:root{
  --sky:#7FB2E8;--sky-d:#4A82C4;--sky-l:#B9D6F2;--mist:#E3EEF9;--wash:#F2F7FC;
  --ink:#2F4A72;--ink-soft:#43597f;--muted:#6E83A6;--line:#DCE7F4;
  --glow:#F0C070;--coral:#E89684;--mint:#79C6B8;--lilac:#B0A4DC;
  --paper:#FFFFFF;--bg:#EEF4FB;
  --sh:0 12px 40px -14px rgba(51,80,122,.20);--sh-sm:0 6px 20px -10px rgba(51,80,122,.16);
}
*{box-sizing:border-box} html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--ink-soft);
  font-family:'IBM Plex Sans Arabic','Plus Jakarta Sans',system-ui,sans-serif;font-size:17px;line-height:1.75;-webkit-font-smoothing:antialiased}
h1,h2,h3,h4{font-family:'Plus Jakarta Sans','IBM Plex Sans Arabic',system-ui,sans-serif;color:var(--ink);margin:0;line-height:1.25}
.wrap{max-width:1080px;margin:0 auto;padding:0 20px}
a{color:inherit;text-decoration:none}
svg{max-width:100%}

/* PROGRESS + BOOKMARK BAR (top) */
.topbar{position:fixed;top:0;left:0;right:0;z-index:60;background:rgba(255,255,255,.94);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.topbar-in{max-width:1080px;margin:0 auto;padding:0 16px;display:flex;align-items:center;gap:12px;height:52px}
.tb-mk{width:30px;height:32px;flex-shrink:0}
.tb-name{font-family:'Plus Jakarta Sans',system-ui,sans-serif;font-weight:700;color:var(--ink);font-size:14px;flex-shrink:0}
.tb-spacer{flex:1}
.tb-pct{font-family:'Plus Jakarta Sans',system-ui,sans-serif;font-weight:700;font-size:13px;color:var(--sky-d);min-width:42px;text-align:right}
.tb-btn{font-family:'Plus Jakarta Sans',system-ui,sans-serif;font-size:12px;font-weight:600;cursor:pointer;border:1px solid var(--line);background:#fff;color:var(--sky-d);border-radius:8px;padding:7px 12px;display:flex;align-items:center;gap:6px;transition:.2s}
.tb-btn:hover{border-color:var(--sky);background:var(--wash)}
.tb-btn svg{width:14px;height:14px}
.progress-track{position:absolute;left:0;bottom:-1px;height:3px;width:100%;background:var(--line)}
.progress-fill{height:100%;width:0;background:linear-gradient(90deg,var(--sky),var(--mint));transition:width .25s}
.toast{position:fixed;left:50%;top:64px;transform:translateX(-50%) translateY(-14px);z-index:70;background:var(--ink);color:#fff;
  font-family:'Plus Jakarta Sans',system-ui,sans-serif;font-size:13px;padding:10px 18px;border-radius:100px;opacity:0;pointer-events:none;transition:.3s;box-shadow:var(--sh)}
.toast.show{opacity:1;transform:translateX(-50%) translateY(0)}
body{padding-top:52px}

/* COVER */
.cover{position:relative;min-height:calc(100vh - 52px);display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;overflow:hidden;
  background:radial-gradient(900px 600px at 50% -6%, #FFFFFF 0%, var(--wash) 44%, var(--mist) 100%)}
.cover::before{content:"";position:absolute;inset:0;pointer-events:none;
  background-image:radial-gradient(circle at 14% 24%, rgba(127,178,232,.14),transparent 42%),
   radial-gradient(circle at 86% 72%, rgba(143,208,196,.12),transparent 42%)}
.cover .rings{position:absolute;left:50%;top:44%;transform:translate(-50%,-50%);z-index:0;opacity:.45;width:560px;max-width:120vw}
.cover-inner{position:relative;z-index:2;padding:40px 20px;animation:rise .9s cubic-bezier(.2,.7,.2,1) both}
@keyframes rise{from{opacity:0;transform:translateY(18px)}to{opacity:1;transform:none}}
.brand-row{display:flex;align-items:center;justify-content:center;gap:12px;margin-bottom:6px}
.brand-row .mk{width:56px;height:60px}
.brand-name{font-family:'Plus Jakarta Sans',system-ui,sans-serif;font-weight:700;letter-spacing:.09em;font-size:clamp(21px,4vw,32px);color:var(--ink)}
.brand-sub{font-family:'Plus Jakarta Sans',system-ui,sans-serif;font-size:10.5px;letter-spacing:.36em;color:var(--sky-d);text-transform:uppercase;margin-bottom:40px}
.cover-mark{width:150px;height:161px;margin:0 auto 26px;filter:drop-shadow(0 14px 26px rgba(74,130,196,.16))}
.title-xl{font-family:'Plus Jakarta Sans',system-ui,sans-serif;font-weight:700;font-size:clamp(42px,8.5vw,80px);letter-spacing:.01em;line-height:1;color:var(--ink);margin-bottom:12px}
.title-sub{font-family:'Plus Jakarta Sans',system-ui,sans-serif;font-weight:400;font-style:italic;font-size:clamp(18px,3vw,25px);color:var(--sky-d);margin-bottom:18px}
.ar-tag{direction:rtl;font-family:'Plus Jakarta Sans',system-ui,sans-serif;font-size:clamp(14px,2.4vw,16px);color:var(--mint);font-weight:600;margin-bottom:26px;max-width:32ch;margin-left:auto;margin-right:auto;line-height:1.9}
.cover-badge{display:inline-block;font-family:'Plus Jakarta Sans',system-ui,sans-serif;font-size:13px;color:var(--ink);background:rgba(255,255,255,.8);border:1px solid var(--line);padding:9px 20px;border-radius:100px}
.cover-badge b{color:var(--sky-d);font-weight:700}
.scroll-cue{position:absolute;bottom:20px;left:50%;transform:translateX(-50%);z-index:2;font-family:'Plus Jakarta Sans',system-ui,sans-serif;font-size:10.5px;letter-spacing:.26em;text-transform:uppercase;color:var(--muted);display:flex;flex-direction:column;align-items:center;gap:6px;animation:bob 2.4s ease-in-out infinite}
.scroll-cue span{width:1px;height:26px;background:linear-gradient(var(--sky-d),transparent)}
@keyframes bob{0%,100%{transform:translateX(-50%)}50%{transform:translateX(-50%) translateY(6px)}}

/* MOTIVATION PAGE (no symbols) */
.motiv-page{background:linear-gradient(160deg,var(--wash),var(--mist));padding:80px 0}
.motiv-card{max-width:640px;margin:0 auto;background:#fff;border:1px solid var(--line);border-radius:22px;padding:52px 42px;box-shadow:var(--sh);text-align:center;position:relative;overflow:hidden}
.motiv-card::before{content:"";position:absolute;top:0;left:0;right:0;height:4px;background:linear-gradient(90deg,var(--sky),var(--mint),var(--glow))}
.motiv-mk{width:56px;height:60px;margin:0 auto 24px}
.motiv-en{font-family:'Plus Jakarta Sans',system-ui,sans-serif;font-size:clamp(19px,3.2vw,25px);color:var(--ink);line-height:1.55;font-weight:700;margin:0 0 6px}
.motiv-en .go{color:var(--sky-d)}
.motiv-sub{font-family:'Plus Jakarta Sans',system-ui,sans-serif;font-style:italic;font-size:17px;color:var(--mint);margin:0 0 30px}
.motiv-divider{width:60px;height:2px;background:var(--sky-l);margin:0 auto 30px;border-radius:2px}
.motiv-ar{direction:rtl;font-family:'Plus Jakarta Sans',system-ui,sans-serif;font-size:clamp(18px,3.2vw,23px);color:var(--ink);line-height:1.75;font-weight:600;margin:0}
.motiv-ar .go{color:var(--sky-d)}
.motiv-ar-sub{direction:rtl;font-family:'Plus Jakarta Sans',system-ui,sans-serif;font-size:16px;color:var(--mint);margin:6px 0 0;font-weight:600}
.motiv-by{margin-top:30px;font-family:'Plus Jakarta Sans',system-ui,sans-serif;font-size:12.5px;letter-spacing:.18em;text-transform:uppercase;color:var(--muted)}
.motiv-by b{color:var(--sky-d);font-weight:700}

/* CONTENTS PAGE (numbered) */
.contents{background:var(--paper);padding:70px 0;border-top:1px solid var(--line)}
.contents-h{text-align:center;margin-bottom:40px}
.contents-h .k{font-family:'Plus Jakarta Sans',system-ui,sans-serif;font-size:12px;letter-spacing:.3em;text-transform:uppercase;color:var(--sky-d);font-weight:700}
.contents-h h2{font-size:clamp(28px,5vw,42px);font-weight:700;margin-top:6px}
.contents-h p{color:var(--muted);max-width:52ch;margin:8px auto 0}
.ct-sec{border:1px solid var(--line);border-radius:18px;margin-bottom:18px;overflow:hidden;box-shadow:var(--sh-sm)}
.ct-head{display:flex;align-items:center;gap:16px;padding:18px 22px;background:linear-gradient(180deg,var(--wash),#fff);transition:.2s}
.ct-head:hover{background:var(--mist)}
.ct-sn{font-family:'Plus Jakarta Sans',system-ui,sans-serif;font-weight:700;font-size:26px;color:var(--sky-d);min-width:42px}
.ct-ht{flex:1;display:flex;flex-direction:column}
.ct-title{font-family:'Plus Jakarta Sans',system-ui,sans-serif;font-weight:700;font-size:19px;color:var(--ink)}
.ct-tag{font-size:14px;color:var(--muted);font-style:italic}
.ct-secq{font-family:'Plus Jakarta Sans',system-ui,sans-serif;font-size:12px;font-weight:700;color:#fff;background:var(--sky-d);padding:6px 12px;border-radius:100px;white-space:nowrap}
.ct-list{list-style:none;margin:0;padding:8px 22px 18px}
.ct-list li{border-bottom:1px dashed var(--line)}
.ct-list li:last-child{border-bottom:none}
.ct-topic-link{display:flex;align-items:center;gap:12px;padding:10px 8px;font-size:16px;color:var(--ink-soft);text-decoration:none;border-radius:9px;transition:.15s;margin:1px 0}
.ct-topic-link:hover{background:var(--mist);color:var(--ink);padding-left:14px}
.ct-topic-name{flex:1}
.ct-num{font-family:'Plus Jakarta Sans',system-ui,sans-serif;font-weight:700;font-size:13px;color:var(--sky-d);min-width:34px}
.ct-q{margin-left:auto;font-family:'Plus Jakarta Sans',system-ui,sans-serif;font-size:12px;font-weight:600;color:var(--mint)}

/* SECTION BLOCK */
.section-block{background:var(--paper);border-top:3px solid var(--sky-l)}
.section-block:nth-of-type(even){background:var(--wash)}
.sec-intro{padding:62px 0 24px}
.sec-kicker{font-family:'Plus Jakarta Sans',system-ui,sans-serif;font-size:12px;letter-spacing:.3em;text-transform:uppercase;color:var(--sky-d);font-weight:700}
.sec-no{font-family:'Plus Jakarta Sans',system-ui,sans-serif;font-weight:700;font-size:clamp(36px,7vw,58px);color:var(--sky-l);line-height:1}
.sec-title{font-size:clamp(25px,5vw,40px);font-weight:700;margin:2px 0 10px}
.sec-lead{color:var(--muted);max-width:60ch;font-size:18px}
.toc{margin-top:28px;background:#fff;border:1px solid var(--line);border-radius:18px;box-shadow:var(--sh-sm);overflow:hidden}
.toc-item{display:flex;align-items:center;gap:14px;padding:14px 20px;border-bottom:1px solid var(--line);transition:.2s}
.toc-item:last-child{border-bottom:none}
.toc-item:hover{background:var(--wash);padding-left:26px}
.toc-n{font-family:'Plus Jakarta Sans',system-ui,sans-serif;font-weight:700;font-size:16px;color:var(--sky-d);min-width:38px}
.toc-title{flex:1;font-family:'Plus Jakarta Sans',system-ui,sans-serif;font-weight:400;font-size:17px;color:var(--ink)}
.toc-q{font-family:'Plus Jakarta Sans',system-ui,sans-serif;font-size:12px;font-weight:700;color:var(--mint);background:rgba(121,198,184,.16);padding:5px 11px;border-radius:100px}

/* TOPIC */
.topic{padding:42px 0;border-bottom:1px solid var(--line)}
.topic:last-child{border-bottom:none}
.topic-head{display:flex;align-items:baseline;gap:14px;margin-bottom:18px}
.topic-idx{font-family:'Plus Jakarta Sans',system-ui,sans-serif;font-weight:700;font-size:24px;color:var(--sky-l)}
.topic-title{font-size:clamp(22px,4vw,31px);font-weight:700}
.lead{font-size:18px;color:var(--ink-soft);margin:0 0 22px;padding-left:16px;border-left:3px solid var(--glow)}
.concept{margin:24px 0;background:#fff;border:1px solid var(--line);border-radius:16px;padding:20px 22px;box-shadow:var(--sh-sm);border-left:4px solid var(--sky)}
.concept h4{font-size:18px;font-weight:800;margin:0 0 12px;color:var(--ink);display:flex;align-items:center;gap:9px}
.concept h4 .c-mark{flex-shrink:0;width:10px;height:10px;border-radius:3px;background:linear-gradient(135deg,var(--sky),var(--sky-d));transform:rotate(45deg)}
.concept-list{list-style:none;margin:0;padding:0}
.concept-list li{display:flex;align-items:flex-start;gap:11px;margin:10px 0;line-height:1.65}
.concept-list li .c-dot{flex-shrink:0;width:8px;height:8px;margin-top:8px;border-radius:50%;background:var(--sky);box-shadow:0 0 0 3px var(--mist)}
.concept-list li .c-txt{flex:1;color:var(--ink-soft);font-size:15px}
.concept-list li::before{content:none}

/* diagrams */
.dgm-fig{margin:26px 0;background:linear-gradient(180deg,var(--wash),#fff);border:1px solid var(--line);border-radius:18px;padding:22px 18px;text-align:center;box-shadow:var(--sh-sm);overflow:hidden}
.dgm-fig svg{width:100%;height:auto;display:block;margin:0 auto}
.dgm-fig figcaption{margin-top:14px;font-size:14px;color:var(--muted);font-style:italic}
.pos-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
.pos-card{background:#fff;border-radius:12px;overflow:hidden}
.pos-card svg{width:100%;height:auto;display:block}
@media(max-width:700px){.pos-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:430px){.pos-grid{grid-template-columns:1fr}}

/* tables */
.tbl-wrap{margin:26px 0;overflow-x:auto}
.tbl-cap{font-family:'Plus Jakarta Sans',system-ui,sans-serif;font-size:12px;letter-spacing:.14em;text-transform:uppercase;color:var(--muted);font-weight:700;margin-bottom:10px}
.tbl{width:100%;border-collapse:collapse;font-size:15px;background:#fff;border-radius:14px;overflow:hidden;box-shadow:var(--sh-sm);border:1px solid var(--line);min-width:420px}
.tbl thead th{background:var(--mist);color:var(--ink);font-family:'Plus Jakarta Sans',system-ui,sans-serif;font-weight:700;font-size:13px;text-align:left;padding:13px 15px;border-bottom:2px solid var(--sky-l)}
.tbl td{padding:12px 15px;border-top:1px solid var(--line);vertical-align:top}
.tbl tbody tr:nth-child(even){background:var(--wash)}

/* boxes */
.box{border-radius:16px;padding:18px 20px;border:1px solid var(--line);background:#fff;box-shadow:var(--sh-sm);margin:22px 0;position:relative;overflow:hidden}
.box::before{content:"";position:absolute;left:0;top:0;bottom:0;width:5px}
.box-label{font-family:'Plus Jakarta Sans',system-ui,sans-serif;font-weight:700;font-size:12px;letter-spacing:.1em;text-transform:uppercase;display:flex;align-items:center;gap:9px;margin-bottom:12px}
.box .ic{font-size:14px} .box ul{margin:0;padding-left:20px} .box li{margin:7px 0}
.b-kw::before{background:var(--sky-d)} .b-kw .box-label{color:var(--sky-d)} .b-kw{background:linear-gradient(180deg,#F1F7FD,#fff)}
.kw-wrap{display:flex;flex-wrap:wrap;gap:8px}
.kw{font-family:'Plus Jakarta Sans',system-ui,sans-serif;font-size:13.5px;font-weight:600;color:var(--sky-d);background:var(--mist);border:1px solid var(--sky-l);padding:6px 13px;border-radius:9px}
.b-trap::before{background:var(--coral)} .b-trap .box-label{color:#D2705A} .b-trap{background:linear-gradient(180deg,#FDF3F0,#fff)}

/* quiz */
.quiz{margin:44px 0 10px;padding:28px 26px;background:linear-gradient(180deg,var(--wash),#fff);border:1px solid var(--line);border-radius:20px;box-shadow:var(--sh)}
.quiz-head{text-align:center;margin-bottom:22px;padding-bottom:18px;border-bottom:1px solid var(--line)}
.quiz-kicker{font-family:'Plus Jakarta Sans',system-ui,sans-serif;font-size:12px;letter-spacing:.26em;text-transform:uppercase;color:var(--sky-d);font-weight:700}
.quiz-head h4{font-size:23px;font-weight:700;margin:6px 0 3px}
.quiz-sub{color:var(--muted);font-size:14px;margin:0}
.q{margin:20px 0;padding:20px;background:#fff;border:1px solid var(--line);border-radius:14px}
.q-num{font-family:'Plus Jakarta Sans',system-ui,sans-serif;font-size:11px;letter-spacing:.16em;text-transform:uppercase;color:var(--sky-d);font-weight:700;margin-bottom:8px}
.q-text{font-size:17.5px;font-weight:700;color:var(--ink);margin-bottom:15px;font-family:'Plus Jakarta Sans',system-ui,sans-serif;line-height:1.4}
.opts{display:flex;flex-direction:column;gap:9px}
.opt{display:flex;align-items:center;gap:12px;text-align:left;font:inherit;cursor:pointer;background:var(--wash);border:1.5px solid var(--line);border-radius:11px;padding:12px 14px;transition:.16s;color:var(--ink-soft);font-size:16px}
.opt:hover{border-color:var(--sky);background:#fff}
.opt-l{font-family:'Plus Jakarta Sans',system-ui,sans-serif;font-weight:700;font-size:13px;color:var(--sky-d);background:#fff;border:1.5px solid var(--line);width:29px;height:29px;border-radius:8px;display:flex;align-items:center;justify-content:center;flex-shrink:0}
.opt.correct{border-color:var(--mint);background:#EEFAF7} .opt.correct .opt-l{background:var(--mint);color:#fff;border-color:var(--mint)}
.opt.wrong{border-color:var(--coral);background:#FDF1EE} .opt.wrong .opt-l{background:var(--coral);color:#fff;border-color:var(--coral)}
.opt.lock{pointer-events:none;opacity:.65} .opt.lock.correct,.opt.lock.wrong{opacity:1}
.rationale{display:none;margin-top:13px;padding:14px 16px;background:#EEFAF7;border-left:3px solid var(--mint);border-radius:9px;font-size:15.5px;color:var(--ink-soft)}
.rationale.show{display:block}
.rat-l{display:block;font-family:'Plus Jakarta Sans',system-ui,sans-serif;font-size:11px;letter-spacing:.12em;text-transform:uppercase;color:#3E9E8E;font-weight:700;margin-bottom:5px}

/* normal vs abnormal comparison */
.na-wrap{margin:26px 0;overflow-x:auto}
.na-cap{font-family:'Plus Jakarta Sans',system-ui,sans-serif;font-size:12px;letter-spacing:.12em;text-transform:uppercase;color:var(--muted);font-weight:700;margin-bottom:10px}
.na-tbl{width:100%;border-collapse:collapse;font-size:14.5px;background:#fff;border-radius:14px;overflow:hidden;box-shadow:var(--sh-sm);border:1px solid var(--line);min-width:520px}
.na-tbl th{font-family:'Plus Jakarta Sans',system-ui,sans-serif;font-weight:700;font-size:12.5px;text-align:left;padding:12px 14px}
.na-tbl thead th:first-child{background:var(--mist);color:var(--ink)}
.na-h-norm{background:#EAF7F2;color:#3E9E8E}
.na-h-abn{background:#FDEEE9;color:#D2705A}
.na-tbl td{padding:11px 14px;border-top:1px solid var(--line);vertical-align:top}
.na-sys{font-family:'Plus Jakarta Sans',system-ui,sans-serif;font-weight:700;color:var(--ink);font-size:13.5px;background:var(--wash)}
.na-norm{color:#3E7F74;background:#F4FBF9}
.na-abn{color:#C05B44;background:#FEF6F3}

/* section end marker */
.sec-end{text-align:center;padding:40px 0 10px}
.sec-end-mk{width:44px;height:47px;margin:0 auto 10px;opacity:.9}
.sec-end-t{font-family:'Plus Jakarta Sans',system-ui,sans-serif;font-weight:700;font-size:18px;color:var(--sky-d)}
.sec-end-s{font-family:'Plus Jakarta Sans',system-ui,sans-serif;font-size:13px;color:var(--muted);margin-top:2px}

/* footer */
.foot{background:var(--mist);color:var(--ink-soft);padding:50px 0;text-align:center;border-top:1px solid var(--line)}
.foot .mk{width:50px;height:54px;margin:0 auto 12px}
.foot .bn{font-family:'Plus Jakarta Sans',system-ui,sans-serif;color:var(--ink);font-size:21px;letter-spacing:.07em;margin-bottom:8px}
.foot p{font-family:'Plus Jakarta Sans',system-ui,sans-serif;font-size:13px;color:var(--muted);max-width:56ch;margin:6px auto}

@media(max-width:640px){
  body{font-size:16px} .wrap{padding:0 14px}
  .toc-q{display:none} .quiz{padding:16px 13px} .q{padding:14px}
  .cover-mark{width:110px;height:118px} .motiv-card{padding:30px 18px}
  .ct-head{padding:13px 14px;gap:8px} .ct-sn{font-size:20px;min-width:28px}
  /* Top bar: icons stay visible, Library keeps its label */
  .topbar-in{padding:0 8px;gap:6px;flex-wrap:nowrap}
  .tb-btn{padding:8px;font-size:13px;white-space:nowrap;flex:none;min-width:38px;justify-content:center;display:inline-flex;align-items:center;gap:5px}
  .tb-btn svg{width:19px;height:19px;flex:none}
  .tb-btn span.lbl{display:none}
  .tb-btn[href*="library"] span.lbl{display:inline;font-size:13px}  /* keep المكتبة visible */
  .tb-mk img{width:28px !important;height:28px !important}
  .topbar .tb-name{display:none}
  .tb-spacer{flex:1}
  .tb-pct{font-size:12px;min-width:34px;text-align:center}
  /* Topic headings must never be clipped */
  .topic-title{font-size:20px;line-height:1.4;word-break:break-word}
  .topic-head{flex-wrap:wrap;gap:6px}
  .sec-title{font-size:24px;word-break:break-word}
  .cover h1,.cover-inner h1{font-size:30px;line-height:1.25;word-break:break-word}
  /* Section/topic cards full width, comfortable padding */
  .section-block,.contents{padding:24px 0}
  .topic{margin-bottom:20px}
  table{font-size:13px}
  th,td{padding:8px 6px}
  /* Contents list cards */
  .ct-title{font-size:15px;line-height:1.5}
  .ct-topics-count{font-size:11px}
}
@media(max-width:400px){
  .topic-title{font-size:18px}
  .tb-btn{padding:6px 8px;font-size:12px}
}
@media(prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}}

/* ===== STEPS block (numbered process cards) ===== */
.steps-block{margin:26px 0}
.steps-h{font-family:'Plus Jakarta Sans','IBM Plex Sans Arabic',system-ui,sans-serif;font-size:20px;color:var(--ink);margin:0 0 16px;text-align:center}
.steps-grid{display:flex;flex-direction:column;gap:12px}
.step-card{display:flex;gap:16px;align-items:flex-start;background:linear-gradient(135deg,var(--mist),#fff);border:1px solid var(--line);border-radius:16px;padding:18px 20px;box-shadow:var(--sh-sm);transition:.2s}
.step-card:hover{transform:translateX(-3px);border-color:var(--sky-l)}
.step-n{flex-shrink:0;width:44px;height:44px;border-radius:12px;background:linear-gradient(135deg,var(--sky),var(--sky-d));color:#fff;font-family:'Plus Jakarta Sans',system-ui,sans-serif,serif;font-size:22px;font-weight:700;display:flex;align-items:center;justify-content:center;box-shadow:0 6px 16px -8px var(--sky-d)}
.step-body{flex:1}
.step-body h5{font-size:16px;font-weight:700;color:var(--ink);margin:2px 0 8px}
.step-body ul{margin:0;padding-inline-start:18px}
.step-body li{font-size:14.5px;color:var(--ink-soft);margin-bottom:5px;line-height:1.6}
.step-mnemonic{margin-top:18px;background:linear-gradient(135deg,#FFF6E6,#fff);border:1px solid var(--glow);border-radius:14px;padding:16px 20px;text-align:center}
.mn-tag{display:block;font-family:'Plus Jakarta Sans',system-ui,sans-serif,sans-serif;font-size:12px;font-weight:700;color:var(--gold-d,#C79A3D);letter-spacing:.06em;margin-bottom:6px}
.mn-main{display:block;font-family:'Plus Jakarta Sans',system-ui,sans-serif,serif;font-size:24px;font-weight:700;color:var(--ink);letter-spacing:.08em}
.mn-note{display:block;font-size:13px;color:var(--muted);margin-top:4px;font-style:italic}
/* ===== IMPORTANT callout ===== */
.b-important::before{background:var(--glow,#F0C070)} .b-important .box-label{color:#B5852B} .b-important{background:linear-gradient(180deg,#FFF8EC,#fff)}
.b-important .box-label .ic{color:var(--glow,#F0C070)}
.b-important ul{margin:0;padding-inline-start:20px} .b-important li{font-size:14.5px;color:var(--ink-soft);margin-bottom:6px;line-height:1.65}

/* ===== Positions Gallery (professional cards) ===== */
.pos-gallery{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:18px;margin:24px 0}
.posc{background:#fff;border:1px solid var(--line);border-radius:18px;padding:16px;box-shadow:var(--sh-sm);transition:.2s;display:flex;flex-direction:column}
.posc:hover{transform:translateY(-4px);box-shadow:var(--sh);border-color:var(--sky-l)}
.posc-head{display:flex;align-items:center;gap:10px;margin-bottom:10px}
.posc-n{flex-shrink:0;width:30px;height:30px;border-radius:9px;background:linear-gradient(135deg,var(--sky),var(--sky-d));color:#fff;font-family:'Plus Jakarta Sans',system-ui,sans-serif,serif;font-weight:700;font-size:15px;display:flex;align-items:center;justify-content:center}
.posc-head h5{font-size:15.5px;font-weight:800;color:var(--ink);margin:0;line-height:1.3}
.posc-img{background:linear-gradient(160deg,var(--mist),#fff);border-radius:12px;padding:8px;margin-bottom:12px}
.posc-lbl{display:block;font-family:'Plus Jakarta Sans',system-ui,sans-serif,sans-serif;font-size:11.5px;font-weight:700;letter-spacing:.03em;margin-bottom:6px}
.posc-uses{margin-bottom:10px}
.posc-uses .posc-lbl{color:var(--sky-d)}
.posc-uses ul{margin:0;padding-inline-start:18px}
.posc-uses li{font-size:13px;color:var(--ink-soft);margin-bottom:3px;line-height:1.5}
.posc-exp{margin-top:auto;padding-top:10px;border-top:1px dashed var(--line)}
.posc-exp .posc-lbl{color:var(--coral)}
.posc-exp p{font-size:12.5px;color:var(--muted);margin:0;line-height:1.55}

/* ===== Real photographic images ===== */
.real-fig{margin:24px 0;text-align:center;background:linear-gradient(160deg,var(--mist),#fff);border:1px solid var(--line);border-radius:18px;padding:18px;box-shadow:var(--sh-sm)}
.real-fig img{max-width:100%;max-height:420px;width:auto;height:auto;border-radius:12px;background:#fff}
.real-fig.tall img{max-height:520px}
.real-fig figcaption{margin-top:14px;font-size:13.5px;color:var(--muted);font-style:italic;font-family:'IBM Plex Sans Arabic',Georgia,serif;line-height:1.6}
@media(max-width:640px){.real-fig{padding:12px}.real-fig img{max-height:300px}.real-fig.tall img{max-height:380px}}
/* Image grid (e.g. PPE) */
.image-grid-block{margin:26px 0}
.ig-h{font-family:'Plus Jakarta Sans','IBM Plex Sans Arabic',system-ui,sans-serif;font-size:20px;color:var(--ink);text-align:center;margin:0 0 18px}
.image-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:16px}
.ig-card{background:#fff;border:1px solid var(--line);border-radius:16px;overflow:hidden;box-shadow:var(--sh-sm);transition:.2s;display:flex;flex-direction:column}
.ig-card:hover{transform:translateY(-4px);box-shadow:var(--sh);border-color:var(--sky-l)}
.ig-img{background:linear-gradient(160deg,var(--mist),#fff);padding:16px;display:flex;align-items:center;justify-content:center;min-height:150px}
.ig-img img{max-width:100%;max-height:160px;height:auto;object-fit:contain;mix-blend-mode:multiply}
.ig-cap{padding:14px 16px;text-align:center;border-top:1px solid var(--line)}
.ig-title{display:block;font-size:15px;font-weight:800;color:var(--ink)}
.ig-sub{display:block;font-size:12.5px;color:var(--muted);margin-top:3px}

/* ===== Quiz start button (click to reveal questions) ===== */
.quiz-block{margin:28px 0}
.quiz-start{width:100%;display:flex;align-items:center;gap:16px;background:linear-gradient(135deg,var(--sky-d),var(--ink));color:#fff;border:none;border-radius:18px;padding:20px 24px;cursor:pointer;text-align:right;transition:.25s;box-shadow:0 12px 30px -14px rgba(47,74,114,.5);font-family:inherit}
.quiz-start:hover{transform:translateY(-3px);box-shadow:0 18px 40px -16px rgba(47,74,114,.6)}
.quiz-start.active{border-radius:18px 18px 0 0}
.qs-icon{flex-shrink:0;width:52px;height:52px;border-radius:14px;background:rgba(255,255,255,.16);display:flex;align-items:center;justify-content:center;color:#fff}
.qs-text{flex:1;display:flex;flex-direction:column;text-align:left}
.qs-title{font-size:19px;font-weight:800;color:#fff}
.qs-sub{font-size:13px;color:#D6E4F5;margin-top:3px}
.qs-arrow{font-size:20px;color:var(--glow,#F0C070);transition:.25s}
.quiz-start.active .qs-arrow{transform:rotate(90deg)}
.quiz-block .quiz{border:2px solid var(--sky-d);border-top:none;border-radius:0 0 18px 18px;padding:20px;background:var(--wash)}

/* Alternating concept accent colors for visual rhythm */
.chapter .concept:nth-of-type(3n+1){border-left-color:var(--sky)}
.chapter .concept:nth-of-type(3n+2){border-left-color:var(--mint)}
.chapter .concept:nth-of-type(3n+2) h4 .c-mark{background:linear-gradient(135deg,var(--mint),var(--mint-d))}
.chapter .concept:nth-of-type(3n+2) .concept-list li .c-dot{background:var(--mint)}
.chapter .concept:nth-of-type(3n) {border-left-color:var(--coral)}
.chapter .concept:nth-of-type(3n) h4 .c-mark{background:linear-gradient(135deg,var(--coral),#D2705A)}
.chapter .concept:nth-of-type(3n) .concept-list li .c-dot{background:var(--coral)}

/* ===== Image Table (compact PPE layout) ===== */
.image-table-block{margin:26px 0}
.image-table{display:grid;grid-template-columns:repeat(2,1fr);gap:12px;background:#fff;border:1px solid var(--line);border-radius:16px;padding:14px;box-shadow:var(--sh-sm)}
.it-row{display:flex;align-items:center;gap:14px;padding:10px 12px;border-radius:12px;background:linear-gradient(160deg,var(--mist),#fff);border:1px solid var(--line)}
.it-thumb{flex-shrink:0;width:64px;height:64px;border-radius:10px;background:#fff;border:1px solid var(--line);display:flex;align-items:center;justify-content:center;padding:6px}
.it-thumb img{max-width:100%;max-height:52px;width:auto;height:auto;object-fit:contain;mix-blend-mode:multiply}
.it-info{flex:1;min-width:0}
.it-title{display:block;font-size:14.5px;font-weight:800;color:var(--ink)}
.it-sub{display:block;font-size:12px;color:var(--muted);margin-top:2px;line-height:1.4}
@media(max-width:600px){.image-table{grid-template-columns:1fr}.it-thumb{width:54px;height:54px}.it-thumb img{max-height:44px}}

/* Organ anatomy images (AI-generated reference set) */
.real-fig.organ{background:#fff;padding:14px}
.real-fig.organ img{max-height:480px;border-radius:10px}
@media(max-width:640px){.real-fig.organ img{max-height:340px}}

/* ===== Annotation toolbar + notes (pen / highlighter / notes) ===== */
#nh-annot-bar{position:fixed;right:16px;bottom:20px;z-index:60;display:flex;align-items:center;gap:4px;background:#fff;border:1px solid var(--line);border-radius:16px;padding:7px 9px;box-shadow:0 10px 30px -8px rgba(47,74,114,.4)}
#nh-annot-bar button{width:40px;height:40px;border:none;background:transparent;border-radius:11px;font-size:18px;cursor:pointer;transition:.15s;position:relative;display:flex;align-items:center;justify-content:center}
#nh-annot-bar button:hover{background:var(--mist)}
#nh-annot-bar button.on{background:var(--sky);box-shadow:inset 0 0 0 2px var(--sky-d)}
#nh-annot-bar button.off{opacity:.4}
#nh-annot-bar .nh-sep{width:1px;height:26px;background:var(--line);margin:0 2px}
#nh-annot-bar [data-a="note"][data-count]:not([data-count=""]):after{content:attr(data-count);position:absolute;top:-2px;right:-2px;background:var(--coral);color:#fff;font-size:10px;font-weight:700;min-width:16px;height:16px;border-radius:9px;display:flex;align-items:center;justify-content:center;padding:0 3px}
@media(max-width:640px){#nh-annot-bar{right:10px;bottom:12px;gap:2px;padding:5px 6px}#nh-annot-bar button{width:36px;height:36px;font-size:16px}}

#nh-notes-panel{position:fixed;top:0;right:-380px;width:360px;max-width:88vw;height:100vh;background:#fff;border-left:1px solid var(--line);box-shadow:-12px 0 40px -14px rgba(47,74,114,.35);z-index:70;transition:right .28s cubic-bezier(.4,0,.2,1);display:flex;flex-direction:column}
#nh-notes-panel.open{right:0}
.nh-np-head{display:flex;align-items:center;gap:12px;padding:18px 20px;border-bottom:1px solid var(--line)}
.nh-np-head b{font-family:'Plus Jakarta Sans','IBM Plex Sans Arabic',system-ui,sans-serif;font-size:17px;color:var(--ink);flex:1}
.nh-np-toggle{font-size:13px;color:var(--muted);display:flex;align-items:center;gap:5px;cursor:pointer}
#nh-np-close{border:none;background:var(--mist);width:32px;height:32px;border-radius:9px;cursor:pointer;font-size:15px;color:var(--ink)}
.nh-np-add{padding:16px 20px;border-bottom:1px solid var(--line)}
.nh-np-add textarea{width:100%;box-sizing:border-box;border:1px solid var(--line);border-radius:12px;padding:11px;font-family:inherit;font-size:14px;resize:vertical;color:var(--ink)}
.nh-np-add textarea:focus{outline:none;border-color:var(--sky)}
#nh-np-save{margin-top:10px;width:100%;background:linear-gradient(135deg,var(--sky-d),var(--ink));color:#fff;border:none;border-radius:11px;padding:11px;font-weight:700;font-size:14px;cursor:pointer;font-family:inherit}
.nh-np-list{flex:1;overflow-y:auto;padding:16px 20px}
.nh-np-empty{color:var(--muted);font-size:14px;text-align:center;padding:24px 0;font-style:italic}
.nh-note{background:linear-gradient(160deg,#FFF9E9,#fff);border:1px solid #F0DFA8;border-radius:12px;padding:12px 14px;margin-bottom:12px}
.nh-note-pg{font-size:12px;font-weight:700;color:var(--sky-d);cursor:pointer;margin-bottom:5px}
.nh-note-pg:hover{text-decoration:underline}
.nh-note-tx{font-size:14px;color:var(--ink);line-height:1.55;white-space:pre-wrap}
.nh-note-del{margin-top:8px;border:none;background:transparent;color:var(--coral);font-size:12px;cursor:pointer;padding:0;font-family:inherit}
.nh-note-del:hover{text-decoration:underline}

/* ===== In-book search ===== */
#nh-search{position:fixed;top:70px;right:16px;z-index:65}
#nh-search-open{width:44px;height:44px;border:1px solid var(--line);background:#fff;border-radius:13px;font-size:18px;cursor:pointer;box-shadow:0 8px 24px -8px rgba(47,74,114,.35);transition:.15s}
#nh-search-open:hover{background:var(--mist)}
#nh-search.open #nh-search-open{background:var(--sky);border-color:var(--sky-d)}
#nh-search-panel{display:none;position:absolute;top:0;right:0;align-items:center;gap:4px;background:#fff;border:1px solid var(--line);border-radius:13px;padding:6px 8px;box-shadow:0 12px 32px -10px rgba(47,74,114,.4)}
#nh-search.open #nh-search-panel{display:flex}
#nh-search-input{border:none;outline:none;font-family:inherit;font-size:14px;padding:6px 8px;width:190px;color:var(--ink)}
#nh-search-count{font-family:'Plus Jakarta Sans',system-ui,sans-serif,sans-serif;font-size:12px;font-weight:600;color:var(--muted);min-width:38px;text-align:center}
#nh-search-panel button{border:none;background:var(--mist);width:30px;height:30px;border-radius:8px;cursor:pointer;font-size:14px;color:var(--ink);transition:.12s}
#nh-search-panel button:hover{background:var(--sky-l)}
.nh-hit{background:rgba(245,213,71,.4);border-radius:3px;box-shadow:0 0 0 2px rgba(245,213,71,.3)}
.nh-hit-active{background:rgba(232,150,84,.5);box-shadow:0 0 0 3px rgba(232,150,84,.45)}
@media(max-width:640px){#nh-search{top:64px;right:10px}#nh-search-input{width:130px}}

/* ===== Creative content polish (less book-like, more engaging) ===== */
/* Concept cards: subtle lift on hover + gradient wash + rotating accent dot colors */
.concept{transition:transform .18s cubic-bezier(.4,0,.2,1),box-shadow .18s,border-color .18s;position:relative;overflow:hidden}
.concept:hover{transform:translateY(-2px);box-shadow:0 14px 30px -14px rgba(47,74,114,.28)}
.concept::after{content:"";position:absolute;top:0;right:0;width:70px;height:70px;background:radial-gradient(circle at top right,rgba(74,130,196,.08),transparent 70%);pointer-events:none}
.chapter .concept:nth-of-type(3n+2)::after{background:radial-gradient(circle at top right,rgba(74,168,124,.09),transparent 70%)}
.chapter .concept:nth-of-type(3n)::after{background:radial-gradient(circle at top right,rgba(216,120,90,.09),transparent 70%)}
.chapter .concept:nth-of-type(3n+2) .c-dot{background:var(--mint);box-shadow:0 0 0 3px rgba(74,168,124,.12)}
.chapter .concept:nth-of-type(3n) .c-dot{background:var(--coral);box-shadow:0 0 0 3px rgba(216,120,90,.12)}
.chapter .concept:nth-of-type(3n+2) h4 .c-mark{background:linear-gradient(135deg,var(--mint),#2E8B5C)}
.chapter .concept:nth-of-type(3n) h4 .c-mark{background:linear-gradient(135deg,var(--coral),#C05A3E)}

/* Important callout: gentle glow + left accent bar animation */
.b-important{position:relative;transition:transform .18s,box-shadow .18s}
.b-important:hover{transform:translateY(-2px);box-shadow:0 14px 30px -14px rgba(240,192,112,.4)}
.b-important .box-label .ic{animation:nh-star 3s ease-in-out infinite;display:inline-block}
@keyframes nh-star{0%,100%{transform:scale(1) rotate(0)}50%{transform:scale(1.15) rotate(8deg)}}

/* Step cards: number badge gradient + connecting line feel */
.step-num{background:linear-gradient(135deg,var(--sky),var(--sky-d))!important;color:#fff;box-shadow:0 4px 10px -3px rgba(74,130,196,.5)}
.steps-block .step-card:nth-child(3n+2) .step-num{background:linear-gradient(135deg,var(--mint),#2E8B5C)!important}
.steps-block .step-card:nth-child(3n) .step-num{background:linear-gradient(135deg,var(--coral),#C05A3E)!important}

/* Tables: zebra rows + header gradient + hover row highlight */
.na-tbl tbody tr:nth-child(even),.dtable tbody tr:nth-child(even){background:rgba(74,130,196,.03)}
.na-tbl tbody tr:hover,.dtable tbody tr:hover{background:var(--mist)}
.dtable thead th,.na-tbl thead th{background:linear-gradient(135deg,var(--sky-l),var(--mist))}

/* Section entrance: soft fade for topic titles */
.topic-title{position:relative}
.topic-title::before{content:"";position:absolute;left:-14px;top:50%;transform:translateY(-50%);width:5px;height:0;background:linear-gradient(180deg,var(--sky),var(--mint));border-radius:3px;transition:height .3s}
.topic:hover .topic-title::before{height:70%}

/* Lead paragraph: elegant drop accent */
.lead{position:relative;font-size:17px;line-height:1.7}

/* ===== Custom SVG icons in reader tools (cohesive design) ===== */
#nh-annot-bar button svg{width:21px;height:21px;color:var(--ink-soft);transition:color .15s}
#nh-annot-bar button:hover svg{color:var(--ink)}
#nh-annot-bar button.on svg{color:var(--sky-d)}
#nh-annot-bar button.off svg{opacity:.5}
#nh-search-open svg{width:20px;height:20px;color:var(--ink-soft)}
#nh-search.open #nh-search-open svg{color:var(--sky-d)}
#nh-search-panel button svg{width:16px;height:16px;color:var(--ink-soft)}
#nh-search-panel button:hover svg{color:var(--sky-d)}

/* ===== Major book-divider pages (Maternity & Gyn / Pediatrics) ===== */
.book-divider{background:linear-gradient(150deg,var(--ink) 0%,var(--sky-d) 55%,#7A4A88 100%);color:#fff;padding:110px 24px;text-align:center;position:relative;overflow:hidden}
.book-divider::before{content:"";position:absolute;inset:0;background:radial-gradient(circle at 30% 30%,rgba(255,255,255,.14),transparent 55%);pointer-events:none}
.bd-inner{position:relative;z-index:1;max-width:600px;margin:0 auto}
.bd-mk{width:74px;height:74px;margin:0 auto 26px;background:rgba(255,255,255,.16);border-radius:22px;display:flex;align-items:center;justify-content:center;backdrop-filter:blur(4px)}
.bd-mk svg{width:46px;height:46px}
.bd-mk svg *{fill:#fff !important;stroke:#fff !important}
.bd-kick{font-size:14px;font-weight:700;letter-spacing:3px;text-transform:uppercase;opacity:.85;margin-bottom:14px}
.bd-title{font-family:'Plus Jakarta Sans','IBM Plex Sans Arabic',system-ui,sans-serif;font-size:clamp(34px,6vw,52px);font-weight:700;line-height:1.1;margin-bottom:16px;color:#fff}
.bd-ar{font-size:clamp(22px,4vw,30px);font-weight:700;margin-bottom:22px;color:#EAF2FB}
.bd-sub{font-size:16px;line-height:1.7;opacity:.9;max-width:44ch;margin:0 auto}

/* ===== Bilingual important-box points (clean EN/AR separation) ===== */
.box ul.bil li{list-style:none;margin:0 0 14px;padding:0 0 14px 0;border-bottom:1px solid rgba(0,0,0,.06)}
.box ul.bil li:last-child{border-bottom:none;margin-bottom:0;padding-bottom:0}
.box ul.bil{padding-left:0}
.pt-en{display:block;direction:ltr;text-align:left;font-weight:600;color:var(--ink);line-height:1.5;margin-bottom:4px}
.pt-ar{display:block;direction:rtl;text-align:right;color:var(--muted,#6E6A8C);font-size:.94em;line-height:1.7}

/* ===== Bilingual lead (separated EN/AR) ===== */
.lead-en{display:block;direction:ltr;text-align:left;margin-bottom:8px}
.lead-ar{display:block;direction:rtl;text-align:right;font-size:.92em;color:var(--muted,#6E6A8C);line-height:1.8;padding-top:8px;border-top:1px solid rgba(0,0,0,.06)}

/* ===== Skip to Test Bank button (hero) ===== */
.skip-tb{display:inline-flex;align-items:center;gap:9px;margin-top:18px;padding:12px 24px;border-radius:100px;background:rgba(255,255,255,.16);border:1.5px solid rgba(255,255,255,.5);color:#fff;font-weight:700;font-size:14px;text-decoration:none;backdrop-filter:blur(4px);transition:.2s;cursor:pointer}
.skip-tb:hover{background:rgba(255,255,255,.28);transform:translateY(-2px)}
.skip-tb svg{flex:none}

/* ===== Test Bank section ===== */
.test-bank{background:linear-gradient(180deg,var(--paper,#FBF9FC),#fff);padding:60px 0 80px;border-top:3px solid var(--mist,#EFE7F2)}
.tb-head{text-align:center;max-width:640px;margin:0 auto 36px}
.tb-k{font-size:13px;font-weight:700;letter-spacing:.12em;text-transform:uppercase;color:var(--sky-d,#4A82C4)}
.tb-title{font-size:34px;margin:8px 0;color:var(--ink,#2E2A5E);font-family:'Plus Jakarta Sans','IBM Plex Sans Arabic',system-ui,sans-serif}
.tb-sub{color:var(--muted,#6E6A8C);font-size:15px;line-height:1.7}
.tb-controls{display:flex;gap:12px;justify-content:center;flex-wrap:wrap;margin-top:20px;align-items:center}
.tb-btn{padding:10px 22px;border-radius:100px;border:1.5px solid var(--sky,#4A82C4);background:#fff;color:var(--sky-d,#4A82C4);font-weight:700;font-size:13px;cursor:pointer;transition:.2s}
.tb-btn:hover{background:var(--sky-d,#4A82C4);color:#fff}
.tb-quiz{max-width:760px;margin:0 auto;padding:0 20px}
.tb-sec-label{font-size:15px;font-weight:800;color:var(--plum,#7A3E8F);text-transform:uppercase;letter-spacing:.06em;margin:34px 0 14px;padding-bottom:8px;border-bottom:2px solid var(--mist,#EFE7F2)}
.tb-quiz .q{margin-bottom:22px}

/* ===== Compact / collapsible master TOC ===== */
.ct-sec.compact .ct-list{display:none}
.ct-sec.compact.open .ct-list{display:block}
.ct-head{cursor:pointer}
.ct-toggle-ic{margin-left:auto;font-size:16px;transition:transform .2s;color:var(--muted,#6E6A8C)}
.ct-sec.open .ct-toggle-ic{transform:rotate(90deg)}
.ct-topics-count{display:block;font-size:12px;color:var(--muted,#6E6A8C);font-weight:500;margin-top:2px}

/* ===== Defensive fixes: guarantee lesson content is never hidden ===== */
/* The annotation canvas must sit BEHIND content, never over it */
#nh-annot-canvas{z-index:1 !important;pointer-events:none !important;background:transparent !important}
/* Content containers always above the canvas and always visible */
.section-block,.contents,.motiv-page,.test-bank,.topic,.topic-body,.chapter{position:relative;z-index:2}
.section-block,.topic,.topic-body,.concept,.box,.lead,.tbl,.na-tbl,.quiz{opacity:1 !important;visibility:visible !important}
/* Cover should introduce, not trap the reader on a full blank screen */
.cover{min-height:auto;padding:70px 20px 60px}

/* ===== Reader dark mode (comprehensive) ===== */
body.nh-dark-reader{--paper:#111A2B;--bg:#0B1120;--ink:#F1F5F9;--ink-soft:#CBD5E1;--muted:#94A3B8;--line:#1E293B;--mist:#1E293B;--wash:#0F172A}
body.nh-dark-reader{background:#0B1120;color:var(--ink-soft)}
/* Surfaces */
body.nh-dark-reader .section-block,body.nh-dark-reader .contents,body.nh-dark-reader .motiv-page,body.nh-dark-reader .cover,body.nh-dark-reader .test-bank,body.nh-dark-reader footer{background:#0F172A !important}
body.nh-dark-reader .box,body.nh-dark-reader .concept,body.nh-dark-reader .tbl,body.nh-dark-reader .tbl-wrap,body.nh-dark-reader .na-tbl,body.nh-dark-reader .quiz,body.nh-dark-reader .quiz-block,body.nh-dark-reader .motiv-card,body.nh-dark-reader .lead,body.nh-dark-reader .step-card,body.nh-dark-reader .kw-wrap,body.nh-dark-reader .ig-card,body.nh-dark-reader .image-table,body.nh-dark-reader .q,body.nh-dark-reader .qbox{background:#111A2B !important;border-color:#1E293B !important}
/* TOC white-gradient cards */
body.nh-dark-reader .ct-sec,body.nh-dark-reader .ct-head,body.nh-dark-reader [style*="linear-gradient"],body.nh-dark-reader [style*="background:#fff"],body.nh-dark-reader [style*="background:#FFF"],body.nh-dark-reader [style*="background:white"]{background:#111A2B !important}
/* Text: force legible light colors on ALL text elements */
body.nh-dark-reader,body.nh-dark-reader p,body.nh-dark-reader li,body.nh-dark-reader span,body.nh-dark-reader div,body.nh-dark-reader td,body.nh-dark-reader .lead-en,body.nh-dark-reader .lead-ar,body.nh-dark-reader .pt-en,body.nh-dark-reader .pt-ar,body.nh-dark-reader .c-txt,body.nh-dark-reader .kw,body.nh-dark-reader .mn-main,body.nh-dark-reader .mn-note,body.nh-dark-reader .step-body,body.nh-dark-reader .na-abn,body.nh-dark-reader .rationale,body.nh-dark-reader .q-text,body.nh-dark-reader .opt-t,body.nh-dark-reader .qs-text{color:var(--ink-soft) !important}
body.nh-dark-reader h1,body.nh-dark-reader h2,body.nh-dark-reader h3,body.nh-dark-reader h4,body.nh-dark-reader b,body.nh-dark-reader strong,body.nh-dark-reader .topic-title,body.nh-dark-reader .sec-title,body.nh-dark-reader .box-label,body.nh-dark-reader .tbl-cap,body.nh-dark-reader .qs-title,body.nh-dark-reader .steps-h,body.nh-dark-reader .ig-title{color:var(--ink) !important}
body.nh-dark-reader .topic-idx,body.nh-dark-reader .ct-sn,body.nh-dark-reader .c-dot,body.nh-dark-reader .mn-tag,body.nh-dark-reader .kw::before{color:var(--sky) !important}
/* Tables */
body.nh-dark-reader th{background:#1E293B !important;color:var(--ink) !important;border-color:#1E293B !important}
body.nh-dark-reader td{border-color:#1E293B !important}
body.nh-dark-reader tr:nth-child(even) td{background:#18222F !important}
/* Quiz options */
body.nh-dark-reader .opt{background:#111A2B !important;border-color:#1E293B !important;color:var(--ink-soft) !important}
body.nh-dark-reader .opt:hover{background:#1E293B !important}
body.nh-dark-reader .opt.correct{background:#12352B !important;border-color:#2E8B6F !important;color:#8FE0C4 !important}
body.nh-dark-reader .opt.wrong{background:#3A1E1A !important;border-color:#C0603F !important;color:#F0B0A0 !important}
body.nh-dark-reader .rationale{background:#152232 !important;border-color:#1E293B !important}
body.nh-dark-reader .quiz-start{background:#1E293B !important;color:var(--ink) !important}
/* Top bar */
body.nh-dark-reader .topbar{background:rgba(11,17,32,.96) !important;border-color:#2C3C52}
body.nh-dark-reader .topbar *{color:var(--ink-soft) !important}
body.nh-dark-reader .tb-btn{background:#111A2B !important;border-color:#1E293B !important}
/* Forms / inputs */
body.nh-dark-reader input,body.nh-dark-reader textarea,body.nh-dark-reader select{background:#111A2B !important;color:var(--ink) !important;border-color:#1E293B !important}
body.nh-dark-reader input::placeholder,body.nh-dark-reader textarea::placeholder{color:var(--muted) !important}
/* Annotation toolbar + notes panel */
body.nh-dark-reader #nh-annot-bar{background:#111A2B !important;border-color:#1E293B !important}
body.nh-dark-reader #nh-annot-bar button svg{color:var(--ink-soft) !important}
body.nh-dark-reader #nh-notes-panel{background:#161E2B !important;color:var(--ink-soft) !important;border-color:#1E293B !important}
body.nh-dark-reader #nh-notes-panel .nh-note{background:#111A2B !important;border-color:#1E293B !important}
body.nh-dark-reader .toast{background:#1E293B !important;color:var(--ink) !important}

/* ===================== Reading Tools v3 (modern) ===================== */
:root{--nh-fs:17px}
.topic-body,.topic-body p,.topic-body li{font-size:var(--nh-fs)}
.nh-hl{border-radius:4px;padding:1px 0;cursor:pointer;box-decoration-break:clone;-webkit-box-decoration-break:clone;transition:filter .15s}
.nh-hl:hover{filter:brightness(.94)}

/* Floating selection menu */
.nh-sel-menu{position:absolute;z-index:80;display:none;align-items:center;gap:6px;
  background:#0F172A;border-radius:14px;padding:8px 10px;box-shadow:0 16px 40px -12px rgba(2,6,23,.55);
  animation:nhPop .16s ease-out}
.nh-sel-menu.show{display:flex}
@keyframes nhPop{from{opacity:0;transform:translateY(6px) scale(.96)}to{opacity:1;transform:none}}
.nh-sel-menu button{width:30px;height:30px;border:none;border-radius:9px;cursor:pointer;font-size:15px;
  color:#E2E8F0;background:transparent;display:flex;align-items:center;justify-content:center;transition:.15s}
.nh-sel-menu button[data-c]{box-shadow:0 0 0 2px rgba(255,255,255,.15) inset}
.nh-sel-menu button:hover{transform:scale(1.08)}
.nh-sel-menu .nh-sm-sep{width:1px;height:22px;background:rgba(255,255,255,.18);margin:0 2px}

/* Floating reading toolbar */
#nh-read-bar{position:fixed;bottom:18px;left:50%;transform:translateX(-50%);z-index:70;
  display:flex;align-items:center;gap:3px;background:rgba(255,255,255,.86);backdrop-filter:blur(14px);
  border:1px solid var(--line);border-radius:100px;padding:6px 8px;box-shadow:0 14px 40px -14px rgba(15,23,42,.35)}
#nh-read-bar button{min-width:40px;height:40px;border:none;background:transparent;border-radius:100px;
  cursor:pointer;font-size:14px;font-weight:700;color:var(--ink-soft);display:flex;align-items:center;justify-content:center;transition:.15s}
#nh-read-bar button:hover{background:var(--mist);color:var(--ink)}
#nh-read-bar button.off{opacity:.4}
#nh-read-bar button svg{width:20px;height:20px}
#nh-read-bar .nh-sep{width:1px;height:22px;background:var(--line);margin:0 4px}

/* Notes panel */
#nh-notes-panel{position:fixed;top:0;left:0;height:100%;width:340px;max-width:88vw;background:var(--paper);
  border-inline-end:1px solid var(--line);box-shadow:14px 0 44px -18px rgba(15,23,42,.35);z-index:90;
  transform:translateX(-105%);transition:transform .28s cubic-bezier(.3,.8,.3,1);display:flex;flex-direction:column}
#nh-notes-panel.open{transform:none}
.nh-np-head{display:flex;align-items:center;padding:16px 18px;border-bottom:1px solid var(--line)}
.nh-np-head b{flex:1;font-size:16px;color:var(--ink)}
.nh-np-head button{border:none;background:transparent;font-size:17px;cursor:pointer;color:var(--muted)}
.nh-np-add{padding:14px 16px;border-bottom:1px solid var(--line)}
.nh-np-add textarea{width:100%;border:1px solid var(--line);border-radius:12px;padding:10px 12px;font:inherit;font-size:14px;resize:vertical;background:var(--wash);color:var(--ink)}
.nh-np-add button{margin-top:9px;width:100%;border:none;background:var(--ink);color:#fff;font:inherit;font-weight:700;padding:11px;border-radius:11px;cursor:pointer}
.nh-np-list{flex:1;overflow:auto;padding:14px 16px}
.nh-note{background:var(--wash);border:1px solid var(--line);border-radius:12px;padding:12px;margin-bottom:10px}
.nh-note-tx{font-size:14px;color:var(--ink-soft);white-space:pre-wrap;line-height:1.7}
.nh-note-del{margin-top:8px;border:none;background:transparent;color:var(--coral);font-size:12.5px;font-weight:700;cursor:pointer;padding:0}
.nh-np-empty{color:var(--muted);font-size:14px;text-align:center;padding:26px 0}

/* Toast */
.nh-toast{position:fixed;bottom:76px;left:50%;transform:translateX(-50%) translateY(10px);z-index:95;
  background:var(--ink);color:#fff;font-size:13.5px;font-weight:600;padding:10px 20px;border-radius:100px;
  opacity:0;pointer-events:none;transition:.25s}
.nh-toast.show{opacity:1;transform:translateX(-50%)}

/* Dark mode for reading tools */
body.nh-dark-reader #nh-read-bar{background:rgba(17,26,43,.9);border-color:#1E293B}
body.nh-dark-reader #nh-read-bar button{color:#CBD5E1}
body.nh-dark-reader #nh-read-bar button:hover{background:#1E293B;color:#F1F5F9}
body.nh-dark-reader #nh-notes-panel{background:#111A2B;border-color:#1E293B}
body.nh-dark-reader .nh-note{background:#0F172A;border-color:#1E293B}
body.nh-dark-reader .nh-hl{filter:saturate(.75) brightness(.82);color:#0B1120}

@media(max-width:640px){
  #nh-read-bar{bottom:12px;padding:5px 6px}
  #nh-read-bar button{min-width:38px;height:38px}
  .nh-sel-menu button{width:32px;height:32px}
}