/* AIEIO Book Library - shared styles. Design tokens mirror the main aieio.au site. */
@font-face{font-family:'Inter';font-style:normal;font-weight:400;font-display:swap;src:url('/fonts/inter-400-latin.woff2') format('woff2')}
@font-face{font-family:'Inter';font-style:normal;font-weight:500;font-display:swap;src:url('/fonts/inter-500-latin.woff2') format('woff2')}
@font-face{font-family:'Inter';font-style:normal;font-weight:600;font-display:swap;src:url('/fonts/inter-600-latin.woff2') format('woff2')}
@font-face{font-family:'Sora';font-style:normal;font-weight:600;font-display:swap;src:url('/fonts/sora-600-latin.woff2') format('woff2')}
@font-face{font-family:'Sora';font-style:normal;font-weight:700;font-display:swap;src:url('/fonts/sora-700-latin.woff2') format('woff2')}
@font-face{font-family:'Sora';font-style:normal;font-weight:800;font-display:swap;src:url('/fonts/sora-800-latin.woff2') format('woff2')}

:root{
  --bg:#0a0b14; --bg2:#0d0e1a; --surface:#12131f; --surface2:#171829;
  --text:#e9eaf2; --muted:#9aa0b5; --line:rgba(255,255,255,.08);
  --brand:#7c5cff; --brand2:#18d3c8; --grad:linear-gradient(110deg,#7c5cff 0%,#18d3c8 100%);
  --ocean:#2f7dff; --ocean2:#5ad2ff; --red:#ff5c6e;
  --radius:18px; --maxw:1140px; --readw:760px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:96px;-webkit-text-size-adjust:100%;text-size-adjust:100%}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{animation-duration:.001ms!important;transition-duration:.001ms!important}}
body{margin:0;background:var(--bg);color:var(--text);font:400 1rem/1.7 Inter,system-ui,-apple-system,Segoe UI,sans-serif;-webkit-font-smoothing:antialiased;-webkit-tap-highlight-color:rgba(24,211,200,.18)}
img,svg{max-width:100%}
a{color:var(--brand2);text-decoration:none}
a:hover{text-decoration:underline}
:focus-visible{outline:2px solid var(--brand2);outline-offset:3px;border-radius:4px}
.container{width:min(100% - 40px,var(--maxw));margin-inline:auto}
h1,h2,h3,h4{font-family:Sora,Inter,sans-serif;line-height:1.2;margin:0 0 .5em}
h1{font-weight:800;font-size:clamp(2rem,5vw,3.1rem);letter-spacing:-.02em}
h2{font-weight:700;font-size:clamp(1.45rem,3vw,2rem);letter-spacing:-.01em}
h3{font-weight:600;font-size:1.14rem}
p{margin:0 0 1.05em}
.skip{position:absolute;left:-9999px}
.skip:focus{left:12px;top:12px;z-index:100;background:var(--surface2);padding:10px 16px;border-radius:10px}

/* nav */
.nav{position:sticky;top:0;z-index:50;background:rgba(10,11,20,.82);backdrop-filter:blur(12px);border-bottom:1px solid var(--line)}
.nav-inner{display:flex;align-items:center;justify-content:space-between;gap:16px;height:64px}
.logo{font-family:Sora;font-weight:800;font-size:1.16rem;color:var(--text);letter-spacing:-.02em}
.logo:hover{text-decoration:none}
.logo .dot{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.nav-links{display:flex;align-items:center;gap:24px;font-size:.92rem}
.nav-links a{color:var(--muted)}
.nav-links a:hover{color:var(--text);text-decoration:none}
.nav-links a[aria-current]{color:var(--text)}
/* On small screens keep the section link + the CTA; drop the homepage anchors. */
@media (max-width:720px){
  .nav-inner{height:58px}
  .nav-links{gap:14px}
  .nav-links a.hide-sm{display:none}
  .nav-links a:not(.btn){padding:11px 0}   /* comfortable touch target */
  .logo{font-size:1.05rem;padding:9px 0}
}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:9px;background:var(--grad);color:#0a0b14;font-weight:600;border:0;border-radius:999px;padding:13px 24px;cursor:pointer;font-size:.95rem;font-family:inherit}
.btn:hover{text-decoration:none;filter:brightness(1.08)}
.btn-sm{padding:9px 17px;font-size:.87rem}
.btn-ghost{background:transparent;border:1px solid var(--line);color:var(--text)}
.btn-ghost:hover{border-color:var(--brand2);filter:none}

/* footer */
.footer{border-top:1px solid var(--line);padding:34px 0;margin-top:72px}
.footer-inner{display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap}
.footer p{color:var(--muted);font-size:.88rem;margin:0}
.footer .logo{font-size:1rem}

/* hero */
.hero{position:relative;padding:64px 0 44px;overflow:hidden;border-bottom:1px solid var(--line)}
.hero::before{content:"";position:absolute;inset:-40% -10% auto;height:520px;background:radial-gradient(50% 60% at 30% 40%,rgba(47,125,255,.20),transparent 70%),radial-gradient(45% 55% at 75% 30%,rgba(124,92,255,.16),transparent 70%);pointer-events:none}
.hero>*{position:relative}
.eyebrow{display:inline-flex;align-items:center;gap:9px;font-size:.78rem;font-weight:600;letter-spacing:.09em;text-transform:uppercase;color:var(--muted);border:1px solid var(--line);background:var(--surface);border-radius:999px;padding:6px 14px;margin-bottom:20px}
.eyebrow .pip{width:6px;height:6px;border-radius:50%;background:var(--brand2)}
.lede{font-size:1.14rem;color:var(--muted);max-width:64ch}
.crumbs{font-size:.84rem;color:var(--muted);margin-bottom:18px}
.crumbs a{color:var(--muted)}
.crumbs span{opacity:.5;margin:0 7px}

/* library grid */
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:20px;margin-top:34px}
.card{display:flex;flex-direction:column;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:24px;transition:border-color .2s,transform .2s}
a.card:hover{border-color:rgba(24,211,200,.45);transform:translateY(-3px);text-decoration:none}
.card h3{color:var(--text);margin-bottom:4px}
.card .by{color:var(--muted);font-size:.88rem;margin-bottom:12px}
.card p{color:var(--muted);font-size:.93rem;flex:1}
.card .meta{display:flex;gap:14px;font-size:.8rem;color:var(--muted);border-top:1px solid var(--line);padding-top:13px;margin-top:6px}
.card.soon{opacity:.55}
.spine{height:5px;border-radius:99px;margin-bottom:18px;background:var(--grad)}
.spine.ocean{background:linear-gradient(110deg,#2f7dff,#5ad2ff)}

/* article */
.wrap{display:grid;grid-template-columns:minmax(0,1fr) 240px;gap:56px;align-items:start;padding-top:44px}
/* minmax(0,1fr) is required: a plain 1fr takes its automatic minimum from the
   prose column's content, which stops the whole page shrinking below 760px. */
@media (max-width:980px){.wrap{grid-template-columns:minmax(0,1fr);gap:0}.toc{display:none}}
.prose{max-width:var(--readw);min-width:0;overflow-wrap:break-word}
.prose h2{margin-top:2.2em;padding-top:.3em;scroll-margin-top:150px}
.prose h3{margin-top:1.9em;color:var(--text);scroll-margin-top:150px}
.prose ul,.prose ol{padding-left:1.25em;margin:0 0 1.15em}
.prose li{margin-bottom:.5em}
.prose li::marker{color:var(--brand2)}
.prose strong{color:#fff;font-weight:600}
.prose blockquote{margin:1.6em 0;padding:2px 0 2px 22px;border-left:3px solid var(--brand);color:var(--muted);font-size:1.05rem}
.prose hr{border:0;border-top:1px solid var(--line);margin:3em 0}

/* table of contents */
.toc{position:sticky;top:96px;font-size:.87rem;border-left:1px solid var(--line);padding-left:20px}
.toc strong{display:block;font-family:Sora;font-size:.74rem;letter-spacing:.1em;text-transform:uppercase;color:var(--muted);margin-bottom:12px}
.toc a{display:block;color:var(--muted);padding:4px 0;border-left:2px solid transparent;margin-left:-22px;padding-left:20px}
.toc a:hover{color:var(--text);text-decoration:none}
.toc a.on{color:var(--text);border-left-color:var(--brand2)}
.toc .sub{padding-left:32px;font-size:.83rem}

/* mobile table of contents (replaces the sticky sidebar under 980px) */
.mtoc{display:none;background:var(--surface);border:1px solid var(--line);border-radius:14px;margin:0 0 22px}
.mtoc>summary{cursor:pointer;list-style:none;padding:14px 18px;font-family:Sora;font-weight:600;font-size:.93rem;display:flex;align-items:center;gap:10px;min-height:48px}
.mtoc>summary::-webkit-details-marker{display:none}
.mtoc>summary::after{content:"+";margin-left:auto;color:var(--muted);font-size:1.25rem;font-weight:400}
.mtoc[open]>summary::after{content:"\2212"}
.mtoc .links{padding:2px 18px 16px;border-top:1px solid var(--line);display:flex;flex-direction:column}
.mtoc a{color:var(--muted);font-size:.92rem;padding:9px 0;border-bottom:1px solid rgba(255,255,255,.04)}
.mtoc a:last-child{border-bottom:0}
.mtoc a:hover{color:var(--text);text-decoration:none}
@media (max-width:980px){.mtoc{display:block}}

/* horizontal-scroll affordance, added to overflowing tables/figures by script */
.scrollhint{display:none;font-size:.78rem;color:var(--muted);margin:0 0 7px;align-items:center;gap:7px}
.scrollhint.show{display:flex}
.scrollhint::after{content:"\2192";animation:nudge 1.6s ease-in-out infinite}
@keyframes nudge{0%,100%{transform:translateX(0);opacity:.55}50%{transform:translateX(5px);opacity:1}}
.figscroll{overflow-x:auto;-webkit-overflow-scrolling:touch}
.figscroll>svg{display:block}
/* Below this width the chart would shrink past legibility, so hold it at a
   readable size and let the container scroll instead. */
@media (max-width:800px){.figscroll>svg{min-width:660px}}

/* fact strip */
.facts{display:flex;flex-wrap:wrap;gap:10px;margin:26px 0 8px}
.fact{background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:9px 15px;font-size:.85rem;color:var(--muted)}
.fact b{color:var(--text);font-weight:600}

/* callouts */
.box{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:24px 26px;margin:1.9em 0}
.box>:last-child{margin-bottom:0}
.box h3{margin-top:0}
.box.accent{border-color:rgba(124,92,255,.35);background:linear-gradient(180deg,rgba(124,92,255,.09),rgba(124,92,255,.02))}
.box.tag{border-color:rgba(24,211,200,.3);background:linear-gradient(180deg,rgba(24,211,200,.08),transparent)}
.tagline{font-family:Sora;font-weight:600;font-size:1.08rem;color:#fff}

/* key-points list */
.points{list-style:none;padding:0;counter-reset:pt}
.points li{counter-increment:pt;position:relative;padding:18px 0 18px 56px;border-bottom:1px solid var(--line);margin:0}
.points li:last-child{border-bottom:0}
.points li::before{content:counter(pt,decimal-leading-zero);position:absolute;left:0;top:17px;font-family:Sora;font-weight:700;font-size:.82rem;color:var(--brand2);background:var(--surface);border:1px solid var(--line);border-radius:9px;width:38px;height:30px;display:grid;place-items:center}
.points b{display:block;color:#fff;font-family:Sora;font-weight:600;font-size:1.02rem;margin-bottom:4px}
.points span{color:var(--muted);font-size:.95rem}

/* chapters */
.chap{border:1px solid var(--line);border-radius:var(--radius);background:var(--surface);margin-bottom:14px;overflow:hidden}
.chap>summary{cursor:pointer;list-style:none;padding:18px 22px;display:flex;align-items:baseline;gap:14px;font-family:Sora;font-weight:600}
.chap>summary::-webkit-details-marker{display:none}
.chap>summary::after{content:"+";margin-left:auto;color:var(--muted);font-weight:400;font-size:1.3rem;line-height:1}
.chap[open]>summary::after{content:"\2212"}
.chap>summary:hover{background:var(--surface2)}
.chap .n{font-size:.75rem;letter-spacing:.08em;color:var(--brand2);border:1px solid var(--line);border-radius:7px;padding:3px 8px;flex:none}
.chap .body{padding:2px 22px 20px;color:var(--muted);border-top:1px solid var(--line);margin-top:0;padding-top:16px}
.chap .body>:last-child{margin-bottom:0}
.chap .body strong{color:var(--text)}
.part{font-family:Sora;font-size:.76rem;letter-spacing:.12em;text-transform:uppercase;color:var(--muted);margin:34px 0 14px;display:flex;align-items:center;gap:12px}
.part::after{content:"";flex:1;height:1px;background:var(--line)}

/* tables */
.tw{overflow-x:auto;margin:1.6em 0;border:1px solid var(--line);border-radius:14px}
table{border-collapse:collapse;width:100%;font-size:.9rem;min-width:520px}
table.narrow{min-width:0}   /* two-column tables read fine at any width */
th,td{text-align:left;padding:12px 16px;border-bottom:1px solid var(--line);vertical-align:top}
th{font-family:Sora;font-weight:600;font-size:.78rem;letter-spacing:.06em;text-transform:uppercase;color:var(--muted);background:var(--surface2)}
tbody tr:last-child td{border-bottom:0}
td b{color:#fff;font-weight:600}

/* ERRC grid */
.errc{display:grid;grid-template-columns:repeat(2,1fr);gap:12px;margin:1.8em 0}
@media (max-width:620px){.errc{grid-template-columns:1fr}}
.errc div{background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:18px 20px;font-size:.92rem;color:var(--muted)}
.errc h4{font-family:Sora;font-size:.78rem;letter-spacing:.1em;text-transform:uppercase;margin:0 0 9px}
.errc .e h4{color:var(--red)}
.errc .r h4{color:#ffb35c}
.errc .ra h4{color:var(--brand2)}
.errc .c h4{color:var(--ocean2)}
.errc ul{margin:0;padding-left:1.1em}
.errc li{margin-bottom:3px}

/* figure */
figure{margin:2em 0;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:24px}
figcaption{font-size:.83rem;color:var(--muted);margin-top:14px;text-align:center}

/* audio player */
.player{position:sticky;top:64px;z-index:40;background:linear-gradient(180deg,rgba(18,19,31,.97),rgba(13,14,26,.97));backdrop-filter:blur(14px);border:1px solid var(--line);border-radius:var(--radius);padding:18px 20px;margin:0 0 8px}
.player-top{display:flex;align-items:center;gap:16px}
.pbtn{flex:none;width:52px;height:52px;border-radius:50%;border:0;background:var(--grad);color:#0a0b14;cursor:pointer;display:grid;place-items:center;font-size:1.1rem}
.pbtn:hover{filter:brightness(1.09)}
.pmeta{flex:1;min-width:0}
.pmeta .t{font-family:Sora;font-weight:600;font-size:.97rem;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.pmeta .s{font-size:.8rem;color:var(--muted);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.ptime{font-variant-numeric:tabular-nums;font-size:.82rem;color:var(--muted);flex:none}
.prate{flex:none;background:var(--surface2);color:var(--muted);border:1px solid var(--line);border-radius:9px;padding:6px 9px;font:inherit;font-size:.8rem;cursor:pointer}
.pbar{-webkit-appearance:none;appearance:none;width:100%;height:6px;border-radius:99px;background:var(--surface2);margin:15px 0 0;cursor:pointer}
.pbar::-webkit-slider-thumb{-webkit-appearance:none;width:15px;height:15px;border-radius:50%;background:var(--brand2);border:0;cursor:pointer}
.pbar::-moz-range-thumb{width:15px;height:15px;border-radius:50%;background:var(--brand2);border:0;cursor:pointer}
.pchapters{display:flex;flex-wrap:wrap;gap:7px;margin-top:14px;max-height:0;overflow:hidden;transition:max-height .25s}
.player.open .pchapters{max-height:400px}
.pchapters button{background:var(--surface2);border:1px solid var(--line);color:var(--muted);border-radius:999px;padding:6px 12px;font:inherit;font-size:.79rem;cursor:pointer}
.pchapters button:hover{color:var(--text);border-color:var(--brand2)}
.pchapters button.on{color:#0a0b14;background:var(--brand2);border-color:var(--brand2);font-weight:600}
.ptoggle{background:none;border:0;color:var(--muted);font:inherit;font-size:.79rem;cursor:pointer;padding:9px 0 0;text-align:left}
.ptoggle:hover{color:var(--text)}
.pnote{font-size:.78rem;color:var(--muted);margin:10px 0 0}

/* fixed mini player - appears on small screens once playback starts and the
   main player card has scrolled out of view */
.minibar{position:fixed;left:0;right:0;bottom:0;z-index:60;display:none;
  background:rgba(13,14,26,.97);backdrop-filter:blur(14px);border-top:1px solid var(--line);
  padding:10px 14px calc(10px + env(safe-area-inset-bottom,0px));
  transform:translateY(110%);transition:transform .25s ease}
.minibar.on{transform:translateY(0)}
.minibar-row{display:flex;align-items:center;gap:12px}
.minibar .pbtn{width:44px;height:44px}
.minibar .mtitle{flex:1;min-width:0;font-size:.86rem;font-family:Sora;font-weight:600;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.minibar .mtime{font-variant-numeric:tabular-nums;font-size:.78rem;color:var(--muted);flex:none}
.minibar .mprog{height:3px;border-radius:99px;background:var(--surface2);margin-bottom:9px;overflow:hidden}
.minibar .mprog i{display:block;height:100%;width:0;background:var(--grad)}
@media (max-width:860px){.minibar{display:block}body.has-minibar{padding-bottom:74px}}

/* ---------- small screens ---------- */
@media (max-width:860px){
  .player{position:static}
  /* the 150px offset exists to clear the sticky player on desktop; with the
     player in normal flow only the nav needs clearing (scroll-padding-top) */
  .prose h2,.prose h3{scroll-margin-top:14px}
}
@media (max-width:640px){
  html{scroll-padding-top:74px}
  .container{width:min(100% - 28px,var(--maxw))}
  .hero{padding:34px 0 30px}
  .lede{font-size:1.03rem}
  .facts{gap:7px;margin:20px 0 4px}
  .fact{padding:7px 11px;font-size:.79rem}
  .wrap{padding-top:26px}
  .prose h2{margin-top:1.9em}
  .prose blockquote{font-size:1rem;padding-left:16px}
  /* player: bigger touch targets, roomier chapter list */
  .player{padding:16px 15px}
  .pmeta .s{font-size:.78rem}
  .pbtn{width:56px;height:56px}
  .pbar{height:10px;margin-top:16px}
  .pbar::-webkit-slider-thumb{width:22px;height:22px}
  .pbar::-moz-range-thumb{width:22px;height:22px}
  .prate{min-height:40px;min-width:46px}
  .ptoggle{min-height:44px;padding-top:12px}
  .crumbs a{display:inline-block;padding:5px 0}
  .pnote{margin-top:14px}
  .pnote a{display:inline-block;margin-top:6px;padding:10px 16px;border:1px solid var(--line);border-radius:999px;min-height:42px;line-height:22px}
  .pnote a:hover{border-color:var(--brand2);text-decoration:none}
  .player.open .pchapters{max-height:none}
  .pchapters{gap:8px}
  .pchapters button{padding:10px 14px;font-size:.82rem;min-height:42px}
  /* content blocks */
  .points li{padding:15px 0 15px 46px}
  .points li::before{width:34px;height:28px;font-size:.76rem}
  .box{padding:19px 18px}
  figure{padding:16px 14px}
  figcaption{font-size:.79rem;text-align:left}
  .errc div{padding:15px 16px}
  .chap>summary{padding:15px 16px;gap:10px;font-size:.95rem;min-height:52px;align-items:center}
  .chap .body{padding:14px 16px 18px}
  .faq summary{padding:15px 0;font-size:.95rem;min-height:52px}
  th,td{padding:10px 12px}
  .cta{padding:26px 18px;margin-top:40px}
  .cta p:last-child{display:flex;flex-direction:column;gap:10px}
  .cta .btn{width:100%}
  .footer{padding:26px 0;margin-top:48px}
  .footer-inner{flex-direction:column;align-items:flex-start;gap:8px}
  .grid{grid-template-columns:1fr;gap:14px;margin-top:26px}
  .card{padding:20px}
}
@media (max-width:420px){
  .pmeta .t{font-size:.9rem}
  .ptime{font-size:.76rem}
  .fact{font-size:.76rem}
}

/* faq */
.faq{border-bottom:1px solid var(--line)}
.faq summary{cursor:pointer;list-style:none;padding:17px 0;font-family:Sora;font-weight:600;font-size:1rem;display:flex;gap:14px;align-items:flex-start}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";margin-left:auto;color:var(--muted);font-weight:400;font-size:1.25rem;line-height:1.2}
.faq[open] summary::after{content:"\2212"}
.faq .body{padding:0 0 18px;color:var(--muted);font-size:.95rem}
.faq .body>:last-child{margin-bottom:0}

/* cta */
.cta{background:linear-gradient(135deg,rgba(124,92,255,.14),rgba(24,211,200,.08));border:1px solid var(--line);border-radius:var(--radius);padding:34px;margin-top:56px;text-align:center}
.cta h2{margin-bottom:.4em}
.cta p{color:var(--muted);max-width:52ch;margin-inline:auto}
.note{font-size:.82rem;color:var(--muted);border-top:1px solid var(--line);padding-top:20px;margin-top:56px}