:root{
  --bg:#0E1320; --panel:#161D2E; --panel-2:#1C2539; --line:#2A3448;
  --text:#E9EDF5; --muted:#A3AEC2; --off:#2B3549;
  --cs:#4C9AFF; --ict:#F5A524; --accent:var(--cs);
  --on-accent:#0E1320; --nav-bg:rgba(14,19,32,.92); --code-bg:#0A0F1A; --code-text:#D6E2F5;
  --pattern:linear-gradient(var(--line) 1px,transparent 1px),linear-gradient(90deg,var(--line) 1px,transparent 1px); --pattern-size:32px 32px;
  --mono:"JetBrains Mono",ui-monospace,Menlo,Consolas,monospace;
  --sans:"IBM Plex Sans",system-ui,-apple-system,"Segoe UI",sans-serif;
}
:root[data-subject="ict"]{--accent:var(--ict)}
*{box-sizing:border-box}
html,body{margin:0;background:var(--bg);color:var(--text);font-family:var(--sans);-webkit-font-smoothing:antialiased}
body{min-height:100vh;background-image:var(--pattern);background-size:var(--pattern-size);background-attachment:fixed}
body::before{content:"";position:fixed;inset:0;background:radial-gradient(ellipse at top,transparent 0,var(--bg) 70%);pointer-events:none;z-index:0}
.app{position:relative;z-index:1;max-width:560px;margin:0 auto;padding:16px 16px 96px;display:flex;flex-direction:column;gap:18px}
button{font:inherit;color:inherit;cursor:pointer}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:8px}

/* top bar */
.top{display:flex;align-items:center;justify-content:space-between;padding-top:4px}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--text)}
.mark{width:40px;height:40px;border-radius:11px;background:var(--panel-2);border:1px solid var(--line);display:flex;align-items:flex-end;justify-content:center;gap:2px;padding:8px 7px}
.mark i{display:block;width:2px;border-radius:1px;background:var(--muted)}
.mark i:last-child{background:var(--accent)}
.word{font-family:var(--mono);font-weight:800;font-size:19px;letter-spacing:-.5px}
.word b{color:var(--accent);font-weight:800}
.icon-btn{width:44px;height:44px;border-radius:12px;background:var(--panel);border:1px solid var(--line);display:grid;place-items:center}
.icon-btn svg{width:20px;height:20px}

/* greeting */
.prompt{font-family:var(--mono);font-size:15px;color:var(--muted);margin:4px 0 0}
.prompt .acc{color:var(--accent)}
.cursor{display:inline-block;width:9px;height:17px;background:var(--accent);vertical-align:-3px;margin-left:3px;animation:blink 1.1s steps(1) infinite}
@keyframes blink{50%{opacity:0}}
h1{font-family:var(--mono);font-size:26px;line-height:1.2;margin:2px 0 0;letter-spacing:-.6px}

/* subject switch */
.switch{display:grid;grid-template-columns:1fr 1fr;gap:6px;background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:5px}
.switch button{border:0;border-radius:10px;padding:10px 8px;min-height:52px;background:transparent;display:flex;flex-direction:column;align-items:center;gap:1px;color:var(--muted)}
.switch button .s1{font-weight:600;font-size:15px}
.switch button .s2{font-family:var(--mono);font-size:11px}
.switch button[aria-pressed="true"]{background:var(--accent);color:var(--on-accent)}

/* overall card */
.overall{background:var(--panel);border:1px solid var(--line);border-radius:18px;padding:16px 18px;display:flex;align-items:center;gap:18px}
.big{font-family:var(--mono);font-weight:800;font-size:58px;line-height:1;color:var(--accent);min-width:74px;text-align:center}
.big small{display:block;font-size:12px;font-weight:500;color:var(--muted);margin-top:4px}
.overall .info{flex:1;min-width:0}
.overall .label{font-size:13px;color:var(--muted)}
.overall .title{font-weight:600;font-size:17px;margin:2px 0 10px}
.meter{display:flex;gap:4px}
.meter span{flex:1;height:10px;border-radius:3px;background:var(--off)}
.meter span.on{background:var(--accent)}
.next{font-size:13px;color:var(--muted);margin-top:8px}

/* chapters */
.sec{display:flex;justify-content:space-between;align-items:baseline}
.sec h2{font-family:var(--mono);font-size:13px;font-weight:700;letter-spacing:1.5px;text-transform:uppercase;color:var(--muted);margin:0}
.sec span{font-size:12px;color:var(--muted)}
.chapters{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:8px}
.chap{width:100%;text-align:left;background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:12px 14px;display:grid;grid-template-columns:34px 1fr auto;grid-template-rows:auto auto;column-gap:12px;row-gap:8px;align-items:center;transition:border-color .15s,transform .15s}
.chap:hover{border-color:var(--accent);transform:translateY(-1px)}
.chap .num{grid-row:1/3;font-family:var(--mono);font-weight:700;font-size:15px;color:var(--accent);width:34px;height:34px;border-radius:9px;background:var(--panel-2);display:grid;place-items:center}
.chap .name{font-weight:500;font-size:15px}
.chap .lv{font-family:var(--mono);font-size:12px;font-weight:700;background:var(--panel-2);border:1px solid var(--line);border-radius:999px;padding:3px 9px;white-space:nowrap}
.chap .bars{grid-column:2/4;display:flex;gap:3px}
.chap .bars span{flex:1;height:6px;border-radius:2px;background:var(--off)}
.chap .bars span.on{background:var(--accent)}

/* cta */
.cta{display:flex;align-items:center;justify-content:center;gap:10px;width:100%;min-height:54px;border:0;border-radius:14px;background:var(--accent);color:var(--on-accent);font-weight:600;font-size:16px}
.cta svg{width:20px;height:20px}
.note{font-size:12px;color:var(--muted);text-align:center;margin:0}

/* bottom nav */
nav{position:fixed;left:0;right:0;bottom:0;z-index:2;background:var(--nav-bg);backdrop-filter:blur(8px);border-top:1px solid var(--line)}
nav ul{list-style:none;margin:0 auto;padding:6px 8px calc(6px + env(safe-area-inset-bottom));max-width:560px;display:grid;grid-template-columns:repeat(4,1fr)}
nav button{width:100%;min-height:56px;background:none;border:0;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:3px;color:var(--muted);font-size:11px}
nav button svg{width:22px;height:22px}
nav button[aria-current="page"]{color:var(--accent)}

@media (min-width:760px){
  .app{max-width:880px;padding:28px 28px 110px;display:grid;grid-template-columns:1fr 1fr;column-gap:28px;row-gap:18px;align-items:start}
  .top,.hello{grid-column:1/3}
  .left{display:flex;flex-direction:column;gap:18px}
  .right{display:flex;flex-direction:column;gap:12px}
  nav ul{max-width:880px}
}
@media (max-width:759px){.left,.right{display:contents}}

/* ---------- level map illustration ---------- */
.hero{margin:0;position:relative;background:var(--panel);border:1px solid var(--line);border-radius:20px;padding:10px 8px 4px;overflow:hidden}
.hero::after{content:"";position:absolute;inset:0;background:radial-gradient(circle at 85% 50%,color-mix(in srgb,var(--accent) 18%,transparent),transparent 55%);pointer-events:none}
.hero svg{display:block;width:100%;height:auto}
.hero .cap{position:relative;z-index:1;display:flex;justify-content:space-between;font-family:var(--mono);font-size:11px;color:var(--muted);padding:0 10px 8px}
.map-path{fill:none;stroke:var(--off);stroke-width:3;stroke-linecap:round}
.map-trace{fill:none;stroke:var(--accent);stroke-width:3;stroke-linecap:round;stroke-dasharray:var(--len);stroke-dashoffset:var(--len);animation:draw 1.8s cubic-bezier(.6,0,.3,1) .4s forwards}
@keyframes draw{to{stroke-dashoffset:0}}
@keyframes show{to{opacity:1}}
.lvl-line{stroke:var(--line);stroke-width:1;stroke-dasharray:3 5}
.lvl-num{fill:var(--muted);font-family:var(--mono);font-size:10px;text-anchor:middle;opacity:.7}
.flag{fill:none;stroke:var(--accent);stroke-width:2;stroke-linejoin:round}
.map-path,.map-trace{stroke-linejoin:round}
.node-bg{fill:var(--panel-2);stroke:var(--line);stroke-width:2}
.ring{fill:none;stroke:var(--accent);stroke-width:3;stroke-linecap:round;transform:rotate(-90deg);transform-box:fill-box;transform-origin:center;stroke-dasharray:132;stroke-dashoffset:132;transition:stroke-dashoffset 1s cubic-bezier(.4,0,.2,1)}
.icon{fill:none;stroke:var(--text);stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}
.icon text{fill:var(--text);stroke:none;font-family:var(--mono);font-weight:700}
.node{opacity:0;animation:nodeIn .5s cubic-bezier(.3,1.5,.5,1) forwards}
@keyframes nodeIn{from{opacity:0;transform:scale(.4)}to{opacity:1;transform:none}}
.node{transform-box:fill-box;transform-origin:center}
.node .float{animation:bob 3.2s ease-in-out infinite}
@keyframes bob{50%{transform:translateY(-3px)}}
.ulabel{fill:var(--muted);font-family:var(--mono);font-size:10px;font-weight:700;text-anchor:middle}
.goal-hex{fill:var(--accent);filter:drop-shadow(0 0 8px var(--accent))}
.goal-9{fill:var(--on-accent);font-family:var(--mono);font-weight:800;font-size:22px;text-anchor:middle}
.goal{animation:goalPulse 2.6s ease-in-out 2.4s infinite;transform-box:fill-box;transform-origin:center}
@keyframes goalPulse{50%{transform:scale(1.08)}}
.bit{fill:var(--accent);font-family:var(--mono);font-size:11px;opacity:0;animation:bitFloat 6s linear infinite}
@keyframes bitFloat{0%{opacity:0;transform:translateY(0)}15%{opacity:.35}80%{opacity:.15}100%{opacity:0;transform:translateY(-40px)}}
.packet{opacity:0;animation:show 0s forwards;fill:var(--accent);filter:drop-shadow(0 0 4px var(--accent))}
@media (min-width:760px){.hero{grid-column:1/3}.hero svg{max-height:250px;margin:0 auto}}

/* ---------- animation ---------- */
@property --accent{syntax:"<color>";inherits:true;initial-value:#4C9AFF}
html{transition:--accent .45s ease}

/* background grid drifts slowly */
body{animation:drift 40s linear infinite}
@keyframes drift{to{background-position:32px 32px,32px 32px}}

/* page sections rise in one after another */
.reveal{opacity:0;animation:rise .6s cubic-bezier(.2,.8,.2,1) forwards;animation-delay:calc(var(--d,0) * 110ms)}
@keyframes rise{from{opacity:0;transform:translateY(14px)}to{opacity:1;transform:none}}

/* logo bars grow like a level meter, last bar glows */
.mark i{transform-origin:bottom;transform:scaleY(0);animation:grow .5s cubic-bezier(.3,1.5,.5,1) forwards}
.mark i:nth-child(1){animation-delay:.10s}.mark i:nth-child(2){animation-delay:.16s}
.mark i:nth-child(3){animation-delay:.22s}.mark i:nth-child(4){animation-delay:.28s}
.mark i:nth-child(5){animation-delay:.34s}.mark i:nth-child(6){animation-delay:.40s}
.mark i:nth-child(7){animation-delay:.46s}
.mark i:nth-child(8){animation:grow .5s cubic-bezier(.3,1.5,.5,1) .52s forwards,glow 2.4s ease-in-out 1.2s infinite}
@keyframes grow{to{transform:scaleY(1)}}
@keyframes glow{0%,100%{box-shadow:0 0 0 transparent}50%{box-shadow:0 0 8px var(--accent)}}
.word b{display:inline-block;animation:pop .5s cubic-bezier(.3,1.6,.5,1) .7s both}
@keyframes pop{from{transform:scale(0) rotate(-20deg)}to{transform:none}}

/* subject switch: a pill slides between the two options */
.switch{position:relative}
.switch .pill{position:absolute;top:5px;bottom:5px;left:5px;width:calc(50% - 8px);border-radius:10px;background:var(--accent);transition:transform .35s cubic-bezier(.4,1.3,.5,1);box-shadow:0 4px 18px -6px var(--accent)}
:root[data-subject="ict"] .switch .pill{transform:translateX(calc(100% + 6px))}
.switch button{position:relative;z-index:1;transition:color .3s}
.switch button[aria-pressed="true"]{background:transparent}

/* level segments fill one by one */
.meter span.on,.chap .bars span.on{transform-origin:left;animation:fill .35s ease-out both;animation-delay:calc(var(--i) * 60ms + var(--base,0ms))}
@keyframes fill{from{transform:scaleX(0);opacity:.2}to{transform:none;opacity:1}}

/* unit cards slide in */
.chapters li{opacity:0;animation:slide .45s cubic-bezier(.2,.8,.2,1) forwards;animation-delay:calc(var(--i) * 70ms)}
@keyframes slide{from{opacity:0;transform:translateX(18px)}to{opacity:1;transform:none}}
.chap .lv{transition:background .2s,color .2s}
.chap:hover .lv{background:var(--accent);color:var(--on-accent);border-color:var(--accent)}
.chap:hover .num{animation:wiggle .4s}
@keyframes wiggle{30%{transform:rotate(-8deg)}60%{transform:rotate(6deg)}}

/* overall number pops when it changes */
.big.bump{animation:bump .45s cubic-bezier(.3,1.6,.5,1)}
@keyframes bump{40%{transform:scale(1.12)}}

/* light sweep across the main button */
.cta{position:relative;overflow:hidden;transition:transform .15s}
.cta:hover{transform:translateY(-2px)}
.cta:active{transform:scale(.98)}
.cta::after{content:"";position:absolute;top:0;bottom:0;width:40%;left:-60%;background:linear-gradient(100deg,transparent,rgba(255,255,255,.45),transparent);animation:sweep 3.5s ease-in-out 1.5s infinite}
@keyframes sweep{0%{left:-60%}35%,100%{left:130%}}
.cta svg{transition:transform .4s}
.cta:hover svg{transform:rotate(180deg)}

/* bottom menu icons lift */
nav button svg{transition:transform .2s}
nav button:hover svg{transform:translateY(-3px)}

@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation:none !important;transition:none !important}
  .reveal,.chapters li{opacity:1}
  .mark i{transform:none}
}

/* ======================================================
   App views (units, questions, papers, badges)
   ====================================================== */
[hidden]{display:none !important}
.view{position:relative;z-index:1;max-width:880px;margin:0 auto;padding:16px 16px 110px;display:flex;flex-direction:column;gap:16px;animation:viewIn .35s cubic-bezier(.2,.8,.2,1)}
@keyframes viewIn{from{opacity:0;transform:translateY(10px)}to{opacity:1;transform:none}}
.bar{display:flex;align-items:center;gap:10px}
.back{min-width:44px;height:44px;border-radius:12px;background:var(--panel);border:1px solid var(--line);display:inline-flex;align-items:center;justify-content:center;gap:6px;padding:0 12px;color:var(--text);text-decoration:none;font-size:14px}
.back svg{width:18px;height:18px}
.crumb{font-family:var(--mono);font-size:12px;color:var(--muted);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.vh{font-family:var(--mono);font-size:24px;line-height:1.2;margin:0;letter-spacing:-.5px}
.sub{color:var(--muted);font-size:14px;margin:0}
.card{background:var(--panel);border:1px solid var(--line);border-radius:16px;padding:14px 16px}

/* unit header */
.uhead{display:flex;align-items:center;gap:16px}
.uhead .big{font-size:46px;min-width:60px}
.uhead .info{flex:1;min-width:0}
.stats{display:flex;gap:14px;flex-wrap:wrap;font-size:13px;color:var(--muted);margin-top:8px}
.stats b{color:var(--text);font-weight:600}

/* filters */
.filters{display:flex;gap:8px;flex-wrap:wrap}
.chip{border:1px solid var(--line);background:var(--panel);color:var(--muted);border-radius:999px;padding:8px 14px;min-height:40px;font-size:13px;font-weight:500}
.chip[aria-pressed="true"]{background:var(--accent);border-color:var(--accent);color:var(--on-accent)}

/* question list */
.spec-group{display:flex;flex-direction:column;gap:8px}
.spec-title{display:flex;gap:10px;align-items:baseline;margin:8px 0 2px}
.spec-title code{font-family:var(--mono);font-size:12px;color:var(--accent);font-weight:700}
.spec-title span{font-size:14px;font-weight:600}
.qrow{display:grid;grid-template-columns:auto 1fr auto;gap:12px;align-items:center;background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:10px 12px;text-decoration:none;color:var(--text);transition:border-color .15s,transform .15s}
.qrow:hover{border-color:var(--accent);transform:translateX(3px)}
.qid{font-family:var(--mono);font-weight:700;font-size:13px;color:var(--accent);min-width:52px}
.qsrc{font-size:14px}
.qsrc small{display:block;color:var(--muted);font-size:12px;margin-top:2px}
.qside{display:flex;flex-direction:column;align-items:flex-end;gap:4px}
.diff{font-family:var(--mono);font-size:11px;font-weight:700;border-radius:6px;padding:2px 7px;border:1px solid var(--line);color:var(--muted)}
.diff{display:inline-flex;align-items:center;gap:4px;white-space:nowrap}
.diff svg{width:13px;height:13px;fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round;stroke-linejoin:round}
.diff.F{color:#9BE7C0;border-color:#2F5A45}
.diff.B{color:#FFE27A;border-color:#6A5A22}
.diff.S{color:#FF9F6B;border-color:#6E3E26}
.diff.X{color:#FF8FB1;border-color:#6E2A40;background:#2A1520}
.legend{font-size:12px}.legend b{color:var(--text);font-weight:600}
.score{font-family:var(--mono);font-size:12px;color:var(--muted)}
.score.done{color:var(--text)}
.score.full{color:var(--accent);font-weight:700}
.empty{color:var(--muted);text-align:center;padding:30px 10px}

/* question view */
.meta{display:flex;gap:8px;flex-wrap:wrap}
.meta .tag{font-size:12px;border:1px solid var(--line);background:var(--panel-2);border-radius:999px;padding:4px 10px;color:var(--muted)}
.meta .tag b{color:var(--text);font-weight:600}
.paper{background:#fff;border-radius:14px;padding:14px;display:flex;flex-direction:column;gap:10px;box-shadow:0 10px 30px -18px #000}
.paper img{display:block;width:100%;height:auto;max-width:900px;margin:0 auto}
.code{background:var(--code-bg);border:1px solid var(--line);border-radius:12px;overflow:hidden}
.code header{display:flex;justify-content:space-between;align-items:center;padding:8px 12px;border-bottom:1px solid var(--line);font-family:var(--mono);font-size:12px;color:var(--muted)}
.code pre{margin:0;padding:12px;overflow-x:auto;font-family:var(--mono);font-size:13px;line-height:1.55;color:var(--code-text);counter-reset:ln}
.code pre span{display:block;white-space:pre}
.code pre span::before{counter-increment:ln;content:counter(ln);display:inline-block;width:2.4em;margin-right:12px;text-align:right;color:#4C5A73}
.small-btn{border:1px solid var(--line);background:var(--panel-2);border-radius:8px;padding:6px 10px;font-size:12px;min-height:32px}
.hint{font-size:13px;color:var(--muted);background:var(--panel);border:1px dashed var(--line);border-radius:12px;padding:10px 12px}
details.scen{background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:4px 14px}
details.scen summary{cursor:pointer;padding:10px 0;font-weight:600;min-height:44px;display:flex;align-items:center}
details.scen .paper{margin-bottom:12px}
label.lbl{font-weight:600;font-size:14px}
textarea{width:100%;min-height:110px;resize:vertical;background:var(--panel);color:var(--text);border:1px solid var(--line);border-radius:12px;padding:12px;font:15px/1.5 var(--sans)}
textarea:focus{outline:2px solid var(--accent);outline-offset:1px}
.primary{display:flex;align-items:center;justify-content:center;gap:8px;width:100%;min-height:52px;border:0;border-radius:14px;background:var(--accent);color:var(--on-accent);font-weight:600;font-size:16px}
.secondary{display:flex;align-items:center;justify-content:center;gap:8px;min-height:48px;border:1px solid var(--line);border-radius:14px;background:var(--panel);color:var(--text);font-weight:500;font-size:15px;padding:0 16px;text-decoration:none}
.ms{display:flex;flex-direction:column;gap:12px;animation:viewIn .4s}
.ms h3{margin:0;font-family:var(--mono);font-size:14px;letter-spacing:1px;text-transform:uppercase;color:var(--accent)}
.marks{display:flex;flex-wrap:wrap;gap:8px}
.mk{min-width:48px;min-height:48px;border-radius:12px;border:1px solid var(--line);background:var(--panel);font-family:var(--mono);font-weight:700;font-size:16px}
.mk[aria-pressed="true"]{background:var(--accent);border-color:var(--accent);color:var(--on-accent)}
.range{display:flex;align-items:center;gap:14px}
.range input{flex:1;accent-color:var(--accent);height:32px}
.range output{font-family:var(--mono);font-weight:800;font-size:22px;min-width:76px;text-align:right}
.navrow{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.saved{color:var(--muted);font-size:13px;text-align:center}

/* toast + level up */
.toast{position:fixed;left:50%;bottom:92px;transform:translateX(-50%) translateY(20px);opacity:0;z-index:5;background:var(--panel-2);border:1px solid var(--accent);color:var(--text);border-radius:12px;padding:12px 16px;font-size:14px;transition:all .3s;pointer-events:none;max-width:calc(100% - 32px)}
.toast.show{opacity:1;transform:translateX(-50%)}
.lvlup{position:fixed;inset:0;z-index:6;display:grid;place-items:center;background:rgba(8,11,20,.7);backdrop-filter:blur(4px);animation:viewIn .25s}
.lvlup .box{text-align:center;padding:28px 34px;background:var(--panel);border:1px solid var(--accent);border-radius:22px;box-shadow:0 0 50px -10px var(--accent)}
.lvlup .n{font-family:var(--mono);font-weight:800;font-size:84px;line-height:1;color:var(--accent);animation:pop .6s cubic-bezier(.3,1.6,.5,1)}
.lvlup p{margin:8px 0 0;font-family:var(--mono)}
.lvlup small{display:block;color:var(--muted);margin-top:6px}

/* papers + badges */
.grid2{display:grid;grid-template-columns:repeat(auto-fill,minmax(160px,1fr));gap:10px}
.tile{background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:14px;text-decoration:none;color:var(--text);display:flex;flex-direction:column;gap:6px;transition:border-color .15s,transform .15s}
a.tile:hover{border-color:var(--accent);transform:translateY(-2px)}
.tile b{font-size:15px}
.tile span{font-size:12px;color:var(--muted)}
.badge{align-items:center;text-align:center}
.badge .ic{width:56px;height:56px;border-radius:50%;display:grid;place-items:center;background:var(--panel-2);border:1px solid var(--line);margin-bottom:4px}
.badge .ic svg{width:28px;height:28px;stroke:var(--muted)}
.badge.got{border-color:var(--accent)}
.badge.got .ic{background:var(--accent);border-color:var(--accent);box-shadow:0 0 20px -4px var(--accent)}
.badge.got .ic svg{stroke:var(--on-accent)}
.badge:not(.got){opacity:.6}

/* unit list extras on home */
.chap .done{font-size:12px;color:var(--muted)}

/* settings dialog */
dialog{background:var(--panel);color:var(--text);border:1px solid var(--line);border-radius:18px;padding:20px;max-width:420px;width:calc(100% - 32px)}
dialog::backdrop{background:rgba(5,8,15,.7)}
dialog h2{margin:0 0 8px;font-family:var(--mono);font-size:18px}
dialog p{color:var(--muted);font-size:14px;line-height:1.5}
dialog .row{display:flex;gap:10px;flex-wrap:wrap;margin-top:14px}
.danger{border:1px solid #7A2E2E;background:#2A1416;color:#FFB4B4;border-radius:12px;min-height:44px;padding:0 14px}
footer.credit{position:relative;z-index:1;text-align:center;font-size:12px;color:var(--muted);padding:0 16px 100px}
@media (min-width:760px){.view{padding:28px 28px 120px}}
nav a.navb{width:100%;min-height:56px;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:3px;color:var(--muted);font-size:11px;text-decoration:none}
nav a.navb svg{width:22px;height:22px;transition:transform .2s}
nav a.navb:hover svg{transform:translateY(-3px)}
nav a.navb[aria-current="page"]{color:var(--accent)}
.chap{text-decoration:none;color:var(--text)}

/* ---------- working level, next level, level check ---------- */
.lv.check{background:var(--accent);color:var(--on-accent);border-color:var(--accent)}
.nextlv{display:flex;flex-direction:column;gap:10px;border-color:color-mix(in srgb,var(--accent) 55%,var(--line));background:linear-gradient(180deg,color-mix(in srgb,var(--accent) 10%,var(--panel)),var(--panel))}
.nextlv h2{margin:0;font-family:var(--mono);font-size:18px}
.nextlv p{margin:0;font-size:14px;line-height:1.5;color:var(--muted)}
.nextlv p b{color:var(--text)}
.nextlv a.primary{text-decoration:none}
.nextlv.top{border-color:var(--accent);box-shadow:0 0 30px -12px var(--accent)}
.row2{display:grid;grid-template-columns:1fr auto;gap:10px;align-items:stretch}
.row2 .secondary{white-space:nowrap}
.fine{font-size:12px !important;opacity:.85}
.lvpath{display:flex;align-items:center;gap:12px;font-family:var(--mono);font-weight:800}
.lvpath .from,.lvpath .to{width:48px;height:48px;border-radius:12px;display:grid;place-items:center;font-size:24px;border:1px solid var(--line);background:var(--panel-2)}
.lvpath .to{background:var(--accent);color:var(--on-accent);border-color:var(--accent);animation:goalPulse 2.4s ease-in-out infinite}
.lvpath .arrow{flex:0 0 46px;height:3px;border-radius:2px;background:linear-gradient(90deg,var(--line),var(--accent));position:relative}
.lvpath .arrow::after{content:"";position:absolute;right:-2px;top:-5px;border:6px solid transparent;border-left:8px solid var(--accent)}
.lvpath .tgt{margin-left:auto;display:flex;gap:6px}
.lvpath .tgt .small-btn{min-width:40px;min-height:40px;font-size:18px}
.checkbar{display:flex;align-items:center;gap:10px;flex-wrap:wrap;background:var(--panel);border:1px solid var(--accent);border-radius:12px;padding:10px 12px;font-size:14px}
.checkbar b{color:var(--accent);font-family:var(--mono)}
.checkbar .dots{display:flex;gap:5px;margin-left:auto}
.checkbar .dots i{width:10px;height:10px;border-radius:50%;background:var(--off)}
.checkbar .dots i.done{background:var(--accent)}
.checkbar .dots i.now{outline:2px solid var(--text);outline-offset:1px}
.result{display:flex;flex-direction:column;gap:14px;align-items:stretch;text-align:center}
.result .bignum{font-family:var(--mono);font-weight:800;font-size:96px;line-height:1;color:var(--accent);animation:pop .7s cubic-bezier(.3,1.6,.5,1)}
.result p{margin:0;color:var(--muted);font-size:14px;line-height:1.5}
.result p b{color:var(--text)}
.bands{width:100%;border-collapse:collapse;font-size:14px;text-align:left}
.bands th{font-weight:700;text-align:center;color:var(--muted);font-size:12px;padding:6px;border-bottom:1px solid var(--line)}
.bands td{padding:8px 6px;border-bottom:1px solid var(--line)}
.bands td:nth-child(2),.bands td:nth-child(3){text-align:center;font-family:var(--mono);font-size:13px}
.next a{color:var(--accent)}
a.primary{text-decoration:none}

/* ---------- Ask Gemini ---------- */
.gem{border:1px solid var(--line);background:var(--panel);border-radius:14px;padding:14px;display:flex;flex-direction:column;gap:10px}
.gem h4{margin:0;display:flex;align-items:center;gap:8px;font-size:15px}
.gem h4 svg{width:20px;height:20px;fill:var(--accent)}
.gem p{margin:0;font-size:14px;color:var(--muted);line-height:1.5}
.gem ol{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:8px}
.gem .secondary{width:100%;justify-content:flex-start;text-align:left;font-size:14px}

/* ---- install, streak, weekly goal, fix my mistakes, badge pop-up */
.top-r{display:flex;align-items:center;gap:8px}
.install-btn{display:inline-flex;align-items:center;gap:6px;min-height:40px;padding:0 12px;border:1px solid var(--accent);border-radius:12px;background:transparent;color:var(--accent);font-weight:600;font-size:13px}
.install-btn svg{width:16px;height:16px}
.install-btn[hidden]{display:none}
.streak{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.streak>div{background:var(--panel);border:1px solid var(--line);border-radius:16px;padding:12px 14px;min-width:0}
.st-a{display:flex;align-items:center;gap:10px}
.st-a svg{width:30px;height:30px;flex:none;stroke:var(--muted)}
.st-a.on svg{stroke:#FF9F6B;fill:rgba(255,159,107,.18);animation:flick 1.8s ease-in-out infinite}
.st-a b,.st-h b{display:block;font-family:var(--mono);font-size:15px}
.st-a span,.st-b>span{display:block;font-size:12px;color:var(--muted);line-height:1.35;margin-top:2px}
.st-h{display:flex;justify-content:space-between;align-items:baseline;font-size:12px;color:var(--muted)}
.goalbar{height:8px;border-radius:99px;background:var(--off);overflow:hidden;margin:8px 0 6px}
.goalbar i{display:block;height:100%;border-radius:inherit;background:var(--accent);transition:width .8s cubic-bezier(.2,.8,.2,1)}
@keyframes flick{0%,100%{transform:scale(1) rotate(0)}50%{transform:scale(1.08) rotate(-3deg)}}
.fixbtn{display:flex;align-items:center;justify-content:center;gap:10px;min-height:48px;border:1px solid var(--line);border-radius:14px;background:var(--panel);color:var(--text);font-weight:500;font-size:15px;text-decoration:none}
.fixbtn[hidden]{display:none}
.fixbtn svg{width:18px;height:18px;color:var(--accent)}
.fixbtn b{font-family:var(--mono);background:var(--accent);color:var(--on-accent);border-radius:99px;padding:1px 9px;font-size:13px}
.badgepop .box{display:flex;flex-direction:column;align-items:center;gap:6px;max-width:300px}
.badgepop .ic{width:84px;height:84px;border-radius:50%;display:grid;place-items:center;background:var(--accent);box-shadow:0 0 40px -6px var(--accent);animation:pop .6s cubic-bezier(.3,1.6,.5,1)}
.badgepop .ic svg{width:42px;height:42px;stroke:var(--on-accent)}
.badgepop p{margin:6px 0 0;font-family:var(--mono);color:var(--accent);letter-spacing:.08em;font-size:13px}
.badgepop b{font-size:20px}
.badgepop .secondary{margin-top:10px;min-height:42px;font-size:14px}
dialog h3{margin:16px 0 4px;font-size:15px}
.setrow{display:flex;justify-content:space-between;align-items:center;gap:10px;margin-top:10px;font-size:14px}
.setrow select{background:var(--panel-2);color:var(--text);border:1px solid var(--line);border-radius:10px;padding:8px 10px;font:inherit}
@media (prefers-reduced-motion:reduce){.st-a.on svg,.badgepop .ic{animation:none}}
@media (max-width:360px){.streak{grid-template-columns:1fr}}
.acct{font-size:14px;color:var(--muted);background:var(--panel-2);border:1px solid var(--line);border-radius:12px;padding:10px 12px;word-break:break-all}
.acct a{color:var(--accent)}

/* copyright line under every question and mark-scheme card */
.paper::after{content:"© Pearson Education Ltd · ICS Al Manhal use only";display:block;text-align:right;font:500 10px var(--sans);color:#6B7385;margin-top:-2px}
dialog .about{font-size:13px}

/* =====================================================================
   Themes (chosen in Settings, saved on the device). Each theme changes the
   colours AND the fonts, shapes, background art and unit layout.
   Default = Midnight Code (no data-theme attribute).
   ===================================================================== */

/* ---------- Paper Notebook: light, rounded, ruled paper, handwritten touches */
:root[data-theme="day"]{
  --bg:#F7F4EC; --panel:#FFFFFF; --panel-2:#F1EEE6; --line:#E2DCCD;
  --text:#24283A; --muted:#62667A; --off:#E6E1D4;
  --cs:#2F6FE0; --ict:#E07A12; --on-accent:#FFFFFF;
  --nav-bg:rgba(255,255,255,.96); --code-bg:#1E2433; --code-text:#E8ECF5;
  --sans:"Nunito",system-ui,sans-serif; --mono:"Nunito",system-ui,sans-serif; --hand:"Caveat","Comic Sans MS",cursive;
  --pattern:linear-gradient(90deg,transparent 46px,rgba(224,96,96,.35) 46px,rgba(224,96,96,.35) 48px,transparent 48px),repeating-linear-gradient(transparent 0 31px,#DCE5F0 31px 32px);
  --pattern-size:auto,auto;
}
:root[data-theme="day"] body::before{background:none}
:root[data-theme="day"] body{animation:none}
:root[data-theme="day"] h1{letter-spacing:0;font-weight:800;font-size:28px}
:root[data-theme="day"] .prompt,:root[data-theme="day"] .sec h2,:root[data-theme="day"] .hero .cap{font-family:var(--hand);font-size:20px;letter-spacing:0;text-transform:none;font-weight:700}
:root[data-theme="day"] .sec h2{color:var(--accent);font-size:24px}
:root[data-theme="day"] .cursor{display:none}
:root[data-theme="day"] .card,:root[data-theme="day"] .overall,:root[data-theme="day"] .hero,:root[data-theme="day"] .switch,
:root[data-theme="day"] .qrow,:root[data-theme="day"] .tile,:root[data-theme="day"] .streak>div,:root[data-theme="day"] .fixbtn{border-radius:22px;border-color:transparent;box-shadow:0 2px 0 var(--line),0 10px 24px -16px rgba(60,50,20,.35)}
:root[data-theme="day"] .chap{border-radius:20px;border:0;border-left:7px solid var(--accent);box-shadow:0 2px 0 var(--line),0 10px 24px -16px rgba(60,50,20,.35)}
:root[data-theme="day"] .chapters li:nth-child(odd) .chap{transform:rotate(-.4deg)}
:root[data-theme="day"] .chapters li:nth-child(even) .chap{transform:rotate(.4deg)}
:root[data-theme="day"] .chap:hover{transform:rotate(0) translateY(-2px)}
:root[data-theme="day"] .chap .num{border-radius:50%}
:root[data-theme="day"] .chap .bars span,:root[data-theme="day"] .meter span{border-radius:99px}
:root[data-theme="day"] .cta,:root[data-theme="day"] .primary,:root[data-theme="day"] .secondary,:root[data-theme="day"] .chip{border-radius:999px}
:root[data-theme="day"] .cta::after{display:none}
:root[data-theme="day"] nav{left:12px;right:12px;bottom:10px;border:1px solid var(--line);border-radius:24px;box-shadow:0 12px 30px -14px rgba(60,50,20,.45)}
:root[data-theme="day"] .diff.F{color:#137A4B;border-color:#9ED9BC}
:root[data-theme="day"] .diff.B{color:#8A6400;border-color:#E8D27A}
:root[data-theme="day"] .diff.S{color:#B24A12;border-color:#F2B48F}
:root[data-theme="day"] .diff.X{color:#B0204F;border-color:#F1A6BE;background:#FFF0F4}
:root[data-theme="day"] .danger{border-color:#E7A3A3;background:#FFF1F1;color:#A12626}
:root[data-theme="day"] .lvlup,:root[data-theme="day"] dialog::backdrop{background:rgba(36,40,58,.4)}
:root[data-theme="day"] .paper{box-shadow:0 2px 0 var(--line),0 10px 24px -16px rgba(60,50,20,.35);border-radius:18px}
:root[data-theme="day"] .goal-hex{filter:none}

/* ---------- Neon Arcade: pixel fonts, CRT scanlines, synthwave sun, level-select tiles */
:root[data-theme="neon"]{
  --bg:#FFE9F3; --panel:#FFFFFF; --panel-2:#FFF4D6; --line:#2B1458;
  --text:#2B1458; --muted:#6A4E93; --off:#F1DDF0;
  --cs:#7B2FF7; --ict:#FF3D8B; --on-accent:#FFFFFF;
  --nav-bg:rgba(255,255,255,.97); --code-bg:#2B1458; --code-text:#FFF4D6;
  --sans:"Chakra Petch",system-ui,sans-serif; --pixel:"Press Start 2P",monospace;
  --pattern:radial-gradient(circle,rgba(123,47,247,.18) 2px,transparent 2.5px); --pattern-size:22px 22px; --hard:5px 5px 0 #2B1458;
}
:root[data-theme="neon"] body{animation:none}
:root[data-theme="neon"] body::before{background:
  radial-gradient(circle at 50% 64%,transparent 0 0,transparent 0),
  linear-gradient(180deg,transparent 52%,rgba(255,79,216,.08) 70%,transparent 100%),
  radial-gradient(circle at 50% 108%,rgba(255,61,139,.35) 0 18%,rgba(255,196,0,.35) 19% 22%,transparent 46%)}
:root[data-theme="neon"] body::after{content:"";position:fixed;left:-50%;right:-50%;bottom:-6vh;height:46vh;z-index:0;pointer-events:none;
  background-image:linear-gradient(rgba(255,61,139,.35) 2px,transparent 2px),linear-gradient(90deg,rgba(123,47,247,.28) 2px,transparent 2px);
  background-size:60px 40px;transform:perspective(300px) rotateX(62deg);transform-origin:bottom;
  mask-image:linear-gradient(transparent,#000 60%);-webkit-mask-image:linear-gradient(transparent,#000 60%);animation:floor 2.4s linear infinite}
@keyframes floor{to{background-position:0 40px,0 0}}
:root[data-theme="neon"] h1{font-family:var(--pixel);font-size:16px;line-height:1.7;letter-spacing:0;text-transform:uppercase;text-shadow:3px 3px 0 #FFC400}
:root[data-theme="neon"] .word{font-family:var(--pixel);font-size:13px;letter-spacing:0}
:root[data-theme="neon"] .big,:root[data-theme="neon"] .bignum,:root[data-theme="neon"] .lvlup .n{font-family:var(--pixel);text-shadow:4px 4px 0 #FFC400}
:root[data-theme="neon"] .big{font-size:40px}
:root[data-theme="neon"] .sec h2,:root[data-theme="neon"] .chap .num,:root[data-theme="neon"] .lv,:root[data-theme="neon"] .badgepop p{font-family:var(--pixel);font-size:10px;letter-spacing:0}
:root[data-theme="neon"] .card,:root[data-theme="neon"] .overall,:root[data-theme="neon"] .hero,:root[data-theme="neon"] .switch,:root[data-theme="neon"] .chap,
:root[data-theme="neon"] .qrow,:root[data-theme="neon"] .tile,:root[data-theme="neon"] .streak>div,:root[data-theme="neon"] .fixbtn,:root[data-theme="neon"] .paper,
:root[data-theme="neon"] .cta,:root[data-theme="neon"] .primary,:root[data-theme="neon"] .secondary,:root[data-theme="neon"] .chip,:root[data-theme="neon"] .switch button,
:root[data-theme="neon"] .mk,:root[data-theme="neon"] .icon-btn,:root[data-theme="neon"] .mark,:root[data-theme="neon"] dialog,:root[data-theme="neon"] .lvlup .box{border-radius:0}
:root[data-theme="neon"] .card,:root[data-theme="neon"] .overall,:root[data-theme="neon"] .hero,:root[data-theme="neon"] .chap,:root[data-theme="neon"] .qrow,
:root[data-theme="neon"] .tile,:root[data-theme="neon"] .streak>div,:root[data-theme="neon"] .fixbtn,:root[data-theme="neon"] .switch,:root[data-theme="neon"] .icon-btn,:root[data-theme="neon"] .mark{border:3px solid var(--line);box-shadow:var(--hard)}
:root[data-theme="neon"] .chip,:root[data-theme="neon"] .mk,:root[data-theme="neon"] .secondary,:root[data-theme="neon"] .lv{border:2px solid var(--line)}
:root[data-theme="neon"] .hero{background:linear-gradient(180deg,#2B1458,#7B2FF7 140%)}
:root[data-theme="neon"] .hero .cap,:root[data-theme="neon"] .hero .ulabel,:root[data-theme="neon"] .hero .lvl-num{color:#FFE9F3;fill:#FFE9F3}
:root[data-theme="neon"] .hero .icon{stroke:#FFFFFF}:root[data-theme="neon"] .hero .icon text{fill:#FFFFFF}
:root[data-theme="neon"] .hero .node-bg{fill:#3A1C74;stroke:#FFC400}
:root[data-theme="neon"] .hero .map-path{stroke:#5B3A9C}
:root[data-theme="neon"] .diff.F{color:#0E7A4A;border-color:#0E7A4A}
:root[data-theme="neon"] .diff.B{color:#8A6400;border-color:#8A6400;background:#FFF4D6}
:root[data-theme="neon"] .diff.S{color:#B24A12;border-color:#B24A12}
:root[data-theme="neon"] .diff.X{color:#C2185B;border-color:#C2185B;background:#FFE9F3}
:root[data-theme="neon"] .danger{border:2px solid #C2185B;background:#FFE9F3;color:#9C1048;border-radius:0}
:root[data-theme="neon"] .lvlup,:root[data-theme="neon"] dialog::backdrop{background:rgba(43,20,88,.5)}
:root[data-theme="neon"] .cta,:root[data-theme="neon"] .primary{border:3px solid var(--line);box-shadow:0 5px 0 #2B1458;text-transform:uppercase;letter-spacing:1px}
:root[data-theme="neon"] .cta:active,:root[data-theme="neon"] .primary:active{transform:translateY(4px);box-shadow:0 1px 0 #2B1458}
:root[data-theme="neon"] .chapters{display:grid;grid-template-columns:1fr 1fr;gap:12px}
:root[data-theme="neon"] .chap{grid-template-columns:1fr;grid-template-rows:auto;justify-items:center;text-align:center;row-gap:8px;padding:14px 10px;height:100%}
:root[data-theme="neon"] .chap .num{grid-row:auto;width:auto;height:auto;padding:6px 8px;background:#FFC400;color:#2B1458;border:2px solid #2B1458}
:root[data-theme="neon"] .chap .num::before{content:"LVL";margin-right:6px}
:root[data-theme="neon"] .chap .name{font-weight:600;font-size:14px}
:root[data-theme="neon"] .chap .bars{grid-column:auto;width:100%}
:root[data-theme="neon"] .chap .bars span,:root[data-theme="neon"] .meter span{border-radius:0;height:8px}
:root[data-theme="neon"] .chap:hover{transform:translate(-2px,-2px);box-shadow:7px 7px 0 var(--accent)}
:root[data-theme="neon"] .chapters li:nth-child(4n+1) .chap{background:#FFFFFF}:root[data-theme="neon"] .chapters li:nth-child(4n+2) .chap{background:#FFF4D6}
:root[data-theme="neon"] .chapters li:nth-child(4n+3) .chap{background:#E8F7FF}:root[data-theme="neon"] .chapters li:nth-child(4n) .chap{background:#F3E8FF}
:root[data-theme="neon"] nav{border-top:3px solid var(--line)}
:root[data-theme="neon"] .paper{box-shadow:var(--hard)}

/* ---------- Circuit Board: terminal fonts, notched panels, PCB traces, LED meters */
:root[data-theme="circuit"]{
  --bg:#14774A; --panel:#0F6640; --panel-2:#0C5735; --line:#3E9B6C;
  --text:#F2FFF6; --muted:#BFE8D0; --off:#0A4A2D;
  --cs:#FFD24A; --ict:#FFFFFF; --on-accent:#0B3F26;
  --nav-bg:rgba(12,87,53,.97); --code-bg:#0A3D25; --code-text:#E9FFF1;
  --mono:"Share Tech Mono",ui-monospace,monospace; --term:"VT323",monospace;
  --pattern:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cg fill='none' stroke='%23E8B34A' stroke-opacity='.45' stroke-width='2'%3E%3Cpath d='M0 40h50l20 20h50l20-20h20M40 0v30l20 20v40M100 160v-40l-20-20H30L10 80V60M160 120h-40l-20-20'/%3E%3C/g%3E%3Cg fill='%23F5D27A' fill-opacity='.6'%3E%3Ccircle cx='40' cy='30' r='4'/%3E%3Ccircle cx='60' cy='90' r='4'/%3E%3Ccircle cx='120' cy='60' r='4'/%3E%3Ccircle cx='100' cy='120' r='4'/%3E%3Ccircle cx='10' cy='60' r='4'/%3E%3C/g%3E%3C/svg%3E");
  --pattern-size:160px 160px; --notch:polygon(14px 0,100% 0,100% calc(100% - 14px),calc(100% - 14px) 100%,0 100%,0 14px);
}
:root[data-theme="circuit"] body{animation:none}
:root[data-theme="circuit"] h1{font-family:var(--term);font-size:40px;line-height:1;letter-spacing:0;font-weight:400;text-shadow:2px 2px 0 #0A4A2D}
:root[data-theme="circuit"] body::before{background:radial-gradient(ellipse at top,transparent 0,rgba(10,74,45,.55) 80%)}
:root[data-theme="circuit"] .card,:root[data-theme="circuit"] .overall,:root[data-theme="circuit"] .hero,:root[data-theme="circuit"] .streak>div,:root[data-theme="circuit"] .fixbtn,:root[data-theme="circuit"] .tile,:root[data-theme="circuit"] .qrow{background:linear-gradient(135deg,#0F6640,#0C5735);outline:1px solid rgba(232,179,74,.35);outline-offset:-5px}
:root[data-theme="circuit"] .chap .lv{background:#0B3F26}
:root[data-theme="circuit"] .diff.F{color:#C8FFDF;border-color:#7FD8A6}
:root[data-theme="circuit"] .diff.B{color:#FFE27A;border-color:#E8B34A}
:root[data-theme="circuit"] .diff.S{color:#FFC59E;border-color:#F09A64}
:root[data-theme="circuit"] .diff.X{color:#FFC4D6;border-color:#F08DAE;background:#0B3F26}
:root[data-theme="circuit"] .word{font-family:var(--term);font-size:28px;font-weight:400;letter-spacing:0}
:root[data-theme="circuit"] .big,:root[data-theme="circuit"] .bignum,:root[data-theme="circuit"] .lvlup .n{font-family:var(--term);font-weight:400;text-shadow:3px 3px 0 #0A4A2D}
:root[data-theme="circuit"] .big{font-size:78px}
:root[data-theme="circuit"] .card,:root[data-theme="circuit"] .overall,:root[data-theme="circuit"] .hero,:root[data-theme="circuit"] .switch,
:root[data-theme="circuit"] .tile,:root[data-theme="circuit"] .streak>div,:root[data-theme="circuit"] .fixbtn,:root[data-theme="circuit"] .qrow,
:root[data-theme="circuit"] .cta,:root[data-theme="circuit"] .primary,:root[data-theme="circuit"] .secondary{border-radius:0;clip-path:var(--notch)}
:root[data-theme="circuit"] .switch button,:root[data-theme="circuit"] .chip,:root[data-theme="circuit"] .mk,:root[data-theme="circuit"] .icon-btn,:root[data-theme="circuit"] .mark,:root[data-theme="circuit"] .paper,:root[data-theme="circuit"] dialog{border-radius:2px}
:root[data-theme="circuit"] .sec h2::before,:root[data-theme="circuit"] .overall .label::before{content:"> ";color:var(--accent)}
:root[data-theme="circuit"] .chapters{gap:0;border-top:1px dashed var(--line)}
:root[data-theme="circuit"] .chap{background:transparent;border:0;border-bottom:1px dashed var(--line);border-radius:0;padding:12px 4px}
:root[data-theme="circuit"] .chap:hover{background:rgba(255,210,74,.12);transform:none}
:root[data-theme="circuit"] .chap .num{background:none;width:auto;color:var(--accent)}
:root[data-theme="circuit"] .chap .num::before{content:"["}
:root[data-theme="circuit"] .chap .num::after{content:"]"}
:root[data-theme="circuit"] .chap .name{text-transform:uppercase;letter-spacing:.5px;font-size:14px}
:root[data-theme="circuit"] .chap .lv{border-radius:2px}
:root[data-theme="circuit"] .chap .bars span,:root[data-theme="circuit"] .meter span{border-radius:50%;height:8px;max-width:8px;margin:0 auto}
:root[data-theme="circuit"] .chap .bars span.on,:root[data-theme="circuit"] .meter span.on{box-shadow:0 0 6px var(--accent)}
:root[data-theme="circuit"] .chap .bars,:root[data-theme="circuit"] .meter{gap:6px}
:root[data-theme="circuit"] .cta{text-transform:uppercase;letter-spacing:2px;font-family:var(--mono)}
:root[data-theme="circuit"] .cta::before{content:"$ ";font-family:var(--mono)}
:root[data-theme="circuit"] nav{border-top:1px solid var(--accent);box-shadow:0 -6px 20px -12px var(--accent)}
:root[data-theme="circuit"] nav a.navb{font-family:var(--mono);text-transform:uppercase;letter-spacing:1px}

@media (prefers-reduced-motion:reduce){:root[data-theme="neon"] body::after{animation:none}}

/* ---------- Gold Classic: matches the A+ Maths Hub look (cream paper, navy serif titles, gold accents) */
:root[data-theme="classic"]{
  --bg:#F6F5F1; --panel:#FFFFFF; --panel-2:#F1EFE8; --line:#E3DFD3;
  --text:#1B2A4A; --muted:#6B7080; --off:#ECE8DC;
  --cs:#C9A227; --ict:#1D6F93; --on-accent:#1B2A4A;
  --nav-bg:rgba(255,255,255,.97); --code-bg:#1B2A4A; --code-text:#F3EBD0;
  --sans:system-ui,-apple-system,"Segoe UI",sans-serif; --serif:Georgia,"Times New Roman",serif;
  --pattern:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='240' height='240'%3E%3Cg fill='%23D4AF37' fill-opacity='.16' font-family='Georgia,serif'%3E%3Ctext x='18' y='48' font-size='34'%3E%7B %7D%3C/text%3E%3Ctext x='150' y='70' font-size='28'%3E01%3C/text%3E%3Ctext x='70' y='140' font-size='38'%3E%26lt;/%26gt;%3C/text%3E%3Ctext x='176' y='170' font-size='30'%3E%E2%88%91%3C/text%3E%3Ctext x='24' y='214' font-size='26'%3Eif%3C/text%3E%3Ctext x='132' y='228' font-size='24'%3E%E2%89%A0%3C/text%3E%3C/g%3E%3C/svg%3E");
  --pattern-size:240px 240px;
}
:root[data-theme="classic"][data-subject="ict"]{--on-accent:#FFFFFF}
:root[data-theme="classic"] body{animation:none}
:root[data-theme="classic"] body::before{background:radial-gradient(ellipse at top,transparent 0,rgba(246,245,241,.6) 75%)}
:root[data-theme="classic"] h1,:root[data-theme="classic"] .word,:root[data-theme="classic"] .big,:root[data-theme="classic"] .bignum,:root[data-theme="classic"] .lvlup .n,
:root[data-theme="classic"] .chap .name,:root[data-theme="classic"] .overall .title,:root[data-theme="classic"] .card h2,:root[data-theme="classic"] .vh{font-family:var(--serif);letter-spacing:0}
:root[data-theme="classic"] h1{font-weight:700;font-size:28px;color:var(--text)}
:root[data-theme="classic"] .word{font-weight:700;font-size:21px}
:root[data-theme="classic"] .big{font-weight:700;color:var(--text)}
:root[data-theme="classic"] .prompt{font-family:var(--sans);font-size:12px;font-weight:800;letter-spacing:2.5px;text-transform:uppercase;color:#8A6D12}
:root[data-theme="classic"] .prompt .acc,:root[data-theme="classic"] .cursor{display:none}
:root[data-theme="classic"] .sec h2{font-family:var(--sans);font-weight:800;letter-spacing:2.5px;color:#8A6D12}
:root[data-theme="classic"] .mark{background:linear-gradient(145deg,#E2C35A,#B8901C);border:0;box-shadow:0 6px 14px -6px rgba(138,109,18,.6)}
:root[data-theme="classic"] .mark i{background:rgba(255,255,255,.7)}:root[data-theme="classic"] .mark i:last-child{background:#FFFFFF}
:root[data-theme="classic"] .card,:root[data-theme="classic"] .overall,:root[data-theme="classic"] .hero,:root[data-theme="classic"] .switch,:root[data-theme="classic"] .qrow,
:root[data-theme="classic"] .tile,:root[data-theme="classic"] .streak>div,:root[data-theme="classic"] .fixbtn{border-radius:18px;box-shadow:0 1px 2px rgba(20,24,40,.06)}
:root[data-theme="classic"] .streak>div,:root[data-theme="classic"] .tile{background:var(--panel-2)}
:root[data-theme="classic"] .chap{border-radius:18px;border:2px solid var(--accent);border-left-width:9px;padding:14px 16px;box-shadow:0 1px 2px rgba(20,24,40,.06)}
:root[data-theme="classic"] .chapters li:nth-child(3n+2) .chap{border-color:#4FA8C9}
:root[data-theme="classic"] .chapters li:nth-child(3n+2) .chap .num{background:#4FA8C9}
:root[data-theme="classic"] .chapters li:nth-child(3n+2) .chap .name{color:#1D6F93}
:root[data-theme="classic"] .chapters li:nth-child(3n) .chap{border-color:#6FBF7F}
:root[data-theme="classic"] .chapters li:nth-child(3n) .chap .num{background:#6FBF7F}
:root[data-theme="classic"] .chapters li:nth-child(3n) .chap .name{color:#2F7D45}
:root[data-theme="classic"] .chap .num{width:44px;height:44px;border-radius:12px;background:var(--accent);color:#FFFFFF;font-size:16px}
:root[data-theme="classic"] .chap{grid-template-columns:44px 1fr auto}
:root[data-theme="classic"] .chap .name{font-weight:700;font-size:17px;color:#8A6D12}
:root[data-theme="classic"][data-subject="ict"] .chapters li:nth-child(3n+1) .chap .name{color:#1D6F93}
:root[data-theme="classic"] .chap .bars span,:root[data-theme="classic"] .meter span{border-radius:99px}
:root[data-theme="classic"] .cta,:root[data-theme="classic"] .primary{border-radius:14px;box-shadow:0 6px 14px -8px rgba(138,109,18,.55)}
:root[data-theme="classic"] .secondary,:root[data-theme="classic"] .chip{border-radius:14px}
:root[data-theme="classic"] .cta::after{display:none}
:root[data-theme="classic"] .goal-hex{filter:none}
:root[data-theme="classic"] .hero::after{display:none}
:root[data-theme="classic"] .diff.F{color:#2F7D45;border-color:#A9D8B4}
:root[data-theme="classic"] .diff.B{color:#7E620E;border-color:#E6CF86;background:#FFF7DC}
:root[data-theme="classic"] .diff.S{color:#A4501C;border-color:#EBB896}
:root[data-theme="classic"] .diff.X{color:#A8234F;border-color:#EFAFC3;background:#FFF1F5}
:root[data-theme="classic"] .danger{border-color:#E7A3A3;background:#FFF1F1;color:#A12626}
:root[data-theme="classic"] .lvlup,:root[data-theme="classic"] dialog::backdrop{background:rgba(27,42,74,.45)}
:root[data-theme="classic"] .paper{border:1px solid var(--line);box-shadow:0 1px 2px rgba(20,24,40,.06)}

/* theme picker */
.themes{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-top:10px}
.themes button{display:flex;flex-direction:column;gap:6px;align-items:stretch;text-align:left;padding:8px;border-radius:14px;border:2px solid var(--line);background:var(--panel-2);color:var(--text);font-size:13px;font-weight:600}
.themes button[aria-pressed="true"]{border-color:var(--accent);box-shadow:0 0 0 3px color-mix(in srgb,var(--accent) 25%,transparent)}
.themes .sw{height:54px;border-radius:9px;position:relative;overflow:hidden;border:1px solid rgba(127,127,127,.25)}
.themes .sw i{position:absolute;left:8px;right:8px;height:8px;border-radius:4px}
.themes .sw i:nth-child(1){top:9px;right:40%}
.themes .sw i:nth-child(2){top:23px;opacity:.55}
.themes .sw i:nth-child(3){bottom:9px;width:26px;right:auto;height:12px;border-radius:6px}
.themes .sw b{position:absolute;right:8px;top:6px;font-size:18px;line-height:1;font-weight:700}
.themes small{font-weight:400;color:var(--muted);font-size:11px;line-height:1.3}
.top-r .icon-btn svg{width:20px;height:20px}
:root[data-theme="neon"] .chap .num,:root[data-theme="circuit"] .chap .num{white-space:nowrap}
:root[data-theme="circuit"] .chap{grid-template-columns:auto 1fr auto}
:root[data-theme="circuit"] .chap .num{font-size:17px}
:root[data-theme="neon"] .chap .num,:root[data-theme="circuit"] .chap .num{display:flex;align-items:center;justify-content:center}
:root[data-theme="circuit"] .chap .lv.check{background:var(--accent);color:var(--on-accent)}
:root[data-theme="neon"] .big small{text-shadow:none;font-family:var(--sans);font-weight:600}

/* ---- how-to video and community counters (home page) */
.tour{margin:6px 0 0;background:var(--panel);border:1px solid var(--line);border-radius:18px;overflow:hidden}
.tour video{display:block;width:100%;aspect-ratio:9/16;max-height:70vh;background:#0A0F1A;object-fit:contain}
.tour figcaption{padding:12px 14px;display:flex;flex-direction:column;gap:3px}
.tour figcaption b{font-size:15px}.tour figcaption span{font-size:13px;color:var(--muted)}
.community{display:grid;grid-template-columns:repeat(3,1fr);gap:8px}
.community[hidden]{display:none}
.community div{background:var(--panel-2);border:1px solid var(--line);border-radius:14px;padding:12px 6px;text-align:center}
.community b{display:block;font-family:var(--mono);font-size:24px;color:var(--text)}
.community span{font-size:10px;letter-spacing:1px;text-transform:uppercase;color:var(--muted)}
:root[data-theme="classic"] .community b{font-family:var(--serif)}
:root[data-theme="neon"] .community b{font-family:var(--pixel);font-size:15px;line-height:1.8}
:root[data-theme="circuit"] .community b{font-family:var(--term);font-size:32px}
:root[data-theme="neon"] .tour,:root[data-theme="neon"] .community div{border-radius:0;border:3px solid var(--line);box-shadow:var(--hard)}
:root[data-theme="circuit"] .tour,:root[data-theme="circuit"] .community div{border-radius:0;clip-path:var(--notch)}