/* بيمو · BIMO 笔墨 — themes. Default: night blue (like writing on a lit tablet). */
:root{--ui:"Tajawal","IBM Plex Sans Arabic",Tahoma,Arial,sans-serif;--zh:"Noto Sans SC","PingFang SC","Microsoft YaHei",sans-serif;--brush:"Ma Shan Zheng","Noto Sans SC","KaiTi","STKaiti",serif;--radius:22px}
@font-face{font-family:BimoArabic;src:url('assets/fonts/NotoNaskhArabic-Regular.ttf') format('truetype');font-weight:400;font-display:swap}
@font-face{font-family:BimoArabic;src:url('assets/fonts/NotoNaskhArabic-Bold.ttf') format('truetype');font-weight:700 900;font-display:swap}
@font-face{font-family:BimoHeading;src:url('assets/fonts/NotoSansArabic-Bold.ttf') format('truetype');font-weight:700 900;font-display:swap}
:root{--ui:BimoArabic,Tahoma,Arial,sans-serif;--heading:BimoHeading,BimoArabic,Tahoma,Arial,sans-serif}
body[data-theme=night]{--bg:#18238C;--bg2:#121B72;--card:#2131A6;--card-line:#3E52C9;--cell:#1C2A95;--cell-line:#4B60D6;--guide:#5B70E0;--ink:#FFFFFF;--text:#F2F5FF;--muted:#B8C4F5;--accent:#F6A43A;--accent-ink:#2A1600;--tpl:rgba(190,205,255,.34);--tpl-anim:#FFD27A;--danger:#E5484D;--ok:#35D08A;--pill:#2A3BB5;--pill-line:#6477E6;color-scheme:dark}
body[data-theme=day]{--bg:#EEF3FF;--bg2:#E1E9FC;--card:#FFFFFF;--card-line:#D5E0F7;--cell:#F7F9FF;--cell-line:#C9D6F2;--guide:#D3DDF4;--ink:#162D5C;--text:#172D55;--muted:#61718C;--accent:#1769EF;--accent-ink:#fff;--tpl:rgba(23,105,239,.18);--tpl-anim:#1769EF;--danger:#D63B4F;--ok:#0E8F6E;--pill:#EDF3FF;--pill-line:#C9D8F6;color-scheme:light}
body[data-theme=paper]{--bg:#EDE3CF;--bg2:#E4D7BC;--card:#FBF6EA;--card-line:#E3D3B0;--cell:#FFFDF6;--cell-line:#D9B97A;--guide:#E8D3A8;--ink:#1D1A17;--text:#2B241B;--muted:#7A6A55;--accent:#B8452F;--accent-ink:#fff;--tpl:rgba(184,69,47,.16);--tpl-anim:#B8452F;--danger:#B8452F;--ok:#3F7D4E;--pill:#F4ECDB;--pill-line:#DCC9A3;color-scheme:light}
*{box-sizing:border-box}html{background:var(--bg)}body{margin:0;background:var(--bg);color:var(--text);font-family:var(--ui);line-height:1.7;min-height:100vh}
button,input{font:inherit;color:inherit}button{cursor:pointer;border:0;background:none;-webkit-tap-highlight-color:transparent}
button:focus-visible,input:focus-visible,a:focus-visible{outline:3px solid var(--accent);outline-offset:2px}h1,h2,p{margin:0}[hidden]{display:none!important}
/* home */
.home{max-width:1080px;margin:0 auto;padding:16px 16px 30px}
.home-top{display:flex;justify-content:space-between;align-items:center}.brand{background:#00072F;border-radius:12px;padding:4px 12px;line-height:0}.brand img{width:140px}
.icon-btn{width:44px;height:44px;border-radius:50%;background:var(--pill);border:1px solid var(--pill-line);font-size:20px}
.home-hero{display:flex;align-items:center;justify-content:space-between;gap:20px;padding:26px 2px 20px}
.eyebrow{color:var(--accent);font-weight:700;font-size:13px}.home-hero h1{font-size:clamp(28px,4.6vw,46px);line-height:1.3;font-weight:800;margin:6px 0;text-wrap:balance}.home-hero h1 span{color:var(--accent)}
.lead{color:var(--muted);font-size:16px;max-width:600px}.cta{margin-top:16px;background:var(--accent);color:var(--accent-ink);font-weight:800;border-radius:14px;padding:12px 22px;min-height:50px;font-size:16px}
.faces{display:flex;flex-shrink:0}.faces img{width:96px;height:96px;border-radius:50%;border:4px solid var(--card);margin-inline-start:-18px;object-fit:cover;background:var(--card)}.faces img:nth-child(2){width:120px;height:120px;z-index:2}
.units{display:flex;gap:8px;flex-wrap:wrap;margin:6px 0 14px}.units button{background:var(--pill);border:1px solid var(--pill-line);border-radius:12px;padding:8px 16px;font-weight:700;min-height:44px}.units button[aria-selected=true]{background:var(--accent);color:var(--accent-ink);border-color:var(--accent)}
.lessons{display:grid;grid-template-columns:repeat(auto-fill,minmax(170px,1fr));gap:12px}
.ltile{position:relative;background:var(--card);border:1px solid var(--card-line);border-radius:18px;padding:14px;text-align:right;min-height:120px;display:flex;flex-direction:column;gap:4px}
.ltile small{color:var(--muted);font-size:12px}.ltile .zh{font:700 24px var(--zh);letter-spacing:2px;overflow:hidden;white-space:nowrap;text-overflow:ellipsis}.ltile .meta{font-size:12px;color:var(--muted)}
.ltile.done::after{content:"✓";position:absolute;left:12px;top:10px;background:var(--ok);color:#fff;border-radius:50%;width:26px;height:26px;display:grid;place-items:center;font-weight:800}
.foot{margin-top:24px;text-align:center;font-size:12px;color:var(--muted)}
/* lesson bar */
.bar{position:sticky;top:0;z-index:5;display:flex;align-items:center;gap:10px;flex-wrap:wrap;padding:calc(10px + env(safe-area-inset-top,0px)) 16px 10px;background:color-mix(in srgb,var(--bg2) 92%,transparent);backdrop-filter:blur(8px);border-bottom:1px solid var(--card-line)}
.bar-title{display:flex;flex-direction:column;line-height:1.3;min-width:0}.bar-title small{font-size:11px;color:var(--muted)}.bar-title b{font:700 15px var(--zh);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:40vw}
.bar-actions{display:flex;gap:6px;flex-wrap:wrap;margin-inline-start:auto}
.pill{background:var(--pill);border:1px solid var(--pill-line);border-radius:10px;padding:6px 12px;font-size:13px;font-weight:700;min-height:38px;white-space:nowrap}
.pill.ghost{background:transparent}.pill.toggle[aria-pressed=true]{background:color-mix(in srgb,var(--accent) 22%,var(--pill));border-color:var(--accent)}
.pill.done{background:var(--accent);color:var(--accent-ink);border-color:var(--accent)}.pill.icon{font-size:17px;padding:4px 10px}
.pill.red{background:var(--danger);border-color:var(--danger);color:#fff}.pill.outline{background:transparent}.pill.gold{background:var(--accent);border-color:var(--accent);color:var(--accent-ink)}
/* feed */
.feed{max-width:900px;margin:0 auto;padding:18px 16px;display:grid;gap:22px}
.wcard{background:var(--card);border:1px solid var(--card-line);border-radius:var(--radius);padding:16px;scroll-margin-top:80px}
.whead{display:grid;grid-template-columns:auto 1fr auto;align-items:center;gap:10px}
.side-btns{display:flex;gap:8px}.round{width:44px;height:44px;border-radius:50%;display:grid;place-items:center;font-size:18px}.round.gold{background:var(--accent);color:var(--accent-ink)}.round.line{border:2px solid var(--pill-line)}
.wtext{text-align:center}.wtext .hz{font:700 clamp(30px,5vw,40px)/1.2 var(--zh);letter-spacing:3px}.wtext .py{color:var(--accent);font:700 18px Arial,sans-serif;direction:ltr}.wtext .ar{color:var(--muted);font-size:15px}
.tools{display:flex;gap:6px;flex-wrap:wrap;justify-content:center;margin:12px 0}
.type-row{display:flex;gap:8px;align-items:center;justify-content:center;margin:-4px 0 12px;flex-wrap:wrap}.type-row input{direction:ltr;min-height:42px;border-radius:10px;border:1px solid var(--pill-line);background:var(--cell);padding:6px 12px;width:min(260px,70vw);font-size:16px}.type-row span{font-weight:700}
.gridwrap{position:relative;border-radius:16px;overflow:hidden;border:2px solid var(--cell-line);background:var(--cell)}
.cells{display:grid}
.cell{position:relative;aspect-ratio:1;border-inline-start:1px solid var(--cell-line);border-top:1px solid var(--cell-line);
  background:linear-gradient(var(--guide),var(--guide)) center/1px 100% no-repeat,linear-gradient(var(--guide),var(--guide)) center/100% 1px no-repeat}
.cell.pic{background:var(--cell);display:grid;place-items:center}.cell.pic img{width:74%;height:74%;object-fit:contain;border-radius:50%;background:color-mix(in srgb,var(--card) 60%,#fff 40%)}
.cell .hw{position:absolute;inset:0;pointer-events:none}.cell .hw svg{width:100%;height:100%;display:block}
.cell .tag{position:absolute;top:6px;inset-inline-end:6px;font-size:11px;color:var(--muted);pointer-events:none}
.cell .qbtn{position:absolute;bottom:6px;inset-inline-end:6px;width:30px;height:30px;border-radius:50%;background:var(--pill);border:1px solid var(--pill-line);font-size:13px;z-index:3;pointer-events:auto}
.cell .badge{position:absolute;top:6px;inset-inline-start:6px;z-index:3;font-size:13px;font-weight:800;padding:1px 8px;border-radius:12px;background:var(--pill);border:1px solid var(--pill-line);pointer-events:none}
.cell .badge.ok{background:var(--ok);border-color:var(--ok);color:#fff}.cell .badge.bad{background:var(--danger);border-color:var(--danger);color:#fff}
canvas.ink{position:absolute;inset:0;width:100%;height:100%;z-index:2;touch-action:none;cursor:crosshair}
.feedback{margin-top:10px;font-size:14px;color:var(--muted);text-align:center;min-height:22px}.feedback b{color:var(--text)}
.lesson-end{text-align:center;padding:10px 16px 40px}
/* dialogs */
dialog{border:1px solid var(--card-line);background:var(--card);color:var(--text);border-radius:22px;padding:24px;width:min(560px,calc(100vw - 24px));max-height:88vh;overflow:auto;direction:rtl;font-family:var(--ui)}dialog::backdrop{background:#050A2ECC;backdrop-filter:blur(3px)}
dialog h2{font-size:20px;margin-bottom:8px}.close{position:absolute;left:12px;top:12px;width:36px;height:36px;border-radius:50%;background:var(--pill);font-size:22px}
.lbl{font-weight:700;margin-top:14px}.hint{font-size:13px;color:var(--muted)}.swatches{display:flex;gap:8px;flex-wrap:wrap;margin-top:6px}.swatches button{min-width:44px;height:44px;border-radius:12px;border:2px solid var(--pill-line);padding:0 12px;font-weight:700}.swatches button[aria-pressed=true]{border-color:var(--accent);box-shadow:0 0 0 3px color-mix(in srgb,var(--accent) 35%,transparent)}
#brushSize{width:100%;accent-color:var(--accent)}
.study-top{display:flex;gap:16px;align-items:center;flex-wrap:wrap}.study-writer{width:220px;height:220px;border-radius:16px;background:var(--cell);border:2px solid var(--cell-line);flex-shrink:0}
.study-char{font:700 40px var(--zh)}.study-py{color:var(--accent);font:700 18px Arial;direction:ltr;margin-bottom:8px}.study-side{display:flex;flex-direction:column;align-items:flex-start}
.study-info{margin-top:14px;display:grid;gap:8px}.fact{background:var(--cell);border:1px solid var(--cell-line);border-radius:12px;padding:8px 12px;font-size:14px}.fact>span{display:block;font-size:12px;color:var(--muted)}.fact .zh{font:700 20px var(--zh)}
.comp{display:inline-flex;gap:4px;align-items:center;border:1px solid var(--cell-line);border-radius:10px;padding:0 8px;margin:4px 0 0 6px}
.toast{position:fixed;bottom:calc(20px + env(safe-area-inset-bottom,0px));left:50%;transform:translateX(-50%);background:var(--accent);color:var(--accent-ink);font-weight:800;padding:10px 20px;border-radius:14px;z-index:20;box-shadow:0 10px 30px #0006}
@media(max-width:640px){.bar{flex-wrap:nowrap;gap:6px;padding-inline:10px}.bar .t{display:none}.bar .pill{min-width:40px;font-size:15px;padding:4px 8px}.bar-actions{flex-wrap:nowrap}.bar-title b{max-width:28vw}.faces{display:none}.bar-title b{max-width:34vw}.pill{font-size:12px;padding:5px 9px}.feed{padding:12px 10px}.wcard{padding:12px}.round{width:40px;height:40px}}
@media(prefers-reduced-motion:reduce){*{transition:none!important;animation:none!important}}

/* ===== BIMO world ===== */
.page{min-height:100vh}
#map{max-width:1100px;margin:0 auto;padding:12px 16px 34px}
.topbar{display:flex;justify-content:space-between;align-items:center;padding-top:env(safe-area-inset-top,0px)}
.mark{display:flex;align-items:center;gap:10px}
.seal{font:400 26px/1 var(--brush);background:#C8312B;color:#FFF3E6;border-radius:10px;padding:8px 8px 6px;letter-spacing:1px;box-shadow:inset 0 0 0 2px #FFF3E655}
.mark-t{display:flex;flex-direction:column;line-height:1.15}.mark-t b{font-size:22px;font-weight:800}.mark-t small{font-size:11px;color:var(--muted);letter-spacing:.5px}
.hero{position:relative;margin-top:14px;border-radius:26px;overflow:hidden;background:var(--bg2);border:1px solid var(--card-line);display:grid;grid-template-columns:1.1fr 1fr;align-items:center}
.hero-img{width:100%;height:100%;object-fit:cover;min-height:260px;display:block}
.hero-text{padding:24px 26px}
.eyebrow{color:var(--accent);font-weight:700;font-size:13px;letter-spacing:.3px}
.hero h1{font-size:clamp(28px,4.2vw,44px);line-height:1.3;font-weight:800;margin:6px 0 8px;text-wrap:balance}.hero h1 span{color:var(--accent);display:block}
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;margin:16px 0}
.stat{background:var(--card);border:1px solid var(--card-line);border-radius:18px;padding:10px 12px;display:grid;grid-template-columns:auto 1fr;grid-template-rows:auto auto;column-gap:10px;align-items:center}
.stat .si{grid-row:span 2;width:40px;height:40px;border-radius:12px;display:grid;place-items:center;background:var(--pill);font:700 18px var(--zh)}
.stat b{font-size:22px;font-variant-numeric:tabular-nums;line-height:1.1}.stat small{color:var(--muted);font-size:12px}
.daily{display:grid;grid-template-columns:1fr auto auto;gap:18px;align-items:center;background:linear-gradient(135deg,color-mix(in srgb,var(--accent) 22%,var(--card)),var(--card));border:1px solid color-mix(in srgb,var(--accent) 45%,var(--card-line));border-radius:22px;padding:16px 20px}
.daily h3{margin:2px 0;font-size:19px}.muted{color:var(--muted);font-size:14px}
.daily-chars{display:flex;gap:6px}.daily-chars span{width:52px;height:52px;border-radius:12px;display:grid;place-items:center;font:700 28px var(--zh);background:var(--cell);border:1px solid var(--cell-line)}
.daily-chars span.got{background:var(--ok);border-color:var(--ok);color:#fff}
.daily .cta{margin:0}
.sec{font-size:20px;margin:24px 2px 12px}
.worlds{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}
.wtile{display:grid;grid-template-columns:150px 1fr;text-align:right;background:var(--card);border:1px solid var(--card-line);border-radius:22px;overflow:hidden;min-height:170px;transition:transform .15s,border-color .15s}
.wtile:hover{transform:translateY(-2px);border-color:var(--accent)}
.wimg{display:block;background:var(--bg2)}.wimg img{width:100%;height:100%;object-fit:cover;display:block}
.wbody{display:flex;flex-direction:column;gap:3px;padding:14px 16px}
.wbody small{font:700 14px var(--zh);color:var(--hue)}.wbody b{font-size:19px}
.wblurb{font-size:13.5px;color:var(--muted);line-height:1.6}.wmeta{font-size:12px;font-weight:700;margin-top:auto}
.meter{display:block;height:6px;border-radius:6px;background:var(--pill);overflow:hidden;margin-top:6px}.meter i{display:block;height:100%;background:var(--hue);border-radius:6px}
.wtile.gold{--hue:#F6A43A}.wtile.cyan{--hue:#4FD1E8}.wtile.pink{--hue:#FF8FB8}.wtile.green{--hue:#46D39A}
body[data-theme=day] .wtile.gold,body[data-theme=paper] .wtile.gold{--hue:#C77A0F}body[data-theme=day] .wtile.cyan,body[data-theme=paper] .wtile.cyan{--hue:#0B8BA3}body[data-theme=day] .wtile.pink,body[data-theme=paper] .wtile.pink{--hue:#C23C72}body[data-theme=day] .wtile.green,body[data-theme=paper] .wtile.green{--hue:#138A5B}
.wrap{max-width:1080px;margin:0 auto;padding:14px 16px 30px}
.world-blurb{color:var(--muted);margin:4px 2px 12px}
.units{overflow-x:auto;flex-wrap:nowrap;padding-bottom:4px}.units button{white-space:nowrap;flex-shrink:0}
.cta.alt{background:transparent;color:var(--text);border:2px solid var(--accent)}
.lesson-end{display:flex;gap:10px;justify-content:center;flex-wrap:wrap}
/* lesson intro + card extras */
.intro{max-width:900px;margin:16px auto 0;padding:14px 18px;background:var(--bg2);border:1px solid var(--card-line);border-radius:18px;font-size:15px;display:grid;gap:6px;margin-inline:max(16px,calc((100% - 900px)/2))}
.zh{font-family:var(--zh)}
.patterns{display:grid;grid-template-columns:repeat(auto-fill,minmax(190px,1fr));gap:8px;margin-top:4px}
.pattern{background:var(--cell);border:1px solid var(--cell-line);border-radius:12px;padding:8px 10px;display:flex;flex-direction:column;font-size:13px}.pattern small{color:var(--muted)}.pattern b{font-size:15px}.pattern .zh:not(b){font-size:20px;font-weight:700}
.py{color:var(--accent);font-family:Arial,sans-serif;direction:ltr;unicode-bidi:isolate}
.klabel{font-size:12px;color:var(--muted);font-weight:700}
.wcard.long .wtext .hz{font-size:clamp(22px,3.6vw,30px);letter-spacing:1px}
.extra{margin:10px 0 0;background:var(--bg2);border:1px solid var(--card-line);border-radius:14px;padding:4px 14px}
.extra summary{cursor:pointer;font-weight:700;padding:8px 0;color:var(--accent);list-style-position:inside}
.extra[open]{padding-bottom:12px}.extra .lbl{margin-top:10px;font-size:13px}
.story{display:grid;gap:4px}.story p{font-size:14.5px}
.evo{display:flex;gap:8px;overflow-x:auto;padding:4px 0}
.evo-step{flex:0 0 108px;display:flex;flex-direction:column;align-items:center;text-align:center;background:var(--cell);border:1px solid var(--cell-line);border-radius:12px;padding:8px 6px;color:inherit;text-decoration:none;font-size:12px}
.evo-step img{width:72px;height:72px;object-fit:contain;background:#fff;border-radius:8px}.evo-step .glyph{width:72px;height:72px;font-size:44px}
.evo-step b{margin-top:4px}.evo-step small{color:var(--muted);font-size:11px;line-height:1.4}.evo-step.now{border-color:var(--accent)}
.chips{display:flex;gap:6px;flex-wrap:wrap}.chip{background:var(--cell);border:1px solid var(--cell-line);border-radius:10px;padding:2px 10px;font-size:13px}
.exs{display:grid;gap:4px}.ex{display:flex;gap:10px;align-items:baseline;flex-wrap:wrap;font-size:14px}.ex b{font-size:19px}
.credit{font-size:11px;color:var(--muted);margin-top:8px}
.glyph{display:grid;place-items:center;width:74%;height:74%;font-size:clamp(34px,7vw,64px);line-height:1}
.glyph.zh{font-family:var(--zh);font-weight:700;color:var(--muted)}
.cell.pic img.cover{border-radius:14px;width:86%;height:86%;object-fit:cover}
body.hide-py .wcard .py,body.hide-py .intro .py{visibility:hidden}
/* quiz */
dialog.quiz{width:min(640px,calc(100vw - 20px))}
.quiz-head{display:flex;justify-content:space-between;align-items:center;padding-inline-end:40px}.quiz-head span{color:var(--muted);font-variant-numeric:tabular-nums}
.quiz-track{height:6px;background:var(--pill);border-radius:6px;overflow:hidden;margin:8px 0 16px}.quiz-track i{display:block;height:100%;width:0;background:var(--accent);transition:width .3s}
.quiz-q{font-size:18px;text-align:center;margin-bottom:12px}.big{font-size:1.6em}
.big-play{margin:0 auto 12px;width:64px;height:64px;font-size:24px}
.choices{display:grid;grid-template-columns:repeat(2,1fr);gap:10px}
.choice{background:var(--cell);border:2px solid var(--cell-line);border-radius:14px;padding:12px;min-height:64px;font-size:16px;font-weight:700;text-align:center}
.choice.right{border-color:var(--ok);background:color-mix(in srgb,var(--ok) 25%,var(--cell))}.choice.wrong{border-color:var(--danger);background:color-mix(in srgb,var(--danger) 25%,var(--cell))}
.choice .zh.big{font-size:30px}
.qcell-wrap{display:flex;justify-content:center}.qcell{width:min(300px,70vw);border:2px solid var(--cell-line);border-radius:16px;background-color:var(--cell)}
.qcell canvas{position:absolute;inset:0;width:100%;height:100%;touch-action:none;z-index:2}
.quiz-msg{text-align:center;font-weight:700;min-height:26px;margin-top:10px}.quiz-msg.ok{color:var(--ok)}.quiz-msg.bad{color:var(--danger)}
.quiz-foot{display:flex;justify-content:center;gap:10px}.quiz-foot .cta{margin-top:6px}
.quiz-end{text-align:center;display:grid;gap:8px;justify-items:center}.score{font-size:56px;font-weight:800}.score.ok{color:var(--ok)}.score.bad{color:var(--danger)}
@media(max-width:820px){.hero{grid-template-columns:1fr}.hero-img{min-height:0;max-height:240px}.worlds{grid-template-columns:1fr}.daily{grid-template-columns:1fr;justify-items:start}.stats{grid-template-columns:repeat(2,1fr)}}
@media(max-width:480px){.wtile{grid-template-columns:110px 1fr}.hero-text{padding:18px}.daily-chars span{width:46px;height:46px;font-size:24px}.choice .zh.big{font-size:26px}}
.feed{grid-template-columns:minmax(0,1fr)}.wcard,.extra,.intro{min-width:0}.evo{max-width:100%}
.gridwrap{direction:ltr}.cell.blank{opacity:.55}
.bar-title small{white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.cell .qbtn{z-index:1;pointer-events:none;width:24px;height:24px;font-size:12px;bottom:4px;inset-inline-end:4px;opacity:.85}

/* The notebook keeps its sound button; character explanations open beside it. */
.side-btns .round.line[data-a=study]{background:var(--pill);font-weight:800;color:var(--accent)}
.char-guide{display:flex;gap:6px;max-width:100%;overflow-x:auto;scrollbar-width:thin;margin:10px 0 2px;padding-bottom:3px}
.char-guide button{flex:0 0 auto;display:flex;align-items:center;gap:5px;background:var(--cell);border:1px solid var(--cell-line);border-radius:10px;padding:4px 9px;min-height:38px}
.char-guide button .zh{font-size:21px;font-weight:700}.char-guide button small{color:var(--muted)}
dialog.study{width:min(720px,calc(100vw - 20px))}
.study-heading{padding-inline-end:36px}.study-heading>div{display:flex;align-items:baseline;gap:12px}.study-char{font-size:54px}.study-py{font-size:22px}
.study-choices{display:flex;gap:6px;overflow-x:auto;margin:6px 0 12px}.study-choices:empty{display:none}
.study-choices .pill{min-width:64px}.study-choices .pill[aria-pressed=true]{border-color:var(--accent);background:color-mix(in srgb,var(--accent) 22%,var(--pill))}
.study-choices .zh{font-size:21px}.study-top{align-items:stretch}.study-side{flex:1;min-width:170px;gap:7px;align-items:stretch;justify-content:center}
.study-side .pill{text-align:center;min-height:42px}.study-speed{font-size:13px;color:var(--muted);display:grid;gap:2px}.study-speed input{width:100%;accent-color:var(--accent)}
.study-info{grid-template-columns:repeat(2,minmax(0,1fr))}.study-info .fact:nth-child(n+4){grid-column:1/-1}
.study-examples{display:grid;gap:4px}.study-examples>div{display:flex;align-items:baseline;gap:9px;flex-wrap:wrap}.study-examples small{direction:ltr;color:var(--accent);font-family:Arial,sans-serif}.study-examples .zh{font-size:18px}
@media(max-width:520px){.study-top{justify-content:center}.study-info{grid-template-columns:1fr}.study-info .fact:nth-child(n+4){grid-column:auto}.study-side{min-width:100%}.study-writer{width:220px;height:220px}.whead{grid-template-columns:auto minmax(0,1fr)}.whead>div:last-child:empty{display:none}.side-btns{gap:4px}.wtext .hz{overflow-wrap:anywhere}}

/* The Bimo world: supplied YuBao illustration and local fonts. */
body[data-theme=night]{--bg:#081A40;--bg2:#0A2456;--card:#102D66;--card-line:#2A4D89;--cell:#13336B;--cell-line:#446BA8;--guide:#365A90;--pill:#163A78;--pill-line:#446DA9;--muted:#C8D7F2;--accent:#F6C96E;--tpl:rgba(220,235,255,.37);--tpl-anim:#FFE7AA}
body{font-size:16px}
h1,h2,h3,.wbody b,.ltile small,.pill,.cta,.stat b,.top-link{font-family:var(--heading)}
#map{max-width:1200px;padding-inline:clamp(14px,3vw,32px)}
.topbar{gap:16px;min-height:74px}
.brand-logo{display:block;width:154px;height:60px;object-fit:contain;object-position:right center}
.brand-logo.dark{display:none}
body:not([data-theme=night]) .brand-logo.white{display:none}
body:not([data-theme=night]) .brand-logo.dark{display:block}
.top-actions{display:flex;align-items:center;gap:8px}
.top-link,.account-chip{border:1px solid var(--pill-line);background:var(--pill);border-radius:14px;min-height:48px;padding:7px 14px;font-weight:800}
.account-chip{display:flex;align-items:center;gap:8px;text-align:right;min-width:152px}
.account-chip span:not(.avatar){display:flex;flex-direction:column;line-height:1.25}
.account-chip small{font-size:11px;color:var(--muted);font-weight:400}
.avatar{display:inline-block;flex:0 0 auto;width:40px;height:40px;border-radius:50%;background-image:url('assets/lamzo-avatars.png');background-size:500% 200%;background-position:var(--ax) var(--ay);border:2px solid #96B8E6}
.avatar.large{width:70px;height:70px}
.hero{min-height:400px;display:block;border-radius:28px;isolation:isolate;background:#061A43;border:1px solid #4875B8;box-shadow:0 24px 70px #020B2555}
.hero-img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;object-position:center;z-index:-2}
.hero::after{content:"";position:absolute;inset:0;background:linear-gradient(270deg,#061638F0 1%,#061638A8 37%,#06163811 77%);z-index:-1}
.hero-text{width:min(52%,590px);padding:clamp(26px,4vw,52px);min-height:400px;display:flex;flex-direction:column;align-items:flex-start;justify-content:center}
.hero h1{font:900 clamp(32px,4.5vw,56px)/1.35 var(--heading);margin:10px 0}.hero h1 span{color:#F5C665}
.hero .eyebrow{background:#F6C96E22;border:1px solid #F6C96E77;border-radius:100px;padding:5px 14px;color:#FFE2A4}
.hero .lead{font-size:18px;line-height:1.85;color:#E1EBFF}
.hero .cta{box-shadow:0 10px 28px #0005}
.daily{position:relative;overflow:hidden;padding-inline-end:122px;min-height:130px}
.daily::after{content:"";position:absolute;inset-inline-end:8px;bottom:-18px;width:120px;height:120px;background:url('assets/brand/bimo-mascot.png') center/contain no-repeat;pointer-events:none}
.sec{font:800 23px var(--heading);margin-top:30px}
.worlds{gap:16px}
.wtile{grid-template-columns:minmax(150px,37%) 1fr;min-height:220px;border-radius:24px;box-shadow:0 10px 30px #03143322}
.wimg{overflow:hidden}.wimg img{object-fit:cover;transition:transform .25s}.wtile:hover .wimg img{transform:scale(1.04)}
.wbody{padding:18px 20px;gap:5px}.wbody b{font-size:22px;line-height:1.35}.wblurb{font-size:15px;line-height:1.75}.wmeta{font-size:13px}
.meter{height:8px;margin-top:8px}
.foot{display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;border-top:1px solid var(--card-line);padding-top:18px;margin-top:32px}
.lesson-progress{flex-basis:100%;color:var(--muted);font-size:14px}
.source-notes{margin-top:18px;font-size:13px;color:var(--muted)}.source-notes summary{cursor:pointer}
.account-intro{display:flex;align-items:center;gap:14px;padding:8px 30px 12px 0}.account-intro h2{font:800 22px var(--heading)}.account-intro p{font-size:14px;color:var(--muted)}
.avatar-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:7px}.avatar-grid button{border:2px solid var(--pill-line);border-radius:12px;background:var(--pill);display:flex;flex-direction:column;align-items:center;gap:3px;padding:7px 3px;min-width:0}.avatar-grid button.selected{border-color:var(--accent)}.avatar-grid small{font-size:10px;line-height:1.25}
.login-form{display:grid;gap:8px;margin-top:18px}.login-form h3{font-size:17px}.login-form label{display:grid;gap:2px;font-size:13px;font-weight:700}.login-form input{width:100%;border:1px solid var(--pill-line);border-radius:10px;background:var(--cell);padding:8px 12px;min-height:42px}
.form-error{min-height:18px;color:var(--danger);font-size:13px}.account-wide{width:100%;margin-top:4px}.account-links{text-align:center;margin-top:10px}.account-links a{color:var(--accent)}
.leader-list{max-height:55vh;overflow:auto}.leader-row{display:flex;align-items:center;gap:12px;padding:8px;border-bottom:1px solid var(--card-line)}.leader-row>b{width:22px}.leader-row>span:not(.avatar){flex:1}.leader-row strong{color:var(--accent)}
@media(max-width:820px){.hero{min-height:410px}.hero-text{width:70%;min-height:410px}.worlds{grid-template-columns:1fr}.wtile{min-height:200px}}
@media(max-width:600px){.topbar{flex-wrap:wrap}.brand-logo{width:126px;height:52px}.top-actions{margin-inline-start:auto}.top-link{font-size:12px;padding-inline:9px}.account-chip{min-width:0;padding:5px 7px}.account-chip .avatar{width:32px;height:32px}.account-chip small{display:none!important}.icon-btn{width:40px;height:40px}.hero{min-height:480px}.hero-img{object-position:33% center}.hero::after{background:linear-gradient(0deg,#061638FA 0%,#061638C4 39%,#06163822 77%)}.hero-text{width:100%;min-height:480px;justify-content:flex-end;padding:24px}.hero h1{font-size:34px}.hero .lead{font-size:15px;line-height:1.7}.daily{padding:16px 18px 92px}.daily::after{width:98px;height:98px;bottom:-14px}.daily-chars span{width:44px;height:44px}.wtile{grid-template-columns:115px 1fr;min-height:178px}.wbody{padding:12px}.wbody b{font-size:18px}.wblurb{font-size:13px;line-height:1.5}.bar{display:grid;grid-template-columns:auto minmax(0,1fr) auto;gap:6px}.bar-title{grid-column:2}.bar-actions{grid-column:1/-1;grid-row:2;display:flex;overflow-x:auto;max-width:100%;padding-bottom:2px;margin:0}.bar-actions .pill{flex-shrink:0}.bar .pill.done{grid-column:3}.avatar-grid{grid-template-columns:repeat(5,1fr)}.avatar-grid .avatar{width:34px;height:34px}}

/* Shared YuBao identity in the Bimo header. */
.mark{gap:14px;flex-shrink:0}
.bimo-lockup{display:flex;flex-direction:column;align-items:flex-start;gap:1px}
.bimo-lockup .brand-logo{width:160px;height:50px;object-position:right center}
.bimo-lockup small{font-size:11px;font-weight:800;line-height:1.3;color:var(--muted);padding-inline-start:4px}
.brand-divider{width:1px;height:42px;background:var(--pill-line)}
.yubao-brand-logo{display:block;width:112px;height:auto;max-height:39px;object-fit:contain}
body:not([data-theme=night]) .yubao-brand-logo{filter:brightness(0) saturate(100%) invert(10%) sepia(29%) saturate(2135%) hue-rotate(183deg) brightness(93%) contrast(96%)}
@media(max-width:600px){.mark{gap:9px}.bimo-lockup .brand-logo{width:125px;height:39px}.bimo-lockup small{font-size:9px}.brand-divider{height:34px}.yubao-brand-logo{width:84px;max-height:29px}}
.wtile{grid-template-columns:132px minmax(0,1fr);min-height:194px;color:var(--text);text-decoration:none}
.world-symbol{display:grid;place-items:center;background:radial-gradient(circle at 50% 45%,color-mix(in srgb,var(--hue) 23%,var(--card)),var(--bg2));color:var(--hue);border-inline-end:1px solid var(--card-line)}
.world-symbol svg{width:min(76px,70%);height:auto;filter:drop-shadow(0 7px 14px #0003)}
.world-symbol.hanzi{background:radial-gradient(circle at 50% 45%,#127B9580,var(--bg2))}
.world-symbol.phrase{background:radial-gradient(circle at 50% 45%,#A4336F80,var(--bg2))}
.world-symbol.measure{background:radial-gradient(circle at 50% 45%,#116E5680,var(--bg2))}
@media(max-width:600px){.wtile{grid-template-columns:96px minmax(0,1fr);min-height:176px}.world-symbol svg{width:63px}}