/* ========== أساسيات ========== */
:root{
  --bg:#0b0d12; --bg2:#10141c; --card:#141926; --card2:#1a2030;
  --line:rgba(255,255,255,.08); --line2:rgba(255,255,255,.14);
  --tx:#eef2f8; --tx2:#a8b2c4; --tx3:#6f7b90;
  --gold:#f0b429; --gold2:#ffd166; --green:#2ec27e; --red:#ff5d5d;
  --r:16px; --r2:22px;
  --safe-b:env(safe-area-inset-bottom,0px);
  --tab-h:62px; --crop:64px;
  --ff:'Tajawal',-apple-system,BlinkMacSystemFont,'Segoe UI',system-ui,'Helvetica Neue',sans-serif;
}
*,*::before,*::after{box-sizing:border-box}
html,body{margin:0;padding:0}
html{-webkit-text-size-adjust:100%}
body{
  background:var(--bg); color:var(--tx); font-family:var(--ff);
  font-size:16px; line-height:1.65; overflow-x:hidden;
  -webkit-font-smoothing:antialiased; text-rendering:optimizeLegibility;
  padding-bottom:calc(var(--tab-h) + var(--safe-b));
}
body.noscroll{overflow:hidden}
img,svg{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
button,input,textarea{font-family:inherit;font-size:inherit;color:inherit}
button{cursor:pointer;background:none;border:0;padding:0}
h1,h2,h3{margin:0;line-height:1.35;font-weight:800;letter-spacing:-.2px}
p{margin:0}
::selection{background:var(--gold);color:#17120a}
.wrap{max-width:1180px;margin:0 auto;padding:0 16px}
.flex{flex:1}
.i{width:20px;height:20px;fill:currentColor}
[hidden]{display:none !important}

/* ========== شريط علوي ========== */
.topbar{position:sticky;top:0;z-index:60;background:rgba(11,13,18,.82);backdrop-filter:saturate(1.3) blur(14px);-webkit-backdrop-filter:saturate(1.3) blur(14px)}
.topbar-in{max-width:1180px;margin:0 auto;padding:10px 16px;display:flex;align-items:center;gap:12px}
.brand{display:flex;align-items:center;gap:10px;min-width:0}
.brand-mark{border-radius:11px;flex:none}
.brand-text{display:flex;flex-direction:column;min-width:0}
.brand-text strong{font-size:14.5px;font-weight:800;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:46vw}
.brand-text small{font-size:11.5px;color:var(--tx3);line-height:1.2}
.topbar-right{margin-inline-start:auto;display:flex;align-items:center;gap:8px}
.prog-chip{position:relative;display:flex;align-items:center;justify-content:center;width:40px;height:40px}
.prog-chip span{position:absolute;font-size:10.5px;font-weight:700;color:var(--gold2)}
.ring{width:40px;height:40px;transform:rotate(-90deg) scaleX(-1)}
.ring circle{fill:none;stroke-width:2.6;r:15.5}
.ring-bg{stroke:rgba(255,255,255,.1)}
.ring-fg{stroke:var(--gold);stroke-linecap:round;stroke-dasharray:97.4;stroke-dashoffset:97.4;transition:stroke-dashoffset .5s ease}
.user-chip{width:38px;height:38px;border-radius:50%;display:grid;place-items:center;background:var(--card2);border:1px solid var(--line)}
.avatar{font-weight:800;font-size:15px;color:var(--gold2)}
.topbar-line{height:2px;background:rgba(255,255,255,.06)}
.topbar-line i{display:block;height:100%;width:0;background:linear-gradient(90deg,var(--gold),var(--gold2));transition:width .5s ease}

/* ========== الواجهة الرئيسية ========== */
.hero{position:relative;overflow:hidden;padding:30px 0 26px;border-bottom:1px solid var(--line)}
.hero-glow{position:absolute;inset:-40% 20% auto;height:420px;background:radial-gradient(60% 60% at 50% 40%,rgba(240,180,41,.22),transparent 70%);filter:blur(20px);pointer-events:none}
.hero-in{position:relative;max-width:1180px;margin:0 auto;padding:0 16px}
.pill{display:inline-block;font-size:12px;font-weight:700;color:var(--gold2);background:rgba(240,180,41,.1);border:1px solid rgba(240,180,41,.26);padding:5px 12px;border-radius:999px}
.hero h1{font-size:clamp(23px,6.4vw,42px);margin:14px 0 8px;max-width:820px}
.hero p{color:var(--tx2);font-size:clamp(14px,3.7vw,18px);max-width:620px}
.hero-stats{display:flex;align-items:center;gap:14px;margin:20px 0 16px;flex-wrap:wrap}
.stat{display:flex;align-items:baseline;gap:6px}
.stat b{font-size:20px;font-weight:800;color:var(--gold2)}
.stat span{font-size:13px;color:var(--tx3)}
.sep{width:1px;height:20px;background:var(--line2)}
.hero-bar{display:flex;align-items:center;gap:12px;max-width:560px}
.bar{flex:1;height:8px;border-radius:99px;background:rgba(255,255,255,.09);overflow:hidden}
.bar i{display:block;height:100%;width:0;border-radius:99px;background:linear-gradient(90deg,var(--gold),var(--gold2));transition:width .5s ease}
.hero-bar span{font-size:12.5px;color:var(--tx2);white-space:nowrap;font-weight:600}
.hero-cta{display:flex;gap:10px;margin-top:20px;flex-wrap:wrap}

/* ========== أزرار ========== */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border-radius:13px;padding:11px 18px;font-weight:700;font-size:14.5px;border:1px solid transparent;transition:transform .12s ease,background .2s,border-color .2s;white-space:nowrap}
.btn:active{transform:scale(.97)}
.btn-lg{padding:14px 24px;font-size:15.5px;border-radius:15px}
.btn-block{width:100%}
.btn-primary{background:linear-gradient(135deg,var(--gold),var(--gold2));color:#17120a;box-shadow:0 8px 24px -10px rgba(240,180,41,.7)}
.btn-ghost{border-color:var(--line2);color:var(--tx);background:rgba(255,255,255,.03)}
.btn-soft{background:var(--card2);border-color:var(--line);color:var(--tx2)}
.btn .i{width:18px;height:18px}

/* ========== قائمة الدروس ========== */
.list-head{display:flex;align-items:center;gap:12px;margin:26px 0 14px;flex-wrap:wrap}
.list-head h2{font-size:19px}
.search{margin-inline-start:auto;display:flex;align-items:center;gap:8px;background:var(--card);border:1px solid var(--line);border-radius:12px;padding:8px 12px;min-width:min(100%,260px)}
.search .i{width:17px;height:17px;fill:var(--tx3);flex:none}
.search input{border:0;background:none;outline:none;width:100%;font-size:14px}
.search input::placeholder{color:var(--tx3)}
.lesson-list{display:flex;flex-direction:column;gap:8px;padding-bottom:30px}
.sec-head{display:flex;align-items:center;gap:10px;margin:18px 0 6px;font-size:13px;font-weight:700;color:var(--tx3)}
.sec-head:first-child{margin-top:0}
.sec-head::after{content:"";flex:1;height:1px;background:var(--line)}
.sec-head em{font-style:normal;color:var(--gold2)}

.row{display:flex;align-items:center;gap:12px;background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:11px 12px;text-align:start;width:100%;transition:border-color .2s,background .2s,transform .12s}
.row:active{transform:scale(.993)}
.row:hover{border-color:var(--line2);background:var(--card2)}
.row.active{border-color:rgba(240,180,41,.55);background:linear-gradient(90deg,rgba(240,180,41,.09),transparent)}
.row-num{flex:none;width:38px;height:38px;border-radius:11px;display:grid;place-items:center;background:var(--bg2);border:1px solid var(--line);font-weight:800;font-size:14px;color:var(--tx2)}
.row.done .row-num{background:rgba(46,194,126,.14);border-color:rgba(46,194,126,.4);color:var(--green)}
.row-num svg{width:19px;height:19px;fill:var(--green)}
.row-body{min-width:0;flex:1}
.row-title{font-size:14.5px;font-weight:600;line-height:1.45;display:block;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.row-sub{display:flex;align-items:center;gap:8px;margin-top:3px;font-size:11.5px;color:var(--tx3)}
.row-sub .dot{width:3px;height:3px;border-radius:50%;background:var(--tx3)}
.row-sub .resume{color:var(--gold2);font-weight:700}
.row-mini{height:3px;border-radius:9px;background:rgba(255,255,255,.08);margin-top:7px;overflow:hidden}
.row-mini i{display:block;height:100%;background:var(--gold);border-radius:9px}
.row-go{flex:none;width:34px;height:34px;border-radius:50%;display:grid;place-items:center;background:rgba(255,255,255,.05);border:1px solid var(--line)}
.row-go svg{width:17px;height:17px;fill:var(--tx2)}
.row.active .row-go{background:var(--gold);border-color:transparent}
.row.active .row-go svg{fill:#17120a}
.empty{text-align:center;color:var(--tx3);padding:30px 0}

.foot{display:flex;align-items:center;gap:12px;justify-content:center;flex-wrap:wrap;padding:26px 16px 40px;border-top:1px solid var(--line);color:var(--tx3);font-size:12.5px;text-align:center}

/* ========== صفحة الدرس ========== */
.player-page{max-width:1420px;margin:0 auto;display:flex;flex-direction:column}
.player-main{min-width:0}
.stage{background:#000;position:relative}
.stage-ratio{position:relative;width:100%;aspect-ratio:16/9;background:#000;overflow:hidden}
/* نقصّ أعلى وأسفل إطار المشغّل لإخفاء شريط العنوان والشعار نهائيًا؛
   الفيديو نفسه يظهر كاملًا لأن المقصوص هو الهامش الأسود فقط */
.yt-host{position:absolute;inset-inline:0;top:calc(var(--crop) * -1);bottom:calc(var(--crop) * -1)}
.yt-host iframe{position:absolute;inset:0;width:100%;height:100%;border:0;pointer-events:none !important}

/* طبقة التحكم باللمس — تمنع أي نقر يصل لليوتيوب */
.touch{position:absolute;inset:0;display:flex;z-index:3}
.tap-zone{flex:1;position:relative;display:grid;place-items:center;-webkit-tap-highlight-color:transparent}
.tap-mid{flex:1.4}
.tap-hint{opacity:0;font-weight:800;font-size:15px;background:rgba(0,0,0,.55);border-radius:999px;padding:9px 14px;transition:opacity .25s}
.tap-zone.flash .tap-hint{opacity:1}

.poster{position:absolute;inset:0;z-index:4;background:#000;display:grid;place-items:center}
.poster img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;opacity:.5}
.big-play{position:relative;width:74px;height:74px;border-radius:50%;background:linear-gradient(135deg,var(--gold),var(--gold2));display:grid;place-items:center;box-shadow:0 14px 40px -12px rgba(240,180,41,.9)}
.big-play svg{width:34px;height:34px;fill:#17120a;margin-inline-start:4px}
.spinner{position:absolute;inset:0;z-index:5;display:grid;place-items:center;pointer-events:none}
.spinner i{width:42px;height:42px;border-radius:50%;border:3px solid rgba(255,255,255,.2);border-top-color:var(--gold);animation:spin .8s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}
.center-pulse{position:absolute;inset:0;z-index:4;display:grid;place-items:center;pointer-events:none;opacity:0}
.center-pulse svg{width:44px;height:44px;fill:#fff;background:rgba(0,0,0,.5);border-radius:50%;padding:16px;box-sizing:content-box}
.center-pulse.go{animation:pulse .55s ease}
@keyframes pulse{0%{opacity:0;transform:scale(.8)}35%{opacity:1;transform:scale(1)}100%{opacity:0;transform:scale(1.18)}}

/* شريط التحكم */
.controls{direction:ltr;position:absolute;inset-inline:0;bottom:0;z-index:6;padding:26px 10px 8px;background:linear-gradient(to top,rgba(0,0,0,.88),rgba(0,0,0,.45) 55%,transparent);transition:opacity .25s,transform .25s;opacity:1}
.controls.hide{opacity:0;transform:translateY(8px);pointer-events:none}
.seek{position:relative;height:26px;display:flex;align-items:center;padding:0 4px;touch-action:none}
.seek-track{position:relative;width:100%;height:5px;border-radius:9px;background:rgba(255,255,255,.26)}
.seek-buf,.seek-fill{position:absolute;inset-block:0;inset-inline-start:0;border-radius:9px}
.seek-buf{background:rgba(255,255,255,.22)}
.seek-fill{background:linear-gradient(90deg,var(--gold),var(--gold2));width:0}
.seek-knob{position:absolute;top:50%;inset-inline-start:0;width:13px;height:13px;margin-inline-start:-6.5px;border-radius:50%;background:var(--gold2);transform:translateY(-50%) scale(.9);box-shadow:0 0 0 4px rgba(240,180,41,.22)}
.seek input[type=range]{position:absolute;inset:0;width:100%;height:100%;opacity:0;margin:0;cursor:pointer;direction:ltr}
.ctl-row{display:flex;align-items:center;gap:2px;padding:2px 2px 0}
.ctl{position:relative;width:40px;height:40px;border-radius:12px;display:grid;place-items:center;color:#fff;transition:background .18s}
.ctl:hover{background:rgba(255,255,255,.12)}
.ctl svg{width:23px;height:23px;fill:#fff}
.ctl small{position:absolute;font-size:8.5px;font-weight:800;color:#fff;inset-block-start:16px}
.ctl-text{width:auto;padding:0 10px;font-weight:800;font-size:13px;min-width:40px}
.time{display:flex;align-items:center;gap:4px;font-size:12.5px;color:#e7ebf3;font-variant-numeric:tabular-nums;padding:0 6px;direction:ltr}
.time i{opacity:.5;font-style:normal}
.vol{display:none;align-items:center;gap:6px}
.vol input[type=range]{width:78px;height:4px;-webkit-appearance:none;appearance:none;background:rgba(255,255,255,.3);border-radius:9px;direction:ltr}
.vol input[type=range]::-webkit-slider-thumb{-webkit-appearance:none;width:12px;height:12px;border-radius:50%;background:#fff}
.vol input[type=range]::-moz-range-thumb{width:12px;height:12px;border:0;border-radius:50%;background:#fff}
.speed{position:relative}
.menu{position:absolute;bottom:48px;inset-inline-end:0;background:rgba(18,22,31,.97);border:1px solid var(--line2);border-radius:13px;padding:6px;display:flex;flex-direction:column;min-width:124px;box-shadow:0 18px 44px -14px #000;z-index:9}
.menu button{padding:9px 12px;border-radius:9px;text-align:center;font-size:13.5px;font-weight:600;color:var(--tx2)}
.menu button:hover{background:rgba(255,255,255,.08)}
.menu button.on{color:var(--gold2);background:rgba(240,180,41,.1)}

.endcard{position:absolute;inset:0;z-index:8;background:rgba(6,8,12,.985);display:grid;place-items:center;padding:16px;text-align:center}
.endcard-in{max-width:360px}
.done-badge{width:58px;height:58px;border-radius:50%;margin:0 auto 12px;display:grid;place-items:center;background:rgba(46,194,126,.16);border:1px solid rgba(46,194,126,.45)}
.done-badge svg{width:30px;height:30px;fill:var(--green)}
.endcard h3{font-size:19px}
.endcard p{color:var(--tx2);font-size:13.5px;margin:6px 0 16px}
.endcard-cta{display:flex;gap:8px;justify-content:center;flex-wrap:wrap}

.lesson-meta{padding:16px}
.crumbs{display:flex;align-items:center;gap:7px;font-size:12px;color:var(--tx3);margin-bottom:8px}
.crumbs a{color:var(--gold2);font-weight:600}
.crumbs em{font-style:normal}
.lesson-meta h1{font-size:clamp(18px,4.6vw,25px)}
.meta-row{display:flex;align-items:center;gap:7px;margin-top:10px;flex-wrap:wrap}
.tag{font-size:11.5px;font-weight:700;padding:5px 11px;border-radius:999px;background:rgba(240,180,41,.12);color:var(--gold2);border:1px solid rgba(240,180,41,.25)}
.tag-soft{background:var(--card2);color:var(--tx2);border-color:var(--line)}
.tag-done{background:rgba(46,194,126,.13);color:var(--green);border-color:rgba(46,194,126,.35)}
.lesson-nav{display:flex;gap:8px;margin-top:16px;flex-wrap:wrap}
.lesson-nav .btn{flex:1;min-width:132px}

.card{background:var(--card);border:1px solid var(--line);border-radius:var(--r2);padding:16px;margin-top:18px}
.notes-head{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-bottom:10px}
.notes-head h3{font-size:15px}
.stars{display:flex;gap:2px;direction:ltr}
.stars button{font-size:21px;line-height:1;color:rgba(255,255,255,.2);transition:color .15s,transform .15s}
.stars button:active{transform:scale(1.2)}
.stars button.on{color:var(--gold2)}
#noteBox{width:100%;background:var(--bg2);border:1px solid var(--line);border-radius:13px;padding:11px 13px;resize:vertical;outline:none;font-size:14px;line-height:1.7}
#noteBox:focus{border-color:rgba(240,180,41,.45)}
#noteBox::placeholder{color:var(--tx3)}
.notes-foot{min-height:18px;margin-top:6px}
.saved-hint{font-size:11.5px;color:var(--green);opacity:0;transition:opacity .3s}
.saved-hint.show{opacity:1}

/* القائمة الجانبية */
.player-side{border-top:1px solid var(--line);padding:16px}
.side-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:10px}
.side-head h3{font-size:15px}
.side-head span{font-size:12px;color:var(--tx3);font-weight:700}
.side-list{display:flex;flex-direction:column;gap:7px}

/* ========== شريط الجوال ========== */
.tabbar{position:fixed;inset-inline:0;bottom:0;z-index:70;height:calc(var(--tab-h) + var(--safe-b));padding-bottom:var(--safe-b);display:flex;background:rgba(13,16,23,.94);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);border-top:1px solid var(--line)}
.tab{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:3px;color:var(--tx3);font-size:10.5px;font-weight:700}
.tab svg{width:22px;height:22px;fill:currentColor}
.tab.on{color:var(--gold2)}

/* ========== نوافذ ========== */
.modal{position:fixed;inset:0;z-index:100;display:grid;place-items:center;padding:16px}
.modal-bg{position:absolute;inset:0;background:rgba(5,7,11,.82);backdrop-filter:blur(7px);-webkit-backdrop-filter:blur(7px)}
.modal-card{position:relative;width:100%;max-width:400px;background:linear-gradient(180deg,var(--card2),var(--card));border:1px solid var(--line2);border-radius:26px;padding:26px 22px;text-align:center;box-shadow:0 30px 70px -20px #000;animation:pop .28s cubic-bezier(.2,.9,.3,1.2)}
@keyframes pop{from{opacity:0;transform:translateY(16px) scale(.96)}}
.modal-x{position:absolute;inset-block-start:14px;inset-inline-end:16px;color:var(--tx3);font-size:15px}
.lock{width:56px;height:56px;border-radius:18px;margin:0 auto 14px;display:grid;place-items:center;background:rgba(240,180,41,.12);border:1px solid rgba(240,180,41,.3)}
.lock svg{width:28px;height:28px;fill:var(--gold2)}
.modal-card h2{font-size:20px}
.gate-sub{color:var(--tx2);font-size:13.5px;margin:7px 0 18px}
.field{display:block;text-align:start;margin-bottom:12px}
.field>span{display:block;font-size:12.5px;font-weight:700;color:var(--tx2);margin-bottom:6px}
.field input{width:100%;background:var(--bg2);border:1px solid var(--line2);border-radius:13px;padding:13px 14px;outline:none;font-size:15px;transition:border-color .2s}
.field input:focus{border-color:rgba(240,180,41,.55)}
.field input::placeholder{color:var(--tx3)}
.pw{position:relative;display:block}
.pw button{position:absolute;inset-inline-end:8px;top:50%;transform:translateY(-50%);width:34px;height:34px;display:grid;place-items:center;border-radius:9px}
.pw button svg{width:19px;height:19px;fill:var(--tx3)}
.pw button.on svg{fill:var(--gold2)}
.pw input{padding-inline-end:48px}
.gate-err{color:var(--red);font-size:12.5px;margin:0 0 10px;text-align:start;font-weight:600}
.gate-note{font-size:11.5px;color:var(--tx3);margin-top:12px;line-height:1.6}
.me-avatar{width:62px;height:62px;border-radius:50%;margin:0 auto 12px;display:grid;place-items:center;font-size:25px;font-weight:800;color:#17120a;background:linear-gradient(135deg,var(--gold),var(--gold2))}
.me-mail{color:var(--tx2);font-size:13px;margin:4px 0 16px;word-break:break-all}
.me-stats{display:flex;gap:8px;margin-bottom:16px}
.me-stats>div{flex:1;background:var(--bg2);border:1px solid var(--line);border-radius:15px;padding:11px 6px}
.me-stats b{display:block;font-size:17px;color:var(--gold2)}
.me-stats span{font-size:10.5px;color:var(--tx3)}

.toast{position:fixed;inset-inline:0;bottom:calc(var(--tab-h) + var(--safe-b) + 14px);z-index:120;margin:0 auto;width:max-content;max-width:88vw;background:rgba(20,25,36,.97);border:1px solid var(--line2);border-radius:14px;padding:11px 18px;font-size:13.5px;font-weight:600;box-shadow:0 16px 40px -12px #000;animation:pop .25s ease}
.sheet-bg{position:fixed;inset:0;z-index:65;background:rgba(5,7,11,.6)}

/* ========== قائمة الدروس كـ sheet على الجوال ========== */
@media (max-width:1023px){
  .player-side{position:fixed;inset-inline:0;bottom:0;z-index:66;max-height:76vh;background:var(--bg2);border-top:1px solid var(--line2);border-radius:24px 24px 0 0;padding:14px 14px calc(18px + var(--safe-b));transform:translateY(102%);transition:transform .3s cubic-bezier(.2,.9,.3,1);overflow:auto;box-shadow:0 -20px 50px -20px #000}
  .player-side.open{transform:none}
  .player-side::before{content:"";display:block;width:44px;height:4px;border-radius:9px;background:var(--line2);margin:0 auto 12px}
}

/* ========== سطح المكتب ========== */
@media (min-width:700px){
  :root{--crop:74px}
  .vol{display:flex}
  .lesson-meta{padding:22px 24px}
  .stage-ratio{border-radius:0}
}
@media (min-width:1024px){
  :root{--crop:86px}
  body{padding-bottom:0}
  .tabbar{display:none}
  .player-page{flex-direction:row;gap:22px;padding:22px}
  .player-main{flex:1}
  .stage-ratio{border-radius:20px;box-shadow:0 26px 60px -24px #000}
  .lesson-meta{padding:20px 2px 40px}
  .player-side{width:366px;flex:none;border:1px solid var(--line);border-radius:22px;background:var(--card);padding:16px;position:sticky;top:78px;max-height:calc(100vh - 100px);display:flex;flex-direction:column}
  .side-list{overflow:auto;padding-inline-end:4px;margin-inline-end:-4px}
  .side-list::-webkit-scrollbar{width:6px}
  .side-list::-webkit-scrollbar-thumb{background:var(--line2);border-radius:9px}
  .sheet-bg{display:none !important}
  .row-title{white-space:normal;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical}
}
@media (min-width:1024px) and (display-mode:browser){ .hero h1{max-width:760px} }

/* ملء الشاشة */
.stage:fullscreen{width:100vw;height:100vh;display:grid;place-items:center;background:#000}
.stage:fullscreen .stage-ratio{width:min(100vw,calc(100vh * 16 / 9));height:auto;aspect-ratio:16/9;border-radius:0}
@media (prefers-reduced-motion:reduce){*{animation-duration:.01ms !important;transition-duration:.01ms !important}}

/* ملء شاشة بديل (iPhone) */
body.pseudo-fs{overflow:hidden}
body.pseudo-fs .stage{position:fixed;inset:0;z-index:200;display:grid;place-items:center;background:#000}
body.pseudo-fs .stage-ratio{width:min(100vw,calc(100vh * 16 / 9));height:auto;aspect-ratio:16/9;border-radius:0}
body.pseudo-fs .topbar,body.pseudo-fs .tabbar{display:none}

/* عند الإيقاف: حجاب خفيف يمنع ظهور أي عنوان/شعار من المصدر */
.stage.paused .poster img{opacity:.32}
.poster{transition:opacity .15s}

/* ========== قسم المحتوى التعريفي (SEO) ========== */
.seo{padding-top:8px;padding-bottom:34px;border-top:1px solid var(--line);margin-top:10px}
.seo h2{font-size:20px;margin:26px 0 10px}
.seo h3{font-size:16px;margin:22px 0 8px;color:var(--gold2)}
.seo p{color:var(--tx2);font-size:14.5px;line-height:1.95}
.seo strong{color:var(--tx);font-weight:700}
.seo-list{margin:0;padding-inline-start:20px;color:var(--tx2);font-size:14.5px;line-height:1.95}
.seo-list li{margin-bottom:4px}
.faq details{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:12px 14px;margin-bottom:8px}
.faq summary{cursor:pointer;font-weight:700;font-size:14.5px;list-style:none}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";float:left;color:var(--gold2);font-weight:800}
.faq details[open] summary::after{content:"–"}
.faq details p{margin-top:8px;font-size:14px}

/* ========== أزرار الرجوع ========== */
.backbtn{display:flex;align-items:center;gap:4px;background:var(--card2);border:1px solid var(--line);border-radius:12px;padding:7px 12px 7px 10px;font-size:13px;font-weight:700;color:var(--tx);flex:none;transition:background .18s,transform .12s}
.backbtn:active{transform:scale(.95)}
.backbtn:hover{background:rgba(255,255,255,.1)}
.backbtn svg{width:18px;height:18px;fill:var(--gold2)}
.stage-top{position:absolute;inset-inline:0;top:0;z-index:7;padding:10px 12px;background:linear-gradient(to bottom,rgba(0,0,0,.72),transparent);transition:opacity .25s,transform .25s;display:flex}
.stage-top.hide{opacity:0;transform:translateY(-8px);pointer-events:none}
.stage-back{display:flex;align-items:center;gap:5px;background:rgba(0,0,0,.5);border:1px solid rgba(255,255,255,.18);backdrop-filter:blur(6px);-webkit-backdrop-filter:blur(6px);border-radius:999px;padding:7px 14px 7px 12px;color:#fff;font-size:12.5px;font-weight:700}
.stage-back:active{transform:scale(.95)}
.stage-back svg{width:17px;height:17px;fill:#fff}
.gate-later{margin-top:8px;font-size:13.5px;padding:11px 18px}
.modal-x{width:32px;height:32px;border-radius:50%;background:rgba(255,255,255,.07);border:1px solid var(--line)}
.modal-x:hover{background:rgba(255,255,255,.14);color:var(--tx)}
@media (max-width:460px){
  body.in-lesson .brand-text{display:none}   /* نُفسح مكانًا لزر الرجوع داخل الدرس */
  .brand-text small{display:none}
}
.row.flash-row{border-color:rgba(240,180,41,.6);background:linear-gradient(90deg,rgba(240,180,41,.12),transparent)}