:wrap}
.lib-empty{color:var(--muted);margin-top:32px}
.lib-foot{text-align:center;color:var(--muted);font-size:.85rem;padding:24px 16px;border-top:1px solid var(--line)}
@media (prefers-reduced-motion:reduce){a.lib-card:hover{transform:none}}

/* ---------- mobile ---------- */
.bar-row2{display:none}
@media (max-width:1000px){
  .layout{display:block;padding:0 16px}
  main{margin:0 auto;padding-top:24px}
  .bar-row{gap:10px;padding:6px 16px;min-height:52px}
  .bar-row > .modes{display:none}
  .home-t{display:none}
  :root:not([data-theme="halloween"]) .home-t{display:inline}
  .bar-row2{display:flex;gap:8px;padding:0 16px 8px}
  .bar-row2 .modes{flex:0 0 auto}
  .bar-row2 .modes button{padding:0 12px}
  .toc-btn{display:flex;align-items:center;gap:8px;flex:1 1 auto;min-width:0;min-height:44px;padding:0 12px;border-radius:12px;border:1px solid var(--line);background:var(--surface);color:var(--fg);cursor:pointer;text-align:left}
  .toc-btn svg{flex:0 0 auto;color:var(--muted)}
  .toc-btn-cur{flex:1 1 auto;font-weight:600;font-size:.95rem;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
  .toc-btn-n{font-size:.78rem;color:var(--muted);font-variant-numeric:tabular-nums}
  .toc{position:fixed;inset:var(--bar-h) 0 0 0;z-index:25;max-height:none;background:var(--bg);padding:8px 16px 40px;display:none;overflow-y:auto}
  body.toc-open .toc{display:block}
  body.toc-open{overflow:hidden}
  .toc-l a{min-height:48px;font-size:1rem}
  .cbody{padding-left:18px}
  .partnav{grid-template-columns:1fr}
  .say-row{grid-template-columns:1fr}
  .sec-sub{margin-left:0}
  .pn-l[rel="next"]{text-align:left}
}
@media (max-width:560px){
  body{font-size:17px}
  .theme button{min-width:40px;padding:0 8px}
  .box{padding:16px}
  .five li{padding:14px 14px 14px 56px}
  .five li::before{left:12px}
  .key-list > div{grid-template-columns:1fr}
  .fc{padding:18px;min-height:240px;font-size:1.08rem}
  .note-h h1{font-size:1.9rem}
  .sec{padding-top:44px}
}
@media (prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto!important}}
@media print{.bar,.toc,.partnav{display:none}.layout{display:block}main{max-width:none}}