:root{
  --bg:#f6f8fb; --surface:#ffffff; --text:#14203a; --muted:#5a6b85;
  --primary:#0b5cad; --primary-d:#084a8c; --accent:#0aa06e; --danger:#c62828;
  --border:#e2e8f2; --shadow:0 1px 3px rgba(16,40,80,.08),0 8px 24px rgba(16,40,80,.06);
  --radius:12px; --maxw:1100px;
  font-family:system-ui,"Segoe UI",Tahoma,"Noto Naskh Arabic",sans-serif;
}
@media (prefers-color-scheme:dark){
  :root{--bg:#0d1424;--surface:#161f33;--text:#eaf0fb;--muted:#9db0cf;
    --primary:#4f9be6;--primary-d:#3d84cc;--accent:#2bc98d;--border:#26324a;
    --shadow:0 1px 3px rgba(0,0,0,.4),0 8px 24px rgba(0,0,0,.3);}
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--text);line-height:1.7;font-size:17px}
a{color:var(--primary);text-decoration:none}
a:hover{text-decoration:underline}
h1,h2,h3{line-height:1.3;color:var(--text)}
img{max-width:100%;height:auto;display:block}
.container{max-width:var(--maxw);margin-inline:auto;padding-inline:20px}
.section{padding-block:38px}
.center{text-align:center}
.empty{color:var(--muted);padding:24px;text-align:center}

/* تخطّي إلى المحتوى (WCAG) */
.skip-link{position:absolute;right:-999px;top:8px;background:var(--primary);color:#fff;
  padding:10px 16px;border-radius:8px;z-index:100}
.skip-link:focus{right:8px}
:focus-visible{outline:3px solid var(--accent);outline-offset:2px;border-radius:4px}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;
  clip:rect(0,0,0,0);white-space:nowrap;border:0}

/* الترويسة والتنقّل */
.site-header{background:var(--surface);border-bottom:1px solid var(--border);position:sticky;top:0;z-index:50}
.nav{max-width:var(--maxw);margin-inline:auto;padding:12px 20px;display:flex;align-items:center;
  justify-content:space-between;gap:16px;flex-wrap:wrap}
.brand{font-weight:800;font-size:1.15rem;color:var(--text)}
.nav-links{display:flex;gap:6px;list-style:none;margin:0;padding:0;align-items:center;flex-wrap:wrap}
.nav-links a{padding:8px 12px;border-radius:8px;color:var(--muted);font-weight:600}
.nav-links a:hover{background:var(--bg);text-decoration:none;color:var(--text)}

/* الأزرار */
.btn{display:inline-block;background:var(--primary);color:#fff;padding:11px 20px;border-radius:10px;
  font-weight:700;border:0;cursor:pointer;font-size:1rem;transition:background .15s}
.btn:hover{background:var(--primary-d);text-decoration:none}
.btn-ghost{background:transparent;color:var(--primary);border:1.5px solid var(--primary)}
.btn-block{display:block;width:100%;text-align:center}
.btn-danger{background:var(--danger)}
.btn-sm{display:inline-block;background:var(--bg);color:var(--text);border:1px solid var(--border);
  padding:6px 12px;border-radius:8px;font-weight:600;cursor:pointer;font-size:.9rem}

/* البطل (Hero) */
.hero{background:linear-gradient(135deg,#0b5cad,#0a7a52);color:#fff;padding:64px 20px;text-align:center}
.hero h1{font-size:2.4rem;margin:0 0 12px;color:#fff;text-shadow:0 1px 3px rgba(0,0,0,.25)}
.hero-sub{font-size:1.2rem;max-width:640px;margin:0 auto 22px;text-shadow:0 1px 2px rgba(0,0,0,.28)}
.hero-actions{display:flex;gap:12px;justify-content:center;flex-wrap:wrap}
.hero .btn-ghost{color:#fff;border-color:#fff}

/* الشبكات والبطاقات */
.card-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:20px;margin-top:20px}
.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);
  padding:20px;box-shadow:var(--shadow)}
.card-title{margin:0 0 8px;font-size:1.2rem}
.card-excerpt{color:var(--muted);margin:0 0 12px}
.card-meta{color:var(--muted);font-size:.85rem}
.platform-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:18px;
  list-style:none;padding:0;margin:18px 0 0}
.platform{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);
  padding:22px;text-align:center;box-shadow:var(--shadow)}
.platform-icon{font-size:2.2rem;display:block;margin-bottom:8px}
.platform h2,.platform h3{margin:.2rem 0}
.platform p{color:var(--muted);margin:.4rem 0 0}

/* المقال */
.article{max-width:760px;padding-block:38px}
.article-header h1{font-size:2rem;margin:0 0 8px}
.article-meta{color:var(--muted);margin-bottom:20px}
.article-cover{border-radius:var(--radius);margin-bottom:20px}
.article-body p{margin:0 0 1.1em}

/* البحث */
.search-form{display:flex;gap:10px;align-items:flex-end;flex-wrap:wrap;margin:16px 0 24px}
.search-form label{display:block;font-weight:700;margin-bottom:6px}
.search-form input{padding:11px 14px;border:1.5px solid var(--border);border-radius:10px;
  min-width:280px;background:var(--surface);color:var(--text);font-size:1rem}
.results-count{color:var(--muted)}

/* التذييل */
.site-footer{background:var(--surface);border-top:1px solid var(--border);margin-top:48px;padding:28px 0;color:var(--muted)}
.site-footer .container{display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;align-items:center}
.footer-links{display:flex;gap:16px}

/* النماذج العامة */
.field{margin-bottom:16px}
.field label{display:block;font-weight:700;margin-bottom:6px}
.field input,.field textarea,.field select{width:100%;padding:11px 13px;border:1.5px solid var(--border);
  border-radius:10px;background:var(--surface);color:var(--text);font:inherit}
.field textarea{resize:vertical}
.alert{padding:12px 16px;border-radius:10px;margin-bottom:16px}
.alert-error{background:#fdecea;color:#b71c1c;border:1px solid #f5c6cb}
@media (prefers-color-scheme:dark){.alert-error{background:#3a1414;color:#ffb4ab;border-color:#5a2020}}

/* مساعد الموقع (chat widget) */
.chat-widget{position:fixed;bottom:20px;inset-inline-start:20px;z-index:80}
.chat-fab{background:var(--primary);color:#fff;border:0;border-radius:999px;padding:12px 18px;
  font-weight:700;cursor:pointer;box-shadow:var(--shadow);font-size:1rem}
.chat-fab:hover{background:var(--primary-d)}
.chat-panel{position:absolute;bottom:60px;inset-inline-start:0;width:340px;max-width:calc(100vw - 40px);
  height:440px;max-height:70vh;background:var(--surface);border:1px solid var(--border);
  border-radius:14px;box-shadow:var(--shadow);display:flex;flex-direction:column;overflow:hidden}
.chat-panel[hidden]{display:none}
.chat-head{background:var(--primary);color:#fff;padding:12px 14px;font-weight:700;
  display:flex;justify-content:space-between;align-items:center}
.chat-close{background:none;border:0;color:#fff;font-size:1.1rem;cursor:pointer}
.chat-msgs{flex:1;overflow-y:auto;padding:14px;display:flex;flex-direction:column;gap:10px}
.chat-hint{color:var(--muted);text-align:center;margin:auto 0}
.chat-msg{padding:9px 13px;border-radius:12px;max-width:85%;line-height:1.6;white-space:pre-wrap}
.chat-msg.user{background:var(--primary);color:#fff;align-self:flex-start;border-bottom-right-radius:3px}
.chat-msg.bot{background:var(--bg);color:var(--text);align-self:flex-end;border-bottom-left-radius:3px}
.chat-sources{font-size:.8rem;color:var(--muted);align-self:flex-end;max-width:90%}
.chat-form{display:flex;gap:8px;padding:10px;border-top:1px solid var(--border)}
.chat-input{flex:1;padding:9px 12px;border:1.5px solid var(--border);border-radius:10px;
  background:var(--surface);color:var(--text);font:inherit}
.chat-form button{background:var(--primary);color:#fff;border:0;border-radius:10px;padding:0 16px;cursor:pointer;font-weight:700}

@media (max-width:640px){
  .hero h1{font-size:1.8rem}
  .site-footer .container{flex-direction:column;text-align:center}
}