/* Byte Garden - one stylesheet for every page */
@font-face{font-family:"Bricolage";src:url(fonts/bricolage-700.woff2) format("woff2");font-weight:700;font-display:swap}
@font-face{font-family:"Bricolage";src:url(fonts/bricolage-800.woff2) format("woff2");font-weight:800;font-display:swap}
@font-face{font-family:"Atkinson";src:url(fonts/atkinson-400.woff2) format("woff2");font-weight:400;font-display:swap}
@font-face{font-family:"Atkinson";src:url(fonts/atkinson-700.woff2) format("woff2");font-weight:700;font-display:swap}
@font-face{font-family:"JBMono";src:url(fonts/jbmono-400.woff2) format("woff2");font-weight:400;font-display:swap}

:root{
  --paper:#FAFCFD; --card:#FFFFFF; --ink:#16233A; --muted:#4A5872; --line:#D5DDE8;
  --blue:#2457D6; --blue-t:#E7EEFD; --turq:#0E8F87; --turq-t:#E3F6F4; --orange:#E2580B; --orange-t:#FDECE1;
  --yellow:#F5B800; --yellow-t:#FFF5D1; --violet:#5B3FC4;
  --course:var(--blue); --course-t:var(--blue-t);
  --radius-s:6px; --radius-m:12px; --radius-l:22px;
  --wrap:1180px;
}
[data-course="igcse"]{--course:var(--turq);--course-t:var(--turq-t)}
[data-course="ib"]{--course:var(--blue);--course-t:var(--blue-t)}
*{box-sizing:border-box}
html{font-family:Atkinson,system-ui,sans-serif;color:var(--ink);background:var(--paper);line-height:1.55;font-size:17px;-webkit-text-size-adjust:100%}
body{margin:0;min-height:100vh;display:flex;flex-direction:column}
main{flex:1}
a{color:var(--blue);text-underline-offset:3px}
a:hover{color:var(--ink)}
:focus-visible{outline:3px solid var(--yellow);outline-offset:2px;border-radius:4px}
h1,h2,h3{font-family:Bricolage,Atkinson,sans-serif;line-height:1.12;margin:0 0 .4em;letter-spacing:-.01em}
h1{font-size:clamp(2rem,4.6vw,3.4rem);font-weight:800}
h2{font-size:clamp(1.35rem,2.4vw,1.75rem);font-weight:800}
h3{font-size:1.15rem;font-weight:700}
p{margin:0 0 .8em;max-width:72ch}
code,pre{font-family:JBMono,ui-monospace,monospace}
.wrap{max-width:var(--wrap);margin:0 auto;padding:0 20px}
.skip{position:absolute;left:-999px}.skip:focus{left:12px;top:12px;background:#fff;padding:8px 12px;z-index:10}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0)}

/* header */
.top{background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:5}
.top .wrap{display:flex;align-items:center;gap:22px;min-height:64px;flex-wrap:wrap}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--ink);font-family:Bricolage;font-weight:800;font-size:1.25rem}
.brand svg{width:34px;height:34px}
.nav{display:flex;gap:4px;flex-wrap:wrap;margin-left:auto}
.nav a{text-decoration:none;color:var(--ink);padding:7px 12px;border-radius:999px;font-weight:700;font-size:.95rem}
.nav a:hover{background:var(--paper)}
.nav a[aria-current="page"]{background:var(--ink);color:#fff}
.nav a.igcse[aria-current="page"]{background:var(--turq)} .nav a.ib[aria-current="page"]{background:var(--blue)}
.topsearch{display:flex}
.topsearch input{width:200px;border:1.5px solid var(--line);border-radius:999px;padding:7px 14px;font:inherit;font-size:.95rem;background:var(--paper)}

/* home */
.hero{padding:56px 0 30px}
.hero h1{font-size:clamp(2.8rem,8vw,5.6rem);line-height:.95;margin-bottom:.25em}
.hero .lede{font-size:1.25rem;color:var(--muted);max-width:40ch}
.hero-grid{display:grid;grid-template-columns:1.25fr .75fr;gap:40px;align-items:end}
.sprout{width:300px;height:282px;justify-self:end;overflow:visible}
.bigsearch{display:flex;gap:8px;margin:26px 0 0;max-width:620px}
.bigsearch input{flex:1;border:2px solid var(--ink);border-radius:var(--radius-m);padding:14px 16px;font:inherit;font-size:1.05rem;background:#fff}
.btn{display:inline-flex;align-items:center;gap:8px;border:2px solid var(--ink);background:var(--ink);color:#fff;border-radius:var(--radius-m);padding:10px 18px;font:inherit;font-weight:700;text-decoration:none;cursor:pointer}
.btn:hover{background:#fff;color:var(--ink)}
.btn.ghost{background:#fff;color:var(--ink)} .btn.ghost:hover{background:var(--paper)}
.btn.small{padding:6px 12px;font-size:.9rem;border-radius:var(--radius-s)}
.doors{display:grid;grid-template-columns:1fr 1fr;gap:22px;margin:34px 0 10px}
.door{border:2px solid var(--ink);border-radius:var(--radius-l);padding:26px 26px 20px;background:var(--course-t);text-decoration:none;color:var(--ink);display:block;position:relative;overflow:hidden}
.door:hover{box-shadow:6px 6px 0 var(--ink);transform:translate(-2px,-2px)}
.door h2{font-size:2rem;margin-bottom:.1em}
.door .spec{color:var(--muted);font-size:.95rem;margin-bottom:14px}
.door ol{list-style:none;margin:0;padding:0;columns:2;column-gap:18px;font-size:.95rem}
.door li{break-inside:avoid;padding:3px 0;display:grid;grid-template-columns:2.4em 1fr}
.door li b{color:var(--course);font-family:Bricolage}
.door .bar{margin-top:16px}
.meter{height:10px;border-radius:99px;background:#fff;border:1.5px solid var(--ink);overflow:hidden;display:flex}
.meter i{display:block;height:100%}
.meter .p{background:var(--course)} .meter .m{background:var(--yellow)}
.meterlabel{font-size:.85rem;color:var(--muted);margin-top:6px}
.section{padding:30px 0}
.packs{display:grid;grid-template-columns:repeat(auto-fill,minmax(270px,1fr));gap:16px}
.packlink{border:1.5px solid var(--ink);border-radius:var(--radius-m);padding:14px 16px;background:#fff;text-decoration:none;color:var(--ink)}
.packlink:hover{background:var(--course-t)}
.packlink small{color:var(--muted);display:block}

/* chips */
.chip{display:inline-flex;align-items:center;gap:5px;font-size:.78rem;font-weight:700;border-radius:999px;padding:2px 9px;border:1.5px solid var(--ink);white-space:nowrap;line-height:1.5;background:#fff}
.chip.sl{border-color:var(--blue);color:var(--blue)}
.chip.hl{background:var(--orange);border-color:var(--orange);color:#fff}
.chip.p1{border-color:var(--turq);color:#0B6E68} .chip.p2{border-color:var(--violet);color:var(--violet)}
.chip.pack{background:var(--turq-t);border-color:var(--turq);color:#0B6E68}
.chip.mat{background:var(--yellow-t);border-color:#8A6400;color:#6B4E00}
.chip.plan{border-color:var(--line);color:var(--muted)}
.chip.teacher{background:var(--ink);color:#fff}
.chip.check{background:var(--yellow);border-color:#8A6400;color:var(--ink)}

/* course page */
.coursehead{background:var(--course-t);border-bottom:2px solid var(--ink);padding:34px 0 24px}
.coursehead p{color:var(--muted)}
.filters{display:flex;flex-wrap:wrap;gap:8px;margin-top:14px;align-items:center}
.seg{display:inline-flex;border:2px solid var(--ink);border-radius:999px;overflow:hidden;background:#fff}
.seg button{border:0;background:none;font:inherit;font-weight:700;padding:6px 14px;cursor:pointer;color:var(--ink)}
.seg button[aria-pressed="true"]{background:var(--ink);color:#fff}
.layout{display:grid;grid-template-columns:240px 1fr;gap:34px;padding:28px 20px 50px}
.unitnav{position:sticky;top:84px;align-self:start;max-height:calc(100vh - 100px);overflow:auto}
.unitnav h2{font-size:.95rem;color:var(--muted);font-family:Atkinson;font-weight:700;margin:12px 0 4px}
.unitnav a{display:flex;gap:8px;text-decoration:none;color:var(--ink);padding:5px 8px;border-radius:8px;font-size:.93rem}
.unitnav a:hover{background:var(--course-t)}
.unitnav a b{color:var(--course);min-width:2.5em;font-family:Bricolage}
.unit{margin-bottom:38px;scroll-margin-top:90px}
.unit header{display:flex;align-items:baseline;gap:12px;flex-wrap:wrap;border-bottom:2px solid var(--ink);padding-bottom:8px;margin-bottom:6px}
.unit header .num{font-family:Bricolage;font-weight:800;font-size:1.6rem;color:var(--course)}
.unit header .hrs{color:var(--muted);font-size:.9rem;margin-left:auto}
.lrow{display:grid;grid-template-columns:5.2em 1fr auto;gap:14px;align-items:center;padding:11px 8px;border-bottom:1px solid var(--line);text-decoration:none;color:var(--ink)}
.lrow:hover{background:var(--course-t)}
.lrow .code{font-family:JBMono;font-size:.85rem;color:var(--muted)}
.lrow .t{font-weight:700}
.lrow .sub{display:block;font-weight:400;font-size:.88rem;color:var(--muted)}
.lrow .tags{display:flex;gap:6px;flex-wrap:wrap;justify-content:flex-end}
.lrow.hidden{display:none}

/* lesson page */
.lessonhead{background:var(--course-t);border-bottom:2px solid var(--ink);padding:26px 0 26px}
.crumbs{font-size:.92rem;margin-bottom:10px} .crumbs a{color:var(--ink)}
.lessonhead h1{font-size:clamp(1.9rem,4vw,2.9rem);max-width:24ch}
.lessonhead .tags{display:flex;gap:8px;flex-wrap:wrap;margin-top:10px}
.lgrid{display:grid;grid-template-columns:1fr 330px;gap:36px;padding:30px 20px 60px}
.block{margin-bottom:34px}
.block > h2{display:flex;align-items:center;gap:10px}
.dot{width:14px;height:14px;border-radius:4px;background:var(--course);display:inline-block;flex:none}
.dot.o{background:var(--orange)} .dot.y{background:var(--yellow)} .dot.b{background:var(--blue)} .dot.v{background:var(--violet)}
.objectives{list-style:none;padding:0;margin:0;counter-reset:o}
.objectives li{counter-increment:o;padding:10px 12px 10px 48px;position:relative;border:1.5px solid var(--line);border-radius:var(--radius-m);margin-bottom:8px;background:#fff}
.objectives li::before{content:counter(o);position:absolute;left:12px;top:9px;width:26px;height:26px;border-radius:50%;background:var(--course);color:#fff;font-weight:700;display:grid;place-items:center;font-size:.85rem}
.vocab{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:10px}
.vocab div{border:1.5px solid var(--ink);border-radius:var(--radius-m);padding:10px 12px;background:#fff}
.vocab dt{font-weight:700;font-family:Bricolage;margin-bottom:2px}
.vocab dd{margin:0;font-size:.92rem;color:var(--muted)}
.res{display:grid;grid-template-columns:44px 1fr auto;gap:12px;align-items:center;border:1.5px solid var(--line);border-radius:var(--radius-m);padding:10px 12px;margin-bottom:8px;background:#fff}
.res.featured{border:2px solid var(--ink)}
.res .ext{width:44px;height:44px;border-radius:10px;display:grid;place-items:center;font-weight:700;font-size:.7rem;color:#fff;background:var(--muted);text-transform:uppercase;font-family:JBMono}
.res .ext.pdf{background:#C2410C} .res .ext.pptx,.res .ext.ppt{background:#B4461A;background:var(--orange)} .res .ext.py{background:var(--violet)} .res .ext.docx{background:var(--blue)} .res .ext.png,.res .ext.jpg{background:var(--turq)}
.res .name{font-weight:700;line-height:1.3}
.res .meta{font-size:.84rem;color:var(--muted);display:flex;gap:6px;flex-wrap:wrap;align-items:center;margin-top:3px}
.res .acts{display:flex;gap:6px;flex-wrap:wrap;justify-content:flex-end}
details.more{margin-top:10px} details.more summary{cursor:pointer;font-weight:700}
.activities{display:grid;gap:10px}
.act{display:grid;grid-template-columns:auto 1fr;gap:12px;border:1.5px solid var(--ink);border-radius:var(--radius-m);padding:12px 14px;background:#fff}
.act .k{font-size:.75rem;font-weight:700;border-radius:999px;padding:2px 9px;align-self:start;border:1.5px solid var(--ink)}
.act.starter .k{background:var(--yellow-t)} .act.guided .k{background:var(--blue-t)} .act.unplugged .k{background:var(--orange-t)} .act.code .k{background:#EFEAFB} .act.exit .k{background:#fff}
.act h3{margin:0 0 2px;font-size:1.05rem}
.act p{margin:0;color:var(--muted)}
.homework{border:2px dashed var(--ink);border-radius:var(--radius-m);padding:14px 16px;background:var(--yellow-t)}
.quiz fieldset{border:1.5px solid var(--line);border-radius:var(--radius-m);padding:12px 14px 8px;margin:0 0 10px;background:#fff}
.quiz legend{font-weight:700;padding:0 4px}
.quiz fieldset{display:grid;grid-template-columns:1fr 1fr;gap:2px 10px}
.quiz fieldset .fb{grid-column:1/-1}
.quiz label{display:flex;gap:8px;align-items:flex-start;padding:5px 6px;border-radius:8px;cursor:pointer}
.quiz label:hover{background:var(--paper)}
.quiz .fb{font-size:.92rem;margin:4px 0 4px;padding:6px 10px;border-radius:8px;display:none}
.quiz .fb.ok{display:block;background:var(--turq-t)} .quiz .fb.no{display:block;background:var(--orange-t)}
.side .panel{border:2px solid var(--ink);border-radius:var(--radius-l);padding:16px 18px;background:#fff;margin-bottom:18px}
.side .panel h2{font-size:1.1rem}
.side dl{margin:0;display:grid;grid-template-columns:auto 1fr;gap:4px 12px;font-size:.93rem}
.side dt{color:var(--muted)} .side dd{margin:0;font-weight:700}
.side ul{margin:0;padding-left:18px;font-size:.93rem}
.empty{border:2px dashed var(--line);border-radius:var(--radius-m);padding:18px;color:var(--muted);background:#fff}
.prevnext{display:flex;justify-content:space-between;gap:12px;border-top:2px solid var(--ink);padding-top:16px;flex-wrap:wrap}

/* preview dialog */
dialog.preview{width:min(1100px,96vw);height:min(90vh,900px);border:2px solid var(--ink);border-radius:var(--radius-l);padding:0;display:none;flex-direction:column}
dialog.preview[open]{display:flex}
dialog.preview::backdrop{background:rgba(22,35,58,.55)}
dialog.preview header{display:flex;gap:10px;align-items:center;padding:10px 14px;border-bottom:1.5px solid var(--line)}
dialog.preview header h2{font-size:1.05rem;margin:0;flex:1}
dialog.preview .body{flex:1;overflow:auto;background:#EEF2F7}
dialog.preview iframe{width:100%;height:100%;border:0;background:#fff}
dialog.preview img{max-width:100%;display:block;margin:0 auto}
dialog.preview pre{margin:0;padding:18px;background:#fff;min-height:100%;font-size:.9rem;line-height:1.5}

/* search + tracker */
.searchbar{display:flex;gap:10px;flex-wrap:wrap;margin:14px 0}
.searchbar input[type=search]{flex:1;min-width:240px;border:2px solid var(--ink);border-radius:var(--radius-m);padding:12px 14px;font:inherit;background:#fff}
.searchbar select{border:2px solid var(--ink);border-radius:var(--radius-m);padding:10px 12px;font:inherit;background:#fff}
.hits{margin-top:10px}
.hit{display:block;padding:12px 10px;border-bottom:1px solid var(--line);text-decoration:none;color:var(--ink)}
.hit:hover{background:var(--course-t)}
.hit .t{font-weight:700}
.hit .s{color:var(--muted);font-size:.9rem}
mark{background:var(--yellow-t);color:inherit;border-radius:3px;padding:0 2px}
.tablewrap{overflow-x:auto;border:2px solid var(--ink);border-radius:var(--radius-m);background:#fff}
table.tracker{border-collapse:collapse;width:100%;font-size:.88rem}
table.tracker th,table.tracker td{padding:7px 9px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top}
table.tracker th{position:sticky;top:0;background:#E9EEF5;font-family:Bricolage;white-space:nowrap}
table.tracker td.c{text-align:center}
.yes{color:#0B6E68;font-weight:700}
.summary{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:12px;margin:12px 0 20px}
.summary div{border:1.5px solid var(--ink);border-radius:var(--radius-m);padding:12px;background:#fff}
.summary b{font-family:Bricolage;font-size:1.8rem;display:block;line-height:1}
.note{border-left:0;border:1.5px solid #8A6400;background:var(--yellow-t);border-radius:var(--radius-m);padding:12px 14px;margin:12px 0}
.prose{max-width:760px}
.prose h2{margin-top:1.6em}
.prose ol li,.prose ul li{margin-bottom:.4em}
.prose pre{background:#fff;border:1.5px solid var(--line);border-radius:8px;padding:10px 12px;overflow:auto}

/* footer */
.foot{border-top:1px solid var(--line);background:#fff;padding:22px 0;font-size:.88rem;color:var(--muted);margin-top:30px}
.foot .wrap{display:flex;gap:18px;flex-wrap:wrap;justify-content:space-between;align-items:center}
.foot label{display:inline-flex;gap:6px;align-items:center;cursor:pointer}
body.teacher .t-only{display:revert}
.t-only{display:none}

@media (max-width:900px){
  .quiz fieldset{grid-template-columns:1fr}
  .hero-grid,.doors,.lgrid{grid-template-columns:1fr}
  .sprout{display:none}
  .layout{grid-template-columns:1fr;padding:20px 16px 40px}
  .unitnav{position:static;max-height:none;display:flex;flex-wrap:wrap;gap:4px}
  .unitnav h2{width:100%}
  .lrow{grid-template-columns:1fr;gap:4px}
  .lrow .tags{justify-content:flex-start}
  .topsearch{display:none}
  .door ol{columns:1}
  .res{grid-template-columns:40px 1fr}
  .res .acts{grid-column:1 / -1;justify-content:flex-start}
  .wrap{padding:0 16px}
}
@media (prefers-reduced-motion:no-preference){
  .sprout .grow{transform-box:fill-box;transform-origin:50% 100%;animation:grow 1.1s cubic-bezier(.2,.8,.2,1) both}
  .sprout .leaf1{animation-delay:.5s} .sprout .leaf2{animation-delay:.75s}
  @keyframes grow{from{transform:scale(0)}to{transform:scale(1)}}
  .door{transition:transform .15s,box-shadow .15s}
}
@media print{.top,.foot,.unitnav,.acts{display:none}.lgrid{grid-template-columns:1fr}}

/* revision page */
.revhead{background:var(--yellow-t)}
.howrev{display:flex;flex-wrap:wrap;gap:8px 22px;list-style:none;padding:0;margin:14px 0 0;color:var(--muted)}
.howrev b{color:var(--ink)}
.revsec{margin-bottom:34px}
.revsec h2{border-bottom:3px solid var(--course);padding-bottom:6px;margin-bottom:6px}
.revsec .muted{color:var(--muted);margin-bottom:16px}
.revgrid{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:16px}
.revcard{border:2px solid var(--ink);border-radius:var(--radius-m);background:#fff;padding:16px 16px 14px;display:flex;flex-direction:column;gap:4px;border-top:10px solid var(--course)}
.revcard .rnum{font-family:Bricolage;font-weight:800;color:var(--course);font-size:.95rem}
.revcard h3{font-size:1.2rem;line-height:1.2;margin:0}
.revcard .rsub{color:var(--muted);font-size:.9rem;margin:0 0 8px}
.revcard .racts{display:flex;flex-wrap:wrap;gap:8px;align-items:center;margin-top:auto}
.revcard .rlink{flex-basis:100%;font-size:.9rem;color:var(--ink);margin-top:4px}

.rstatus{font-size:.82rem;font-weight:700;margin:.2rem 0 .5rem;display:inline-block;padding:.1rem .55rem;border-radius:999px;border:1.5px solid #16233A}
.rstatus.done{background:#E3F6F4}.rstatus.soon{background:#fff;color:#4A5872;border-style:dashed}
.racts .rlab{font-size:.78rem;font-weight:700;min-width:5.5rem;display:inline-block;color:#4A5872}
.revcard .racts{margin-top:.35rem}