/* ===================== 421 ENGINEERING COURSES — نظام التصميم ===================== */
@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Mono:wght@500;600;700&display=swap');

/* ---------- خط ثمانية (Thmanyah) — الخط الأساسي للموقع ---------- */
/* عائلة "ثمانية سانس" — للواجهة والنصوص العامة */
@font-face{font-family:'Thmanyah Sans';src:url('assets/fonts/thmanyah-sans/thmanyahsans-Light.woff2') format('woff2');font-weight:300;font-style:normal;font-display:swap}
@font-face{font-family:'Thmanyah Sans';src:url('assets/fonts/thmanyah-sans/thmanyahsans-Regular.woff2') format('woff2');font-weight:400;font-style:normal;font-display:swap}
@font-face{font-family:'Thmanyah Sans';src:url('assets/fonts/thmanyah-sans/thmanyahsans-Medium.woff2') format('woff2');font-weight:500;font-style:normal;font-display:swap}
@font-face{font-family:'Thmanyah Sans';src:url('assets/fonts/thmanyah-sans/thmanyahsans-Bold.woff2') format('woff2');font-weight:700;font-style:normal;font-display:swap}
@font-face{font-family:'Thmanyah Sans';src:url('assets/fonts/thmanyah-sans/thmanyahsans-Black.woff2') format('woff2');font-weight:900;font-style:normal;font-display:swap}
/* عائلة "ثمانية سيريف ديسبلاي" — للعناوين الكبيرة (هيرو، H1) فقط، للمسة تحريرية مميزة */
@font-face{font-family:'Thmanyah Serif Display';src:url('assets/fonts/thmanyah-serif-display/thmanyahserifdisplay-Medium.woff2') format('woff2');font-weight:500;font-style:normal;font-display:swap}
@font-face{font-family:'Thmanyah Serif Display';src:url('assets/fonts/thmanyah-serif-display/thmanyahserifdisplay-Bold.woff2') format('woff2');font-weight:700;font-style:normal;font-display:swap}
@font-face{font-family:'Thmanyah Serif Display';src:url('assets/fonts/thmanyah-serif-display/thmanyahserifdisplay-Black.woff2') format('woff2');font-weight:900;font-style:normal;font-display:swap}

:root{
  --font-body:'Thmanyah Sans','IBM Plex Mono',Tahoma,Arial,sans-serif;
  --font-display:'Thmanyah Serif Display','Thmanyah Sans',Tahoma,Arial,sans-serif;
  --mono:'IBM Plex Mono',ui-monospace,Consolas,monospace;
  /* 421 ENGINEERING COURSES — هوية بصرية جديدة (كحلي / ذهبي / برتقالي / أسود / أبيض) */
  --navy:#0A2036;
  --navy-mid:#173A5C;
  --steel:#1E4E78;
  --steel-light:#3874A8;
  --gold:#F5C442;
  --gold-light:#F9D877;
  --amber:#E8973F;
  --black:#0A0A0B;
  --bg:#F4F6F8;
  --ink:#12181F;
  --muted:#5A6B7A;
  --line:#E1E6EA;
  --white:#ffffff;
  --success:#1F9D55;
  --danger:#D84343;
  --radius-sm:8px;
  --radius:14px;
  --radius-lg:20px;
  --shadow-sm:0 4px 14px rgba(10,32,54,.08);
  --shadow:0 14px 36px rgba(10,32,54,.16);
  --grad-navy:linear-gradient(135deg,var(--navy),var(--steel));
  --grad-amber:linear-gradient(135deg,var(--gold-light),var(--amber));
  --grad-brand:linear-gradient(95deg,var(--gold) 0%,var(--amber) 55%,var(--navy-mid) 100%);
  --grad-mega:linear-gradient(120deg,#ffffff 0%,#5f8fd6 16%,#173a5c 32%,#0a1420 48%,#3a2410 58%,var(--amber) 72%,var(--gold) 100%);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
@media (prefers-reduced-motion:reduce){ html{scroll-behavior:auto} *{animation-duration:.001ms !important;transition-duration:.001ms !important} }
body{margin:0;background:linear-gradient(175deg,#F1F4F8 0%,#EAF0F6 30%,#F0EBDD 68%,#F6EEDD 100%);color:var(--ink);font-family:var(--font-body);min-height:100vh;-webkit-font-smoothing:antialiased;position:relative}
h1{font-family:var(--font-display)}
body::before{
  content:"";position:fixed;inset:-10% -10%;z-index:-2;pointer-events:none;
  background-image:
    linear-gradient(rgba(23,58,92,.055) 1px,transparent 1px),
    linear-gradient(90deg,rgba(23,58,92,.055) 1px,transparent 1px);
  background-size:44px 44px,44px 44px;
  animation:bpDrift 42s linear infinite;
}
body::after{
  content:"";position:fixed;inset:0;z-index:-2;pointer-events:none;
  background-image:
    radial-gradient(circle at 6% 10%, rgba(245,196,66,.14), transparent 30%),
    radial-gradient(circle at 94% 22%, rgba(30,78,120,.10), transparent 34%),
    radial-gradient(circle at 90% 82%, rgba(232,151,63,.12), transparent 34%),
    radial-gradient(circle at 10% 86%, rgba(23,58,92,.08), transparent 34%);
}
body>.container,body>main,body>#siteHeader,body>#siteFooter{position:relative;z-index:1}
#globalWatermarks{position:fixed;inset:0;z-index:-1;pointer-events:none;overflow:hidden}
.global-gear{position:fixed;color:var(--navy-mid);opacity:.05;animation:gearSpin 90s linear infinite}
.global-gear.rev{animation:gearSpinRev 110s linear infinite}
.global-gear.gg1{width:380px;height:380px;top:-90px;inset-inline-end:-100px}
.global-gear.gg2{width:300px;height:300px;bottom:-80px;inset-inline-start:-90px;color:var(--amber)}
.global-gear.gg3{width:220px;height:220px;top:45%;inset-inline-start:-70px;opacity:.04}
@media(max-width:800px){.global-gear{opacity:.035}}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font:inherit;color:inherit}
img,video{max-width:100%;display:block}
.container{width:min(1180px,calc(100% - 40px));margin:auto;position:relative}
.muted{color:var(--muted)}
.center{text-align:center}
.section{padding:56px 0}

/* ---------- أزرار ---------- */
.btn{border:0;border-radius:var(--radius-sm);padding:12px 22px;cursor:pointer;font-weight:800;font-size:14px;white-space:nowrap;display:inline-flex;align-items:center;gap:8px;justify-content:center;transition:transform .2s,box-shadow .2s,opacity .2s}
.btn:hover{transform:translateY(-2px)}
.btn:active{transform:translateY(0) scale(.97)}
.btn:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,.course-card:focus-visible{outline:2px solid var(--amber);outline-offset:2px}
.btn:disabled{opacity:.5;cursor:default;transform:none !important}
.btn-primary{background:var(--grad-navy);color:#fff;box-shadow:0 8px 22px rgba(28,78,128,.28)}
.btn-amber{background:var(--grad-amber);color:#3a2703;box-shadow:0 8px 22px rgba(232,151,63,.35)}
.btn-outline{background:#fff;color:var(--steel);border:1.5px solid var(--line)}
.btn-outline:hover{border-color:var(--steel)}
.btn-danger{background:#fff;color:var(--danger);border:1.5px solid #f0c9c9}
.btn-sm{padding:8px 14px;font-size:12.5px;border-radius:7px}
.btn-block{width:100%}

/* ---------- الهيدر ---------- */
.site-header{position:sticky;top:0;z-index:60;background:rgba(11,30,51,.94);backdrop-filter:blur(10px)}
.site-header .container{height:70px;display:flex;align-items:center;justify-content:space-between;gap:16px}
.brand{display:flex;align-items:center;gap:9px;font-weight:900;font-size:19px;color:#fff;letter-spacing:.3px}
.brand .mark{width:34px;height:34px;border-radius:9px;background:var(--grad-amber);display:flex;align-items:center;justify-content:center;font-size:16px}
.brand svg.logo-mark{width:40px;height:auto}
.main-nav{display:flex;gap:22px}
.main-nav a{color:rgba(255,255,255,.75);font-weight:700;font-size:14px}
.main-nav a:hover, .main-nav a.active{color:#fff}
.header-actions{display:flex;align-items:center;gap:10px}
.badge{display:inline-flex;align-items:center;gap:5px;padding:5px 12px;border-radius:99px;font-size:11.5px;font-weight:800}
.badge-pending{background:rgba(245,196,66,.2);color:#a06e12}
.badge-active{background:rgba(31,157,85,.15);color:var(--success)}
.badge-suspended{background:rgba(216,67,67,.15);color:var(--danger)}
.menu-btn{display:none;background:none;border:0;color:#fff;font-size:22px;cursor:pointer}
@media(max-width:820px){ .main-nav{display:none} .menu-btn{display:block} }

.mobile-drawer{position:fixed;inset:0;z-index:90;visibility:hidden}
.mobile-drawer.open{visibility:visible}
.mobile-drawer .backdrop{position:absolute;inset:0;background:rgba(11,30,51,.5);opacity:0;transition:opacity .3s}
.mobile-drawer.open .backdrop{opacity:1}
.mobile-drawer .panel{position:absolute;top:0;inset-inline-end:0;height:100%;width:min(300px,84%);background:#fff;box-shadow:-16px 0 40px rgba(0,0,0,.2);transform:translateX(105%);transition:transform .3s cubic-bezier(.2,.8,.2,1);padding:22px 18px;display:flex;flex-direction:column;gap:4px}
html[dir=rtl] .mobile-drawer .panel{transform:translateX(-105%)}
.mobile-drawer.open .panel{transform:translateX(0)}
html[dir=rtl] .mobile-drawer.open .panel{transform:translateX(0)}
.mobile-drawer a{padding:12px 6px;font-weight:800;border-bottom:1px solid var(--line);color:var(--ink)}
.mobile-drawer .close-x{align-self:flex-start;background:none;border:0;font-size:22px;cursor:pointer;color:var(--muted)}

/* ---------- نمط هندسي متحرك (Blueprint) — يُستخدم بكل أنحاء الموقع ---------- */
@keyframes bpDrift{0%{background-position:0 0, 0 0}100%{background-position:120px 120px, 120px 120px}}
@keyframes gearSpin{to{transform:rotate(360deg)}}
@keyframes gearSpinRev{to{transform:rotate(-360deg)}}
@keyframes floaty{0%,100%{transform:translateY(0) rotate(var(--r,0deg))}50%{transform:translateY(-14px) rotate(var(--r,0deg))}}
@keyframes megaShift{0%{background-position:0% 20%}50%{background-position:100% 80%}100%{background-position:0% 20%}}
@keyframes dashMove{to{stroke-dashoffset:-120}}

.blueprint-bg{position:relative;overflow:hidden}
.site-header.blueprint-bg{position:sticky}
.blueprint-bg::before{
  content:"";position:absolute;inset:-20%;pointer-events:none;
  background-image:
    linear-gradient(rgba(255,255,255,.06) 1px,transparent 1px),
    linear-gradient(90deg,rgba(255,255,255,.06) 1px,transparent 1px);
  background-size:36px 36px,36px 36px;
  animation:bpDrift 26s linear infinite;
  opacity:.55;
}
.blueprint-bg::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:radial-gradient(circle at 18% 30%, rgba(245,196,66,.16), transparent 40%),
    radial-gradient(circle at 82% 70%, rgba(232,151,63,.14), transparent 42%);
}
.blueprint-bg .gear-decor{position:absolute;opacity:.16;color:#fff;pointer-events:none;animation:gearSpin 34s linear infinite,floaty 7s ease-in-out infinite}
.blueprint-bg .gear-decor.rev{animation:gearSpinRev 40s linear infinite,floaty 8s ease-in-out infinite}
.blueprint-bg .gear-decor.g1{top:-30px;inset-inline-end:6%;width:110px;height:110px}
.blueprint-bg .gear-decor.g2{bottom:-24px;inset-inline-start:8%;width:70px;height:70px;animation-delay:-4s}
.blueprint-bg .gear-decor.g3{top:38%;inset-inline-start:42%;width:46px;height:46px;opacity:.10}

/* ---------- نمط الفيزياء الهندسي (نفس التصميم المعتمد بصفحات وليد العامة) ---------- */
.physics-pattern{position:absolute;inset:-40px -20px auto -20px;width:calc(100% + 40px);height:620px;color:var(--navy-mid);opacity:.16;pointer-events:none;z-index:0}
.physics-pattern .pb-formula{pointer-events:auto}
.physics-pattern .pb-electron-orbit{transform-origin:0 0;animation:pbOrbit 5s linear infinite}
.physics-pattern .pb-atom{animation:pbFloat2 7s ease-in-out infinite}
.physics-pattern-compact .pb-atom{animation:pbFloat2Compact 7s ease-in-out infinite}
.physics-pattern .pb-wave{stroke-dasharray:14 10;animation:pbWave 3s linear infinite}
.physics-pattern .pb-triangle{stroke-dasharray:26 10;animation:pbDraw 6s linear infinite}
.physics-pattern .pb-circuit{stroke-dasharray:18 8;animation:pbDraw 9s linear infinite reverse}
.physics-pattern .pb-formula{animation:pbPulse 4.5s ease-in-out infinite;cursor:default;transform-origin:center;transition:transform .25s ease,opacity .25s ease}
.physics-pattern .pb-formula:hover{transform:scale(1.22);opacity:1!important;animation-play-state:paused}
.physics-pattern .pb-f1{animation-delay:0s}
.physics-pattern .pb-f2{animation-delay:.8s}
.physics-pattern .pb-f3{animation-delay:1.6s}
.physics-pattern .pb-f4{animation-delay:2.4s}
.hero-mega .physics-pattern{color:rgba(255,255,255,.7);opacity:.22}
.physics-pattern-compact{height:320px !important;opacity:.14}
@keyframes pbOrbit{from{transform:rotate(0deg)}to{transform:rotate(360deg)}}
@keyframes pbFloat2{0%,100%{transform:translate(1040px,180px) translateY(0)}50%{transform:translate(1040px,180px) translateY(-16px)}}
@keyframes pbFloat2Compact{0%,100%{transform:translate(800px,90px) translateY(0)}50%{transform:translate(800px,90px) translateY(-14px)}}
@keyframes pbWave{from{stroke-dashoffset:0}to{stroke-dashoffset:-120}}
@keyframes pbDraw{from{stroke-dashoffset:0}to{stroke-dashoffset:-180}}
@keyframes pbPulse{0%,100%{opacity:.55;transform:translateY(0)}50%{opacity:1;transform:translateY(-8px)}}
@media(max-width:800px){.physics-pattern{height:420px;opacity:.12}.physics-pattern-compact{height:220px !important;opacity:.09}}
@media(prefers-reduced-motion:reduce){.physics-pattern *{animation:none!important}}

/* ---------- Hero ---------- */
.hero{background:var(--grad-navy);color:#fff;padding:70px 0;position:relative;overflow:hidden}
.hero .container{position:relative;z-index:1}
.hero h1{font-size:clamp(26px,4vw,42px);font-weight:900;margin:0 0 14px;line-height:1.3}
.hero p{color:rgba(255,255,255,.8);font-size:15.5px;line-height:1.9;max-width:600px}

.hero-mega{background:var(--grad-mega);background-size:220% 220%;animation:megaShift 22s ease-in-out infinite;color:#fff;padding:86px 0 70px;position:relative;overflow:hidden}
.hero-pencil-canvas{position:absolute;inset:0;z-index:2;pointer-events:none}
.hero-mega::after{content:"";position:absolute;inset:0;background:linear-gradient(0deg,rgba(10,20,32,.35),transparent 55%);pointer-events:none}
.hero-mega .container{position:relative;z-index:1}
.hero-mega h1{font-size:clamp(28px,4.4vw,46px);font-weight:900;margin:0 0 14px;line-height:1.3;text-shadow:0 4px 24px rgba(0,0,0,.35)}
.hero-mega p{color:rgba(255,255,255,.88);font-size:16px;line-height:1.9;max-width:620px;text-shadow:0 2px 10px rgba(0,0,0,.3)}

.page-hero{background:var(--grad-navy);color:#fff;padding:40px 0;position:relative;overflow:hidden}
.page-hero .container{position:relative;z-index:1}
.page-hero h1{margin:0 0 6px;font-size:26px;font-weight:900}
.page-hero p{color:rgba(255,255,255,.75);margin:0;font-size:14px}
.crumbs{color:rgba(255,255,255,.6);font-size:12.5px;margin-top:10px}
.crumbs a{color:#fff}

/* ---------- ظهور تدريجي عند التمرير ---------- */
.reveal{opacity:0;transform:translateY(18px);transition:opacity .7s ease,transform .7s ease}
.reveal.in-view{opacity:1;transform:translateY(0)}

/* ---------- شعار 421 ---------- */
.logo-mark{display:block;flex:none}
@media (prefers-reduced-motion:reduce){
  .blueprint-bg::before,.hero-mega,.gear-decor{animation:none !important}
}

/* ---------- بطاقات ---------- */
.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:22px;box-shadow:var(--shadow-sm)}
.course-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:20px}
.course-grid .card{transition:transform .3s,box-shadow .3s}
.course-grid .card:hover{transform:translateY(-6px);box-shadow:var(--shadow)}
.course-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius-lg);overflow:hidden;box-shadow:var(--shadow-sm);transition:transform .25s,box-shadow .25s;width:270px;flex:none;scroll-snap-align:start;display:flex;flex-direction:column}
.course-card:hover{transform:translateY(-4px);box-shadow:var(--shadow)}

.lesson-row{display:flex;align-items:center;gap:14px;padding:16px;border:1px solid var(--line);border-radius:var(--radius);margin-bottom:10px;background:#fff}
.lesson-row.locked{opacity:.55}
.lesson-row .num{width:36px;height:36px;border-radius:50%;background:var(--bg);display:flex;align-items:center;justify-content:center;font-weight:900;color:var(--steel);flex:none}
.lesson-row.done .num{background:var(--success);color:#fff}
.lesson-row .info{flex:1}
.lesson-row h4{margin:0 0 3px;font-size:14px;font-weight:800}
.lesson-row .meta{font-size:12px;color:var(--muted)}

/* ---------- فورم ---------- */
.form-stack{display:flex;flex-direction:column;gap:14px}
.form-stack label{font-size:13px;font-weight:800;display:flex;flex-direction:column;gap:6px}
.form-stack input,.form-stack select,.form-stack textarea{border:1.5px solid var(--line);border-radius:10px;padding:11px 13px;font-size:14px;width:100%}
.form-stack input:focus,.form-stack select:focus,.form-stack textarea:focus{outline:2px solid var(--steel-light);outline-offset:1px}
.form-message{font-size:13px;font-weight:700;color:var(--danger);min-height:18px;margin:0}
.form-message.success{color:var(--success)}

/* ---------- الامتحان ---------- */

/* ---------- أيقونة نتيجة الامتحان — ترسم نفسها (✓ أو ✕) بدل ما تظهر فجأة ---------- */@keyframes qriMark{to{stroke-dashoffset:0}}@media(prefers-reduced-motion:reduce){
}

/* ---------- عرض الكورسات المتقلّب (كاروسيل قابل للسحب + بطاقات تنقلب) ---------- */
.course-showcase{padding:60px 0 20px}
.course-carousel{overflow-x:auto;overflow-y:hidden;position:relative;margin-top:30px;cursor:grab;scrollbar-width:none;-ms-overflow-style:none;-webkit-mask-image:linear-gradient(90deg,transparent,#000 4%,#000 96%,transparent);mask-image:linear-gradient(90deg,transparent,#000 4%,#000 96%,transparent)}
.course-carousel::-webkit-scrollbar{display:none}
.course-carousel:active{cursor:grabbing}
.course-carousel-track{display:flex;gap:22px;width:max-content;padding:6px 6px 18px}
/* ---------- كارت الكورس الثابت (بدون قلب) — بديل مستقر لتأثير القلب اللي كان يتكسر أثناء التمرير التلقائي ---------- */
.course-card-cover{height:150px;flex:none;background-size:cover;background-position:center;position:relative}
.course-card-cover-fallback{background:var(--grad-navy);overflow:hidden}
.course-card-cover-fallback .cover-gear{position:absolute;color:rgba(255,255,255,.14);animation:gearSpin 30s linear infinite}
.course-card-cover-fallback .cover-gear.g1{width:120px;height:120px;top:-30px;inset-inline-end:-24px}
.course-card-cover-fallback .cover-gear.g2{width:80px;height:80px;bottom:-24px;inset-inline-start:-16px;animation-name:gearSpinRev}
.course-card-cover-fallback .cover-initial{position:absolute;inset:0;display:grid;place-items:center;font-size:44px;font-weight:900;color:rgba(255,255,255,.8);font-family:var(--font-display)}
.course-card-body{padding:18px 20px 20px;display:flex;flex-direction:column;flex:1;min-height:0}
.course-card-badge{align-self:flex-start;background:rgba(245,196,66,.14);color:#a06e12;font-size:11px;font-weight:800;padding:5px 12px;border-radius:99px;margin-bottom:10px}
.course-card-body h3{margin:0 0 8px;font-size:17px;color:var(--ink)}
.course-card-body p{color:var(--muted);font-size:12.5px;line-height:1.8;flex:1;display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden;margin:0 0 14px}
.course-card-actions{display:flex;align-items:center;justify-content:space-between;gap:8px;margin-top:auto}
.course-card-hint{color:var(--muted)}
@media(prefers-reduced-motion:reduce){.course-card-cover-fallback .cover-gear{animation:none!important}}

/* ---------- معرض صور ونافذة فيديو (تظهر بنافذة التفاصيل) ---------- */
.course-video-frame{aspect-ratio:16/9;background:#000;border-radius:var(--radius) var(--radius) 0 0;overflow:hidden}
.course-video-frame iframe,.course-video-frame video{width:100%;height:100%;border:0;display:block}
.course-gallery{display:flex;gap:8px;overflow-x:auto;padding:12px 4px 0;scrollbar-width:thin}
.course-gallery-item{flex:none;width:120px;height:84px;border-radius:10px;background-size:cover;background-position:center;box-shadow:var(--shadow-sm)}
.course-details-box{padding-top:0;overflow:hidden;width:min(720px,94%)}
.course-details-box .course-card-cover{border-radius:0}

/* ---------- نافذة تفاصيل الكورس ---------- */
.modal-backdrop{position:fixed;inset:0;z-index:100;background:rgba(10,20,32,.55);backdrop-filter:blur(4px);display:flex;align-items:center;justify-content:center;padding:20px;opacity:0;pointer-events:none;transition:opacity .2s}
.modal-backdrop.open{opacity:1;pointer-events:auto}
.modal-box{position:relative;width:min(560px,100%);max-height:88vh;overflow:auto;background:#fff;border-radius:var(--radius-lg);box-shadow:0 30px 80px rgba(0,0,0,.35);transform:translateY(14px);transition:transform .25s}
.modal-backdrop.open .modal-box{transform:translateY(0)}
.modal-close{position:absolute;top:10px;inset-inline-end:14px;background:rgba(255,255,255,.9);border:0;font-size:24px;line-height:1;color:var(--ink);cursor:pointer;width:34px;height:34px;border-radius:50%;z-index:2}
.details-lesson-list{margin:0;padding-inline-start:20px;font-size:13.5px;line-height:2.1;color:var(--ink)}

/* ---------- واجب الأوتوكاد (DWG) ---------- */
.assignment-card{border-top:4px solid var(--steel-light)}
.assignment-card.is-approved{border-top-color:var(--success)}
.assignment-card.is-rejected{border-top-color:var(--danger)}
.status-badge{display:inline-flex;align-items:center;gap:6px;font-size:12.5px;font-weight:800;padding:6px 12px;border-radius:99px}
.status-badge.status-todo{background:rgba(30,78,120,.1);color:var(--steel)}
.status-badge.status-pending{background:rgba(245,196,66,.18);color:#a06e12}
.status-badge.status-approved{background:rgba(31,157,85,.14);color:var(--success)}
.status-badge.status-rejected{background:rgba(216,67,67,.12);color:var(--danger)}
.dwg-drop{border:2px dashed var(--line);border-radius:var(--radius);padding:28px 18px;text-align:center;cursor:pointer;transition:border-color .2s,background .2s,transform .2s;background:linear-gradient(180deg,#fbfcfd,#f4f6f8);position:relative;overflow:hidden}
.dwg-drop:hover{border-color:var(--steel-light);transform:translateY(-2px)}
.dwg-drop.drag{border-color:var(--amber);background:rgba(245,196,66,.08);transform:scale(1.01)}
.dwg-drop.is-retry{border-color:var(--danger)}
.dwg-drop-icon{font-size:32px;margin-bottom:8px;position:relative;z-index:1}
.dwg-drop-title{font-weight:800;font-size:14.5px;position:relative;z-index:1}
.dwg-drop-hint{color:var(--muted);font-size:12px;margin-top:6px;position:relative;z-index:1}
/* شبكة "snap" تقنية تبين لما تسحب ملف فوق الصندوق — نفس إحساس برامج الأوتوكاد */
.dwg-drop::before{
  content:"";position:absolute;inset:0;pointer-events:none;opacity:0;transition:opacity .2s;
  background-image:linear-gradient(rgba(232,151,63,.35) 1px,transparent 1px),linear-gradient(90deg,rgba(232,151,63,.35) 1px,transparent 1px);
  background-size:16px 16px;background-position:center;
}
.dwg-drop.drag::before{opacity:1;animation:dwgGridPulse .9s ease-in-out infinite}
.dwg-drop::after{
  content:"";position:absolute;width:22px;height:22px;top:50%;inset-inline-start:50%;margin:-11px 0 0 -11px;pointer-events:none;opacity:0;
  border:2px solid var(--amber);border-radius:2px;transition:opacity .2s;
}
.dwg-drop.drag::after{opacity:.9;animation:dwgCrosshair 1.4s ease-in-out infinite}
@keyframes dwgGridPulse{0%,100%{opacity:.55}50%{opacity:1}}
@keyframes dwgCrosshair{0%,100%{transform:scale(1) rotate(0deg)}50%{transform:scale(1.35) rotate(45deg)}}
@media(prefers-reduced-motion:reduce){ .dwg-drop.drag::before,.dwg-drop.drag::after{animation:none!important} }
.file-chip{display:inline-flex;align-items:center;gap:8px;background:#fff;border:1px solid var(--line);border-radius:10px;padding:8px 14px;font-size:13px;font-weight:700}
.reject-note{background:rgba(216,67,67,.07);border:1px solid rgba(216,67,67,.25);border-radius:12px;padding:14px 16px;margin:10px 0 18px;font-size:13.5px;line-height:1.9;color:#7a1f1f}

/* ---------- بروفايل / QR ---------- */
.qr-box{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:24px;text-align:center}
.qr-box canvas, .qr-box img{margin:0 auto}

/* ---------- فوتر ---------- */
.site-footer{background:var(--navy);color:rgba(255,255,255,.7);padding:40px 0 20px;margin-top:60px}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr;gap:24px;margin-bottom:24px}
@media(max-width:700px){.footer-grid{grid-template-columns:1fr}}
.footer-grid h5{color:#fff;font-size:14px;margin:0 0 12px}
.footer-grid a{display:block;color:rgba(255,255,255,.65);font-size:13px;padding:4px 0}
.footer-bottom{border-top:1px solid rgba(255,255,255,.12);padding-top:16px;display:flex;justify-content:space-between;flex-wrap:wrap;gap:8px;font-size:12px;color:rgba(255,255,255,.5)}

/* ---------- عام ---------- */
.stat-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:14px}
.stat-tile{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:16px;text-align:center}
.stat-tile b{display:block;font-size:24px;font-weight:900;color:var(--steel)}
.stat-tile span{font-size:12px;color:var(--muted)}
table{width:100%;border-collapse:collapse}
th,td{padding:10px 12px;text-align:start;border-bottom:1px solid var(--line);font-size:13px}
th{color:var(--muted);font-weight:800;font-size:12px}
.skel{background:linear-gradient(90deg,#eef1f4 25%,#e3e8ec 37%,#eef1f4 63%);background-size:400% 100%;animation:skel 1.4s ease infinite;border-radius:var(--radius);position:relative;overflow:hidden;min-height:36px}
@keyframes skel{0%{background-position:100% 50%}100%{background-position:0 50%}}
.skel::after{content:"LOADING…";position:absolute;bottom:10px;inset-inline-start:14px;font-family:var(--mono);font-size:10px;letter-spacing:.12em;color:var(--steel);opacity:.45;animation:skelBlink 1.1s steps(1) infinite}
@keyframes skelBlink{0%,49%{opacity:.45}50%,100%{opacity:.12}}
.empty-card{color:var(--muted)}

/* ===================== مخطط "تجميع" — صفحة عن المنصة ===================== */
/* 4 قطع تبدأ متفرقة/مائلة (متل مخطط هندسي منفكّك) وتتجمّع بمكانها الطبيعي
   لما تدخل الشاشة — كل قطعة تمثّل محطة حقيقية بمسار الطالب بالمنصة. */
.assembly{margin:10px 0 44px}
.assembly-stack{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
@media(max-width:760px){.assembly-stack{grid-template-columns:repeat(2,1fr)}}
.assembly-plate{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:20px 16px;text-align:center;box-shadow:var(--shadow-sm);
  opacity:0;transition:transform .8s cubic-bezier(.16,1,.3,1),opacity .8s ease;will-change:transform,opacity}
.assembly-plate .ap-icon{width:46px;height:46px;margin:0 auto 12px;border-radius:12px;background:rgba(232,151,63,.12);display:flex;align-items:center;justify-content:center;font-size:20px;color:var(--amber);border:1px solid rgba(232,151,63,.3)}
.assembly-plate h4{margin:0 0 6px;font-size:14px}
.assembly-plate p{margin:0;font-size:12px;color:var(--muted);line-height:1.7}
.assembly-plate.ap-1{transform:translate(-70px,-50px) rotate(-16deg) scale(.92)}
.assembly-plate.ap-2{transform:translate(46px,-90px) rotate(11deg) scale(.92)}
.assembly-plate.ap-3{transform:translate(-46px,70px) rotate(9deg) scale(.92)}
.assembly-plate.ap-4{transform:translate(70px,60px) rotate(-13deg) scale(.92)}
.assembly.assembled .assembly-plate{opacity:1;transform:translate(0,0) rotate(0) scale(1)}
.assembly.assembled .ap-2{transition-delay:.08s}
.assembly.assembled .ap-3{transition-delay:.16s}
.assembly.assembled .ap-4{transition-delay:.24s}
@media(prefers-reduced-motion:reduce){
  .assembly-plate{transition:opacity .4s ease!important;transform:none!important;opacity:0}
  .assembly.assembled .assembly-plate{opacity:1}
}

/* ===================== طبقة تفاعل هندسية إضافية ===================== */

/* ---------- مسطرة القياس الجانبية — مؤشر تقدّم القراءة بشكل "مسطرة رسم هندسي" ---------- */
.ruler-rail{position:fixed;top:0;bottom:0;inset-inline-start:0;width:26px;z-index:55;pointer-events:none;display:none}
@media(min-width:1180px){ .ruler-rail{display:block} }
.ruler-rail::before{content:"";position:absolute;top:0;bottom:0;inset-inline-start:12px;width:1px;background:linear-gradient(180deg,transparent,rgba(23,58,92,.16) 6%,rgba(23,58,92,.16) 94%,transparent)}
.ruler-rail .rr-ticks{position:absolute;inset:0}
.ruler-rail .rr-tick{position:absolute;inset-inline-start:8px;width:9px;height:1px;background:rgba(23,58,92,.22)}
.ruler-rail .rr-tick.major{width:15px;background:rgba(23,58,92,.38)}
.ruler-rail .rr-tick .rr-label{position:absolute;inset-inline-start:18px;top:-6px;font-family:var(--mono);font-size:9px;color:var(--muted);letter-spacing:.02em;white-space:nowrap}
.ruler-rail .rr-cursor{position:absolute;inset-inline-start:2px;width:22px;height:22px;margin-top:-11px;transition:top .06s linear}
.ruler-rail .rr-cursor svg{width:100%;height:100%;color:var(--amber)}
.ruler-rail .rr-fill{position:absolute;top:0;inset-inline-start:12px;width:1px;background:linear-gradient(180deg,var(--gold),var(--amber));box-shadow:0 0 8px rgba(232,151,63,.5)}

/* ---------- أزرار مغناطيسية — تنجذب بلطف نحو المؤشر ---------- */
.btn{will-change:transform}
.btn.magnetic{transition:transform .15s cubic-bezier(.2,.8,.2,1),box-shadow .2s,opacity .2s}

/* ---------- بطاقات بميلان ثلاثي الأبعاد عند تمرير المؤشر ---------- */
.tilt-card{transform-style:preserve-3d;transition:transform .35s cubic-bezier(.2,.8,.2,1)}
.tilt-card[data-tilting]{transition:transform .05s linear}
.tilt-card .tilt-shine{position:absolute;inset:0;pointer-events:none;opacity:0;transition:opacity .3s;background:radial-gradient(circle at var(--mx,50%) var(--my,50%),rgba(255,255,255,.35),transparent 45%);border-radius:inherit;z-index:2}
.tilt-card:hover .tilt-shine{opacity:1}

/* ---------- دخول العناصر عند تحميل الصفحة (Hero) ---------- */
.enter{opacity:0;transform:translateY(22px);animation:enterUp .8s cubic-bezier(.16,1,.3,1) forwards;animation-play-state:paused}
.enter.go{animation-play-state:running}
@keyframes enterUp{to{opacity:1;transform:translateY(0)}}
@media(prefers-reduced-motion:reduce){ .enter{animation:none!important;opacity:1;transform:none} }

/* ---------- مخطط مسار العمل (Pipeline) — خط اتصال هندسي يُرسم بين الخطوات ---------- */
.pipeline{position:relative;margin-top:10px}
.pipeline-svg{position:absolute;top:34px;inset-inline-start:0;width:100%;height:3px;pointer-events:none;overflow:visible;display:none}
@media(min-width:860px){ .pipeline-svg{display:block} }
.pipeline-svg path{fill:none;stroke:var(--amber);stroke-width:2;stroke-dasharray:6 8;stroke-linecap:round;opacity:.5}
.pipeline-svg path.drawn{stroke-dasharray:1400;stroke-dashoffset:1400;opacity:1;animation:pipelineDraw 1.6s ease forwards}
@keyframes pipelineDraw{to{stroke-dashoffset:0}}
.pipeline-step{position:relative;z-index:1}
.pipeline-step .step-tag{font-family:var(--mono);font-size:11px;font-weight:700;color:var(--amber);letter-spacing:.06em;display:inline-flex;align-items:center;gap:6px;margin-bottom:10px}
.pipeline-step .step-tag::before{content:"";width:6px;height:6px;border-radius:50%;background:var(--amber);box-shadow:0 0 0 3px rgba(232,151,63,.18)}
.pipeline-step .step-num{position:absolute;top:-14px;inset-inline-end:-10px;font-family:var(--mono);font-size:34px;font-weight:700;color:rgba(23,58,92,.08);z-index:-1;line-height:1}

/* ---------- تسميات/شارات بطابع مخطط هندسي (Datasheet) ---------- */
.spec-label{font-family:var(--mono);font-size:10.5px;letter-spacing:.08em;text-transform:uppercase;color:var(--steel);opacity:.75}
.corner-frame{position:relative}
.corner-frame::before,.corner-frame::after{content:"";position:absolute;width:14px;height:14px;border:2px solid rgba(245,196,66,.55);opacity:0;transition:opacity .3s}
.corner-frame::before{top:-6px;inset-inline-start:-6px;border-inline-end:0;border-bottom:0}
.corner-frame::after{bottom:-6px;inset-inline-end:-6px;border-inline-start:0;border-top:0}
.corner-frame:hover::before,.corner-frame:hover::after{opacity:1}

@media(prefers-reduced-motion:reduce){
  .tilt-card,.btn.magnetic{transition:none!important}
  .pipeline-svg path.drawn{animation:none!important;stroke-dashoffset:0}
}

/* ---------- صندوق فيديو الدرس + العلامة المائية المتحركة (كود الطالب) ---------- */
.video-wrap{position:relative;aspect-ratio:16/9;background:#000;border-radius:var(--radius-lg);overflow:hidden;box-shadow:var(--shadow);margin-top:14px}
.video-wrap iframe,.video-wrap video{width:100%;height:100%;border:0;display:block}
.lesson-watermark{
  position:absolute;pointer-events:none;user-select:none;z-index:5;
  font-family:var(--mono);font-size:13px;font-weight:700;letter-spacing:.04em;
  color:rgba(255,255,255,.5);text-shadow:0 1px 2px rgba(0,0,0,.9),0 0 6px rgba(0,0,0,.5);
  transition:top 1.1s ease,left 1.1s ease;white-space:nowrap;
}
@media(prefers-reduced-motion:reduce){ .lesson-watermark{transition:none!important} }

/* ---------- انتقال ناعم بين الصفحات (View Transitions API) — يشتغل تلقائيًا
   بالمتصفحات الحديثة (Chrome/Edge) وينتقل بهدوء بأي متصفح ما يدعمها ---------- */
@view-transition{ navigation: auto; }
@media(prefers-reduced-motion:no-preference){
  ::view-transition-old(root){ animation: pageFadeOut .18s ease forwards; }
  ::view-transition-new(root){ animation: pageFadeIn .22s ease backwards; }
}
@keyframes pageFadeOut{to{opacity:0;transform:translateY(-6px)}}
@keyframes pageFadeIn{from{opacity:0;transform:translateY(6px)}}

/* ===================== صفحات الدخول/التسجيل — تخطيط بعمودين بهوية هندسية ===================== */
.auth-shell{padding:44px 0 70px}
.auth-grid{display:grid;grid-template-columns:1fr 1.15fr;gap:0;border-radius:var(--radius-lg);overflow:hidden;box-shadow:var(--shadow);background:#fff}
@media(max-width:860px){ .auth-grid{grid-template-columns:1fr} }

.auth-side{background:var(--grad-navy);color:#fff;padding:44px 38px;position:relative;overflow:hidden;display:flex;flex-direction:column;min-height:100%}
.auth-side .auth-side-top{position:relative;z-index:1}
.auth-side .auth-logo{margin-bottom:34px}
.auth-side h2{font-size:22px;font-weight:900;margin:0 0 10px;line-height:1.5}
.auth-side p{color:rgba(255,255,255,.72);font-size:13.5px;line-height:1.9;margin:0 0 30px;max-width:340px}
.auth-feature-list{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:16px;position:relative;z-index:1}
.auth-feature-list li{display:flex;align-items:flex-start;gap:12px;font-size:13px;color:rgba(255,255,255,.85);line-height:1.7}
.auth-feature-list .af-ico{flex:none;width:30px;height:30px;border-radius:9px;background:rgba(245,196,66,.16);border:1px solid rgba(245,196,66,.3);display:flex;align-items:center;justify-content:center;font-size:14px}
.auth-side-foot{margin-top:auto;padding-top:30px;position:relative;z-index:1;font-family:var(--mono);font-size:10.5px;letter-spacing:.06em;color:rgba(255,255,255,.4);display:flex;justify-content:space-between}
@media(max-width:860px){ .auth-side{min-height:0;padding:34px 26px} .auth-side-foot{display:none} }

.auth-card{padding:44px 40px;display:flex;flex-direction:column;justify-content:center}
@media(max-width:860px){ .auth-card{padding:32px 22px} }
.auth-card-head{margin-bottom:26px}
.auth-card-head h1{font-size:22px;font-weight:900;margin:8px 0 6px}
.auth-card-head p{color:var(--muted);font-size:13px;margin:0}

/* ---------- سجل محاولات الامتحان ---------- */
.attempt-log{margin-top:12px;border-top:1px solid rgba(30,78,120,.14);padding-top:10px}
.attempt-row{display:flex;align-items:center;gap:10px;flex-wrap:wrap;padding:9px 0;border-bottom:1px dashed rgba(30,78,120,.14)}
.attempt-row:last-child{border-bottom:0}
.attempt-row > b{font-size:13px;color:var(--steel);flex:none}
.attempt-note{flex-basis:100%;font-size:12.5px;line-height:1.8;color:var(--danger);background:rgba(216,67,67,.06);border-inline-start:3px solid var(--danger);padding:7px 10px;border-radius:0 6px 6px 0;margin-top:4px}

/* ---------- مشغّل محمي بشريط تحكم كامل ---------- */
.player-shell{margin-top:14px;border-radius:var(--radius-lg);overflow:hidden;box-shadow:var(--shadow);background:#000}
.player-shell .video-wrap{margin-top:0;border-radius:0;box-shadow:none}
.secure-player{position:relative}
.secure-player #ytHost,.secure-player iframe{width:100%;height:100%;border:0;display:block;pointer-events:none}
/* الطبقة تمنع الوصول لواجهة يوتيوب، بس نقراتها تشتغل تشغيل/إيقاف */
.video-shield{position:absolute;inset:0;z-index:3;cursor:pointer;background:transparent}

.center-play{position:absolute;z-index:4;top:50%;left:50%;transform:translate(-50%,-50%);
  width:74px;height:74px;border-radius:50%;background:rgba(0,0,0,.55);color:#fff;
  display:flex;align-items:center;justify-content:center;font-size:26px;pointer-events:none;
  transition:opacity .25s ease,transform .25s ease;backdrop-filter:blur(2px)}
.player-shell.is-playing .center-play{opacity:0;transform:translate(-50%,-50%) scale(.7)}

.player-bar{background:#14181d;padding:10px 14px 12px;color:#fff}

/* الشريط مثبّت LTR: البداية دائمًا يسار مثل أي مشغّل، حتى بصفحة عربية */
.pb-seek{direction:ltr;position:relative;height:22px;display:flex;align-items:center;cursor:pointer;touch-action:none}
.pb-seek:focus-visible{outline:2px solid var(--amber,#E8973F);outline-offset:3px;border-radius:4px}
.pb-rail{position:relative;width:100%;height:6px;background:rgba(255,255,255,.22);border-radius:99px;overflow:hidden}
.pb-buf{position:absolute;inset-block:0;left:0;background:rgba(255,255,255,.3);width:0}
.pb-fill{position:absolute;inset-block:0;left:0;background:var(--amber,#E8973F);width:0;border-radius:99px}
.pb-knob{position:absolute;top:50%;left:0;width:14px;height:14px;margin-left:-7px;border-radius:50%;
  background:#fff;box-shadow:0 1px 4px rgba(0,0,0,.5);transform:translateY(-50%);pointer-events:none;
  opacity:0;transition:opacity .15s ease}
.pb-seek:hover .pb-knob,.pb-seek:focus-visible .pb-knob,.player-shell.is-playing .pb-knob{opacity:1}

.pb-row{display:flex;align-items:center;gap:8px;margin-top:6px;flex-wrap:wrap}
.pb-spacer{flex:1}
.pb-btn{flex:none;min-width:36px;height:34px;padding:0 9px;border:0;border-radius:8px;
  background:rgba(255,255,255,.1);color:#fff;font:inherit;font-size:13px;font-weight:700;
  cursor:pointer;display:flex;align-items:center;justify-content:center;transition:background .15s ease}
.pb-btn:hover{background:rgba(255,255,255,.22)}
.pb-btn.primary{background:var(--grad-amber);min-width:40px}
.pb-time{flex:none;font-size:12.5px;color:rgba(255,255,255,.75);font-variant-numeric:tabular-nums;padding:0 4px}
.pb-vol{flex:none;width:78px;accent-color:var(--amber,#E8973F);cursor:pointer}

/* ملء الشاشة: الفيديو ياخذ المساحة والشريط يبقى تحت */
.player-shell.is-fullscreen{display:flex;flex-direction:column;width:100%;height:100%;background:#000;border-radius:0}
.player-shell.is-fullscreen .video-wrap{flex:1;aspect-ratio:auto;min-height:0}
.player-shell.is-fullscreen .player-bar{flex:none}
.player-shell:fullscreen{display:flex;flex-direction:column;width:100%;height:100%}
.player-shell:fullscreen .video-wrap{flex:1;aspect-ratio:auto;min-height:0}

@media(max-width:520px){
  .pb-vol{display:none}
  .pb-time{width:100%;order:9;text-align:center;padding-top:2px}
}

/* ---------- عدّاد إنجاز المحاضرة ---------- */
.watch-meter{display:flex;align-items:center;gap:16px;margin-top:20px;padding:16px 18px;background:#fff;border:1.5px solid var(--line);border-radius:var(--radius)}
.watch-ring{flex:none;width:74px;height:74px;border-radius:50%;display:flex;align-items:center;justify-content:center;
  background:conic-gradient(var(--amber,#E8973F) calc(var(--pct,0)*1%),rgba(30,78,120,.12) 0);position:relative}
.watch-ring::after{content:"";position:absolute;inset:7px;background:#fff;border-radius:50%}
.watch-ring[data-done="1"]{background:conic-gradient(var(--success,#1F9D55) calc(var(--pct,0)*1%),rgba(30,78,120,.12) 0)}
.watch-ring span{position:relative;z-index:1;font-weight:900;font-size:16px;color:var(--navy)}
.watch-meter-text b{display:block;margin-bottom:4px;color:var(--navy)}
.watch-meter-text p{margin:0;font-size:13px;line-height:1.8}

/* ---------- قفل رفع الملف ---------- */
.watch-gate-note{padding:16px 18px;border:1.5px dashed rgba(30,78,120,.28);border-radius:var(--radius);background:rgba(30,78,120,.03);text-align:center}
.watch-gate-note b{display:block;margin-bottom:6px;color:var(--steel)}
.watch-gate-note p{margin:0 0 10px;font-size:13px;line-height:1.8;color:var(--muted)}
.gate-bar{height:8px;background:rgba(30,78,120,.12);border-radius:99px;overflow:hidden}
.gate-bar i{display:block;height:100%;background:var(--grad-amber);border-radius:99px}

/* ---------- زر إظهار كلمة المرور ---------- */
.pw-field{position:relative;display:block}
.pw-field > input{display:block}
.pw-field input{width:100%;padding-inline-end:44px}
.pw-eye{position:absolute;inset-inline-end:6px;top:50%;transform:translateY(-50%);
  width:32px;height:32px;border:0;border-radius:8px;background:transparent;cursor:pointer;
  font-size:16px;line-height:1;display:flex;align-items:center;justify-content:center;
  opacity:.6;transition:opacity .15s ease,background .15s ease}
.pw-eye:hover{opacity:1;background:rgba(30,78,120,.08)}
.pw-eye:focus-visible{outline:2px solid var(--amber,#E8973F);outline-offset:2px;opacity:1}
/* الزر يُوضع نسبةً للحقل نفسه، مو للغلاف — لأن الغلاف ممكن يضم
   شريط قوة كلمة المرور تحت الحقل فينزاح المركز. */
.pw-field{display:flex;flex-direction:column}
.pw-eye{top:0;height:100%;transform:none;max-height:46px}