:root{
  --primary:#0ea5a3; --primary-dark:#0b7d7b; --accent:#f59e0b;
  --bg:#f5f7fa; --surface:#ffffff; --surface-2:#eef2f6;
  --text:#13233a; --muted:#64748b; --border:#e2e8f0;
  --wood:#7c4a23; --wood-dark:#5c3417; --bead:#d97706; --bead-on:#b45309;
  --ok:#16a34a; --bad:#dc2626;
  --radius:16px; --shadow:0 10px 30px rgba(15,30,55,.08); --shadow-lg:0 20px 50px rgba(15,30,55,.14);
  --maxw:1140px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:'Tajawal',system-ui,'Segoe UI',sans-serif;
  background:var(--bg);color:var(--text);line-height:1.7;
  -webkit-font-smoothing:antialiased;
}
a{color:inherit;text-decoration:none}
ul{list-style:none}
img{max-width:100%}
.container{max-width:var(--maxw);margin:0 auto;padding:0 20px}
.narrow{max-width:760px}
.center{text-align:center}
.muted{color:var(--muted)}
.hidden{display:none !important}

/* ===== الأزرار ===== */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  font-family:inherit;font-weight:700;font-size:1rem;cursor:pointer;
  padding:12px 24px;border-radius:999px;border:2px solid transparent;transition:.2s;
}
.btn-lg{padding:15px 36px;font-size:1.1rem}
.btn-primary{background:var(--primary);color:#fff}
.btn-primary:hover{background:var(--primary-dark);transform:translateY(-2px);box-shadow:var(--shadow)}
.btn-ghost{background:transparent;color:var(--primary);border-color:var(--primary)}
.btn-ghost:hover{background:rgba(14,165,163,.08)}
.btn-link{background:none;border:none;color:var(--muted);text-decoration:underline;cursor:pointer;font-family:inherit;font-size:.95rem;padding:8px}
.btn:disabled{opacity:.45;cursor:not-allowed;transform:none;box-shadow:none}

/* ===== الترويسة ===== */
.site-header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.92);backdrop-filter:blur(10px);border-bottom:1px solid var(--border)}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:68px}
.brand{display:flex;align-items:center;gap:10px;font-weight:800;font-size:1.35rem;color:var(--primary-dark)}
.brand-icon{font-size:1.6rem}
.main-nav{display:flex;align-items:center;gap:6px}
.main-nav>a,.nav-drop-btn{
  padding:10px 16px;border-radius:10px;font-weight:600;color:var(--text);
  background:none;border:none;font-family:inherit;font-size:1rem;cursor:pointer;
}
.main-nav>a:hover,.nav-drop-btn:hover{background:var(--surface-2)}
.main-nav .active{color:var(--primary);background:rgba(14,165,163,.10)}
.nav-dropdown{position:relative}
.nav-drop-menu{
  position:absolute;top:100%;inset-inline-end:0;min-width:230px;background:#fff;
  border:1px solid var(--border);border-radius:14px;box-shadow:var(--shadow-lg);
  padding:8px;display:none;flex-direction:column;gap:2px;margin-top:8px;
}
.nav-dropdown:hover .nav-drop-menu,.nav-dropdown.open .nav-drop-menu{display:flex}
.nav-drop-menu a{padding:10px 14px;border-radius:10px;display:flex;gap:10px;align-items:center}
.nav-drop-menu a:hover{background:var(--surface-2)}
.nav-drop-menu .ico{font-size:1.15rem}
.nav-toggle{display:none;flex-direction:column;gap:5px;background:none;border:none;cursor:pointer;padding:8px}
.nav-toggle span{width:26px;height:3px;background:var(--text);border-radius:3px;transition:.25s}
.nav-toggle.x span:nth-child(1){transform:translateY(8px) rotate(45deg)}
.nav-toggle.x span:nth-child(2){opacity:0}
.nav-toggle.x span:nth-child(3){transform:translateY(-8px) rotate(-45deg)}

/* ===== Hero ===== */
.hero{background:linear-gradient(160deg,#e6fffb 0%,#f5f7fa 55%);padding:60px 0 70px;overflow:hidden}
.hero-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:40px;align-items:center}
.hero-text h1{font-size:2.8rem;font-weight:800;line-height:1.25;margin-bottom:18px}
.hero-text .hl{color:var(--primary);position:relative}
.lead{font-size:1.2rem;color:var(--muted);margin-bottom:26px}
.hero-actions{display:flex;gap:14px;flex-wrap:wrap;margin-bottom:30px}
.hero-stats{display:flex;gap:30px}
.hero-stats div{display:flex;flex-direction:column}
.hero-stats strong{font-size:1.8rem;color:var(--primary-dark)}
.hero-stats span{color:var(--muted);font-size:.9rem}
.hero-abacus{display:flex;flex-direction:column;align-items:center;gap:14px}
.hero-abacus-hint{color:var(--muted);font-weight:600}

/* ===== الأقسام ===== */
.section{padding:64px 0}
.section-alt{background:var(--surface-2)}
.section-title{font-size:2rem;font-weight:800;text-align:center;margin-bottom:6px}
.section-title.sm{font-size:1.5rem;text-align:start;margin:30px 0 14px}
.section-sub{text-align:center;color:var(--muted);margin-bottom:36px}

/* البطاقات */
.cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:22px}
.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:28px 24px;transition:.25s;box-shadow:var(--shadow)}
.op-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-lg);border-color:var(--primary)}
.card-icon{font-size:2.6rem;margin-bottom:12px}
.op-card h3{font-size:1.35rem;margin-bottom:8px}
.op-card p{color:var(--muted);font-size:.97rem;margin-bottom:14px}
.card-link{color:var(--primary);font-weight:700}

/* المزايا */
.features{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:22px}
.feature{background:var(--surface);border-radius:var(--radius);padding:26px;text-align:center;box-shadow:var(--shadow)}
.feature-ico{font-size:2.4rem;margin-bottom:10px}
.feature h3{margin-bottom:8px}
.feature p{color:var(--muted);font-size:.95rem}

/* CTA */
.cta{background:linear-gradient(135deg,var(--primary),var(--primary-dark));color:#fff;padding:60px 0}
.cta-inner{text-align:center}
.cta h2{font-size:2rem;margin-bottom:10px}
.cta p{opacity:.92;margin-bottom:24px;font-size:1.1rem}
.cta .btn-primary{background:#fff;color:var(--primary-dark)}
.cta .btn-primary:hover{background:#f0fdfa}

/* ===== صفحة الدرس ===== */
.lesson-hero{background:linear-gradient(160deg,#e6fffb,#f5f7fa);padding:40px 0 28px;border-bottom:1px solid var(--border)}
.breadcrumb{color:var(--muted);font-size:.9rem;margin-bottom:10px}
.breadcrumb a{color:var(--primary)}
.lesson-hero h1{font-size:2.2rem;display:flex;align-items:center;gap:12px}
.lesson-ico{font-size:2rem}
.lesson-grid{display:grid;grid-template-columns:1.3fr .9fr;gap:36px;align-items:start}
.lesson-intro{font-size:1.08rem;background:var(--surface);padding:20px 24px;border-radius:14px;border:1px solid var(--border);box-shadow:var(--shadow)}
.lesson-intro ul{list-style:disc;padding-inline-start:22px;margin-top:10px}
.lesson-intro li{margin-bottom:6px}
.concept{background:var(--surface);border:1px solid var(--border);border-radius:14px;padding:18px 20px;margin-bottom:14px}
.concept h3{display:flex;align-items:center;gap:10px;font-size:1.15rem;margin-bottom:6px}
.concept-num{display:inline-flex;align-items:center;justify-content:center;width:30px;height:30px;border-radius:50%;background:var(--primary);color:#fff;font-size:.95rem;flex:none}
.example-tabs{display:flex;flex-wrap:wrap;gap:10px;margin-top:8px}
.ex-tab{font-family:inherit;font-weight:700;cursor:pointer;padding:10px 16px;border-radius:999px;border:2px solid var(--border);background:#fff;color:var(--text);transition:.2s}
.ex-tab:hover{border-color:var(--primary)}
.ex-tab.active{background:var(--primary);color:#fff;border-color:var(--primary)}

/* لوحة العرض */
.lesson-aside{position:sticky;top:88px}
.demo-panel{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:22px;box-shadow:var(--shadow);text-align:center}
.demo-note{min-height:60px;background:var(--surface-2);border-radius:12px;padding:12px 14px;margin:16px 0;font-weight:600;display:flex;align-items:center;justify-content:center}
.demo-controls{display:flex;align-items:center;justify-content:center;gap:14px}
.demo-progress{font-weight:700;color:var(--muted);min-width:60px}
.try-box{margin-top:16px;text-align:center;color:var(--muted)}

/* مُتنقّل الدروس */
.lesson-pager{display:flex;justify-content:space-between;align-items:center;gap:14px;padding-bottom:50px;flex-wrap:wrap}
.pager-btn{padding:12px 20px;border-radius:12px;background:var(--surface);border:1px solid var(--border);font-weight:700;transition:.2s}
.pager-btn:hover{border-color:var(--primary);color:var(--primary)}
.pager-btn.primary{background:var(--accent);color:#fff;border-color:var(--accent)}
.pager-btn.primary:hover{filter:brightness(.95);color:#fff}

/* ===== الاختبار ===== */
.card-box{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:30px;box-shadow:var(--shadow);max-width:760px;margin:0 auto}
.setup-group{margin-bottom:22px}
.setup-group>label{display:block;font-weight:700;margin-bottom:10px}
.chip-row{display:flex;flex-wrap:wrap;gap:10px}
.chip{font-family:inherit;font-weight:700;cursor:pointer;padding:10px 18px;border-radius:999px;border:2px solid var(--border);background:#fff;color:var(--text);transition:.2s}
.chip:hover{border-color:var(--primary)}
.chip.active{background:var(--primary);color:#fff;border-color:var(--primary)}
.switch{display:flex;align-items:center;gap:10px;cursor:pointer;font-weight:600}
.switch input{width:20px;height:20px;accent-color:var(--primary)}
.best-scores{margin-top:18px}
.best-pill{display:inline-block;background:var(--surface-2);padding:8px 16px;border-radius:999px;font-weight:600}

.quiz-top{margin-bottom:20px}
.quiz-meta{display:flex;justify-content:space-between;font-weight:700;color:var(--muted);margin-bottom:8px}
.quiz-bar{height:10px;background:var(--surface-2);border-radius:999px;overflow:hidden}
.quiz-bar-fill{height:100%;width:0;background:linear-gradient(90deg,var(--primary),var(--accent));transition:width .3s}
.question{display:flex;align-items:center;justify-content:center;gap:14px;font-size:2.6rem;font-weight:800;padding:24px 0;letter-spacing:1px}
.q-op{color:var(--primary)}
.q-eq{color:var(--muted)}
.q-ans{color:var(--accent)}
.answer-form{display:flex;gap:12px;justify-content:center;max-width:420px;margin:0 auto}
.answer-form input{flex:1;font-family:inherit;font-size:1.4rem;font-weight:700;text-align:center;padding:12px 16px;border:2px solid var(--border);border-radius:12px;outline:none}
.answer-form input:focus{border-color:var(--primary)}
.answer-feedback{text-align:center;font-weight:700;min-height:28px;margin:14px 0;font-size:1.1rem}
.answer-feedback.ok{color:var(--ok)}
.answer-feedback.bad{color:var(--bad)}
.quiz-abacus{display:flex;justify-content:center;margin-top:10px}
.quiz-run .btn-link{display:block;margin:10px auto 0}

/* النتيجة */
.quiz-result{text-align:center}
.result-emoji{font-size:4rem}
.quiz-result h2{font-size:1.8rem;margin:6px 0 16px}
.result-score{font-size:2.6rem;font-weight:800;color:var(--primary)}
.result-stats{display:flex;justify-content:center;gap:34px;margin:22px 0}
.result-stats div{display:flex;flex-direction:column}
.result-stats strong{font-size:1.5rem}
.result-stats span{color:var(--muted);font-size:.9rem}
.result-review{text-align:start;margin:24px auto;max-width:520px}
.result-review h3{margin-bottom:12px}
.review-list li{padding:8px 12px;border-radius:10px;margin-bottom:6px;font-weight:600}
.review-list li.ok{background:rgba(22,163,74,.10);color:var(--ok)}
.review-list li.bad{background:rgba(220,38,38,.08);color:var(--bad)}
.rev-your{color:var(--muted);font-weight:500}
.result-actions{display:flex;gap:14px;justify-content:center;flex-wrap:wrap}

/* prose / about */
.prose h2{margin:26px 0 10px;font-size:1.4rem}
.prose ul,.prose ol{padding-inline-start:24px;margin-bottom:14px}
.prose li{margin-bottom:8px}
.prose ul{list-style:disc}
.prose ol{list-style:decimal}
.prose a{color:var(--primary);font-weight:700}

/* صفحة الخطأ */
.error-page{padding:90px 0}
.error-code{font-size:6rem;font-weight:800;color:var(--primary)}

/* ===== الفوتر ===== */
.site-footer{background:#0f2030;color:#cbd5e1;margin-top:20px}
.footer-inner{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:30px;padding:46px 20px}
.site-footer .brand{color:#fff;margin-bottom:10px}
.footer-col h4{color:#fff;margin-bottom:12px}
.footer-col li{margin-bottom:8px}
.footer-col a:hover{color:var(--primary)}
.footer-bottom{border-top:1px solid rgba(255,255,255,.12);padding:16px 0;text-align:center;font-size:.9rem}

/* ===== المعداد (Soroban) ===== */
.soroban{display:inline-block}
.sb-frame{
  display:flex;flex-direction:row-reverse;gap:0;padding:14px;border-radius:14px;
  background:linear-gradient(180deg,var(--wood),var(--wood-dark));
  border:6px solid var(--wood-dark);box-shadow:var(--shadow-lg);position:relative;
}
.sb-rod{position:relative;width:46px}
.sb-rod::before{content:"";position:absolute;top:6px;bottom:6px;inset-inline-start:50%;transform:translateX(50%);width:4px;background:rgba(0,0,0,.35);border-radius:4px}
.sb-heaven,.sb-earth{position:relative}
.sb-bar{height:8px;background:#2b1a0e;box-shadow:inset 0 1px 0 rgba(255,255,255,.1)}
.sb-bead{
  position:absolute;left:50%;transform:translateX(-50%);
  width:42px;height:22px;border-radius:50%;
  background:radial-gradient(ellipse at 35% 30%,#fbbf24,var(--bead) 60%,#92400e);
  box-shadow:0 2px 4px rgba(0,0,0,.4),inset 0 1px 2px rgba(255,255,255,.4);
  transition:top .14s ease;cursor:pointer;z-index:2;
}
.sb-bead:hover{filter:brightness(1.07)}
.sb-bead.on{background:radial-gradient(ellipse at 35% 30%,#fcd34d,var(--bead-on) 60%,#7c2d12)}
.sb-static .sb-bead{cursor:default}
.sb-digit{position:absolute;bottom:-26px;left:50%;transform:translateX(-50%);color:#ffedd5;font-weight:800;font-size:1rem}
.sb-readout{margin-top:38px;text-align:center;font-weight:700;font-size:1.2rem;color:var(--text)}
.sb-readout-label{color:var(--muted);font-weight:600;font-size:1rem}
.sb-readout-val{color:var(--primary-dark);font-size:1.6rem}

/* ===== استجابة الشاشات ===== */
@media(max-width:820px){
  .nav-toggle{display:flex}
  .main-nav{position:absolute;top:68px;inset-inline-end:0;width:min(300px,80vw);background:#fff;border:1px solid var(--border);border-radius:0 0 0 16px;box-shadow:var(--shadow-lg);flex-direction:column;align-items:stretch;padding:12px;gap:4px;display:none}
  .main-nav.open{display:flex}
  .nav-dropdown{width:100%}
  .nav-drop-btn{width:100%;text-align:start}
  .nav-drop-menu{position:static;display:none;box-shadow:none;border:none;margin:0;padding:0 0 0 8px}
  .nav-dropdown.open .nav-drop-menu{display:flex}
  .hero-grid,.lesson-grid{grid-template-columns:1fr}
  .hero-text h1{font-size:2.1rem}
  .lesson-aside{position:static}
  .footer-inner{grid-template-columns:1fr;gap:24px}
  .question{font-size:2rem}
}
@media(max-width:480px){
  .hero-stats{gap:18px}
  .result-stats{gap:18px}
  .sb-rod{width:38px}
  .sb-bead{width:34px;height:18px}
}