:root{
  --bg:#0b1020; --panel:#121a33; --panel2:#18224a; --line:#26315e;
  --text:#e8ecff; --muted:#9aa5d1; --pri:#5b8cff; --pri2:#8a5bff; --acc:#21d4a7;
  --warn:#ffb648; --bad:#ff5b7a; --gold:#e8c26a;
  --grad:linear-gradient(135deg,#5b8cff,#8a5bff);
  --radius:16px; --side:290px;
}
*{box-sizing:border-box;margin:0;padding:0}
html,body{height:100%}
body{font-family:'Tajawal',sans-serif;background:var(--bg);color:var(--text);line-height:1.8;
  background-image:radial-gradient(circle at 10% 0%,rgba(91,140,255,.15),transparent 40%),radial-gradient(circle at 90% 100%,rgba(138,91,255,.12),transparent 40%);background-attachment:fixed}
a{color:inherit;text-decoration:none;cursor:pointer}
button{font-family:inherit;cursor:pointer}
h2{font-size:1.7rem;font-weight:800;margin-bottom:.4rem}
h3{font-size:1.25rem;font-weight:700;margin:.6rem 0}
h4{font-size:1.08rem;color:#b9c6ff;margin:1.2rem 0 .5rem}
small{color:var(--muted)}

/* Topbar */
.topbar{position:sticky;top:0;z-index:50;display:flex;align-items:center;gap:1rem;padding:.7rem 1.2rem;background:rgba(11,16,32,.85);backdrop-filter:blur(12px);border-bottom:1px solid var(--line)}
.brand{display:flex;align-items:center;gap:.8rem;cursor:pointer;flex:1;min-width:0}
.brand h1{font-size:1.1rem;font-weight:800;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.brand span{font-size:.75rem;color:var(--muted);direction:ltr;display:block}
.logo{width:44px;height:44px;border-radius:12px;background:var(--grad);display:grid;place-items:center;font-size:1.3rem;flex-shrink:0;box-shadow:0 6px 20px rgba(91,140,255,.4)}
.presenter-chip{display:flex;align-items:center;gap:.6rem;background:var(--panel);padding:.35rem .9rem .35rem .4rem;border-radius:40px;border:1px solid var(--line)}
.presenter-chip small{display:block;font-size:.7rem;line-height:1}
.presenter-chip b{font-size:.88rem}
.avatar{width:120px;height:120px;border-radius:50%;background:linear-gradient(135deg,#e8c26a,#c48a2c);display:grid;place-items:center;font-family:'Amiri',serif;font-size:3.4rem;color:#1a1300;border:4px solid rgba(255,255,255,.15);flex-shrink:0}
.avatar.sm{width:36px;height:36px;font-size:1.1rem;border-width:2px}
.ring{--p:0;width:46px;height:46px;border-radius:50%;background:conic-gradient(var(--acc) calc(var(--p)*1%),var(--line) 0);display:grid;place-items:center}
.ring span{width:36px;height:36px;border-radius:50%;background:var(--bg);display:grid;place-items:center;font-size:.72rem;font-weight:700}
.icon-btn{background:var(--panel);border:1px solid var(--line);color:var(--text);width:42px;height:42px;border-radius:10px;font-size:1.1rem}
.menu-toggle{display:none}

/* Layout */
.layout{display:flex;min-height:calc(100vh - 66px)}
.sidebar{width:var(--side);flex-shrink:0;background:var(--panel);border-left:1px solid var(--line);padding:1rem .8rem;position:sticky;top:66px;height:calc(100vh - 66px);overflow-y:auto}
.nav-title{font-size:.75rem;color:var(--muted);margin:1.1rem .6rem .4rem;letter-spacing:.5px}
.nav-item{display:flex;align-items:center;gap:.7rem;padding:.6rem .8rem;border-radius:10px;font-size:.95rem;color:#cfd6f7;transition:.2s}
.nav-item:hover{background:var(--panel2)}
.nav-item.active{background:var(--grad);color:#fff}
.nav-item.danger{color:#ff9aac}
.nav-item i{width:20px;text-align:center}
.nav-mod{margin-bottom:.2rem}
.nav-mod .nav-item .chk{margin-inline-start:auto;font-size:.8rem;color:var(--acc)}
.nav-sub{padding-inline-start:1.6rem;display:none}
.nav-mod.open .nav-sub{display:block}
.nav-sub a{display:flex;gap:.5rem;align-items:center;padding:.35rem .6rem;font-size:.84rem;color:var(--muted);border-radius:8px}
.nav-sub a:hover{color:var(--text)}
.nav-sub a.active{color:#fff;background:var(--panel2)}
.nav-sub a i{font-size:.7rem}
.nav-sub a.done i{color:var(--acc)}
.main{flex:1;padding:2rem;min-width:0;outline:none;max-width:1200px;margin:0 auto;width:100%}
.backdrop{display:none}

/* Generic */
.card{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:1.5rem;margin-bottom:1.2rem}
.btn{display:inline-flex;align-items:center;gap:.5rem;padding:.7rem 1.4rem;border-radius:12px;border:none;font-weight:700;font-size:.98rem;background:var(--grad);color:#fff;transition:.2s}
.btn:hover{transform:translateY(-2px);box-shadow:0 8px 24px rgba(91,140,255,.35)}
.btn.ghost{background:transparent;border:1px solid var(--line);color:var(--text)}
.btn.ok{background:linear-gradient(135deg,#21d4a7,#16a085)}
.btn:disabled{opacity:.45;pointer-events:none}
.row{display:flex;gap:.8rem;flex-wrap:wrap;align-items:center}
.between{justify-content:space-between}
.badge{display:inline-block;padding:.15rem .7rem;border-radius:20px;font-size:.78rem;background:var(--panel2);border:1px solid var(--line);color:#c5cdf5}
.badge.ok{background:rgba(33,212,167,.15);color:var(--acc);border-color:rgba(33,212,167,.4)}
.grid{display:grid;gap:1.1rem}
.g2{grid-template-columns:repeat(auto-fit,minmax(300px,1fr))}
.g3{grid-template-columns:repeat(auto-fill,minmax(250px,1fr))}
.g4{grid-template-columns:repeat(auto-fit,minmax(170px,1fr))}
.bar{height:8px;background:var(--line);border-radius:10px;overflow:hidden}
.bar>div{height:100%;background:linear-gradient(90deg,var(--acc),var(--pri));border-radius:10px;transition:width .5s}

/* Hero */
.hero{position:relative;overflow:hidden;border-radius:24px;padding:2.6rem;background:linear-gradient(135deg,#1a2a6c 0%,#3b2a8a 55%,#5a2a8a 100%);border:1px solid #3a4590;margin-bottom:1.5rem}
.hero::after{content:"";position:absolute;inset:0;background-image:radial-gradient(rgba(255,255,255,.12) 1px,transparent 1px);background-size:22px 22px;mask-image:linear-gradient(to left,#000,transparent 70%);pointer-events:none}
.hero-inner{position:relative;z-index:1;display:flex;gap:2rem;align-items:center;flex-wrap:wrap}
.hero h2{font-size:2.4rem;line-height:1.3}
.hero .en{direction:ltr;text-align:right;font-size:1.15rem;color:#c8d1ff;font-weight:500;margin-bottom:1rem}
.hero p{color:#dbe1ff;max-width:640px}
.hero .presenter{display:flex;align-items:center;gap:1rem;margin:1.2rem 0}
.hero .presenter b{font-size:1.3rem;display:block}
.hero-art{flex:1;min-width:220px;display:flex;justify-content:center}
.stat{background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:1rem;text-align:center}
.stat b{font-size:1.7rem;display:block;background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.mod-card{cursor:pointer;transition:.25s;position:relative}
.mod-card:hover{transform:translateY(-4px);border-color:var(--pri)}
.mod-card .ic{width:50px;height:50px;border-radius:14px;background:rgba(91,140,255,.15);display:grid;place-items:center;font-size:1.3rem;color:var(--pri);margin-bottom:.6rem}
.mod-card .num{position:absolute;top:1rem;left:1rem;font-size:2rem;font-weight:800;color:var(--line)}
.mod-card .en{direction:ltr;text-align:right;font-size:.8rem;color:var(--muted)}

/* Lesson */
.crumbs{font-size:.85rem;color:var(--muted);margin-bottom:.8rem}
.crumbs a:hover{color:var(--text)}
.lesson-body{font-size:1.04rem}
.lesson-body p{margin:.6rem 0}
.lesson-body ul,.lesson-body ol{padding-inline-start:1.4rem;margin:.5rem 0}
.lesson-body li{margin:.3rem 0}
.tbl{width:100%;border-collapse:collapse;margin:1rem 0;font-size:.95rem;overflow:hidden;border-radius:12px}
.tbl th{background:var(--panel2);padding:.7rem;text-align:right;color:#c3ceff}
.tbl td{padding:.65rem .7rem;border-top:1px solid var(--line)}
.tbl tr:nth-child(even) td{background:rgba(255,255,255,.02)}
.table-wrap{overflow-x:auto}
.callout{background:rgba(91,140,255,.1);border-right:4px solid var(--pri);padding:1rem 1.2rem;border-radius:10px;margin:1rem 0}
.callout.warn{background:rgba(255,182,72,.1);border-color:var(--warn)}
.callout i{color:var(--pri);margin-left:.4rem}
.callout.warn i{color:var(--warn)}
.cards3{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:.8rem;margin:1rem 0}
.mini{background:var(--panel2);border:1px solid var(--line);border-radius:12px;padding:1rem;display:flex;flex-direction:column;gap:.3rem}
.mini i{font-size:1.4rem;color:var(--acc)}
.timeline{border-right:2px solid var(--line);margin:1rem .5rem;padding-right:1.2rem}
.timeline div{position:relative;margin-bottom:1rem}
.timeline div::before{content:"";position:absolute;right:-1.65rem;top:.55rem;width:12px;height:12px;border-radius:50%;background:var(--grad)}
.timeline span{display:inline-block;min-width:60px;font-weight:800;color:var(--acc);margin-left:.6rem}
.nested div{border:2px dashed var(--pri);border-radius:14px;padding:.7rem 1rem .5rem;margin-top:.5rem;font-weight:700;text-align:center}
.nested>div{border-color:#5b8cff}.nested>div>div{border-color:#8a5bff}.nested>div>div>div{border-color:#21d4a7}.nested>div>div>div>div{border-color:#e8c26a}
.steps{counter-reset:s;list-style:none;padding:0!important}
.steps li{counter-increment:s;position:relative;padding:.5rem 3rem .5rem .5rem;background:var(--panel2);border-radius:10px;margin:.5rem 0!important}
.steps li::before{content:counter(s);position:absolute;right:.6rem;top:.5rem;width:28px;height:28px;border-radius:50%;background:var(--grad);display:grid;place-items:center;font-weight:800;font-size:.85rem}
.formula{direction:ltr;text-align:center;font-family:monospace;font-size:1.2rem;background:#0a0f1f;border:1px solid var(--line);padding:1rem;border-radius:12px;margin:1rem 0;color:var(--acc)}
.video-sim{aspect-ratio:16/9;max-height:360px;width:100%;border-radius:16px;background:linear-gradient(135deg,#101935,#2a1f5a);display:flex;align-items:center;justify-content:center;flex-direction:column;gap:.6rem;position:relative;overflow:hidden;border:1px solid var(--line);margin-bottom:1.2rem}
.video-sim .play{width:70px;height:70px;border-radius:50%;background:rgba(255,255,255,.15);display:grid;place-items:center;font-size:1.6rem;border:2px solid rgba(255,255,255,.3);cursor:pointer;transition:.2s}
.video-sim .play:hover{transform:scale(1.1);background:var(--pri)}
.video-sim .vbar{position:absolute;bottom:0;left:0;right:0;height:5px;background:rgba(255,255,255,.1)}
.video-sim .vbar div{height:100%;background:var(--acc);width:0;transition:width .3s linear}
.video-sim .caption{position:absolute;bottom:18px;left:5%;right:5%;text-align:center;background:rgba(0,0,0,.55);padding:.5rem 1rem;border-radius:10px;font-size:.95rem;display:none}
.video-sim .wave{display:flex;gap:4px;height:30px;align-items:center}
.video-sim .wave i{display:block;width:4px;background:var(--acc);border-radius:2px;height:8px}
.video-sim.playing .wave i{animation:wv 1s infinite ease-in-out}
.video-sim .wave i:nth-child(2){animation-delay:.1s}.video-sim .wave i:nth-child(3){animation-delay:.2s}.video-sim .wave i:nth-child(4){animation-delay:.3s}.video-sim .wave i:nth-child(5){animation-delay:.4s}
@keyframes wv{50%{height:28px}}

/* Quiz */
.q-item{margin-bottom:1.3rem}
.q-item .q{font-weight:700;margin-bottom:.6rem}
.opt{display:block;width:100%;text-align:right;background:var(--panel2);border:1px solid var(--line);color:var(--text);padding:.7rem 1rem;border-radius:10px;margin:.4rem 0;font-size:.97rem;transition:.15s}
.opt:hover{border-color:var(--pri)}
.opt.sel{border-color:var(--pri);background:rgba(91,140,255,.18)}
.opt.right{border-color:var(--acc);background:rgba(33,212,167,.18)}
.opt.wrong{border-color:var(--bad);background:rgba(255,91,122,.18)}
.result{text-align:center;padding:2rem}
.result .score{font-size:3.5rem;font-weight:800}
.timer{font-family:monospace;font-size:1.2rem;background:var(--panel2);padding:.3rem .9rem;border-radius:10px;border:1px solid var(--line)}
.qnav{display:flex;flex-wrap:wrap;gap:.35rem}
.qnav button{width:34px;height:34px;border-radius:8px;border:1px solid var(--line);background:var(--panel2);color:var(--text);font-size:.8rem}
.qnav button.ans{background:rgba(91,140,255,.35)}
.qnav button.cur{outline:2px solid var(--acc)}

/* Labs */
.lab-tile{cursor:pointer;transition:.2s}
.lab-tile:hover{border-color:var(--acc);transform:translateY(-3px)}
.lab-tile .ic{font-size:1.8rem;color:var(--acc);margin-bottom:.4rem}
textarea,input[type=text],select{width:100%;background:#0a0f1f;border:1px solid var(--line);color:var(--text);padding:.8rem;border-radius:10px;font-family:inherit;font-size:1rem}
textarea{min-height:110px;resize:vertical}
input[type=range]{width:100%;accent-color:var(--pri)}
canvas{max-width:100%;border-radius:12px;background:#0a0f1f;border:1px solid var(--line);display:block}
.meter{height:22px;border-radius:12px;background:linear-gradient(90deg,var(--bad),var(--warn),var(--acc));position:relative;margin:1rem 0}
.meter .needle{position:absolute;top:-6px;width:6px;height:34px;background:#fff;border-radius:3px;transition:right .5s;transform:translateX(50%)}
.chips{display:flex;flex-wrap:wrap;gap:.4rem;margin:.6rem 0}
.chip{padding:.2rem .7rem;border-radius:20px;font-size:.85rem;background:var(--panel2);border:1px solid var(--line)}
.chip.pos{background:rgba(33,212,167,.2);border-color:var(--acc)}
.chip.neg{background:rgba(255,91,122,.2);border-color:var(--bad)}
.check-list li{list-style:none;margin:.3rem 0}
.check-list .y{color:var(--acc)}.check-list .n{color:var(--bad)}
.risk-btns{display:grid;grid-template-columns:repeat(auto-fit,minmax(130px,1fr));gap:.5rem;margin-top:1rem}
.risk-btns button{padding:.7rem;border-radius:10px;border:1px solid var(--line);background:var(--panel2);color:var(--text);font-weight:700}
.risk-btns .r0{border-color:#ff5b7a}.risk-btns .r1{border-color:#ff9248}.risk-btns .r2{border-color:#ffd248}.risk-btns .r3{border-color:#21d4a7}

/* Glossary */
.gl-item{background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:1rem}
.gl-item b{color:#b9c6ff}
.gl-item .en{direction:ltr;font-size:.8rem;color:var(--acc);float:left}

/* Certificate */
.cert{background:#fffdf6;color:#1b1b2f;border-radius:10px;padding:3rem 2.5rem;text-align:center;position:relative;border:12px double #c8a24a;font-family:'Tajawal'}
.cert h2{font-family:'Amiri',serif;font-size:2.6rem;color:#7a5a12}
.cert .name{font-family:'Amiri',serif;font-size:2.2rem;color:#1a2a6c;border-bottom:2px solid #c8a24a;display:inline-block;padding:0 2rem;margin:.8rem 0}
.cert .seal{position:absolute;bottom:1.8rem;left:2rem;width:95px;height:95px;border-radius:50%;background:radial-gradient(#e8c26a,#b28526);display:grid;place-items:center;color:#fff;font-size:2.2rem;box-shadow:0 0 0 6px rgba(200,162,74,.3)}
.cert .sig{display:flex;justify-content:space-around;margin-top:2.5rem;flex-wrap:wrap;gap:1rem}
.cert .sig div{border-top:1px solid #999;padding-top:.4rem;min-width:180px;font-size:.9rem}
.cert .sigfont{font-family:'Amiri',serif;font-size:1.5rem;color:#1a2a6c}

.toast{position:fixed;bottom:24px;left:50%;transform:translateX(-50%) translateY(120px);background:var(--panel2);border:1px solid var(--acc);padding:.8rem 1.4rem;border-radius:12px;z-index:100;transition:.35s;box-shadow:0 10px 30px rgba(0,0,0,.5)}
.toast.show{transform:translateX(-50%) translateY(0)}
.fade{animation:fd .35s ease}
@keyframes fd{from{opacity:0;transform:translateY(10px)}}

/* Responsive */
@media(max-width:900px){
  .menu-toggle{display:block}
  .sidebar{position:fixed;right:0;top:66px;z-index:60;transform:translateX(100%);transition:.3s;height:calc(100vh - 66px)}
  .sidebar.open{transform:none}
  .backdrop.show{display:block;position:fixed;inset:66px 0 0 0;background:rgba(0,0,0,.5);z-index:55}
  .presenter-chip{display:none}
  .main{padding:1rem}
  .hero{padding:1.5rem}
  .hero h2{font-size:1.7rem}
  .avatar{width:90px;height:90px;font-size:2.6rem}
  .cert{padding:2rem 1rem}
  .cert h2{font-size:1.8rem}.cert .name{font-size:1.6rem}
  .cert .seal{position:static;margin:1rem auto 0}
}
@media print{
  body *{visibility:hidden}
  .cert,.cert *{visibility:visible}
  .cert{position:absolute;inset:0;margin:0}
}