:root {
    --primary: #00d2ff;       /* لون التركواز الأساسي */
    --secondary: #7000ff;     /* لون بنفسجي للتدرجات */
    --bg-dark: #05070a;       /* الخلفية الرئيسية */
    --bg-card: #0d1117;       /* خلفية البطاقات */
    --text-main: #ffffff;
    --text-muted: #8b949e;
    --gradient: linear-gradient(135deg, var(--primary), var(--secondary));
}

* { box-sizing: border-box; margin: 0; padding: 0; outline: none; }
html { scroll-behavior: smooth; }

body {
    font-family: 'Cairo', sans-serif;
    background-color: var(--bg-dark);
    color: var(--text-main);
    overflow-x: hidden;
    line-height: 1.6;
}

/* --- شريط التقدم --- */
#progress-bar {
    position: fixed; top: 0; left: 0; height: 3px;
    background: var(--gradient); z-index: 2000; width: 0%;
    transition: width 0.1s;
}

/* --- الناف بار --- */
header {
    position: fixed; top: 0; width: 100%; z-index: 1000;
    padding: 15px 5%; transition: 0.4s;
    background: rgba(5, 7, 10, 0.8);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(255,255,255,0.05);
}
nav { display: flex; justify-content: space-between; align-items: center; max-width: 1200px; margin: 0 auto; }
.logo { display: flex; align-items: center; gap: 10px; font-weight: 900; color: white; text-decoration: none; font-size: 1.2rem; }
.logo img { width: 40px; border-radius: 8px; border: 2px solid var(--primary); }

.nav-links { display: flex; gap: 25px; list-style: none; }
.nav-links a { color: var(--text-muted); text-decoration: none; font-weight: 700; transition: 0.3s; position: relative; }
.nav-links a:hover, .nav-links a.active { color: var(--primary); }

/* --- الهيرو (الواجهة) --- */
.hero {
    min-height: 100vh; display: flex; align-items: center; justify-content: center;
    text-align: center; padding: 100px 20px;
    background: radial-gradient(circle at top, rgba(0, 210, 255, 0.08), transparent 50%);
}
.badge {
    display: inline-block; background: rgba(0, 210, 255, 0.1); 
    color: var(--primary); padding: 5px 15px; border-radius: 20px; 
    margin-bottom: 20px; font-weight: bold; font-size: 0.9rem;
}
.hero h1 { font-size: clamp(2.5rem, 5vw, 4.5rem); margin-bottom: 10px; font-weight: 900; }
.highlight { background: var(--gradient); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
.typing-wrapper { font-size: 1.5rem; color: var(--primary); height: 40px; margin-bottom: 20px; font-weight: bold; }

.btn {
    padding: 12px 30px; border-radius: 50px; text-decoration: none; font-weight: bold;
    display: inline-flex; align-items: center; gap: 8px; transition: 0.3s; margin: 5px;
}
.btn-primary { background: var(--gradient); color: white; border: none; }
.btn-primary:hover { transform: translateY(-3px); box-shadow: 0 10px 20px rgba(0,210,255,0.3); }
.btn-outline { border: 2px solid var(--primary); color: var(--primary); }
.btn-outline:hover { background: rgba(0,210,255,0.1); }

/* --- الإحصائيات --- */
.stats-container {
    display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 20px; max-width: 900px; margin: -50px auto 80px; padding: 0 20px;
    position: relative; z-index: 2;
}
.stat-box {
    background: var(--bg-card); padding: 20px; border-radius: 15px; text-align: center;
    border: 1px solid rgba(255,255,255,0.05); box-shadow: 0 10px 30px rgba(0,0,0,0.5);
}
.stat-number { font-size: 2.2rem; font-weight: 900; color: var(--primary); display: block; }

/* --- الأقسام العامة --- */
.container { max-width: 1200px; margin: 0 auto; padding: 0 20px 80px; }
.section-title { text-align: center; margin-bottom: 50px; }
.section-title h2 { font-size: 2.5rem; }
.section-title span { color: var(--primary); }

/* --- الخدمات --- */
.services-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 25px; }
.service-card {
    background: var(--bg-card); padding: 30px; border-radius: 20px;
    border: 1px solid rgba(255,255,255,0.05); transition: 0.3s;
}
.service-card:hover { border-color: var(--primary); transform: translateY(-5px); }
.service-card i { font-size: 2.5rem; color: var(--primary); margin-bottom: 20px; }

/* --- فلترة المشاريع --- */
.filter-btns { display: flex; justify-content: center; gap: 15px; margin-bottom: 40px; flex-wrap: wrap; }
.filter-btn {
    background: transparent; border: 1px solid rgba(255,255,255,0.1);
    color: var(--text-muted); padding: 8px 20px; border-radius: 20px; cursor: pointer; transition: 0.3s;
    font-family: 'Cairo', sans-serif;
}
.filter-btn.active, .filter-btn:hover { background: var(--primary); color: var(--bg-dark); border-color: var(--primary); }

/* --- بطاقات المشاريع --- */
.projects-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 30px; }
.project-card {
    background: var(--bg-card); border-radius: 20px; overflow: hidden;
    border: 1px solid rgba(255,255,255,0.05); transition: 0.4s;
}
.project-card:hover { transform: translateY(-10px); border-color: var(--primary); }
.project-img { width: 100%; height: 200px; object-fit: cover; }
.project-info { padding: 25px; }
.tags { display: flex; gap: 8px; margin-bottom: 10px; }
.tag { font-size: 0.75rem; padding: 4px 10px; background: rgba(255,255,255,0.1); border-radius: 10px; }
.btn-link { display: inline-block; color: var(--primary); margin-top: 15px; text-decoration: none; font-weight: bold; }

/* --- يوتيوب --- */
.videos-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 25px; }
.video-card {
    background: var(--bg-card); border-radius: 15px; overflow: hidden; cursor: pointer;
    transition: 0.3s; border: 1px solid rgba(255,255,255,0.05); position: relative;
}
.video-card:hover { transform: scale(1.02); }
.video-thumb { position: relative; padding-top: 56.25%; background: black; }
.video-thumb img { position: absolute; top: 0; left: 0; width: 100%; height: 100%; object-fit: cover; opacity: 0.8; }
.play-icon {
    position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%);
    font-size: 3rem; color: rgba(255,255,255,0.8);
}
.video-info { padding: 15px; }
.video-info h4 { font-size: 1rem; margin-bottom: 5px; line-height: 1.4; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.btn-yt { background: #ff0000; box-shadow: 0 5px 20px rgba(255,0,0,0.3); }

/* --- الفوتر --- */
footer { background: #020305; padding: 60px 20px; text-align: center; border-top: 1px solid rgba(255,255,255,0.05); margin-top: 50px; }
.social-links { display: flex; justify-content: center; gap: 20px; margin: 30px 0; }
.social-links a {
    width: 45px; height: 45px; border-radius: 50%; background: rgba(255,255,255,0.05);
    display: flex; align-items: center; justify-content: center; color: white;
    text-decoration: none; transition: 0.3s; font-size: 1.2rem;
}
.social-links a:hover { background: var(--primary); color: var(--bg-dark); transform: translateY(-5px); }

/* --- زر الصعود للأعلى --- */
#back-to-top {
    position: fixed; bottom: 20px; right: 20px; background: var(--primary);
    color: var(--bg-dark); border: none; width: 40px; height: 40px; border-radius: 50%;
    cursor: pointer; display: none; z-index: 999; font-size: 1.2rem;
}

/* موبايل */
@media (max-width: 768px) {
    .nav-links {
        position: fixed; top: 70px; left: 0; width: 100%; background: var(--bg-card);
        flex-direction: column; padding: 20px; align-items: center; display: none;
        border-bottom: 1px solid var(--primary);
    }
    .nav-links.active { display: flex; }
    .menu-toggle { display: block; font-size: 1.5rem; cursor: pointer; }
}