/* =========================================================
   «مصنع الشريحة» — نظام التصميم
   ---------------------------------------------------------
   الفكرة: الدورة رقاقة سيليكون. كل درس «شريحة» تُصنَّع.
   الكهرماني = ضوء غرفة الطباعة الضوئية (بوابات، تجارب، طاقة).
   القزحي  = لمعان الرقاقة (للإتقان والإنجاز فقط).
   الأزرق/الوردي = إلكترونات/فجوات (للفيزياء فقط).
   ========================================================= */
@font-face{font-family:"Thmanyah Sans";src:url(fonts/thmanyahsans-Regular.woff2) format("woff2");font-weight:400;font-display:swap}
@font-face{font-family:"Thmanyah Sans";src:url(fonts/thmanyahsans-Medium.woff2) format("woff2");font-weight:500;font-display:swap}
@font-face{font-family:"Thmanyah Sans";src:url(fonts/thmanyahsans-Bold.woff2) format("woff2");font-weight:700;font-display:swap}
@font-face{font-family:"Thmanyah Sans";src:url(fonts/thmanyahsans-Black.woff2) format("woff2");font-weight:900;font-display:swap}
@font-face{font-family:"Thmanyah Display";src:url(fonts/thmanyahserifdisplay-Bold.woff2) format("woff2");font-weight:700;font-display:swap}
@font-face{font-family:"Thmanyah Display";src:url(fonts/thmanyahserifdisplay-Black.woff2) format("woff2");font-weight:900;font-display:swap}

@property --sheen{syntax:"<angle>";inherits:false;initial-value:0deg}

:root{
  /* الألوان */
  --indigo:#1C1747;      /* حبر الرقاقة: النص والأجهزة */
  --indigo-2:#2B2566;
  --indigo-3:#5B5591;
  --mist:#EEF0F7;        /* هواء الغرفة النظيفة: الخلفية */
  --panel:#FFFFFF;
  --hair:#D9DCEA;
  --amber:#FFB800;       /* ضوء الطباعة الضوئية */
  --amber-ink:#8A5A00;
  --amber-tint:#FFF4D1;
  --electron:#2F5BFF;
  --electron-tint:#E4EAFF;
  --hole:#FF3366;
  --hole-tint:#FFE3EA;
  --pass:#12B886;
  --pass-tint:#DDF7EE;
  --fail:#E5484D;
  --fail-tint:#FDE7E8;
  --dream:#E9E6FF;       /* لون التشبيهات: الخيال */
  --iris:conic-gradient(from var(--sheen),#7B5CFF,#2FD3C9,#B8F27C,#FFD166,#FF6FB5,#7B5CFF);
  --iris-lin:linear-gradient(90deg,#7B5CFF,#2FD3C9,#FFD166,#FF6FB5);
  /* الخطوط */
  --f-body:"Thmanyah Sans","Segoe UI",Tahoma,sans-serif;
  --f-display:"Thmanyah Display","Thmanyah Sans","Segoe UI",serif;
  --f-mono:"Cascadia Mono","Cascadia Code",Consolas,"Courier New",monospace;
  --r:18px;
  --r-sm:12px;
  --rail:250px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{margin:0;background:var(--mist);color:var(--indigo);font-family:var(--f-body);font-size:18.5px;line-height:1.9;font-weight:400}
img{max-width:100%}
a{color:var(--electron);text-underline-offset:3px}
::selection{background:var(--amber);color:var(--indigo)}
:focus-visible{outline:3px solid var(--amber);outline-offset:3px;border-radius:6px}
p{margin:.55em 0}
b,strong{font-weight:700}
h1,h2,h3,h4{font-family:var(--f-display);font-weight:900;line-height:1.35;letter-spacing:0;margin:1.3em 0 .45em}
h3{font-size:1.35rem;font-family:var(--f-body);font-weight:900}
h4{font-size:1.1rem;font-family:var(--f-body);font-weight:700}
ul,ol{padding-inline-start:1.3rem}
li{margin:.2em 0}
.en,.ltr{direction:ltr;unicode-bidi:isolate}
.en{font-family:var(--f-mono);font-size:.82em;color:var(--indigo-3);letter-spacing:.02em}
.ltr{display:inline-block}
.muted{color:var(--indigo-3)}
.small{font-size:.86rem}
.c-e{color:var(--electron);font-weight:700}
.c-h{color:var(--hole);font-weight:700}
.c-a{color:var(--amber-ink);font-weight:700}
.mono{font-family:var(--f-mono)}
code{font-family:var(--f-mono);font-size:.85em;background:#fff;border:1px solid var(--hair);border-radius:6px;padding:0 .35em}
.mark{background:linear-gradient(transparent 58%,rgba(255,184,0,.55) 58%);padding:0 .1em}

/* =========================================================
   الهيكل: شريط علوي + سكة جانبية (المسار النحاسي) + المحتوى
   ========================================================= */
.topbar{position:sticky;top:0;z-index:60;background:rgba(238,240,247,.86);backdrop-filter:saturate(1.4) blur(10px);border-bottom:1px solid var(--hair)}
.topbar-inner{max-width:1240px;margin:0 auto;padding:.5rem 1.2rem;display:flex;align-items:center;gap:1rem}
.brand{display:flex;align-items:center;gap:.55rem;text-decoration:none;color:var(--indigo);font-weight:900;white-space:nowrap}
.brand-chip{width:26px;height:26px;border-radius:7px;background:var(--iris);animation:sheen 9s linear infinite;box-shadow:inset 0 0 0 3px rgba(255,255,255,.55)}
.topbar .title{flex:1;min-width:0;font-size:.92rem;color:var(--indigo-3);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.pnav{display:flex;gap:.4rem}
.pnav a,.pnav span{font-size:.85rem;font-weight:700;padding:.3rem .85rem;border-radius:999px;text-decoration:none;color:var(--indigo);background:#fff;border:1px solid var(--hair);white-space:nowrap}
.pnav a:hover{border-color:var(--indigo)}
.pnav span.disabled{opacity:.5;cursor:not-allowed}
.progress{height:3px;background:transparent}
.progress>i{display:block;height:100%;width:0;background:var(--amber);box-shadow:0 0 12px var(--amber);transition:width .8s cubic-bezier(.2,.8,.2,1)}

.shell{max-width:1240px;margin:0 auto;display:grid;grid-template-columns:var(--rail) minmax(0,1fr);gap:2.5rem;padding:0 1.2rem}
.rail{position:sticky;top:64px;align-self:start;padding:2rem 0 2rem;max-height:calc(100vh - 70px);overflow:auto;scrollbar-width:thin}
.rail-t{font-weight:900;font-size:.8rem;color:var(--indigo-3);margin:0 0 .8rem}
.trace{list-style:none;margin:0;padding:0;position:relative}
.trace::before{content:"";position:absolute;inset-inline-start:11px;top:12px;bottom:12px;width:3px;background:#C3C7DD;border-radius:3px}
.trace .flow{position:absolute;inset-inline-start:11px;top:12px;width:3px;height:0;border-radius:3px;background:var(--amber);box-shadow:0 0 10px var(--amber);transition:height 1s cubic-bezier(.2,.8,.2,1)}
.trace li{position:relative;margin:0;padding:.55rem 2.2rem .55rem 0;font-size:.9rem;line-height:1.55}
.trace li a{color:var(--indigo-3);text-decoration:none;display:block}
.trace li::before{content:"";position:absolute;inset-inline-start:4px;top:.75rem;width:17px;height:17px;border-radius:5px;background:var(--mist);border:3px solid var(--hair);transition:all .4s}
.trace li.open a{color:var(--indigo);font-weight:700}
.trace li.open::before{border-color:var(--amber);background:#fff;box-shadow:0 0 0 4px rgba(255,184,0,.22)}
.trace li.done a{color:var(--indigo)}
.trace li.done::before{border-color:var(--amber);background:var(--amber)}
.trace li.locked a{pointer-events:none}
.trace li.final::before{border-radius:50%}
.trace li.final.done::before{background:var(--iris);border-color:#fff;animation:sheen 6s linear infinite}

.lesson{min-width:0;max-width:820px;padding:1.5rem 0 6rem}

/* =========================================================
   الافتتاحية: سؤال الدرس هو العنوان
   ========================================================= */
.hero{padding:2.2rem 0 1.4rem;margin-bottom:1.2rem;position:relative}
.kicker{font-weight:700;font-size:.85rem;color:var(--indigo-3);display:inline-flex;align-items:center;gap:.6rem}
.kicker::before{content:"";width:34px;height:4px;border-radius:2px;background:var(--iris-lin)}
.hero h1{font-size:clamp(2.2rem,5.2vw,3.6rem);line-height:1.22;margin:.45rem 0 .7rem;max-width:16ch}
.hero .lede{font-size:1.18rem;max-width:42ch;color:var(--indigo-2);margin:.2rem 0 1rem}
.hero .goals{list-style:none;padding:0;margin:1.2rem 0 0;display:flex;flex-wrap:wrap;gap:.5rem}
.hero .goals li{background:#fff;border:1px solid var(--hair);border-radius:999px;padding:.25rem .95rem;font-size:.9rem;margin:0}
.hero .goals li::before{content:"◆ ";color:var(--amber)}

/* =========================================================
   الخطوات (أقسام الدرس)
   ========================================================= */
.step{position:relative;padding:2.4rem 0 1.4rem;border-top:1px solid var(--hair)}
.step:first-of-type{border-top:0}
.step-head{display:flex;align-items:baseline;gap:.9rem;margin-bottom:.6rem}
.step-num{flex:none;font-family:var(--f-body);font-size:.8rem;font-weight:700;color:var(--amber-ink);background:var(--amber-tint);border-radius:6px;padding:.1rem .5rem;transform:translateY(-.35rem)}
.step.done .step-num{background:var(--amber);color:var(--indigo)}
.step-head h2{margin:0;font-size:clamp(1.65rem,3.4vw,2.25rem)}
.step > p, .step > ul, .step > ol{max-width:68ch}
.step.reveal{animation:expose .9s cubic-bezier(.2,.8,.2,1) both}
@keyframes expose{from{opacity:0;filter:blur(6px) sepia(1) saturate(3) hue-rotate(-15deg);transform:translateY(14px)}to{opacity:1;filter:none;transform:none}}

/* القسم المقفل: «مقاوم ضوئي لم يُعرَّض بعد» */
.step.locked{min-height:120px;border-radius:var(--r);border:0;margin:1.5rem 0;padding:0;overflow:hidden;
  background:repeating-linear-gradient(135deg,#F3E7C2 0 14px,#EFE0B4 14px 28px)}
.step.locked > *:not(.lock-msg){display:none !important}
.lock-msg{display:none}
.step.locked .lock-msg{display:flex;align-items:center;gap:1rem;padding:1.6rem 1.6rem;color:var(--amber-ink);font-weight:700}
.lock-msg .ico{font-size:1.6rem;width:52px;height:52px;flex:none;border-radius:14px;display:grid;place-items:center;background:rgba(255,255,255,.6)}
.lock-msg small{display:block;font-weight:400;color:#9a7a33;font-size:.85rem}

/* =========================================================
   أنواع المحتوى
   ========================================================= */
.box{margin:1.4rem 0;position:relative;border-radius:var(--r)}
.box > .box-t{display:block;font-weight:900;margin-bottom:.25rem}

/* قاعدة/فكرة مفتاحية: كتلة نيلية معكوسة */
.key{background:var(--indigo);color:#fff;padding:1.3rem 1.5rem}
.key > .box-t{font-size:.85rem;color:var(--amber);font-weight:900}
.key b,.key strong{color:#FFD873}
.key a{color:#9fb4ff}

/* تشبيه: بطاقة الخيال */
.analogy{background:var(--dream);padding:1.2rem 1.4rem 1.2rem;border-radius:var(--r)}
.analogy > .box-t{font-family:var(--f-display);font-size:1.25rem;color:var(--indigo-2)}
.analogy .limit,.analogy .small.muted{display:block;margin-top:.7rem;padding-top:.6rem;border-top:1px dashed #c4bdf5;font-size:.88rem;color:var(--indigo-3)}
.analogy .limit::before,.analogy .small.muted::before{content:"أين يتوقف التشبيه؟ ";font-weight:900;color:var(--indigo-2)}
/* جدول المقابلة: الحياة ↔ البلورة */
.pair{display:grid;grid-template-columns:1fr auto 1fr;gap:.45rem .7rem;margin:.8rem 0 .2rem;align-items:center}
.pair .h{font-size:.8rem;font-weight:900;color:var(--indigo-3)}
.pair .l,.pair .r{background:#fff;border-radius:10px;padding:.35rem .8rem;font-size:.95rem;line-height:1.6}
.pair .r{background:var(--indigo);color:#fff}
.pair .eqs{color:var(--indigo-3);font-weight:900}

.note{border-inline-start:4px solid var(--indigo-3);padding:.2rem 1.2rem;border-radius:0}
.note > .box-t{color:var(--indigo-2)}

/* خطأ شائع: الجملة الخاطئة مشطوبة ثم الصحيحة */
.warn,.misconception{background:#fff;border:2px solid var(--fail-tint);padding:1.1rem 1.4rem}
.warn > .box-t,.misconception > .box-t{color:var(--fail)}
.warn > .box-t::before,.misconception > .box-t::before{content:"✕  "}
.wrong-line{display:block;text-decoration:line-through;text-decoration-color:var(--fail);text-decoration-thickness:2px;color:var(--indigo-3)}
.right-line{display:block;font-weight:700}
.right-line::before{content:"✓ ";color:var(--pass)}

/* للامتحان */
.exam{background:#fff;border:1px solid var(--hair);padding:1.1rem 1.4rem}
.exam > .box-t{font-size:.9rem;color:var(--electron)}
.exam > .box-t::before{content:"◎ ";}

/* تصحيح لخطأ في الكتاب */
.textbook-fix{background:var(--amber-tint);padding:1.1rem 1.4rem}
.textbook-fix > .box-t{color:var(--amber-ink)}
.textbook-fix > .box-t::before{content:"⚠ "}

/* =========================================================
   المعادلات
   ========================================================= */
.eq{text-align:center;font-size:1.35rem;font-weight:700;margin:1.4rem 0;padding:1rem 1.2rem;background:#fff;border-radius:var(--r);overflow-x:auto;position:relative}
.eq::before{content:"";position:absolute;inset-inline-start:0;top:18%;bottom:18%;width:4px;border-radius:4px;background:var(--amber)}
.eq .frac{display:inline-flex;flex-direction:column;vertical-align:middle;text-align:center;margin:0 .3rem;line-height:1.5}
.eq .frac>span:first-child{border-bottom:2px solid currentColor;padding:0 .35rem}
.eq .frac>span:last-child{padding:0 .35rem}
.eq small{display:block;font-size:.8rem;font-weight:400;color:var(--indigo-3);margin-top:.3rem}
sub,sup{font-size:.68em}

/* =========================================================
   الجداول والأشكال
   ========================================================= */
.tbl-wrap{overflow-x:auto;margin:1.2rem 0}
.tbl{width:100%;border-collapse:separate;border-spacing:0;background:#fff;border-radius:var(--r-sm);overflow:hidden;font-size:.95rem}
.tbl th,.tbl td{padding:.6rem .8rem;text-align:center;border-bottom:1px solid var(--mist)}
.tbl th{background:var(--indigo);color:#fff;font-weight:700}
.tbl tr:last-child td{border-bottom:0}
figure{margin:1.6rem 0;text-align:center}
figcaption{font-size:.86rem;color:var(--indigo-3);margin-top:.5rem}
.svg-fig svg{max-width:100%;height:auto}
.book-fig{display:inline-block;background:#fff;padding:.7rem;border-radius:var(--r-sm)}
.book-fig img{max-height:260px}
.two-col{display:grid;grid-template-columns:1fr 1fr;gap:1.2rem;align-items:start}

/* =========================================================
   المحاكاة: «طاولة القياس» — إطار جهاز نيلي وشاشة فاتحة
   ========================================================= */
.sim{background:var(--indigo);color:#E7E5FF;border-radius:22px;padding:1rem 1rem 1.1rem;margin:1.8rem 0;box-shadow:0 18px 40px -22px rgba(28,23,71,.6)}
.sim-title{display:flex;align-items:center;gap:.6rem;font-weight:700;font-size:1rem;margin:.1rem .3rem .8rem;color:#fff}
.sim-title::before{content:"LIVE";font-family:var(--f-mono);font-size:.68rem;letter-spacing:.14em;color:var(--indigo);background:var(--amber);border-radius:4px;padding:.05rem .4rem}
.sim canvas,.sim svg{width:100%;display:block;background:#F7F8FC;border-radius:14px;touch-action:none}
.sim .small,.sim .muted{color:#B9B5E6}
.sim a{color:#FFD873}
.sim .tbl th{background:var(--indigo-2)}
.sim .tbl td{color:var(--indigo)}
.controls{display:flex;flex-wrap:wrap;gap:.6rem;margin-top:.9rem;align-items:center}
.ctl{display:flex;align-items:center;gap:.6rem;font-size:.9rem;background:var(--indigo-2);border-radius:12px;padding:.35rem .8rem;color:#E7E5FF}
.ctl input[type=range]{width:150px;accent-color:var(--amber)}
.ctl input[type=checkbox],.ctl input[type=radio]{accent-color:var(--amber);width:17px;height:17px}
.ctl output{font-family:var(--f-body);font-variant-numeric:tabular-nums;font-weight:900;color:var(--amber);min-width:5em;text-align:center;direction:ltr;unicode-bidi:isolate}
.ctl select{font-family:var(--f-body);background:var(--indigo);color:#fff;border:1px solid var(--indigo-3);border-radius:8px;padding:.15rem .4rem}
.readout{display:flex;flex-wrap:wrap;gap:.45rem;margin-top:.7rem}
.readout .chip{background:rgba(255,255,255,.07);border:1px solid rgba(255,255,255,.12);border-radius:10px;padding:.2rem .75rem;font-size:.88rem;color:#E7E5FF}
.readout .chip b{color:var(--amber);font-weight:900}
.legend{display:flex;flex-wrap:wrap;gap:1rem;font-size:.84rem;margin-top:.6rem;color:#C9C5F0}
.legend i{display:inline-block;width:11px;height:11px;border-radius:50%;vertical-align:middle;margin-inline-end:.35rem}

/* الأزرار */
.btn{font-family:var(--f-body);font-size:.95rem;font-weight:700;cursor:pointer;border:0;background:var(--indigo);color:#fff;border-radius:12px;padding:.55rem 1.2rem;transition:transform .12s,box-shadow .2s,background .2s;text-decoration:none;display:inline-block;line-height:1.5}
.btn:hover{background:var(--indigo-2);box-shadow:0 6px 16px -8px rgba(28,23,71,.6)}
.btn:active{transform:scale(.97)}
.btn.ghost{background:#fff;color:var(--indigo);box-shadow:inset 0 0 0 1.5px var(--hair)}
.btn.ghost:hover{box-shadow:inset 0 0 0 1.5px var(--indigo)}
.btn.sm{font-size:.84rem;padding:.3rem .8rem;border-radius:9px}
.btn[disabled]{opacity:.45;cursor:not-allowed}
.sim .btn{background:var(--amber);color:var(--indigo)}
.sim .btn:hover{background:#FFC933}
.sim .btn.ghost{background:transparent;color:#fff;box-shadow:inset 0 0 0 1.5px var(--indigo-3)}
.seg{display:inline-flex;background:var(--indigo);border-radius:10px;padding:3px;gap:2px}
.seg button{font-family:var(--f-body);border:0;background:transparent;color:#C9C5F0;padding:.25rem .8rem;border-radius:8px;cursor:pointer;font-weight:700;font-size:.9rem}
.seg button.on{background:var(--amber);color:var(--indigo)}

/* المصطلحات */
.term{border-bottom:2px dotted var(--electron);cursor:help;position:relative}
.term:hover::after,.term:focus::after{content:attr(data-def);position:absolute;bottom:135%;right:50%;transform:translateX(50%);width:max-content;max-width:270px;background:var(--indigo);color:#fff;font-size:.82rem;line-height:1.7;padding:.5rem .75rem;border-radius:10px;z-index:30;font-weight:400}

/* =========================================================
   البوابة (أسئلة التحقق) — شريط الضوء الكهرماني
   ========================================================= */
.quiz{margin:2.2rem 0 .5rem;background:#fff;border-radius:22px;overflow:hidden;box-shadow:0 1px 0 var(--hair)}
.quiz-head{display:flex;align-items:center;gap:.8rem;padding:.8rem 1.3rem;font-weight:900;color:var(--indigo);
  background:repeating-linear-gradient(135deg,var(--amber) 0 16px,#FFC933 16px 32px)}
.quiz-head::before{content:"";width:12px;height:12px;border-radius:50%;background:var(--indigo);box-shadow:0 0 0 4px rgba(28,23,71,.18);flex:none}
.quiz-head .sub{font-weight:500;font-size:.85rem;opacity:.8}
.quiz.passed .quiz-head{background:var(--pass);color:#fff}
.quiz.passed .quiz-head::before{background:#fff;box-shadow:0 0 0 4px rgba(255,255,255,.3)}
.q{padding:1.1rem 1.3rem;border-bottom:1px solid var(--mist);transition:background .4s}
.q.correct{background:linear-gradient(90deg,transparent,var(--pass-tint))}
.q-n{font-family:var(--f-mono);font-weight:700;color:var(--amber-ink);margin-inline-end:.45rem}
.q-tag{font-size:.7rem;font-weight:700;color:var(--indigo-3);border:1px solid var(--hair);border-radius:999px;padding:0 .55rem;margin-inline-start:.5rem;vertical-align:middle;white-space:nowrap}
.q-text{margin:.1rem 0 .8rem;font-weight:700;font-size:1.04rem}
.opts{list-style:none;margin:0;padding:0;display:grid;gap:.5rem}
.opts.two{grid-template-columns:1fr 1fr}
.opt{display:flex;gap:.7rem;align-items:flex-start;padding:.6rem .9rem;border-radius:12px;background:var(--mist);cursor:pointer;transition:transform .12s,background .15s,box-shadow .15s;line-height:1.65}
.opt:hover{background:#E3E6F3;transform:translateX(-3px)}
.opt .letter{flex:none;font-family:var(--f-mono);font-weight:700;width:1.8rem;height:1.8rem;border-radius:8px;background:#fff;display:grid;place-items:center;font-size:.8rem;color:var(--indigo-3)}
.opt.sel-ok{background:var(--pass);color:#fff}
.opt.sel-ok .letter{color:var(--pass)}
.opt.sel-bad{background:var(--fail-tint);box-shadow:inset 0 0 0 2px var(--fail);animation:shake .35s}
.opt.dim{opacity:.4}
.q.correct .opt{cursor:default;transform:none}
@keyframes shake{25%{transform:translateX(-5px)}50%{transform:translateX(5px)}75%{transform:translateX(-2px)}}
.q input.ans,.q select.ans,.q textarea.ans{font-family:var(--f-body);font-size:1rem;border:0;background:var(--mist);border-radius:10px;padding:.4rem .7rem;min-width:7.5rem;color:var(--indigo)}
.q input.ans:focus,.q select.ans:focus,.q textarea.ans:focus{outline:2px solid var(--amber);background:#fff}
.q .ans.ok{background:var(--pass-tint);box-shadow:inset 0 0 0 2px var(--pass)}
.q .ans.bad{background:var(--fail-tint);box-shadow:inset 0 0 0 2px var(--fail)}
.q .row{display:flex;flex-wrap:wrap;gap:.5rem;align-items:center}
.q .unit{color:var(--indigo-3);font-weight:700}
.fb{display:none;margin-top:.7rem;border-radius:12px;padding:.6rem .9rem;font-size:.95rem;line-height:1.8}
.fb.show{display:block}
.fb.ok{background:var(--pass-tint);color:#0B6B4E}
.fb.bad{background:var(--fail-tint);color:#9B1C20}
.fb.info{background:var(--mist);color:var(--indigo-2)}
.hint-btn{margin-top:.6rem}
.model{display:none;margin-top:.7rem;background:var(--dream);padding:.8rem 1rem;border-radius:12px}
.model.show{display:block}
.quiz-foot{display:flex;align-items:center;gap:.8rem;flex-wrap:wrap;padding:.8rem 1.3rem}
.score{font-weight:700}
.gate-ok{color:var(--pass);font-weight:900}

/* اختبار الإتقان: البوابة النهائية بإطار قزحي */
.step.final .quiz{padding:3px;background:var(--iris);animation:sheen 12s linear infinite}
.step.final .quiz > *{background:#fff}
.step.final .quiz > .quiz-head{background:var(--indigo);color:#fff;border-radius:19px 19px 0 0}
.step.final .quiz > .quiz-head::before{background:var(--amber)}
.step.final .quiz > :last-child{border-radius:0 0 19px 19px}
.result{display:none;padding:1.2rem 1.3rem}
.result.show{display:block}
.result.pass{background:var(--pass-tint) !important}
.result.fail{background:var(--fail-tint) !important}
.next-cta{margin-top:.7rem}

/* =========================================================
   النشاط العملي: لوح التجارب
   ========================================================= */
.lab{margin:2rem 0;border-radius:22px;padding:1.3rem 1.4rem 1.2rem;position:relative;
  background:#fff radial-gradient(circle,#D9DCEA 1.6px,transparent 1.8px) 0 0/18px 18px}
.lab::before{content:"";position:absolute;inset:0;border-radius:22px;box-shadow:inset 0 0 0 2px var(--amber);pointer-events:none}
.lab > *{position:relative}
.lab > .box-t{display:flex;align-items:center;gap:.6rem;font-family:var(--f-display);font-size:1.35rem;font-weight:900;margin-bottom:.3rem}
.lab > .box-t::before{content:"جرّبها بيدك";font-family:var(--f-body);font-size:.75rem;font-weight:900;background:var(--amber);color:var(--indigo);border-radius:6px;padding:.1rem .55rem;white-space:nowrap}
.lab .mats{list-style:none;padding:0;margin:.6rem 0 .8rem;display:flex;flex-wrap:wrap;gap:.4rem}
.lab .mats li{margin:0;background:var(--indigo);color:#fff;border-radius:8px;padding:.1rem .7rem;font-size:.86rem}
.lab ol{background:rgba(255,255,255,.88);border-radius:12px;padding:.6rem 2rem .6rem 1rem;margin:.4rem 0}
.lab .safety{background:var(--fail-tint);border-radius:10px;padding:.45rem .8rem;font-size:.88rem;margin:.6rem 0;color:#7A1A1D}
.lab .safety::before{content:"سلامة · ";font-weight:900}
.lab details{background:var(--indigo);color:#fff;border-radius:12px;padding:.55rem .9rem;margin-top:.7rem}
.lab details b{color:#FFD873}
.lab summary{cursor:pointer;font-weight:700;color:var(--amber)}
.lab .noLab{font-size:.86rem;color:var(--indigo-3);margin-top:.6rem;background:rgba(255,255,255,.9);display:inline-block;border-radius:8px;padding:.1rem .6rem}
.lab .noLab::before{content:"بلا أدوات؟ ";font-weight:900;color:var(--indigo-2)}

/* =========================================================
   الصفحة الرئيسة: الرقاقة
   ========================================================= */
.home{max-width:1240px;margin:0 auto;padding:0 1.2rem 4rem}
.home-hero{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.05fr);gap:3rem;align-items:center;padding:3rem 0 2rem}
.home-hero h1{font-size:clamp(2.6rem,6vw,4.6rem);line-height:1.15;margin:.3rem 0 1rem}
.home-hero h1 .iris{background:var(--iris-lin);-webkit-background-clip:text;background-clip:text;color:transparent}
.home-hero .lede{font-size:1.2rem;max-width:38ch;color:var(--indigo-2)}
.how{list-style:none;padding:0;margin:1.6rem 0 0;display:grid;gap:.6rem;max-width:44ch}
.how li{display:flex;gap:.8rem;align-items:flex-start;margin:0;font-size:.98rem;line-height:1.7}
.how li i{flex:none;font-style:normal;width:28px;height:28px;border-radius:8px;display:grid;place-items:center;font-size:.9rem}
.how .k1{background:var(--amber)} .how .k2{background:var(--dream)} .how .k3{background:var(--indigo);color:#fff}
.wafer-wrap{position:relative}
.wafer{width:100%;max-width:560px;margin:0 auto;display:block;aspect-ratio:1;filter:drop-shadow(0 30px 40px rgba(28,23,71,.28))}
.wafer .die{cursor:pointer;transition:transform .25s,filter .25s;transform-box:fill-box;transform-origin:center}
.wafer .die.locked{cursor:not-allowed}
.wafer .die:not(.locked):hover,.wafer .die.hi{transform:scale(1.12);filter:drop-shadow(0 4px 8px rgba(0,0,0,.35))}
.wafer .die.open rect{animation:litho 2.4s ease-in-out infinite}
@keyframes litho{50%{fill:#FFD873}}
.die-tip{position:absolute;pointer-events:none;background:var(--indigo);color:#fff;border-radius:12px;padding:.5rem .8rem;font-size:.88rem;max-width:240px;opacity:0;transition:opacity .15s;z-index:5;line-height:1.6}
.die-tip.show{opacity:1}
.die-tip b{color:var(--amber)}
.overall{font-size:.92rem;color:var(--indigo-3);margin-top:1rem;text-align:center}
.overall b{color:var(--indigo);font-size:1.05rem}

.map{display:grid;grid-template-columns:repeat(auto-fill,minmax(270px,1fr));gap:.9rem;margin:2rem 0}
.card{background:#fff;border-radius:var(--r);padding:1.1rem 1.2rem;text-decoration:none;color:var(--indigo);display:flex;flex-direction:column;gap:.25rem;position:relative;transition:transform .2s,box-shadow .2s;outline-offset:3px}
a.card:hover,.card.hi{transform:translateY(-4px);box-shadow:0 14px 30px -18px rgba(28,23,71,.5)}
.card .n{font-size:.8rem;font-weight:700;color:var(--indigo-3)}
.card .t{font-weight:900;font-size:1.12rem;line-height:1.5}
.card .d{font-size:.9rem;color:var(--indigo-3);line-height:1.7}
.card .st{font-size:.8rem;font-weight:900;margin-top:auto;padding-top:.6rem}
.card.locked{background:transparent;box-shadow:inset 0 0 0 1.5px var(--hair)}
.card.locked .t,.card.locked .d{opacity:.55}
.card.locked .st{color:var(--indigo-3)}
.card.open{box-shadow:inset 0 0 0 2px var(--amber)}
.card.open .st{color:var(--amber-ink)}
.card.done::after{content:"";position:absolute;inset-inline-end:1rem;top:1rem;width:18px;height:18px;border-radius:5px;background:var(--iris);animation:sheen 8s linear infinite}
.card.done .st{color:var(--pass)}
.home-note{display:flex;flex-wrap:wrap;gap:1rem;align-items:center;justify-content:space-between;background:#fff;border-radius:var(--r);padding:1rem 1.3rem;font-size:.88rem;color:var(--indigo-3)}
.foot{max-width:1240px;margin:0 auto;padding:1.5rem 1.2rem 2.5rem;color:var(--indigo-3);font-size:.82rem;text-align:center}

.badge{display:inline-block;font-size:.72rem;font-weight:900;border-radius:999px;padding:.05rem .6rem;vertical-align:middle}
.badge.extra{background:var(--dream);color:var(--indigo-2)}
.badge.book{background:var(--amber-tint);color:var(--amber-ink)}

@keyframes sheen{to{--sheen:360deg}}

/* =========================================================
   الشاشات الصغيرة والحركة المخفضة والطباعة
   ========================================================= */
@media (max-width:980px){
  .shell{grid-template-columns:1fr;gap:0}
  .rail{display:none}
  .home-hero{grid-template-columns:1fr;gap:1.5rem;padding-top:1.5rem}
  .wafer{max-width:440px}
}
@media (max-width:640px){
  body{font-size:17px}
  .two-col,.opts.two{grid-template-columns:1fr}
  .topbar .title{display:none}
  .pair{grid-template-columns:1fr;gap:.3rem}
  .pair .eqs{display:none}
  .pair .r{margin-bottom:.4rem}
  .sim{padding:.7rem;border-radius:16px}
  .ctl input[type=range]{width:120px}
}
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation:none !important;transition:none !important;scroll-behavior:auto !important}
}
@media print{
  .topbar,.rail,.controls,.quiz,.sim canvas{display:none}
  .shell{display:block}
  .step.locked > *{display:block !important}
}
.sim .tbl .small{color:var(--indigo-3)}