body {
    background-color: #050810;
    /* Pure CSS Sci-Fi Grid & Glow Background (Không bao giờ lỗi) */
    background-image: 
        radial-gradient(circle at 15% 20%, rgba(0, 229, 255, 0.15), transparent 30%),
        radial-gradient(circle at 85% 80%, rgba(0, 229, 255, 0.1), transparent 30%),
        radial-gradient(circle at 50% 50%, rgba(0, 255, 102, 0.05), transparent 50%),
        linear-gradient(rgba(0, 229, 255, 0.04) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0, 229, 255, 0.04) 1px, transparent 1px);
    background-size: 100% 100%, 100% 100%, 100% 100%, 50px 50px, 50px 50px;
    background-position: center;
    background-attachment: fixed;
}

/* Glass Panel Styling (Liquid Glass) */
.glass-panel {
    background: rgba(16, 25, 40, 0.45);
    -webkit-backdrop-filter: blur(28px) saturate(180%);
    backdrop-filter: blur(28px) saturate(180%);
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-top: 1px solid rgba(255, 255, 255, 0.25);
    border-left: 1px solid rgba(255, 255, 255, 0.25);
    box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.4), inset 0 0 15px rgba(255, 255, 255, 0.05);
    transition: all 0.4s cubic-bezier(0.25, 0.8, 0.25, 1);
}

.glass-panel-container {
    background: rgba(10, 15, 25, 0.5);
    -webkit-backdrop-filter: blur(40px) saturate(200%);
    backdrop-filter: blur(40px) saturate(200%);
    border: 1px solid rgba(255, 255, 255, 0.1);
    box-shadow: 0 20px 50px rgba(0,0,0,0.5), inset 0 0 20px rgba(255,255,255,0.02);
    border-radius: 2rem;
    overflow: hidden;
}

.glass-panel:hover {
    background: rgba(20, 30, 48, 0.55);
    border-color: rgba(0, 242, 254, 0.6);
    box-shadow: 0 15px 35px rgba(0, 242, 254, 0.15), 0 0 20px rgba(0, 242, 254, 0.2), inset 0 0 15px rgba(0, 242, 254, 0.05);
    transform: translateY(-4px);
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 6px;
}

::-webkit-scrollbar-track {
    background: rgba(0, 0, 0, 0.2);
}

::-webkit-scrollbar-thumb {
    background: rgba(0, 242, 254, 0.3);
    border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
    background: rgba(0, 242, 254, 0.6);
}

/* Water drop dots on glass (Optional effect) */
.glass-drop {
    position: absolute;
    border-radius: 50%;
    background: radial-gradient(circle at 30% 30%, rgba(255,255,255,0.8), rgba(255,255,255,0.1) 60%, transparent 80%);
    box-shadow: 0 2px 4px rgba(0,0,0,0.2), inset 0 -2px 4px rgba(0,0,0,0.2);
    pointer-events: none;
    opacity: 0.6;
}

/* Tech Text Shadow */
.text-tech-shadow {
    text-shadow: 0 0 10px rgba(0, 242, 254, 0.3);
}

/* Sidebar link hover effect */
.nav-link {
    transition: all 0.3s ease;
    border-radius: 9999px; /* Pill shape */
}

.nav-link:hover {
    background: rgba(255, 255, 255, 0.05);
    box-shadow: inset 0 0 10px rgba(255, 255, 255, 0.05);
}

.nav-link.active {
    background: rgba(0, 242, 254, 0.1);
    border: 1px solid rgba(0, 242, 254, 0.3);
    box-shadow: 0 0 15px rgba(0, 242, 254, 0.15), inset 0 0 10px rgba(0, 242, 254, 0.1);
    color: #00f2fe;
}

.nav-link.active i {
    color: #00f2fe;
}

/* Hide corner markers for cleaner liquid glass look */
.corner-marker {
    display: none;
}