:root{--bg:#F2F5F3;--card:#fff;--ink:#14231F;--mute:#5E6F69;--brand:#0E4D45;--brand2:#E6F0EC;--gold:#D9A21B;--line:#D9E2DE;--danger:#B3261E}
*{box-sizing:border-box}
html,body{margin:0;min-height:100%}
body{font-family:Tajawal,system-ui,sans-serif;background:var(--bg);color:var(--ink);line-height:1.7;padding-bottom:calc(24px + env(safe-area-inset-bottom,0px));overflow-x:hidden}
button,input,select,textarea{font:inherit;color:inherit}
button{touch-action:manipulation}
header{background:var(--brand);color:#fff;padding:env(safe-area-inset-top,0px) 0 0;position:sticky;top:0;z-index:10}
.top{max-width:960px;margin:auto;display:flex;align-items:center;justify-content:space-between;gap:12px;padding:12px 20px}
.teacher{font-family:'Reem Kufi',Tajawal,sans-serif;font-size:1.25rem;font-weight:700;line-height:1.2}
.teacher small{display:block;font-family:Tajawal,sans-serif;font-weight:400;font-size:.8rem;opacity:.8}
.badge{border:2px solid var(--gold);color:var(--gold);border-radius:50%;width:42px;height:42px;display:grid;place-items:center;font-family:'Reem Kufi',sans-serif;font-size:1.3rem}
.tabs{max-width:960px;margin:0 auto 12px;display:flex;gap:6px;padding:0 16px;overflow-x:auto;overscroll-behavior-inline:contain;scrollbar-width:thin}
.tabs button{flex:1 0 auto;min-width:92px;min-height:48px;display:flex;align-items:center;justify-content:center;gap:7px;background:none;border:0;color:#fff;opacity:.78;padding:8px 14px;font-weight:700;border-bottom:3px solid transparent;cursor:pointer;white-space:nowrap}
.tabs button span:first-child{font-size:1.1rem;line-height:1}
.tabs button.on{opacity:1;border-color:var(--gold)}
main{width:min(100%,960px);margin:auto;padding:clamp(14px,3vw,28px)}
.bar{display:flex;justify-content:space-between;align-items:center;margin-bottom:12px}
h2{font-family:'Reem Kufi',Tajawal,sans-serif;margin:0;font-size:1.4rem}
.btn{background:var(--brand);color:#fff;border:0;border-radius:10px;padding:8px 14px;cursor:pointer;font-weight:500}
.btn.ghost{background:var(--brand2);color:var(--brand)}
.btn.danger{background:#fff;color:var(--danger);border:1px solid var(--danger)}
.btn.sm{padding:4px 10px;font-size:.85rem}
details.unit{background:var(--card);border:1px solid var(--line);border-radius:12px;margin-bottom:12px;overflow:hidden}
details.unit>summary{padding:14px 16px;font-weight:700;cursor:pointer;display:flex;justify-content:space-between;align-items:center;list-style:none}
details.unit>summary::-webkit-details-marker{display:none}
details.unit>summary::after{content:'‹';transition:transform .2s;font-size:1.3rem;color:var(--mute)}
details.unit[open]>summary::after{transform:rotate(-90deg)}
details.unit[open]>summary{background:var(--brand2)}
.count{font-weight:400;color:var(--mute);font-size:.85rem;margin-inline-start:8px}
.lesson{padding:14px 16px;border-top:1px solid var(--line)}
.lesson h3{margin:0 0 4px;font-size:1.05rem}
.note{background:#FFF7E0;border-inline-start:4px solid var(--gold);padding:8px 12px;border-radius:6px;white-space:pre-wrap;margin:8px 0}
.imgs{display:grid;grid-template-columns:repeat(auto-fill,minmax(min(100%,160px),1fr));gap:10px;margin:10px 0}
.imgs img{width:100%;height:clamp(120px,20vw,190px);object-fit:cover;border-radius:8px;border:1px solid var(--line);cursor:zoom-in}
.pdf{display:flex;align-items:center;gap:8px;padding:8px 12px;margin:6px 0;border:1px solid var(--line);border-radius:8px;text-decoration:none;color:var(--ink);background:#fff}
.pdf b{background:var(--danger);color:#fff;border-radius:4px;font-size:.7rem;padding:1px 6px}
.empty{text-align:center;color:var(--mute);padding:40px 0}
.panel{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:14px;margin-bottom:14px;display:grid;gap:8px}
.panel input,.panel textarea{border:1px solid var(--line);border-radius:8px;padding:8px 10px;width:100%;min-width:0;background:#fff}
.row{display:flex;flex-wrap:wrap;gap:8px;align-items:center;justify-content:space-between}
.row input{flex:1 1 220px}
.admin-lesson{display:flex;justify-content:space-between;gap:8px;align-items:center;padding:8px 16px;border-top:1px solid var(--line)}
.admin-lesson>span{min-width:0;overflow-wrap:anywhere}
.lightbox{position:fixed;inset:0;background:#000d;display:grid;place-items:center;z-index:50}
.lightbox img{max-width:94%;max-height:90%}
.toast{position:fixed;top:90px;inset-inline:0;margin:auto;width:max-content;max-width:90%;background:var(--ink);color:#fff;padding:8px 16px;border-radius:8px;z-index:60}
a.adminlink{display:block;text-align:center;color:var(--mute);font-size:.8rem;margin-top:24px}
:focus-visible{outline:3px solid var(--gold);outline-offset:2px}
@media (max-width:600px){
  header{position:sticky}
  .top{padding:10px 14px}
  .teacher{font-size:1.1rem}
  .badge{width:38px;height:38px}
  .tabs{gap:2px;padding:0 8px;margin-bottom:8px}
  .tabs button{min-width:78px;min-height:46px;padding:8px 10px;font-size:.9rem}
  main{padding:14px}
  .bar{gap:10px}
  .bar h2{font-size:1.2rem}
  .lesson{padding:12px}
  .imgs{grid-template-columns:repeat(auto-fill,minmax(min(100%,125px),1fr));gap:7px}
  .imgs img{height:clamp(105px,34vw,155px)}
  .panel{padding:12px}
  .row .btn{flex:0 0 auto}
  .admin-lesson{padding-inline:12px}
}
@media (max-width:360px){
  .tabs button{min-width:70px;padding-inline:7px;font-size:.85rem}
  main{padding:10px}
  details.unit>summary{padding:12px}
}
@media (prefers-reduced-motion:reduce){*,*::before,*::after{scroll-behavior:auto!important;transition:none!important}}
@media (prefers-color-scheme:dark){:root{--bg:#0F1715;--card:#17221F;--ink:#E8F0ED;--mute:#9BB0A9;--brand2:#1E302B;--line:#2A3B36}.pdf,.panel input,.panel textarea{background:#17221F}.note{background:#3A3217}.btn.danger{background:transparent}.btn.ghost{color:#8FD3C5}}